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An Evaluation of the Use of “Gentan” Probabilities in Forestry Planning
Item type: Journal Article • Journal: South African Forestry Journal • Authors: JohnH. Randall --- Department of Biometry, South Africa Klaus von Gadow --- Department of Forest Science, South AfricaAn evaluation of Suzuki's concept of Gentan probabilities is presented. Model fitting is discussed in some detail. It is shown that the Gentan method is suitable only for forests that are at least close to normality. -
Site Evaluation in Black Wattle with Special Reference to Soil Factors
Item type: Journal Article • Journal: South African Forestry Journal • Authors: A. P.G. Schönau --- Silviculture Section, Institute for Commercial Forestry Research, South Africa W. J.K. Aldworth --- Silviculture Section, Institute for Commercial Forestry Research, South AfricaTogether with climate, soil characteristics are the most important factors affecting tree growth. However, the attempts in many site evaluation studies to establish a direct relationship between soil factors and tree growth have not been very successful, the exception being... -
Long term nitrogen and phosphorus application to veld
Item type: Journal Article • Journal: Journal of the Grassland Society of Southern Africa • Authors: C.H. Donaldson --- , G. Rootman --- , D. Grossman --- Department of Agriculture,The long term effects of a 5N x 3P factorial fertilizer application trial on hay yields, botanical composition and soil properties of veld are presented. Significant increases in hay yields were recorded during most years. There was a strong correlation... -
Remote sensing applications for monitoring rangeland vegetation
Item type: Journal Article • Journal: Journal of the Grassland Society of Southern Africa • Authors: P.T. Tueller --- Department of Range, Wildlife and Forestry, United States of AmericaRemote sensing techniques hold considerable promise for the inventory and monitoring of natural resources on range‐lands. A significant lack of information concerning basic spectral characteristics of range vegetation and soils has resulted in a lack of rangeland applications. To use... -
Soil factors affecting tree growth and root development in a citrus orchard
Item type: Journal Article • Journal: South African Journal of Plant and Soil • Authors: D.J. Nel --- , A. T.P. Bennie --- ,Tree- and root-growth parameters correlated well with a number of soil properties Useful relationships were established between unconfined penetrometer resistance, air capacity (at FWC), tree growth and root development. -
Invloed van nitraat:ammoniumverhoudings op die ontwikkeling van Zea mays L.
Item type: Journal Article • Journal: South African Journal of Plant and Soil • Authors: F.G. Adriaanse --- , Republiek van Suid-Afrika J.J. Human --- Departement Agronomie en Hortologie, Republiek van Suid-AfrikaDie invloed van drie nitraat:ammoniumverhoudings by twee stikstofkonsentrasies op planteienskappe is met blomtyd en na fisiologiese volwassenheid vir suiwerlyne gemeet. 'n Kwartssandkultuur is as groeimedium in 'n glashuis gebruik. Toenemende NH4 +-verhoudings het planthoogtes, blaaroppervlaktes en droëmateriaalproduksie van verskillende plantkomponente... -
Sources of variation in spring wheat (Triticum aestivum L.) cultivars of the Western and Southern Cape. I. Milling and dough development characteristics
Item type: Journal Article • Journal: South African Journal of Plant and Soil • Authors: M.M. Nel --- Department of Agronomy and Pastures, Republic of South Africa G.A. Agenbag --- Department of Agronomy and Pastures, Republic of South Africa J.L. Purchase --- , Republic of South AfricaApproximately 90% of the annual wheat crop produced in the Republic of South Africa is milled into flour for bread-baking purposes. The percentage of flour extracted, as well as the dough development properties, determine the milling and dough mixing characteristics... -
Sources of variation in spring wheat (Triticum aestivum L.) cultivars of the Western and Southern Cape. II. Baking characteristics
Item type: Journal Article • Journal: South African Journal of Plant and Soil • Authors: M.M. Nel --- Department of Agronomy and Pastures, Republic of South Africa G.A. Agenbag --- Department of Agronomy and Pastures, Republic of South Africa J.L. Purchase --- , Republic of South AfricaProtein content and quality determine flour quality, as well as the success of bread-baking. The stability of wheat quality characteristics is of great importance to the milling and baking industry, who have to produce an end product of acceptable and... -
Development and validation of relationships between sunflower seed quality and easily measurable seed characteristics for grading purposes
Item type: Journal Article • Journal: South African Journal of Plant and Soil • Authors: A.A. Nel --- , Republic of South Africa H.L. Loubser --- , Republic of South Africa P.S. Hammes --- Department of Plant Production and Soil Science, Republic of South AfricaSunflower seed delivered by farmers is usually traded without taking seed quality into account, owing to the lack of a quick and inexpensive method for quality assessment at delivery points. Seed quality parameters (oil content, protein content, hullability and amount... -
Frodo and Darius: South African potato cultivars with good processing quality
Item type: Journal Article • Journal: South African Journal of Plant and Soil • Authors: J.M. Steyn --- Department of Plant Production and Soil Science, South Africa E.B. Geremew --- Department of Plant Production and Soil Science, South Africa J.G. Annandale --- Department of Plant Production and Soil Science, South Africa P.J. Steyn --- , South AfricaTwo newly released South African potato cultivars, Frodo and Darius, were compared with two foreign processing cultivars, Pentland Dell and Shepody. The cultivars were grown under sprinkler irrigation and evaluated for external and internal tuber characteristics and processing quality. The... -
Morphological characters and ascorbic acid content of an elite genotype of Corchorus olitorius: the influence of moisture stress
Item type: Journal Article • Journal: South African Journal of Plant and Soil • Authors: AnofiOT Ashafa --- Department of Plant Sciences, South Africa AbidemiA Abass --- Department of Botany, Nigeria Titilola Osinaike --- Department of Botany, Nigeria FrancisB Lewu --- Agriculture Department, South AfricaMoisture stress can be deleterious to physicochemical properties of crop species to a varying degree. The influence of moisture stress on the ascorbic acid content in the leaf and morphological characters of an elite genotype of Corchorus olitorius were tested... -
Effect of shallow tillage and straw mulching on soil water conservation and grapevine response
Item type: Journal Article • Journal: South African Journal of Plant and Soil • Authors: Philip A Myburgh --- ARC–Infruitec/Nietvoorbij, South AfricaEffects of shallow tillage and straw mulch thickness on water conservation and grapevine responses were compared to bare, untilled soil in a Sauvignon blanc/99R vineyard near Stellenbosch from 1995 to 1997. Shallow tillage to a depth of 6 cm did... -
Identification and classification of vertical chlorophyll patterns in the Benguela upwelling system and Angola-Benguela front using an artificial neural network
Item type: Journal Article • Journal: South African Journal of Marine Science • Authors: N. F. Silulwane A. J. Richardson F. A. Shillington B. A. Mitchell-InnesInformation on the vertical chlorophyll structure in the ocean is important for estimating integrated chlorophyll a and primary production from satellite. For this study, vertical chlorophyll profiles from the Benguela upwelling system and the Angola-Benguela front were collected in winter... -
A LIMNOLOGICAL INVESTIGATION OF LAKE LIAMBEZI, CAPRIVI
Item type: Journal Article • Journal: Journal of the Limnological Society of Southern Africa • Authors: M.T. Seaman --- , South Africa W.E. Scott --- , South Africa R.D. Walmsley --- , South Africa B. C.W. van der Waal --- , South Africa D.F. Toerien --- , South AfricaA general investigation was carried out on Lake Liambezi to characterize the limnological features of the lake. The lake, 101 km2 in area and situated within the tropics, was found to be shallow and bordered by reed swamps, particularly on... -
A NOTE ON TRIOPS GRANARIVS (LUCAS), LYNCEUS TRUNCATUS BARNARD AND STREPTOCEPHALUS CAFER (LOVéN) (BRANCHIOPODA: CRUSTACEA) FROM UMFOLOZI GAME RESERVE, NATAL, SOUTH AFRICA
Item type: Journal Article • Journal: Journal of the Limnological Society of Southern Africa • Authors: NancyA. Rayner --- Department of Zoology, South Africa A.E. Bowland --- Department of Zoology, South AfricaThree species of branchiopod (phyllopod) Crustacea were collected from an ephemeral pool in Umfolozi Game Reserve in December 1983 and 1984. There is no published record of the occurrence of Triope granarius (Lucas) and Lynceus truncatus Barnard in Natal. Streptocephalus... -
ENVIRONMENTAL CORRELATES OF PLANT SPECIES DISTRIBUTION ON THE NYL RIVER FLOODPLAIN
Item type: Journal Article • Journal: Southern African Journal of Aquatic Sciences • Authors: M. A.S. Coetzee --- Botany Department, South Africa K.H. Rogers --- Botany Department, South AfricaThe envisaged construction of a dam on a major tributary of the Nyl River will alter the hydrological regime with consequent effects on the structure and functioning of the downstream floodplain ecosystem (Nylsvley). Attempts to minimise this impact will be... -
A CHARACTERIZATION OF SOUTHERN AFRICAN ESTUARINE SYSTEMS
Item type: Journal Article • Journal: Southern African Journal of Aquatic Sciences • Authors: A.K. Whitfield --- , South AfricaModifications to the structure and functioning of southern African estuarine systems can be placed into two major categories; those changes that have been driven by global forces such as climatic and sea-level fluctuations, and those that have resulted from direct... -
Retraction and expansion of flock mobility in Central Asia: costs and consequences
Item type: Journal Article • Journal: African Journal of Range & Forage Science • Authors: Carol Kerven Ilya Ilych Alimaev Roy Behnke Grant Davidson Leen Franchois Nurlan Malmakov Erik Mathijs Aidos Smailov Sayat Temirbekov Iain WrightSeasonal and spatial fluctuations in forage quality, accessibility and output provide strong incentives for migratory stock keeping in Central Asia. Over the past century, mobile livestock husbandry has either been suppressed or collapsed and a fragmented pattern of rangeland use... -
Validation of the Values in Action Inventory of Strengths for Youth (VIA-Youth) Among South African learners
Item type: Journal Article • Journal: Journal of Psychology in Africa • Authors: Chrizanne van Eeden --- North-West University, South Africa Marié P. Wissing --- North-West University, South Africa Jeanette Dreyer --- North-West University, South Africa Nansook Park --- University of Rhode Island, Christopher Peterson --- University of Michigan,This study investigated the reliability and validity of the Values in Action Inventory for Youth (VIA-Youth) of Park and Peterson (2006) in a total multi-cultural group of South African learners aged 13 to 17 years (N=1691: male = 703, female... -
Prevalence of Alcohol Use and Associated Factors in Pregnant Antenatal Care Attendees in Mpumalanga, South Africa
Item type: Journal Article • Journal: Journal of Psychology in Africa • Authors: Julia Louw --- Human Sciences Research Council, South Africa Karl Peltzer --- Human Sciences Research Council, South Africa Gladys Matseke --- Human Sciences Research Council, South AfricaWe sought to identify the prevalence of alcohol use and associated factors among pregnant women who were patients at antenatal primary care clinics in a South Africa health district. A cross-sectional study using systematic sampling was conducted among 1497 pregnant... -
Job Characteristics That Influence the Career Success of Soldiers in the South African National Defence Force: An Analytical Review
Item type: Journal Article • Journal: Journal of Psychology in Africa • Authors: Nondlela Ditsela --- Stellenbosch Univerity, South Africa Gideon Van Dyk --- Stellenbosch Univerity, South AfricaCareer success for solders is influenced by objective and subjective job qualities including their antecedents and mediators. This article considers the objective and subjective indicators of career success in the context of the South African National Defence Force (SANDF): achievement,... -
The Borsuk-Ulam theorem for surfaces
Item type: Journal Article • Journal: Quaestiones Mathematicae • Authors: DacibergL. GonçalvesGiven a pair (S, T) whereS is a closed surface and T is a free Z 2 action on S, we classify which pairs have the property that the Borsuk-Ulam theorem holds with respect to R 2. In particular if... -
Response of mangroves to drought and non-tidal conditions in St Lucia Estuary, South Africa
Item type: Journal Article • Journal: African Journal of Aquatic Science • Authors: SCL Hoppe-Speer --- Botany Department, South Africa JB Adams --- Botany Department, South Africa A Rajkaran --- Botany Department, South AfricaThe effect of a prolonged closed-mouth state on the condition of mangrove habitats was studied in May 2010 at St Lucia Estuary, KwaZulu-Natal. The mouth had been closed to the sea since 2002 as a result of artificial mouth closure... -
Characterisation of potential aquaculture pond effluents, and physico-chemical and microbial assessment of effluent-receiving waters in central Ghana
Item type: Journal Article • Journal: African Journal of Aquatic Science • Authors: YB Ansah --- Department of Fish and Wildlife Conservation, USA EA Frimpong --- Department of Fish and Wildlife Conservation, USA S Amisah --- Department of Fisheries and Watershed Management, GhanaAn understanding of specific aquaculture systems and the impacts of their management practices leads to sound and cost-effective policies to protect the aquatic environment. Water samples were collected in 2009 from fish ponds, streams that receive effluents directly from ponds... -
Nest characteristics of Yellow-billed Kites Milvus aegyptius in the Manambolomaty Lakes Complex, western Madagascar
Item type: Journal Article • Journal: Ostrich: Journal of African Ornithology • Authors: Tolojanahary Andriamalala --- , Madagascar Lily-Arison Rene de Roland --- , Madagascar Marius Rakotondratsima --- , Madagascar Gilbert Razafimanjato --- , Madagascar Russell Thorstrom --- , USAWe studied the nesting biology of Yellow-billed Kites Milvus aegyptius in the Manambolomaty Lakes Complex of western Madagascar during 2002 and 2003. We recorded 64 nesting attempts. In 2003, 33% (n = 39 nests) of the occupied nests were from... -
The life history of the giant octopus Octopus magnificus in South African waters
Item type: Journal Article • Journal: African Journal of Marine Science • Authors: CD Smith JC Groeneveld G MaharajOctopus magnificus is a regular bycatch of traps set for spiny lobsters and bottom trawls for Cape hakes Merluccius spp. on the continental shelf of South Africa. Octopuses were collected from rocky substrata (traps) and soft sediments (research trawls) during... -
Biological characteristics of sardine caught by the beach-seine fishery during the KwaZulu-Natal sardine run
Item type: Journal Article • Journal: African Journal of Marine Science • Authors: CD van der Lingen --- Branch Fisheries, Department of Agriculture, South Africa M Hendricks --- Branch Fisheries, Department of Agriculture, South Africa MD Durholtz --- Branch Fisheries, Department of Agriculture, South Africa G Wessels --- Marine Research Institute and Zoology Department, South Africa C Mtengwane --- Branch Fisheries, Department of Agriculture, South AfricaCatches of sardine Sardinops sagax made by the beach-seine fishery off the KwaZulu-Natal (KZN) coast during the annual winter sardine run have been sampled intermittently since 1951, and a substantial amount of data on various biological characteristics of sardine caught... -
Tree species composition, structure and utilisation in Maruzi Hills Forest Reserve in Uganda
Item type: Journal Article • Journal: Southern Forests: a Journal of Forest Science • Authors: I Kiyingi --- , Uganda JM Kidiya --- , Uganda S Gwali --- , Uganda P Okullo --- , Uganda DM Byabashaija --- , UgandaThe study investigated the tree species composition, vegetation structure and harvesting pattern to guide management of the Maruzi Hills Forest Reserve. Stratified random sampling was used to site six (100 m × 100 m) permanent sample plots in the woodland,... -
Algal communities associated with aquatic macrophytes in some artificial ponds in Nyando District, Kenya
Item type: Journal Article • Journal: African Journal of Aquatic Science • Authors: Balthazar Mpawenayo Christine CocquytThis study describes the algal communities of six ponds colonised by aquatic macrophytes in Nyanza Province, Kenya. Plankton samples were collected from the water column and epiphytic samples from macrophytes such as Azolla, Pistia, Nymphaea, Ipomoea and Ludwigia. Pond pH,... -
Does Serranochromis altus (Teleostei: Cichlidae) exist in the Okavango Delta, Botswana?
Item type: Journal Article • Journal: African Journal of Aquatic Science • Authors: FH van der Bank M Wink M Soekoe N SmitTwo possibly synonymous fish species in the Okavango Delta, Botswana, Serranochromis altus and S. angusticeps, were compared. Ecological data, morphometrics, meristics, allozymes, and genomic fingerprints — generated with six Inter-Simple Sequence Repeat (ISSR) analyses, and DNA barcoding primers — were... -
Comparative growth performance of different Australian provenances and local land races of Grevillea robusta at Lushoto and Ubiri in the West Usambara Mountains, Tanzania
Item type: Journal Article • Journal: Southern Forests: a Journal of Forest Science • Authors: LM Madadi --- Lushoto Silviculture Research Centre, Tanzania SC Mathias --- Lushoto Silviculture Research Centre, Tanzania WA Mugasha --- , Tanzania L Nshubemuki --- , Tanzania ST Mwihomeke --- Department of Forestry, South AfricaGrowth of seven Grevillea robusta provenances from its natural habitat in northern New South Wales and southern Queensland, Australia, and five local land races were studied at two trial sites established in November 1998 at Lushoto and Ubiri in the... -
Breeding ecology of the Chestnut-backed Sparrowlark Eremopterix leucotis in an agroecosystem in the Limpopo province, South Africa
Item type: Journal Article • Journal: Ostrich: Journal of African Ornithology • Authors: Derek Engelbrecht --- Department of Biodiversity, South Africa Lucket Dikgale --- Department of Biodiversity, South AfricaWe studied the breeding ecology of the Chestnut-backed Sparrowlark Eremopterix leucotis over three years between 2008 and 2010. The breeding season was bimodal with a main peak in laying in autumn (March–April) and another smaller peak in spring (September–October). Nest... -
Who are good home-based care volunteers?
Item type: Journal Article • Journal: South African Family Practice • Authors: G Marincowitz --- Department of Family Medicine and Primary Care, Limpopo Province Unit, C Jackson --- CHoiCe (NGO doing home-based care in the Tzaneen municipal area), GS Fehrsen --- Department of Family Medicine,Aim The aim of the study was to describe the characteristics of volunteers who remained active in the home-based care project located in Tzaneen (Limpopo Province) and thereby assist the project leaders to improve the recruitment and quality of the... -
Prevalence of chronic pain in patients attending primary healthcare facilities in south-west Tshwane
Item type: Journal Article • Journal: South African Family Practice • Authors: WN Rauf --- Department of Family Medicine, HP Meyer --- Department of Family Medicine, TS Marcus --- Department of Family Medicine, PJ Becker --- Biostatistics Unit,Objectives: Despite the significant biopsychosocial impact of chronic pain on the health and quality of life of an individual, as well as on healthcare utilisation, no published data are available on the prevalence of chronic pain in the South African... -
Sociodemographic and clinical profiles of suicidal patients requiring admission to hospitals south of Durban
Item type: Journal Article • Journal: South African Family Practice • Authors: SS Naidoo --- Department of Family Medicine, L Schlebusch --- Department of Behavioural Medicine,Background: Suicidal behaviour has become a major public health concern worldwide. Non-fatal suicidal attempts outnumber fatal episodes by wide-ranging figures across, and within, many countries. Approximately 6 500 suicides and 130 000 suicide attempts occur annually in South Africa, with... -
Aspects of the breeding ecology of the Purple Swamphen Porphyrio porphyrio in the wetland complex of Guerbes-Sanhadja, north-east Algeria
Item type: Journal Article • Journal: Ostrich: Journal of African Ornithology • Authors: Bara Mouslim --- Laboratoire Ecologie des Systèmes terrestres et aquatiques, Algeria Merzoug Seyf Eddine --- Laboratoire Biologie, Eau et Environnement, Algeria Khelifa Rassim --- Laboratoire Biologie, Eau et Environnement, Algeria Bouslama Zihad --- Laboratoire Ecologie des Systèmes terrestres et aquatiques, Algeria Houhamdi Moussa --- Laboratoire Biologie, Eau et Environnement, AlgeriaThe Purple Swamphen Porphyrio porphyrio is a common rail that previously was little investigated in North Africa. From 2011 to 2013, its breeding ecology was studied at two natural wetlands in north-east Algeria, namely Garaet Hadj Tahar and Garaet Messaoussa... -
The hybrid mean value of L-functions and a special character sums
Item type: Journal Article • Journal: Quaestiones Mathematicae • Authors: Jianghua Li --- College of Science, P.R. China Xinqiang Qin --- College of Science, P.R. China Fang Zhang --- College of Science, P.R. ChinaThe main purpose of this paper is using the estimation of the character sums to study the 2k-th power mean of L-functions with the weight of a character sums, and give an interesting asymptotic formula for it. -
Waterfowl abundance and diversity in relation to season, wetland characteristics and land-use in semi-arid South Africa
Item type: Journal Article • Journal: African Zoology • Authors: Ashley A. Raeside --- Department of Biology, Canada Scott A. Petrie --- Long Point Waterfowl and Wetlands Research Fund, Bird Studies Canada, Canada Thomas D. Nudds --- Department of Integrative Biology, Ecology Group, CanadaWe studied waterfowl abundance and diversity in relation to season (wet vs dry), wetland characteristics (vegetation and morphometrics) and land-use in a semi-arid agricultural region of South Africa to determine how waterfowl respond to various wetland characteristics, particularly those of... -
Breeding ecology of the pink-billed lark, Spizocorys conirostris, in an agricultural landscape in South Africa
Item type: Journal Article • Journal: African Zoology • Authors: D. Engelbrecht --- Department of Biodiversity, South Africa M.H.T. Mathonsi --- Department of Biodiversity, South AfricaWe studied the breeding ecology, parental care and nesting success of the pink-billed lark, Spizocorys conirostris, in an agricultural landscape in the Limpopo Province of South Africa, from October 2008 to October 2010. The results are compared with data in... -
Characteristics of agriculture technology and application of an agricultural innovation system in Tanzania
Item type: Journal Article • Journal: African Journal of Science, Technology, Innovation and Development • Authors: Athman H. Mgumia --- Tanzania Commission for Science and Technology (COSTECH), Dar es Salaam, Tanzania Amon Z. Mattee --- Department of Agricultural Education and Extension, Tanzania Beatus A.T Kundi --- Department of Mechanical & Industrial Engineering, College of Engineering & Technology (COeT), TanzaniaThe globalisation of the world economy and advancements in science, including the use of biotechnology for agricultural production has subjected agricultural technologies to market forces for their generation and dissemination. It is evident, however, that while some technologies are more... -
Characteristics of companies with a higher risk of financial statement fraud: A survey of the literature
Item type: Journal Article • Journal: South African Journal of Accounting Research • Authors: E. du Toit --- Department of Financial Management,Fraud and corruption in companies is a serious problem in this day and age. One only needs to think of Enron, Parmalat and Macmed. Companies are constantly identifying new and ingenious ways to defraud their customers, investors, the government and... -
On pricing kernels, information and risk
Item type: Journal Article • Journal: Investment Analysts Journal • Authors: Diane L. Wilcox --- School of Computational & Applied Mathematics, South Africa Tim J. Gebbie --- School of Computational & Applied Mathematics, South AfricaThis paper compares out-of-sample, ex-ante risk and returns of arbitrage pricing theory (APT) risk-factor based, zero-cost portfolios with characteristic-based, zero-cost portfolios. In particular the Haugen and Baker characteristic-based model framework is used in a comparison with the capital asset pricing... -
Fund manager characteristics and performance
Item type: Journal Article • Journal: Investment Analysts Journal • Authors: Yi Fang --- Center for Quantitative Economics, China Haiping Wang --- School of Administrative Studies, CanadaThis study establishes a multitier framework to evaluate how fund manager characteristics systematically affect mutual fund performance. The framework includes three tiers of performance elements: comprehensive performance; return and risk; and timing skill and picking ability. Using performance decomposition, our... -
Connecting entrepreneurship and education
Item type: Journal Article • Journal: • Authors: Sjoerd A. Gehrels --- Stenden Academy of International Hospitality Research, Leeuwarden, The NetherlandsThe aim of this research is to explore the contextual characteristics of a particular group of Dutch restaurant owners, the successful culinary entrepreneurs (SCEs), to examine how these contextual characteristics might be used in a hospitality education. This very small segment of... -
Performance and design optimisation of an apparatus for distilling palm wine (Elaeis guineensis) by controlling thermal operations
Item type: Journal Article • Journal: African Journal of Science, Technology, Innovation and Development • Authors: Clément Ahouannou --- Laboratory of Applied Mechanics and Energy, Polytechnic School of Abomey-Calavi, Benin Fidèle Tchobo --- Laboratory Study and Research in Applied Chemistry, Polytechnic School of Abomey-Calavi, Benin Emile A. Sanya --- Laboratory of Applied Mechanics and Energy, Polytechnic School of Abomey-Calavi, Benin Christa Lokossou --- Laboratory Study and Research in Applied Chemistry, Polytechnic School of Abomey-Calavi, Benin Mohamed Soumanou --- Laboratory Study and Research in Applied Chemistry, Polytechnic School of Abomey-Calavi, BeninMastery of thermal control in the craft distillation processing operations of fermented wine from Elaeis guineensis is needed to improve and enhance the resulting Beninese alcoholic drink, sodabi. In this study, craft distillation of palm-wines from three municipalities of southern... -
Temporal distribution of baseline characteristics and association with early mortality among HIV-positive patients at University College Hospital, Ibadan, Nigeria
Item type: Journal Article • Journal: African Journal of AIDS Research • Authors: Joshua.O. Akinyemi --- Department of Epidemiology and Medical Statistics, College of Medicine, Nigeria Olubukola A. Adesina --- Department of Obstetrics and Gynaecology, College of Medicine, Nigeria Modupe.O. Kuti --- Department of Chemical Pathology, College of Medicine, Nigeria Babatunde.O. Ogunbosi --- Department of Paediatrics, College of Medicine, Nigeria Achiaka E. Irabor --- Department of Family Medicine, University College Hospital, Ibadan, Nigeria Georgina N. Odaibo --- Department of Virology, College of Medicine, Nigeria David O. Olaleye --- Department of Virology, College of Medicine, Nigeria Isaac F. Adewole --- Department of Obstetrics and Gynaecology, College of Medicine, NigeriaThe first six months of HIV care and treatment are very important for long-term outcome. Early mortality (within 6 months of care initiation) undermines care and treatment goals. This study assessed the temporal distribution in baseline characteristics and early mortality... -
Exploring communication channels used by festival visitors: Traditional channels versus the Internet
Item type: Journal Article • Journal: African Journal of Science, Technology, Innovation and Development • Authors: A. van Lille --- Business Management, South Africa J.W. Strydom --- Business Management, South AfricaVarious communication channels are available to festival managers to present messages to specific target markets. Today's festival visitors live in the Information Age, and have become mostly unresponsive to traditional communication methods. Therefore this research investigated the communication channels used... -
Skull morphometrics of male Subantarctic fur seals (Arctocephalus tropicalis) from Marion and Gough Islands
Item type: Journal Article • Journal: African Zoology • Authors: Graham I.H. Kerley --- Zoology Department, South Africa Bryce R. Allen --- Zoology Department, South Africa Marthán N. Bester --- Department of Zoology and Entomology, South AfricaSkull morphometrics of two populations of Subantarctic fur seal (Arctocephalus tropicalis) were compared in order to identify possible geographic variation as an indicator of gene flow between the populations, as well as a potential tool to identify the source of... -
Using Rasch modelling to examine the international personality item pool (IPIP) values in action (VIA) measure of character strengths
Item type: Journal Article • Journal: Journal of Psychology in Africa • Authors: Graham A. du Plessis --- Department of Psychology, South Africa Gideon P. de Bruin --- Department of Psychology, South AfricaThis paper investigates the psychometric properties of the values in action (VIA) character strengths (Peterson and Seligman, 2004). A sample of 904 South African undergraduate students (female=77%, male=23%, black=70%, mean age=21.07 years, SD age=2.73 years) was assessed using a 380-item... -
Classification of unregulated landfills by waste stream analysis method, a case of Chief Albert Luthuli Municipality, South Africa
Item type: Journal Article • Journal: African Journal of Science, Technology, Innovation and Development • Authors: Fannie Machete --- Department of Environmental Health, South Africa Karabo Shale --- Department of Environmental Health, South AfricaThe characterisation of unregulated landfills as general landfills is misleading particularly because these landfills are used to dispose of a mixed stream of general and hazardous waste. Unregulated landfills are unlicensed on-land waste disposal facilities that are not designed, constructed... -
Subtidal macrozoobenthic community resilience to change following natural mouth breaching of the temporarily open/closed East Kleinemonde Estuary, South Africa
Item type: Journal Article • Journal: African Journal of Aquatic Science • Authors: TH Wooldridge --- Department of Zoology, South Africa K Bezuidenhout --- Department of Zoology, South AfricaThe East Kleinemonde Estuary, on the south-east coast of South Africa, typically opens for only short periods, usually <10 days. During a nine-month study in 2006, marine influence persisted for a near-continuous period of three months. This provided an opportunity... -
Distribution and ecological risks of polychlorinated biphenyls (PCBs) in surface sediment of the Forcados River, Niger Delta, Nigeria
Item type: Journal Article • Journal: African Journal of Aquatic Science • Authors: CMA Iwegbue --- Department of Chemistry, NigeriaConcentrations of Σ15 PCBs in sediments of the Forcados River, Nigeria, were determined in 2012 to provide information on the profile, sources and ecotoxicological risks of PCBs in the sediment. The screening concentrations of PCBs were quantified using a gas... -
On character amenability of semigroup algebras
Item type: Journal Article • Journal: Quaestiones Mathematicae • Authors: S.M. Maepa --- , , South Africa O.T. Mewomo --- , , South AfricaWe study the character amenability of semigroup algebras. We work on general semigroups and certain semigroups such as inverse semigroups with a finite number of idempotents, inverse semigroups with uniformly locally finite idempotent set, Brandt and Rees semigroup and study... -
Work engagement in the mining industry in South Africa: The role of tasks and relationships
Item type: Journal Article • Journal: Journal of Psychology in Africa • Authors: Joe Palo --- Optentia Research Focus Area, South Africa Sebastiaan Rothmann --- Optentia Research Focus Area, South AfricaThe platinum mining sector in South Africa presents a significant context for the study of work engagement, given the major changes and turmoil experienced by employees in this sector. The aim of this study was to investigate the effects of... -
Connecting entrepreneurship and education
Item type: Journal Article • Journal: Research in Hospitality Management • Authors: Sjoerd A. Gehrels --- Stenden Academy of International Hospitality Research, The NetherlandsThe aim of this research is to explore the contextual characteristics of a particular group of Dutch restaurant owners, the successful culinary entrepreneurs (SCEs), to examine how these contextual characteristics might be used in a hospitality education. This very small... -
Investor sentiment, asset returns and firm characteristics: Evidence from the Korean Stock Market
Item type: Journal Article • Journal: Investment Analysts Journal • Authors: Heejin Yang --- College of Economics, Republic of Korea Doojin Ryu --- College of Economics, Republic of Korea Doowon Ryu --- College of Economics, Republic of KoreaThis study investigates the effects of investor sentiment on asset returns with respect to firm characteristics. By analysing a unique stock trading dataset of the Korean Stock Market that contains rich information on investor types and sentiment, we confirm that... -
Evaluation of the sustainability of participatory management of forest plantations: the case study of Wari-Maro Forest Reserve, Republic of Benin
Item type: Journal Article • Journal: Southern Forests: a Journal of Forest Science • Authors: Kisito Gandji --- Laboratory of Biomathematics and Forest Estimations, Faculty of Agronomic Sciences, Republic of Benin Valère K Salako --- Laboratory of Biomathematics and Forest Estimations, Faculty of Agronomic Sciences, Republic of Benin Achille E Assogbadjo --- Laboratory of Biomathematics and Forest Estimations, Faculty of Agronomic Sciences, Republic of Benin Vincent OA Orekan --- Laboratory of Biogeography and Environmental Expertise, Faculty of Letters, Arts and Human Sciences, Republic of Benin Romain L Glèlè Kakaï --- Laboratory of Biomathematics and Forest Estimations, Faculty of Agronomic Sciences, Republic of Benin Brice A Sinsin --- Laboratory of Applied Ecology, Faculty of Agronomic Sciences, Republic of BeninThis study assessed ecological and socio-economic impacts of a participatory forest management project in the Republic of Benin. The study focused on the Wari-Maro Forest Reserve and the ‘Projet d’Aménagement des Massifs Forestiers’ five years after its completion. A forest... -
Determination of energy efficiency for water heating in eight South African hotels
Item type: Journal Article • Journal: African Journal of Science, Technology, Innovation and Development • Authors: Fannie Machete --- Waste for Development, Natural Resources and the Environment, South Africa Oyewale Mayowa Morakinyo --- Department of Environmental Health Sciences, Faculty of Public Health, NigeriaThis study presents a characterization framework for energy efficient hotels. It builds on existing frameworks of energy efficiency and the adopted characterization framework advances from the input-output framework. The theoretical framework was developed through an in-depth literature analysis. In contrast... -
Characterisation of pigeon pea (Cajanus cajan) landraces grown in two climatic zones in KwaZulu-Natal province, South Africa
Item type: Journal Article • Journal: South African Journal of Plant and Soil • Authors: Lindah L Hluyako --- Discipline of Crop Science, School of Agricultural, Earth and Environmental Sciences, South Africa Alfred O Odindo --- Discipline of Crop Science, School of Agricultural, Earth and Environmental Sciences, South Africa Paramu Mafongoya --- Discipline of Crop Science, School of Agricultural, Earth and Environmental Sciences, South Africa Nkanyiso J Sithole --- Discipline of Crop Science, School of Agricultural, Earth and Environmental Sciences, South Africa Lembe S Magwaza --- Discipline of Crop Science, School of Agricultural, Earth and Environmental Sciences, South AfricaPigeon pea is an important legume in arid and semi-arid areas of the Sub-Saharan Africa. Knowledge of adaptation characteristics of genotypes would significantly enhance its production in diverse environments of the region. Field experiments were conducted at two sites, namely... -
All drag, all the time — one night in Cape Town with Lola Fine
Item type: Journal Article • Journal: Anthropology Southern Africa • Authors: Lindy-Lee Prince --- Institute for Humanities in Africa, South AfricaThis photo essay discusses the ways in which a participant in a research project on the performance of gender embodies and becomes a performance character, as well as the different instantiations this takes in different contexts and situations. The photo... -
Redescription and molecular characterisation of the fish parasitic isopod Norileca indica (Milne Edwards, 1840) (Crustacea: Isopoda: Cymothoidae) with a key to the genus
Item type: Journal Article • Journal: African Zoology • Authors: Serita van der Wal --- Water Research Group, Unit for Environmental Sciences and Management, Potchefstroom Campus, South Africa Nico J Smit --- Water Research Group, Unit for Environmental Sciences and Management, Potchefstroom Campus, South Africa Kerry A Hadfield --- Water Research Group, Unit for Environmental Sciences and Management, Potchefstroom Campus, South AfricaNorileca indica (Milne Edwards, 1840) is fully redescribed based on ovigerous females collected from Maputo Bay, Mozambique, from the branchial cavity of the fish host Selar crumenophthalmus Bloch, 1793. An identification key to the species of Norileca Bruce, 1990 is... -
Game fence presence and permeability influences the local movement and distribution of South African mammals
Item type: Journal Article • Journal: African Zoology • Authors: Tara J Pirie --- People and Wildlife Research Group, School of Biological Sciences, UK Rebecca L Thomas --- People and Wildlife Research Group, School of Biological Sciences, UK Mark DE Fellowes --- People and Wildlife Research Group, School of Biological Sciences, UKFences are utilised throughout the world to restrict the movements of wildlife, protecting them from threats and reducing human–wildlife conflict. In South Africa the number of privately-owned fenced game reserves has greatly increased in recent years, but little is known... -
Habitat characteristics of wintering Wood Warbler Phylloscopus sibilatrix in the Centre Region of Cameroon: conservation implications
Item type: Journal Article • Journal: Ostrich: Journal of African Ornithology • Authors: Taku Awa --- Laboratory of Applied Biology and Ecology, Faculty of Science, Cameroon Tsi A Evaristus --- Department of Fundamental Science, Higher Technical Teacher Training College, Cameroon Robin C Whytock --- School of Biological and Environmental Sciences, UK Tsetagho Guilain --- Laboratory of Applied Biology and Ecology, Faculty of Science, Cameroon John Mallord --- Centre for Conservation Science, Royal Society for the Protection of Birds, UKPopulations of many Afro-Palearctic birds have declined, with those wintering in sub-Saharan Africa, such as Wood Warbler Phylloscopus sibilatrix, particularly affected. In this study we investigated the relationship between habitat characteristics and Wood Warbler presence/absence in the Centre Region of... -
Nest-site characteristics and aspects of the breeding biology of the endangered Timneh Parrot Psittacus timneh in Guinea-Bissau
Item type: Journal Article • Journal: Ostrich: Journal of African Ornithology • Authors: Daniel C Lopes --- Faculty of Sciences, Portugal Rowan O Martin --- World Parrot Trust, UK Mohamed Henriques --- MARE – Marine and Environmental Sciences Centre, Portugal Hamilton Monteiro --- Coastal Planning Office, Guinea-Bissau Aissa Regalla --- Institute of Biodiversity and Protected Areas, Guinea-Bissau Quintino Tchantchalam --- Institute of Biodiversity and Protected Areas, Guinea-Bissau Bucar Indjai --- INEP – National Institute for Study and Research, Guinea-Bissau Seco Cardoso --- Institute of Biodiversity and Protected Areas, Guinea-Bissau Celestino Manuel --- Institute of Biodiversity and Protected Areas, Guinea-Bissau Manjaco Cunha --- Institute of Biodiversity and Protected Areas, Guinea-Bissau Domingos Cunha --- Institute of Biodiversity and Protected Areas, Guinea-Bissau Paulo Catry --- MARE – Marine and Environmental Sciences Centre, PortugalTimneh Parrots Psittacus timneh are endemic to the moist forests of West Africa. Concerns over rapid declines in populations due to overharvesting for the pet trade and forest loss prompted the species’ categorisation as Endangered on the IUCN Red List... -
Jail duration, demographic characteristics of offenders, and acquired suicide capability
Item type: Journal Article • Journal: Journal of Psychology in Africa • Authors: Ajiboye Isaac Oyeleke1 --- Department of Social Work / Social Development, South Africa Pius TangweTanga --- Department of Social Work / Social Development, South Africa Ajibola Abdulrahamon Ishola --- Department of Psychology, NigeriaThe study sought to predict the acquired capability for suicide from length of sentence and socio-demographic characteristics of offenders in a Nigerian prison population. Participants were 139 inmates (mean age = 33.67, SD = 9.24years; mean length of stay = 6.25 years, SD = 5.02years), males (95.7%), They... -
Soul searching on the wings of my wheels: Motorcyclists’ happiness
Item type: Journal Article • Journal: Journal of Psychology in Africa • Authors: Stefan Kruger --- WorkWell Research Unit, South AfricaThis study aimed to investigate how personal characteristics of motorcyclists influenced their affect and sense of happiness with their motorcycles. Data on personal characteristics, motorcycle characteristics, feelings about owning a motorcycle, discreet emotions, and overall happiness were collected from 367... -
Chemical characteristics of woods from several Chilean native forest species and their relationship with nanomechanical cell properties
Item type: Journal Article • Journal: Southern Forests: a Journal of Forest Science • Authors: María Graciela Aguayo --- Centro de Biomateriales y Nanotecnología, Chile William Gacitúa --- Centro de Biomateriales y Nanotecnología, Chile Paulina Valenzuela --- Centro de Biomateriales y Nanotecnología, Chile Regis Teixeira Mendonça --- Laboratorio de Recursos Renovables, Centro de Biotecnología, Chile Pablo Reyes --- Centro de Excelencia en Nanotecnología, Fundación Leitat Chile, ChileThe objective of this research was to study the chemical and nanomechanical characteristics of native woods grown in southern Chile region. The species analysed were Drimys winteri, Laureliopsis philippiana, Aextoxicon puctatum, Nothofagus alpina, Nothofagus dombeyi, Laurelia sempervirens, Austrocedrus chilensis and... -
Long-term physico-chemical and faunal changes in a small, rural South African estuary
Item type: Journal Article • Journal: African Zoology • Authors: M Kajee --- Department of Biological Sciences and Centre for Invasion Biology, South Africa CL Griffiths --- Department of Biological Sciences and Centre for Invasion Biology, South Africa SJ Lamberth --- Fisheries Management, Department of Agriculture, South AfricaThe Palmiet Estuary is a small, rural estuary in the Western Cape that only closes briefly during dry summers. The system was previously surveyed during 1979 to 1980 and we repeated the survey in April 2015 (mouth closed) and September... -
HIV prevalence and related behaviours of older people in Botswana — secondary analysis of the Botswana AIDS Impact Survey (BAIS) IV
Item type: Journal Article • Journal: African Journal of AIDS Research • Authors: Kabo Matlho --- School of Public Health, Australia Madeleine Randell --- School of Public Health, Australia Refelwetswe Lebelonyane --- Ministry of Health, Botswana Joseph Kefas --- National AIDS Coordinating Agency, Botswana Tim Driscoll --- School of Public Health, Australia Joel Negin --- School of Public Health, AustraliaThe focus of HIV interventions in Botswana, a country with the second highest prevalence of HIV in the world, remains targeted at those aged 15–49 years despite a growing cohort of older people living with the disease — driven largely... -
Seasonal occurrence and ecological aspects of Afrodiplozoon polycotyleus (Monogenea: Diplozoidae) from the gills of three cyprinids from the Nwanedi-Luphephe dams, South Africa
Item type: Journal Article • Journal: African Journal of Aquatic Science • Authors: EM Mbokane --- Aquaculture Research and Development, South Africa J Theron --- Aquaculture Research Unit, University of Limpopo, South Africa WJ Luus-Powell --- Department of Biodiversity, South AfricaThe effect of seasonal changes and ecological aspects of Afrodiplozoon polycotyleus (Paperna, 1973) collected on Labeobarbus marequensis (Smith, 1841), Enteromius trimaculatus (Peters, 1852) and Enteromius radiatus (Peters, 1853) was investigated from January to October 2008. Fish were collected at the... -
Determination of Factors Influencing Cultivation and Utilisation of Pumpkins Among Smallholders in Kakamega and Nyeri Counties, Kenya
Item type: Journal Article • Journal: East African Agricultural and Forestry Journal • Authors: J.K. Kiramana --- Chuka University, Kenya D.K. Isutsa --- Egerton University, KenyaPumpkin is becoming an important fruit-vegetable, although its potential remains unexploited in Kenya. This study aimed at enhancing conservation, preservation and production of naturalized pumpkins through the cataloguing of accessions and documentation of indigenous traditional knowledge influencing cultivation and utilization... -
Seasonal variation of livestock feed resources in semi-arid and humid environments of Rwanda
Item type: Journal Article • Journal: East African Agricultural and Forestry Journal • Authors: Mupenzi Mutimura --- University of KwaZulu-Natal, South Africa Cyprian Ebong --- Rwanda Agriculture Board (RAB), Rwanda Idupulapati M Rao --- International Centre for Tropical Agriculture (CIAT), Colombia Ignatius V Nsahlai --- University of KwaZulu-Natal, South AfricaIn most of sub-Saharan African countries, including Rwanda, the predominant agricultural production is from a mixed-crop-livestock farming system, because of small size land holding. The objective of this study was to assess the seasonal availability of livestock feed resources in... -
Taxonomic challenges associated with identification guides of benthic macroinvertebrates for biomonitoring freshwater bodies in East Africa: A review
Item type: Journal Article • Journal: African Journal of Aquatic Science • Authors: H Ochieng --- Department of Biology, Uganda J Okot-Okumu --- Department of Environmental Management, Uganda R Odong --- Department of Zoology, Entomology and Fisheries Sciences, UgandaAlthough biomonitoring of freshwater bodies is important in East Africa as a result of increasing environmental threats, the identification guides of benthic macroinvertebrates used to generate data for developing metrics for this purpose are mainly not regionally specific. This casts... -
Oxygen and temperature influence the distribution of deepwater Cape hake Merluccius paradoxus in the southern Benguela: a GAM analysis of a 10-year time-series
Item type: Journal Article • Journal: African Journal of Marine Science • Authors: FL Mbatha --- Department of Biological Sciences and Marine Research Institute, South Africa D Yemane --- Department of Biological Sciences and Marine Research Institute, South Africa M Ostrowski --- Institute of Marine Research (IMR), Norway CL Moloney --- Department of Biological Sciences and Marine Research Institute, South Africa MR Lipiński --- Department of Ichthyology and Fisheries Science, South AfricaGeneralised additive models (GAMs) were applied to survey data to assess the influence of dissolved oxygen, water temperature and year of sampling upon the presence/absence of small (≤15 cm TL), medium (16–34 cm TL) and large (≥35 cm TL) size... -
Optimising the dosage of ethyl methanesulphonate mutagenesis in selected wheat genotypes
Item type: Journal Article • Journal: South African Journal of Plant and Soil • Authors: Boluwatife M Olaolorun --- School of Agricultural, Earth and Environmental Sciences, South Africa Hussein A Shimelis --- School of Agricultural, Earth and Environmental Sciences, South Africa Isack Mathew --- School of Agricultural, Earth and Environmental Sciences, South Africa Mark D Laing --- School of Agricultural, Earth and Environmental Sciences, South AfricaNarrow genetic variation limits the success of crop improvement programs. Mutagenesis using ethyl methane- sulphonate (EMS) provides an opportunity to increase genetic variation to enhance selection in wheat improvement. This study aimed at establishing the optimum dosage and treatment conditions... -
Roseate Terns Sterna dougallii on the southeast coast of South Africa: information on moult and migratory status
Item type: Journal Article • Journal: Ostrich: Journal of African Ornithology • Authors: Anthony J Tree --- Port Alfred, South Africa Maëlle Connan --- Department of Zoology, Marine Apex Predator Research Unit, Institute for Coastal and Marine Research, South Africa Philip A Whittington --- Department of Zoology, South AfricaDetermining the migratory status of seabird populations is crucial for addressing conservation concerns. The Roseate Tern Sterna dougallii is considered endangered in South Africa in view of its small breeding population and the threats to eggs and chicks. Earlier works... -
Maternal HIV status disclosure to young uninfected children: psychological variables of the mother
Item type: Journal Article • Journal: African Journal of AIDS Research • Authors: Maretha Visser --- Department of Psychology, South Africa Amukelani Jennifer Hlungwani --- Department of Psychology, South AfricaMothers living with HIV are faced with the dilemma of when and how to disclose their HIV-positive status to their young uninfected children. In this study, a South African sample of mothers living with HIV, with young uninfected children (6–10... -
Carbon stock in the community managed Sal (Shorea robusta) forests of Dadeldhura district, western Nepal
Item type: Journal Article • Journal: Southern Forests: a Journal of Forest Science • Authors: Suresh Prashad Bhatta --- , Nepal Anjana Devkota --- , NepalFour community-managed Sal forests in Dadeldhura district of Nepal were selected for the assessment of carbon stock. The stratified random sampling method was applied to measure the field data from 105 sample plots of 100 m2. The carbon stock of... -
Large characteristic subgroups and abstract group classes
Item type: Journal Article • Journal: Quaestiones Mathematicae • Authors: Francesco de Giovanni --- , Italy Marco Trombetti --- , ItalyIt is well-known that every virtually abelian group contains an abelian characteristic subgroup of finite index. We shall say that a group class is F-characteristic if any group containing an -subgroup of finite index has also a characteristic subgroup of... -
Utilization of collapsible fish tank innovation among homestead fish farmers in Osun State, Nigeria
Item type: Journal Article • Journal: African Journal of Science, Technology, Innovation and Development • Authors: Idris Olabode Badiru --- , Nigeria Theophilus Opeyemi Amure --- , NigeriaThis study ascertained the utilization of collapsible fish tanks among homestead fish farmers in Osun State of Nigeria. A structured questionnaire was used to elicit data on fish farmers’ awareness, disposition, influencing/limiting factors and utilization of the fish tank innovation... -
Regression plateau for plot size estimation with ‘Gigante’ forage cactus pear
Item type: Journal Article • Journal: South African Journal of Plant and Soil • Authors: Bruno Vinícius Castro Guimarães --- , Brazil Sérgio Luiz Rodrigues Donato --- , Brazil Ignacio Aspiazú --- , Brazil Alcinei Místico Azevedo --- , Brazil Abner José de Carvalho --- , Brazil‘Gigante’ cactus pear (Opuntia ficus indica Mill. cv. Gigante) is a forage crop grown under semi-arid climates and because of its’ resilience to water-limiting conditions it can produce a high biomass yield. The objective of this study was to estimate... -
The distribution of dinoflagellate cyst assemblages in recent sediments of the Oualidia Lagoon, Morocco, with a focus on toxic species
Item type: Journal Article • Journal: African Journal of Marine Science • Authors: K Chaira --- , Morocco H Rhinane --- , Morocco B Ennaffah --- , Morocco S Maimouni --- , Morocco R Sagou --- , Morocco S Loulad --- , Morocco A BenMhamed --- , Morocco A Agouzouk --- , Morocco S BenBrahim --- , Morocco E Masseret --- , France M Laabir --- , FranceHarmful algal blooms (HABs) are becoming widely distributed and more frequent, threatening socioecosystems and human health. We determined species composition, abundance and spatial distribution of dinoflagellate cysts in the upper sediment of the Oualidia Lagoon located on the Atlantic coast... -
Structure, growth and growing space efficiency of Pinus radiata (D. Don) trees as affected by their social position
Item type: Journal Article • Journal: Southern Forests: a Journal of Forest Science • Authors: Hans Pretzsch --- , Germany Andreas Rais --- , Germany Deon Malherbe --- , South Africa Antonio Ruano --- , Spain Hugo Lambrechts --- , The Netherlands Enno Uhl --- , Germany Ben du Toit --- , South AfricaCurrently, silvicultural prescriptions such as thinning monospecific stands from above and transitioning from monospecific to mixed-species stands are scrutinised regarding their ability to reduce stress and damage. That the quantity and quality of the trees harvested by intermediate and final... -
Diffusion of innovations: Theoretical perspectives and empirical evidence
Item type: Journal Article • Journal: African Journal of Science, Technology, Innovation and Development • Authors: Bibhunandini Das --- , IndiaThis paper attempts to review the theoretical and empirical perspectives of innovation-diffusion literature. The objective of this paper is to develop a heuristic framework by reviewing the existing studies for analyzing the diffusion of innovation and its outcome in different... -
Technological characterisation of wood from Australian red cedar after first thinning of a plantation at five years
Item type: Journal Article • Journal: Southern Forests: a Journal of Forest Science • Authors: Kelvin Techera Barbosa --- , Brazil Andrey Pereira Acosta --- , Brazil Marília Lazarotto --- , Brazil Rafael Beltrame --- , Brazil Claudia Fernanda Lemons e Silva --- , Brazil Claudimar Sidnei Fior --- , BrazilAustralian red cedar (Toona ciliata M. Roem.) is a forest species planted in Brazil especially for lumber production. This study aimed to evaluate technological properties of the wood after selective first thinning of a plantation 5 years after planting. The... -
Agro-morphological diversity of Bambara groundnut lines evaluated under field conditions
Item type: Journal Article • Journal: South African Journal of Plant and Soil • Authors: Nokuthula Hlanga --- , South Africa Albert Modi --- , South Africa Isack Mathew --- , South AfricaAssessing agro-morphological variation is important for crop improvement strategies in cultivated species. Bambara groundnut (Vigna subterranea (L.) Verdc.) is a neglected crop that requires extensive agro-morphological characterisation to design suitable agronomic and crop improvement strategies. Nineteen Bambara groundnut lines were... -
Assessment of rice threshing technology characteristics for enhanced rice sector development in Senegal
Item type: Journal Article • Journal: African Journal of Science, Technology, Innovation and Development • Authors: Philomena Chioma-Akalugo Ogwuike --- Federal University of Agriculture Abeokuta, Nigeria Aminou Arouna --- Africa Rice Center (AfricaRice), Cote d’Ivoire Clinton Obinna Ogwuike --- Centre for the Study of the Economies of Africa (CSEA), NigeriaUnderstanding the technology characteristics desirable to farmers to increase the adoption of improved technologies remains a high-priority research issue in sub-Saharan Africa (SSA). The study aimed to quantify farmers’ demand and assessment of the characteristics of rice threshing technologies to... -
Nearly para-Kähler geometry on Lie groups
Item type: Journal Article • Journal: Quaestiones Mathematicae • Authors: Leila Nourmohammadifar --- Arak University, Iran Esmaeil Peyghan --- Arak University, IranIn this paper, we introduce left-invariant (strict) nearly para-Kaähler structures on Lie groups (nearly para-Kähler Lie algebras) and present some properties of them. We prove the existence of a unique connection in terms of the characteristic connection on these Lie... -
Patterns of fish distribution in tropical rock pools at Príncipe Island, Gulf of Guinea
Item type: Journal Article • Journal: African Journal of Marine Science • Authors: J Azevedo e Silva --- University of Lisbon, Portugal AJ Almeida --- University of Lisbon, Portugal M Cravo --- University of Lisbon, Portugal MP Pais --- University of Lisbon, Portugal Y Santos --- , São Tomé e Príncipe J Paula --- University of Lisbon, PortugalLittle is known about the ichthyofauna from intertidal rock pools of the west coast of Africa, especially in the Gulf of Guinea. Rock pools are characteristic habitats of the intertidal zone of structurally complex rocky shores, adding important niche space... -
Notes on normal p-complements and monomial characters
Item type: Journal Article • Journal: Quaestiones Mathematicae • Authors: Xiaoyou Chen --- University of Technology, China Yong Yang --- Texas State University, USALet G be a finite group and Irr(G) be the set of irreducible (complex) characters of G. Let χ ∈ Irr(G) and write cod(χ) = |G : ker χ|/χ(1) as the codegree of χ, where ker χ is the kernel... -
Towards a natural classification of African toads (Anura, Bufonidae): Past progress and future prospects
Item type: Journal Article • Journal: The Journal of the Herpetological Association of Africa • Authors: BarryT. Clarke --- The Natural History Museum, EnglandAfrican bufonid toads (especially members of the genus Bufo) are a relatively uniform group morphologically, but beneath this apparent uniformity lies a higher level of diversity in habits and lifestyle than is initially evident. Members of the group exhibit considerable... -
A new species of hemidactylus (Squamata: Gekkonidae) from West Africa, and comments on species hitherto confused with H. Muriceus
Item type: Journal Article • Journal: The Journal of the Herpetological Association of Africa • Authors: Klaus Henle --- Umweltforschungszentrum Leipzig‐Halle GmbH, Germany Wolfgang Böhme --- Zoologisches Forschungsinstitut und Museum Alexander Koenig, GermanyWe describe a new species of Hemidactylus, H. pseudomuriceus. It is very similar to H. muriceus but differs in the number of internasal granules and has a central row of enlarged instead of narrow subcaudal scales. The new species lives... -
Population structure of the African Clawed Frog (Xenopus laevis) in maize‐growing areas with atrazine application versus non‐maize‐growing areas in South Africa
Item type: Journal Article • Journal: African Journal of Herpetology • Authors: LouisH. Du Preez --- North‐West University, South Africa KeithR. Solomon --- University of Guelph, Canada JimA. Carr --- Texas Tech University, JohnP. Giesy --- Michigan State University, USA TimothyS. Gross --- Florida Caribbean Science Center‐USGS‐BRD, USA RonaldJ. Kendall --- Texas Tech University, USA ErnestE. Smith --- Texas Tech University, USA GlenL. Van der Kraak --- University of Guelph, Canada Ché Weldon --- North‐West University, South AfricaThe herbicide atrazine has been suggested to cause gonadal deformities in frogs and could possibly impact on reproduction. Since the early 1960s, atrazine has been used in large amounts in maize production areas of South Africa. These areas overlap with... -
A comparison of the water quality and plankton diversity of the Okamini Stream to the freshwater systems within the New Calabar River catchment, Port Harcourt, Nigeria
Item type: Journal Article • Journal: African Journal of Aquatic Science • Authors: BB Otene --- Rivers State University, Nigeria I Thornhill --- University of Manchester, United Kingdom J Amadi --- Rivers State University, NigeriaThe water quality and phytoplankton diversity of the Okamini Stream, Port Harcourt, Nigeria was studied between April and June 2018 at three stations. The data was used to assess the health of the system for supporting local communities. Compared to... -
Who does better on life satisfaction and meaning in life? A Mixed-methods exploration of demographic characteristics and well-being in Ghana
Item type: Journal Article • Journal: Journal of Psychology in Africa • Authors: Angelina Wilson Fadiji --- University of Pretoria, South Africa Shingairai Chigeza --- University of Pretoria, South Africa Bontle Kgopa --- University of Pretoria, South AfricaThe present study examined the relationship between the demographic characteristics of age, sex, religious practice, and standard of living with life satisfaction and meaning in life in a Ghanaian setting. Participants were 394 Ghanaian urban adults (female = 43.90; mean... -
On G-character tables for normal subgroups
Item type: Journal Article • Journal: Quaestiones Mathematicae • Authors: M.J. Felipe --- Instituto Universitario de Matemática Pura y Aplicada (IUMPA-UPV), Universitat Politècnica de València, Spain M.D. Pérez-Ramos --- Universitat de València, Spain V. Sotomayor --- Instituto Universitario de Matemática Pura y Aplicada (IUMPA-UPV), Universitat Politècnica de València, SpainLet N be a normal subgroup of a finite group G. From a result due to Brauer, it can be derived that the character table of G contains square submatrices which are induced by the G-conjugacy classes of elements in... -
Some further remarks on characterized subgroups generated by modular simple density
Item type: Journal Article • Journal: Quaestiones Mathematicae • Authors: Ayan Ghosh --- Jadavpur University, IndiaIn this short note we have constructed an uncountable tower of characterized subgroups using the notion of modular simple density [8] which subsequently gives the solution of Problem 2.15 [7] in a more general setting. -
A generalization of Taketa’s theorem on M-groups
Item type: Journal Article • Journal: Quaestiones Mathematicae • Authors: Zeinab Akhlaghi --- Amirkabir University of Technology (Tehran Polytechnic), IranLet G be a finite group. We prove the solvability of G, by assuming that the average degree of non-monomial irreducible characters in Irr(G) is less than 5/2. The bound is sharp. -
Equivalent version of Huppert’s conjecture for codegrees of K 3-groups
Item type: Journal Article • Journal: Quaestiones Mathematicae • Authors: Mohsen Ghasemi --- Urmia University, Iran Somayeh Hekmatara --- Urmia University, IranFor a character χ of a finite group G the number cod(χ) = |G: Ker(χ)|/χ(1) is called the codegree of χ. In this note, we verify the equivalent version of Huppert’s conjecture for K 3 -groups. -
On the monoid algebra associated to the monomial characters of a finite group
Item type: Journal Article • Journal: Quaestiones Mathematicae • Authors: Mircea Cimpoeaş --- University Politehnica of Bucharest, Romania Alexandru Florin Radu --- University Politehnica of Bucharest, RomaniaGiven a finite group G, we study the monoid algebra RG , over a field K , generated by the monomial characters of G. In particular, we note that the integral closure of RG is contained in the algebra generated... -
Analysing the socioeconomic characteristics of fisheries-dependent communities in the context of the blue economy in Ghana
Item type: Journal Article • Journal: African Journal of Science, Technology, Innovation and Development • Authors: Alhassan Abdul-Wakeel Karakara --- University of Cape Coast, Ghana James Atta Peprah --- University of Cape Coast, Ghana Isaac Dasmani --- University of Cape Coast, GhanaFor centuries resource economists have persistently debated and discussed the potential of the green economy and how it should be protected and used sustainably. Most studies to date on the economic value of natural resources have thus concentrated on the... -
Genetic variability of Tachigali vulgaris trees based on seed morphophysiological traits
Item type: Journal Article • Journal: Southern Forests: a Journal of Forest Science • Authors: Noemi Vianna Martins Leão --- , Brazil Sérgio Heitor Sousa Felipe --- Universidade Estadual do Maranhão, Brazil Ricardo Gallo --- Universidade Federal Rural de Pernambuco, Brazil Elizabeth Santos Cordeiro Shimizu --- , BrazilTachigali vulgaris is a tree with high potential for energy purposes in Brazil. However, there is little information about genetic variability that can be applied to plant breeding. Here, we quantified genetic variability based on biometric and emergence traits of... -
Distribution, habitat and vulnerability to climate change of the Endangered Leptopelis xenodactylus
Item type: Journal Article • Journal: African Journal of Herpetology • Authors: Kirsty J. Kyle --- North-West University, South Africa Louis H. Du Preez --- North-West University, South Africa James Harvey --- 41 Devonshire Avenue, South Africa Adrian J. Armstrong --- Centre for Functional Biodiversity, School of Life Sciences, University of KwaZulu-Natal, South AfricaLeptopelis xenodactylus is a little-known, Endangered species of frog that is thought to be endemic to the KwaZulu-Natal Province of South Africa. In an effort to determine the distribution of this species more accurately, a working species distribution model was... -
Discrete selectivity, shrinking properties, and disjoint local π-bases
Item type: Journal Article • Journal: Quaestiones Mathematicae • Authors: Gary Gruenhage --- Auburn University, U.S.A Vladimir V. Tkachuk --- Universidad Autónoma Metropolitana, MexicoUsing binary function spaces, we give an example of a pseudocompact discretely selective topological group. We show that, under PFA, every compact space of countable tightness has a countable disjoint local π-base at every point. If X is a compact... -
The impact of printing industry effluent on the growth and antioxidant response of the freshwater green microalga Chlorella sorokiniana
Item type: Journal Article • Journal: African Journal of Aquatic Science • Authors: IY Okpanachi --- Nigerian Army University Biu, Nigeria U Aminu --- Ahmadu Bello University, Nigeria AO Jolaoso --- University of Lagos, Nigeria WN Yusufu --- Ahmadu Bello University, Nigeria E Abdulmalik --- Ahmadu Bello University, Nigeria MA Chia --- Ahmadu Bello University, NigeriaContamination of aquatic ecosystems with printing industry wastewater is a serious concern because of the toxicity associated with the effluent components and a tendency to create cascading ecological effects. The influence of printing-press effluent on the freshwater microalga Chlorella sorokiniana... -
Characterizing some finite groups by the average order
Item type: Journal Article • Journal: Quaestiones Mathematicae • Authors: Z. Akhlaghi --- Amirkabir University of Technology (Tehran Polytechnic), Iran Behrooz Khosravi --- Amirkabir University of Technology (Tehran Polytechnic), Iran Ashkan ZareZadeh --- Amirkabir University of Technology (Tehran Polytechnic), IranThe average order of a finite group G is denoted by o(G). In this note, we classify groups whose average orders are less than o(S 4), where S 4 is the symmetric group on four elements. Moreover, we prove that... -
Do changes in star selection criteria affect analyst behaviour?
Item type: Journal Article • Journal: Investment Analysts Journal • Authors: Karam Kim --- Sungkyunkwan University, Republic of Korea Doojin Ryu --- Sungkyunkwan University, Republic of Korea Jinyoung Yu --- Xi'an Jiaotong-Liverpool University, ChinaThis study examines whether the star analyst selection criteria affect analysts’ coverage decisions and the informativeness of their reports. We focus on a change to the star evaluation criteria that increased the importance of quantitative standards. After the reform, analysts... -
Performance of some quinoa (Chenopodium quinoa Willd.) genotypes in Kenya
Item type: Journal Article • Journal: South African Journal of Plant and Soil • Authors: M.E. Oyoo --- Kenya Agricultural Research Institute (KARI), Food Crops Section, Kenya S.M. Githiri --- University of Nairobi, Department of Plant Science and Crop Protection, Kenya P.O. Ayiecho --- University of Nairobi, Department of Plant Science and Crop Protection, KenyaQuinoa (Chenopdium quinoa Willd.) has been cultivated for thousands of years in South America for its nutritious grain and leaves. Demand for the crop has risen in the recent past. In order to satisfy the demand, there is need to... -
Breeding ecology of the Madagascar Grebe Tachybaptus pelzelnii in Bemanevika Protected Area in the northern highlands of Madagascar
Item type: Journal Article • Journal: Ostrich: Journal of African Ornithology • Authors: Delphin Rasolonjatovo --- The Peregrine Fund Madagascar Project, Madagascar Lily-Arison Rene De Roland --- The Peregrine Fund Madagascar Project, Madagascar Tolojanahary Andriamalala --- The Peregrine Fund Madagascar Project, Madagascar Marius Rakotondratsima --- The Peregrine Fund Madagascar Project, Madagascar Séraphin Fabrice --- The Peregrine Fund Madagascar Project, Madagascar Stéphanie Razakaratrimo --- The Peregrine Fund Madagascar Project, Madagascar Yverlin ZM Pruvot --- The Peregrine Fund Madagascar Project, Madagascar Russell Thorstrom --- The Peregrine Fund, United StatesWe studied the breeding ecology of the endangered Madagascar Grebe Tachybaptus pelzelnii (family Podicipedidae) at Bemanevika Protected Area, during two consecutive years (October 2020–September 2022). Two breeding units were observed: pairs and trios made up of one male and two... -
Quality characteristics of forage in the sowing year of a standard perennial pasture established with annual ryegrass, barley, and berseem clover as companion crops
Item type: Journal Article • Journal: African Journal of Range & Forage Science • Authors: Hasan Beytullah Dönmez --- Çukurova University, Turkey Rustu Hatipoglu --- Kırşehir Ahi Evran University, TurkeyThis study was conducted to determine the effect of different seed sowing rates (25%, 50%, 75%, 100% of the recommended pure stand of the species) and harvesting stages (early harvest, late harvest) of annual ryegrass, barley, and berseem clover used... -
Characterisation of women through actions in a Tshivenḓa drama Ḽa ḓa hafha ḽi a kovhela by NE Sigogo: the contemporary democratic era
Item type: Journal Article • Journal: South African Journal of African Languages • Authors: Mmbulaheni Lawrence Mudau --- University of South Africa (UNISA), South AfricaCharacters’ actions often reveal their true nature more accurately than their words or beliefs. Authors use character actions to depict personality traits, physical appearance and relationships in literary works, employing indirect characterisation. This article aims to explore how character actions... -
Management entrenchment: Determinants and impact on firm performance of French listed companies
Item type: Journal Article • Journal: South African Journal of Accounting Research • Authors: Mounir Jaouadi --- Arab Open University, Kingdom of Saudi Arabia Amira Feidi --- University of Tunis El-Manar, Tunisia -
A characterization of some finite quasisimple groups using their character codegrees
Item type: Journal Article • Journal: Quaestiones Mathematicae • Authors: Lehlogonolo S. Mabena --- University of Pretoria, South Africa Sesuai Y. Madanha --- University of Pretoria, South Africa Bernardo G. Rodrigues --- University of Pretoria, South AfricaLet G be a finite group. For an irreducible character χ of G, define its codegree by cod(χ) = |G : ker χ|/χ(1). Furthermore, define cod(G) = {cod(χ) : χ ∈ Irr(G)}. A recent conjecture of Hung and Moretó states... -
Ukuhlaziywa kwamasiko nokubunjwa kwabalingiswa besifazane ngendlela engaqondile emdlalweni kaMavundla othi Unyaka Wesethembiso 2012
Item type: Journal Article • Journal: South African Journal of African Languages • Authors: Noluthando Zwane --- School of Education, South Africa Themba Madingiza --- University of Johannesburg, South AfricaLolu cwaningo lucubungula amasiko kanye nokuvezwa kwabalingiswa besifazane ngendlela engaqondile emdlalweni othi, Unyaka Wesithembiso oshicelelwe uMavundla ngowezi-2012. Kulolu cwaningo kusetshenziswa injulalwazi yefemenizimu lapho kubhekwa okulandelayo ngabalingiswa besimame abakhethiwe: izingubo zokugqoka, inkulumo, ukucabanga, kanye nezenzo. Ucwaningo luhlose ukuqhathanisa abesifazane abavela ezindaweni...