Dictionary » O » Ornithine



(Science: amino acid) Is made from the amino acid arginine and in turn is a precursor to form glutamic acid, citruline and proline. Ornithine's chief therapeutic value lies in its involvement in the urea cycle and its ability to enhance liver function, protect the liver and detoxify harmful substances. It has been used in the treatment of hepatic coma states. It also helps release a growth hormone that metabolises excess body fat when combined with arginine. This growth hormone is also an immune stimulant. In animal studies arginine and ornithine have improved immune responses to bacteria, viruses and tumour cells.

It is found in milk products and meat, especially chicken. It may cause insomnia and is contraindicated for schizophrenics.

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Location of mutation in E. Coli biosynthetic auxotroph

... isolated a mutant, streaked it onto pool plates and determined that it grows on minimal medium with the following additions: proline, arginine, ornithine, aspartic acid, proline, glutamic acid, inositol. Since the mutant was mutagenized according to 99.9% killing etc. it should only be a single ...

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by Jeaneai
Mon Nov 26, 2012 4:56 pm
Forum: Genetics
Topic: Location of mutation in E. Coli biosynthetic auxotroph
Replies: 0
Views: 1404

Help with bacteria identification!

... motile. If I understand your results correctly, your bacteria is: Lactose/sucrose +ve (EMB, TSA) H2S -ve (no black in TSA) Motility +ve Indole -ve Ornithine -ve Urease -ve Than your choices are among Citrobacter freundii, Hafnia avlei, Serratia rubideae... You either need a list of possibilities ...

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by Cat
Sun Sep 09, 2012 7:26 pm
Forum: Microbiology
Topic: Help with bacteria identification!
Replies: 1
Views: 3011

Microbiology help in identifying Gram + rod for my unknown

... not done it right, that was a little iffy citrate= - oxidase= - catalase= + Gelatin liquefaction= - starch=- casein=+ urease= + Indole= - Dnase= + ornithine decarboxylase= - Lysine decarboxylase= + Arginine decarboxylase= - Any help would be great I have been racking my brain over the bacillus ...

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by ccapelouto838
Thu May 03, 2012 5:21 am
Forum: Microbiology
Topic: Microbiology help in identifying Gram + rod for my unknown
Replies: 12
Views: 10889

Help identifying unknown bacteria

... broken down, indole positive, no sulfur reduction decarboxylation tests- decarboxylation- org has enzymes to break down lysine, arginine, and ornithine catalase test- catalase positive I was thinking my organisms could be pseudomonas aeroginosa, ANy advice would be greatly appreciated

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by anthony7
Sun Apr 01, 2012 9:21 pm
Forum: Microbiology
Topic: Help identifying unknown bacteria
Replies: 8
Views: 5876

Cellular Locations

Amino acids are both in cytosol and in mitochondria, but I think, that yes, arginase is in cytosol. Look to Stryer's Biochemistry for the ornithine cycle, I'm sure, there is depicted the localisation of all of them ;)

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by JackBean
Fri Dec 11, 2009 9:24 am
Forum: Cell Biology
Topic: Cellular Locations
Replies: 1
Views: 1148
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