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Adaptation by Ruminants to Finishing Rations Supplemented With Urea or Protein
Abstract
"If the mysterious influence to which the dissymmetry of natural products is due should come to change in sense or direction, the con- stituting elements of all living beings would take an inverse dissymmetry. Perhaps a new world would be presented to us. Who could foresee the organization of living beings, if the cellulose which is right should become left, if the left albumin of the blood should become right? There are here mysteries which prepare immense labors for the future and from this hour invite the most serious meditations of science" MEISTER (1).In such reflections we are reminded that the orientation of the amino acids of the earth is not wholly uniform. Thus, in their free state as well as in higher organisms they are almost exclusively of the L stereochemical configurations. Although the enantiomeric D amino acids appear to be confined to the microorganisms and a limited number of annelids, insects and plants, their occurrence is by no means a freak of nature (2,3). Their occurence immediately raises several questions concerning the means by which they have been utilized and produced in the cell, presumably from L amino acids.
Subject Area
Animal sciences
Recommended Citation
ARMBRUSTER, STEPHEN LEE, "Adaptation by Ruminants to Finishing Rations Supplemented With Urea or Protein" (1974). ETD collection for University of Nebraska-Lincoln. AAI7423866.
https://digitalcommons.unl.edu/dissertations/AAI7423866