检索结果-南通市图书馆

Open Journal of Inorganic Chemistry 2017年第3期7卷 75-87页

作者： Clémence T. Eboga Gouet Bebga Yves A. Mbiangué emmanuel N. nfor Patrick L. Djonwouo Michel M. Bélombé Justin Nenwa Inorganic Chemistry Department University of Yaounde Yaounde Cameroon Chemistry Department Higher Teacher Training College University of Yaounde 1 Yaounde Cameroon Chemistry Department Higher Teacher Training College University of Maroua Maroua Cameroon Department of Chemistry University of Buea Buea Cameroon

Reaction of Ba0.50[Ag2Cr(C2O4)3]·5H2O with Ag2SO4 in an aqueous solution of sulfuric acid (pH ≈ 3) yielded the silver(I)/chromium(III) oxalate salt H0.50[Ag2.50Cr(C2O4)3]·5H2O (1). Compound 1 can be best described as an anionic silver-deficient oxalatochromate(III) complex [Ag2.50Cr(C2O4)3]0.5- with nanochannels containing hydrogen-bonded water molecules and protons. Thermal analyses show significant weight losses corresponding to the elimination of water molecules of crystallization followed by the decomposition of the network.

关键词： Silver-Deficient Oxalatochromate(III) Water-Filled Nanochannels Protons Thermal Analysis Crystal Structure

Risk Factors Contributing to Microbiological Contamination of Boreholes and Hand Dug Wells Water in the Vina Division, Adamawa, Cameroon

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Advances in Microbiology 2021年第2期11卷 90-108页

作者： Tangwa Bernard Viban Okah-Nnane Ndode Herman Tangwa Clotilda Layu Oumarou Palou Madi emmanuel N. nfor Manchang Tanyi Kingsly Bah Germanus Ngu Ngwa Victor Ngakou Albert Institute of Agricultural Research for Development Ngaoundere Cameroon Department of Chemistry University of Buea SWR Buea Cameroon Faculty of Agriculture and Veterinary Medicine University of Buea Buea Cameroon University of Ngaoundere Ngaoundere Cameroon

This study examined the sanitary conditions of public boreholes and hand dug wells water in relation to pathogenic bacteria isolated in water samples. To assess the suitability of drinking water, sanitary inspection of surroundings of the sources was conducted, membrane filtration technic was used to trap the microorganisms in the water sample and other standard microbiological technics were applied to check the heterotrophic plate counts, total coliforms, fecal coliforms and some pathogenic bacteria in the samples. It was observed that there were no delineated protection zones around many boreholes (61.19%) and in almost all hand dug wells;thus, hand dug wells were pruned to more contamination than boreholes. Heterotrophic plate counts of boreholes were significantly different between (p E. coli 157H in some. Risk assessment of factors contributing to water contamination showed that: pumps manipulation with feet, other sources of contamination such as wastewater dumps, within 10m were significantly associated to boreholes contamination with Salmonella spp, Staphylococcus aureuse, fecal coliform (p = 0.01);in hand dug wells, presence of latrine or septic tank soak-away within 10 m of the wells, poor depth and lack of internal lining, uncapped wells, presence of trees near the wells, animal and birds feces, were significant and associated to contamination with Salmonela spp., B. cepaceae, S. aureus E. coli 1 (p < 0.05). Generally water collection points are marked with very poor sanitary conditions and this situation may not change unless the contaminating risk factors are fixed and sanitary measures are taken.

关键词： Boreholes Hand Dug Wells Risk Factors Sanitation E. coli 157H Public Health

A Novel Mixed Ligand Dinuclear Complex of Cobalt (II): Synthesis, Characterization and Magnetic Studies

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Crystal Structure Theory and Applications 2014年第1期3卷 22-29页

作者： emmanuel N. nfor Luke L. Keenan Justin Nenwa Peter T. Ndifon Romanus N. Njong Christelle N. T. Dzesse Offiong E. Offiong Department of Chemistry University of Bath Bath UK Department of Chemistry University of Buea Buea Cameroon Department of Inorganic Chemistry Coordination Chemistry Laboratory University of Yaounde I Yaoundé Cameroon Department of Pure and Applied Chemistry University of Calabar Calabar Nigeria

A novel dinuclear complex [Co2(atr)3(mal)2(H2O)2]·4H2O(1) (atr = 4-amino-1,2,4-triazole and mal = malonic acid) containing mixed N and O-donor atoms has been prepared and structurally characterized. The structure is made up of the symmetrically 1, 2, 4-triazole bridged [Co2(atr)3(mal)2(H2O)2] moiety and four lattice water molecules. The single crystal X-ray analysis reveals that the complex has a distorted octahedral structure. Magnetic susceptibility measurements reveals that antiferromagnetic interactions exists between the high spin Co(II) ions within the dinuclear unit.

关键词： Dinuclear Complex Cobalt (II) Complex Magnetic Properties Mixed Triazole-Malonate

Synthesis, Molecular Structure, Anti-Plasmodial, Antimicrobial and Anti-Oxidant Screening of (E)-1-(Phthalazin-1-yl)-1-[(Pyridin-2-yl)Ethylidene]Hydralazine and 1-[2-(1-(pyridine-3- yl)ethylidene)hydrazinyl]phthalazine

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

International Journal of Organic Chemistry 2021年第3期11卷 91-105页

作者： Angelbert F. Awantu Godfred A. Ayimele Jean Jules K. Bankeu Edouard A. Nantia Patrick V. T. Fokou Fabrice F. Boyom emmanuel N. nfor Bruno N. Lenta Silvère A. Ngouela Department of Chemistry The University of Bamenda Bambili Cameroon Department of Chemistry University of Buea Buea Cameroon Department of Biochemistry The University of Bamenda Bambili Cameroon Department of Biochemistry University of Yaoundé I Yaoundé Cameroon Department of Chemistry Higher Teachers’ Training College University of Yaoundé I Yaoundé Cameroon Department of Organic Chemistry Faculty of Science University of Yaoundé I Yaoundé Cameroon

Two new hydralazine hydrochloride-derived Schiff bases: (E)-1-(Phthalazin- 1-yl)-1-[(Pyridin-2-yl)Ethylidene]Hydralazine (PPEH), and 1-[2-(1-(pyridine- 3-yl)ethylidene)hydrazinyl]phthalazine (PEHP), were synthesized and partially characterized by spectroscopic and crystallographic methods including IR and X-ray. The single-crystal X-ray diffraction (SCXRD) analysis of PEHP indicates that the hydralazine moiety of both ligands possesses the exocyclic C=N bond. Both, PPEH and PEHP were tested as antimicrobials and antiparasites. Just PEHP could be considered as slightly antiplasmodial and antibacterial agent. In effect, PPEH showed low antimicrobial activity against one bacterial strain with Minimum Inhibitory Concentration (MIC) value of 250 μg/ml while PEHP showed very interesting activity against 18 out of 19 bacterial strains with MIC of 31.25 - 250 μg/ml compared to the standard drug, amoxicillin. PPEH and PEHP showed higher reducing activity on ferric ions compared to Vitamin C. On the other hand, both hidrazaline synthetized derivatives showed as better reducing agents than Vitamin C on ferric io

关键词： Schiff Base Hydralazine Hydrochloride Anti-Plasmodial Activity Antimicrobial Activity Anti-Oxidant Activity