Parasitological prevalence of bovine trypanosomosis in the Faro and Deo division valley of the Adamaoua plateau, Cameroon

A cross sectional survey to determine the distribution and prevalence of trypanosomosis was conducted in the Faro and Deo division valley, on the Adamaoua Plateau in Cameroon. A total of 334 adult cattle from 5 sedentary herds were examined in 5 villages. Dark field buffy coat method, as well as stained thin blood film examination and packed cell volume (PCV) evaluation were the diagnostic techniques used. The overall prevalence of bovine trypanosomosis in the area was 23%. Among the positive animals, 44 (57.1%), 26 (33.8%), 5 (6.5%) and 2 (2.6%) were due to Trypanosoma congolense, Trypanosoma brucei, Trypanosoma vivax and mixed infection (T. congolense and T. brucei) respectively. The mean PCV of the positive and negative animals ranged between 21.1-27% and 28.2-30.1% respectively. The mean PCV of negative animals (29.1±0.7%) was significantly higher than the mean PCV of positive animals (24.2±2.5%) (P< 0.005). In view of the high risk of trypanosomosis, in the area, an integrated intervention approach to which combines the strategic application of appropriate tsetse fly control methods to reduce host fly contact and chemotherapy and chemoprophylaxis against trypanosomosis is recommended.© 2009 International Formulae Group. All rights reserved.Key words: Adamaoua, Cameroon, Cattle, Prevalence, Trypanosomosis, Tsetse

The devices, experimental scaffolds, and biomaterials ontology (DEB): a tool for mapping, annotation, and analysis of biomaterials' data

The size and complexity of the biomaterials literature makes systematic data analysis an excruciating manual task. A practical solution is creating databases and information resources. Implant design and biomaterials research can greatly benefit from an open database for systematic data retrieval. Ontologies are pivotal to knowledge base creation, serving to represent and organize domain knowledge. To name but two examples, GO, the gene ontology, and CheBI, Chemical Entities of Biological Interest ontology and their associated databases are central resources to their respective research communities. The creation of the devices, experimental scaffolds, and biomaterials ontology (DEB), an open resource for organizing information about biomaterials, their design, manufacture, and biological testing, is described. It is developed using text analysis for identifying ontology terms from a biomaterials gold standard corpus, systematically curated to represent the domain's lexicon. Topics covered are validated by members of the biomaterials research community. The ontology may be used for searching terms, performing annotations for machine learning applications, standardized meta-data indexing, and other cross-disciplinary data exploitation. The input of the biomaterials community to this effort to create data-driven open-access research tools is encouraged and welcomed.Preprin

High-performance carbon molecular sieve membranes for hydrogen purification and pervaporation dehydration of organic solventsiek

Ultrathin (∼200 nm) and defect-free carbon molecular sieve (CMS) membranes were successfully fabricated on the inner surface of hierarchically structured porous supports (γ-Al2O3 layer coated α-Al2O3 tubes) via pyrolysis of a polyimide precursor at 700 °C. The chemical structure of the carbonized samples was examined in detail by means of Raman spectroscopy and X-ray photoelectron spectroscopy. From these studies, it was found that the carbonized samples consist of graphitic carbon layers containing sp3-type defects. The synthesized CMS membranes showed an unprecedentedly high H2 permeance of up to 1.1 × 10−6 mol m−2 s−1 Pa−1 and ideal separation factors of 24, 130 and 228 for H2/CO2, H2/N2 and H2/CH4, respectively at 200 °C. Furthermore, outstanding separation factors of 791 and 1946 with a water flux of about 0.5 kg m−2 h−1 were obtained at 70 °C for the pervaporation of 10 wt% water-containing binary mixtures of methanol and ethanol, respectively. These results unambiguously show that the carbon membranes developed in this work possess the potential for high-temperature hydrogen purification and dewatering of organic solvents

Nature, origin and significance of the Fomopéa Pan-African high-K calc-alkaline plutonic complex in the Central African fold belt (Cameroon)

IF=1.219info:eu-repo/semantics/publishe

Synthesis of the catalytically active Mn3O4 spinel and its thermal properties

Tian Z-Y, Mountapmbeme Kouotou P, Bahlawane N, Tchoua Ngamou PH. Synthesis of the catalytically active Mn3O4 spinel and its thermal properties. JOURNAL OF PHYSICAL CHEMISTRY C. 2013;117(12):6218-6224