Holtz MICR 202L November 09‚ 2016 Exercise 15: Antimicrobials Purpose The purpose of exercise 15 was to determine the effects of different antimicrobials on both Gram-positive bacteria and Gram-negative bacteria. Procedure Overall‚ exercise 15 was broken down into two days of procedures. For the first part of the experiment‚ we divided three petri plates into three equally sized units on the plate and marked them with wax pencils in accordance
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Antibiotics research 1. Define the term antibiotics Antibiotics are a drug used to treat infections caused by bacteria and other microorganisms. Originally‚ an antibiotic was a substance produced by one microorganism that selectively inhibits the growth of another. Synthetic antibiotics‚ usually chemically related to natural antibiotics‚ have since been produced that accomplish comparable tasks 2. a) who was the first scientist to discover antibiotics Alexander Fleming (1928) b) Briefly
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2011/12/15 What a wonderful creature “Bacteria” is! Today‚ a lot of creatures live in where we live in. A lot of creatures live with ours. However our world face a lot of troubles. For example water depression‚ soil depression‚ lost of water‚ and so on. If we can look out saver for this ploblem‚ we be able to live in our world much better. Then‚ the number of “Bacteria” is much higher than any other creatures in our world. Because this creature can
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experiment that was done to demonstrate the effects of lysozyme on populations of Gram positive and Gram negative bacteria. Bacteria have a cell wall composed of peptidoglycan that gives the wall its strength. Gram negative bacteria have and extra component of lipopolysaccharide (LPS)‚ that is stabilized with magnesium ions‚ to their cell wall that further protects them. When Gram positive bacteria are treated with lysozyme‚ the lysozyme breaks down the peptidoglycan‚ allowing the cell to rupture if it is
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the growth of most bacteria‚ but allowing salt tolerant (Halophile ) staphylo cocci to grow allows staphylococc i to grow b/c they are salt tolerant only disease causing staphylococc i ferment the sugar mannitol‚ so non disease causing staphylococc i will grow but not change the color and dieses causing staphylococc i will grow and change the color of the media alphaleteat selects for hletics@ya the hoo.com identification (bacteria‚ of gram but negative
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unknown bacteria. Bacteria have three different shapes; cocci‚ bacilli‚ and spirilla. Since bacteria pretty much have the same reflective index as water‚ a bacteria cell must be dyed so that these shapes can be seen. Materials: Petri dish Dropper Cleansing solution Slides Bibulous paper Inoculation loop Crystal violet dye‚ Iodine Acetone Safranin Water from the sink Microscope Clothes pin Bunsen burner Methods: 1. Obtain your slide and draw two circles where your bacteria will
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The Gram Negative lab had two parts; the aim of the first part is to determine the concentration of gram negative bacteria in a water sample collected from a creek near Providence Road‚ Strickling. Gram negative bacteria have a cytoplasmic membrane‚ a thin peptidoglycan layer‚ and an additional outer membrane composed of phospholipids and lipopolysaccharides. Because gram negative bacteria have a relatively thin cell wall when compared to gram positive organisms‚ they are consequently unable to retain
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Introduction: Bacteria need specific living conditions to survive. The ideal conditions for bacterial growth is a warm‚ dark‚ and damp environment. This provides the maximum effectiveness for bacterial growth. The areas in our school that contain the most bacteria would be the water fountains because the bacteria from our mouths drop off on to it when we drink from it‚ and because water fountains are not regularly washed in comparison to weight equipment. Water fountains also provide a warm damp
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respiratory paralysis‚ muscular paralysis and even death. The paralysis is due to a release of a neurotoxin by the bacteria Clostridium botulinum. C. botulinum bacteria are typically present in soil‚ but can be present due to improper storage of commercially or home prepared canned food‚ preserves‚ and fermented foods. C. botulinum is rod-shaped and gram-positive (Solomon‚ Lilly 2001). The bacteria cannot be spread from contact with infected persons‚ and rarely can cause negative affects if inhaled or injected
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substance being transmitted from one generation to another. For this experiment Griffiths used two types of pneumococcus bacteria (the bacteria that is responsible for causing pneumonia). He used the smooth strain (S) which had an outer capsule that acts as a protective shield from the host’s immune system and rough strain (R) which lacked the capsule. He then injected the S-strain bacteria into the mouse‚ as a result the mouse died due to the s-strain infecting it with pneumonia. When the r-strain was
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