摘要:

Ultrastructural histochemistry for plasma membrane nonspecific alkaline phosphatase was performed on the normal and regenerating choriocapillaris (CC) of rabbits. In normal animals the CC endothelium expressed little or no staining, whereas in regenerating CC the endothelium exhibited staining. The staining was most intense at the un-fenestrated plasma membrane. As the capillaries matured and the fenestrated plasma membrane became more extensive, the staining was reduced and eventually eliminated. Pericytes did not stain in normal or regenerating CC.

ISSN:1422-6405    

DOI:10.1159/000147137

出版商:S. Karger AG    

年代:1991

数据来源: Karger

摘要:

The alveolar brush cells in the rat lung were observed by transmission electron microscopy. The general structural features of the brush cells in this report were basically in agreement with earlier descriptions. However, this report is the first to detect long, thick microvilli with a unique form protruding into the alveolar lumen in parallel with the basement membrane, not vertically to the basement membrane. Moreover, intranuclear inclusions in the nucleus were observed for the first time in the alveolar brush cells in this study.

ISSN:1422-6405    

DOI:10.1159/000147138

出版商:S. Karger AG    

年代:1991

数据来源: Karger

摘要:

The pattern of arterial supply to the various parts (clavicular, sternocostal and aponeurotic) of the pectoralis major muscle was studied in 7 cadaver dissections and 10 angiograms by injecting a radio-opaque substance. Three main arteries supplied the muscle, i.e. the pectoral branch of the thoracoacromial trunk (TAT-PB), the lateral thoracic artery and the perorating branch of the internal thoracic artery, supported by other branches of the TAT and the superior thoracic artery. It is observed that the TAT-PB, a chief vascular pedicle, anastomoses freely with other arteries and supplies most parts of the muscle. The present study is mainly focussed on the exclusion of the chief vascular pedicle of muscle to eliminate the confusion of previous studies and prevent the unnecessary hindrance and complications of the muscle flap.

ISSN:1422-6405    

DOI:10.1159/000147139

出版商:S. Karger AG    

年代:1991

数据来源: Karger

摘要:

The presence of basic fibroblast growth factor (bFGF) in the third and the lateral ventricular ependyma of the rat has been investigated under the light microscope using a polyclonal antibody against bFGF, through the unlabelled peroxidase-antiperoxidase procedure; bFGF-immunoreactivity (bFGF-IR) is observed in the entire ependymal cell layer of ventricles. Also ependymal tanycytes within the inferior portion of the wall and floor of the third ventricle show bFGF-IR. Tanycytic processes are in close contact with hypothalamic capillaries. The present study strongly suggests that brain ependymal bFGF plays unidentified roles unrelated to its angiogenic or mitogenic capacities.

ISSN:1422-6405    

DOI:10.1159/000147140

出版商:S. Karger AG    

年代:1991

数据来源: Karger

摘要:

The localization and distribution of some cytoskeletal protein components were studied by immunostaining methods in normal and ostosclerotic osteoblast-like cells. The protein components investigated were microtubules (β-tubulin), intermediate filaments (vimentin), microfilaments (actin and myosin) and structural proteins (α-actinin and fibronectin). Although the mechanism is not yet clear, the alterations observed in the pathological cells could well play a role in the expression of otosclerosi

ISSN:1422-6405    

DOI:10.1159/000147141

出版商:S. Karger AG    

年代:1991

数据来源: Karger

摘要:

The intima of the adult human aorta consists of three sublayers: a muscular layer lying next to the media, a median hyperplastic layer and an innermost connective tissue layer, adjoining the lumen. The cells inhabiting these sublayers were isolated by the method of alcoholic-alkaline dissociation from grossly normal areas, fatty streaks and atherosclerotic plaques. The populations obtained contained cells with different numbers of cytoplasmic inclusions and a number without any. In unaffected intima and in fatty streaks, the cells with lipid inclusions were found predominantly in the outermost intimal layer including the connective tissue and in part of the median hyperplastic layer. In the superficial layer of unaffected intima and the fatty streak, these cells accounted for 15 and 25% of the total cell population, respectively. In the plaque, most cells with lipid inclusions were localized in the median hyperplastic layer of the intima (10%). The muscular layer was characterized by the lowest content of cells with lipid inclusions both in the unaffected intima and atherosclerotic lesions (from 0.75% in unaffected intima to 5% plaques). Among the intimal smooth muscle cells of various shapes, the cells with lipid inclusions were most often found in the stellate cell subpopulation (5–35%). A possible role of stellate cells in atherogenesis is discusse

ISSN:1422-6405    

DOI:10.1159/000147142

出版商:S. Karger AG    

年代:1991

数据来源: Karger

摘要:

Parathyroid cells responded to estradiol application in rats by increment in surface area of the compartments concerned with parathyroid hormone secretion, i.e. the rough endoplasmic reticulum, Golgi complex and secretory granules [1]. We thus compared the morphology of parathyroids of male rats with those of females of the same age and same weight, respectively. Morphometric analysis revealed that (i) the mean cell volume was significantly larger and, consequently, the number of parathyroid cells lower expressed per 1 mm3 tissue and (ii) the surface area of the Golgi complex was larger expressed per mean parathyroid cell volume and per 1 mm3 tissue in female rats than in males. Diversity in cell volume seems to depend on age rather than on sex, whereas diversity in the Golgi complex is considered to be sex related. The physiological implications remain to be clarified.

ISSN:1422-6405    

DOI:10.1159/000147143

出版商:S. Karger AG    

年代:1991

数据来源: Karger

摘要:

The behaviour of the granulation of the myo-epithelioid cells of the juxtaglomerular apparatus of the kidney and its relationship with the plasma concentrations of renin, sodium and potassium, and plasma osmolality have been studied in male and female Wistar rats that have been subjected to a programme of moderate physical exercise throughout their period of growth. In the trained rats a significant increase in the juxtaglomerular granulation index and a significant decrease in plasma renin concentration has been observed, the changes being more prominent in the female animals. Moreover in the trained rats significant increases in plasma sodium, potassium and osmolality have been observed.

ISSN:1422-6405    

DOI:10.1159/000147144

出版商:S. Karger AG    

年代:1991

数据来源: Karger

摘要:

The light-microscopical and ultrastructural differentiation of the disseminate prostate was studied in 12 boars and 8 barrows, ranging in age from 8 to 28 and 12 to 27 weeks, respectively. The barrows had been castrated at the age of 8 weeks. In young boars the prostate is organized in an inner zone and an outer zone. The glandular tubules of the latter are more differentiated than those in the inner zone. Sexual maturation in the prostate is characterized by almost complete reduction of the inner zone and concomitant enlargement of the outer zone. This differentiation of the inner zone occurs progressively and is manifested by a higher density of the glandular tubules, by a decrease in the number of basal cells and by an increase in the secretory tubular cells containing more microvilli, organelles and secretory vesicles. A few weeks after castration, the characteristic morphology of the undifferentiated inner zone is found throughout the entire glandular layer. The number of glandular tubules in barrows has decreased, and their cells show minimal secretory activity, nuclear indentations and a decrease in their organelles. A further castration effect is vacuolization of the perinuclear cytoplasm in numerous glandular cells.

ISSN:1422-6405    

DOI:10.1159/000147145

出版商:S. Karger AG    

年代:1991

数据来源: Karger

摘要:

A comparative morphometric study of ventricular myocardial cells of the West African insect-eating bat, Pipistrellus pipistrellus the hamster and the rat revealed significant differences in volume fractions of mitochondria, myofibrils, lipid bodies and T tubules. In the cells of the bat, mitochondria constitute 35% of cytoplasmic volume compared with 29 and 30% in the hamster and rat, respectively. Notably, crista density is much higher in the bat cells (3.58 × 105 cm–1) than in those of the hamster (2.59 × 105 cm–1) and of the rat (2.48 × 105 cm–1). Myofibril concentration is 40% in the bat, 53% in the hamster and 55% in the rat. There is greater numerical density of lipid bodies in the bat (212.27 × 109 cm–3) than in the hamster (139.20 × 109 cm–3) and in the rat (114.00 × 109 cm–3). The volume occupied by T tubules is 0.02 in the bat and hamster, and 0.009 in the rat. These differences suggest structural design for efficient metabolic activity in the bat which, among mammals, has high e

ISSN:1422-6405    

DOI:10.1159/000147146

出版商:S. Karger AG    

年代:1991

数据来源: Karger