Faculty of Science: Recent submissions
Now showing items 21-40 of 381
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Analysis of temperature data over semi-arid Botswana: trends and break points
(Springer Nature Switzerland AG. Part of Springer Nature., https://www.springer.com/journal/703, 2018)Climate change is a global challenge which impacts negatively on sustainable rural livelihoods, public health and economic development, more especially for communities in Southern Africa. Assessment of indices that signify ... -
Nondestructive measurement of momentum transfer collision frequency for low temperature combustion plasma
(Hindawi Publishing Corporation, https://www.hindawi.com/journals/ijap/, 2014)Accurately measured momentum transfer collision frequency and electron density for fire plasma enable correct simulation of electromagnetic wave propagation in the medium. The simulation is essential for designing ... -
An empirical relation for vegetation fuel flames breakdown electric field strength
(Scientific Research Publishing Inc., https://www.scirp.org/journal/jemaa/, 2019)The compulsion to provide reliable electric power for sustenance of socio-economic development is vital for most of southern Africa states. The demand for the resource in the region is anticipated to escalate in the next ... -
Transboundary pollution in the Capital City of Botswana
(Infogain Publication, https://ijeab.com/, 2016-09)This paper presents aerosol studies carried out in the capital city of Botswana. The use of backward air mass trajectories has shown that elevated concentrations of fine particles correspond to situations when the air mass ... -
Status of air pollution in Botswana and significance to air quality and human health
(Pure Earth (formerly Blacksmith Institute), www.pureearth.org, 2017-09-01)Background. Air pollution is an important issue in developed and industrialized countries. The most common sources of air pollution are anthropogenic activities such as construction dust, vehicular emissions and mining. ... -
Radio wave propagation experiment in sugarcane fire environments
(Scientific Research Publishing Inc., https://www.scirp.org/journal/jemaa/, 2016-07-21)Large fires have an effect of suppressing Very or Ultra High Frequency (VHF/UHF) radio wave signals strength which consequently impact negatively on the efficiency of radio communications at the frequency ranges. Mobile ... -
Investigating the applicability of nexus thinking to private protected areas; the case of Mokolodi Nature Reverse, Southeast Botswana
(University of Botswana, www.ub.bw, 2019-09)World-wide, Community Based Natural Resources Management (CBNRM) has gained international attention for reconciling common pool resource management with needs and aspirations of the local people. Regionally, Zimbabwe’s ... -
Isolation and characterization of Lactic Acid Bacteria and indicator microorganisms of food safety from Omaere, a traditionally fermented milk product in Botswana
(University of Botswana, www.ub.bw, 2018)Botswana has many traditional foods and beverages that are prepared by means of natural/spontaneous fermentation. The traditional preparation of these foods is for the most part largely undocumented and the microorganisms ... -
Some relations between admissible monomials for the polynomial algebra
(Hindawi Publishing Corporation, www.Hindawi.com, 2015)Let P(𝑛) = F2[𝑥1, . . . , 𝑥𝑛] be the polynomial algebra in 𝑛 variables 𝑥𝑖, of degree one, over the field F2 of two elements. The mod-2 Steenrod algebra A acts on P(𝑛) according to well known rules. A major problem ... -
Biosynthesis of silver nanoparticles with potent antimicrobial activity using lactic acid bacteria
(Society for Advance Healthcare Research, http://www.ejbps.com/, 2019-03)In this study, Lactic Acid Bacteria isolated from traditional fermented foods were screened for the synthesis of silver nanoparticles. Antimicrobial activity of the synthesized nanoparticles was assayed against several ... -
GC-MS analysis and preliminary antimicrobial activity of albizia adianthifolia (Schumach) and pterocarpus angolensis (DC)
(MDPI, https://www.mdpi.com/, 2016-01-29)The non-polar components of two leguminoceae species Albizia adianthifolia (Schumach), and Pterocarpus angolensis (DC) were investigated. GC-MS analysis of the crude n-hexane and chloroform extracts together with several ... -
Antimicrobial Flavonoids from Bolusanthus speciosus
(Georg Thieme Verlag, https://www.thieme.com/, 2002)A new isoflavanone namely 3,5,7,2′,4′-pentahydroxy-8,3′-di(γ,γ-dimethylallyl)isoflavanone (bolusanthin II) and four new pterocarpans identified as 3-hydroxy-6′,6′-dimethylpyrano[2′,3′:1,2] [6aR,11aR]-8,9-methylenedioxypterocarpan ... -
Phenolic and antibacterial constituents of Vahlia capensis
(Georg Thieme Verlag, https://www.thieme.com/books-main/biochemistry/product/3494-planta-medica, 1997)The n-butanol fraction of Vahlia capensis yielded kaempferol, quercetin, afzelin, astragalin, quercitrin, iso-quercitrin, rutin, gallic acid, chiro-inositol, dulcitol, and a novel biflavonoid, VC-15B (vahlia biflavone). ... -
Bufadienolides and other constituents of Urginea sanguinea
(Georg Thieme Verlag, https://www.thieme.com/books, 1997)Fresh bulbs of Urginea sanguinea yielded stigmasterol, phloroglucinol, phloroglucinol 1-β-D-glucopyranoside (phlorin), scillaren A, a novel compound 5α-4,5-dihydroscillaren A (1), salicylic acid, and 3-hydroxy-4-methylbenzoic ... -
Erythrinaline Alkaloids and Antimicrobial Flavonoids from Erythrina latissima
(Georg Thieme Verlag, https://www.thieme.com/books-main/biochemistry/product/3494-planta-medica, 2002)The seed pods of Erythrina latissima yielded erysotrine, erysodine, syringaresinol, vanillic acid, a new erythrina alkaloid, (+)-10,11-dioxoerysotrine, which was lethal to brine shrimp and 2-(5′-hydroxy-3′-methoxy ... -
Antioxidant and antidiabetic potential of Myrothamnus flabellifolius found in Botswana
(Cogent OA, https://www.cogentoa.com/journal/biology, 2016-12-29)The total phenol content, antioxidant and antidiabetic activity of Myrothamnus flabellifolius (MF) were investigated. The study revealed 70% ethanol/water (EW70), 70% methanol/water (MW70) and methanol (Me) extracts to ... -
Antibiotic activity of selected Botswana Medicinal Plants
(The Botswana Society, http://journals.ub.bw/index.php/bnr/index, 1998)A number of plant extracts from selected Botswana Medicinal Plants were tested against a battery of organisms for antibiotic activity. The antibiotic profile for most of these extracts seems to support their traditional ... -
Fatty acid composition and antimicrobial activity of Baphia massaiensis seed oil
(SCIENCEDOMAIN International, http://www.journaljocamr.com/index.php/JOCAMR/index, 2017-04-03)Aims: The seed oil composition of Baphia massaiensis seeds was determined using 1H NMR and GC-MS techniques. The seed oil was also screened for antimicrobial activity. Study Design: The study was designed to determine ... -
Electron states in a sinusoidally deformed cylindrical quantum wire
(Springer Nature Switzerland AG. Part of Springer Nature, https://link.springer.com/journal/40094, 2017)Electron states in a sinusoidally deformed cylindrical nanowire are probed within the effective mass approximation. The nanowire is immersed in a homogeneous magnetic field applied parallel to the axis of the wire. The ... -
Communication: Remarkable electrophilicity of the oxalic acid monomer: An anion photoelectron spectroscopy and theoretical study
(AIP Publishing LLC., https://aip.scitation.org/journal/jcp, 2014-06-14)Our experimental and computational results demonstrate an unusual electrophilicity of oxalic acid, the simplest dicarboxylic acid. The monomer is characterized by an adiabatic electron affinity and electron vertical ...