Browsing Faculty of Natural and Agricultural Sciences by Title
Now showing items 4581-4600 of 4817
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Ueda’s peak set theorem for general Von Neumann algebras
(AMS, 2018)We extend Ueda’s peak set theorem for subdiagonal subalgebras of tracial finite von Neumann algebras to σ-finite von Neumann algebras (that is, von Neumann algebras with a faithful state, which includes those on a separable ... -
The UEFA model in identification of types, severity and mechanism of injuries among professional footballers in the Nigerian Premier League
(Health and Medical Publishing Group (HMPG), 2015)Background. Association football, otherwise known as soccer, is the most popular sport in the world. The increase in the popularity of the game and the expectations from players make injury risk in football high. Objective. ... -
Ultramafic geoecology of South and Southeast Asia
(Springer, 2017)Globally, ultramafic outcrops are renowned for hosting floras with high levels of endemism, including plants with specialised adaptations such as nickel or manganese hyperaccumulation. Soils derived from ultramafic regoliths ... -
Ultramafic vegetation and soils in the circumboreal region of the Northern Hemisphere
(Wiley, 2018)The paper summarizes literature on climate, soil chemistry, vegetation and metal accumulation by plants found on ultramafic substrata in the circumboreal zone (sensu Takhtajan, Floristic regions of the world, 1986) of the ... -
Ultrasound assisted synthesis of chalcones as green corrosion inhibitors for mild steel in 1M hydrochloric solution
(ESG, 2014)The three chalcones namely (E)-3-(4-hydroxyphenyl)-N-phenylacrylamide (INH-1), (E)-3- (4dimethylamino)phenyl)-N-phenylacrylamide (INH-2) and (E) -3-(4-hydroxy-3-methoxyphenyl)-Nphenylacrylamide (INH-3) were synthesized ... -
Ultrastructural comparison of Hepatozoon ixoxo and Hepatozoon theileri (Adeleorina: Hepatozoidae), parasitising South African Anurans
(Wiley, 2017)To date, only two haemogregarine parasite species have been described from South African anurans: Hepatozoon ixoxo, infecting toads of the genus Scler- ophrys (syn. Amietophrynus); and Hepatozoon theileri, parasitising ... -
Ultrastructure of the uterus, embryonic envelopes and the coracidium of the enigmatic tapeworm Tetracampos ciliotheca (Cestoda: Bothriocephalidea) from African sharptooth catfish (Clarias gariepinus)
(Springer, 2020)Transmission electron microscopy (TEM) was used to study the ultrastructure of the uterus and egg morphology in the enigmatic bothriocephalidean tapeworm Tetracampos ciliotheca. The uterine wall, underlain by well-developed ... -
The ultraviolet upturn in brightest cluster galaxies
(Wiley, 2011)This paper is part of a series devoted to the investigation of a large sample of brightest cluster galaxies (BCGs), their properties and the relationships between these properties and the properties of the host clusters. ... -
Unbalanced biotransformation metabolism and oxidative stress status: implications for deficient fatty acid oxidation
(Scientific Research, 2011)The concept of accumulating xenobiotics within the human body as a health risk is well known. However, these compounds can also be endo-genous, as in the case of inborn errors of me-tabolism, and lead to some of the same ... -
Uncertainties implicit to the use of the force-field solutions to the Parker transport equation in analyses of observed cosmic ray antiproton intensities
(APS, 2020)Spacecraft observations of cosmic ray antimatter intensities can potentially shed new light on previously unknown physics and hence play an essential role in the search for dark matter. At lower energies, however, these ... -
Uncertainty of dustfall monitoring results
(NACA, 2017)Fugitive dust has the ability to cause a nuisance and pollute the ambient environment, particularly from human activities including construction and industrial sites and mining operations. As such, dustfall monitoring has ... -
Uncovering a hidden diversity: two new species of Breviceps (Anura: Brevicipitidae) from northern KwaZulu-Natal, South Africa
(Magnolia Press, 2017)Breviceps carruthersi sp. nov. and Breviceps passmorei sp. nov. are described from northern KwaZulu-Natal. Both new species are distinguished from B. adspersus, B. mossambicus, B. poweri and B. cf. sopranus by substantial ... -
Uncovering the metabolic response of abalone (Haliotis midae) to environmental hypoxia through metabolomics
(Springer, 2018)Introduction Oxygen is essential for metabolic processes and in the absence thereof alternative metabolic pathways are required for energy production, as seen in marine invertebrates like abalone. Even though hypoxia has ... -
Undergraduate students’ perceptions of factors affecting job satisfaction
(AOSIS, 2018)Orientation: Globally, people engage in work and sell their services to an organisation in exchange for compensation. This compensation can have a significant effect on employees’ attitude towards their work, resulting in ... -
Understanding community perceptions of an urban stream before and after a discussion of revitalization possibilities using photo-elicitation
(Springer, 2020)Understanding local community perceptions is an important first step in seeking ways to revitalize degraded urban streams. This research sought to understand community perceptions of the highly modified Parnamirim stream ... -
Understanding factors structuring zooplankton and macroinvertebrate assemblages in ephemeral pans
(Elsevier, 2017)Ephemeral aquatic ecosystems have a global distribution being most abundant in semi-arid and arid regions. Due to anthropogenic impacts threatening these environments, there is a need to understand various factors and ... -
Understanding future changes in tropical cyclogenesis using Self-Organizing Maps
(Elsevier, 2019)Future changes in tropical cyclone (TC) genesis locations and frequency are explored by identifying relationships between TC genesis and dominant daily large-scale patterns, and evaluating the strength of these relationships ... -
Understanding gender dimensions of climate-smart agriculture adoption in disaster-prone smallholder farming communities in Malawi and Zambia
(Emerald, 2019)Purpose Through the application of traditional and contemporary feminist theories in gender mainstreaming, the purpose of this paper is to contribute to emergent debate on gender dimensions in climate-smart agriculture ... -
Understanding growth relationships of African cymothoid fish parasitic isopods using specimens from museum and field collections
(Elsevier, 2019)Cymothoid isopods are a diverse group of ectoparasites of fish species, and are particularly conspicuous as they are large and attach to the body surface, mouth, and gill chamber of fish hosts. These parasites transition ... -
An understanding of the porosity of residual coal/char/ash samples from an air-blown packed bed reactor operating on inertinite-rich lump coal
(Elsevier, 2012)The thermal treatment of coal causes a development of internal porosity of the resultant char due to the changes in the coal char pores, i.e. the opening of original closed pores, the formation of new pores, and an increase ...
