Browsing School of Biological and Physical Science by Title
Now showing items 900-919 of 925
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Validated RP-UHPLC PDA and GC–MS methods for the analysis of psychoactive alkaloids in Sceletium tortuosum
(Elservier, 2012)Anecdotal evidence indicates that Sceletium tortuosum has been used as a psychoactive preparation for several centuries. The psychological activity is attributed to the production of mesembrine-type alkaloids (mesembrenol, ... -
Validated RP-UHPLC PDA and GC–MS methods for the analysis of psychoactive alkaloids in Sceletium tortuosum
(Elsevier, 2012)Anecdotal evidence indicates that Sceletium tortuosum has been used as a psychoactive preparation for several centuries. The psychological activity is attributed to the production of mesembrine-type alkaloids (mesembrenol, ... -
valuation for resistance to the spotted stem borer, Chilo Partellus, in a maize (zea mays L.) population. Maize Production Technology for the Future: Challenges and Opportunities. Proceedings of the Eastern and Southern Africa Regional Maize Conference, 6; Addis Ababa (Ethiopia); 21-25 Sep 1998.
(Centro Internacional de Mejoramiento de Maiz y Trigo (CIMMYT), Mexico DF (Mexico)., 1999)AGenetic variability and predicted responses to S2 and testcross selection methods were studied in an open-pollinated variety resistant to the spotted stem borer,(Chilo partellus Swinhoe). Evaluation after one cycle of ... -
Variability of overhead volatile organic compounds in clonal tea (Camellia sinensis) and their influence on red crevice mite (brevipalpus phoenicis geijskes) infestati...
(2016)Tea production in Kenya is under threat due to red crevice mites (Brevipalpus phoenicis) infestations during droughts. Cultural pests control practices, eg use of resistant/tolerant cultivars are used in their control ... -
Variability of VTEC Gradient and TEC Rate Index Over Kisumu, Kenya During Selected Quiet and Storm Days of 2013 and 2014
(Science Publishing Group, 2019)Vertical Total electron content (VTEC) gradient or rate of change of TEC (ROT) and total electron content (TEC) rate index or rate of change of TEC index (ROTI) can directly be estimated from receiver independent exchange ... -
Variation for adaptability to dryland conditions in sorghum
(African Crop Science Society, 1996)African Crop Science Journal Vol.5. No.2, pp.127-138 1997 Variation for adaptability to dryland conditions in sorghum G.O. OMANYA, P.O. AYIECHO and J.O. NYABUNDI Code Number: CS96049 Sizes of Files: Text: 33.9K Graphics: ... -
Variation in catechin composition of popularly cultivated tea clones in East Africa (Kenya)
(2013)Variation in catechin composition of popularly cultivated tea clones in East Africa (Kenya) -
Variation in indoor levels of polycyclic aromatic hydrocarbons from burning various biomass types in the traditional grass-roofed households in Western Kenya
(Elsevier, 2011-07-31)Biomass burning as fuel in the traditional grass-roofed rural households of Western Province of Kenya in open fire places, in poorly ventilated conditions, lead to accumulation of soot under the roofs. This study ... -
Variations in Camellia sinensis (L) Leaf Nutrients and Polyphenols Levels with Genotypes, Nitrogenous Fertilizer Rates, Season and Plucking Intervals in Eastern Africa Tea Growing Regions
(Mase University, 2013)In Eastern Africa, teas are grown in high rainfall areas causing fast nutrients depletion. Foliar nutrients diagnostic limits developed for seedling tea have been in use since 1970s and they have been adopted for clonal ... -
Variations in soil pH, N, P and K due to influence of rates, split applications of nitrogen fertilizer and ratoon crop of sugarcane varieties
(ResearchGate, 2023)Fertilizer Best Management Practices (BMPs) include soil testing that is performed to determine the availability of essential elements for profitable and productive yields of crops. The objective of this research was to ... -
Variations in the Precursors of Plain Black Tea Quality Parameters Due to Location of Production and Nitrogen Fertilizer Rates in Eastern African Clonal Tea Leaves
(Cambridge University Press, 2016-04)Summary Theaflavins contribute to astringency and brightness while thearubigins contribute to colour and mouth feel of black tea. Green leaf flavan-3-ols influence levels and distribution of theaflavins and thearubigins ... -
Variations in the Volatile Flavour Compounds Composition of Selected Nerica Rice Varieties Grown in Different Agro-Ecological Zones in Lake Victoria Basin, Kenya
(Maseno University, 2017)Rice (Oryza sativa L.) is a staple food consumed worldwide. Some rice cultivars are preferred over others due to their distinctive aroma which contributes to consumer acceptability and increased economic importance. New ... -
Variations of fatty acids levels in young shoots of clonal tea with location of production and nitrogenous fertilizer rates in the Kenya highlands
(Journal of Agricultural Science and Technology, 2012)Tea leaves contain unsaturated fatty acids, key precursors of volatile compounds contributing to tea aroma quality. Tea is cultivated in areas with diverse environmental conditions. Nitrogenous fertilizers influence tea ... -
Variations of Fatty Acids Levels in Young Shoots of Clonal Tea With Location of Production and Nitrogenous Fertilizer Rates in the Kenya Highlands
(Journal of Agricultural Science and Technology, 2012)Tea leaves contain unsaturated fatty acids, key precursors of volatile compounds contributing to tea aroma quality. Tea is cultivated in areas with diverse environmental conditions. Nitrogenous fertilizers influence tea ... -
Vitamin D status in healthy black African adults at a tertiary hospital in Nairobi, Kenya: a cross sectional study
(BioMed Central, 2018)Vitamin D has been known since the twentieth Century for its benefits in bone health. Recent observational studies have demonstrated its benefits in infectious diseases such as tuberculosis and non-communicable diseases ... -
Voulkensin C–E, new 11-oxocassane-type diterpenoids and a steroid glycoside from Caesalpinia volkensii stem bark and their antiplasmodial activities
(Pergamon, 2013-05-15)A bioassay guided isolation of potential antimalarial molecules from the stem bark of Caesalpinia volkensii Harms (Fabaceae) achieved three new 11-oxocassane-type diterpenoids named voulkensin C (1), D (2) and E (3) together ... -
Water Hyacinth (Eichhornia crassipes) Management and Utilization in the Lake Victoria Region
(Department of Horticulture Jomo Kenyatta University of Agriculture and Technology, JKUAT, 2002)Water hyacinth has long been perceived as a problem for shipping and fishing industries and only more recently as a threat to bio-diversity. It can undergo rapid proliferation, forming dense mats of plants that cover water ... -
Water Quality of Selected Fishing Beaches of Lake Victoria Kenyan Gulf
(Scientific Research Publishing, 2020-01-06)Lake Victoria the second largest fresh water body in the world located in East Africa is a shared resource between Kenya, Tanzania and Uganda and enjoys a wide range of streams and rivers from as far as Burundi and Rwanda. ... -
Weak Solution of the Singular Cauchy Problem of Euler-Poisson-Darboux Equation for n= 4
(2013)We consider the singular Cauchy problem of Euler-Poisson-Darboux equation (EPD) of the form utt+ k t ut=∇ 2u u (x, 0)= f (x), ut (x, 0)= 0 where∇ 2 is the Laplacian operator in R n, n will refer to dimension and k a real ... -
Yield and Yield Stability of Four Population Types of Grain Sorghum in a Semi‐Arid Area of Kenya
(Crop Breeding, Genetics & Cytology, 2000-03-01)Sorghum [Sorghum bicolor (L.) Moench] is widely grown in semi‐arid tropics where local farmers depend on the adaptability of their rainfed crops to unpredictable drought and other stress factors. To investigate the effects ...