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Combined-Notes

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Saved by erichardson@...
on December 8, 2008 at 8:38:12 pm
 

 

Gram Stain

     The gram stain of Arthrobacter globiformis can change during the course of its life. There are two different stages of its life. In the early stage, the bacterium is long, slender, and gram negative. However, within 30 hours, it has changed into a short, gram positive rod or coccoid. Arthrobacter globiformis is nonsporulating, which means it does not produce spores. It is also a member of the actinomycete branch of gram positive bacteria.

Beneficial Requirements

     This bacterium is very helpful to its environment in multiple ways. For one thing, it can oxidize ammonium into hydrylamine, nitrite, and nitrate. This means that it is a good source of nitrogen for the plants that require the nitrogen to grow. Another thing it does is help reduce pesticides and other harmful chemicals in the soil. Most plants cannot grow in the presence of hexavalent and trivalent chromium. Arthrobacter globiformis, however, is able not only to grow in it, but to help reduce the amount of trivalent chromium in the soil. So, this bacterium is a great help to its environment and the ecology.

Habitat

     Arthrobacter globiformis is found mostly in the soil. It helps make the soil healthy for the other plants to live in. It can fix nitrogen, which is very helpful to the other plants, and help reduce the amount of harmful chemicals that can damage the other plants.

Reproduction

     Like most bacteria, Arthrobacter globiformis reproduces asexually by binary fission. During this process, the DNA of the first    cell is duplicated. Then each strand of DNA attaches to the plasma membrane. The cell lengthens and causes the chromosomes to split. Then the plasma membrane grows in until the cell splits into two separate cells. The DNA of the two cells produced from this process is identical.

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