نتایج جستجو برای: ornithine decarboxylase

تعداد نتایج: 13700  

Journal: :The Biochemical journal 2001
L Shore P McLean S K Gilmour M B Hodgins M E Finbow

The control of cell-cell communication through gap junctions is thought to be crucial in normal tissue function and during various stages of tumorigenesis. However, few natural regulators of gap junctions have been found. We show here that increasing the activity of ornithine decarboxylase, or adding polyamines to the outside of cells, increases the level of gap junction communication between v...

Journal: :The Journal of biological chemistry 1971
J Jänne H G Williams-Ashman

The activity and stability of L-ornithine decarboxylase from rat ventral prostate is markedly increased by certain thiol compounds, notably dithiothreitol. The enzyme was purified about 300-fold. Many properties of the purified enzyme are described. In the absence of added thiol compounds, the purified ornithine decarboxylase apparently undergoes polymerization, as evidenced by its behavior on ...

Journal: :Journal of Biological Chemistry 1992

Journal: :Proceedings of the National Academy of Sciences of the United States of America 1971
D H Russell

Ornithine decarboxylase (EC 4.1.1.17), the enzyme that catalyzes the synthesis of putrescine from ornithine, increases dramatically in developing Xenopus embryos. Between the 2-cell stage and early blastula stage, activity increases 10-fold, and in swimming tadpoles, the enzyme activity is 100-fold higher than that present in either unfertilized eggs or 2-cell embryos. S-adenosyl-L-methionine d...

Journal: :Proceedings of the National Academy of Sciences of the United States of America 1978
A Nureddin

Ovarian ornithine decarboxylase (L-ornithine carboxy-lyase, EC 4.1.1.17) regulation was investigated in immature, pubescent, and pseudopregnant rats. After initial induction of the enzyme by injection of lutropin in the immature rat, continued daily injections resulted in a graded decrease in the activity of the enzyme. In the 32-day-old rat, the induction and subsequent decline in enzymic acti...

Journal: :Journal of clinical microbiology 1982
B A Juni J M Rysavy D J Blazevic

PathoTec strips and spot biochemical tests were evaluated for the ability to biotype Haemophilus influenzae and Haemophilus parainfluenzae. Indole, urease, and ornithine decarboxylase reactions were tested. The results of PathoTec strips compared favorably with those conventional methods; the percent agreements were as follows: indole, 100; urease, 99.5; and ornithine, 95.5. Spot tests were sim...

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