Ultrastructural differences in the tracheal gland between young and aged rats were studied. Marked differences were observed in the serous cells between the young (8-17 week-old) and the aged (20-30 month-old) subjects. The secretory granules of the serous cells of the young subjects were homogeneously electron dense, whilst those of the aged subjects had a bizonal appearance. These bizonal gra...

Follicular oocytes and penetrated eggs of several mammalian species have been the subject of numerous electron microscope studies (rat: Sotelo 1959, Sotelo and Porter 1959, Franchi 1960, Odor and Renninger 1960, Szollosi and Ris 1961, Guinea pig: Anderson and Beams 1960, Adams and Hertwig 1964, Austin 1965. Barron and Franklin 1968. cat: Liss 1964. man: Stegner and Waternberg 1961, Zamboni et a...

introduction: the learning procedure leads to biochemical, biophysical and ultrastructural changes in synapses of some specific areas in central nervous system, which is named synaptic plasticity. material and methods: twelve male wistar rats were divided in two (case and control) groups. the cases were trained in morris water maze. the animals underwent 8 training sessions per day, on 3 consec...

background: cadmium chloride which is potentially toxic is currently used in industry. the toxic effects of cadmium on testes have been reported to range from apoptosis to necrosis, with different effects on fertility. this research aimed to study the effect of different doses of cadmium on testicular tissues at acute stage by light and electron microscopy. methods: cadmium chloride was injecte...

OBJECTIVE To compare the histological and ultrastructural changes in skin collagen with mechanical dermabrasion and pulsed carbon dioxide laser resurfacing in the minipig model. SETTING Academic medical center. SUBJECTS Yucatan minipig animal skin model. MAIN OUTCOME MEASURES Comparison of light microscopic and ultrastructural (electron microscopic) changes in the skin following the 2 res...

The ultrastructure of inner membrane-matrix mitochondria isolated from bean (Phaseolus vulgaris) shoots was examined in different metabolic states. Gross ultrastructural transformations analogous to the condensed-to-orthodox configurational changes reported in mammalian mitochondria are observed on transistion from nonrespiring to respiring metabolism. With the induction of oxidative phosphoryl...

introduction: the aim of this study was to determine the orphological and ultrastructural changes ofampullary portion of mouse fallopian tube after ovarian hyperstimulation and progesterone injection duringimplantation period. material and methods: for this purpose 6-10 weeks old nmri mice were hyperstimulated using hcgand hmg injections. in one group of hyperstimulated mice daily injection of ...

The structural differences between  dormant and nondormant seeds of wild oats (Avena ludoviciana Durieu) were studied by light and transmission electron microscopy. Radial elongation of  scutellum epithelial cells were observed in nondormant seeds after imbibition, compared with dormant seeds in which cells were completely compressed. Ultrastructural differences for example, dilution of cytopla...