To Gram stain the given bacterial suspension and to differentiate between gram positive and gram negative organism. Visualization of microorganisms in the living state is very difficult‚ not just because they are minute‚ but because they are transparent and almost colorless when suspended in an aqueous medium. To study their properties and divide microorganisms into specific groups for diagnostic purposes‚ biological stains and staining procedures‚ in conjunction with light microscopy‚ have become
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Since the Grignard reagent can easily react with water‚ all glassware including the 25 ml round bottom flask‚ magnetic stir bar‚ 3 and 5 ml conical vial‚ 50 mL Erlenmeyer flask‚ claisen adapter‚ drying tube and 5 glass pasteur pipets were first added to a 250mL beaker and placed in the oven for 30 minutes. After the completion of the thirty minutes‚ 0.150 g of shiny magnesium turnings and a stir bar was first added to the round bottom flask and the claisen adapter along with the drying tube packed
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Purpose: To find out the densities and to find out the name of the unknown metals. (Based on the extensive and intensive properties) Check up the words mass‚ volume‚ density‚ extensive properties‚ and intensive properties. Where do the units for mass and volume) come from and what do they mean? What is the density of distilled water? What is Archimedes principle? Does temperature affect the density of a solid? Liquid? Gas? Materials: Safety glasses‚ 10‚ 25 or 50 mL graduated cylinders
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Lab Report Microbiology Introduction Bacteria can be found almost anywhere. For human life‚ some help us‚ some hurt us‚ and others are neutral. It is now known that good bacteria‚ or normal microflora‚ can reach 1014 microbial cells. This is far more than the 1013 cells that make up the human body (Tannock‚ 1995). The total number of bacteria on Earth is estimated to be around 4-6 x 1030 (Horner-Devine‚ 2004). It is important to know the extent of bacteria‚ how they live‚ and how they are
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disease causing pathogens. These guidelines developed from his work with purified cultures of anthrax that had been isolated from dead animals. Koch also proved that the same disease could be passed from one organism to another. Pasteur proved that microorganisms could be present in non-living matter. Bassi passed both Pasteur and Koch in the discovery that many diseases of both man and animal were caused by parasites. This was important in the formulation of the germ theory‚ to which both Pasteur and
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Experiment 21: Salmonella and food contamination Purpose /Objective Objective: To test salmonella in spinach sample over five lab periods. Food contamination of salmonella can cause serious illness. Only small numbers of salmonella need to be found for a food product to be considered contaminated. Tests used Pre-enrichment- lactose broth Selective enrichment broth- with Tetrathionate Brilliant Broth Selective Plating- Brilliant Green Agar Isolation of salmonella conformation- is preformed
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African Diaspora and the World After reading the short story “Diaspora” by Joanne Hyppolite‚ I got a vivid understanding of how diaspora can have an effect on one’s identity. Over the past month we have studied many theories and concepts concerning race‚ gender‚ and politics. There are three theories that capture the essence of Joanne Hyppolite’s worldview as a Haitian growing up in America: intersectionality‚ identity‚ and diaspora. Individuals oftentimes experience the theory of Intersectionality
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The natural environment is highly populated with microorganisms such as bacteria‚ fungi‚ protista and several others. Microorganisms are microscopic in size and vary shape. They are found in the air‚ in water‚ on land and on other organisms such as humans and pets. Many microorganisms grow at rapid speeds and can be harmful and cause diseases. Although microorganisms may cause harm‚ society benefits from microorganisms in many ways. Microorganisms are necessary for the production of antibiotics‚
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Introduction This lab is purposed to familiarize basic equipment and techniques used in the study of microorganisms. In addition‚ learn some basic techniques used in identifying prokaryotes and make and view microscope slides of some common prokaryotes. In this lab ‚ I worked two experiments ‚ the first one is cultivation bacteria "colony "‚ and When microorganisms are cultivated in the laboratory‚ a growth environment called a medium
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Antibiotic Sensitivity lab A. Define the term selectively toxic. Why is it an important feature of antimicrobial agents? Selective toxicity is the ability of a chemical or drug to kill a microorganism without harming its host. Selective toxicity is important to microbial agents because it enables these agents to inhibit or kill a microorganism by interacting with microbial functions or structures different from those of the host thereby showing little or no effect to the host. B. What
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