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Browsing College of Pure Science (COPAS) by Issue Date

Browsing College of Pure Science (COPAS) by Issue Date

Now showing items 1-20 of 310

The use of catechins as biochemical markers in diversity studies of tea (Camellia sinensis)

Magoma, G.N.; Wachira, F.N.; Obanda, M.; Imbuga, M.; Agong, S.G. (Kluwer Academic Publishers, 1999-03-29)

The concentrations of catechins in a Kenyan tea germplasm collection of 102 accessions were determined by HPLC. Total green leaf catechin concentrations and the ratio of dihydroxylated to trihydroxylated catechins were used ...
Volatile Constituents of Mandarin (Citrus reticulata Blanco) Peel Oil from Burundi

Njoroge, Simon Muhoho; Mungai, Hellen Njoki; Koaze, Hiroshi; Phi, Nguyen Thi Lan; Sawamura, Masayoshi (Taylor & Francis Group content, 2006-11)

The essential oil constituents of mandarin (Citrus reticulata Blanco) grown in Burundi were extracted by coldpressing method and analyzed by GC and GC/MS. Fifty-eight constituents, amounting to 97.2% of the total ...
Bacterial diversity in the intestinal tract of the funguscultivating termite Macrotermes michaelseni (Sjöstedt)

Mackenzie, Lucy Mwende; Muigai, Anne Thairu; Osir, Ellie Onyango; Lwande, Wilber; Keller, Martin; Toledo, Gerardo; Boga, Hamadi Iddi (Academic Journals, 2007-03-19)

Microorganisms in the intestinal tracts of termites play a crucial role in the nutritional physiology of termites. The bacterial diversity in the fungus-cultivating Macrotermes michaelseni was examined using both molecular ...
Solid-phase extraction of Zn(II), Cu(II), Ni(II) and Pb(II) on poly(vinyl chloride) modified with 3-ferrocenyl-3-hydroxydithioacrylic acid, and their subsequent determination by electrothermal atomic absorption spectrometry

Kiptoo, Jackson K.; Ngila, J. Catherine; Silavwe, Ned D. (Springer-Verlag, 2007-03-24)

A new chelating resin based on poly(vinyl chloride) functionalized with 3-ferrocenyl-3-hydroxydithioacrylic acid has been synthesized and characterized. The resin was used as a packing material in an off-line mini-column ...
Variable amplitude loading in en8 (080m40) steel: a detailed experimental study of crack growth

Ng'ang'a, S. P.; James, M.N. (WILEY, 2007-04-02)

The load interaction effects that occur under variable amplitude loading conditions following single peak overloads, low-high blocks and high-low blocks have been investigated on a commonly used structural steel. A detailed ...
STATUS AND THE POTENTIAL OF STINGLESS BEES (APIDAE: MELIPONINAE) FOR FOREST CONSERVATION AND INCOME GENERATION: A CASE STUDY OF KAKAMEGA FOREST

Macharia, Joseph Kimunge (Zoloogy, JKUAT, 2008)

Stingless beekeeping (meliponiculture) is a unique eco-friendly agro-practice with the potential for environmental amelioration, employment and income generation. Meliponiculture would be ideal for generation of supplementary ...
STATUS AND THE POTENTIAL OF STINGLESS BEES (APIDAE: MELIPONINAE) FOR FOREST CONSERVATION AND INCOME GENERATION: A CASE STUDY OF KAKAMEGA FOREST

Macharia, Joseph Kimunge (Zoloogy, JKUAT, 2008)

Stingless beekeeping (meliponiculture) is a unique eco-friendly agro-practice with the potential for environmental amelioration, employment and income generation. Meliponiculture would be ideal for generation of supplementary ...
Estimation of Finite Population Total Using Quantile Regression

Kinyita, Andrew Mirii (Statistics,JKUAT, 2008)

Sometimes in sampling, we do not usually observe all the survey information. That is, the survey variable Y is not observable for all the population units. Auxiliary variable X, is often used to estimate the unobserved ...
Direct Detection Of Triterpenoid Saponins In Medicinal Plants

Kareru, P. G.; Keriko, J. M.; Gachanja, A. N.; Kenji, G. M. (AJOL, 2008)

Direct detection of saponins in medicinal plants using Fourier Transform Infrared (FTIR) spectroscopy is reported in this paper. Crude dry plant powders were mixed with potassium bromide (KBr) powder and compressed to a ...
Antimicrobial Activity Of Some Medicinal Plants Used By Herbalists In Eastern Province, Kenya

Kareru, P. G; Gachanja, A. N; Keriko, J.M.; Kenji, G. M. (AJOL, 2008)

The aqueous extracts from medicinal plants commonly used by herbalists in Mbeere, and Embu districts of Eastern province, Kenya, were tested for their inhibitory activity against three selected strains of bacteria. All the ...
Influence of Temperature on Virulence of Fungal Isolates of Metarhizium anisopliae and Beauveria bassiana to the Two-Spotted Spider Mite Tetranychus urticae

Bugeme, David Mugisho; Knapp, Markus; Boga, Hamadi Iddi; Wanjoya, Anthony Kibira (Springer Link, 2008-01-29)

Twenty-three isolates of Metarhizium anisopliae (Metschnikoff) Sokorin and three isolates of Beauveria bassiana (Balsamo) Vuillemin (Ascomycota: Hypocreales: Clavicipitaceae) were assessed for their virulence against the ...
Leaf storage conditions and genomic DNA isolation efficiency in Ocimum gratissimum L. from Kenya

Matasyoh, Lexa G.; Wachira, Francis N.; Kinyua, Miriam G.; Muigai, Anne W. Thairu; Mukiama, Titus K. (Academic Journals, 2008-03)

Storage of plant tissues for DNA is important to avoid degradation of DNA. Preliminary studies were conducted on Ocimum gratissimum L. in order to establish the storage conditions for the collected samples before DNA ...
SIAMESE Cooperates With the CDH1-like Protein CCS52A1 to Establish Endoreplication in Arabidopsis thaliana Trichomes

Kasili, Remmy; Walker, Jason D.; Simmons, L. Alice; Zhou, Jing; Veylder, Lieven De; Larkin, John C. (Genetics Society of America, 2009)

Endoreplication, also known as endoreduplication, is a phyogenetically widespread modified version of the cell cycle in which DNA replication is not followed by cell division. The SIAMESE (SIM) gene of Arabidopsis thaliana ...
Antifeedant Activities of the Erythrinaline Alkaloids from Erythrina latissima against Spodoptera littoralis (Lepidoptera noctuidae)

Cornelius, Wanjala W.; Akeng’a, Teresa; Obiero, George O; Lutta, Kweyu P. (Academy of Chemistry of Globe Publications, 2009)

The antifeedant activities of the Erythrina alkaloids from the seeds, seed pods and flowers of Erythrina latissima were investigated in laboratory dual- choice bioassays using third-instar Spodoptera littoralis (Boisduval) ...
Using a machine learning algorithm to develop an intelligent automated teller machine (ATM)

Ndegwa, Walter Kirika (Computer Systems, JKUAT, 2010)

With major advancements having been made in information technology, computers can perform many operations exponentially much faster than a human being. Though the preceding statement is true there are many tasks where the ...
An Intelligent Model for Accessing Market Information via Mobile Phones: Case of Nyeri Farmers

Kiptoo, Sylvester Cheboi (Software Engineering, JKUAT, 2010)

Marketing Intelligence (MI) is defined as the process of acquiring information required to understand the market. It has been used for instance by rural farmers to obtain the price of agricultural commodities in order to ...
Effective Recycling of Cast Aluminium Alloys for Small Foundries

Ng'ang'a, S. P.; Odera, B.O.; Mbuya, T. O.; Oduori, F. M. (JKUAT, 2010)

A method of effective recycling of aluminium castings suitable for small foundries was investigated. Automotive cast aluminium scrap obtained from various scrap vendors was sorted into groups of similar components, namely; ...
Branchless trichomeslinks cell shape and cell cycle control in Arabidopsis trichomes

Kasili, Remmy; Huang, Cho-Chun; Walker, Jason D.; Simmons, L. Alice; Zhou, Jing; Faulk, Chris; Hülskamp, Martin; Larkin, John C. (The Company of Biologists Ltd, 2011)

Endoreplication, also called endoreduplication, is a modified cell cycle in which DNA is repeatedly replicated without subsequent cell division. Endoreplication is often associated with increased cell size and specialized ...
Differential effects of various African nightshade species on the fecundity and movement of Tetranychus evansi (Acari: Tetranychidae)

Murungi, L.K.; Knapp, M.; Salifu, D.; Wesonga, J.; Nyende, A.; Masinde, P.; Torto, B. (Cambridge Journals, 2011)

The tomato red spider mite Tetranychus evansi Baker & Pritchard is a serious pest of solanaceous plants worldwide. Management of this oligophagous pest in African nightshades has been a challenge to smallholder African ...
Effects of Additives on the Fatigue and Impact Properties of Recycled Al-Si Alloy wheels

Kosgey, B. K.; Maube, S. E.; Wangombe, D. N.; Maranga, S. M.; Kihiu, J.M. (2011)

Minor variations in alloy composition are the primary causes of casting rejects and occur even when the normal process conditions prevail. These variations impact significantly in microstructure and mechanical properties ...

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