"NATURAL PRESERVATIVES" Anthony C. Dweck Research Director‚ Peter Black Medicare Ltd.‚ White Horse Business Park‚ Aintree Avenue‚ Trowbridge‚ Wiltshire‚ UK. BA14 0XB SUMMARY This paper looks at the theoretical development of a natural preservative system using the author’s data base on medicinal plants as a source of references. The legal aspects of this concept are considered. The traditional methods of preservation‚ many taken from the food industry are summarised. The use of alcohol‚ glycerine
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Chem-127 – Impact of Chemistry – H. D. Roth Chapter 10: Drugs‚ Manipulating Molecules Everyday drugs – are we dependent? Prescription drugs – are we dependent? How harmful are illicit drugs? Are “natural” herbal remedies safer than synthetic ones? How are effective drugs designed? HDR-F-2012 Prontosil – the first antibiotic Prontosil‚ an effective antibacterial agent‚ belongs to the class of azo dyes‚ which were the first commercially produced chemicals; they effectively dyed wool
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* Strong Bases * LiOH * NaOH * KOH * Ca(OH)2 Slaked lime * Sr(OH)2 * Ba(OH)2 * Weak bases… everything else with an OH- * Amines * Methylamine- CH3 * Dimethylamine-(CH3)2NH *
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Rules for aromaticity 1. A cyclic planer structure and each atom must have a P orbital so that the electron cloud is not intterupted 2. It must contain an odd number of electron pairs ▪ i.e. the number of electrons must be 4n+2 where n=0‚1‚2‚3‚4……… ▪ so the number of electrons is 2‚6‚10‚14‚18……. ▪ this rule is called the Hückel’s Rule • monocyclic hydrocarbons with alternating single and double bonds are called annulenes • annulenes are named as [n]-annulene
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A TECHNICAL REPORT ON PHASE CHANGE MATERIALS & SOLAR WATER HEATING USING PHASE CHANGE MATERIALS INDEX 1. Introduction 2. Types of Phase Change Materials 3. Selection criteria 4. Principle of solar water heater with phase change materials 5. Heat transfer analysis between water and PCM’s 6. Results 7. Conclusion CHAPTER – 1 INTRODUCTION PHASE CHANGE MATERIALS: The materials which undergo either boiling or condensing by absorbing heat from a medium or liberating
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1/IITJEE - 2014 [CHEMISTRY] 1.(D) 2.(D) 3.(D) C 2 C3 bond is of the type sp 2 sp3 . 1-butyne is terminal alkyne. It will give ppt with ammoniacal Cu2Cl2 solution. CH3 NH 2 CHCl3 3KOH CH 3 NC 3KCl 3H2 O Carbylamine test 4.(C) OH | Tert. Pentyl bromide CH3 C CH CH3 CH3 C CH 2 CH3 E2 | | CH3 CH3 KCN (alc.) H / H2 O 5.(C) 6.(B) Cu+2 ions will get deposited and Zn+2 ions come into the solution but SO 2 will remain the same. 4 Tf iK f m 10 3
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or supply electrons will increase the basicity of amines while groups that decrease the electron density around the nitrogen decrease the basicity of the molecule. For alkyl halides in the gas phase‚ the order of base strength is given below: (CH3)3 N > (CH3)2NH > CH3NH2 > NH3 most least basic basic However‚
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of polyethene that are commonly found in households include‚ milk bottles‚ bins and microwave wraps. PVC and polystyrene: While ethene by itself is not particularly useful‚ it can be used to produce chemicals such as vinyl chloride (CH2=CHCl) and styrene (CH2=CH(C6H5)) which in turn can undergo polymerization to produce polyvinyl chloride (PVC) and polystyrene respectively. Traditional materials like rubber‚ steel‚ ceramics and glass are often replaced with PVC as it is a very versatile material
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the empirical formula for the compound is CH2.The empirical formula mass of this compound is: 12.0 + (2 x 1.0) = 14.0 g/molIf we know the molecular mass of the compound is 28.0 g/mol then we can find the molecular formula for the compound. MM = n x empirical formula mass 28.0 = n x 14.0 n = 2 So the molecular formula for the compound is 2 x empirical formula‚ ie‚ 2 x (CH2) which is C2H4There are many compounds that can have the empirical formula CH2. These include: * C2H4 (ethene or ethylene)
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PART- A : PHYSICS 1. A uniform cylinder of length L and mass M having cross - sectional area A is suspended‚ with its length vertical‚ from a fixed point by a massless spring‚ such that it is half submerged in a liquid of density σ at equilibrium position. The extension x0 of the spring when it is in equilibrium is : (1) Mg k (2) Mg LA 1 kM σ ⎛⎞ − ⎜⎟ ⎝⎠ (3) Mg LA 1 k 2M σ ⎛⎞ − ⎜⎟ ⎝⎠ (4) Mg LA 1 kM σ ⎛⎞ + ⎜⎟ ⎝⎠ (Here‚ k is spring constant) 1. (3) 0 LA Kx g mg 2 ⎛⎞ + σ = ⎜⎟ ⎝⎠ ∴ x0 =
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