Faculty of Science & Technology (FST): Recent submissions
Now showing items 1061-1080 of 4283
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Gonadal and reproductive patterns in Tilapia leucosticta (Teleostei: Cichlidae) in an equatorial lake, Lake Naivasha (Kenya)
(University of Nairobi, 2009-08)The cichlid fish T. leucosticta (Trewavas) was studied by fortnightly seining an area of an equatorial lake (Lake Naivasha) in Kenya to study their reproductive and gonadal patterns. The study lasted 16 months during which ... -
Structure and fine structure of the hypophyseal pars distalis in endigenous African species of the genus Tilapia
(University of Nairobi, 1974)The structure and fine structure of the pars distalis hypophyseos was examined in five species of Tilapia fishes (T. alcalica, T. grahami, T. leucosticta, T. zillii, T. nigra) which were collected from lakes of a wide range ... -
Compensatory Hypertrophy Of The Remaining Ovary And The Effects Of Methallibure In The Unilaterally Ovariectomized Tilapia Aurea
(University of Nairobi, 1976)In Tilapia aurea unilateral ovariectomy resulted in a compensatory hypertrophy of the remaining ovary. The compensatory hypertrophy is manifested by: (a) an increase in the number of dividing oogonia; and (b) hypertrophy ... -
Enhancement of fruit quality in Capsicum annum through pollination by Hypotrigona gribodoi in Kakamega, Western Kenya
(University of Nairobi,, 2014)A study was carried out in Kakamega forest, in the western region of Kenya, to evaluate the effectiveness of the stingless bee Hypotrigona gribodoi (Magretti, 1884) on the pollination of green pepper. Three treatments were ... -
Effect of thyroxine on the ultrastructure of the hypophyseal proximal pars distalis in Tilapia zillii
(University of Nairobi, 1975)The effects of exogenous L-thyroxine on the fine structure of the proximal pars distalis cells were examined in Tilapia zillii. In thyroxine-treated animals the thyrotrophic cells appeared marginally smaller and less active ... -
Histological studies on the testes of pond specimens of Tilapia nigra (Gunther) (Pisces: Cichlidae) and their implications of the pituitary-testis relationship
(University of Nairobi, 1970)T. nigra pond specimens were studied histologically and histochemically to investigate the relative development of the spermatogenetic and the interstitial tissue elements. The earliest phases showed active spermatogenesis ... -
Endocrine regulation of reproduction in Tilapia
(University of Nairobi, 1972)Tilapia, the dithiocarbamoylhydrazine derivative Methallibure (I. C. I. 33828), added as a suspension in 6 daily doses of 1 mg/liter of aquarium water each week, effectively suppresses gonadotrophin production after 5 ... -
Growth features of Acacia tortilis and Acacia xanthophloea seedlings and their response to cyclic soil drought stress
(University of Nairobi,, 2001)Seedlings of Acacia tortilis (Forsk) Hyne and Acacia xanthophloea Benth. were raised under controlled glasshouse conditions. Control plants were watered daily while other treatments involved withholding water for 2, 4 and ... -
Reproductive Biology Of Lions (panthera Leo Massaica Neumann) In Nairobi National Park
(University of Nairobi, 1973-12)This study was conducted from June 1968 to July 1969 and from August 1970 to December 1972 with information available for the intervening period as well as for the first half of 1968, giving records for approximately 5 ... -
The effect of temperature and gonadotropin on testicular steroidogenesis in Sarotherodon (tilapia) mossambicus in vitro
(University of Nairobi, 1983-04)Testes of sexually mature Sarotherodon mossambicus were incubated at 15, 22, 30, and 40° with (a) tritiated testosterone and (b) salmon pituitary extract. Formation of 11-keto- and 11β-hydroxytestosterone from the tritiated ... -
Reproduction of the North American blackbass, Micropterus salmoides (Lacépède), in an equatorial lake, Lake Naivasha, Kenya
(University of Nairobi, 2008-06). In contrast to its North American relatives, the Lake Naivasha blackbass, Micropterus saimoides (Lacepdde) has a prolonged spawning season of 8 months between June and January, peaking in August to November. This season ... -
Decomposition of grasses in Nairobi National Park Kenya
(University of Nairobi, 1985)The litter-bag technique was used to estimate decomposition rates of standing-dead grass and grass litter in Nairobi National Park. Decomposition was extremely slow. After almost 2 years standing-dead and litter had lost ... -
Actions of prolactin on human renal function
(University of Nairobi, 1971)The action of sheep prolactin on human renal function was investigated in conscious, adult, male volunteers. The prolactin was given by intramuscular injection, and the dose used was within the physiological range for ... -
Impacts of pesticides on human health and environment in the River Nyando catchment, Kenya
(University of Nairobi, 2014-03)River relies on rain fed agriculture. Important crops grown include cereals, cash crops fruits and vegetables. Farming is one of the contributors’ of pollution to Lake Victoria. Organophosphates and other banned ... -
Sequence and geochronology of the Kenya rift volcanics
(University of Nairobi, 1971)The Upper Cenozoic volcanic formations associated with the Kenya rift valley are divided into seven main stratigraphic groups representing widespread ‘plateau’ formations, and a number of central volcano groups of more ... -
Physiologic Manifestations Of Stress From Capture And Restraint Of Free-ranging Male African Green Monkeys (cercopithecus Aethiops)
(University of Nairobi,, 2004)Adrenal gland weights, stomach mucosal lesions, and morning serum cortisol and prolactin levels were measured in 15 juvenile and adult male African green monkeys (Cercopithecus aethiops) that were shot by a hunter, euthanized ... -
Evaluation of Beilschmiedia seed gum as a tablet binder.
(University of Nairobi,, 2009)Beilschmiedia gum derived from the edible seeds of Beilschemiedia mannii (family Lauraceae) was evaluated for its binding properties at a concentration range of 0.5-10% w/w in paracetamol tablets with official gelatin as ... -
International Symposium on Natural Immunity to HIV: A Gathering of the HIV-Exposed Seronegative Clan
(University of Nairobi,, 2010)This supplemental issue of the Journal of Infectious Diseases collects summaries of oral presentations on the phenomenon of natural immunity to human immunodeficiency virus type (HIV) infection that were given at the ... -
The Use Of Wood Ash For The Protection Of Stored Cowpea Seed ( Vigna Unguiculata (l.) Walp.) Against Bruchidae ( Coleoptera)
(University of Nairobi, 1996) -
Failure of mammalian TRH to stimulate thyroid function in the
(University of Nairobi, 1973)Synthetic TRH in doses as high as 100 μg per 50 g (average) lungfish produced no change in radioiodine metabolism in the thyroid gland. In similar animals 1.0 IU of bovine TSH clearly was stimulatory.