Browsing Faculty of Natural Sciences by Title
Now showing items 1785-1804 of 1887
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UBV(RI)C JHK observations of Hipparcos-selected nearby stars
(Oxford University Press, 2010)We present homogeneous, standardized UBV(RI)C photometry for over 700 nearby stars selected on the basis of Hipparcos parallaxes. Additionally, we list JHK photometry for about half of these stars, as well as L photometry ... -
UBV(RI)C photometry of transiting planet hosting stars
(Oxford University Press, 2011)We present new UBV(RI)C photometry of 22 stars that host transiting planets, 19 of which were discovered by the Wide Angle Search for Planets (WASP) survey. We use these data together with Two Micron All Sky Survey (2MASS) ... -
UDCA: Energy optimization in wireless sensor networks using uniform distributed clustering algorithms
(Academic Journals Inc., 2011)Transceivers are the major energy consumption in a Wireless Sensor Network which is made of low-power, small in size, low cost and multi-functional nodes. These sensor nodes are operated by batteries which put significant ... -
An unconditionally stable nonstandard finite difference method to solve a mathematical model describing Visceral Leishmaniasis
(Elsevier, 2021)In this paper, a mathematical model of Visceral Leishmaniasis is considered. The model incorporates three populations, the human, the reservoir and the vector host populations. A detailed analysis of the model is presented. ... -
Under-5 Mortality in Tanzania: a demographic scenario
(Tehran University of Medical Sciences, 2012)Background: The government of the United Republic of Tanzania has initiated the Integrated Management of Childhood Illness program to improve the health and wellbeing of children. Methods: Tanzania’s under-five mortality ... -
Undergraduate antimicrobial stewardship training for pharmacy students: Creating a foundation for containment of antimicrobial resistance in South Africa
(Health and Medical Publishing Group, 2017)To the Editor: The inappropriate and excessive use of antimicrobial agents has cultivated the development and progression of antimicrobial resistance worldwide, which has been recognised as a threat to global health and ... -
Understanding human coronavirus HCoV-NL63
(Bentham Science, 2010)Even though coronavirus infection of humans is not normally associated with severe diseases, the identification of the coronavirus responsible for the outbreak of severe acute respiratory syndrome showed that highly ... -
Understanding issues of people living with disabilities in South Africa
(SAGE Publications, 2013)The problem of disabilities is growing all over the world. Nevertheless, some progress has been made since the year 1981 was proclaimed International Year of Disabled Persons. In 2001 people living with disabilities accounted ... -
Understanding the epidemiology, pathophysiology, diagnosis and management of SARS-CoV-2
(SAGE, 2020)The emergence of coronavirus disease 2019 (COVID-19) in December 2019 has resulted in over 20 million cases and 741,808 deaths globally, affecting more than 200 countries. COVID-19 was declared a pandemic on 11 March 2020 ... -
Understanding the spatial distribution of eroded areas in the former rural homelands of South Africa: Comparative evidence from two new non-commercial multispectral sensors
(Elsevier, 2018)In this study, we determine the most suitable multispectral sensor that can accurately detect and map eroded areas from other land cover types in Sekhukhune rural district, Limpopo Province, South Africa. Specifically, the ... -
A uniquely African focus: bioinformatics is a field that has grown exponentially in the past few years, and it is becoming increasingly important to collaborate as the field continues to gather momentum
(2015)Bioinformatics is a field that has grown exponentially in the past few years, and it is becoming increasingly important to collaborate as the field continues to gather momentum. -
Unlocking community capabilities across health systems in low- and middle-income countries: lessons learned from research and reflective practice
(BioMed Central, 2016)The right and responsibility of communities to participate in health service delivery was enshrined in the 1978 Alma Ata declaration and continues to feature centrally in health systems debates today. Communities are a ... -
Unmasking community trust issues in rural field work
(ACM, 2013)The principal objective of this paper is to describe the au thor's fieldwork and research in a remote rural area of South Africa, where a Village Telco is deployed to provide Voice over Internet Protocol on a wireless mesh ... -
Unmet need for family planning and barriers to contraceptive use in Kaduna, Nigeria: culture, myths and perceptions
(Taylor & Francis, 2020)In 2017, just one-fifth of all married women of reproductive age reported using contraception in Kaduna state, Nigeria, while many more experienced unmet need for contraception. These realities drive risky fertility ... -
Unraveling the diversification and systematic puzzle of the highly polymorphic Psammobates tentorius (Bell, 1828) complex (Reptilia: Testudinidae) through phylogenetic analyses and species delimitation approaches
(Wiley-Blackwell, 2020)The high level of phenotypic diversity in southern African tent tortoises (Psammobates tentorius complex) has for decades prevented systematists from developing a stable taxonomy for the group. Here, we used a comprehensive ... -
Unsupervised machine learning for transient discovery in deeper, wider, faster light curves
(Oxford University Press, 2020)Identification of anomalous light curves within time-domain surveys is often challenging. In addition, with the growing number of wide-field surveys and the volume of data produced exceeding astronomers’ ability for manual ... -
An unusual 2,3-secotaraxerene and other cytotoxic triterpenoids from pleiocarpa pycnantha (apocynaceae) leaves collected from Nigeria
(MDPI, 2014)Three known triterpenoids, namely ursolic acid (1), and the 27-E- and 27-Z-pcoumaric esters of ursolic acid (compounds 2, 3), were isolated together with a new triterpene 2,3-seco-taraxer-14-en-2,3-lactone [pycanocarpine ... -
An unusual 2,3-secotaraxerene and other cytotoxic triterpenoids from pleiocarpa pycnantha (apocynaceae) leaves collected from Nigeria
(MDPI, 2014)Three known triterpenoids, namely ursolic acid (1), and the 27-E- and 27-Z-pcoumaric esters of ursolic acid (compounds 2, 3), were isolated together with a new triterpene 2,3-seco-taraxer-14-en-2,3-lactone [pycanocarpine ... -
An update on the techniques used to measure oxidative stress in seminal plasma
(Blackwell Publishing Ltd, 2021)Reactive oxygen species (ROS) are produced in significant amounts by spermatozoa and leucocytes. They are necessary to carry out various physiological functions such as sperm capacitation, hyperactivation, acrosome reaction, ... -
Updates and advances to the FAO56 crop water requirements method
(Elsevier, 2021)This study reviews the abundant research on FAO56 crop coefficients, published following introduction ofthe FAO56 paper in 1998. The primary goal was to evaluate, update, and consolidate the mid-season andend-season single ...
