A seasonal study of pinealocytes in the 13-lined ground squirrel, Spermophilus tridecemlineatus

A seasonal study of pinealocytes in the 13-lined ground squirrel, Spermophilus tridecemlineatus.

A quantitative histological study of pinealocytes in the 13-lined ground squirrel, Spermophilus tridecemlineatus, was conducted over a period of one year. Consistent and statistically significant seasonal differences were found in nuclear and nucleolar dimensions suggesting a circannual rhythm in the metabolism of these cells. Annual peaks occurred during hibernation, whereas the nadirs occurre...

Sarcocystis campestris from naturally infected 13-lined ground squirrels, Spermophilus tridecemlineatus tridecemlineatus, from Nebraska.

Grossly visible sarcocysts were seen in the skeletal muscles of 1 of 12 13-lined ground squirrels, Spermophilus tridecemlineatus tridecemlineatus, collected in Nebraska. The tissue cyst wall was up to 5.0 microm thick and contained spikelike projections. Transmission electron microscopy of tissue cysts revealed they were similar to Sarcocystis campestris Cawthorn, Wobeser, and Gajadhar, 1983, p...

Transcriptional Activation of p53 during Cold Induced Torpor in the 13-Lined Ground Squirrel Ictidomys tridecemlineatus

The transcription factor p53 is located at the centre of multiple pathways relating the cellular response to stress. Commonly known as a tumor suppressor, it is responsible for initiating diverse actions to protect the integrity of the genome, ranging from cell cycle arrest to apoptosis. This study investigated the regulation of p53 protein in hibernating 13-lined ground squirrel Ictidomys trid...

Respiration in the hibernation of the 13-lined ground squirrel.

LANDAU, BARBARA R. AND ALBERT R. DAWE. Respiration in the hibernation of the r+ned ground squirrel. Am. J. Physiol. &I): 75-82. 1958. -Respiratory rate, heart rate and body temperatures were recorded simultaneously in the Is-lined ground squirrel (CiteGus tridecemlineatus) throughout the hibernating cycle. An induction trend may appear at any time during the latter part of arousal. It may lead ...

Analysis of four common play patterns in juvenile thirteen-lined ground squirrels (Spermophilus tridecemlineatus)