Faculty of Science: Recent submissions
Now showing items 161-180 of 381
-
Tylosema esculentum extractives and their bioactivity
(Elsevier Science Ltd, http://www.elsevier.com/locate/bmc, 2011)The investigation of Tylosema esculentum (Morama) husks, cotyledons, and tuber yielded griffonilide 2, compound 1, griffonin 3, gallic acid 4, protocatechuic acid 5, b-sitosterol 6, behenic acid 7, oleic acid 8, sucrose ... -
A bichalcone from the twigs of Rhus pyroides
(Elsevier Science Ltd, http://www.elsevier.com/locate/phytochem, 2000)The twigs of Rhus pyroides yielded a novel bichalcone 2',40,21-trihydroxy-4',41-dimethoxy-4-O-51-bichalcone. It was identified on the basis of spectroscopic data including 1D and 2D NMR spectroscopy. The name rhuschalcone-1 ... -
An efficient synthesis of flavans from salicylaldehyde and acetophenone derivatives
(Elsevier Science Ltd, http://www.elsevier.com/locate/tetlet, 2011)An efficient total synthesis of flavans from the reactions of salicylaldehyde and acetophenone derivatives is reported. The synthesis involves preparation of chalcones through an aldol reaction followed by reduction of ... -
An unexpected 1,2-hydride shift in phosphoric acid-promoted cyclodimerization of styrene oxides under solvent-free conditions. A synthetic route towards 2,4-disubstituted 1,3-dioxolanes
(Elsevier Science Ltd, http://www.elsevier.com/locate/tetlet, 2009)A 1,2-hydride shift in the phosphoric acid-promoted cyclodimerization of styrene oxide and its chloro derivatives under solvent-free conditions leading to 2,4-disubstituted 1,3-dioxolanes is described. Methoxy substituents ... -
Pollution implications of Save River water from weathering and dissolution of metal hosting minerals at Dorowa phosphate mine, Zimbabwe
(Elsevier Science Ltd, http://www.elsevier.com/locate/pce, 2010)The study set out to determine the weathering and dissolution of metal hosting minerals at Dorowa for purposes of deducing pollution potential to the nearby Save River. Phosphate rock is mined at Dorowa for the production ... -
Problems and prospects for the development of urban tourism in Gaborone and Maun, Botswana
(Taylor & Francis (Routledge), http://www.informaworld.com/smpp/title~content=t713413745, 2007-12)This paper draws on the tourism system framework to examine the problems and prospects of urban tourism in Gaborone and Maun, Botswana. These are young centres that have a growing number of tourist attractions, facilities ... -
Intergenerational bargaining and wealth flows in the era of HIV/AIDS: emerging trends in Old Naledi-Gaborone, Botswana
(Taylor & Francis (Routledge), http://jir.ucsur.pitt.edu/, 2008)Based on the intergenerational wealth flows conceptual framework, this paper investigates how the AIDS pandemic threatens to disrupt the transfer of resources between generations by using a typical low income urban area ... -
Hepatoprotective potentials of water extract of Bauhinia purpurea bark against alcohol induced toxicity
(Academic Journals, http://www.academicjournals.org/SRE, 2011)Bark of Bauhinia purpurea tree was collected and both the water and methanol extracts were prepared. Both extracts were tested for free radical scavenging activities and phenol content. Water extract was then tested for ... -
Effect of Momordica charantia on lipid profile and oral glucose tolerance in diabetic rats
(John Wiley & Sons, Ltd, http://onlinelibrary.wiley.com/journal/10.1002/(ISSN)1099-1573, 2004)In this study, the methanol extract of Momordica charantia fruit extract was administered to diabetic rats to assess the long term effect of the extract on the lipid profile and the oral glucose tolerance test. Treatment ... -
Analysis of persistence soil nutrient statusin abandoned cattle kraals in a semi arid area of Botswana
(Academic Journals, http://www.academicjournals.org, 2011-12-04)The aim of this study was to analyze the depletion of soil nutrients with time on abandoned kraals in a peri-urban area of Botswana. Active kraals are enriched with nutrients through the accumulation of animal droppings ... -
Residual effects of prolonged UV-B exposure on photosynthetic gene expression
(Academic Journals, www.academicjournals.org, 2010-08-18)Residual long-term effects of increased UV-B radiation were investigated in an indigenous plant species, Dimorphotheca sinuata, by analysing photosynthetic gene expression. Reductions were observed in the amount of the ... -
Determination of allele frequencies in nine short tandem repeat loci of five human sub-populations in Botswana
(Academic Journals, www.academicjournals.org, 2008-04-17)Allele frequencies for nine short tandem repeat (STR) loci from the AmpFlSTR® Profiler Plus PCR Amplification Kit were determined in five subpopulations across Botswana and tested for suitability for use in individual ... -
Comparative assessment of water infiltration of soils under different tillage systems in eastern Botswana
(Elsevier Science Ltd, http://www.elsevier.com/locate/pce, 2009)Water infiltration is an important component of water balance for improving crop production potential in dryland soil tillage systems in Botswana, particularly in the eastern region. Hardsetting soils common in arable ... -
Use of neutron probe and tensiometry techniques in determining water characteristics of the two soil types
(University of Botswana, Faculty of engineering and technology, http://www.ajol.info/index.php/bjt/index, 2008)Characterisation of soil water, in particular water flow dynamics is fundamental in assessing the environmental implications to soil management. Soil water characterisation was assessed by measuring soil water content and ... -
Carriage of micro-organisms by domestic cockroaches and implications on food safety
(ICIPE - African Insect Science for Food and Health, http://journals.cambridge.org/action/displayJournal?jid=JTI, 2006)Domestic cockroaches Blattella germanica were trapped from various homes in Gaborone, Botswana using ‘Dyroach’ traps. Isolations of bacteria, yeasts and moulds were done on external body parts and on the faecal pellets ... -
Vector measures of bounded semivariation and associated convolution operators
(Glasgow Mathematical Journal Trust, http://journals.cambridge.org/action/displayJournal?jid=GMJ, 2011)Let G be a compact metrizable abelian group, and let X be a Banach space. We characterize convolution operators associated with a regular Borel X-valued measure of bounded semivariation that are compact (resp; weakly ... -
Chicken manure-enhanced soil fertility and productivity: effects of application rates
(Academic Journals, http://www.academicjournals.org/JSSEM, 2010-05)The utilization of chicken manure as an organic fertilizer is essential in improving soil productivity and crop production. We carried out the study to assess the effects of chicken manure on soil chemical properties and ... -
Comparative effects of secondary treated waste water irrigation on soil quality parameters under different crop types
(Global Science Books, http://www.globalsciencebooks.info/Journals/AJPSB.html, 2011)This study compares soil quality parameters, and salinity and heavy metal levels in soils cultivated with different crops under secondary treated wastewater irrigation in the Glen Valley, near Gaborone City, Botswana. The ... -
Prevalence, antimicrobial resistance profiles of Listeria monocytognes from various foods in Gaborone, Botswana
(Academic Journals, http://www.academicjournals.org/AJB, 2009)Listeria monocytogenes is known to cause epidemic and sporadic cases of listeriosis. The present study investigated the occurrence, antibiograms and molecular serotypes of the organism in various retail outlets in Gaborone, ... -
Soil resources distribution, woody plant properties and land use in a lunette dune-pan system in Kalahari, Botswana
(Academic Journals, http://www.academicjournals.org/SRE, 2008)The distribution of selected soil properties, selected woody vegetation properties, and land use in a lunette dune-pan system were investigated in the Sekoma area, which is located within the IGBP Kalahari Transect (KT) ...