Microbiology: Alcaligenes Faecalis Bacteria

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Microbiology is a study of small living organisms that are hard to be seen without using the microscope; such as bacteria, archaea, viruses, and protozoa. Fungi are different, a majority are big enough for us to see. They’re all have a long history of living on Earth, the scientist also believes they are the first living things that are existing way before mammals or human. Those microorganisms are everywhere around us, some are harmless and some can cause serious diseases. The condition and environment are different for every microorganism, some can live in the cold and a few can live in an area where hardly any living things can survive in. However, the bacteria that I found the most interesting in is Alcaligenes faecalis bacterium because…show more content…
faecalis is belonged to Alcaligenes genus in Alcaligenaceae family, according to Foundations in Microbiology: “It is a group of non-fermentative, oxidase-positive, motile bacteria … Members of Alcaligenes live primarily in soil and water habitats, and they may also become established as normal microbiota. The most common clinical species. A. faecalis, is isolated from feces, sputum, and urine. It is occasionally associated with opportunistic infections such as pneumonia, septicemia, and meningitis” (pg. 612). A. faecalis bacterium has those characteristics such as tiny size, thin/ rod/ coccobacillus shaped, a light cream color that is growth at room temperature (37 Celsius degree) as least from 24 to 48 hours to be seen. The bacteria also preferably to growth on nutrient agar slant broth and medium; the elevation is flat. Base on my observation, it is a gram-negative aerobe bacteria have motile and flagellated because when I looked under the microscope for gram-stain with oil immersion lens, and the color of the bacterium is pink. Moreover, Microbacteria: A Laboratory Manual does provide a chart on page 216 giving all of the important of cultural and biochemical characteristics about A. faecalis bacterium; litmus milk reaction test results as alkaline, fermentation including lactose, dextrose, and sucrose are having negative results, majority tests are negative except citrate test (can be positive or negative), catalase activity, and oxidase activity is giving positive
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