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.




This bacteria is classified as an oxidoreductase.  In the case of the oxidoreductase class, there are oxido-reductions, this is based on the donor/acceptor, and the more common name for this class is dehydrogenase.  Although, this arthrobacter globiformis can be classified as coryneform bacteria, which deals with pleomorphism and gram variability.  Some bacteria can be hard to identify. This could be because of the defficiency of the clarity of the information needed. 





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.




Arthrobacter globiformis is characterized by the variability of gram and pleomorphism.  These cells are gram-negative and narrow when they are at a young stage, but once they have matured some, they are short, gram-positive rods and coccoids.  This and other arthrobacteria are part of the actinomycete, which are nonsporulating, gram-positive bacteria.  This bacteria is similar to crystallopoietes by the fatty acid composition, although  it differs from  nicotianae in the coposition of  cocci and rods.  Arthrobacter globiformis has adapted to the amounts of oxygen that is present in it's environment, and has acquired the ability to create an anaerobic metabolism.  It also uses nitrate  in their respiratory system, as an electron receptor, to reduce ammonia via nitrite.   




     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.



From oldest to youngest:


Ø        Bacteria

Ø       Actinbacteria

Ø       Actinobacteridae

Ø       Actinomycetales

Ø       Micrococcineae

Ø       Micrococcaceae

Ø       Anthrobacter

Ø       Anthrobacter globiformis



     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.





In 1947 Conn and Dimmick discovered arthrobacter globiformis.