classification of the invisible bacterial life. Bacterial classification is based on several major properties‚ CLASSIFICATION OF BACTERIA BASED ON GRAM STAINING This method of classification of bacteria was discovered by Hans Joachim Christian Gram 1883‚ a Danish Physician‚ while attempting to differentiate bacteria from human tissue by different staining methods. He noted differences in stain retention by bacteria due to
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MBK Lab 01 – Lab Report Name: ____________________ Section: ___________________ EXPERIMENT 1 TITLE: Observing Bacteria and Blood OBJECTIVE: To gain functional knowledge of microscope operations through practical applications of a microscope in the observation of bacteria and blood. PROCEDURES: Using the microscope‚ an oil immersion lens and observing Bacteria Cultures in Yogurt . Preparing a Blood Slide and observing Blood: After reviewing the section of the manual
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phagosome. This trouble-making characteristic of MTB made its identity obscured to be the diagnosed at the time when it was first discovered. This was because MTB was neither Gram negative or positive when it was Gram stained. Finally‚ the scientists employed different way of staining called acid-fast staining. Acid fast staining This technique allowed the scientists to diagnose the MTB. However‚ its treatment still remains somewhat problematic despite of its effective antibiotic treatment. This is
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mitosis and meiosis. 2) Differentiate gram-positive and gram-negative bacteria. a) A gram positive bacteria remains colored with gram staining even after washing with alcohol or acetone‚ whereas gram negative bacteria does not retain the stain when washed with alcohol or acetone. A gram positive bacteria outer membrane is absent and gram negative bacteria outer membrane is present. A gram positive bacteria’s peptidoglycan layer is 20-80 nm thick‚ whereas a gram negative bacteria’s cell peptidoglycan
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bacteria and how they stain‚ whether it be gram positive or gram negative. Hypothesis: If I read the textbook and use the resource websites‚ then I will be able to better understand prokaryotes and describe the structural characteristics of viruses. By understanding prokaryotes‚ I can compare them to eukaryotes and learn more about the different types of prokaryote species. Experiment: Materials: Campbell Biology Textbook Lab 2 Prokaryote packet Website for gram stains: http://learn.chm.msu.edu/vibl/content/gramstain
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investigations of each unknown in Table 1 by completing the following steps: 1) Apply the stain to your first unknown slide and examine it under the microscope. 2) Record the shape of the bacteria‚ the arrangement of the bacteria‚ and the gram staining characteristics. 3) Analyze and record the G+C content of the sample by dragging the DNA tube that corresponds to the bacterial sample to the GC Content Measuring Apparatus. (Note: the identification of the DNA tubes may be confusing;
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2. Material and methods 2.1 Sample collection The following 14 samples of Staphylococcus aureus were used in this study. All samples were obtained from food contact surfaces at three food premises in University of Putra Malaysia (UPM). Samples were collected from the surface of each material according to standard swabbing techniques. The collection was carried out during weekdays (15:00-17:00) after finished the preparation of foods. Sterile swabs were removed from the coded test tubes that contain
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Bibliography: © The McGraw−Hill Companies‚ 2002 E X E RC I S E © The McGraw−Hill Companies‚ 2002 Gram Positive 38. General Unknown © The McGraw−Hill Companies‚ 2002
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metabolic and biochemical process. The gram stain distinguishes between Gram positive and Gram negative bacteria based on the composition of the cell wall. The Gram stain procedure distinguishes between Gram positive and Gram negative groups by coloring these cells red or violet. Gram positive bacteria stain violet due to the presence of a thick layer of peptidoglycan in their cell walls‚ which retains the crystal violet these cells are stained with. Gram negative bacteria stain red‚ because it
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Microbiology! 1) Groups of Organisms (7): Eukaryote: TRUE nucleus 1. Fungi 4. Bacteria 2. Algae 5. Rickettsia 3. Protozoa ! Prokaryote: NO Nucleus Ribosome is the only Organelle 6. Mycoplasma (7. Viruses: No cell structure‚ ARE NOT CELLS) Microorganisms are: ! UBIQUITOUS! ! HARMLESS IN THEIR NORMAL HABITAT ! OPPORTUNISTIC (If they leave their normal habitat and get into us) 2) Roles of Microorganisms: (Bacteria and Fungi are “Semi-Good”) - digestion -
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