Extraction and Sublimation of Caffeine from Tea Leaves By: Ashley Barnes CH 236 – P8 Experiment 4 & 4.5 Due: 10/15/2014 Table 1. Table of Reagents Discussion The extraction yield refers to the percent of caffeine in the tea leaves at start of the extraction experiment. Tea leaves had 0.55 grams of mass per eight ounce serving. The weight of the extracted crude caffeine was 0.264 grams. Therefore‚ the extraction yield was 48%. This means that we pulled out almost half of the caffeine
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Jimmy Wales and Michael Snow. | [Hide] [Help us with translations!] | DNA vaccine What is antisense technology? Antisense refers to opposing the normal order (“sense”) of the code in DNA. The DNA (deoxyribonucleic acid) in genes directs cells to assemble the proteins which comprise living creatures. The order of bases in DNA corresponds to the ordering of amino acids to form the proteins. To produce protein‚ the DNA of the genes in cells is first transcribed into a very similar molecule called
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Discovery of dns Discovery of DNA By: Leslie A. Pray‚ Ph.D. © 2008 Nature Education Citation: Pray‚ L. (2008) Discovery of DNA structure and function: Watson and Crick. Nature Education 1(1) In the attached article‚ Leslie Pray discusses how the discovery of DNA came about and what it took to develop and finally formulate the different forms of what we now call DNA. DNA wasn’t just discovered by 1 or 2 scientists but rather a group of scientist over many different years. She starts off by
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Associate Program Material DNA Worksheet Answer the following in at least 100 words: 1. Describe the structure of DNA. DNA is typically has two strands running in opposite direction and is usually referred to as a double helix. Each on the individual strands consists of a backbone that is formed by sugar molecules linked together in groups. Each individual sugar molecule is covalently linked to one of the following possible bases: Adenine‚ Guanine‚ Cytosine and Thymine. These bases
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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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DNA Worksheet Trisha McCabe SCI/230 May 8th 20132 Chandreyi Basu‚ PhD Associate Program Material DNA Worksheet Answer the following in at least 100 words: 1. Describe the structure of DNA. DNA made up of units called nucleotides‚ nucleotides are made up of three molecules components‚ a nitrogen base‚ a sugar‚ and a phosphate (Simon‚ Reece‚ Dickey‚ 2010). The nucleotides are joined together by bonds between the sugar of one nucleotide and the phosphate of the next producing
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DNA helicase -separates strands of nuclei acid‚ breaks H bond between nitrogenous bases.‚ works at the replication fork -DNA PRIMASE- lays RNA primer ‚ acts as new strand‚ can only add nucleotides to a free3’ end ‚ lays nucleotide with a 5’ orientation -DNA POLYMERASE 3- adds nucleotides using base pair rules lcreating 2 new daughter strands‚ only adds to a free 3’end and lays down nucleotide with 5’ orientation. Pol3 continuously synthesizes new daughter cell(leading strand) same direction as
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The upper most strand is the (coding strand) DNA base sequence (triplet) of the gene codes for synthesis of a particular polypeptide chain. The second strand is the mRNA base sequence (template strand used for copying) codon of the transcribed mRNA. The process for going from the upper stand to the second strand is called Transcription and involves an enzyme called polymerase. The polymerase attaches to the promoter region (start codon) and reads the nucleotide base sequence until it gets to a termination
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2.3.3 Feature Extraction Feature extraction deals with the extraction of the distinctive features out of face images so that those face images can be differentiated among each other. There are several algorithms available for extracting features out of a face image. The most common is the use of mathematical formulas that generate a mathematical representation of a face image that is termed as a template‚ these templates are “the refined‚ processed and stored representation of the distinguishing
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the quantification of albumin and casein were performed and analyzed after extraction of the said proteins from their respective sources. Isolation of proteins was initiated by the breakage of the cell wall / membranes in three different ways. Homogenization of invertase‚ albumin and casein were achieved via grinding process‚ addition of 1M acetic acid and acidification by 0.1M hydrochloric acid correspondingly. Extraction of invertase and casein involved precipitation through the utilization of 95%
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