Fetally Decapitated Pigs
نویسنده
چکیده
The effect of decapitation on semitendinosus muscle growth and development was studied in the fetal pig. Pig fetuses were decapitated at 45 d of gestation and histochemical and biochemical analyses conducted at 110 d of gestation. Decapitation prevented or delayed the conversion of secondary fibers from Type II to Type I histochemistry as is characteristic of the normal semitendinosus. Morphological analyses indicated either a prolonged stage of secondary myofiber formation or an inhibition of secon-dary myofiber hypertrophy in muscle from decapitated fetuses. Biochemical and histochemica1 analyses indicated that muscle from decapitated fetuses was biochemically and chemically immature compared with that from normal fetuses. (
منابع مشابه
Prenatal exposure to fetally toxic work environments: the dilemma of the 1978 Pregnancy Amendment to Title VII of the Civil Rights Act of 1964.
متن کامل
Safe orthotopic transplantation of hearts harvested 24 hours after brain death and preserved for 24 hours
OBJECTIVES The aim of this study was to demonstrate safe orthotopic transplantation of porcine donor hearts harvested 24 hours after brain death and preserved for 24 hours before transplantation. DESIGN Circulatory normalization of brain dead (decapitated) pigs was obtained using a new pharmacological regimen (n = 10). The donor hearts were perfused at 8 °C in cycles of 15 min perfusion follo...
متن کاملListeriosis in the pregnant guinea pig: a model of vertical transmission.
Feto-placental infections represent a major cause of pregnancy complications, and yet the underlying molecular and cellular mechanisms of vertical transmission are poorly understood. Listeria monocytogenes, a facultative intracellular pathogen, is one of a group of pathogens that are known to cause feto-placental infections in humans and other mammals. The purpose of this study was to evaluate ...
متن کاملDecapitation impacting effect of topically applied chlorpyrifos on acetylcholinesterase and general esterases in susceptible and resistant German cockroaches (Dictyoptera: Blattellidae).
The effect of topically applied chlorpyrifos on acetylcholinesterase and other esterases in heads and decapitated bodies of CSMA and Crawford German cockroaches was examined with spectrophotometric enzyme assay and native polyacrylamide gel electrophoresis. The toxicity of chlorpyrifos was greatly reduced in decapitated CSMA male cockroaches with LD50 value 17.1-fold higher than that of normal ...
متن کامل1,25-Dihydroxyvitamin D3 injections into rat fetuses : effects on fetal plasma calcium, plasma phosphate and mineral content.
The in vivo effects of 1,25-(OH)2D3 were assessed using fetuses from normal and thyroparathyroidectomized (TPTX) pregnant rats. 21.5-day old decapitated fetuses from TPTX mothers exhibited lowered basal plasma calcium, elevated basal plasma phosphate and an increased percentage of total ash compared to intact littermates. In decapitated fetuses from normal mothers, neither plasma calcium nor pl...
متن کامل