The Anthelmintic Property of Methanolic and Ethanolic extract of the Kulitis leaves (Amaranthus viridis) Chapter 1 Introduction The World Health Organization estimates that a staggering two billion people harbor parasitic worm infections. Parasitic worm also infect livestock and crops‚ affecting food production with a resultant economic impact. Despite this pevelance of parasitic infections‚ the research o the Anthelmintic drug is sparse. According to the WHO‚ only a
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Here is cbse 2007 question paper of science: CBSE X SCIENCE AND TECHNOLOGY (Theory) 2007 (OUTSIDE DELHI) Time allowed: 2 hours 15 mins; Maximum Marks: 100 General Instructions: | 1) | The question paper comprises of two sections A and B. You are to attempt both sections. | 2) | You are advised to attempt all the questions of Section A and Section B separately. | 3) | All questions are compulsory. | 4) | There is no overall choice. However‚ internal choice has been provided in some questions
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Extraction (Ch # 07) Faraz Gohar Mr. Wayne Xie Chem 201 10/02/2012 Objectives : 1)To purify samples of organic compounds that are solids at room temperature. 2)To dissociate the impure sample in the minimum amount of an appropriate hot solvent Chemical Index : Naphthalene; mp 82 *C 1‚4-Dichlorobenzene; mp 56 *C 4-Chloroaniline; mp 68 - 71 *C; pKb 4.15 Ethyl 4-Aminobenzoate; mp 90 *C; pKb 4.92 Procedure :
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containing a single reference compound. The composition of the unknown mixture and two single unknowns were determined by spotting the reference compounds and the unknown compounds on two TLC plates. Placed them in a developing chamber that contained 0.5% acetic acid in ethyl acetate solvent and observed the TLC plates under UV light after the TLC plates were taken out of the developing chamber. The known reference compounds portrayed spots and calculated Rf values that the unknown compounds matched to. This
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Asymmetric Epoxidation of Dihydronaphthalene with a Synthesized Jacobsen’s Catalyst Justin Lindsey 12/08/96 Chem 250 GG Professor Tim Hoyt TA: Andrea Egans Abstract. 1‚2 diaminocyclohexane was reacted with L-(+)-tartaric acid to yield (R‚R)-1‚2-diaminocyclohexane mono-(+)-tartrate salt. The tartrate salt was then reacted with potassium carbonate and 3‚5-di-tert-butylsalicylaldehyde to yield (R‚R)-N‚N’-Bis(3‚5-di-tert-butylsalicylidene)-1‚2-cyclohexanediamine‚ which was then reacted with Mn(OAc)2*4H2O
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Ka‚ Acid Dissociation Constant and Kb‚ Base Dissociation Constant (Lesson Recap) Ka‚ Acid Dissociation Constant Ka- is the Keq for the dissociation for a weak acid. e.g Acetic Acid‚ when dissolved in H2O CH3COOH (aq) + H2O (l) (ACID) (BASE) CH3COO (aq) + H3O(l) (CONJ BASE) (CONJ ACID) CH3COOH (aq) + H2O(l) ↔ CH3COO (aq) + H3O(l) *ONLY weak acid and back can be reversible Equation for Ka : Keq= [CH3COO(aq)] [H3O(l)][CH3COOH(aq)] [H2O(l)] Keq x [H2O
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Introduction Esters derive from the reaction between a carboxylic acid and an alcohol (Figure 1). Figure 1. The General Reaction Equation of Ester Formation From A Carboxylic Acid & An Alcohol. Carboxylic acids contain the functional group –COOH whereas in ester’s the hydrogen is replaced with an R denoting any alkyl or aryl group; -RCOOR’. Esters with low-molecular weights are commonly used as components in the flavor’s and odors of many fruits & fragrances’ as well as to enhance foods & beverages
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maximum methanol content of 0.10%‚ and a maximum water content of 0.05%. In many applications‚ Eastman methyl acetate can be an effective replacement for acetone and other fast-evaporating solvents. Strength—assay Methanol Water Acidity as acetic acid Color‚ PCS Some common cleaning applications include: • Universal cleaner • Low-VOC and environmental cleaners • Aerosol carburetor cleaners • Paint gun cleaners • Cleaners for printing inks Table 1 Sales specifications
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Swimmers ear: Infection of the skin covering the outer ear canal that leads in to the ear drum‚ usually due to bacteria such as streptococcus‚ staphylococcus‚ or pseudomonas. Swimmer’s Ear Symptoms • The most common symptom of swimmer’s ear is pain. Pain gradually begins over a day or two. The pain almost always involves only one ear. The pain is especially intense when the ear is touched or pulled. • The ear canal may itch. • The outer ear may be red‚ and in severe cases the ear
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respectively)‚ centrifuged at 500xg for 5min. The pellets were resuspended in hypotonic solutions (0.075M KCl or 1.1% tri-sodium citrate respectively) and incubated at 37°C for 20min prior to fixation with the Carnoy’s fixative (methanol : glacial acetic acid: 3:1‚ 3X). The fixed cells were spread over cold slides; air dried‚ and then stained with 7% Giemsa stain in phosphate buffer (pH6.8). A hundred well spread metaphases per animal were analyzed for chromosome aberrations in bone-marrow cells
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