School of Biological and Physical Science: Recent submissions
Now showing items 261-280 of 933
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Phytochemistry and insecticidal activity of Annona mucosa leaf extracts against Sitophilus zeamais and Prostephanus truncatus
(Taylor and Francis, 2021)A new oleanane type triterpene characterized as 3a, 24-diacetoxy12-oleanene (1) together with known compounds 2-10, were isolated from Annona mucosa leaf extracts. Their structural elucidation was accomplished using ... -
Optical properties and Raman studies of amorphous se-bi thin films
(The African Review of Physics, 2014)Flash evaporated amorphous Se Bi (x = 0, 1, 2, 3, and 4 at. %) thin films of 350 ± 10 thickness have been investigated in the wavelength range of 200nm − 3000nm. It is found that the effect of increasing bismuth content ... -
Investigation of the effect of film thickness on the optical properties of amorphous Se85-xte15sbx thin films
(Africa Journal of Physical Sciences, 2014)Amorphous thin films of Se85-xTe15Sbx (x = 0.0, 0.5, 2.5, and 5.0 at. %) deposited by flash evaporation technique, have been investigated in the wavelength range of 500nm-3000nm. It is found that the effect of increasing ... -
Compositional and Thickness Effects on the Optical Properties of Zinc– Doped Selenium–Antimony Thin Films
(AJOL, 2018)Chalcogenide system of antimony (Sb)-selenium (Se)-zinc (Zn) system is a promising semiconductor for phase change memory devices due to its thermal stability and low power consumption. The study investigated the effect ... -
Investigation of long acoustic waveguides for the very low frequency characterization of monolayer and stratified air-saturated poroelastic materials
(Elsevier, 2021)When sound propagates in a porous medium, it is attenuated via several energy loss mechanisms which are switched on or off as the excitation frequency varies. The classical way of measuring acoustic energy loss in porous ... -
Growth and Gas Exchange Responses of Maize and Banana Plants in an Intercrop with Agroforestry Tree Species in Vihiga County, Kenya
(Asian Journal of Research in Crop Science, 2021)Agroforestry trees have been reported to improve soil fertility through nitrogen fixation, coupled with leaves and twig decomposition. High human population pressure in Vihiga County has led to reduced land area under ... -
Determinants of revenue management practices and their impacts on the financial performance of hotels in Kenya: a proposed theoretical framework
(SpringerOpen, 2021)This conceptual paper aims at identifying a theoretical framework for the determinants of revenue management (RM) practices and their impacts on the financial performance of hotels. To create this framework, a two-phased ... -
Developing a livelihood: conservation model for the Kakamega Forest region, Kenya using experiences from Berchtesgaden National Park, Germany
(Routledge, 2021)Active participation of local community of Kakamega Forest in conservation has rather been elusive. Conservation efforts directed at the Forest have resulted into more resource use restrictions instead of access. Furthermore, ... -
Environmental management practices implemented by the hotel sector in Kenya
(Routledge, 2021)Environmental management has become an important concept among the hotel sector globally following the negative impacts of its operations on the natural environment. In this regard, hotels have embarked on a course of ... -
Association Between Visual Acuity, Ocular Pathology and Refractive Error with Computer Vision Syndrome: Cross Sectional University Study in Kenya
(Research squire, 2020)Background: Numerous factors have been shown to reduce symptomatic and non-symptomatic forms for computer vision syndrome. However, little is known on the impact among computer users diagnosed with severe symptoms of ... -
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 ... -
Four Domains Of Parenting In Kenya
(Routledge, 2021)The goals of this study were to track changes in parental warmth and rules/limit-setting over time and to examine parents’ age at the time of their child’s birth, parents’ education, and child gender in relation to changes ... -
Effect of nitrogen application on the expression of drought-induced root plasticity of upland NERICA rice (vol 22, pg 180, 2019)
(TAYLOR & FRANCIS LTD, 2020)This study evaluated the effect of three N fertilization levels 60 (low), 120 (medium), and 180 (high) kg N ha−1 and soil moisture content gradients created by a line-source sprinkler on the expression of plasticity in ... -
Ecosystem productivity and CO2 exchange response to the interaction of livestock grazing and rainfall manipulation in a Kenyan savanna
(Environmental and Sustainability Indicators, 2021)Savanna ecosystems in Kenya are experiencing altered rainfall amount and increased grazing pressure. These environmental alterations occur simultaneously and impact on productivity and CO2 exchange of the savanna in unclear ... -
New compounds with antimicrobial activities from Elaeodendron buchananii stem bark
(Journal of Asian Natural Products Research, 2018)The plant species Elaeodendron buchananii Loes is widely used in folklore medicine to manage microbial infections in Kenya. Previous studies on the plant fruits and root bark revealed the presence of steroids and ... -
An Assessment of the Viability and Potential of Bamboo Micro Enterprises in Environmental Conservation and Poverty Alleviation in Nairobi City, Kenya
(Maseno University, 2010)Nairobi, Kenya‟s capital city has undergone rapid urbanization which has been associated with a number of development challenges. Key among these challenges is deterioration in urban environment and urban poverty. Bamboo ... -
Face attack and patients’ response strategies in a Kenyan hospital†
(Journal of social linguistics, 2010)Social power can be exercised by face attack where power differentials are sufficiently great and significant retaliation or sanctions are unlikely. Such exercise of social power is common in military contexts. It is not ... -
Sorghum and Salinity II. Gas Exchange and Chlorophyll Fluorescence of Sorghum under Salt Stress
(Wiley.com, 2004)Photosynthetic activity decreases when plants are grown under saline conditions leading to reduced growth and productivity. Leaf growth, gas exchange, and chlorophyll fluorescence of two sorghum [Sorghum bicolor (L.) Moench] ... -
Toward a size scale-up cold sintering process at reduced uniaxial pressure
(Journal of America ceramic library, 2019)Cold sintering is a low-temperature powder process methodology that enables the densification of ceramics and ceramic-based composites at significantly reduced times and temperatures. Although the general notion of required ... -
Sickle cell trait is not associated with endemic Burkitt lymphoma: An ethnicity and malaria endemicity-matched case–control study suggests factors controlling EBV may serve as a predictive biomarker for this pediatric cancer
(International Journal of Cancer, 2013)Endemic Burkitt lymphoma (eBL) is associated with Epstein–Barr virus (EBV) and Plasmodium falciparum coinfections. Malaria appears to dysregulate immunity that would otherwise control EBV, thereby contributing to eBL ...