Natural & Applied Sciences

Natural & Applied Sciences Research Papers/Topics

Drought Responsive Genes In Tea Cultivars Grown In Kenya.

ABSTRACT Tea is one of the most popular non-alcoholic beverages worlwide, and a leading foreign exchange earner and source of livelihood to over three million people in Kenya. However, tea growing areas in Kenya experience abiotic stresses with drought been the most predominant. Tea plants tolerate drought through poorly understood physiological, cellular/biochemical and molecular processes. Development of tea cultivars adapted to water-deficit stress greatly relies on an understanding of me...

Efficiency Evaluation In Modelling Stock Data Using Arch And Bilinear Models

ABSTRACT Modelling of stock market data has witnessed a significant increase in literature over the past two decades. Focus has been mainly on the use of the ARCH model with its various extensions due to its ability to capture heteroscedasticity prevalent in the financial and monetary variables. However, other suitable models like the bilinear models have not been exploited to model stock market data so as to determine the most efficient model between the ARCH and bilinear models. The underl...

Computational Statistical Model For Group Testing With Retesting

ABSTRACT Screening of pooled urine specimen was suggested during the Second World War as a method for reducing the cost of detecting syphilis in U.S. soldiers. Recently, pooling has been used in epidemiological studies for screening of human immunodeficiency virus HIV/AIDS antibody to help curb the spread of the virus. Pooling reduces the cost but also – and more importantly – offers a feasible way to lower the misclassifications associated with labeling specimens when imperfect tests are...

Investigation Of Secondary Metabolites From Withania Somnifera And Hagenia Abyssinica For The Control Of Maize And Bean Pathogens

ABSTRACT Maize (Zea mays L.) and the common bean (Phaseolus vulgaris L.) are the two most important staple foods not only in Kenya but also in Sub-Saharan Africa. Despite the importance of these two crops, there have been production constraints due to diseases caused by bacterial and fungal pathogens. The major diseases affecting maize production are Gray Leaf Spot (GLS) and maize ear rot which are caused by fungal pathogens, Cercospora zeae-maydis, Fusarium moniliforme and Fusarium graminear...

Analysis Of Total Hla-G Levels And Its Isoforms In Placental Malaria

ABSTRACT The present study examined the total, membrane bound and soluble HLA-G in infected and uninfected placentas using quantitative real time PCR, ELISA and immunohistochemistry. The total HLA-G transcripts differed significantly (p = 0.009) between infected and uninfected primigravidae. The membrane bound HLA-G transcripts were significantly more abundant than the soluble HLA-G in infected placentas (p = 0.04) in all mothers. At the protein level infected placentas had higher mean level...

The In Vitro Effects Of Lactic Acid Bacteria Screened From Gastrointestinal Tracts Of Lates Niloticus On E. Coli And Salmonella Spp.

ABSTRACT Biopreservation systems in foods are of increasing interest in the food industry. It is the use of naturally occurring microorganisms and/or their inherent antibacterial compounds of defined quality and quantity to extend shelf life and to enhance the safety of foods. Bacteriocinogenic LAB and/or their isolated bacteriocins are considered safe additives, useful to control the frequent development of pathogens and spoilage microorganisms in foods. The spreading of bacterial antibiotic...

Characterisation Of Mosquito Larvicidal Compounds From Cultures Of A Basidiomycete Coriolus Hirsutus

ABSTRACT Mosquitoes transmit serious human diseases, resulting into millions of deaths globally every year. The use of synthetic insecticides to control vector mosquitoes has caused physiological resistance and adverse environmental effects in addition to high operational costs. Mosquito larvicidal compounds from certain plant and fungal species have been reported. Basidiomycetes fungi are known to synthesize a wide range of bioactive secondary metabolites. The objective of this work was to ...

Protein, Anti-Nutrient And Sensory Qualities Of Complementary Food Made From Malted Finger Millet (Eleusine Coracana L.) And Cowpea (Vigna Unguiculata L.) Composite Flour

ABSTRACT Protein-energy malnutrition remains a huge problem for children in sub-Saharan Africa. Kenyan children are no exception. These children rely on cereal porridge such as finger millet (Eleusine coracana) for nutrient supply. Cowpea (Vigna unguiculata), a locally available nutritious legume, could be an excellent complement to lysine-deficient millet diets. Therefore, the present study aimed at innovatively improving the protein quality and sensory properties of the complementary food, ...

Spectrophotometric Determination Of Chromium(Iii) And Chromium(Vi) Using 2-[E)-[{3-[(2-Hydroxybenzylidene) Amino]Phenyl}Imino)Methyl]Phenol

ABSTRACT The Schiff base ligand, 2-[(E)-[{3--[(2-hydroxybenzylidene)amino]phenyl}imino)methyl]phenol was synthesized by condensing 1,3-diaminobenzene and 2-hydroxybenzaldehyde in absolute ethanol. Its Cr(III) and Cr(VI) complexes were equally synthesized. The ligand was characterized via UV, IR and NMR spectroscopy, whereas the complexes were characterized based on UV and IR spectroscopy and conductivity values. Stoichiometric studies indicated 1:1 metal to ligand ratio for both complexes. C...

Nutritional Characterisation Of Baobab (Adansonia Digitata L.) Fruits Based On Africa Geographical Regions

ABSTRACT Baobab (Adansonia digitata L.) is an indigenous fruit tree occurring in the savannah drylands of sub-Saharan Africa. A vast population of people in this region suffers from hidden hunger and malnutrition. Baobab fruits are a source of micronutrients, and their utilization in local diets has potential to improve health of the rural poor. The present study was conducted to determine the nutritional characteristics of baobab pulp and seeds across Africa geographical regions. Mature baob...

Gravity Modeling Of The Paka Geothermal Prospect In Baringo County, Northern Kenya Rift

ABSTRACT Paka volcano is situated in active northern Kenya rift. It is considered one of the geothermal prospects. It has been covered by most studies that focused on the regional tectonic evolution of the East Africa Rift, lithospheric and crustal structural analysis. However, regional analysis overlooked local analysis, where key geothermal structural features like thin massive intrusive and shallow faults that are significant have remained relatively poorly constrained. Hence, the key conc...

Diversity Of Extended-Spectrum Beta-Lactamase Genes In Avian Pathogenic Escherichia Coliin Scavenging Local Chicken In Morogoro Municipality, Tanzania

ABSTRACT The poultry industry, especially chicken production has in recent times faced a major setback due to devastating effects of Extended Spectrum Beta-Lactases (ESBL) producing organisms.This research aimed at investigating the diversity of ESBL genes in avian pathogenic Escherichia coli(APEC) among scavenging local chickens. A total of 400 cloacal and oropharyngeal swabs were obtained, out of which 192 Escherichia coli were isolated. By use of virulence factor profiling, these 192 samp...

Determination Of Benzo[A]Pyrene Levels And Establishment Of Limit Of Detection In Smoked And Oil Fried Lates Niloticus

ABSTRACT Polycyclic aromatic hydrocarbons (PAHs) are a large group of organic compounds included in the European Union and US Environmental Protection Agency (USEPA) priority pollutant list because of their mutagenic and carcinogenic properties. Several studies have shown that exposure to benzo[A]pyrene (BaP), a member of the PAHs increases the risk of cancer. PAHs have been the subject of much concern in the recent years due to their toxic potential. They are known as highly stable contamina...

Agricultural Land Use And Its Implications On Household Food Security In Kisii Central Sub-County, Kenya

ABSTRACT Agricultural land is an important resource for farm households as it forms the base for their livelihoods. Therefore, the manner in which households utilize this resource influences to a large extent their food security situation. This study sought to establish the impact of agricultural land use on household food security in Kisii Central sub-County, Kisii County. To achieve this objective the study focused on the following; examination of the various land use activities, assessment...

Food Additives And Hygienic Status Of Flavoured Fruit Juices Manufactured In Dar Es Salaam, Tanzania

ABSTRACT  The purpose of this study was to assess the quality of juices manufactured and sold for immediate consumption in Dar es Salaam Municipalities, Tanzania. The assessments were based on identifying the levels of preservatives, hygienic practices in manufacturing industries and determine microbiological quality of the juices. High Performance Liquid Chromatographic (HPLC) method was modified and validated for determination of benzoic and sorbic acids, while direct titration method was ...


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