University of Botswana Research, Innovation and Scholarship Archive: Recent submissions

Now showing items 2041-2060 of 2188

  • Characterization and Compositional Studies of the Oils from Some Legume Cultivars, Phaseolus vulgaris, Grown in Southern Africa 

    Mabaleha, M.B.; Yeboah, S.O. (AOCS Press., 2004)
    Seed oils from six legume cultivars of Phaseolus vulgaris, grown in the Kingdom of Lesotho, were extracted and their physicochemical properties and FA compositions were determined in order to compare their dietary lipids ...

  • From nature, through chemical synthesis, toward use in agriculture: Oryzoxymycin case study 

    Bwire, R N; Majinda, R R; Masesane, I B; Steel, P G (International Union of Pure and Applied Chemistry. http://stage.iupac.org/publications/pac/, 2009)
    The Diels–Alder adducts of ethyl (E)-3-nitroacrylate and furan provided a common and versatile template for the stereocontrolled synthesis of an isomer of the natural product oryzoxymycin and polyhydroxylated cyclohexyl ...

  • Epoxylignans from the seeds of Centaurea cyanus (Asteraceae) 

    Shoeb, M.; Jaspars, M.; MacManus, S.M.; Majinda, R.R.T.; Sarker, S.D. (Elsevier Ltd. www.elsevier.com/locate/biochemsyseco, 2004)
    A study focusing on Centaurea cyanus L. (family: Asteraceae alt. Compositae), otherwise known as "cornflower" or "bachelor's button. The seed is purchased from B & T World Seeds sarl, Pauguignan, 34210 Olonzac, France and ...

  • Antimicrobial and antioxidant flavonoids from the root wood of Bolusanthus speciosus 

    Erasto, P.; Bojase-Moleta, G.; Majinda, R.T. (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), ...

  • Measuring business performance: A case study 

    Garg, A.K.; Joubert, R.J.O.; Pellissier, R. (College of Economic and Management Sciences, University of South Africa. http://www.unisa.ac.za/default.asp?Cmd=ViewContent&ContentID=16434, 2004)
    Most studies consider business performance to be a multidimensional construct. Four dimensions (namely, business growth, profitability, image and customer loyalty, and product service innovativeness) were hypothesised ...

  • Platinum Group of Metals: a strategic assessment of the South African industry 

    Garg, A.K.; Van Tonder, R.; Joubert, R.J.O. (Inderscience Enterprises Ltd. http://www.inderscience.com/browse/index.php?journalID=235, 2007)
    In order to analyse the strategic issues with regard to the South African Platinum Group of Metals (PGM) industry, a risk analysis and an assessment of the competitiveness of the industry were conducted. The analysis of ...

  • Flooding and its influence on diazotroph populations and soil nitrogen levels in the Okavango Delta 

    Omari, K.; Mubyana, T.; Matsheka, M.I.; Bonyongo, M.C.; Veenendaal, E. (South African Journal of Botany http://www.elsevier.com/wps/find/journaldescription.cws_home/707238/description#description, 2004)
    Effects of flooding on soil nitrogen (N), and asymbiotic nitrogen fixing bacterial (diazotroph) populations of the Okavango Delta were investigated. Diazotrophs from the rhizosphere of dominant annual and perennial grasses ...

  • Influence of seasonal flooding on soil total nitrogen, organic phosphorus and microbial populations in the Okavango Delta, Botswana 

    Mubyana, T.; Krah, M.; Totolo, O.; Bonyongo, M. (Journal of Arid Environments. http://www.elsevier.com/wps/find/journaldescription.cws_home/622855/description#description, 2003)
    The effect of flooding on soil total nitrogen, phosphorus and microbial population in different vegetation zones (floodplain, island and woodland) and profile depth (0?1, 0?5, 2?0, 3?0, 4?0 and 5?0m) of the Okavango ...

  • The Effects of Soil Cover on Soil Respiration and Microbial Population in the Mopane (Colophospermum mopane) Woodland of North Western Botswana 

    Siele, M.P.; Mubyana-John, T.; Bonyongo, M.C. (Global Science Books http://www.globalsciencebooks.com/index.php?page=shop.product_details&category_id=1&flypage=shop.flypage&product_id=5&option=com_virtuemart&Itemid=56&vmcchk=1&Itemid=56, 2008)
    Soil cover influences soil biological and chemical processes in various ways. The effects of soil cover (bare soil without litter, litter cover, Mopane tree canopy and grass cover) on soil respiration and microbial ...

  • Chemical constituents of Treculia acuminata and Treculia africana (Moraceae) 

    Metuno, R.; Ngandeu, F.; Tchinda, A.T.; Ngameni, B.; Kapche, G.D.W.F.; Djemgou, P.C.; Ngadjui, B.T.; Bezabih, M.; Abegaz, B.M. (Elsevier Ltd. www.elsevier.com/locate/biochemsyseco, 2007)
    Three species of the genus Treculia namely, Treculia acuminata Baill., Treculia africana Decne ex. Treà ´cul and Treculia obovoidea N.E.Br. grow in the humid rain forest of southwest Cameroon. They are also widely ...

  • Electrospray Liquid Chromatography–Mass Spectrometry of the Leaf Extract of Rhamnus prinoides 

    Nindi, M.M.; Kgarebe, B.V.; Wolfender, J.L.; Abegaz, B.M. (John Wiley & Sons, Ltd., 1999)
    Three naphthalenic derivatives, four flavonoids and two of the four anthraquinones previously isolated from the leaves of Rhamnus prinoides were successfully ionised under electrospray ionisation conditions. These compounds ...

  • Novel natural products from marketed plants of eastern and southern Africa 

    Abegaz, B.M.; Ngadjui, B.T.; Bezabih, M.; Mdee, L.K. (International Union of Pure and Applied Chemistry. http://www.iupac.org/publications/pac/, 1999)
    Marketed plants are an important but a vulnerable group of plants whose investigations as well as conservation should be considered with priority. The chemistry, and in some cases biological activities of novel iso¯avonoids, ...

  • Antimicrobial activity of the methanolic extracts and compounds from Treculia obovoidea (Moraceae) 

    Kuete, V.; Metuno, R.; Ngameni, B.; Tsafack, A.M.; Ngandeu, F.; Fotso, G.W.; Bezabih, M.; Etoa, F.; Ngadjui, B.T.; Abegaz, B.M.; Penlap, B.V. (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 activity of the extract from the twigs of Dorstenia Elliptica (Moraceae) 

    Kuete, V.; Ngameni, B.; Tsafack, A.M.; Ambassa, P.; Simo, I.K.; Bezabih, M.; Etoa, F.; Ngadjui, BT; Abegaz, B.M.; Beng, V.P. (Pharmacologyonline. http://www.pharmacologyonline.org/, 2007)
    The crude extract from the twigs of Dorstenia elliptica (DET) as well one of the five compounds isolated from this extract namely O-[3-(2, 2-dimethyl-3-oxo-2H-furan-5-yl)-3- hydroxybutyl]bergaptol (5) were tested for ...

  • Prenylated flavonoids, monoterpenoid furanocoumarins and other constituents from the twigs of Dorstenia elliptica (Moraceae) 

    Abegaz, B.M.; Ngadjui, B.T.; Folefoc, G.N.; Fotso, S.; Ambassa, P.; Bezabih, M.; Dongo, E.; Rise, F.; Petersen, D. (Elsevier Ltd. www.elsevier.com/locate/phytochem, 2003)
    A monoprenylated flavan and two monoterpenoid substituted furanocoumarins were isolated from the twigs of Dorstenia elliptica along with 3-(3,3-dimethylallyl)-4,20,40-trihydroxylchalcone, psoralen, bergapten, O-[3-(2,2- ...

  • 3b-Taraxerol from Bridelia micrantha 

    Kouam, S.F.; Flo¨rke, U.; Krohn, K.; Akhtar, M.N.; Ngadjui, B.T.; Abegaz, B.M. (2009-02-13)
    Isolation of the title compound, C30H50O, from Bridelia micrantha yielded suitable crystals for an X-ray structure determination, showing it to be in the -form. The crystal packing is determined by infinite zigzag O—H ...

  • Antitrichomonal and antioxidant activities of Dorstenia barteri and Dorstenia convexa 

    Omisore, N.O.A.; Adewunmi, C.O.; Iwalewa, E.O.; Ngadjui, B.T.; Adenowo, T.K.; Abegaz, B.M.; Ojewole, J.A.; Watchueng, J. (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 ...

  • Natural resources accounting: A tool for water resources management in Botswana 

    Hambira, W.L. (Elsevier, http://www.elsevier.com/wps/find/journaldescription.cws_home/413/description#description, 2007)
    Natural Resource Accounting (NRA) has become an important environmental/natural resources management tool in recent years. It provides information on stocks of a resource available at a particular point in time and what ...

  • Examination of Blepharis aspera as a possible Cu–Ni indicator plant 

    Nkoanea, B.B.M.; Wibetoe, G.; Lund, W.; Abegaz, B. (South African Journal of Science, 2007)
    BLEPHARIS ASPERA WAS COLLECTED FROM A copper–nickel mineralized area in Botswana and examined as a possible Cu–Ni indicator plant for biogeochemical prospecting. Different plant parts and the host soils were analysed using ...

  • Contact charging of solution-cast polymers by metals 

    Akande, A.R. (Elsevier Science Ltd. www.elsevier.com/locate/elstat, 2005)
    The charge transfer between metals and some solution-cast polymers has been investigated by employing intermittent soft contact under a controlled condition. The result of our measurements reveals that the measured charge ...