Browsing Research articles (Dept of Chemistry) by Title
Now showing items 41-60 of 85
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A fluorescence spectroscopic study of a coagulating protein extracted from Moringa oleifera seeds
(Elsevier B.V. www.elsevier.com/locate/colsurfb, 2007)The fluorescence studies of coagulating protein extracted from Moringa oleifera seeds have been studied using steady-state intrinsic fluorescence. The fluorescence spectra are dominated by tryptophan emission and the ... -
The Free-Radical Copolymerization of Difurylmethane with Maleic anhydride
(South African Journal of Chemistry. <http://ejour.sabinet.co.za/images/ejour/chem/chem_v55_a1.pdf>., 2002)The copolymerization of difurylmethane with maleic anhydride in the presence of azobisisobutyronitrile as an initiator has been investigated at 65 °C, 72 °C and 85 °C in different solvents. Reaction feeds containing 85 ... -
From nature, through chemical synthesis, toward use in agriculture: Oryzoxymycin case study
(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 ... -
Gaboroquinones A and B and 4'-O-demethylknipholone-4'-O-β-D-glucopyranoside, phenylanthraquinones from the roots of Bulbine frutescens
(American Chemical Society. http://pubs.acs.org/jnp/, 2002)The novel phenylanthraquinones 4'-O-demethylknipholone-4'-O-β-D-glucopyranoside (2) and gaboroquinones A (3) and B (4) were isolated from the African medicinal plant Bulbine frutescens. Biaryl 2 represents the first ... -
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 ... -
General Properties and the Fatty Acid Composition of the Oil from the Mophane Caterpillar, Imbrasia belina
(AOCS Press. http://www.springerlink.com/content/0003-021X, 1998)A preliminary investigation of the bulk properties of the oil from the edible mophane caterpillar (phane), Imbrasia belina, showed a significant difference in the iodine values of the oils from mature and young phane. ... -
Homoisoflavonoids and xanthones from the tubers of wild and in vitro regenerated Ledebouria graminifolia and cytotoxic activities of some of the homoisoflavonoids
(Elsevier Ltd. www.elsevier.com/locate/phytochem, 2002)Eleven homoisoflavonoids and two xanthones were isolated and characterized from the bulbs of Ledebouria graminifolia. Five of the homoisoflavonoids are new compounds and were identified as: 5-hydroxy-7-methoxy-3-(40-hyd ... -
Identification of Cu and Ni indicator plants from mineralised locations in Botswana
(Elsevier www.elsevier.com/locate/jgeoexp, 2005)Plant species that accumulate high levels of metals in proportion to the metal content in the soil are of considerable interest in biogeochemical and biogeobotanical prospecting. This study was aimed at investigating ... -
Influence of weak and strong donor groups on the fluorescence parameters and the intersystem crossing rate constant
(Elsevier Science Ltd. www.elsevier.com/locate/saa, 2003)Please refer to the attached article for an ABSTRACT. The abstract was not uploaded here due to formula appearance problem in UBRISA. -
Intermediate and ion-pair formation in the outer-sphere reactions between azido-pentacyanocobaltate(III) and iron(II) polypyridyl complexes in aqueous medium
(Springer Science+Business Media B.V., http://www.springer.com/chemistry/journal/11243, 2009)The kinetics of the reactions between azidopentacyanocobaltate(III), Co(CN)5N3 3-, and iron(II) polypyridyl complexes, Fe(LL)3 2? (LL = bipy, phen), have been studied in both neutral and acidic aqueous solutions at I ... -
Investigation of sustainability of rain-fed agriculture through soil moisture modeling in the Pandamatenga Plains of Botswana
(Elsevier Ltd. http://www.elsevier.com/wps/find/journaldescription.cws_home/413/description#description, 2006)The agricultural economic sector of Botswana is limited mainly to range resources-based livestock and pockets of arable farming based on rainfall and limited irrigated agriculture at several places. In this study agricultural ... -
Isoflavonoids from Seeds of Millettia griffoniana (Bail), 15
(Verlag der Zeitschrift fu¨r Naturforschung, Tu¨bingen · http://znaturforsch.com, 2005)Three new isoflavonoids, griffonianone F, G and H were isolated from the seeds of Millettia griffoniana, along with the known prebarbigerone, pseudobaptigenin, pseudobaptigenin methyl ether, tephrosin, dipterixine, ... -
Kinetic studies on the reactions of some tetrakis(arylisocyanide)cobalt(II) complexes with pyridine in 2,2,2-trifluoroethanol
(Springer, http://www.springer.com/chemistry/journal/11243, 2006)The interaction of pyridine with four tetraki(arylisocyanide)cobalt(II) complexes, [Co(CNR)4(ClO4)2] R = 2,6- Me2C6H3 (A), 2,4,6-Me3C6H2 (B), 2,6-Et2C6H3 (C) and 2,6-iPr2C6H3 (D), have been studied in 2,2,2-trifluoroeth ... -
Lanneanol: A new cytotoxic dihydroalkylcyclohexenol and phenolic compounds from Lannea nigritana (Sc. Ell.) Keay
(Elsevier Ltd. www.elsevier.com/locate/biochemsyseco, 2007)The genus Lannea belongs to the family Anacardiaceae and consists of 40 species. Lannea nigritana (Sc. Elliot) Keay is a small tree of 3e6 m of height found in the tropical rain forest (Berhaut, 1971; Letouzey, 1972). It ... -
Neutral polyfluoroalkyl substances in the global Atmosphere
(The Royal Society of Chemistry, http://pubs.rsc.org/en/journals/journalissues/em#!recentarticles&all, 2014)Concentrations of neutral per- and polyfluoroalkyl substances (nPFAS) in the atmosphere are of interest because nPFAS are highly mobile percursors for perfluoroalkyl acids. Two calibration studies in Ontario, Canada and ... -
Novel natural products from marketed plants of eastern and southern Africa
(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, ... -
The phase separation behaviour and the viscoelastic properties of particles with non-adsorbing polymers: Part I - Experimental study
(Elseview Science B.V. www.elsevier.nl/locate/colsurfa, 2000)A series of well characterised cis-polyisoprene polymers have been added to dispersions of PHS coated PMMA particles in dodecane. At a molecular weight of 8000 g mol−1 and above, these systems showed phase separation at ... -
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). ... -
Phenylpropanoid glycosides of Gnidia polycephala
(Elsevier Ltd. www.elsevier.com/locate/phytochem, 2003)Two phenylpropanoid glucosides, 2-O-b-d-glucosyloxy-4-methoxybenzenepropanoic acid and its methyl ester, together with syringin and adicardin were isolated from the stem of Gnidia polycephala and characterized by physical ... -
Photochromism, anomalous multi-banded fluorescence and laser properties of some amino- and tosyl-amino derivative of oxadiazole
(Elsevier Ltd. www.elsevier.com/locate/saa, 2006)The multi-banded fluorescence and laser properties of 11 new amino- and tosylamino derivatives of 2,5-di(phenyl)-1,3,4-oxadiazole and oxadiazole in various solvents at 293 K are reported. All the compounds investigated ...