Search PubMed⌕ Search

Biomedical subjects

A Yuwiler

Publications and source records attributed to A Yuwiler.

At least 91 records · Page 5Linked to original sources
PubMed1970

Harderian gland: influence on pineal hydroxyindole-O-methyltransferase activity in neonatal rats.

A circadian rhythm has been found in hydroxyindole-O-methyltransferase activity of the pineal gland of blinded 12-day-old rats. Five additional hours of lighting can partly prevent the nocturnal increase in pineal hydroxyindole-O-methyltransferase activity in such rats. Removal of the Harderian gland abolishes this response to light in 12-day-old blinded animals, giving further support to the suggestion that this gland may function as an extraretinal photosensitive organ influencing the pineal gland in blinded suckling rats.

Animals↗
PubMed1970

Harderian gland: development and influence of early hormonal treatment on porphyrin content.

The porphyrin content of the rat Harderian gland remains low until 12 days of age at which time both porphyrin content and concentration rapidly increase. Intraperitoneal administration of tetraiodothyronine (thyroxine) into newborn animals advances the appearance of porphyrin in the gland. Conversely, a single injection of cortisol acetate into newborns retards the appearance of porphyrin. The time of porphyrin appearance in the gland parallels the time for maturation of the evoked cortical response to visual stimulation in normal and hormone-treated animals.

Age Factors↗