Browsing Faculty of Natural and Agricultural Sciences by Title
Now showing items 171-190 of 4818
-
Alternaria toxins in South African sunflower seeds: cooperative study
(Springer, 2017)Sunflower seed samples (N = 80) from different sunflower cultivars originating from different localities in South Africa were analyzed for 15 toxins produced by fungi of the genus Alternaria by means of a simple one-step ... -
An alternative approach to weighted non-commutative Banach function spaces
(Springer, 2019)We use a weighted analogue of a trace to define a weighted non-commutative decreasing rearrangement and show its relationship with the singular value function. We further show an alternative approach to constructing weighted ... -
Alternative conceptions: turning adversity into advantage
(Springer, 2019)While a vast body of research has identified difficulties in students’ understanding about forces and acceleration and their related alternative conceptions, far less research suggests ways to use students’ alternative ... -
Alternative development in polystoma gallieni (platyhelminthes, monogenea) and life cycle evolution
(ELSEVIER, 2013)Considering the addition of intermediate transmission steps during life cycle evolution, developmental plasticity, canalization forces and inherited parental effect must be invoked to explain new host colonization. Unf ... -
Alternative nematode management strategies
(Springer, 2017)In South Africa, about 48 % of the people live in rural areas. A large portion (35 %) of this rural population lives below the poverty line. Most of these communities depend on the production of grain, leguminous and ... -
Aluminum triflate-cocatalyzed radical copolymerization of styrene and ethyl acrylate
(Springer, 2020)Various random copolymers, poly(styrene-co-ethyl acrylate), were synthesized by free radical bulk copolymerization cocatalyzed by aluminum triflate (Al(OTf)3). The experimental conditions for the polymerization reactions, ... -
An amazing sub-cambium flat mite from South Africa (Acari: Trombidiformes: Tenuipalpidae)
(Acarologia, 2019)An unusual sub-cambium flat mite, Phytoptipalpus occultuae sp. n., first found under the bark in blisters on stems of Senegalia caffra in Pretoria, South Africa is described and illustrated herein. This is a unique species ... -
Ambient aromatic hydrocarbon measurements at Welgegund, South Africa
(EGU, 2014)Aromatic hydrocarbons are associated with direct adverse human health effects and can have negative impacts on ecosystems due to their toxicity, as well as indirect negative effects through the formation of tropospheric ... -
Ambient particulate air pollution and daily mortality in 652 cities
(Massachusetts Medical Society, 2019)BACKGROUND The systematic evaluation of the results of time-series studies of air pollution is challenged by differences in model specification and publication bias. METHODS We evaluated the associations of inhalable ... -
Amelioration of iron mine soils with biosolids: effects on plant tissue metal content and earthworms
(Springer, 2016)The achievement of environmentally sound and economically feasible disposal strategies for biosolids is a major issue in the wastewater treatment industry around the world, including Swaziland. Currently, an iron ore mine ... -
An amended description of two Gyrodactylus species (Platyhelminthes: Monogenea) parasitizing Antarctic Notothenioid fish
(Cambridge Univ Press, 2020)Species identification based on the morphometry of opisthaptoral hard parts, in combination with internal transcribed spacer ribosomal DNA (ITS rDNA) region sequences, confirmed the presence of four viviparous Gyrodactylus ... -
Amino acid based imidazolium zwitterions as novel and green corrosion inhibitors for mild steel: experimental, DFT and MD studies
(Elsevier, 2017)Three novel amino acids based corrosion inhibitors namely 2-(3-(carboxymethyl)-1H-imidazol-3-ium-1-yl)acetate (AIZ-1), 2-(3-(1-carboxyethyl)-1H-imidazol-3-ium-1-yl)propanoate (AIZ-2) and 2-(3-(1-carboxy-2-phenylethyl)-1H ... -
Ammonia-oxidizing microorganisms: key players in the promotion of plant growth
(Instituto de Agroindustria, 2017)Nitrogen (N) is the most important mineral nutrient required by plants. Although some plants can directly utilize N, ammonium (NH4+) and nitrate (NO3-) are the only forms of N that are usable to most plants. Ammonia-oxidizing ... -
Ammonium sulphate and/or ammonium bisulphate as extracting agents for the recovery of aluminium from ultrafine coal fly ash
(Elsevier, 2017)We recently showed that the selective extraction of aluminium from the amorphous phase of a South African ultrafine coal fly ash can be achieved via thermochemical treatment with ammonium sulphate for 1 h followed by aqueous ... -
Amphibian chytrid fungus in Africa – realigning hypotheses and the research paradigm
(Wiley, 2020)The amphibian chytrid fungus Batrachochytrium dendrobatidis (Bd), responsible for numerous amphibian declines and extinctions, was previously thought to originate from the African continent. This was based on infected ... -
Amphibian fungal panzootic causes catastrophic and ongoing loss of biodiversity
(AAAS, 2019)Rapid spread of disease is a hazard in our interconnected world. The chytrid fungus Batrachochytrium dendrobatidis was identified in amphibian populations about 20 years ago and has caused death and species extinction at ... -
Amphibian skin defences show variation in ability to inhibit growth of Batrachochytrium dendrobatidis isolates from the Global Panzootic Lineage
(Microbiology Society, 2017)The fungal pathogen Batrachochytrium dendrobatidis has caused declines and extinctions in hundreds of amphibian species across the world. Virulence varies among and within lineages; the Global Panzootic Lineage (GPL) is ... -
Amphibian survey and current absence of Batrachochytrium dendrobatidis (Bd) in Ivoloina Park, Toamasina (eastern Madagascar)
(Taylor & Francis, 2014)Amphibians are threatened globally by the chytridiomycete fungus Batrachochytrium dendrobatidis (Bd), which is still expanding in range. Madagascar, rich in amphibian diversity, remains one of the few places that the fungus ... -
Amphibian symbiotic bacteria do not show a universal ability to inhibit growth of the global panzootic lineage of Batrachochytrium dendrobatidis
(Amer Soc Microbiology, 2015)Microbiomes associated with multicellular organisms influence the disease susceptibility of hosts. The potential exists for such bacteria to protect wildlife from infectious diseases, particularly in the case of the globally ... -
Amphibiophilus mooiensis n. sp. (Nematoda: Amphibiophilidae), a parasite of Amietia delalandii (Duméril & Bibron) (Amphibia: Pyxicephalidae) from South Africa
(Springer, 2018)Four species of the genus Amphibiophilus Skrjabin, 1916 from pyxycephalid frogs in southern and central Africa are currently recognised as valid. Several specimens of Amphibiophilus were found in material from the common ...