plate seemed to show that E. coli did not have lipases because it did not have clear zones. Staphylococcus aureus seemed to have these clear zones meaning it can secrete lipases. The bacteria Bacillus subtilis did not grow well to see if there was a clearing. After doing some research‚ it was shown that B. subtilis is lipase positive so there should have also been some clear sones like the Staphylococcus aureus (Watson). The DNAse agar could not have been analyzed because HCl was not available to
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bacteria. Enteric. 2. The outer layer of the skin is the _________ while the deeper layer is the _________ cutaneous‚ keratin. dermis‚ sebum. mucous‚ epidermis. epidermis‚ dermis. sebum‚ keratin. 3. A massive lesion caused by the spread of Staphylococcus aureus infection (often on the neck and upper back) is called a ________ boil. furuncle. Carbuncle. abscess. pustule. 4. Scalded skin syndrome is caused by exotoxins (exfoliatins)
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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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blue onto the smear for 30 second‚ rinsed with water‚ blotted dry and observed the slide using oil immersion. Gram Stain For comparison purpose‚ I used two bacteria for this experiment. They are E. coli‚ a gram negative bacteria and Staphylococcus‚ a gram positive bacteria. I prepared a heat fixed smear of both bacteria. First‚ I used crystal violet as my primary stain‚ put few drops of it on the smear and let it sit for 30 seconds.
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9/20/2013 Methicillin-Resistant Staphylococcus aureus Methicillin-Resistant Staphylococcus aureus also known as MRSA is a bacteria frequently found on the skin of generally healthy people. MRSA is usually spread through skin to skin contact or contact with an object containing the bacteria. Most of the time you may be carrying the bacteria but you are not ill. Mostly people with weak immune systems and have been in health care centers
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positive microorganisms. Materials: Microscope‚ Bunsen burner‚ glass slide pipette‚ loop‚ distilled water‚ nutrient agar of Escherichia coli‚ nutrient agar of Staphylococcus aureus‚ crystal violet‚ gram iodine‚ ethanol‚ safranine‚ oil immersion‚ a piece of napkin ‚ holder. Method: As per manual. Bacteria stained- Escherichia coli and Staphylococcus aureus. Results: Gram-negative bacteria are bacteria that do not retain
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HOW TO WRITE AN UNKNOWN LAB REPORT IN MICROBIOLOGY GENERAL Unknown reports in microbiology are written in scientific format. Scientific writing is written differently from other types of writing. The results of the exercise or experiment are what are being showcased‚ not the writing. The purpose of scientific writing is not to entertain‚ but to inform. The writing should be simple and easy to understand. There is a specific style that must be followed when writing scientific reports.
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Lab Results E. coli is MR+ because it does ferment glucose and the has a high acidity produced during the fermentation. E Coli is VP- because it does not make acetyl methyl carbinol‚ a neutral product. E. Coli produces more acidic products S. epidermidis is MR+ and is VP+ because it first changes to acidic products then is able to convert those acidic products into some neutral basic products so it gives both positive results. Organisms and Metabolism Organisms possess different biochemical
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There are various infective agents being battled every single day. These pathogens continue to grow‚ multiply and evolve as humans also continue to find a way to avert their emergence and contend against their harmful effects. One of them is Staphylococcus aureus. “Staph”‚ as it is more commonly known‚ is one of the most common causes for skin infection. They are Gram- positive bacteria‚ spherical in shape and occur in grape-like clusters. These organisms are resistant to high temperatures (as
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Lab Practicum‚ Micro 200‚ study guide When you did your hand wash experiment‚ you decided a variable to test‚ say‚ hot vs cold water‚ you called this variable an “experimental variable” since it was the variable you were testing experimentally. In order to get meaningful data‚ you need to keep other things the same‚ for example the washing time had to be the same for both‚ you called the washing time a _Control_______ variable. Through the semester‚ you have used two bacteria that produce
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