Browsing School of Biological and Physical Science by Title
Now showing items 755-774 of 925
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Responses of ecosystem carbon dioxide fluxes to soil moisture fluctuations in a moist Kenyan savanna
(Cambridge University Press, 2010-11-01)act: Measurements were conducted within a fence-exclosure between February 2008 and July 2009 to investigate the influence of soil moisture on ecosystem CO2 fluxes in a Themeda irifl/idra-dominated grassland of a humid ... -
Responses of mango (Mangifera indica L.) root stock seedlings to water stress
(Asian Network for Scientific Information, 2007)The present studies were aimed at investigating the effect of different watering regimes on the gas exchange parameters (stomatal conductance, CO<sub>2</sub> assimilation and transpiration rates) and chlorophyll content ... -
Responses of slenderleaf rattlebox (Crotalaria ochroleuca) to water deficit
(2017)Water deficit affects plant growth and development thus affecting crop productivity. It is the major a biotic stress experienced in the vast semi arid and arid regions of Kenya and the world as a whole. Water deficit ... -
Review of current state of knowledge of microcystin and its impacts on fish in Lake Victoria
(Lakes and reserviors,science,policy and management for sustainable use, 2020-07-03)Microcystins are part of algal toxins produced intracellularly within algal cells, being in the family of hepatotoxic cyclic peptides from various species of blue‐green algae. Blue‐green algae are widely abundant in many ... -
Review of current state of knowledge of microcystin and its impacts on fish in Lake Victoria
(Wiley, 2020)Microcystins are part of algal toxins produced intracellularly within algal cells, being in the family of hepatotoxic cyclic peptides from various species of blue-green algae. Blue-green algae are widely abundant in many ... -
A review of tobacco abuse and its epidemiological consequences
(Springer, 2021)Aim The economic burden caused by death and disease in the world is credited mainly to tobacco use—currently linked to approximately 8,000,000 deaths per year with approximately 80% of these faralities reported in low and ... -
Revisiting non-degenerate parametric down-conversion
(Springer-Verlag, 2008)he quantum dynamics of a two-mode non-resonant parametric down-conversion process is studied by recasting the time evolution equations for the basic operators in an equivalent spin equation form with simpler exact solutions ... -
Rheological Properties of Blends of Isotactic Polystyrene–Isotactic Poly(para-methylstyrene) Films Derived from a Comparative Dewetting Study
(American Chemical Society, 2020)We examined changes in rheological properties of nonequilibrated spin-coated thin films of isotactic polystyrene (iPS) and isotactic poly(para-methylstyrene) and blends thereof by dewetting experiments. For 200 nm thick ... -
Risk associations of submicroscopic malaria infection in lakeshore, plateau and highland areas of Kisumu County in western Kenya
(Public Library of Science, 2022-05)Persons with submicroscopic malaria infection are a major reservoir of gametocytes that sustain malaria transmission in sub-Saharan Africa. Despite recent decreases in the national malaria burden in Kenya due to vector ... -
Robust Arduino controlled spin coater using a novel and simple gravity chuck design
(Elsevier, 2023-06)Spin coaters offer an invaluable method of thin film fabrication. Various implementations, both proprietary and open-source exist, offering vacuum and gravity samples chucks. These implementations vary in their reliability, ... -
Role of bismuth and substrate temperature on the optical properties of some flash evaporated se100-x bix glassy system
(University of Nairobi, Kenya, 2015)Chalcogenide glasses are very important in the modern technology especially selenium-based. These glasses are sensitive to electromagnetic radiation useful in the infrared optics. The study investigated the effect of ... -
The role of complement immune response on artemisinin-based combination therapy in a population from malaria endemic region of Western Kenya
(Springer, 2020)Naturally acquired immunity (NAI), which is characterized by protection against overt clinical disease and high parasitaemia, is acquired with age and transmission intensity. The role of NAI on the efcacy of anti-malarial ... -
Role of cosubstrate and bioaccessibility played in the enhanced anaerobic biodegradation of organochlorine pesticides (OCPs) in a paddy soil by nitrate and methyl...
(Springer Berlin Heidelberg, 2014-07-01)Abstract The present study was conducted to investigate the anaerobic biodegradation potential of biostimulation by nitrate (KNO 3) and methyl-β-cyclodextrin (MCD) addition on an aged organochlorine pesticide ... -
The role of Kenya Tea Development Agency Limited in the small-scale tea holder development in Kenya.
(International Society of Tea Science, 2008)The Kenya Tea Development Authority (KTDA) was formed in 1964 to take over the functions of the Special Crops Development Authority (SCDA), which had been set in 1960 to promote tea growing by indigenous Kenyans (Africans). ... -
Role of monocyte-acquired hemozoin in suppression of macrophage migration inhibitory factor in children with severe malarial anemia
(American Society for Microbiology Journals, 2007)Severe malarial anemia (SMA), caused by Plasmodium falciparum infections, is one of the leading causes of childhood mortality in sub-Saharan Africa. Although the molecular determinants of SMA are largely undefined, ... -
Role of oxygen concentrations on structural and optical properties of RF magnetron sputtered ZnO thin films
(Springer US, 2019)We report an investigation on the efect of oxygen fow rate on the structural and optical properties of zinc oxide thin flms prepared by RF magnetron sputtering. The structural measurements were carried using grazing ... -
The role of wetlands in the changing ecophysiology and distribution of plant species: a comprehensive review
(2011)Wetlands are important ecosystems globally. Changes in plant species physiology, species composition, species distribution and phenology have occurred with changes and modifications of wetland ecosystems. This paper ... -
Root-Fusion Characteristic of Eucalyptus Trees Block Gully Development
(Scientific Research Publishing, 2013-08-28)Soil erosion by water resulting in gully formation is a common occurrence in western Kenya. Establishment of local and sustainable countermeasures to prevent gully development/expansion in western Kenya is an urgent issue. ... -
Roots spatial distribution and growth in bambara groundnuts (Vigna subterranea) and NERICA rice (Oryza sativa) intercrop system
(Asian Research Publishing Network (ARPN)., 2010)Intercropping offers advantages if well planned including improved soil fertility and yields. Bambara groundnuts have been shown to yield in low fertility soils and have been described as a complete food. NERICA rice has ... -
Ruwenine and ruzorine: Pyrrolizidine alkaloids of Senecio ruwenzoriensis
(Pergamon, 1992-09-01)A reinvestigation of Kenyan Senecio ruwenzoriensis reported to contain two alkaloids of unknown structures, ruwenine and ruzorine, resulted in the isolation of the pyrrolizidine alkaloid isoline, accompanied by what appeared ...