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Kaliumvaslegging in 'n Arcadia-grond II. Vaslegging in die kleifraksie
Item type: Journal Article • Journal: South African Journal of Plant and Soil • Authors: C.J. Steenkamp --- , Republiek van Suid-Afrika A.A. Theron --- Departement Grond- en Waterboukunde, Republiek van Suid-Afrika J.A. de Bruyn --- Departement Botanie, Republiek van Suid-AfrikaOndersoek is ingestel na die invloed van relatief lae toedienings van kalium, asook drogingstemperatuur, op die vermoë van die kleifraksie van 'n Arcadia-grond, versadig met kalsium of magnesium, om kalium vas te lê. Die verskil in reaksie tussen die behandelings... -
The relationship between ENSO and rainfall and yield in the South African sugar industry
Item type: Journal Article • Journal: South African Journal of Plant and Soil • Authors: A. Singels --- Department of Agronomy, Republic of South Africa C.N. Bezuidenhout --- Department of Agronomy, Republic of South AfricaInformation on the effects of El Nino on local climate and sugarcane production will assist planning and management. The objective of this study was to investigate the relationship between the southern oscillation index (SOI) and rainfall and sugarcane yields in... -
Effect of nitrogen supply on the production and distribution of dry matter in sugarcane
Item type: Journal Article • Journal: South African Journal of Plant and Soil • Authors: J. C.S. Allison --- , South Africa N.W. Pammenter --- , South AfricaSugarcane productivity is probably limited by characteristically slow early growth and, later, by progressively decreasing leaf nitrogen (N) concentration. Increasing the N supply might increase productivity by influencing these attributes. In a pot experiment on two cultivars N was supplied... -
Effect of leaf-section position and physiological stage of the donor plant on Lachenalia leaf-cutting performance
Item type: Journal Article • Journal: South African Journal of Plant and Soil • Authors: A.M. Ndou --- , South Africa J.G. Niederwieser --- , South Africa P.J. Robbertse --- Department of Plant Production and Soil Science, South AfricaThe effect of leaf-section position and physiological stage of the donor plant on leaf cutting performance was determined on three Lachenalia cultivars, viz ‘Romelia’, ‘Rupert’ and ‘Robyn’. Performance was evaluated in terms of leaf cutting survival, number of bulblets formed,... -
Efficacy of glyphosate, alternative post-emergence herbicides and tillage for control of Cynodon dactylon
Item type: Journal Article • Journal: South African Journal of Plant and Soil • Authors: PL Campbell --- , Republic of South AfricaCynodon dactylon (L.) Pers (cynodon) is a major weed in the South African sugarcane industry. Current recommendations involve repeated application of glyphosate for prolonged control. This paper describes three trials of a study to identify alternative treatments. Trial 1 screened... -
Image analysis to quantify herbicide efficacy for Cynodon dactylon control
Item type: Journal Article • Journal: South African Journal of Plant and Soil • Authors: P.L. Campbell --- , Republic of South Africa M.T. Smith --- , Republic of South Africa C. Sewpersad --- , Republic of South Africa M. van den Berg --- , Republic of South AfricaStudies on the effectiveness of herbicides for control of Cynodon dactylon (L.) Pers. (cynodon) normally rely on visual recording methods, which are rapid and convenient, but lack objectiveness and reproducibility. To address this problem, a computer software package was customized... -
Non-uptake of silicon and variable nematode species relationships between different levels of this element in sugarcane
Item type: Journal Article • Journal: South African Journal of Plant and Soil • Authors: S.D. Berry --- , South Africa V.W. Spaull --- , South Africa P.V. Ramouthar --- , South Africa P. Cadet --- , FranceSilicon (Si) is known to alleviate biotic and abiotic stresses in many crops. Much of the research on the biotic influence of Si has dealt with insects and fungi, with no proper studies on the effect of Si on plant-parasitic... -
Simultaneous selection for yield and ratooning ability in sugarcane genotypes using analysis of covariance
Item type: Journal Article • Journal: South African Journal of Plant and Soil • Authors: MM Zhou --- , South Africa MD Shoko --- Faculty of Agricultural Sciences, ZimbabweRatooning ability increases sugarcane production economics by reducing frequency of planting. During sugarcane breeding, indirect selection for pest resistance and direct selection for high ratoon yields increases ratooning ability. The objective of this study was to describe the simultaneous screening... -
Family selection gains for quality traits among South African sugarcane breeding populations
Item type: Journal Article • Journal: South African Journal of Plant and Soil • Authors: MM Zhou --- South African Sugarcane Research Institute, South Africa ML Lichakane --- South African Sugarcane Research Institute, South AfricaIn sugarcane breeding, family selection has been shown to produce larger gains than individual plant selection. During family selection, whole families of seedlings are selected or rejected based on data derived from replicated family plots. The objective of this study... -
Estimation of thrips (Fulmekiola serrata Kobus) density in sugarcane using leaf-level hyperspectral data
Item type: Journal Article • Journal: South African Journal of Plant and Soil • Authors: ElfatihM Abdel-Rahman --- School of Environmental Sciences, South Africa Mike Way --- , South Africa Fethi Ahmed --- School of Environmental Sciences, South Africa Riyad Ismail --- School of Environmental Sciences, South Africa Elhadi Adam --- School of Environmental Sciences, South AfricaThe aim of this study was to investigate the potential use of leaf-level hyperspectral data to predict the density of sugarcane thrips Fulmekiola serrata (Kobus). A hand-held spectroradiometer was used to make the spectral measurements on spindle leaves of 4-... -
Evaluation of Desmodium uncinatum, Fagopyrum esculentum and Brachiaria humidicola as potential green manure crops for nematode management in sugarcane
Item type: Journal Article • Journal: South African Journal of Plant and Soil • Authors: Ruth Rhodes --- South African Sugarcane Research Institute, South Africa Shaun D Berry --- South African Sugarcane Research Institute, South Africa Prabashnie V Ramouthar --- South African Sugarcane Research Institute, South Africa R Stuart Rutherford --- South African Sugarcane Research Institute, South AfricaPlant-parasitic nematodes remain a challenge to sugarcane growers in South Africa, and alternatives to chemical control are desirable. This project aimed to determine the impact of green manure crops Desmodium uncinatum, Fagopyrum esculentum and Brachiaria humidicola on nematodes and subsequent... -
Precision in systematic trawl surveys as assessed from replicate sampling by parallel trawling off Namibia
Item type: Journal Article • Journal: South African Journal of Marine Science • Authors: T. Strømme T. IilendeFollowing independence of Namibia in 1990, abundance of that country's hake stocks was monitored by trawl surveys conducted by the Norwegian F.R.V. Dr Fridtjof Nansen using a systematic survey design. Precision from such designs is considered to be better than... -
LARVAL AND PUPIL BEHAVIOUR IN CULISETA LONGIAREOLATA (MACQUART, 1838) (CULICIDAE, DIPTERA)
Item type: Journal Article • Journal: Journal of the Limnological Society of Southern Africa • Authors: R. van Pletzen --- Department of Zoology and Entomology, South AfricaSix larval and two pupal activities could be distinguished. The larval activities are medium filter-feeding (MFF), surface filter-feeding (SFF), browsing and gnawing (BRG), swimming (SS), surface hanging (HA) and grooming (GR). The pupal activities are limited to surface hanging (HA)... -
EFFECT OF PROGRAMMED CIRCADIAN TEMPERATURE FLUCTUATIONS ON POPULATION DYNAMICS OF BULINUS TROPICUS (KRAUSS) AND LYMNAEA NATALENSIS KRAUSS (GASTROPODA: MOLLUSCA)
Item type: Journal Article • Journal: Journal of the Limnological Society of Southern Africa • Authors: K.N. de Kock --- Department of Zoology, South AfricaUntil now all life-table studies on Bulinus tropicus (Krauss) and Lymnaea natalensis Krauss involving temperature as the variable factor have been conducted at constant temperatures. This study evaluates the effect of programmed, circadian temperature fluctuations, ranging from 18 to 28... -
False killer whale Pseudorca crassidens mass stranding at Long Beach on South Africa's Cape Peninsula, 2009
Item type: Journal Article • Journal: African Journal of Marine Science • Authors: SP Kirkman --- Department of Environmental Affairs, South Africa MA Meÿer --- Department of Environmental Affairs, South Africa M Thornton --- Mammal Research Institute, Department of Zoology and Entomology, South AfricaA mass stranding of false killer whales Pseudorca crassidens at Long Beach near the village of Kommetjie (34°8.18'S, 18°9.77'E) on the Cape Peninsula, South Africa, in May 2009 is described. Theestimated size of stranded group was 55 animals, which is... -
Killer whales in South African waters—a review of their biology
Item type: Journal Article • Journal: African Journal of Marine Science • Authors: PB Best --- Mammal Research Institute, South Africa MA Meÿer --- Department of Environmental Affairs, South Africa C Lockyer --- , DenmarkThe distribution, seasonality and schooling behaviour of killer whales Orcinus orca in South African waters have been investigated from 785 records compiled between 1963 and 2009, and their size, morphometrics, growth, reproduction, food and feeding behaviour described from the examination... -
Effect of dietary protein to energy ratio on growth and nitrogenous waste production of cultured dusky kob Argyrosomus japonicus
Item type: Journal Article • Journal: African Journal of Marine Science • Authors: LD Woolley --- Department of Ichthyology and Fisheries Science, South Africa CLW Jones --- Department of Ichthyology and Fisheries Science, South Africa PJ Britz --- Department of Ichthyology and Fisheries Science, South AfricaThe effect of dietary protein to energy ratio (P:E) on the growth of dusky kob Argyrosomus japoni-cus was investigated as a first step towards formulating a practical diet for this potential mariculture species in South Africa. The effects of dietary... -
Prey and seasonal abundance of killer whales at sub-Antarctic Marion Island
Item type: Journal Article • Journal: African Journal of Marine Science • Authors: RR Reisinger --- Mammal Research Institute, Department of Zoology and Entomology, South Africa PJN de Bruyn CA Tosh WC Oosthuizen NT Mufanadzo MN BesterThe diet of killer whales Orcinus orca was investigated from 48 predation events observed during 823 sightings at sub-Antarctic Marion Island between 2006 and 2009. From these events, there were 10 cases where prey could be identified. Killer whales fed... -
Sightings of killer whales Orcinus orca from longline vessels in South African waters, and consideration of the regional conservation status
Item type: Journal Article • Journal: African Journal of Marine Science • Authors: AJ Williams SL Petersen M Goren BP WatkinsKiller whales Orcinus orca are seldom reported from South African nearshore waters but, allowing for the bias of vessel attraction, observations from longline vessels suggest there is a resident offshore population of fish-eating killer whales. We present reports of killer... -
Confirmation of the occurrence of a second killer whale morphotype in South African waters
Item type: Journal Article • Journal: African Journal of Marine Science • Authors: PB Best --- Mammal Research Institute, Whale Unit, South Africa MA Meÿer --- Branch: Oceans and Coasts, Department of Environmental Affairs, South Africa M Thornton --- Mammal Research Institute, Whale Unit, South Africa PGH Kotze --- Branch: Oceans and Coasts, Department of Environmental Affairs, South Africa SM Seakamela --- Branch: Oceans and Coasts, Department of Environmental Affairs, South Africa GJG Hofmeyr --- Port Elizabeth Museum at Bayworld, Port Elizabeth, and Department of Zoology, South Africa S Wintner --- KwaZulu-Natal Sharks Board, Umhlanga Rocks, and Biomedical Resource Unit, South Africa CD Weland --- Canadian Centre for DNA Barcoding, Biodiversity Institute of Ontario, Canada D Steinke --- Canadian Centre for DNA Barcoding, Biodiversity Institute of Ontario, CanadaKiller whales Orcinus orca occur worldwide in a number of morphotypes that differ in size, pigmentation, acoustic behaviour, food type and genetics – some may indeed warrant subspecific or even specific status. Until recently, all killer whales in South African... -
Estimating scavenger and search bias for collision fatality surveys of large birds on power lines in the Karoo, South Africa
Item type: Journal Article • Journal: Ostrich: Journal of African Ornithology • Authors: Maurice Schutgens --- DST/NRF Centre of Excellence at the Percy FitzPatrick Institute of African Ornithology, South Africa Jessica M Shaw --- DST/NRF Centre of Excellence at the Percy FitzPatrick Institute of African Ornithology, South Africa Peter G Ryan --- DST/NRF Centre of Excellence at the Percy FitzPatrick Institute of African Ornithology, South AfricaBird collision mortality associated with power lines is a global conservation challenge, but periodic carcass counts along power lines underestimate actual mortality because of survey biases. We conducted a scavenger trial over 90 days and three observer detection trials after... -
A challenging case of hypercalcaemia
Item type: Journal Article • Journal: Journal of Endocrinology, Metabolism and Diabetes of South Africa • Authors: V Ueckermann --- Department of Internal Medicine, -
Ehlers-Danlos syndrome with parathyroid adenoma for excision
Item type: Journal Article • Journal: Southern African Journal of Anaesthesia and Analgesia • Authors: S Kamat --- Director Professor, Goa Medical College, India C Deepa --- Fellow in Critical Care Medicine, Narayana Hrudayalaya, India J Fernandes --- Junior Resident, Goa Medical College, IndiaEhlers-Danlos syndrome (EDS) consists of a group of connective tissue disorders characterised by hyperelasticity of the skin and hypermobile joints. Parathyroid adenoma results in increased parathyroid hormone secretion. We report the case of a 20-year-old male patient with EDS and... -
Lights out, let’s move about: locomotory activity patterns of Wagner’s gerbil from the desert of Saudi Arabia
Item type: Journal Article • Journal: African Zoology • Authors: A.N. Alagaili --- KSU Mammals Research Chair, Department of Zoology, College of Science, Saudi Arabia O.B. Mohammed --- KSU Mammals Research Chair, Department of Zoology, College of Science, Saudi Arabia N.C. Bennett --- KSU Mammals Research Chair, Department of Zoology, College of Science, Saudi Arabia M.K. Oosthuizen --- Mammal Research Institute, Department of Zoology & Entomology, South AfricaWe investigated the circadian activity rhythm in the little-studied Wagner’s gerbil (Gerbillus dasyurus) from the Raydah Protected Area, southwestern Saudi Arabia. In order to assess whether these animals possess an endogenous rhythm of locomotor activity that entrains to the light:... -
Determining adrenocortical activity as a measure of stress in African buffalo (Syncerus caffer) based on faecal analysis
Item type: Journal Article • Journal: African Zoology • Authors: A. Ganswindt --- Mammal Research Institute, Department of Zoology and Entomology, South Africa A.S.W. Tordiffe --- National Zoological Gardens of South Africa, South Africa E. Stam --- Mammal Research Institute, Department of Zoology and Entomology, South Africa M.J. Howitt --- National Zoological Gardens of South Africa, South Africa F. Jori --- Mammal Research Institute, Department of Zoology and Entomology, South AfricaLittle is known about the levels of stress experienced by African buffalos affected by injury, disease, or socio-ecological and anthropogenic factors. To be able to start filling this gap, we examined the suitability of two 11-oxoaetiocholanolone enzyme-immunoassays (EIAs) detecting 11,17... -
Trends in African Black Oystercatcher Haematopus moquini populations between the early 1980s and early 2000s, with consideration of the influence of protected habitats and food availability
Item type: Journal Article • Journal: Ostrich: Journal of African Ornithology • Authors: Douglas Loewenthal --- Percy FitzPatrick Institute of African Ornithology, DST–NRF Centre of Excellence, South Africa Dane M Paijmans --- Percy FitzPatrick Institute of African Ornithology, DST–NRF Centre of Excellence, South Africa Philip W Haupt --- Seychelles Islands Foundation, Republic of Seychelles Philip AR Hockey --- Percy FitzPatrick Institute of African Ornithology, DST–NRF Centre of Excellence, South AfricaThe African Black Oystercatcher Haematopus moquini is classified as Near Threatened because the population size is small (<10 000) and numbers have decreased or were previously recorded as decreasing. Although human activity has increased in many parts of the species’... -
Differential reactions to anthropogenic disturbance by two ground-nesting shorebirds
Item type: Journal Article • Journal: Ostrich: Journal of African Ornithology • Authors: Shirley Van de Voorde --- Van Hall Larenstein, The Netherlands Minke Witteveen --- Percy FitzPatrick Institute of African Ornithology, DST–NRF Centre of Excellence, South Africa Mark Brown --- School of Life Sciences, South AfricaMany ground-nesting shorebirds experience a high level of anthropogenic disturbance, often to the detriment of their breeding success. This study investigated the responses of the Near-Threatened African Black Oystercatcher Haematopus moquini (ABO) and the Least Concern Kelp Gull Larus dominicanus... -
Temporal and spatial differences in three-egg clutch frequency of the African Black Oystercatcher
Item type: Journal Article • Journal: Ostrich: Journal of African Ornithology • Authors: Dane M Paijmans --- Percy FitzPatrick Institute of African Ornithology, DST–NRF Centre of Excellence, South Africa Douglas Loewenthal --- , Peter G Ryan --- Percy FitzPatrick Institute of African Ornithology, DST–NRF Centre of Excellence, South Africa Philip AR Hockey --- ,African Black Oystercatchers Haematopus moquini produce a modal clutch size of two eggs and only rarely lay three eggs. A review of over 4 000 nest records from across their breeding range (dating back to the early 1960s) revealed that... -
Triple negative, basal-like and BRCA1-associated breast cancers – what’s the difference and should anyone care?
Item type: Journal Article • Journal: Southern African Journal of Gynaecological Oncology • Authors: T Slavik --- Ampath Pathology Laboratories, South AfricaBreast carcinoma is common in women and forms an integral part of the BRCA familial cancer syndromes. As breast cancer is considered a heterogeneous disease, clinicians have traditionally relied on clinical and morphologic findings, as well as hormone receptor/HER-2 status... -
Water and radiation use efficiency of sugarcane for bioethanol production in South Africa, benchmarked against other selected crops
Item type: Journal Article • Journal: South African Journal of Plant and Soil • Authors: Francois C Olivier --- South African Sugarcane Research Institute, South Africa Abraham Singels --- South African Sugarcane Research Institute, South Africa Alana B Eksteen --- South African Sugarcane Research Institute, South AfricaThere are indications that high-fibre sugarcane genotypes may produce more biomass and use resources more efficiently than conventional sugarcane cultivars. The objective of this research was to gather quantitative information on resource use for selected conventional and high-fibre sugarcane genotypes... -
Carbon stocks of the terraces of the Lower Tana River floodplain and delta, Kenya, prior to conversion for biofuel production
Item type: Journal Article • Journal: African Journal of Aquatic Science • Authors: LV Mukhwana --- Kenya Wetlands Biodiversity Research Team (KENWEB), Kenya Q Luke --- Kenya Wetlands Biodiversity Research Team (KENWEB), Kenya E Delmas --- Kenya Wetlands Biodiversity Research Team (KENWEB), Kenya K Otoi --- Kenya Wetlands Biodiversity Research Team (KENWEB), Kenya O Hamerlynck --- Kenya Wetlands Biodiversity Research Team (KENWEB), Kenya L Vandepitte --- Flanders Marine Institute (VLIZ), Belgium B Adkins --- Dadacha Consulting Ltd, KenyaFew studies have addressed the terraces adjacent to the Tana River and delta. In May 2012 a survey assessed the woody vegetation of the terraces in anticipation of their conversion to a biofuel farm. The 64 000 hectares targeted by... -
Family versus individual plant selection for stem borer (Eldana saccharina) resistance in early stages of sugarcane breeding in South Africa
Item type: Journal Article • Journal: South African Journal of Plant and Soil • Authors: Marvellous Zhou --- South African Sugarcane Research Institute, South Africa Alfred Mokwele --- South African Sugarcane Research Institute, South AfricaEldana saccharina is an indigenous lepidopteran insect pest and the most damaging stem borer of sugarcane in southern Africa. Breeding for E. saccharina resistance in South Africa started in 1980 by crossing resistant parents (expected to possess resistance genes) and... -
Farmer perceptions of climate change impacts on Swaziland’s sugar industry
Item type: Journal Article • Journal: African Journal of Science, Technology, Innovation and Development • Authors: Bon’sile Faith Nicollete Mhlanga-Ndlovu --- Department of Environmental Science, South Africa Godwell Nhamo --- Institute for Corporate Citizenship, University of South Africa, South AfricaThis study investigates the perceptions of sugarcane farmers on climate change impacts and their potential alternative livelihoods in the Lowveld of Swaziland with the objective of informing research and policy initiatives. The study obtained data mainly from a survey involving... -
Growth and yield responses of commercial sugarcane cultivars to mulching in the coastal rainfed region of South Africa
Item type: Journal Article • Journal: South African Journal of Plant and Soil • Authors: Nkosinathi Nxumalo --- South African Sugarcane Research Institute, South Africa Sanesh Ramburan --- South African Sugarcane Research Institute, South Africa J Martin Steyn --- Department of Plant Production and Soil Science, South AfricaThe perceived negative cultivar responses to mulching has limited the adoption of this practice in the South African sugarcane industry. This study was aimed at evaluating cane yield and quality responses and population dynamics of popular cultivars to mulching in... -
Carbon dioxide: making the right connection
Item type: Journal Article • Journal: Southern African Journal of Anaesthesia and Analgesia • Authors: Matthew Winton Gibbs --- Department of Anaesthesia & Perioperative Medicine, South Africa Ross Hofmeyr --- Department of Anaesthesia & Perioperative Medicine, South AfricaCarbon dioxide has been used in anaesthesia since the late 1920s, principally to stimulate breathing after a period of hyperventilation in the era before routine use of capnography. The authors’ tertiary academic hospital still has the infrastructure for pipeline delivery... -
Focusing on monofilament nets while overlooking the priorities of artisanal fisheries governance in Senegal
Item type: Journal Article • Journal: African Journal of Marine Science • Authors: D Thiao --- Centre de Recherches Océanographiques de Dakar-Thiaroye (CRODT), Senegal A Mbaye --- Centre de Recherches Océanographiques de Dakar-Thiaroye (CRODT), Senegal M Dème --- Centre de Recherches Océanographiques de Dakar-Thiaroye (CRODT), Senegal HD Diadhiou --- Centre de Recherches Océanographiques de Dakar-Thiaroye (CRODT), SenegalDespite its legal prohibition since 1998, the nylon monofilament net is still widely used in Senegalese artisanal fisheries. To achieve a complete ban on monofilament use, it is necessary to understand the main arguments for its continued use and what... -
Location and crop-year effects on sugarcane genotype performance for the coastal short cycle breeding programmes in South Africa
Item type: Journal Article • Journal: South African Journal of Plant and Soil • Authors: Sphamandla Sengwayo --- South African Sugarcane Research Institute, South Africa Marvellous Zhou --- South African Sugarcane Research Institute, South Africa Maryke Labuschagne --- Department of Plant Sciences, South AfricaGenotypes are tested in several environments to evaluate the influence of genotype × environment interactions prior to their release as cultivars. The objective of this study was to determine location and crop-year effects and their implications on coastal short cycle... -
Changes in bat community composition and activity patterns across a conservation-agriculture boundary
Item type: Journal Article • Journal: African Zoology • Authors: Fezile Mtsetfwa --- Department of Wildlife Ecology and Conservation, School of Natural Resource and Environment, United States Robert A McCleery --- Department of Wildlife Ecology and Conservation, School of Natural Resource and Environment, United States Ara Monadjem --- Department of Wildlife Ecology and Conservation, School of Natural Resource and Environment, United StatesAgricultural landscapes are typically associated with a decreased biodiversity, particularly when they extend across large spatial scales. Despite the fact that some African bat species seem to provide essential ecosystem services across landscapes, we only have a limited understanding of... -
Rickets mimicker: a report of two cases of primary hyperparathyroidism in adolescence
Item type: Journal Article • Journal: Journal of Endocrinology, Metabolism and Diabetes of South Africa • Authors: Imran M Paruk --- Department of Diabetes and Endocrinology, South Africa Fraser J Pirie --- Department of Diabetes and Endocrinology, South Africa Ayesha A Motala --- Department of Diabetes and Endocrinology, South AfricaThe presentation of primary hyperparathyroidism (PHPT) in most Western countries has evolved from the classic description of ‘stones, bones, and groans’ to becoming increasingly asymptomatic as a result of more frequent serum calcium screening. However, many developing countries are still... -
Weed management in sugarcane using a combination of imazapyr followed by velvet bean as a break crop
Item type: Journal Article • Journal: South African Journal of Plant and Soil • Authors: Peta L Campbell --- South African Sugarcane Research Institute, South Africa Richard P Beckett --- School of Life Sciences, South Africa Graeme W Leslie --- Simbithi Estate, South AfricaWhile farmers have used glyphosate to control the growth of weeds such as Cynodon dactylon (cynodon) in sugarcane fields for many years, its use has problems which include poor persistence in the soil and the development of tolerance. Here the... -
Architectures of visibility and invisibility: a reflection on the secret affinities of Johannesburg’s cross-border shopping hub
Item type: Journal Article • Journal: Anthropology Southern Africa • Authors: Tanya Zack --- School of Architecture and Planning, Thireshen Govender --- Graduate School of Architecture, South AfricaThe inner city of Johannesburg, South Africa, is the site of an intense wholesale and retail trade in fast fashion. Here mostly migrant entrepreneurs supply billions of rand worth of Chinese apparel to local and cross-border shoppers from across sub-Saharan... -
Architecture-by-migrants: the porous infrastructures of Bellville
Item type: Journal Article • Journal: Anthropology Southern Africa • Authors: Huda Tayob --- The Bartlett School of Architecture, United KingdomThis paper takes as its subject a series of contingent mixed-use urban markets that have been established in Cape Town, South Africa, by migrants, refugees and asylum seekers from various parts of the African continent. It argues that migrant spaces... -
Urban secrets? Affinities and anthropologies of South African cities
Item type: Journal Article • Journal: Anthropology Southern Africa • Authors: Corinne Kratz --- Department of Anthropology and Institute of African Studies, United States of America Jill Weintroub --- Life in the City Programme, Wits City Institute, South Africa Noëleen Murray --- Wits City Institute, South AfricaThis paper reflects on the discussions of a collective of academics in and around Johannesburg, Africa’s iconic city built on the extractive capital of gold mining. Captured aptly in William Kentridge’s art film Johannesburg: Second Greatest City after Paris (1989),... -
Impacts of a concentrated solar power trough facility on birds and other wildlife in South Africa
Item type: Journal Article • Journal: Ostrich: Journal of African Ornithology • Authors: Corey Jeal --- FitzPatrick Institute of African Ornithology, DST-NRF Centre of Excellence, South Africa Vonica Perold --- FitzPatrick Institute of African Ornithology, DST-NRF Centre of Excellence, South Africa Samantha Ralston-Paton --- BirdLife South Africa, South Africa Peter G Ryan --- FitzPatrick Institute of African Ornithology, DST-NRF Centre of Excellence, South AfricaThis study assesses bird and wildlife mortality and changes in bird species communities at a 50 MW utility-scale concentrated solar power parabolic trough facility in South Africa. The facility was searched for evidence of large vertebrate mortalities over three months... -
Using logistic regression models to determine optimum combination of cane yield components among sugarcane breeding populations
Item type: Journal Article • Journal: South African Journal of Plant and Soil • Authors: Marvellous Zhou --- Department of Plant Breeding, South AfricaPlant breeding aims to produce cultivars that possess optimum trait combinations for yield and other traits. Path coefficient analysis in sugarcane showed number, height and diameter of stalks control cane yield. The objectives of this study were to determine optimum... -
Effect of mound-building termites on soil physicochemical properties and sugarcane stalk heights
Item type: Journal Article • Journal: South African Journal of Plant and Soil • Authors: Sandile S Mthimkhulu --- South African Sugarcane Research Institute, South Africa Neil Miles --- South African Sugarcane Research Institute, South Africa Louis W Titshall --- South African Sugarcane Research Institute, South Africa Phesheya Dlamini --- Department of Plant Production, Soil Science and Agricultural Engineering, South AfricaThis study investigated soil factors responsible for localised patches of enhanced sugarcane growth on the remains of termite (Macrotermes natalensis) mounds observed on predominantly coarse-textured soils (weak sands) of KwaZulu-Natal province, South Africa. Soil samples (0–20 cm depth) were collected... -
Identification of land predators of African Penguins Spheniscus demersus through post-mortem examination
Item type: Journal Article • Journal: Ostrich: Journal of African Ornithology • Authors: Ralph ET Vanstreels --- Marine Apex Predator Research Unit, Institute for Coastal and Marine Research, South Africa Nola J Parsons --- Southern African Foundation for the Conservation of Coastal Birds, South Africa Cuan McGeorge --- Stony Point Nature Reserve, South Africa Renata Hurtado --- Southern African Foundation for the Conservation of Coastal Birds, South Africa Katrin Ludynia --- Southern African Foundation for the Conservation of Coastal Birds, South Africa Lauren Waller --- Southern African Foundation for the Conservation of Coastal Birds, South Africa Monique Ruthenberg --- Hottentots Holland Nature Reserve, South Africa Arne Purves --- Environmental Management Department, Transport and Urban Development Authority, South Africa Lorien Pichegru --- Marine Apex Predator Research Unit, Institute for Coastal and Marine Research, South Africa Pierre A Pistorius --- Marine Apex Predator Research Unit, Institute for Coastal and Marine Research, South AfricaThe African Penguin Spheniscus demersus is an endangered seabird endemic to southern Africa, and killing sprees by terrestrial predators have been one of the main threats for its mainland colonies. The methods employed to manage predators may differ depending on... -
Optimising the number of test sites, crop-years and replications to maximize post-release testing efficiencies
Item type: Journal Article • Journal: South African Journal of Plant and Soil • Authors: Sbongeleni Warren Duma --- School of Agricultural, Earth and Environmental Sciences, South Africa Hussein Shimelis --- School of Agricultural, Earth and Environmental Sciences, South Africa Sanesh Ramburan --- School of Agricultural, Earth and Environmental Sciences, South Africa Admire Isaac Tichafa Shayanowako --- School of Agricultural, Earth and Environmental Sciences, South AfricaThe South African sugar industry develops commercial sugarcane cultivars across multiple testing sites, crop-years and replications. The extent of such parameters has not been well quantified for optimum breeding and resource allocation. The objective of this study was to identify... -
Thermal stability of a vegetable oil-based thermal fluid at high temperature
Item type: Journal Article • Journal: African Journal of Science, Technology, Innovation and Development • Authors: Aboubakar Gomna --- Laboratoire Énergies Renouvelables et Efficacité Énergétique (LabEREE), Burkina Faso Kokouvi Edem N’Tsoukpoe --- Laboratoire Énergies Renouvelables et Efficacité Énergétique (LabEREE), Burkina Faso Nolwenn Le Pierrès --- LOCIE, France Yézouma Coulibaly --- Laboratoire Énergies Renouvelables et Efficacité Énergétique (LabEREE), Burkina FasoSynthetic and mineral oils are widely used in high temperature processes (above 200°C) as heat transfer fluids or thermal storage materials. Mineral oils are essentially derived from petroleum that is depleting and synthetic oils are expensive. Furthermore, these oils are... -
Technico-economic comparison of heat transfer fluids or thermal energy storage materials: A case study using Jatropha curcas oil
Item type: Journal Article • Journal: African Journal of Science, Technology, Innovation and Development • Authors: Kokouvi Edem N’Tsoukpoe --- , Burkina Faso Nolwenn Le Pierrès --- , France Yao Manu Seshie --- , Burkina Faso Yézouma Coulibaly --- , Burkina FasoThermal oils are omnipresent in processes using heat at high temperature as heat transfer fluids (HTFs) as well as thermal storage materials (TESMs), particularly in concentrating solar plants. In this study, a methodology for technico-economic comparison of HTF and TESM... -
Identification of technical factors that influence sugar productivity of factories in Sudan
Item type: Journal Article • Journal: African Journal of Science, Technology, Innovation and Development • Authors: Tageldeen S. Ibrahim --- , South Africa Tilahun S. Workneh --- , South AfricaThis study was conducted to identify the factors influencing the productivity of the sugar industry in Sudan. The study involved collecting data from selected sugar mill databases, namely, the Kenana, Guneid, Halfa, Sinnar, Assalaya and White-Nile sugar mills. The data... -
Fear at the top: killer whale predation drives white shark absence at South Africa’s largest aggregation site
Item type: Journal Article • Journal: African Journal of Marine Science • Authors: AV Towner --- , South Africa RGA Watson --- , South Africa AA Kock --- , South Africa Y Papastamatiou --- , United States M Sturup --- , South Africa E Gennari --- , South Africa K Baker --- , South Africa T Booth --- , South Africa M Dicken --- , South Africa W Chivell --- , South Africa S Elwen --- , South Africa T Kaschke --- , South Africa D Edwards --- , South Africa MJ Smale --- , South AfricaRisk-induced fear effects exerted by top predators are pervasive in terrestrial and marine systems, with lasting impacts on ecosystem structure and function. The loss of top predators can disrupt ecosystems and trigger trophic cascades, but the introduction of novel apex... -
The short-term effects of surface-applied dolomitic lime and gypsum on soil chemical properties and yields of sugarcane ratoon crops in KwaZulu-Natal, South Africa
Item type: Journal Article • Journal: South African Journal of Plant and Soil • Authors: Sandile Siphesihle Mthimkhulu --- , South Africa Dimpho Elvis Elephant --- , South Africa Neil Miles --- , South Africa Louis William Titshall --- , South AfricaThis study investigated the effects of surface-application of lime and gypsum on soil properties and yields of ratoon sugarcane crops. Treatments involved once-off surface application of dolomitic lime (L), gypsum (G) and dolomitic lime plus gypsum (LG) in factorial combination,... -
Molluscicidal and cercaricidal effects of Persicaria senegalensis on Radix natalensis snails and their echinostome-shed cercariae in South Africa
Item type: Journal Article • Journal: African Journal of Aquatic Science • Authors: MC Mathole --- Sefako Makgatho Health Sciences University, South Africa PH King --- Sefako Makgatho Health Sciences University, South AfricaPersicaria senegalensis is an aquatic plant of the Family Polygonaceae with apparent molluscicidal properties. The research evaluated the molluscicidal effect of P. senegalensis on the freshwater snail Radix natalensis, and its echinostome-shed cercariae. Various compounds from Persicaria senegalensis were extracted... -
Global structure of positive solutions for semipositone nonlinear Euler-Bernoulli beam equation with Neumann boundary conditions
Item type: Journal Article • Journal: Quaestiones Mathematicae • Authors: Jingjing Wang --- Northwest Normal University, People’s Republic of China Chenghua Gao --- Northwest Normal University, People’s Republic of China Yanqiong Lu --- Northwest Normal University, People’s Republic of ChinaIn this paper, we focus on the existence of positive solutions for nonlinear fourth-order Neumann boundary value problem -
Global bifurcation from zero in nonlinear Sturm-Liouville equation with a spectral parameter in the boundary condition
Item type: Journal Article • Journal: Quaestiones Mathematicae • Authors: Ziyatkhan S. Aliyev --- Baku State University, Azerbaijan Nurida A. Ismayilova --- , AzerbaijanIn this paper, we consider the nonlinear Sturm-Liouville problem with a spectral parameter in the boundary condition. We show the existence of two families of unbounded continua of nontrivial solutions of this problem corresponding to the nodal properties that having... -
Changing structure of India’s exports with Africa: Where do the technology-intensive exports stand?
Item type: Journal Article • Journal: African Journal of Science, Technology, Innovation and Development • Authors: Mohd Fayaz --- Central University of Punjab, India Sandeep Kaur --- Central University of Punjab, IndiaThe present study is an endeavour to document the pattern of comparative advantage and structural changes of Indian exports with Africa with the help of revealed comparative advantage index and the constant market share model for the period 1980–2021. The... -
Some physical properties of a sandy clay loam humic soil under native forest and sugarcane in northern KwaZulu-Natal, South Africa
Item type: Journal Article • Journal: South African Journal of Plant and Soil • Authors: --- School of Agricultural, South Africa --- School of Agricultural, South Africa --- School of Agricultural, South AfricaThe conversion of native forest land to commercial farming can have profound effects on soil physical properties. This study compared bulk density (BD), saturated hydraulic conductivity (Ks) and other physical properties of a sandy loam humic soil under native forest... -
Global bifurcation of positive solutions for a class of superlinear biharmonic equations
Item type: Journal Article • Journal: Quaestiones Mathematicae • Authors: Mantang Ma --- Northwest Normal University, P.R. China Ruyun Ma --- Northwest Normal University, P.R. China Jiao Zhao --- Northwest Normal University, P.R. ChinaWe are concerned with semilinear biharmonic equations of the form -
On return to school: disorder symptoms, stress at home and evaluations of school COVID-19 measures
Item type: Journal Article • Journal: Journal of Child & Adolescent Mental Health • Authors: Virginia L. Lam --- University of Roehampton, United Kingdom Mandy F. O’Driscoll --- University of East London, United KingdomBackground: Social restrictions during the COVID-19 pandemic had a major impact on the mental health of children. Yet, analyses on the mental health of younger children in the later course of the pandemic are scarce. The present study assessed 8-... -
The influence of Connochaetes taurinus carcass decomposition on soil nutrient composition in grasslands
Item type: Journal Article • Journal: South African Journal of Plant and Soil • Authors: EA Kullander --- University of South Africa, South Africa MS Deutschländer --- University of South Africa, South Africa VM Ngole-Jeme --- University of South Africa, South Africa HI Melville --- University of South Africa, South AfricaDecomposing carcasses leach nutrients into soils, forming dense, nutrient-rich islands. The effect of liquid influx on ecological dynamics from decomposing blue wildebeest (Connochaetes taurinus) carcasses on soil nutrient content at various stages of decomposition in a grassland ecosystem was investigated... -
Global Bifurcation of Nodal Solutions of Elliptic Kirchhoff Equations
Item type: Journal Article • Journal: Quaestiones Mathematicae • Authors: Xuanrong Shi --- Northwest Normal University, P.R. China Ruyun Ma --- Northwest Normal University, P.R. ChinaWe prove the existence of nodal solutions to the Kirchhoff type problem