Evidence for the Absence of the Urea Cycle in <i>Tetrahymena</i>* is a research paper published in The Journal of Protozoology (1957). On theSindex it has a DataRank of 1.9. It has been cited 22 times, with 19 citing works in its 1-hop citation network.
SUMMARY. Strains E, S and W of Tetrahymena pyriformis were examined for their ability to carry out the reactions of the Krebs‐Henseleit urea cycle, using growth and enzyme studies. None of the strains was able to grow on either citruliine or ornithine in place of arginine, and proline was as active as citrulline or ornithine in sparing arginine. So little citrulline or arginine was synthesized by cell‐free preparations as to be of no significance in the growth or nitrogen metabolism of the ciliates. Slight arginase activity could be detected in homogenates, but no urea was found in cultures. No urease activity could be detected using urea‐C14.
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Base Score Contribution
0.470
From this paper's citation signal
Citation Network Contribution
1.5
From 18 citing papers with measurable signal
DataRank blends this paper's own citation count with the influence of the papers that cite it. Here, roughly 24% comes from its base citations and 76% from the citation network (18 citing papers contributed measurable signal).
Citers are pulled from OpenAlex sorted by cited_by_count:descand capped per paper, so when the cap binds we keep the highest-signal references and the score is reproducible across reruns.
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