Browsing School of Biological and Physical Science by Title
Now showing items 538-557 of 925
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Lake Victoria: The water hyacinth (Eichhornia crassipes [MART.] SOLMS), its socio-economic effects, control measures and resurgence in the Winam gulf
(Urban & Fischer, 2004-05-01)The aquatic weed Eichhornia crassipes [Mart.]Solms was introduced in Lake Victoria from Rwanda via the Kagera River by the activities of man. After originally infesting Lake Victoria (Uganda), it eventually spread into the ... -
Life at the top: rank and stress in wild male baboons
(American Association for the Advancement of Science, 2011-07-15)In social hierarchies, dominant individuals experience reproductive and health benefits, but the costs of social dominance remain a topic of debate. Prevailing hypotheses predict that higher-ranking males experience higher ... -
Life history context of reproductive aging in a wild primate model
(Blackwell Publishing Inc, 2010-08-01)The pace of reproductive aging has been of considerable interest, especially in regard to the long postreproductive period in modern women. Here we use data for both sexes from a 37‐year longitudinal study of a wild baboon ... -
Linear, primary monohaloalkane chemistry in NaX and NaY faujasite zeolites with and without Na0-treatment: Zeolites as nucleophilic reagents II
(Elsevier, 2006-06-20)This work undertakes, we believe for the first time, a study of the chemistry of alkyl halides in Na0 treated zeolites. It concludes that untreated zeolites do nucleophilic chemistry to the degree that the host is electron ... -
Livelihood assessment of avocado growing in western Kenya and its socioeconomic implications using agricultural extension services
(2018-09-09)Avocado (Persia americana) is an important world crop. In Kenya, it has become a very important crop but its production is limited by several factors. Studies were conducted in the Lake Victoria Basin counties of Bunyala ... -
Lonchocarpus eriocalyx (Harms) Herb Extract for Use as Painkillers
(Science Publishing Group, 2020-02-02)Today, many herbal preparations are being prescribed as analgesics. In the past decade, there has been a resurgence of interest in traditional systems of medicine which has become a topic of global interest. Indeed, many ... -
Long term effects of nitrogenous fertilizers on tea yields, nutrients uptake and some soil chemical properties
(Soil Science Society of East Africa, 2005)A field experiment was set up to determine long tenn responses of different rates of nitrogen fertilizers namely used in tea, N~KS 25:5:5:5 and NPK 20: 10: 10, on tea 'Ields, nutrient uptake and soil chemical properties. ... -
Long term fertilizer use on high yielding clone S15/10: Tea yields
(International society of tea science, 2008)High production of young tender shoots of Camellia sinensis L. O. Kuntze to make tea beverages leads to soil nutrients depletion through harvested crop and leaching. The production can be sustained by replenishing the lost ... -
Longitudinal Trajectories of Four Domains of Parenting in Relation to Adolescent Age and Puberty in Nine Countries
(Child development, 2021)Children, mothers, and fathers in 12 ethnic and regional groups in nine countries (N = 1,338 families) were interviewed annually for 8 years (Mage child = 8–16 years) to model four domains of parenting as a function of ... -
A macrophage migration inhibitory factor promoter polymorphism is associated with high-density parasitemia in children with malaria
(Nature Publishing Group, 2006)Macrophage migration inhibitory factor (MIF) is a pleiotropic cytokine that regulates innate and adaptive immune responses to bacterial and parasitic infections. Functional promoter variants in the MIF gene influence ... -
Malaria diagnosis in rural healthcare facilities and treatment-seeking behavior in malaria endemic settings in western Kenya
(Maseno University, 2023)Accurate diagnosis and timely treatment are central requirements for effective malaria management in communities. However, in resource-constrained settings, healthcare facilities are likely to be few, inaccessible, and ... -
Markov model for bamboo harvest forecasting in South Nyanza region, Kenya
(IDRC, 2013)The Markov model applied to bamboo growth and harvest helps determine expected harvest, given survival probabilities at various stages of bamboo growth. The introduction of bamboo in South Nyanza region in Kenya as an ... -
Maternal Vitamin D Status and Adverse Birth Outcomes in Children from Rural Western Kenya
(MDPI, 2016)Maternal plasma 25-hydroxyvitamin D (25(OH)D) status and its association with pregnancy outcomes in malaria holoendemic regions of sub-Saharan Africa is poorly defined. We examined this association and any potential ... -
Mathematical analysis of tip speed ratio of a wind turbine and its effects on power coefficient
(2014)In this paper we estimate the value of tip speed ratio of a wind turbine and evaluate its effects on power coefficient. The power coefficient, Cp, is achieved at a particular tip speed ratio, β, which is specific to the ... -
MATHEMATICAL INVESTIGATION ON THE EFFECT OF NUMBER OF BRANCHES ON WATER HAMMER
(Pushpa Publishing House, 2013-10-01)This paper looks at water hammer with an emphasis on the number of branches. The mathematics of water hammer are described in a transient condition. This includes the momentum and continuity equations for conduits. A ... -
Mathematical model of pneumonia and HIV/AIDS coinfection in the presence of protection
(2015)In this paper, a deterministic co-infection model incorporating protection from infection for both pneumonia infection and HIV/AIDS is considered. The model is shown to be positively invariant as well as bounded. Specifically ... -
Mathematical model of variable speed pitch regulated turbine in a wind energy conversion system
(2014)Pitch control of wind turbine in a wind energy conversion system involves the change of the rotor blade pitch angle along the rotor axis. Most compa-nies are faced with the challenge of maintaining a steady and optimal ... -
Mathematical modelling of the Olkaria Geothermal Reservoir
(School of Mathematics, University of Nairobi, 1996-05)The basic equations which govern the flow of fluids in a geothermal reservoir (often a two-phase mixture of steam. and water) are outlined. The governing nonlinear system of partial differential equations that arises is ... -
Mathematical modelling of wind turbine in a wind energy conversion system: Power coefficient analysis
(2012-01)The world is increasingly going green in its energy use. Wind power is a green renewable source of energy that can compete effectively with fossil fuel as a generator of power in the electricity market. For this effective ... -
A Measure of Economic Rationality in the Smallholder Tea Sub-Sector in Kenya
(Department of Agricultural Economics; University of Nairobi., 2001)The smallholder tea sub-sector in Kenya is considered the largest and one of the most successful smallholder schemes in the world. However, tea productivity in this sub-sector has been persistently low when compared with ...