A5005899330- Aquatic Ecosystems and Biodiversity
- Toxic Organic Pollutants Impact
- Pesticide and Herbicide Environmental Studies
- Water Quality and Pollution Assessment
- Rangeland Management and Livestock Ecology
- Pharmaceutical and Antibiotic Environmental Impacts
- Environmental Toxicology and Ecotoxicology
- Animal Diversity and Health Studies
- Pesticide Residue Analysis and Safety
- Child Nutrition and Water Access
- Climate change impacts on agriculture
- Heavy metals in environment
- Ruminant Nutrition and Digestive Physiology
- Metal complexes synthesis and properties
- Energy and Environment Impacts
- Organometallic Compounds Synthesis and Characterization
- Vibrio bacteria research studies
- Pesticide Exposure and Toxicity
- Fish Biology and Ecology Studies
- Crystallization and Solubility Studies
- X-ray Diffraction in Crystallography
- Geochemistry and Geologic Mapping
- Agricultural risk and resilience
- Organic and Molecular Conductors Research
- Insect and Arachnid Ecology and Behavior
African Centre for Technology Studies
2023
University of Nairobi
2012-2022
Kenya Medical Research Institute
2015
National Academy of Sciences
2009
African Academy of Sciences
2001-2003
Maseno University
2000
Termites may emit large quantities of methane, carbon dioxide, and molecular hydrogen into the atmosphere. Global annual emissions calculated from laboratory measurements could reach 1.5 x 10(14) grams methane 5 10(16) dioxide. As much as 2 also be produced. Field two termite nests in Guatemala corroborated results. The largest should occur tropical areas disturbed by human activities.
New palladium (Pd)II and platinum (Pt)II complexes (C1–C5) from the Schiff base ligands, R-(phenyl)methanamine (L1), R-(pyridin-2-yl)methanamine (L2), R-(furan-2-yl)methanamine (L3) (R-(E)-N-((1H-pyrrol-2-yl) methylene)) are herein reported. The were characterized by FTIR, 1H 13C NMR, UV–vis, microanalyses. Single-crystal X-ray crystallographic analysis was performed for two ligands (L1–L2) a Pt complex. Both L1 L2 belong to P21/n monoclinic P-1 triclinic space systems, respectively. complex...
Pesticides have been used in the continent for about eight decades. Major use has agriculture, livestock development, and disease vectors control. Recent international conventions made with little scientific data information on tropical situation. Rapid development of resistance to pesticides demands better understanding pest management. Tropical research organochlorine show rapid degradation pattern, low residue levels, widespread distribution. Given above, there is a need factor into...
The recent executive orders by President Donald Trump to withdraw the United States (U.S.) from World Health Organization (WHO) and Paris Climate Agreement, compounded a 90-day freeze on U.S. Foreign Assistance, present significant challenges global health efforts. These actions threaten exacerbate existing crises, undermine decades of security gains, leave Africa world more vulnerable infectious diseases public threats. decisions will likely hinder future initiatives disrupt critical...
In this work, the adsorption-desorption dynamics of diuron in three typical Kenyan agricultural soils, Nzoia (NZ), Thika (TH) and Machakos (MK) was investigated. The equilibrium adsorption data, tested against classical nonlinear isotherms, best described by Freundlich model. constant, (KF), increased order MK > TH NZ soil. Additionally, negative Gibb's free energy values indicate processes were thermodynamically spontaneous physical. Multiple linear regression analysis indicated that...
To investigate land use cover changes (LULCC) in the Kieni sub-county Central Kenya from 1987 to 2017, remote sensing and Geographical Information System (GIS) was used. This done by downloading processing landsat images of 1987, 1995, 2000, 2010 2017. Methods employed were, data identification acquisition, image processing, validation presentation. There were six classifications analysed which were; bare areas, bushlands, farmlands, forest, grasslands waterbodies. The results showed an...
Abstract Roasted meat is known to be a major source of human exposure PAHs. The contribution direct-heat charcoal-roasted, electric- oven grilled, and shallow-pan fried in Kisumu City was not although the three modes cooking are very prevalent. This study analyzed concentrations PAHs raw beef, goat meat, pork, investigated effect charcoal roasting, electric-oven grilling, frying on these concentrations, compared their concentration levels with international standards for foods order assess...
The objective of the study was to detect and identify land cover changes in Laikipia County Kenya that have occurred during last three decades. use types area are six, which main other minor. three, forest, shrub or bush grassland, changed period, grasslands reduced by 5864 ha (40%), forest 3071 (24%) increased 8912 (43%). minor were bare had 238 (45%), river bed vegetation 209 (72%) agriculture 52 (600%) over period Differences spatiotemporal variations could be largely attributed effects...
Results of field and laboratory studies on adsorption/desorption, leaching, dissipation, bound residue formation metabolism DDT, DDE, lindane, parathion, malathion, dimethoate carbofuran in tropical soils various regions Kenya are summarized this paper. Based reported half‐lives dissipation temperate soils, DDE lindane were found to dissipate much more rapidly soil conditions with 64.5–245.6, 145 5–8 days, respectively. Carbofuran (t 1/2 = 66–115.5 days), malathion 36.7–770 parathion 48days)...