Browsing Department of Biochemistry and Biotechnology by Issue Date
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ChemInform Abstract: Birch Reduction of Electron-Deficient Pyrroles.
(Wiley Online Library, 1997-03-11)ChemInform is a weekly Abstracting Service, delivering concise information at a glance that was extracted from about 100 leading journals. To access a ChemInform Abstract of an article which was published elsewhere, please ... -
Reduction of electron-deficient pyrroles using group I and II metals in ammonia
(RSC Publishing, 1998)The preparation and Birch reduction of a series of electron-deficient pyrroles is described. This methodology allows the synthesis of a variety of C-2 substituted 3-pyrrolines ‡ in good to excellent yields. The role of ... -
The Birchreduction of 3-substituted pyrroles
(ELSELVIER, 1998-05-07)The Birchreduction of electron-deficient 3-substituted pyrroles is described. Use of a reductive alkylation procedure involving sodium metal in liquid ammonia gave good yields of 4-alkyl-2-pyrrolines. The identity of these ... -
The stereoselectiveBirchreduction of pyrroles
(ELSELVIER, 1999-01-15)The Birchreduction has been applied to electron-deficient pyrroles substituted with a chiral auxiliary at the C-2 position. Using either 8-phenylmenthol ortrans-2-(α-cumyl)cyclohexanol (TCC) as auxiliaries, high levels of ... -
11α-Hydroxy muzigadiolide, a novel drimane sesquiterpene from the stem bark of warburgia ugandensis
(Bulletin of the Chemical Society of Ethiopia, 1999-12-03)The plant was identified by Prof. MS Rajab by comparison with a preserved standard specimen at the National Museum I-lerbarium in Nairobi, Kenya. . -
Reductivealdolreactions on aromatic heterocycles
(Elsevier, 2000-02-12)The Birch reduction of both pyrroles and furans can be quenched with an aldehyde electrophile, thus constituting a reductivealdolreaction. Although the reaction was not stereoselective, the pyrrolines derived from reduction ... -
Control of Witchweed Striga hermonthica by Intercropping with Desmodium spp., and the Mechanism Defined as Allelopathic
(Spingerlink, 2002)During investigations into the control of insect damage to maize crops in subsistence farming in Kenya, which involved intercropping with repellent plants, the fodder legumes silverleaf (Desmodium uncinatum) and greenleaf ... -
Control of Witchweed Striga hermonthica by Intercropping with Desmodium spp., and the Mechanism Defined as Allelopathic
(Spingerlink, 2002)During investigations into the control of insect damage to maize crops in subsistence farming in Kenya, which involved intercropping with repellent plants, the fodder legumes silverleaf (Desmodium uncinatum) and greenleaf ... -
Isoflavanones from the allelopathicaqueousrootexudate of Desmodiumuncinatum
(Elsevier, 2003)Three isoflavanones, 5,7,2′,4′-tetrahydroxy-6-(3-methylbut-2-enyl)isoflavanone (1), 4″,5″-dihydro-5,2′,4′-trihydroxy-5″-isopropenylfurano-(2″,3″;7,6)-isoflavanone (2) and 4″,5″-dihydro-2′-methoxy-5,4′-dihydroxy-5″-isopro ... -
Starch hydrolysing Bacillus halodurans isolates from a Kenyan soda lake
(2004)Fourteen obligate alkaliphilic and halotolerant bacterial isolates, exhibiting extracellular amylase activity at 55degreesC and pH 10, were isolated from hot springs around Lake Bogoria, Kenya. From 16S rDNA sequence ... -
An alkaline active maltooligosaccharide forming alpha-amylase from Bacillus halodurans
(Suhaila Hashim, 2004)Title An alkaline active maltooligosaccharide forming alpha-amylase from Bacillus halodurans Author/s Suhaila Hashim Department/s Biotechnology (LTH) Full-text Full text is not available in this archive Defence date ... -
Synthesis of a5-alkoxypyrido[4,3-d]pyrimidin-4(3H)-onederivativeviaaregioselectiveMeisenheimerN-oxiderearrangement
(Elsevier, 2004-05-03)The synthetic strategy towards a5-alkoxypyrido[4,3-d]pyrimidin-4(3H)-one is described utilizing a selective N-oxidation and subsequent regioselectiveMeisenheimerN-oxiderearrangement as key steps. -
Alkaline active maltohexaose-forming α-amylase from Bacillus halodurans LBK 34
(Elsevier Inc., 2005)The gene encoding Amy 34, a maltohexaose-forming α-amylase from Bacillus halodurans LBK 34 isolated from Lake Bogoria, Kenya, was cloned and sequenced. The mature peptide consists of 958 amino acids with a theoretical ... -
Poly(beta-hydroxybutyrate) production by a moderate halophile, Halomonas boliviensis LC1 using starch hydrolysate as substrate
(Blackwell, 2005)The objective of the present work was to enable the use of starch hydrolysate, generated by the action of a recombinant maltooligosaccharide forming amylase from Bacillus halodurans LBK 34, as the carbon source for the ... -
Poly(beta-hydroxybutyrate) production by a moderate halophile, Halomonas boliviensis LC1 using starch hydrolysate as substrate
(Blackwell, 2005)Title Poly(beta-hydroxybutyrate) production by a moderate halophile, Halomonas boliviensis LC1 using starch hydrolysate as substrate Author/s Jorge Quillaguaman, Suhaila Hashim, F Bento, Bo Mattiasson, Rajni Hatti-Kaul ... -
Utility of the Ammonia-Free Birch Reduction of Electron-Deficient Pyrroles: Total Synthesis of the 20S Proteasome Inhibitor, clasto-Lactacystin b-Lactone
(Chem. Eur. J., 2005)A new synthesis of the 20S proteasome inhibitor clasto-lactacystin b-lactone is described. Our route to this important natural product involves the partial reduction of an electron deficient pyrrole as a key step. By ... -
Chemiluminescencedetection of aminoacids using an Edman-typereagent, 4-(1′-cyanoisoindolyl)phenylisothiocyanate
(ELSELVIER, 2005-04-11)The 4-(1′-cyanoisoindolyl)phenylisothiocyanate (CIPIC) could be used as a chemiluminescence (CL) Edman-typereagent. Firstly, CL reaction conditions such as pH, buffer types, H2O2 concentration and organic solvents were ... -
Utility of the Ammonia-Free Birch Reduction of Electron-Deficient Pyrroles: Total Synthesis of the 20S Proteasome Inhibitor, clasto-Lactacystin β-Lactone
(Wiley Online Library, 2005-05-02)A new synthesis of the 20S proteasome inhibitor clasto-lactacystin β-lactone is described. Our route to this important natural product involves the partial reduction of an electron deficient pyrrole as a key step. By ... -
Heavy metal tolerance and antibiotic resistance profiles of gram negative bacteria isolated from Lake Victoria, Kenya
(African Journals Online, 2007)Pollution and increased levels of heavy metals in the Lake Victoria Wetlands are suspected to be negatively influencing the biota in one of the world most important freshwater resources. In this study, fecal contamination ... -
C-methylated and C-prenylatedisoflavonoids from rootextract of Desmodiumuncinatum
(Elsevier, 2007)A pterocarpan, 1,9-dihydroxy-3-methoxy-2-methylpterocarpan (named uncinacarpan) and two isoflavanones, 5,7-dihydroxy-2′,3′,4′-trimethoxy-6-(3-methylbut-2-enyl)isoflavanone (named uncinanone D) and 5,4′-dihydroxy-7,2′-dim ...