Document Detail

Motility pattern and lung respiration of embryonic chicks under the influence of L-thyroxine and thiourea.
MedLine Citation:
PMID:  6136371     Owner:  NLM     Status:  MEDLINE    
Pressure changes in the air cell and at the egg shell have been used to monitor respiratory and somatic movements of embryonic chicks. During the prehatching period a phase of reduced activity is observed. Pulmonary respiration is initiated during this phase. Exogenous L-thyroxine exerts an accelerating effect on the hatching process and on the onset of the phase of reduced motility and of lung respiration. In thiourea-treated embryos the opposite effects on the hatching process and on the motility and respiration pattern are registered. When, however, the egg shell above the air cell was sealed with glue, times of hatching and of the beginning of lung respiration were similar to those of controls, although pipping the egg shell occurred earlier than normal. It is suggested that the effects of L-thyroxine and thiourea on the hatching process are caused by a premature or delayed onset, respectively, of pulmonary respiration.
J Wittmann; W Kugler; H Petry
Publication Detail:
Type:  Journal Article; Research Support, Non-U.S. Gov't    
Journal Detail:
Title:  Comparative biochemistry and physiology. A, Comparative physiology     Volume:  75     ISSN:  0300-9629     ISO Abbreviation:  Comp Biochem Physiol A Comp Physiol     Publication Date:  1983  
Date Detail:
Created Date:  1983-10-08     Completed Date:  1983-10-08     Revised Date:  2008-10-30    
Medline Journal Info:
Nlm Unique ID:  1276312     Medline TA:  Comp Biochem Physiol A Comp Physiol     Country:  ENGLAND    
Other Details:
Languages:  eng     Pagination:  379-84     Citation Subset:  IM    
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MeSH Terms
Chick Embryo / drug effects,  physiology*
Lung / physiology*
Movement / drug effects
Respiration / drug effects
Thiourea / pharmacology*
Thyroxine / pharmacology*
Time Factors
Reg. No./Substance:
62-56-6/Thiourea; 7488-70-2/Thyroxine

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