The Phenylalanine and Tyrosine Requirement of the Growing Chick with Special Reference to the Utilization of the D-Isomer of Phenylalanine
1957; Elsevier BV; Volume: 62; Issue: 3 Linguagem: Inglês
10.1093/jn/62.3.349
ISSN1541-6100
AutoresHans Fisher, Dewey Johnson, Gilbert A. Leveille,
Tópico(s)Biochemical Analysis and Sensing Techniques
ResumoThe utilization of D-phenylalanine as well as the requirements for L-phenylalanine and L-tyrosine by growing chicks were the subject of this report. It was found that D-phenylalanine is very poorly utilized as indicated by slow growth obtained with the D-isomer alone as well as by a higher requirement for DL-phenylalanine than for the L form. The L-phenylalanine requirement of chicks is approximately 0.5% and the L-tyrosine requirement is not more than 0.5%. It is suggested that these values be adopted in place of the old values of 0.9% and 0.7% based on former work.
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