Browsing Faculty of Science & Technology (FST) by Title
Now showing items 3238-3257 of 4264
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(R)-Prechrysophanol from Aloe graminicola
(Department of Chemistry, University of NairobiUniversitaet Hannover, Institut fuer Organische Chemie, Germany, 1993)From the subterranean stem of Aloe graminicola, a new pre-anthraquinone named prechrysophanol was isolated. Chrysophanol, helminthosporin, (R)-aloesaponol I, (R)-aloesaponol II, aloesaponarin I, aloesaponarin II and laccaic ... -
Radiation Acts on the Microenvironment to Affect Breast Carcinogenesis by Distinct Mechanisms that Decrease Cancer Latency and Affect Tumor Type
(2011)Tissue microenvironment is an important determinant of carcinogenesis. We demonstrate that ionizing radiation, a known carcinogen, affects cancer frequency and characteristics by acting on the microenvironment. Using a ... -
Radiation Measurements Mount Kenya, At Lewis Kenya
(University of Nairobi, 1980)ABSTRACT. Short- and long-wave radiation on variously oriented vertical surfaces, direct solar radiation, global radiation, and long-wave radiation on a horizontal surface were measured on Lewis Glacier, Mount Kenya, ... -
A Radio-telemetry Technique For Monitoring Temperatures From Unrestrained Ungulates
(University of Nairobi, 1970-10)Miniature radio transmitters were used to monitor deep muscle, subcutaneous, skin surface, and hair stlrface temperatures in three species of unrestrained African ungulates. Deep muscle and suboutaneous transmitters were ... -
Radiological Analysis of Suitability of Kitui South Limestone for use as Building Material
(2013)Indoor exposure arises from the soils from which the building stands and the building materials used for construction. This is because all building materials contain certain levels of natural radionuclides 238U, 232Th, ... -
Radiological diagnosis of bilharzial granuloma of the spinal cord
(School of Biological and Physical sciences, 1970) -
Radiological Mapping of the Alkaline Intrusive Complex of Jombo, South Coastal Kenya by In-Situ Gamma-Ray Spectrometry
(University of Nairobi, 2016)Carbonatites and alkaline intrusive complexes are rich in a variety of mineral deposits such as rare earth elements (REEs), including Nb, Zr and Mn. These are often associated with U and Th bearing minerals, including ... -
Radiometric Survey of the Tyaa River Sand Mine in Kitui, Kenya
(University of Nairobi, 2020)Gamma spectroscopic analyses of sand and rock samples from Tyaa River report an average activity concentration of 33 ± 1, 55 ± 2.8 and 812 ± 40.46 Bqkg-1 for 226Ra, 232Th and 40K, respectively in the sand. A similar analysis ... -
Rainfall characteristics as an indicator of drought in semi-arid Kitui district of Kenya (revised)
(Department of Meteorology, 2004) -
The rainfall distribution at a tree/crop interface.
(University of NairobiCollege of biological and physical science, 1987) -
Rainfall distribution over Nairobi area
(University of Nairobi, Department of MeteorologyMeteorology, 2007)The distribution of rainfall in time and space over Nairobi area is analysed for the 31-year base period between 1960 and 1990. The high-resolution limited-area numerical model, Geesthacht Simulation Model of the Atmosphere ... -
Rainfall influences on ungulate population abundance in the Mara-Serengeti ecosystem.
(University of NairobiSchool of Computing and Informatics, 2008)1. Rainfall is the prime climatic factor underpinning the dynamics of African savanna ungulates, but no study has analysed its influence on the abundance of these ungulates at monthly to multiannual time scales. 2. We ... -
Rainfall pattern and nutrient content influences on African elephants’ debarking behaviour in Samburu and Buffalo Springs National Reserves, Kenya
(2011 Blackwell Publishing Ltd, Afr. J. EcolSchool of biological sciences, 2011)The magnitude of debarking by elephants was investigated in Samburu and Buffalo Springs National Reserves. About 1617 plants were monitored for debarking intensities for 6 months spanning through dry and wet seasons. Debarking ... -
Rainfall runoff modeling in Yala River basin of Western Kenya
(Department of Meteorology, 2011)When rainfall is received on a watershed, depending on the ini al soil moisture content some of the water seeps underground while the excess forms surface water response. The nature of the runoff and its effects in the ... -
Rainfall Variability in Africa
(Department of Meteorology, University of Nairobi, 1979)Time series' of annual rainfall for 69 stations in Africa we~e analyzed for trends an? p~riodicities. Trend analysis showed that most of the annual series indicate some forr~s ~f ?sclllatlons .. rather than any particular ... -
Rainfall Variability in East Africa
(University of Nairobicollege of biological and physical science, 1979) -
Raman Crystallinity and Hall Effect Studies of Microcrystalline Silicon Seed Layers
(University of Nairobi, 2017)Aluminium induced crystallization (AIC) was used to crystallize sputtered amorphous silicon thin films on aluminium-coated glass substrates at annealing temperatures ranging from 250-520°C in vacuum. Crystalline volume ... -
The Raman Spectra of mixed crystals of metal carbonyls in the 2000 cm-1 region", Jour nal of Organomentallic Chemistry, 105 209
(University of NairobiCollege of biological and physical science, 1976) -
Raman Spectra of mixed crystals of transition metal hexacarbonyls
(University of NairobiCollege of biological and physical science, 1978)
