acidification of salicylic acid and acetic anhydride. The objective was to convert a specific amount of salicylic acid into the same amount of aspirin that was high in purity. Furthermore‚ the other objectives were to enable students to conduct the synthesis of aspirin‚ reinforce skills or recrystallisation and the technique of melting point determination. The amount of each compound should be the same because there is a 1:1 ratio between them. The purity of the synthesized aspirin was measured by determining
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Animal Communication Animal communication is any behavior on the part of one animal that has an effect on the current or future behaviour of another animal. The study of animal communication‚ sometimes called Zoosemiotics (distinguishable from anthroposemiotics‚ the study of human communication) has played an important part in the methodology of ethology‚ sociobiology‚ and the study ofanimal cognition. Animal communication‚ and indeed the understanding of the animal world in general‚ is a rapidly
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Animal testing has been technique that is used for a number of years. It has been used as a way to test things ranging from medicine and vaccines to cosmetics and personal care products. Animal testing has also been used to find cures for certain diseases like Amyotrophic lateral sclerosis or ALS. This testing technique occurs in many parts of the world from the United States of America to China‚ but has also been banned in a number of places like Europe. Animal testing is harmful to the animals
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Animal experimentation has dedicated to life science by helping cure people and making new medicine for many diseases although it has harmful side effects. Dr. Corina Gericke states that animal research is not a scientific method anymore‚ so it should not be allowed. The medicines tested for safety via animal experimentation brings out several terminal maladies for people‚ which shows people and animals have fairly different biochemical (Corina). However‚ the University of Oxford states that there
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Sarah Khan Bivins-5th April 20th‚ 2013 Protein Synthesis Every day‚ you take in an abundance of different biomolecules; one of them being proteins. Have you ever wondered how proteins are made? They don’t just grow from a tree or fall from the sky‚ they are made through a process called protein synthesis. Protein synthesis is broken up in two two steps: transcription and translation. Transcription starts inside the nucleus when the DNA is unzipped by helicase. Following that‚ the mRNA nucleotides
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Animal Experimentation: The Good‚ The Bad‚ and the Ugly of Animal testing Animal testing is a touchy subject to many people. The idea of using animals for the gain of the human race is seen as immoral by some people‚ while on the other hand‚ some people see animal experimentation as an impactful part of the scientific field. Through animal testing there has been many discoveries that have highly influenced the medical field. In regards to animal testing‚ is it beneficial or is it an unnecessary
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Synthesis of Aspirin Name: Xuanyi Li Teaching assistant: Deirdre Zwilling November 15‚ 2009 Purpose: To synthesize aspirin‚ a common analgesic drug‚ via nucleophilic acid-catalyzed substitution reaction of salicyclic acid with acetic anhydride. The whole reaction is catalyzed by phosphoric acid. (The experiment involved three parts: The synthesis of aspirin‚ the isolation and purification of aspirin‚ and the estimation of the purity of the final product.) [pic] Procedure[1]: A mixture
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Synthesis of Aspirin Learning Goals 1. To synthesize aspirin from salicylic acid and acetic anhydride. 2. To purify the crude product by Recrystallization. Introduction Most drugs are chemical compounds which are described as "organic compounds" because they are comprised primarily of the elements carbon‚ hydrogen and oxygen. The present experiment will be the synthesis of a familiar organic compound called aspirin. The common chemical name is acetylsalicylic acid. Aspirin‚ the
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Jeana Greaves Chem3301-112 June 19‚ 2013 Synthesis of Aspirin from Methyl Salicylate Introduction The synthesis of Aspirin (Acetyl Salicyclic Acid) began with methyl salicylate and sodium hydroxide as the reagent. The polar oxygen accepts the electrons from now positively charged hydrogen. The positively charged sodium disassociates leaving the hydroxide ion with a negative Scheme 1 shows the mechanisms that were demonstrated during the synthesis of Aspirin. charge that attracts to the positively
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U‚ and C for the nucleotides guanine‚ adenine‚ uracil and cytosine) that directs synthesis of specific proteins‚ while many viruses encode their genetic information using an RNA genome. Some RNA molecules play an active role within cells by catalyzing biological reactions‚ controlling gene expression‚ or sensing and communicating responses to cellular signals. One of these active processes is protein synthesis‚ a universal function whereby mRNA molecules direct the assembly of proteins on ribosomes
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