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A new method for producing a circumscribed injury in rat myocardium is described. It utilises laparotomy and freeze-thawing across an intact diaphragm. Morbidity and mortality are negligible because the chest and pericardial cavities, the major coronary vessels, and the major branches of the conduction system remain intact.
View Article and Find Full Text PDFUltrastructure of the perivascular nerve plexuses of the rat pancreas.
Acta Anat (Basel)
February 1981
The fine structure of the arteriolar perivascular and capillary nerve plexuses of the pancreas was studied in the rat. In perfusion-fixed control specimens, occasional profiles which contained accumulations of large dense-cored vesicles and numerous profiles which contained mainly small vesicles were seen in sections of the nerves. Counts of degenerating axons in specimens from rats treated with 6-hydroxydopamine and of profiles in which the small vesicles contained dense cores in specimens fixed by immersion after incubation in buffer indicated that the arteriolar perivascular plexus contains much larger numbers of adrenergic axons than the plexus associated with the capillaries.
View Article and Find Full Text PDF[Ultrastructural analysis of the effect of vagotomy on the state of the exocrine portion of the rat pancreas].
Arkh Anat Gistol Embriol
December 1979
Dynamics of reactions in the main components of the exocrine part of the rat pancreas (capillary, nerve, pancreocyte) was subjected to ultrastructural analysis at bilateral subdiaphragmatic vagotomy within 24 hours--30 days. It was stated that certain ultrastructural shifts developed in all the components mentioned above; at first they are within the limits of physiological parameters (the first three days), and then destructive processes occur (up to destruction of a part of cells) reaching their maximum by the end of the first--beginning of the second week and having a focal character. Then compensatory-recovery rearrangements begin to predominate, and by the 30th day they result in a considerable but not yet complete normalization of the ultrastructural organization of the gland.
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