Postgraduate Project Topics, Thesis and Dissertation
24981. Internal And External Agrochemical Loads Dynamics And Impacts On The Freshwater Ecosystem Of Lake Ziway Ethiopia
Excess agrochemicals input from agricultural activities and industrial effluent around Lake Zi-way catchment can pose a serious threat on the lake ecosystem. This study was undertaken to investigate the external and internal agrochemicals load, their dynamics, and impacts on Lake Ziway ecosystem...
24982. Phytochemical Investigation On The Leaves Of Dodonaea Viscosa Var. Angustifolia
The petroleum ether extract of the leaves of Dodonaea viscosa var. angustifoliarnafforded a diterpene 5-(2-(furan-3-yl)ethyl)-3,4,4a,5,6,7,8,8a-octahydro-8rnhydroxy-5,6,8a-trimethylnaphthalene-1-carboxylic acid (compound Dc-8B)rnwhereas the chloroform extract gave two compounds; a diterpene...
24983. Investigation Of Media For Removing Fluoride From The Ethiopian Rift Valley Ground Water
The chemical properties of fluorine, fluoride in the human environment; the fluoridernabsorption, distribution, and excretion in the human system are briefly reviewed. The beneficialrnand toxic effects of fluoride to human, plants, and animals; and several defluoridation methodsrnhave also been...
24984. Time And Space Dependence Of Ionic Composition Of The Kebena River In Addis Ababa
The Kebena River traverses Addis Ababa from north to south, The river starts upstreamrnfrom a scarcely populated area and goes to the south through the densely populated areas.rnThe difference in ionic compositions as one goes from upstream to down stream is then anrnindication of human impact on...
24985. Determination Of Levels Of Major Minor And Trace Elements In Ethiopian Ouzo Alcoholic Beverage
Alcoholic beverages are any fermented or distilled liquids such as wine, beer, whisky, ouzo,rngin, etc. Ouzo is one type of distilled alcoholic beverage with alcoholic content of 40 to 43 %rnflavored by anethole extracted from anise, star anise or fennel plant. In this study thernconcentration of...
24986. Anaiysis Of Testicular Growth Factors By Quantitative Polymerase Chain Reaction
Expression of testicular Interleukin-l a was anaIysed both at the lavel of biological activernpeptide and its encoding mRNA, using a sensitive bioassay, Thymocyte proliferation assay, andrnPolymerase Chain Reaction. In order to analyse the relative change in the level of IL -1 a mRNArnexpression a...
24987. Chemical Investigations Of Heteronema Erecta And An Unidentified Sponge Prom The Red Sea
Heteronemin, a pentacyclic sesterterpene has beenrncharacterized from the chloroform extract of an unidentifiedrnsponge sample collected from Massawa, Red Sea. The structurernwas established by 1H nmr, 13C nmr, and mass spectralrninterpretation.rnAnother CZ9 compound characterized as...
24988. Synthesis And Properties Of Some Sulfonamide Group Containing Thiourea Derivatives
In this work five N-arenesulphonyl-benzimidoyl-N’- thiourea derivatives werernsynthesized from intermediate of N-arenesulphonyl-benzimidoyl- rodanide (3) byrnreacting with different bascity of amines. Out of these derivatives compound 4,5 and 6rnwere synthesized by reacting rodanide (3) with...
24989. Templates Synthesis And Characterization Of Ni(ii) Complex Derived From 4phenoxy 26 Dichlorostriazin And 24dinitro Phenylhydrazine
New Ni(II) complex was synthesized from 4-phenoxy-2,6-dichloro-straizinernand 2,4-dinitrophenylhydrazine in the presence of hydratedrnmetal salt, Nicl2.6H2O in 1,4-dioxane-methanol medium. Before thernsynthesis of the complex, 4-phenoxy-2,6-dichloro-s-traizine wasrnprepared according to the...
24990. Levels Of Essential And Non-essential Metals In Commercially Available Ethiopian Black Teas
Essential (K, Ca, Mg, Mn, Fe, Zn, Cu and Co) and non-essential (Cd and Pb) metal contents of commercially available three brands of Ethiopian black tea (Wush Wush, Gumero, and Black Lion) and their infusions were analyzed by flame atomic absorption spectrometry (FAAS). In black tea leaves K was...
24991. Levels Of Essential And Non-essential Elements In Some Ethiopian Wines
The concentrations of thirteen metals (K, Na, Ca, Mg, Fe, Zn, Mn, Pb, Co, Ni, Cd, Cu and Cr) were determined in four brands of Ethiopian wines by flame atomic absorption spectrophotometry (FAAS) after digesting the wine samples with HNO3-H2O2 mixture. Among the major metals potassium (694 –...
24992. Synthesis And Study Of Quinalizarin Complexes With
The complexation of 1,2,5,8-tetrahydroxyanthraquinonern(quinalizarin) with some trivalent lanthanide ions: Sm(III),rnTb(III), Ce(III), and La(III) has been studiedrnspectrophotometrically and potentiometrically. The methods ofrncontinuous variation and mole ratio indicate the metal to ligandrnratio...
24993. Bis(trimethylenediamine) Cobait (iii) Mediated Hydrolysis Of Tripolyphosphate And Trimetaphosphate Mechanistic Considerations
The hydrolysis of tripolyphosphate ( pppi ) and trimetaphosphatern(mpppi ) at 10'3 M concentration byrn[tn 2Co(OH)(0H2 )]^, (tn = trimethylenediamine), usingrnEu2 f /H+ quenching was investigated. The europium quenchingrnwas adopted since other methods interfere with phosphaternanalysis. The...
24994. Jhetstudy Of Inborn Errors Of Amino Acid Metabolism In Mentally Retarded Subjects In Ethiopia
Inborn errors of amino acid metabolism are directly related to the absence of an enzymerninvolved in the metabolism of one or more amino acids, so that those amino acids increaserngreatly in plasma concentration and urinary excretion rates. Most of these inborn errors ofrnamino acid metabolism are...
24995. Electrochemical Synthesis And Characterization Of A Schiff Base Ligand And Schiff Base-nickel Complex
The electropolymerizations of the Schiff base ligand and the Ni-Schiff base complex were carried out in aqueous H2SO4 solution. The film coated glassy carbon electrode showed an electrochemical response. The factors that affect the electroactivity of the film, such as number of cycles used for the...
24996. Development Of New Analytical Methods For The Determination Of Caffeine Content In Aqueous Solution Of Green Coffee Beans
In the present work direct determination of caffeine in aqueous solution of green coffee bean was performed by using FT-IR-ATR and fluorescence spectrophotometers. In all the experiments water which is environmentally friendly and easily available everywhere was used for the extraction of caffeine...
24997. Phytochemical Investigation On The Root Of Rumex Abyssinicus
The n-hexane: ethylacetate (7:3) extract of Rumex abyssinicus afforded two knownrnanthraquinone, chrysophanol and Emodin. The root of rumex abyssinicus is traditionallyrnused for the treatment of sexually transmitted disease such as gonorrhea, Lung-TB andrnleporsy. Structural determination was...
24998. Hexafluorotantalate(v)-selective Coated Graphite Electrode Based On Malachite Green
An attempt was made to develop hexafluorotantalate(V)-selective coated graphiternelectrodes based on Malachite Green, Crystal Violet, and Ethyl Violet using fchloronaphthalene,rntri-n-bUI)'1 phosphate, and dimethylphthalate as plasticizers. Thernelectrode prepared by coating Malachite...
24999. Blood Level Determin A T Ions And Pharmacokinetic Stud Ies Of Anticonvulsants I N Ethiopian Epileptics
A gas chromatographic method was employed to monitorrnplasma levels of phenytoin and phenobarbital in 101 Ethiopianrnepileptic patients who were on chronic drug treatment andrnkinetics and plasma level-response relationship was studied.rn40% of the patients were on single drug treatment while...
25000. Determination Of Some Major And Trace Metals Levels In Korarima (aframomum Corrorima) Cultivated In The Southern And Southwestern Ethiopia
In this study, the concentration levels of major (Ca and Mg), trace (Fe, Zn, Cu,rnCo, Cr, Mn, and Ni), and toxic (Cd and Pb) metals were determined in korarimarn(Aframomum corrorima) samples collected from southern and southwesternrnEthiopia. The results were compared with the metal levels in the...
PREV PAGE 1248 1249 [1250] 1251 1252 NEXT PAGE
Page 1250 of 1327
Be the First to Share On Social
