effectively as low levels of DEET (N‚N-Diethyl-meta-toluamide) (7 percent to 15 percent concentrations) by masking the body’s natural odors. Look for a 30 percent to 40 percent concentration for maximum effectiveness. The most ancient natural remedy isn’t on the EPA’s list‚ but some Asian and African cultures swear by neem as an effective bug repellent‚ and some studies support that‚ though a higher concentration is needed to match the effectiveness of DEET (N‚N-Diethyl-meta-toluamide) or other repellents
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sample perfumes where imposter and which were real‚ components present in each perfume were analysed using gas chromatography and compared to the known real perfume sample. The components identified for comparison included vanillin‚ 3-penten-2-one‚ diethyl phthalate and cyclopentanaecetic acid. The relative concentration of each of the components in the samples was calculated for comparison. In the control sample‚ the relative concentration of each of these components were calculated using the
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Chemistry 11 Final Examination Review - Answers Part A - True or False. Indicate whether each of the following statements is true or false. Correct the false statements. F 1. The mass of an electron is equal to the mass of a proton. The mass of an electron is less than the mass of a proton. T 2. The mass of a proton is approximately equal to the mass of a neutron. T 3. The atomic number represents the number of protons in a nucleus. T 4. The proton has a mass of approximately
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Though cis-platin is highly effective‚ its counterpart trans-platin is counterintuitively not (7). Trans-platin is highly reactive with the environments that lead to reaching the DNA‚ and this reactivity results in the totality of the administered compound becoming deactivated prior to reacting with the DNA (9). Also the DNA lesion caused by cis-platin on the 1‚2 intrastrand crosslinks between adjacent purines is an act that trans-platin cannot do when looking from a stereochemical perspective (9)
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X-CH2-Y as the carbanion source‚ where X and Y are the electron withdrawing groups such as –CN‚-COOR‚-COR‚ NO2‚ etc. These groups are capable of stabilizing an adjacent carbanion by resonance. So in this experiment‚ the Knoevenagel Condensation of diethyl malonate with aromatic aldehyde salicylaldehyde involves an initial aldol-type addition followed by a spontaneous dehydration. The final step forms a lactone ring‚ generating the heterocyclic ring system known as Coumarin. One of the best known synthetic
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feed consumed). The animals were fasted overnight before scheduled clinical pathology sample collections‚ but had access to water ad libitum. At the end of the experimental period (17 weeks) the animals were anesthesized after a short exposure to diethyl ether. Incisions were made into the abdomen and blood samples were collected from the thorasic aorta. Blood samples for haematology analysis‚ were placed in micro-collection tubes containing potassium EDTA (Sarstedt‚ Inc.‚ Numbrecht‚ Germany). Blood
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Determination of Gatifloxacin and Ornidazole in Tablet Dosage Forms by High-Performance Thin-Layer Chromatography 43 A simple and sensitive high-performance thin-layer chromatography method has been developed for the quantitative estimation of gatifloxacin and ornidazole in its combined dosage forms. Gatifloxacin and ornidazole were chromatographed on silica Gel 60 F254 TLC plate using n-butanol: methanol: ammonia (6 M) (8:1:1.5 v/v) as the mobile phase and scanned at 302 nm using a Camag TLC Scanner
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VOL 20 NO 157 REGD NO DA 1589 Dhaka‚ Saturday‚ May 04‚2013 http://www.fe-bd.com/index.php?ref=MjBfMDVfMDRfMTNfMV8yN18xNjgzMjU= Of disasters‚ negligence and liability: Nimtoli tragedy revisited Published : Saturday‚ 04 May 2013 In case of fire in garment factories and accidents in unauthorized buildings‚ the regulators like the Fire Service or Rajuk come up with arguments that the factories or buildings do not have licence or permission‚ But they cannot avoid the ‘tortfeasor
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precipitate forms precipitate MgCl2 forms precipitate forms precipitate Discussion Lipids are a group of diverse fatty or oily substances that are grouped together because they are insoluble in water and are soluble in so-called fat solvents (diethyl ether‚ acetone‚ hexane and carbon tetrachloride). The elements present are carbon‚ hydrogen‚ and oxygen which are combined as esters of various fatty acids with the tri-hydroxy alcohol‚ glycerol. There are many different categories of lipids like triacyglycerols
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[Downloaded free from http://www.www.ijpsonline.com on Friday‚ July‚ 4 2008] www.ijpsonline.com Short Communications Spectrophotometric Method for Determination of Tablets Glucosamine in Tablets PRIYA GAONKAR‚ VINEETA KHANVILKAR‚ RAJANI SHETTIGAR AND CHHAYA GADGOLI* Saraswathi Vidya Bhavan’s College of Pharmacy‚ Sonarpada‚ Dombivli (East)-421 201‚ India. A rapid and sensitive method has been developed for the determination of glucosamine sulphate from tablets by UV-spectrophotometery
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