master my skills of using the Gram stain‚ testing for catalase‚ testing for coagulase and using the oxacillin screen. Now I am going to take you with me on the journey to the unknown. As I recall from earlier that semester‚ the first test that needed to be performed was the Gram stain. The Gram stain is a staining technique that aids in distinguishing cell wall characteristics and the cellular morphology. Bacteria will stain Gram positive‚ which is a purple color‚ or Gram negative‚ which is a pink
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procedure called gram stain is used in the identification of bacteria. Bacteria can be gram-positive‚ gram-negative‚ or gram-variable. Most bacteria however‚ are usually gram-positive or gram-negative. Gram-positive and gram-negative bacteria react differently to staining because of the differences in their cell walls. Bacterial cell walls contain a polymer called peptidoglycan. Gram-positive bacteria have more of this polymer than gram-negative bacteria. They are also less complex than gram-negative
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produce a magnified image? How does a lens produce a magnified image? 3) What are some ways to increase contrast in microscopy? 4) Define: simple stain‚ differential stain and special stain. 5) What are the steps in a gram stain? 6) How can staining aid in the diagnosis of TB? 7) In general‚ can viruses be imaged with a light microscope? 8) Are all bacteria microscopic (beyond the ability to see with the naked eye)? Prokaryotic structure and function 1) What
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The cell wall maintains the integrity of the cell. The cell wall helps protect the cell against the environmental changes it it allows most molecules to pass through it. This layer is composed of molecules called peptidoglycans. Just inside the cell wall is a less rigid envelope called the plasma membrane also known as the cytoplasmic membrane. In bacterial cells the plasma membrane has two primary functions: it serves as a selective barrier to molecules that are penetrating the cell wall allowing
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Question 1 | | 1 / 1 point | Microbes are not responsible for ________. | | synthesis of acetone and alcohol | | | breaking down wastes | | | synthesis of vitamins | | | antibody production | | | oxygen generation via photosynthesis | View Feedback | | Correct! | Question 2 | | 1 / 1 point | The cell theory states that ________ are made up of cells. | | protozoa | | | archaea | | | plants | | | all living things | | | animals | Question
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categories‚ such as‚ morphology‚ physiology‚ antibacterial susceptibility‚ selective media‚ and biochemical provide results. Both the unknown isolate and members of the Micrococcus genus were shown to be obligate aerobes. By using staining methods‚ this proved that the organism is gram positive. Morphology‚ such as‚ orange pigmentation and coccus shape provide similarities to the Micrococcus genus. Physiological tests were shown to be obligate aerobe‚ mesophile‚ neutrophile‚ and osmotolerant organism. Biochemical
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|COLOR BEFORE:RED LIGHT |GROWTH/NON-FERMENTATION | |PHENOL/ SUCROSE |COLOR BEFORE: RED |YELLOW | |GRAM STAIN |COLOR BEFORE:PINK |POSITIVE/COCCI
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Helicobacter pylori | Description | Helicobacter pylori is a motile‚ curved‚ spiral‚ or straight‚ slightly plump‚ gram-negative rod. It is believed to be a major cause of gastritis and peptic ulcers although it resides solely on the gastric mucosa and does not enter cells. Microscopic description for the family Campylocbacteraceae | Shape: Spiral ShapedStaining Reaction (Gram): NegativeUnique Characteristic: Spiral Shaped with Flagellum Single/Clusters: ClusterSpore Formation: NoDimension:
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If bacterial meningitis is suspected several tests sound be done before beginning treatment. A blood sample should be taken and a complete blood count (CBC) should be performed and a lumbar puncture should also be performed as soon as possible. Laboratory findings The white blood cell count (WBC) should be 5‚000-10‚000 /mm3. Critical values associated WBC are 30‚000 /mm3. Variables that may increase white blood cell count include: Physical activity and stress‚ final months of pregnancy and/or labor
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has a hydrophobic and hydrophilic which means it only lets certain substances through. * There are also protein molecules that are responsible for transport of ions‚ nutrients and waste. * The Gram stain is used to determine the different structures of cell walls. * Gram +ve
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