Introduction Metallic yarns or threads‚ in general‚ have been known for more than 3000 years. Gold and silver were hammered into extremely thin sheets‚ then cut into ribbons and worked into fabrics. These were the first ‘man made’ fibres‚ which came thousands of years before nylon or rayon. The Persians made fabulous carpets with gold thread and the Indians‚ ornamental sarees with it. The metal threads were twisted‚ doubled or wrapped around some other thread such as cotton. With the advancement
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compound) for glucose and sodium acetate. (5 marks) C6H12O6 + 6O2 6CO2 + 6H2O The no. of mole of glucose = 1/(12x6 +12x 1+6x16)=5.56x10-3mole The ratio of glucose and oxygen is 1:6 The no. of mole of oxygen= 5.56x10-3 x 6 = 0.033mole Therefore‚ the theoretical oxygen demands for glucose =0.033 x (16x2) =1.067 g oxygen/g glucose CH3COONa + 2O2 2CO2 + H2O The no. of mole of sodium acetate =1/(12x2 + 16x2 + 3x1 +23)=0.012mole The ratio of sodium acetate and oxygen is 1:2 The no.
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simultaneous estimation of of ellagic acid‚ chlorogenic acid‚ gallic acid and quercetin in the leaf extract of Terminalia tomentosa and its Formulation. The stationary phase used was precoated silica gel 60F254.The mobile phase used was a mixture of Butyl acetate: Formic Acid: Distilled Water 14:5:5 (v/v). The detection of spots were carried out at 254 nm. This HPTLC method was validated statistically and recovery study was performed to confirm the accuracy of the method. It can be used for routine quality
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basic salt solutions relate Ka and Kb acid strength (binary acids) acid strength (oxyacids) Lewis acid Lewis base Chapter 17: Additional Aspects of Aqueous Equilibria common ion effect effect of buffer composition of buffer preparation of buffers Henderson-Hasselbach equation buffer capacity buffer range SA/SB titration curve WA/SB titration curve equivalence point pH at equivalence pt buffer region pH at midpoint solubility product constant insoluble Ksp slightly
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used to hold this extraction and 5 mL of ethyl acetate will be passed through SPE column‚ to obtain and remove the caffeine from the SPE column. A small one-armed Erlenmeyer flask containing 5 mL of ethyl acetate along with the compound caffeine‚ should be the result after using the SPE column
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years ago‚ people were already had been using perfume oils for their bodies for in small or big amounts dependent on their fashion whims. In early Egypt‚ Egyptians used perfumed balms for their of religious ceremonies and for pre - love making preparations. And other materials are also use in scenting the place like Myrrh‚ Frankincense and Other plants such as rose and peppermint. A synthetic perfume product is very expensive and it is very hard to find the ingredients. Perfume is made from about
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other words‚ we created the perfect eco-friendly bouncy ball. The materials we used to create this eco-friendly ball were polyvinyl alcohol (PVA) and polyvinyl acetate (PVAc) and we reacted them with sodium borate (borax). Polyvinyl acetate (PVA) is a water-soluble synthetic polymer. It has the idealized formula [CH2CH]n. Polyvinyl acetate (PVA) is a synthetic resin polymer. The chemical formula of this component is (C4H6O2)n. The last component is sodium borate (Borax). It is an important boron
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Rayon is a manufactured regenerated cellulose fiber. Because it is produced from naturally occurring polymers‚ it is neither a truly synthetic fiber nor a natural fiber; it is a semi-synthetic[1] fiber. Rayon Fiber Characteristics o Highly absorbent o Soft and comfortable o Easy to dye o Drapes well Some Major Rayon Fiber Uses • Apparel: Accessories‚ blouses‚ dresses‚ jackets‚ lingerie‚ linings‚ millinery‚ slacks‚ sportshirts‚ sportswear‚ suits
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Pituitary Gland Effects: Extracts of the posterior pituitary lobe exhibit the following effects:- 1. A pressor effect‚ owing to arteriolar and capillary vasoconstriction 2. Direct stimulation of smooth muscle‚ seen in the intact animal or in preparations of isolated muscles 3. An antidiuretic action‚ effected by increasing the tubular and collecting duct resorption of water in the kidney. OXYTOCIN (hypophamine) Physiological Function Oxytocin is the uterine- stimulating fraction‚ and
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(25:24:1)‚ Absolute ethanol‚ 70% ethanol‚ Sterile distilled water Apparatus: Micropipettes‚ conical flask‚ measuring cylinder‚ beaker‚ gloves. THEORY: The procedure for genomic DNA preparation from a culture of bacterial cells (lacking plasmids) can be divided into four stages:- 1. A culture of bacteria is grown and then harvested. 2. The cells are broken open to release their contents. 3. This cell extract is treated to remove all
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