25 research outputs found
Investigation of the reactivity of AlCl3 and CoCl2 toward molten alkali-metal nitrates in order to synthesize CoAl2O4
Cobalt aluminate CoAl2O4 powder, constituted of nano-sized crystallites, is prepared, involving the reactivity of AlCl3 and CoCl2 with molten alkali-metal nitrates. The reaction at 450 °C for 2 h leads to a mixture of spinel oxide Co3O4 and amorphous γ-Al2O3. It is transformed into the spinel
oxide CoAl2O4 by heating at 1000 °C. The powders are mainly characterized by XRD, FTIR, ICP, electron microscopy and diffraction, X-EDS and diffuse reflection. Their properties are compared to those of powders obtained by solid state reactions of a mechanical mixture of chlorides or oxides submitted to the same thermal treatment
Eco-epidemiology of porcine trypanosomosis in Karim Lamido, Nigeria: prevalence, seasonal distribution, tsetse density and infection rates
Impact of Trypanosomosis on Food Security in Nigeria: A Review
Abstract: The aims of these review is to further highlight the direct and indirect impact of trypanosomiasis on food security in Nigeria. The direct impact on livestock productivity, include reduce meat and milk off take, calving rate, increase in calf mortality, decreases both lamping and kidding rates in sheep, goat and increase in cost of live stock management. Indirect impact of trypanosomosis include decrease crop production, decrease traction power, reduces work efficiency of both man and animals. The economic contribution of crop and animal production in ensuring food security in Nigeria is indispensable. Livestock production constitutes an important component of Nigeria agricultural development; animal protein raw materials for agro allied based industries. In conclusion, the potential for increasing livestock production can only be fully realized if the animals are adequately protected against the adverse effects of periodic stresses and diseases. Profitability of animal product demand efficient husbandry of animals, as disease remains a profit limitation factor in many tropical countries. For sufficient livestock production to be fully realized to meet the growing population of Nigeria, integrated approach to trypanosomiasis control is required to increase the present level of livestock production
Influence of production conditions on the densification of zirconia powders obtained from acetates
Physico-chemical and technological properties of ceramic tiles: Role of clay minerals on as pressed and dried compacts properties
Chemical, mineralogical and technological properties of an experimental clay are investigated with the aim to substitute for other clays used at present in factories. Flexural strength distributions of green and dry compacts were analysed and correlated to microstructural features with a view to evaluate their drying ability and their mechanical reliability
Physico-chemical and technological properties of ceramic tiles: Role of clay minerals on as pressed and dried compacts properties
Chemical, mineralogical and technological properties of an experimental clay are investigated with the aim to substitute for other clays used at present in factories. Flexural strength distributions of green and dry compacts were analysed and correlated to microstructural features with a view to evaluate their drying ability and their mechanical reliability
Species Diversity, Abundance and Seasonal Occurrence of Some Biting Flies in Southern Kaduna, Nigeria.
A survey of biting dipterans was conducted in Kaura LGA of Kaduna State
between November 2000 and October 2001. Fifteen species of biting flies
were caught in two families, Tabanidae and Muscidae distributed in the
following 4 genera: Tabanus 10, Haematopota 2, Chrysops 1 and Stomoxys
2. The genus Stomoxys represented by Stomoxys calcitrans
Linnaeus and S. nigra Macquart had the highest abundance (62.5%),
followed by the Tabanus (34.6%), Haematopota (1.8%) and Chrysops
(1.1%). Generally, more flies were collected during the wet (1431;
85.1%) than the dry season (250; 14.9%) with some species occurring all
year round. The widespread presence of haematophagous dipterans in the
study area suggest that they could be playing a greater role in disease
transmissions than previously thought. Optimum temperatures that
stimulate rapid reproduction appear to fall between mean temperatures
of 22.8-24.1°C. The species showed a general increase in relative
abundance during the wet season and a decline in the dry season. No new
country record was found
Trypanosomosis in hunting dogs in kaduna, north central Nigeria: implications on the disease in humans
A parasitological survey of hunting dogs during the month of August, peak of rainy season, was carried out in Kaduna, North Central Nigeria using the standard trypanosome detection techniques and concentration methods. This was with the view of assessing the socio-economic importance and public health implications of canine trypanosomosis in the area. About 3mls of cephalic blood was collected into Bijou bottles containing ethylene diamine tetra acetic acid (EDTA) as anticoagulant. Identification of trypanosome, was done using Giemsa stained films. The over all infection rate in the hunting dogs was 17.39%. The infection due to trypanosome brucei (75%) was higher compared to infection due to T. congolense (25%), while the packed cell volume of infected dogs was significantly (P≤0.05) lower than that of parasitogically negative ones. The study confirms the resurgence of canine trypanosomosis in Nigeria and the roles of dogs as reservoir hosts for hunting infective T. brucei gambiense in the area. It was concluded that hunting occupation predisposes to human trypanosomosis in Nigeria. Keywords: Hunting dogs, Trypanosomosis, infection rate, Nigeria. Journal of Biomedical Investigation Vol. 4 (1) 2006: pp. 15-1
Recyclage de déchets industriels, phosphogypse et cendres volantes, dans des matériaux de construction
L’industrie des céramiques traditionnelles, en particulier celle des matériaux de construction, connaît actuellement un important essor au Maroc. Une demande croissante se traduit par la création ou l’expansion de plusieurs unités de production (cimenteries, briqueteries,…). Ces matériaux, produits en fort tonnage, sont susceptibles de confiner certains déchets industriels dans un souci de respect environnemental. Ce confinement ne doit avoir de retombées négatives ni sur la performance du matériau, ni sur la santé. Notre objectif est le recyclage de ces déchets (produits à plusieurs millions de tonnes annuellement) qui sont actuellement soit rejetés en mer ou stockés par leur mise en terril. L’objet de ce travail est le recyclage de deux sous produits industriels : le phosphogypse (rejet de la production de l’acide phosphorique) et les cendres volantes (résidus de centrales thermiques) par leur intégration dans la formulation de produits de la terre cuite. L’avantage est que la microstructure de ces matériaux présente une phase vitreuse susceptible de confiner certains métaux lourds sources de radioactivité. Plusieurs formulations ont ainsi été préparées. Les produits sont caractérisés (DRX, porosimétrie, comportement mécanique,..) en fonction de leur teneur en additifs, de la température de cuisson,… .
L’ensemble des résultats est encourageant et nous permet de proposer les paramètres optimaux pour une substitution avantageuse des argiles par le phosphogypse et les cendres volantes pour l’élaboration de briques de terre cuite
Seasonal Variation in Trypanosomosis Rates in Small Ruminants at the Kaduna Abattoir, Nigeria
Seasonal variation in trypanosome parasitological infection rates in
small ruminants was studied at the Kaduna Central abattoir, North
Central Nigeria. Blood samples were obtained at slaughter from 320
goats and 209 sheep during the dry and rainy seasons and examined using
the Haematocrit Centrifugation Technique, Buffy coat method and Giemsa
stained blood smears. The packed cell volume of the animals were also
obtained. The over all trypanosome infection rate in all small
ruminants was 2.10%. Infection rates in sheep and goats were 2.39% and
1.88% respectively. The infection rates were higher in rainy season
than the dry season while Trypanosoma vivax was the dominant
infecting trypanosome in all the ruminants followed by T. congolense
and T. brucei. Infection rates observed here were relatively high and
confirmed the resurgence of animal trypanosomosis in the country and
its threat to sustainable livestock production