Showing papers by "National University of Cuyo published in 1978"
TL;DR: The results obtained suggest that the colloids is originated at least in part by involuted pituitary cells, and there is also evidence that the follicular cavities of the Pars distalis and the cleft are continuous structures.
Abstract: The epithelium of the pituitary cleft and its colloid have been studied at the ultrastructural level in normal, adrenalectomized, castrated, dehydrated and lactating adult rats. Both control and experimental animals showed cells in different stages of degradation inside the cleft and mixed with the colloid. These exfoliated cells seems to have originated from the cleft's epithelium of the adjacent granular cells. In adrenalectomized and castrated rats the rostral epithelium of the cleft had large intercellular spaces that in some instances appeared to open directly into the cleft. Occasionally, the adenohypophysial canaliculi of the adrenalectomized rats were also seen connecting with the cleft. In lactating and castrated animals dark cells appeared more frequently in the rostral and caudal epithelium of the cleft. The results obtained suggest that the colloids is originated at least in part by involuted pituitary cells. There is also evidence that the follicular cavities of the Pars distalis and the cleft are continuous structures.
29 citations
TL;DR: Results indicate that the two tricyclic drugs were able to produce general and behavioral modifications in both mothers and their litters, and these modifications seem to depend on whether the drug is given before pregnancy or during nursing.
Abstract: The effects of the oral administration of imipramine (IM) or clomipramine (CIM) in adult female rats before pregnancy or during nursing were evaluated. IM caused a significant decrease of body weight in both groups of animals and affected the body weight of litters when administered during nursing. CIM reduced the increase of weight in the mothers throughout the experiment. Both IM and CIM decreased water and food intake and locomotor activity of the adult rats. Rats treated during nursing with IM showed decreased maternal behavior at various times of treatment. The milk intake of pups from drug-treated mothers also decreased. Pup eyeopening was delayed by CIM both before pregnancy and during nursing and by IM treatment during nursing. Vaginal opening was retarded in female litters from mothers treated during nursing. Openfield behavior showed modifications at 60 days of age in male pups from mothers exposed to IM during nursing. Results indicate that the two tricyclic drugs were able to produce general and behavioral modifications in both mothers and their litters. These modifications seem to depend on whether the drug is given before pregnancy or during nursing. Control experiments in dams fed with a restricted diet suggest that the observed alterations in maternal behavior and litter development is not due to the undernourishment caused by drug administration.
27 citations
TL;DR: In this article, the electron emission yields from clean Al, Cu and Ag under 2-50 keV H +, D +, H 2 + and D 2 + impact were measured and found that molecular ion yields are lower than twice the yield of atomic ions.
23 citations
TL;DR: The apical surface of the midgut epithelium in fasted Triatoma infestans shows a striated border covered by a surface coat thatCytochemical techniques suggest that the extracellular coating contains glycophospholipids and acid phosphatase.
21 citations
TL;DR: In male rats under pentobarbital anesthesia, LH levels seemed to be affected maximally with a stimulus frequency rate of about 50 Hz applied to the POA-SQ region, suggesting a potential physiological role of frequency discrimination in the functional segregation of LH and prolactin release controls.
11 citations