Browsing Faculty of Science by Title
Now showing items 21-40 of 381
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Antimicrobial activity of the methanolic extracts and compounds from Treculia obovoidea (Moraceae)
(Elsevier Ireland Ltd. www.elsevier.com/locate/jethpharm, 2007)The crude extract from Treculia obovoidea was subjected to purification by repeated chromatography. Eight compounds were isolated from Treculia obovoidea and identified as Psoralen (1), Bergapten (2), 7-methoxycoumarin ... -
Antimicrobial and antioxidant flavonoids from the root wood of Bolusanthus speciosus
(Elsevier Ltd. www.elsevier.com/locate/phytochem, 2004)Three new flavonoids-5,7,4'-trihydroxy-6-[1-hydroxy-2-methylbuten-2-yl]isoflavone (isogancaonin C), 7,2'-dihydroxy-4'-methoxyisoflav- 3-ene (bolusanthin III), 6,6'-dihydroxy-4'-methoxy-2-arylbenzofuran (bolusanthin IV), ... -
Antimicrobial and radical scavenging flavonoids from the stem wood of Erythrina latissima
(Elsevier Ltd; http://www.elsevier.com/wps/find/journaldescription.cws_home/273/description, 2004-11-20)From the stem wood of Erythrina latissima, two isoflavones and a flavanone were isolated and characterized as 7,3'-dihydroxy-4'-methoxy-5'-(y,y-dimethylallyl)isoflavone (erylatissin A), 7,3'-dihydroxy-6".6"-dimethyl-4".5 ... -
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 ... -
Antinociceptive and anti-inflammatory effects of Dorstenia barteri (Moraceae) leaf and twig extracts in mice
(Elsevier Ltd. www.elsevier.com/locate/jethpharm, 2004)The present studywas undertaken to investigate the antinociceptive and anti-inflammatory activities of the leaf and twig extracts of Dorstenia barteri (Moraceae) in mice. Both the leaf and twig extracts of Dorstenia barteri ... -
Antioxidant activity of prenylated flavonoids from the West African medicinal plant Dorstenia mannii
(Elsevier Science Ireland Ltd. www.elsevier.com/locate/jethpharm, 2003)The antioxidant activities of three prenylated flavonoids from Dorstenia mannii (6,8-diprenyleriodictyol, dorsmanin C and dorsmanin F) were compared to the common, non-prenylated flavonoid, quercetin. The prenylated ... -
Antioxidant and antibacterial constituents from Morus nigra
(Academic Journals, http://www.academicjournals.org/ajpp, 2011-06)The objective of this study was to isolate and characterize the constituents of the local Morus nigra L. (Black mulberry), to compare its constituents with other studied Mulberries and to evaluate its antioxidative and ... -
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 ... -
Antitrichomonal and antioxidant activities of Dorstenia barteri and Dorstenia convexa
(Brazilian Journal of Medical and Biological Research. http://www.scielo.br/scielo.php?pid=0100-879X&script=sci_serial, 2005)Dorstenia barteri and D. convexa extracts and some isolated components of the former were investigated for effectiveness against Trichomonas gallinarum and compared with quercetin and quercitrin. The antioxidant activity ... -
Application of Geoelectrical Resistivity Method to the Assessment of Groundwater Pollution: A case Study of Onibu-Eja Active Open Dumpsite, Osogbo, Southwestern Nigeria
(World Academic Publishing, www.academicpub.org/, 2016)Electrical resistivity methods using the dipole – dipole array and Schlumberger Vertical Electrical Sounding (VES) techniques were conducted at the Onibu-Eja active open Dumpsite, Osogbo, Southwestern Nigeria in assessing ... -
Assessing acceptance of adaptive educational hypermedia systems: prior knowledge vs. cognitive styles
(International Journal of Computer Science Issues, http://www.ijcsi.org/index.php, 2012)Perceived usefulness and ease of use have proved to be key determinants of the acceptance and usage of e-learning systems. On the contrary, little is known about students' perceptions in Adaptive Educational Hypermedia ... -
Assessing the effectiveness of locally available fungicides in managing Cercospora leaf spot of Swiss chard under field conditions in Botswana
(Centre for Info Bio Technology, http://www.cibtech.org/, 2017)Cercospora leaf-spot (CLS), caused by Cercospora beticola, is an important foliar disease of Swiss chard in Botswana. The regularity of outbreaks of the disease in Botswana is a major cause of concern and thus, have ... -
Assessment of diversity in Harpagophytum with RAPD and ISSR markers provides evidence of introgression
(Mendelian Society of Lund, http://www.hereditasjournal.com/, 2014)The genus Harpagophytum has two species: H. procumbens which is an important medicinal plant in southern Africa, and H. zeyheri. Genetic diversity in 96 samples, obtained by germinating seeds collected from Botswana, was ... -
Assessment of groundwater pollution vulnerability and modelling of the Kanye Wellfield in SE Botswana—a GIS approach
(Elsevier Science Ltd, http://www.elsevier.com/locate/pce, 2004)Botswana is a semi-arid country with limited recharge to groundwater resources. Groundwater however is a major source of water for domestic, industrial and agricultural uses. There is therefore the need to ensure that the ... -
Assessment of heavy metal pollution/contamination in soils east and west of the Bamangwato Concessions Ltd (BCL) Cu/Ni mine smelter in Selebi-Phikwe, Botswana
(International Network for Natural Sciences (INNSPUB), http://www.innspub.net, 2015)The current study evaluated the concentration and levels of pollution by heavy metals in soils around BCL Cu/Ni mine in Selebi-Phikwe, Botswana. Soil samples were collected from four different locations namely 2.5 km east, ... -
An assessment of Prosopis L. in the Bokspits Area, South-Western Botswana, based on Morphology
(Global Science Books, http://www.globalsciencebooks.info/, 2011)The genus Prosopis comprises 44 species. Extensive introgression and hybridization is suspected in the genus, which makes identification of the species very difficult. Accurate identification of the species is crucial in ... -
Assessment of the concentration of heavy metals associated with landfill leachate in Gamodubu soils in the Kweneng District, Botswana
(International Scholars Journals, http://internationalscholarsjournals.org/journal/ajss/home, 2019-01)Composting is a common method of household waste in developing countries such as Botswana. However, compost can introduce heavy metals which are harmful to the environment. High concentrations of heavy metals are toxic ... -
Assessment of vegetation indexes useful for browse (forage) prediction in semi-arid rangelands
(Taylor and Francis http://www.clas.ufl.edu/lueci/southworth/RS-class-advanced/Discussion-readings/Moleele%20et%20al%202001%20Assessment%20of%20veg%20indexes%20i.pdf, 2001)Considerable signi® cance is placed on the mapping and monitoring of degraded areas in semi-arid regions of the world, including Botswana. Degraded areas include those suVering from bush encroachment, believed to result ... -
Basement control on dyke distribution in Large Igneous Provinces: Case study of the Karoo triple junction
(Elsevier www.elsevier.com/locate/epsl, 2006)Continental flood basalts consist of vast quantities of lava, sills and giant dyke swarms that are associated with continental break-up. The commonly radiating geometry of dyke swarms in these provinces is generally ... -
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 ...