Search
Search results for
We found
38 results for you
-
Suitability of two types of plastic covering on mini-tunnels for paprika seedling production in warm areas
Item type: Journal Article • Journal: South African Journal of Plant and Soil • Authors: J. Allemann --- , Republic of South Africa J. Viljoen --- , Republic of South Africa J.G. Niederwieser --- , Republic of South AfricaA trial was conducted at the ARC-Roodeplaat Vegetable and Ornamental Plant Institute to determine the difference between the two types of plastic (clear and opaque) used as covering for mini-tunnels during paprika (Capsicum anuum L.) seedling production. Two cultivars (PapriKing... -
Honeybush (Cyclopia spp.) response to phosphorus fertilisation and mulching
Item type: Journal Article • Journal: South African Journal of Plant and Soil • Authors: M.E. Joubert --- , South Africa P.S. Botma --- , South Africa W. A.G. Kotzé --- , South Africa J. Wooldridge --- , South AfricaHoneybush (Cyclopia spp.) is endemic to the Western- and Eastern Cape where it grows naturally in sandy, acidic, low- phosphorus (P) soils. The effects of different rates of applied P, and of mulches, on the growth of four honeybush species... -
The effect of defoliation environment on primary growth allocation and secondary tiller recruitment of two bunchgrasses
Item type: Journal Article • Journal: African Journal of Range & Forage Science • Authors: KW Tomlinson TG O'ConnorCompositional shifts of bunchgrass species in the Southern Tall Grassveld in response to different combinations of non-selective mowing and burning appear to reflect differences in growth strategy among species, but there are few studies of South African grasses designed to... -
Coarse root–shoot allometry of Pinus radiata modified by site conditions in the Western Cape province of South Africa
Item type: Journal Article • Journal: Southern Forests: a Journal of Forest Science • Authors: H Pretzsch --- Chair for Forest Growth and Yield, Germany P Biber --- Chair for Forest Growth and Yield, Germany E Uhl --- Chair for Forest Growth and Yield, Germany P Hense --- Chair for Forest Growth and Yield, GermanyThe relationship between root and shoot growth and how it is modified by chronic or episodic drought stress is so far not well understood. Allometric partitioning theory (APT) supposes a constant root–shoot allometry. Optimal partitioning theory (OPT) assumes that plants’... -
Effects of irregular stand structure on tree growth, crown extension and branchiness of plantation-grown Pinus patula
Item type: Journal Article • Journal: Southern Forests: a Journal of Forest Science • Authors: Simon A Ackerman --- Department of Forest and Wood Science, South Africa Pierre A Ackerman --- Department of Forest and Wood Science, South Africa Thomas Seifert --- Department of Forest and Wood Science, South AfricaThe practice of combining row and selective thinning in commercial pine plantation silviculture carries the risk of unwanted irregularities in tree distribution, a situation that is aggravated when tree selection during marking is poor. The potential consequences of poor tree... -
Abundance, composition and distribution of solid wastes in the Tanzanian waters of Lake Victoria
Item type: Journal Article • Journal: African Journal of Aquatic Science • Authors: GW Ngupula --- Tanzania Fisheries Research Institute (TAFIRI), Tanzania RJ Kayanda --- Tanzania Fisheries Research Institute (TAFIRI), Tanzania CA Mashafi --- Tanzania Fisheries Research Institute (TAFIRI), TanzaniaThe abundance, composition and distribution of solid waste in the Tanzanian waters of Lake Victoria were quantified during surveys in May and October 2013 at 68 stations in six depth strata using the bottom trawl swept area method. By weight,... -
Computerised inventory management for a manufacturing industry: A case study in Nigeria
Item type: Journal Article • Journal: African Journal of Science, Technology, Innovation and Development • Authors: Emmanuel Seye Owoeye --- Mechanical Engineering Department, Nigeria Samuel Babatope Adejuyigbe --- Mechanical Engineering Department, Nigeria Bukola Olalekan Bolaji --- Mechanical Engineering Department, Nigeria A.F. Adekoya --- Computer Science Department, NigeriaVarious authors have suggested that the cost of purchasing and holding inventory can account for as much as 60%–80% of the total cost of a product or service. Usually, only some of the inventory (about 10%) contributes to 70%–80% of... -
Anaesthesia and the developing brain
Item type: Journal Article • Journal: Southern African Journal of Anaesthesia and Analgesia • Authors: Jansie Prozesky --- Department of Pediatric Anesthesia, USAIncreasing concern about the effect of anaesthesia on the infant and young child is being raised by healthcare practitioners, as well as the public. Immature neurons exposed to anaesthesia may lead to apoptosis and long-term neurobehavioural deficits in animals. The... -
Culture environment and hatchery of origin influence growth, condition and feeding organ morphology in the Pacific oyster Crassostrea gigas in South Africa
Item type: Journal Article • Journal: African Journal of Marine Science • Authors: A Nel --- Department of Botany and Zoology, South Africa G Pitcher --- Branch: Fisheries Management, Department of Agriculture, Forestry and Fisheries, South Africa NB Richoux --- Department of Zoology and Entomology, South Africa S Jackson --- Department of Botany and Zoology, South AfricaSouth Africa lacks a commercial oyster hatchery. To inform the sourcing of seed for future hatchery establishments, we compared half-sib Pacific oyster Crassostrea gigas cohorts from hatcheries in Namibia and Chile. We measured oyster growth, mortality, condition and feeding organ... -
Do dwarf chameleons (Bradypodion) show developmental plasticity?
Item type: Journal Article • Journal: African Zoology • Authors: Ashadee K. Miller --- School of Animal, Plant and Environmental Sciences, University of the Witwatersrand, South Africa Graham J. Alexander --- School of Animal, Plant and Environmental Sciences, University of the Witwatersrand, South AfricaDevelopmental plasticity results from environmental influences on the phenotype of an organism during its development, and its effects are irreversible. The phenomenon of phenotype–genotype uncoupling (plasticity) causes problems in species delineations, and has been suggested as a cause underlying a... -
Morphometric variation in the Tunisian green frog, Rana saharica Anura: Ranidae)
Item type: Journal Article • Journal: African Zoology • Authors: Nabil Amor --- Research Unit: Genetics, Biodiversity and Bio-Resources Development, Biotechnology Institute of Monastir, Tunisia Sarra Farjallah --- Research Unit: Genetics, Biodiversity and Bio-Resources Development, Biotechnology Institute of Monastir, Tunisia Khaled Said --- Research Unit: Genetics, Biodiversity and Bio-Resources Development, Biotechnology Institute of Monastir, TunisiaRana saharica is the most widely distributed anuran in Tunisia. We examined morphological variation in 124 specimens as a function of their geographical origin, using univariate and multivariate statistics with traditional morphometrics. Our results supported the existence of three morphotypes... -
Adaptations to life on arid islands of South Africa: renal performance and phenotypic plasticity in the European rabbit Oryctolagus cuniculus
Item type: Journal Article • Journal: African Zoology • Authors: Gareth J. Tate --- Department of Biological Sciences, South Africa Heather G. Marco --- Department of Biological Sciences, South AfricaMorphological parameters of the mammalian kidney can provide information on the extent to which an animal is able to regulate water relations within its body and cope with arid conditions. Certain groups of mammals, such as rabbits and hares, show... -
Glaring invisibility: dressing the body of the female cleaner
Item type: Journal Article • Journal: Anthropology Southern Africa • Authors: Maheshvari Naidu --- School of Anthropology, Gender and Historical Studies, University of KwaZulu Natal,The paper explores how the uniform of a group of female cleaners appears to be more than an abstract object framed by the practical exegetics of work. The uniform is seen as acting as a material exercise of discretionary and... -
Kelp gulls prey on the eyes of juvenile Cape fur seals in Namibia
Item type: Journal Article • Journal: African Journal of Marine Science • Authors: AJ Gallagher --- Leonard and Jayne Abess Center for Ecosystem Science and Policy, USA ER Staaterman --- Rosenstiel School of Marine and Atmospheric Sciences, USA N Dreyer --- Sandwich Harbour 4×4, NamibiaThe kelp gull Larus dominicanus is an abundant and highly successful avian predator and scavenger that breeds along the coastline in the Southern Hemisphere, ranging from Antarctica to the tropics. On account of its dietary breadth, wide-ranging foraging strategies, and... -
A metastatic unclassified trophoblastic tumour with spontaneous bilateral pneumothoraces
Item type: Journal Article • Journal: Southern African Journal of Gynaecological Oncology • Authors: P Barnardt --- Department of Medical Imaging and Clinical Oncology, L Fourie --- Department of Medical Imaging and Clinical Oncology,Gestational trophoblastic disease (GTD) is a spectrum of diseases associated with pregnancy. Epithelioid trophoblastic tumour (ETT) is a rare neoplastic proliferation of the intermediate trophoblast that can be distinguished from choriocarcinoma. A 35-year-old female presented with persistent vaginal bleeding, raised... -
Chronic inflammatory demyelinating polyneuropathy, diagnosed as a paraneoplastic manifestation of small cell neuroendocrine carcinoma of the cervix
Item type: Journal Article • Journal: Southern African Journal of Gynaecological Oncology • Authors: B Chakrabarti --- Department of Radiotherapy, India S Roy --- Department of Radiotherapy, India C Mallik --- Department of Radiotherapy, India K S Bhattacharya --- Department of Radiotherapy, India S Mukherjee --- Department of Radiotherapy, IndiaParaneoplastic syndrome frequently presents before cancer is diagnosed and can be associated with neoplastic disease that is not yet radiographically detectable. We report on the case of a 35-year-old woman who presented at the neurology department with complaints of insidious... -
Plastic ingestion by estuarine mullet Mugil cephalus (Mugilidae) in an urban harbour, KwaZulu-Natal, South Africa
Item type: Journal Article • Journal: African Journal of Marine Science • Authors: T Naidoo --- School of Life Sciences, South Africa AJ Smit --- Department of Biodiversity and Conservation Biology, South Africa D Glassom --- School of Life Sciences, South AfricaCoastal urban environments have high plastic pollution levels, and hence interactions between plastic debris and marine life are frequent. We report on plastic ingestion by mullet Mugil cephalus in Durban Harbour, KwaZulu-Natal, South Africa. Of 70 mullet (13.0–19.5 cm total length),... -
Presence of microplastics in the tube structure of the reef-building polychaete Gunnarea gaimardi (Quatrefages 1848)
Item type: Journal Article • Journal: African Journal of Marine Science • Authors: HA Nel --- Department of Zoology and Entomology, South Africa PW Froneman --- Department of Zoology and Entomology, South AfricaThe prevalence of microplastics in the marine environment has resulted in a need to understand their association with various fauna. The aim of this study was to assess whether microplastic particles are present in the tube structure of the indigenous... -
The use of granulated plastic waste in structural concrete
Item type: Journal Article • Journal: African Journal of Science, Technology, Innovation and Development • Authors: J. O. Akinyele --- Department of Civil Engineering, Nigeria A. Ajede --- Department of Civil Engineering, NigeriaThis work looked at the ways in which waste plastic can be effectively recycled as an alternative material in concrete production. The granulated plastic waste was used to partially replace fine aggregate (quarry dust) at 0, 5, 10, 15, and... -
Weed density and biomass are reduced and plant growth and seed yield increased in common bean after solarisation with clear and black plastic
Item type: Journal Article • Journal: South African Journal of Plant and Soil • Authors: Elizabeth Ngadze --- Department of Crop Science, Zimbabwe Arnold B Mashingaidze --- Department of Crop Science, Zimbabwe Julia Sibiya --- Department of Crop Science, ZimbabweCommon bean is highly sensitive to early weed competition, which severely reduces growth and yield. An experiment was carried out in Zimbabwe in the 2002/03 and 2003/04 seasons to assess the effectiveness of solarisation in controlling weeds in beans. Four... -
The effect of crushed plastics waste on the structural properties of sandcrete blocks
Item type: Journal Article • Journal: African Journal of Science, Technology, Innovation and Development • Authors: J. O. Akinyele --- Department of Civil Engineering, Nigeria I. O. Toriola --- Department of Civil Engineering, NigeriaThe need for proper disposal of plastic waste has prompted researchers to consider the best way of recycling this non-biodegradable material. This research has looked into the production of sandcrete blocks, using shredded waste plastic in replacing fine aggregate at... -
Progress research on earth construction: Cast earth with glass wastes, cement kiln bypass dust and activated clay
Item type: Journal Article • Journal: African Journal of Science, Technology, Innovation and Development • Authors: Hanaa Youssef Ghorab --- Chemistry Department, Faculty of Science, Egypt Amr Said Meawad --- Chemistry Department, Faculty of Science, Egypt Mehmet Yildirim --- Customer Support Department, Suez Cement Company, Egypt Ahmed Hassan Eied Hassan --- Chemistry Department, Faculty of Science, EgyptA sandy soil was stabilized by 10% CEM I 42.5 R. Up to 50% of the cement was replaced by waste glass powder, cement kiln bypass dust or activated clay. Polynapthalene sulfonate superplasticizer was used to increase the fluidity of... -
Preliminary mineralogical and geotechnical characteristics of Zogbodomey clays in the coastal sedimentary basin of Benin (West Africa)
Item type: Journal Article • Journal: African Journal of Science, Technology, Innovation and Development • Authors: Sémondji Salvien Pyrrhus Agbon --- Département des Sciences de la Terre, Bénin Nelly Carine Kelome --- Département des Sciences de la Terre, Bénin Luc Adissin Glodji --- Département des Sciences de la Terre, BéninThe Benin coastal sedimentary basin is filled with deposits of clays of diverse nature. This study focused on the characteristics of clayey materials of Zogbodomey in sight of their valorization in the construction and ceramics sectors. The clay deposit is... -
Midgut neuroendocrine tumour presenting as orbital metastases
Item type: Journal Article • Journal: Journal of Endocrinology, Metabolism and Diabetes of South Africa • Authors: Helen Hoenck --- , South Africa Wilhelmina Conradie --- , South Africa Magda Conradie --- , South Africa Ankia Coetzee --- , South AfricaMetastasis of a neuroendocrine tumour (NET) to the orbit is a rare occurrence, with published data limited to a few case reports. Orbital involvement usually presents with proptosis and decreased ocular mobility. Timing, in relation to the presentation of the... -
Anatomical, physiological and allometric contrasts of the Cerrado tree Dalbergia miscolobium in full sun and shade environments
Item type: Journal Article • Journal: Southern Forests: a Journal of Forest Science • Authors: Ane Marcela das Chagas Mendonça --- , Brazil Jean Marcel Sousa Lira --- , Brazil Marcelo Rodrigues --- , Brazil Vanessa da Fontoura Custódio Monteiro --- , Brazil Edson Simão --- , Brazil João Paulo Rodrigues Alves Delfino Barbosa --- , BrazilThe Brazilian Cerrado is a mosaic comprised of different vegetation formations and consequently, different environmental conditions. Tree density modifies the availability of light and affects species distribution. Thus, seedlings of species with a broad distribution should show contrasting anatomical, morphological,... -
Management research in Africa: Insights from organizational neuroscience
Item type: Journal Article • Journal: Africa Journal of Management • Authors: Constant Beugré --- , USAThe present paper discusses the application of organizational neuroscience in management research in Africa. In so doing, the paper draws from the field of neuroscience, organizational neuroscience, and cultural neuroscience to explore the extent to which topics, such as corruption,... -
Presence of microplastics in benthic macroinvertebrates along the Kenyan coast
Item type: Journal Article • Journal: African Journal of Marine Science • Authors: W Awuor --- , Kenya AWN Muthumbi --- , Kenya DV Robertson-Andersson --- , South AfricaMicroplastics (MPs) are plastics less than 5 mm in diameter. Their small size renders them invisible to deposit- and filter-feeding fauna, leading to unintentional ingestion. This study investigated the presence of MPs in an oyster (Saccostrea cuccullata) and three species... -
Microplastics pollution in the sediments of creeks and estuaries of Kenya, western Indian Ocean
Item type: Journal Article • Journal: African Journal of Marine Science • Authors: JO Kerubo --- , Kenya AWN Muthumbi --- , Kenya JM Onyari --- , Kenya D Robertson-Andersson --- , South Africa E Kimani --- , KenyaMicroplastic pollution has been recognised as a global threat in marine environments and a danger to prey, predators and humans. Yet, there have been few studies in the western Indian Ocean, specifically along the Kenyan coast, which makes it difficult... -
Digital innovations for transitioning to circular plastic value chains in Africa
Item type: Journal Article • Journal: Africa Journal of Management • Authors: Muyiwa Oyinlola --- , UK Patrick Schröder --- , UK Timothy Whitehead --- , UK Oluwaseun Kolade --- , UK Kutoma Wakunuma --- , UK Soroosh Sharifi --- , Barry Rawn --- , Rwanda Victor Odumuyiwa --- , Nigeria Selma Lendelvo --- , Namibia Geoff Brighty --- , UK Bosun Tijani --- , Nigeria Tomi Jaiyeola --- , Rwanda Lukonga Lindunda --- , Zambia Radhia Mtonga --- , Zambia Soroush Abolfathi --- , UKThe paper analyzes the current state of plastic value chains in Africa and the potential of digital innovations adopted by African entrepreneurs to contributing to a circular plastic economy. We provide an overview of plastic waste trade to African countries... -
Adoption of eco-bricks for housing: the case of Yelwa, Nigeria
Item type: Journal Article • Journal: African Journal of Science, Technology, Innovation and Development • Authors: Uche Emmanuel Edike --- , Nigeria Omotayo Aina --- , Nigeria Adebowale Babalola Adeoye --- , NigeriaThe benefits of eco-bricks have been highlighted in contemporary literature. Notwithstanding, the adoption of eco-bricks masonry for the construction of houses in rural communities of low-income countries is significantly low. This study investigated the features, benefits, drivers and barriers to... -
Association between plastic cards and mobile banking transactions in Kenya
Item type: Journal Article • Journal: African Journal of Science, Technology, Innovation and Development • Authors: Jasdeep Kaur --- University of Delhi, IndiaMobile banking has emerged as most popular mode of electronic banking in Kenya and people prefer to use it due to ease and convenience. Though mobile transactions are preferred by a large section of people, plastic cards are still widely... -
A circular economy approach to plastics in hospitality: a Frisian case study
Item type: Journal Article • Journal: Research in Hospitality Management • Authors: Livia Westgeest --- University of Groningen, The NetherlandsDespite its importance and influence on global plastic consumption, plastic management in the hospitality industry remains largely under-researched. This study aimed to investigate the perceived opportunities and barriers to reducing, reusing and recycling single-use plastics among a group of Frisian... -
Thermal tolerances of littorinid snails from temperate and subtropical South Africa
Item type: Journal Article • Journal: African Journal of Marine Science • Authors: CD McQuaid --- Rhodes University, South Africa TG Matumba --- Rhodes University, South AfricaEnvironmental temperature affects ectotherm performance and fitness because physiological performance increases up to a sublethal optimum temperature; this is not fixed, but depends on the species and individual history. We explored the influence of species identity, size and thermal history... -
Spatial and seasonal variation of microplastics and surface water quality of the Njoro River and Lake Nakuru ecosystems, Kenya
Item type: Journal Article • Journal: African Journal of Aquatic Science • Authors: Petra Kienyiy Chui --- Egerton University, Kenya Bernard Kibet Kirui --- Egerton University, Kenya Meshack Amos Obonyo --- Egerton University, KenyaHigh levels of plastic pollutants threaten aquatic habitats as the plastic materials are ingested by aquatic organisms as food. This study assessed seasonal variations of microplastics and the water quality of the Njoro River and Lake Nakuru, Kenya. Selected water... -
Occurrence of contaminants of emerging concern in the uMhlathuze and uThukela river systems, KwaZulu-Natal, South Africa
Item type: Journal Article • Journal: African Journal of Aquatic Science • Authors: LR Nsibande --- University of Zululand, South Africa RF Lehutso --- Water Centre, Council for Scientific and Industrial Research, South Africa M Thwala --- Academy of Science of South Africa, South Africa HMM Mzimela --- University of Zululand, South Africa M Seopela --- University of Johannesburg, South Africa NF Masikane --- University of Zululand, South AfricaContaminants of emerging concern (CECs), which include inorganic substances, exhibit potential adverse effects on aquatic life even though they commonly occur at very low concentrations in aquatic resources. The lack of data available about the risk of CECs to the... -
Epidemiology, spectrum, and pathology of surgical thyroid resections in a metropolitan South African setting
Item type: Journal Article • Journal: Journal of Endocrinology, Metabolism and Diabetes of South Africa • Authors: M van der Merwe --- Chris Hani Baragwanath Academic Hospital, South Africa AR Botha --- Chris Hani Baragwanath Academic Hospital, South Africa D van der Byl --- Chris Hani Baragwanath Academic Hospital, South Africa -
Ghost gear crisis: the threat of ‘abandoned, lost or otherwise discarded fishing gear’ (ALDFG)
Item type: Journal Article • Journal: African Journal of Marine Science • Authors: LA Odhiambo --- Directorate of Research and Innovation, Kenya F Kawaka --- Jaramogi Oginga Odinga University of Science and Technology, Kenya J Sande --- , KenyaAbandoned, lost or otherwise discarded fishing gear (ALDFG), also known as ghost gear, represents one of the most under-addressed environmental threats. ALDFG is a problem because it is often non-biodegradable and continues to trap marine life long after the gear... -
Comparing the activity of exploited and unexploited populations of a reef-dwelling seabream, Chrysoblephus laticeps, during an extreme upwelling and cold-spell event
Item type: Journal Article • Journal: African Journal of Marine Science • Authors: NT Mlotshwa --- Rhodes University, South Africa MR Skeeles --- Rhodes University, South Africa MI Duncan --- Rhodes University, South Africa C Muller --- Rhodes University, South Africa WM Potts --- Rhodes University, South Africa AC Winkler --- Rhodes University, South Africa A-R Childs --- Rhodes University, South AfricaAlong the south coast of South Africa, extreme upwelling events lead to rapid temperature declines and prolonged marine cold-spells, which have, on occasion, led to large-scale mortalities of coastal fishes. In a somewhat antagonistic process, fishing exploitation has been shown...