Browsing Chemistry by Issue Date

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Inflluence of humic and low molecular weight organic acids on arsenic mobility in contaminated soils Article

Dejene A. Tessema (1999)
Bedrock mineralogy versus soil total Arsenic, speciation and plant avialability Article

Dejene Ayele; Abera Mogessie; Kebede Hailu (2002)
Determination of levels of pb and cr in water sample and its Removal by adsorption onto activated carbon prepared From pine apple peel Thesis

Leta Shifera (2004-10)

Heavy metal contamination of water could occur anywhere at resources, course of distribution or consumption place. Precise knowledge on amount and type of water pollutants especially heavy metal are essential to protect ...
Freeze-drying of sol–gel encapsulated recombinant bioluminescent E. coli by using lyo-protectants Article

Dejene A. Tessema; Rachel Rosen; Rami Pedazu (2005-08)

Toxicity sensing by live microorganisms has attracted considerable attention during the last decade. These sensors exhibit a non-specific, relatively fast response to changes in water quality or to physiological stress ...
Student Centred Teaching and Learning Experience from the External World Article

Dejene Ayele; Kees Schippers (2007-03)
Evaluation of fixed oil from seeds of maesa lanceolata (myrsinaceae) for phytochemical constituents, physicochemical characteristicsand biological activity Thesis

Wubayehu Sewagegn (2007-10)

The present study reports the yield, physicochemical properties, phytochemical constituents and biological activities (insecticidal & antimicrobial) of M. lanceolata seed oil and compounds isolated from it. The oil was ...
Mobilization of Iron from Soil Recalcitrant Fractions by Using Mango (Mangifera Indica) Plant Leaf Extract Article

Dejenem, M.; Yemaneh, K; Dejene, A. Tessema (2009-09)

This study has been carried out to investigate the speciation of iron in the various, plant available and non-available, soil fractions and the efficiency of the Mango (Mangifera indica) plant leaf extract in mobilizing ...
Arsenic Distribution in Arsenic rich Austrian Soils Article

Dejene A. Tessema; Walter Kosmus (2010)

Arsenic rich soil was collected from Gasen, a village in south eastern Austria which lies along the Strassegg electrum-arsenopyrite vein-type mineralization, and a portion of this soil was flooded in a small lysimeter. ...
Going beyond conventional osmotic dehydration for quality advantage and energy savings Article

Yetenayet, Bekele; Hosahalli, Ramaswamy (2010-11)

drying is a partial dehydration process, often considered more as a treatment, to give the product a quality improvement over the conventional drying process. The osmotic treatment involves soaking of a food in hypertonic ...
Kinetics and Mechanism of Oxidation of Glycolic Acid by Hexamethylenetetramine-Bromine in Glacial Acetic Acid Medium Article

Mengistu W Tinsay; Khalid Siraj (2011)

The kinetics of oxidation of glycolic acid by hexamethylenetetramine bromine (HABR) has been studied. The reaction follows second-order kinetics, first-order with respect to each reactant. Glycolic acid is oxidized to give ...
Survey on the usage of plastic bags, their disposal and adverse impacts on environment: A case study in Jimma City, Southwestern Ethiopia Article

Legesse Adane; Diriba Muleta (2011-05)

Plastic bag wastes pose serious environmental pollutions and health problems in humans and animals. The situation is worsened in economically disadvantaged countries like Ethiopia. The objective of this survey was to ...
Isolation and Characterization of Compounds from Roots of Moringa stenopetala, and Evaluation of their Antileishmanial Activities Thesis

Banchiwessen Bekele (2011-09)

The objective of this study was to isolate compounds from the roots of Moringa stenopetala, and to evaluate their antileishmanial activity based on previous research re sults which revealed that the root extracts of this ...
Phytoextraction of lead and chromium by leafy vegetables (lettuce, kale and swiss chard) Thesis

Mamu Haftu (2011-09)

Phytoextraction of metal from soil is a plant-based technique of removing metal pollutants from the soil. This research was carried out to assess the accumulation of Cr and Pb in leafy vegetables (lettuce, kale and Swiss ...
Relevance and safety of Chemistry laboratory experiments from students’ perspective: a case study at Jimma University, southwestern Ethiopia Article

Legesse Adane; Antehun Admas (2011-11)

The main objective of this study was to gather students’ opinion about the relevance and safety of Chemistry laboratory experiments. The study population of the study were undergraduate students majoring Chemistry, at Jimma ...
Electrode surface nanostructuring via nanoparticle electronucleation for signal enhancement in electrochemical genosensors Article

Tesfaye Refera; Olivier Y.F. Henry; Ciara K. Oˇ ıSullivan (2012)

Biosensor read out signals can be enhanced by carefully designing the transducer surfaces to achieve an optimal interaction between the recognition elements immobilised and the targeted analyte. This is particularly evident ...
Isolation and characterization of natural products from Helinus mystachnus (Rhamnaceae) Article

Getahun, Tadesse; Reneela, P.; Aman, Dekebo (2012)

In the present work phytochemical analysis of root extract of Helinus mystachinus was carried out. Root of the plant material was successively extracted with petroleum ether, chloroform, and methanol. Phytochemical screening ...
Evaluation of Antibacterial Activities of Compounds Isolated From Sida rhombifoliaLinn. (Malvaceae) Article

Sileshi Woldeyes; Legesse Adane; Yinebeb Tariku, etal (2012)

The main objective of this study was to isolate compounds from roots of Sida rhombifolia and subsequently evaluate their antibacterial activities. Crude gradient extracts were obtained from three solvents (petroleum ether, ...
Occupational lead exposure among automotive garage workers – a case study for Jimma town, Ethiopia Article

Yalemsew Adela; Argaw Ambelu; Dejene A Tessema (2012)

In Ethiopia, although there are numerous small-scale and medium industries which use lead-based raw materials that may pose health risks to workers, there are no workplace regulations for lead exposure. Moreover, there are ...
Assessment of Familiarity and Understanding of Chemical Hazard Warning Signs among University Students Majoring Chemistry and Biology: A Case Study at Jimma University, Southwestern Ethiopia Article

Legesse Adane; Asmamaw Abeje (2012)

The objective of this study was to assess students’ familiarity and comprehension of chemical hazard warning signs at the Departments of Chemistry and Biology, Jimma University. Data were collected from randomly selected ...
Assessment of the Adsorption Capacities of Fired Clay Soils From Jimma (Ethiopia) For the Removal of Cr (VI) from Aqueous Solution Article

Dessalew D. Alemayehu; Sanjeev K. Singh; Dejene A. Tessema (2012)

The abilities of three thermally treated clay soils, S1, S2 and S3, which differed in textural compositions, to remove Cr (VI) from aqueous solutions were evaluated. Removal efficiencies of the clays were found to be ...

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