28/11/13 EVALUATION OF THE EFFECT OF SODIUM CHLORIDE ON ONION EPIDERMAL CELLS INRODUCTION A living plant cell will shrinks or swells depending on the solute concentration of the cell in relation to the solute concentration of the fluid surrounding the cell (1). It follows that water will move from a region of high water concentration to a region of low water concentration therefore‚ if a cell is placed in a hypertonic solution water will move from the cell into the solution until the cell shrinks(1)
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Extraction of DNA Science Fair Project 2013-2014 Produced by Nadia Walker Due Date: Monday January 20th 2014 Presented to Mr. Freimann Date Submitted: Monday January 20th 2014 Table of Contents Introduction page 1 Hypothesis and materials
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DNA and Crime Deoxyribonucleic Acid - the fingerprint of life also know as DNA was first mapped out in the early 1950’s by British biophysicist‚ Francis Harry Compton Crick and American biochemist James Dewey Watson. They determined the three-dimensional structure of DNA‚ the substance that passes on the genetic characteristics from one generation to the next. DNA is found in the chromosomes in the nucleus of a cell. "Every family line has it’s own unique pattern of restriction-enzyme DNA
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DNA FINGERPRINTING Background Reading - Nelson Biology and Campbell Biology Purpose - To understand the basics of DNA fingerprinting used in the Canadian courts for crime convictions and paternity suits. Introduction The process of DNA fingerprinting was developed by Professor Alec Jeffreys at Leicester University in 1984 as a form of genetic analysis. It was first used in the law courts of England in 1987 to convict a man in a rape case. It has now been used successfully in many crime and paternity
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DNA profiling is a method of identifying an individual by unique characteristics of their DNA. A specific DNA pattern‚ called a profile‚ is obtained from an individual or a sample of tissue. This allows the comparison of the base sequence of two or more DNA samples to determine whether they are related. DNA profiling has many uses‚ in prevention of economic fraud‚ dietetic work‚ and classifying species‚ identifying bodies‚ forensic science‚ screening for disease‚ and investigating paternity.
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Osmosis/Plasmolysis Lab Name: Problem: How do solutions of various salt concentrations influence osmosis in relation to an onion cell? Materials: (per student group): red onion epidermis forceps‚ dropper distilled water NaCl solution paper towels microscope slide cover slip Procedure 1. Make a wet mount of the red onion epidermis. 2. Examine under low power. When you have a clear view of several cells‚ switch to high power. Make a labeled drawing
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Isolation of Bacteria in our Physical Environment Introduction: The purpose of the lab is to apply what has been learned so far in Microbiology‚ and use it to collect and examine microbial species from the physical environment. The physical environment around the lab will be utilized to find out the variety of different microbial species growing in and around the lab. This investigation will help in preparation for the individual projects that will be done at the end of the semester. Materials
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Experiment #9 Isolation and Isomerization of Lycopene from Tomato Paste Goal / Purpose To extract the carotenoid pigments from canned tomato paste and separate them by column chromatography to obtain a solution that contains lycopene. Then record the ultraviolet-visible spectrum of this solution and analyze it for evidence of isomerization. Calculation List of Materials 4.0g tomato paste screw cap vial Chromatography column 25ml buret 50ml flask ring stamd and clamp 50% mixture
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Isolation of Trimyristin from Nutmeg and preparation of Myristic Acid from Trimyristin by Hydrolysis Introduction Over 40% of medicinal chemicals in the world were developed from isolation of the natural source. These sources were from fungi‚ plants‚ bacteria‚ animals‚ etc. The techniques used to isolate and purify has been by extraction‚ distillation‚ recrystallization‚ and chromatography. In this experiment we will be trying to obtain a pure organic compound from a natural source. Because this
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light green tissue. Spores appear as white velvety growth at the edge of the lesions‚ primarily at the underside of the leaf. It is this white growth that distinguishes Phytophthora leaf blight from several other foliar diseases. Often large amounts of sporangiospores are produced as 1-4 sporangiophores extend from the stomata at the underside of the leaf and produce large numbers of sporangiospores which can either be airborne under relatively dry conditions or differentiate into numerous zoospores under
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