Fine Structural Changes of the Porcine Oviductal Epithelium During Late and Term Pregnancy

1976 ◽  
Vol 34 ◽  
pp. 150-151
Author(s):  
R. K. Nayak ◽  
E. N. Albert
Keyword(s):  
Estrous Cycle ◽  
Early Pregnancy ◽  
Structural Changes ◽  
Ultrastructural Changes ◽  
Secretory Cells ◽  
Corpora Lutea ◽  
Term Pregnancy ◽  
Electron Microscopic ◽  
Uterine Tube ◽  
Microscopic Studies

The characteristic ultrastructural changes in the ciliated and secretory cells of the tubal epithelium of adult gilts during the estrous cycle have been described (1). Earlier light microscopic studies revealed that pregnancy inhibited the cyclic alterations in the tubes of the sow and the epithelium appeared to remain in the state which was found in the second week after ovulation, when the corpora lutea were full grown (2). Nayak and Zimmerman have presented limited electron microscopic studies of the porcine tubal epithelium during early pregnancy (3) . To the best of our knowledge, no electron microscopic studies of the porcine uterine tube epithelium during late and term pregnancy have been reported.

scholarly journals Beneficial effect of genistein on lowering blood pressure and kidney toxicity in fructose-fed hypertensive rats

2012 ◽  
Vol 109 (10) ◽  
pp. 1806-1812 ◽  
Author(s):  
Nallasamy Palanisamy ◽  
Anuradha C. Venkataraman
Keyword(s):  
Blood Pressure ◽  
Structural Changes ◽  
Ultrastructural Changes ◽  
Hypertensive Rats ◽  
Enos Expression ◽  
Electron Microscopic ◽  
Plasma Angiotensin ◽  
Enhanced Expression ◽  
Male Wistar Rats ◽  
Microscopic Studies

The study evaluates the effects of genistein on blood pressure (BP) and ultrastructural changes in kidney of fructose-fed hypertensive rats. Male Wistar rats were fed a diet containing 60 % starch or 60 % fructose as the source of carbohydrate. After 15 d, rats in each dietary group were divided into two groups and were treated with either genistein (1 mg/kg per d) in dimethylsulfoxide (DMSO) or 30 % DMSO alone. BP, pressor mechanisms, protein kinase C-βII (PKC-βII) expression, endothelial NO synthase (eNOS) expression and renal ultrastructural changes were evaluated after 60 d. Fructose-fed rats displayed significant elevation in BP and heart rate. Significant increase in plasma angiotensin-converting enzyme (ACE) activity, alterations in renal lipid profile, nitrite and kallikrein activity, enhanced expression of membrane-associated PKC-βII and decreased expression of eNOS were observed in them. Histology and electron microscopic studies showed structural changes in the kidney. Genistein administration lowered BP, restored ACE, PKC-βII and eNOS expression and preserved renal ultrastructural integrity. These findings demonstrate that genistein has effects on eNOS activity in renal cells, leading to eNOS activation and NO synthesis. These effects could have been mediated by activation of PKC-βII. The observed benefits of genistein make it a promising candidate for therapy of diabetic kidney disease.

Electron Microscopy of the Camel Oviductal Epithelium During Early Pregnancy

1977 ◽  
Vol 35 ◽  
pp. 660-661
Author(s):  
Ramesh K. Nayak ◽  
Anwar Zein
Keyword(s):  
Early Pregnancy ◽  
Structural Changes ◽  
Electron Microscopic ◽  
Reproductive Process ◽  
Transmission Electron ◽  
Transmission Electron Microscopic ◽  
Scanning Electron Microscopic ◽  
Oviductal Epithelium ◽  
Microscopic Features ◽  
Microscopic Studies

The function of the oviduct is essential to the reproductive process of mammals since it allows the meeting of gametes and the beginning of embryonic development. A detailed account on the fine structural changes of the porcine oviductal epithelium during pregnancy has been published. Scanning electron microscopic features of the oviduct from estrus camels have been recently described. To the best of our knowledge, no transmission electron microscopic studies of the camel oviductal epithelium during pregnancy have been reported. The purpose of this study was to identify some of the fine structural changes occurring in the tubal epithelium during early pregnancy and to establish a basis for subsequent physiological and pathological studies.Specimens from the infundibulum region of the oviduct were obtained from 10 pregnant camels. In the present study, it was not possible to determine the exact stage of pregnancy.

Correlative transmission and high-resolution scanning electron microscopic studies on pituitary cells

1990 ◽  
Vol 48 (3) ◽  
pp. 20-21
Author(s):  
S. Tai
Keyword(s):  
Cell Types ◽  
Depth Of Field ◽  
Secretory Cells ◽  
Specific Cell ◽  
Pituitary Cells ◽  
Electron Microscopic ◽  
3 Dimensional ◽  
Microscopic Studies ◽  
Structure And Activity ◽  
Intracellular Structure

Extensive cytological and histological research, correlated with physiological experimental analysis, have been done on the anterior pituitaries of many different vertebrates which have provided the knowledge to create the concept that specific cell types synthesize, store and release their specific hormones. These hormones are stored in or associated with granules. Nevertheless, there are still many doubts - that need further studies, specially on the ultrastructure and physiology of these endocrine cells during the process of synthesis, transport and secretion, whereas some new methods may provide the information about the intracellular structure and activity in detail.In the present work, ultrastructural study of the hormone-secretory cells of chicken pituitaries have been done by using TEM as well as HR-SEM, to correlate the informations obtained from 2-dimensional TEM micrography with the 3-dimensional SEM topographic images, which have a continous surface with larger depth of field that - offers the adventage to interpretate some intracellular structures which were not possible to see using TEM.

Effects of Combination Chemical Peel on Facial Photodamaged Skin

1998 ◽  
Vol 15 (3) ◽  
pp. 263-271 ◽  
Author(s):  
May H. El Samahy ◽  
Mohamed M. Ghoz ◽  
Naglaa Ramzy
Keyword(s):  
Glycolic Acid ◽  
Electron Microscopic Examination ◽  
Ultrastructural Changes ◽  
Elastic Fibers ◽  
Electron Microscopic ◽  
Trichloracetic Acid ◽  
Age Related ◽  
Photodamaged Skin ◽  
Microscopic Studies ◽  
Activated Fibroblasts

Introduction: Chemical peeling involves the topical application of a wounding agent with the goal of effecting an organized regeneration of the skin. The histologic and ultrastructural features of actinic and age-related damage include structural abnormalities that disrupt normal epidermal and dermal architecture. The purpose of the present study is to evaluate the clinical and histologic effects of an enhanced medium-depth peel on photodamaged skin. We aimed to correlate the clinical and histologic findings with the ultrastructural changes occurring after the peel. These ultrastructural features are supposed to be more precise and informative than the clinical or histological response. They may also be employed as markers of peel response. Materials and Methods: In the present study, five patients with actinically damaged skin underwent enhanced medium-depth peels using 70% glycolic acid and 35% trichloracetic acid. Biopsy specimens were taken before the peel and 3 months after the peel for histologic and electron microscopic examination. Results: Clinical resolution of actinic damage corresponded with restoration of epidermal polarity. Characteristic histologic and ultrastructural features of the skin after peeling include markedly decreased epidermal intracytoplasmic vacuoles, decreased elastic fibers, increased activated fibroblasts, and organized parallel arrays of collagen fibrils. The diameters of individual fibrils are consistent with recent production of collagen by activated fibroblasts. Conclusion: Glycolic acid—tricholoro-acetic acid (GA-TCA) is an effective combination for a medium-depth peel in photodamaged skin both clinically and histologically. Electron microscopic studies following medium-depth peels reveal changes more profound than those seen histologically. The characteristic changes occurring in the keratinocytes, collagen, and elastic fibrils may be considered as guidelines or markers of the peel response.

Ultrastructural Changes in Euglena After Ultraviolet Irradiation

1973 ◽  
Vol 13 (3) ◽  
pp. 799-809
Author(s):  
A. MICHAELS ◽  
A. GIBOR
Keyword(s):  
Ultraviolet Light ◽  
Ultraviolet Irradiation ◽  
Euglena Gracilis ◽  
Structural Changes ◽  
Ultrastructural Changes ◽  
Electron Microscopic ◽  
Bleaching Process ◽  
In Cells

The structural changes associated with the ultraviolet-induced bleaching of light-grown cells of Euglena gracilis were investigated. Our light- and electron-microscopic observations of the bleaching process indicate that there is a continuity of plastid structure in cells 5 generations after receiving a bleaching dose of ultraviolet light. There seems to be a continuous dilution of the plastid thylakoids and a decrease in plastid size in the bleaching cells. There also seems to be a change in the position of the plastids in relation to the mitochondria in the bleaching cells. The plastids and possibly the mitochondria are the only organelles which are affected by the ultraviolet irradiation. The continuity of plastids in bleaching cells of Euglena is discussed in relation to the proposed effect of the ultraviolet light.

Zymogen Secreting Cells in the Hepatopancreatic Duct of Pagurus Bernhardus (Linnaeus, 1758) and Clibanarius Longitarsus (De Haan, 1849) (Anomura)

Crustaceana ◽  
1995 ◽  
Vol 68 (5) ◽  
pp. 616-628
Author(s):  
C. Manjulatha ◽  
D. Erri Babu
Keyword(s):  
Connective Tissue ◽  
Secretory Activity ◽  
Secretory Cells ◽  
Main Duct ◽  
Zymogen Granules ◽  
Electron Microscopic ◽  
Food Material ◽  
Acidic Polysaccharide ◽  
Microscopic Studies ◽  
Pagurus Bernhardus

AbstractHistological and histochemical observations reveal that there are two clusters of acidic polysaccharide secreting glands at the opening of the mouth into the oesophagus in Pagurus bernhardus and Clibanarius longitarsus. Below these there are structurally similar glands in the connective tissue of the oesophagus. The epithelial cells lining the hepatopancreatic main duct show secretory activity and they secrete acidophilic granular secretions, which are chemically similar to vertebrate pancreatic zymogen granules. Electron microscopic studies reveal the presence of secretory cells in the hepatopancreatic duct and the synthesis of zymogens within these cells. The time of release of these granular secretions synchronizes with the release of the food material into the midgut.

scholarly journals The Morphological Assessment of Rats` Liver after the Introduction of the Nucleoside Reverse Transcriptase Inhibitor of Azidothymidine

2019 ◽  
pp. 61-67
Author(s):  
M. N. Kurbat ◽  
R. I. Kravchuk ◽  
O. B. Ostrovskaya
Keyword(s):  
Nucleoside Reverse Transcriptase Inhibitor ◽  
Structural Changes ◽  
Electron Microscopic Examination ◽  
Transcriptase Inhibitor ◽  
Ultrastructural Changes ◽  
Electron Microscopic ◽  
Structural And Functional Properties ◽  
Hepatotoxic Effect ◽  
Reverse Transcriptase Inhibitor ◽  
Morphological Assessment

Objective: to study the microscopic and ultrastructural changes in the liver of rats exposed to AZT. Material and methods. The histological and electron microscopic examination of the liver samples with mitochondrial morphometry has been performed. Results . The 7-day administration of AZT does not cause any significant structural changes in the liver. The exposure to the drug for 21 days leads to the development of moderate inflammatory and degenerative processes in the liver, including changes in the structure of hepatocyte mitochondria. Conclusion. One of the pathogenetic mechanisms of the hepatotoxic effect of AZT is its impact on the structural and functional properties of hepatocyte mitochondria.

An Electron Microscopic Study of the Human Gastric Epithelia with Special Reference to the Cardinal Morphological Changes of the Chief Cells Induced by Insulin Stimulus

1972 ◽  
Vol 30 ◽  
pp. 344-345
Author(s):  
Hiroshi Saito ◽  
Goro Asano ◽  
Kaoru Aihara ◽  
Katsunari Fukushi ◽  
Minoru Yoshida ◽  
...  
Keyword(s):  
Endoplasmic Reticulum ◽  
Morphological Changes ◽  
Regular Insulin ◽  
Endoscopic Biopsy ◽  
Granular Endoplasmic Reticulum ◽  
Ultrastructural Changes ◽  
Electron Microscopic ◽  
Chief Cells ◽  
Microscopic Studies ◽  
The One

This short communication is dealt with the ultrastructural changes of the chief cells in insulin stimulus in chronic gastritic condition. The bio gastro-endoscopic biopsy was obtained and pepsin activity of the gastric juice was measured in respective cases. Regular insulin of 0.15U/kg was administrated intra-muscularly and in pre-administration of insulin, 10 minutes, 20 minutes and 30 minutes after administration, biopsied specimens were subjected for electron microscopic studies.In the pre-treated chief cells, extensive development of the cysternal structures of the granular endoplasmic reticulum in basal aspect of the cytoplasm and spherical or oval shaped, light homogeneous zymogen granules in supranuclear region and especially apical aspect of the cytoplasm were featured. Moreover, other type of the chief cells as the one characterized by their fragmented and saccular dilated granular endoplasmic reticulum in basal aspect of the cytoplasm, also exist.

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