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: Irish Potato (Solanum tuberosum L.) is one of the world’s most economically important tuber crops belonging to the family Solanaceae. It is a versatile vegetable that is eaten all around the year. The objective of this study was to establish a protocol for in vitro micropropagation of Gudene and Belete Irish potato varieties from lateral bud explants. For shoot induction lateral buds of Gudene and Belete were cultured on MS basal medium that contained 30 g/l sucrose, 6 g/l agar, ...
Abstract: Papaya (C. papaya) is a medicinal plant due to its specific enzymes and bioactive compounds. Besides its nutritional properties, leaves and seeds are the most useful part among all used parts for the medicinal purpose. The present study is undertaken to investigate phytochemical screening, antioxidant and antimicrobial activities of aqueous and methanol extracts of papaya leaf and seed. The qualitative screening of phytochemicals was conducted using water and methanol as solvents. ...
Abstract: The emergence of increased multidrug resistant bacteria has initiated development of new antimicrobial agents. Essential oils from aromatic plants and herbal extracts have attracted scientific interest due to their potential use as antimicrobial and/or antioxidant compounds in foods.The present study was aimed to examine physicochemical properties and biological activities of essential oils extracted from sweet basil leaves and infloresence Evaluation of the Physicochemical propert...
Abstract: Plectranthus amboinicus is knowns us traditional plant medicine in dif erent rural and urban community. However, production and usage of this traditional medicines require a scientific techniques and supports for the appropriate development of antibacterial drugs. The current study was intended to investigate phytochemical screening and antibacterial activities of Plectranthus amboinicus crude extracts, against pathogenic bacteria using the disc dif usion method. The minimum inhibi...
Abstract: Lead is a heavy metal that is bio accumulative and non-biodegradable that poses a threat to our health when it exists in excess in our bloodstream. It has found its way into wastewater from mostly chemical industrial processes. In this article, we investigated the adsorption and hence removal of lead (II) ions from wastewater in order to purify it for re-use in industrial processes or for plant and animal use. We synthesized nano silica hollow spheres (NSHS) and used them as adsorb...
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....