Browsing RP-Department of Chemistry by Issue Date
Now showing items 1-20 of 500
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Suppression of interfering ions in the analysis of plants to determine fluoride using the fluoride ion selective electrode
(Royal Society of Chemistry, 197)Plant ashes may contain sufficient aluminium and/or iron to interfere seriously in the determination of fluoride ions when using the fluoride ion selective electrode. In the presence of these metals the known additions ... -
Characterization of heart plaque in by‐passed and non‐bypassed heart arteries
(Taylor & Francis, 199)Patients who have undergone bypass surgery often find the bypasses fill up again with plaque ("new plaque") whereas the heart arteries not bypassed contain plaque deposited since childhood ("old plaque"). A preliminary ... -
Fabrication of Rh-doped TiO2 nanofibers for Visible Light Degradation of Rhodamine B
(Materials Research Society: Volume 1352,, 201)The synthesis and application of environmentally benign, efficient and low cost heterogeneous catalysts is increasingly important for affordable and clean chemical technologies. Nanomaterials have been proposed to have new ... -
Anti-protozoal activity of aporphine and protoberberine alkaloids from Annickia kummeriae (Engl. & Diels) Setten & Maas (Annonaceae)"
(BMC Complementary and Alternative Medicine, 201)Background: Malaria, trypanosomiasis and leishmaniasis have an overwhelming impact in the poorest countries in the world due to their prevalence, virulence and drug resistance ability. Currently, there is inadequate armory ... -
Reactions of Lead Tetraacetate. II. Formation of Carbamic Acid Esters from Primary Carboxamides
(CSIRO Publishing, 1968)Treatment of primary carboxamides with lead tetraacetate in benzene-alcohol mixtures or neat alcohol affords a convenient, flexible, and efficient method for the preparation of N-substituted carbamic acid esters. The ... -
Reactions of Lead Tetraacetate. I. Formation of Acylamines from Primary Carboxamides
(CSIRO Publishing, 1968)Pentanamide, when treated with lead tetraacetate in hot benzene, affords a mixture of N-butylacetamide and N,N?-dibutylurea. Examples of similar transformations of a number of primary carboxamides are described. The reaction, ... -
The Structure and Synthesis of Barakol: a Novel Dioxaphenalene Derivative from Cassia siamea
(Royal Society of Chemistry, 1970)Barakol, from the leaves of Cassia siamea, is shown to be a novel dioxaphenalene derivative. A synthesis from 3,5-dihydroxyphenylacetic acid is described. -
Reaction of some arylacetic acids and related compounds with alkaline sodium hypochlorite solution
(Royal Society of Chemistry, 1978) -
Synthesis, Spectral and Structural Studies, and an Evaluation of the Hydrogen Bonding of Some Phenylhydrazone
(Royal Society of Chemistry, 1980)A series of 46 phenylhydrazones, soms novel, containing a variety of structural types has been synthesised. These have been studied by lH n.m.r. and i.r. spectroscopy with respect to potential inter- and intra-mslecular ... -
Crystal and molecular structures of butan-2-one p-nitrophenylhydrazone (1), propanal 2,4-dinitrophenylhydrazone (2), dimethyl 2-oxo-propanedioate phenylhydrazone (3), and dimethyl 2-oxopropanedioate 2,4-dinitrophenylhydrazone (4): hydrogen bonding and bond order in phenylhydrazones
(Royal Society of Chemistry, 1981)Crystals of the title compound (1), C10H13N3O2, are monoclinic, a= 4.119(11), b= 18.992(12), c= 13.992(10)Å, β= 96.0(1)°, space group P21/c, Z= 4. Compound (2), C9H10N4O4, is monoclinic a= 5.333(7), b= 11.488(8), c= ... -
The preparation of synthetic analogues of strigol
(Royal Society of Chemistry, 1981-01-01) -
Distribution of Fungicide-derived Copper in Soils, Litter and Vegetation of Different Aged Stands of Coffee (Coffea arabica L.) in Kenya
(Martinus Nijhoff/Dr. W. Junk Publishers, 1984)Samples of soils, litter and vegetation, collected from 24, 14 and 4 years old stands of coffee (Coffea arabica L.), which had been routinely treated with copper fungicides, were analysed for copper content. Total soil ... -
Phytochemical Screening of Tanzanian Medicinal Plants. I.
(Elsevier, 1984-07)To evaluate traditional medicine, which is an important part of the health-care system in Tanzania, three different regions, Coast, Morogoro and Kilimanjaro were surveyed for the herbs used by traditional healers. For each ... -
Iron content of some samples of the black murrams and red ochres from different parts of Kenya
(Penerbit UTHM, 1985)A number of samples of the black or dark ironstone(commonly referred to as murram) and some red ochres collected from different parts of Kenya were analysed, particularly for their iron content. The results show that some ... -
Identification of tsetse attractants from excretory products of a wild host animal, Syncerus caffer
(International Journal of Tropical Insect Science, 1986-01-01)Urine from the buffalo, Syncerus caffer, a natural host of the tsetse, has been shown previously to be a potent olfactory attractant for tsetse in the field. The attractant compounds have been found to be extractable into ... -
Studies on limonoid insect antifeedants
(International Journal of Tropical Insect Science, 1986-01-07)Limonin, deoxylimonin, citrolin, obacunone, harrisonin and acetoxyharrisonin were assayed as potential antifeedanfe against the African crop pests, Spodoptera exempta, Eldana saccharina and Manica testulalis. Even at the ... -
A new pterocarpan from the roots of Tephrosia hildebrandtii
(Elsevier, 1987)A new 6a-hydroxylated pterocarpan has been isolated from the roots ofTephrosia hildebrandtii and its structure established on the basis of its spectral data. -
Insect antifeedants from Tephrosia elata Deflers
(International Journal of Tropical Insect Science, 1987-01-01)Two antifeedants, isopongaflavone and tephrosin have been isolated from Tephrosia elata. Tephrosin displayed high activity against Spodoptera exempta, while isopongaflavone was shown to be very active against Maruca ... -
The Role of 4-Cresol and 3-n-Propylphenol in the Attraction of Tsetse Flies to Buffalo Urine
(International Journal of Tropical Insect Science, 1988-01-01)Seven phenolic compounds (phenol, 3- and 4-cresols, 3- and 4-ethylphenols, and 3- and 4-n-propylphenols) previously shown to be components of a fraction of an extract of buffalo urine which was active as a tsetse attractant, ...
