ABSTRACT The molecular modification of purely organic drugs by the incorporation of a metal atom is an active area of research. However, there is paucity of data in the use of half sandwich organometallic fragments and in particular the cationic iron half sandwich, [ɳ5-C5H5(CO)2Fe]+, in structural modification of drug molecules. The cationic iron half sandwich organometallic fragment provides a metal centre that could participate in biochemical reactions with potentially the desirable benefi...
ABSTRACT Tick-borne infections of livestock are wide-spread in Africa and present a great constraint to livestock development, particularly in the improvement of local breeds. This problem is compounded by the high susceptibility of foreign breeds of livestock being used to improve livestock productivity in many African countries. Brown Ear tick, Rhipicephalus appendiculatus, is the most economically important of the 40-70 African tick species. This is due to the fact that it is a highly eff...
ABSTRACT Clean water is an essential commodity for a healthy nation. A fifth of all water used in the world is obtained from groundwater. In arid and semi-arid areas, groundwater is the main source of water for domestic and irrigation purposes. The semi-arid climate, few perennial water bodies and growing population in Mbeere South, Embu County has resulted into increased use of groundwater for both domestic and irrigation necessities. This has put pressure on these water sources leading...
ABSTRACT In African tropical zones, cereals are kept as grains or flour in storage structures and constitute important source of income for farmers. Protecting stored product in this case is an emergency to ensure food security for people living in these areas of deficiency where agriculture is not highly productive. Some of the pursued measures include physical, traditional, and biological methods; and application of synthetic pesticides. The above techniques have some problems including con...
ABSTRACT The study of excitation of helium atom by positron impact has drawn considerable attention since the prediction of existence of the positron by Dirac in 1928.This is due to the fact that the study of atomic collisions forms the basis for understanding of many scientific phenomena in the planetary atmosphere and Astrophysical science. In this study the excitation of helium atom to the is state by positron impact using the Distorted Wave formula has been done. Previously, studies have...
ABSTRACT The study focused on the possible oxidation of various nitrogen bases by molybdenum(II) and tungsten(II) halocarbonyls, formation of zerovalent aminecarbonyl metal complexes and mode of coordination of nicotine to molybdenum and tungsten. Aminecarbonyls of the type M(CO)3L3 (M=Mo, W; L= CH3NH2, CH3CH2)2NH), M(CO)4TMEDA and M(CO)5nicotine were prepared by a reaction of the halocarbonyls [M(CO)4X2]2 (M=Mo, W; X=Br or Cl) with selected nitrogen bases. The crystal structurse of Mo(CO)4TM...
ABSTRACT Chlorine in drinking water, surface or underground water is a concern of public health. This is because chlorine reacts with nitrogen containing organic compounds to form polychlorinated complexes that are carcinogenic. However, chlorine is dissolved in water for the sake of disinfecting with a view to killing pathogens in water to make it safe for human consumption. After that initial addition, some chlorine is left in the water and continues with the chlorination process of the org...
ABSTRACT Dark green leafy vegetables (DGLV) such as Amaranthus spp are known to be good sources of beta-carotene, a pro-vitamin A carotenoid and a highly potent anti-oxidant. Anti-oxidants terminate chain reactions, prevent recurrence and also prevent the formation of unstable oxygen which otherwise can initiates a chain reaction that propagates to cancerous cell. Cancer is strongly attributed to poor diet as well as lack of exercise. New cancer cases are diagnosed daily, leading to a project...
ABSTRACT This study reports a new method of pre-concentrating Zn2+, Fe2+, Mn2+, Mo6+ and I- ions present in food stuffs using modified bio-sorbents. These elements are in low levels in many food stuffs commonly consumed and some are way below the recommended daily intake (RDI). Examples of mitigating such situations include the addition of iodine to table salt in minute portions. However, table salt in foods increases sodium levels causing problems to consumers with high blood pressure...
ABSTRACT In this article, a time truncated life test based on two-stage group acceptance sampling plan is proposed for lifetime of an item follows odd generalized exponential log-logistic distribution (OGELLD). The ability about the lot acceptance can be made in the first or second stage according to the number of failures from each group. The optimal parameters for the proposed plan are determined such that both producer’s as well as consumer’s risks are contented simultaneously for the...
ABSTRACT The syntheses of benzoxazinophenothiazine was thoroughly explored. Condensation of 2,3-dichloro-1,4-naphthoquinone with 2-amino-4-nitrophenol, 4,5-diamino-6-hydroxypyrimidin-2-thiol and 2-amino-6-chlorophenol, respectively in alkaline medium yielded the intermediates: chloro-10-nitrobenzo[a]phenoxazin-5-one(136), 11-amino-6-chloro-9-thiol-8,9-diazabenzo[a]phenoxazin-5-one (148) and 6,8-dichlorobenzo[a]phenoxazin-5-one (160). Further treatment of the intermediates with 2-aminothiophe...
Complexing capacities of calcium and magnesium with natural organic matter (NOM)/selected organic chelating agents, in the presence and absence of other major and trace cations in water, were studied by anodic and cathodic square wave stripping voltammetry techniques (ASWSV and CSWSV). Under predetermined and optimized physico-chemical parameters (pH, temperature and ionic strength), calcium-NOM complexation and competitive complexation by other elements of known concentration (Pb, Zn, a...
ABSTRACT The improvement of the combustion properties of coal and biomass by blending and carbonization was investigated. Proximate and ultimate analysis of coal, sawdust, corn cob and their blends were carried out using ASTM methods. The proximate and ultimate analyses were repeated on the five blends after carbonization at 500oC for one hour. Ten mixtures of coal-sawdust and coal-corn cob blends were made into briquettes using starch binder. The calorific values of the samples were determin...
ABSTRACT Evaluation of chemical composition of C. citratus and M. spicata, gave the following proximate composition on dry weight basis: moisture; (1.67±0.29%) and (2.67±0.29%), ash; (7.52±0.30%) and (24.4±0.35%), crude lipid; (6.67±0.28%) and (6.17±0.27%), crude fibre; (24.67±0.29%) and (2.67±0.29%), crude protein;(17.44±0.12%) and (25.32±0.13%), available carbohydrate (42.03±0.32%) and (39.78±1.11%), energy value; (297.91) and (315.93) respectively. The samples contain min...
ABSTRACT The potentials of Saw dust, Rice husk and Groundnut shells were investigated for bioethanol production. The substrates were pretreated using 2%, 4%, 6% and 8% solution of dilute H2SO4 and HCl. The pretreated substrates were thermally treated at 1050C in order to detoxify them. The pretreated substrates obtained using different concentrations of acids were fermented using Saccharomyces cerevisiae (Yeast). The results show that Rice husk treated with 4% H2SO4 (2.689%dryweight) has...