Abstract: The wastewater treatment industry has identified the discharge of inorganic anions such as phosphate and fluoride into water as a risk to the natural environment and human health. Among various methods used to remove phosphate and fluoride anions, adsorption is widely used because of its low cost, ease of use and simplicity. In this study, cerium-based organic metal frameworks was proposed as adsorbent to remove phosphate and fluoride ions from water.. The aim of this work was to s...
Abstract: Correct identification of misconception is an important first step in order to gain an understanding of student learning. More recently, four- tire multiple choice test have been found to be effective in assessing students ’alternative conception. The purpose of this study was using a four tier test to assess and identify students’ alternative conceptions about chemical thermodynamics concepts. The study was carried out at two preparatory schools of Babile Woreda (Babile and Bi...
Abstract: Eucalyptus globulus is one of the abundant tree species in Ethiopia known for medicinal values of its essential oils. The essential oil composition of a given species may vary with environmental factors. In this study, leaf of essential oil compositions and their antimicrobial activities were analyzed from E. globulus sampled from Haramaya University (HU) and Entoto Park (EP). Essential oils were extracted by steam distillation method and their compositions were analyzed using GC. ...
Abstract: Fermentation is a metabolic process of microorganisms to obtain energy by breaking down organic compound. Sorghum straw was fermented with different concentration substrate (15gm, 30gm , 45g and 60gm) with 0.5% ,1% yeast in different fermentation period (4th day, 8th day, 12th and 16th days) with the aim of ethanol production from Sorghum straw. Among the different substrate concentration 15 gram of substrate mixed with 1% yeast produced high quantity of ethanol on 4th day of ferme...
Abstract: Lead pollution of soil arising from use of leaded ammunition in shooting ranges has received considerable attention from researchers, scientists, policy makers and legislatures. This is due to the adverse health effects associated with exposure to Pb. Eight military shooting ranges found in Botswana were used in this research project. All the eight shooting range soils were polluted with Pb with total Pb concentrations in the range 13-38 386 mg/kg. TAB shooting range soils acc...
Abstract: The ever-increasing population growth and economic developments have led to a demand for energy. Therefore, this has resulted in a depletion and ever rising prices of petroleum diesel, hence increasing environmental degradation. These complications have motivated this study for the search of an alternative eco-friendly and renewable source of energy such as biodiesel. Biodiesel has been found to be a potential alternative fuel for diesel. It has the potential to solve the energ...
Abstract: A series of ester and ether bridged compounds bearing the nitro and amino moieties were synthesized and characterized, in order to assess their ability to potentially serve as antibacterial agents against drug resistant bacteria. All the compounds were obtained at considerable yields while characterization techniques confirmed their successful synthesis. Furthermore, their antimicrobial assessments showed that all the compounds exhibited antibacterial activity against the Gram-nega...
Abstract: The removal of textile wastes is a priority due to their mutagenic and carcinogenic properties. In this study, bismuth oxyhalide was used in the removal of methylene blue (MB) which is a textile waste. The main objective of this study was to develop and investigate the applicability of a bismuth oxyhalide (BiOBr zI (1-z)) solid solutions in the photodegradation of MB under solar and ultraviolet (UV) light irradiation. Methods: Bismuth oxyhalide (BiOBr zI (1-z)) (0 ≤ z ≤ 1) mate...
Abstract: The structure of pyridin-4-ylmethyl 4-nitrobenzoate was determined by the single-crystal X-ray diffraction method. The compound crystallized in a monoclinic system, P21/n, and the unit cell parameters are, a = 9.981(2), b = 12.347(3), c = 10.161(3)Å, β = 101.450(9), Z = 4, V = 1227.3(5)Å3. The crystal structure was solved by intrinsic phasing and refined to final values of R1 = 0.0451 and wR2 = 0.1393
Abstract: The main purpose of this investigation is to analyze the flow and heat transfer behavior of a non Newtonian fluid (Oldroyd B fluid) with hybrid nanostructure subject to externally inclined magnetic field. Cattaneo Christov heat flux model is incorporated in the energy equation. Non linear thermal radiation and viscous dissipation mechanisms are considered. Shooting technique is implemented to accomplish the numerical solution. The outcomes of the numerical computations are discusse...
Abstract: A new hexadentate 2-picolyl-polypyridyl-based ligand (4, 4’-(butane-1, 4-diylbis(oxy))bis(N, N-bis(pyridin-2-ylmethyl)aniline)) (2BUT) (1) and its corresponding Ru(II/III) complexes were synthesized and characterized, followed by assessment of their possible bioactive properties towards drug-resistant and non-drug-resistant bacteria. Spectroscopic characterization of the ligand was done using proton NMR, FTIR, and ESI-MS, which showed that the ligand was successfully synthesized....
Abstract: The quest for the design and synthesis of carbon dots with anti-counterfeit properties that are derived via green, environmentally friendly and economical procedures is a continuous process. Carbon dots (C-dots) derived from biowaste are cheap to synthesize, possess good photo-stabilityand high synthetic yield, making them applicable in the anti-counterfeiting of currency. Herein, we report a novel eco-friendly, cheaper, and faster method for the synthesis of carbon dots with stron...
Abstract: This study was conducted on the Ngaoundaba Crater Lake sediments to infer provenance, weathering conditions, organic matter accumulation, and trace metal concentrations. Ngaoundaba Lake sediments were collected using a manual core sampler at 5 to 8 m water depth. Two sediment cores from the littoral and center of the lake were analyzed for grain size distribution, water content (WC), organic matter content, mineralogy, and major and trace element concentrations. The Ngaoundaba sedi...
Abstract: The African mosquito species Anopheles gambiae and An. funestus are ranked high among the world's most efficient vectors of human malaria. Their juvenile stages develop in aquatic environments while adults are terrestrial. Chemical signals guide gravid females of these vectors to their egg-laying sites. Several attributes of a pond including presence of other organisms influence egg hatching success and larval survival. Gravid An. gambiae females strongly discriminate among potenti...
Abstract: This thesis describes the asymmetric phase-transfer catalysed (PTC) Darzens condensation of aldehydes and ketones with the chiral reagents 1-menthyl chloromethanesulphonate, (S)-(-)-N-chloromethylsulphony l-2 -thoxymethylpyrrolidine,(S)-(-)-tert-butyl N-(chloromethylsulphonyl)prolinate and (+)-0-methyl-N-(chloromethylsulphonyl)ephedrine using triethylbenzylammonium chloride (TEBA) as the phase-transfer catalyst.The chiral reagent 1-menthyl chloromethanesulphonate was obtained by th...