Search
Search results for
We found
13 results for you
-
Leaf scorch on Pennisetum clandestinum dryland pastures induced by liquid urea ammonium nitrate fertilizer
Item type: Journal Article • Journal: Journal of the Grassland Society of Southern Africa • Authors: G.D. Hefer --- Department of Grassland Science, Republic of South Africa V.G. Naiken --- Department of Grassland Science, Republic of South Africa N.M. Tainton --- Department of Grassland Science, Republic of South AfricaTransmission electron (TEM) and scanning electron microscopy (SEM) demonstrated that the application of liquid urea ammonium nitrate (UAN 32) fertilizer, in concentrated form, to dryland pastures resulted in leaf scorch and subsequent necrosis, irrespective of the level and concentration of... -
Morphogenesis of Malus domestica cv. Starking flower buds
Item type: Journal Article • Journal: South African Journal of Plant and Soil • Authors: O. Bergh --- ,Differentiation of reproductive buds of the Starking apple (Malus domestica) was studied by scanning electron microscopy. Differentiation of reproductive structures was initiated during the first week of January when the shoot apex flattened. In terminal flower primordia, sepal primordia were... -
Light, scanning and transmission electron microscopy studies on the conidiogenesis of Cercospora zeae-maydis on maize
Item type: Journal Article • Journal: South African Journal of Plant and Soil • Authors: P.M. Caldwell --- , South Africa M.D. Laing --- , South AfricaLight, scanning and transmission electron microscopy were used to study conidiophore formation and conidiogenesis by Cercospora zeae-maydis Tehon & Daniels, the causal organism of grey leaf spot on maize, Zea mays L. Hyphae aggregate in the substomatal cavity and give... -
DIGESTION OF MICROCYSTIS AERUGINOSA BY OREOCHROMIS MOSSAMBICUS
Item type: Journal Article • Journal: Journal of the Limnological Society of Southern Africa • Authors: F.C. de Moor --- , South Africa W.E. Scott --- , South AfricaThe mean assimilation efficiency of aquarium acclimatized Oreochromis mossambiaue fed on a diet of Microcystis aeruginosa collected from Hartbeespoort Dam was determined as 50,8% for total organic matter, 63,7% for protein and 75,5% for phosphorus. Transmission electron microscopic examination of... -
DEVELOPMENTS IN TWENTY-FIVE YEARS OF DIATOM (BACILLARIOPHYCEAE) RESEARCH IN SOUTH AFRICA
Item type: Journal Article • Journal: Journal of the Limnological Society of Southern Africa • Authors: R. E.M. Archibald --- Division of Water Technology, Republic of South AfricaDiatom research in South Africa can be divided into four distinct periods. The first period covers a span of some seventy years, beginning with Shadbolt's (1854) account of diatoms from Port Natal, and continuing with brief notes and reports on... -
The role of ornamental goldfish Carassius auratus in transfer of some viruses and ectoparasites to cultured fish in Egypt: comparative ultra-pathological studies
Item type: Journal Article • Journal: African Journal of Aquatic Science • Authors: MA Mahmoud --- Department of Pathology, Faculty of Veterinary Medicine, Egypt SM Aly --- , Egypt AS Diab --- , Egypt G. John --- Department of Biotechnology, IndiaGoldfish, common carp and Nile tilapia were sampled between September 2002 and May 2003 to investigate lesions induced by viral diseases and ectoparasites. Goldfish exhibited neoplasms, Dermocystidium sp., Ichthyophthirius multifiliis (Ich), Trichodina reticulata, Lernaea cyprinacea and systemic infections. Neoplastic and... -
Seed quality characteristics of a bambara groundnut (Vigna subterranea L.) landrace differing in seed coat colour
Item type: Journal Article • Journal: South African Journal of Plant and Soil • Authors: Tendai P Chibarabada --- Crop Science, School of Agricultural, Earth and Environmental Sciences, South Africa Albert T Modi --- Crop Science, School of Agricultural, Earth and Environmental Sciences, South Africa Tafadzwanashe Mabhaudhi --- Crop Science, School of Agricultural, Earth and Environmental Sciences, South AfricaBambara groundnut (Vigna subterranea L.) is an underutilised African legume that fits the same ecological niche as Arachis hypogea. It is still cultivated using landraces and little is known about their seed quality. The current study evaluated seed quality characteristics... -
Ultrastructure of epididymal spermatozoa in three social African mole-rats of the genus Cryptomys (Rodentia: Bathyergidae): conservatism in sperm morphology
Item type: Journal Article • Journal: African Zoology • Authors: K.A. Maswanganye --- Mammal Research Institute, Department of Zoology and Entomology, South Africa G.P. Malherbe --- Mammal Research Institute, Department of Zoology and Entomology, South Africa N.C. Bennett --- Mammal Research Institute, Department of Zoology and Entomology, South AfricaThe morphology, size and three-dimensional structure of spermatozoa from three representatives of the genus Cryptomys were investigated. To date, there has been no study to either elucidate the morphological features or relative dimensions of spermatozoa in the genus Cryptomys specifically,... -
An ultrastructural investigation of Argulus personatus Cunnington, 1913 (Crustacea: Branchiura) from Lake Tanganyika, northern Zambia
Item type: Journal Article • Journal: African Zoology • Authors: Quinton Tam --- Department of Zoology, South Africa Annemarié Avenant-Oldewage --- Department of Zoology, South Africa Ernest H. Williams --- Department of Marine Sciences,Sixteen male and one female specimen of Argulus personatus Cunnington, 1913, were collected from Bathybates ferox Boulenger, 1898, from Lake Tanganyika in northern Zambia. Light and scanning electron microscopy (SEM) examinations documented a thickening of cuticle located on the dorsal... -
A comparison of techniques employed in detection of avian malaria infection, South Africa
Item type: Journal Article • Journal: African Zoology • Authors: Sharon Okanga --- Percy FitzPatrick Institute, DST/NRF Centre of Excellence, University of Cape Town, South Africa Graeme S. Cumming --- Percy FitzPatrick Institute, DST/NRF Centre of Excellence, University of Cape Town, South Africa Phillip A. R. Hockey --- Percy FitzPatrick Institute, DST/NRF Centre of Excellence, University of Cape Town, South Africa Mercedes Grome --- Department of Biological Sciences, U.S.A. Jeffrey L. Peters --- Department of Biological Sciences, U.S.A.Avian malaria remains an obscure and mostly unknown avian infection despite the socio-economic threat it poses for poultry industries and its potential to hinder conservation efforts. Therefore, diagnostics for the infection should be expedient, efficient and flexible in applicability. We... -
High level of initial default among smear positive pulmonary tuberculosis in eThekwini health district, KwaZulu-Natal
Item type: Journal Article • Journal: Southern African Journal of Infectious Diseases • Authors: Lindiwe Priscilla Cele --- National Health Laboratory Services, South Africa Stephen Knight --- School of Nursing and Public Health, South Africa Elize Webb --- School of Health Systems and Public Health, SHSPH, South Africa Khin Tint --- SAFELTP NICD, South Africa Thembelihle Dlungwane --- School of Nursing and Public Health, South AfricaIn this study, initial tuberculosis (TB) default was measured in clinics in a district with a high incidence of TB. A retrospective review of TB case identification registers in 2007 found 4049 (9.0%) new smear positive pulmonary tuberculosis (PTB) cases... -
Microfilarial infections associated with body mass loss of Village Weavers Ploceus cucullatus
Item type: Journal Article • Journal: Ostrich: Journal of African Ornithology • Authors: Andong F Atawal --- AP Leventis Ornithological Research Institute, Nigeria Anthony C Mgbeahuruike --- Department of Veterinary Pathology and Microbiology, Faculty of Veterinary Medicine, Nigeria Martijn Hammers --- AP Leventis Ornithological Research Institute, NigeriaHaemoparasitic infections in wild birds have been widely studied in order to understand parasite–host relation- ships, but our understanding of their impact on the host's fitness is still limited. In this study, we quantified the associations between microfilarial infections and... -
Lamproglena monodi Capart, 1944 infecting Oreochromis niloticus (Linnaeus, 1758): additional information on infection, morphology and genetic data
Item type: Journal Article • Journal: African Zoology • Authors: Nehemiah Mogoi Rindoria --- , South Africa Quinton Marco Dos Santos --- , South Africa Shimaa E Ali --- , Egypt Mohammed Hasan Ibraheem --- , Egypt Annemariè Avenant-Oldewage --- , South AfricaLamproglena monodi Capart, 1944 adult females were first described from the Democratic Republic of the Congo and have been redescribed seven times from different cichlid species in Egypt, Burkina Faso and Brazil, all showing morphological variation. The adult male was...