Métamorphose de l'intestin antérieur et de l'intestin moyen chez Tenebrio molitor L. (Insecte, Coléoptère)

1987 ◽  
Vol 65 (8) ◽  
pp. 1923-1934 ◽  
Author(s):  
Y. Tano ◽  
J. François ◽  
C. Noirot-Timothée
Keyword(s):  
Basal Lamina ◽  
Tenebrio Molitor ◽  
Male And Female ◽  
Characteristic Features ◽  
Imaginal Differentiation

The foregut and midgut of male and female Tenebrio molitor were studied just before and during metamorphosis. Three successive stages can be recognized by characteristic features of the cuticle and epithelium of the foregut, and of the peritrophic sheath, epithelium, basal lamina, and muscular connective sheath of the midgut. In the external integument, changes occur during two periods, implying two reprogramming phases. Overall, periods of change for the gut are concomitant with first the pupal molt and then the imaginal molt. However, in the foregut, cuticular secretion begins later than in the integument and is completed at the time of ecdysis. For the midgut, imaginal differentiation is slow and ends a few days after ecdysis.

Changes induced by Hymenolepis diminuta (Cestoda) in the behaviour of the intermediate host Tenebrio molitor (Coleoptera)

1991 ◽  
Vol 69 (9) ◽  
pp. 2291-2294 ◽  
Author(s):  
Hilary Hurd ◽  
Sharon Fogo
Keyword(s):  
Intermediate Host ◽  
Aggregation Pheromone ◽  
Tenebrio Molitor ◽  
Significant Loss ◽  
Hymenolepis Diminuta ◽  
Male And Female ◽  
Behavioural Changes ◽  
Loss Of Response ◽  
Host Behaviour ◽  
Dose Dependent

Metacestodes of the rat tapeworm, Hymenolepis diminuta, have been shown to induce behavioural changes in the intermediate host Tenebrio molitor (Coleoptera). Male and female beetles, examined 11–12 days postinfection, were shown to exhibit a significant decrease in activity and photophobic behaviour. In addition, a significant loss of response to aggregation pheromone occurred in both sexes. No differences in host behaviour were detected 4–5 days postinfection. It thus appears that behavioural changes are associated with parasite maturity. We were unable to demonstrate a dose-dependent loss of photophobic behaviour.

scholarly journals Social Profile of Gulag Prisoners - Authors of Memoirs

2021 ◽  
pp. 49-68
Author(s):  
Ekaterina Mikhailovna Goretskaia
Keyword(s):  
Electronic Resource ◽  
Biographical Data ◽  
Male And Female ◽  
Biographical Information ◽  
Female Prisoners ◽  
Soviet State ◽  
The Social ◽  
Males And Females ◽  
Characteristic Features

Political repressions affected representatives of all social strata and groups. This period left a bulk of documents, including memoirs, where the most intimate and difficult thoughts and recollections of their authors are reflected. One of valuable sets of memoirs of political repressions history is collected by the Sakharov Center website. The electronic resource "Memories of the Gulag and their authors" is valuable not only because it exhibits memoirs of more than one and a half thousand people who suffered from repressions but also because of the biographical information about the authors of these memoirs compiled on the basis of information from the memoirs. Biographical data on the victims of the Gulag system became the main source of this study. They allow us to describe and analyze the social portrait of Gulag victims who left memories. Biographical data became a source for creating the database "Gulag prisoners-authors of memoirs". The social portrait of the repressed and its characteristic features were described, as well as a comparison of the social portrait of male and female prisoners was made. Males and females were analyzed separately to pursue the goal set. The analysis suggests that there is a certain similarity of biographical characteristics among the authors of the memoirs which is probably due to the fact that the educated, intelligent segments of the population were one of the objects of a purposeful repressive policy followed in the Soviet state. .

Effects of male and female scent on reproductive maturation in young female Tenebrio molitor

1970 ◽  
Vol 16 (8) ◽  
pp. 1543-1548 ◽  
Author(s):  
George M. Happ ◽  
Mark E. Schroeder ◽  
James C.H. Wang
Keyword(s):  
Tenebrio Molitor ◽  
Young Female ◽  
Male And Female ◽  
Reproductive Maturation

The Clinical, Roentgenological and Morphological Effects of an Acute Exposure of Phosgene on the Lungs of Dogs

1971 ◽  
Vol 29 ◽  
pp. 236-237
Author(s):  
R. F. Bils ◽  
W. F. Diller ◽  
F. Huth
Keyword(s):  
Latent Period ◽  
Chemical Industry ◽  
Toxic Substance ◽  
Lung Edema ◽  
X Rays ◽  
Beagle Dogs ◽  
Male And Female ◽  
Morphological Alterations ◽  
Before And After ◽  
Electron Microscopes

Phosgene still plays an important role as a toxic substance in the chemical industry. Thiess (1968) recently reported observations on numerous cases of phosgene poisoning. A serious difficulty in the clinical handling of phosgene poisoning cases is a relatively long latent period, up to 12 hours, with no obvious signs of severity. At about 12 hours heavy lung edema appears suddenly, however changes can be seen in routine X-rays taken after only a few hours' exposure (Diller et al., 1969). This study was undertaken to correlate these early changes seen by the roengenologist with morphological alterations in the lungs seen in the'light and electron microscopes.Forty-two adult male and female Beagle dogs were selected for these exposure experiments. Treated animals were exposed to 94.5-107-5 ppm phosgene for 10 min. in a 15 m3 chamber. Roentgenograms were made of the thorax of each animal before and after exposure, up to 24 hrs.

Induction and Differentiation of Dental Epithelium in Vivo and in Vitro

1982 ◽  
Vol 40 ◽  
pp. 142-145
Author(s):  
E. J. Kollar
Keyword(s):  
Connective Tissue ◽  
Oral Mucosa ◽  
Basal Lamina ◽  
Functional Derivatives ◽  
Specific Source ◽  
Dental Epithelium ◽  
Connective Tissue Stroma

The differentiation and maintenance of many specialized epithelial structures are dependent on the underlying connective tissue stroma and on an intact basal lamina. These requirements are especially stringent in the development and maintenance of the skin and oral mucosa. The keratinization patterns of thin or thick cornified layers as well as the appearance of specialized functional derivatives such as hair and teeth can be correlated with the specific source of stroma which supports these differentiated expressions.

Ultrastructural investigation of spontaneous pituitary gonadotroph cell adenomas in aging Sprague-Dawley rats

1983 ◽  
Vol 41 ◽  
pp. 702-703
Author(s):  
D. J. McComb ◽  
J. Beri ◽  
F. Zak ◽  
K. Kovacs
Keyword(s):  
Electron Microscopy ◽  
Animal Model ◽  
Epoxy Resin ◽  
Immunoelectron Microscopy ◽  
Tumor Type ◽  
Gonadal Function ◽  
Sprague Dawley ◽  
Male And Female ◽  
Reticulin Fibers ◽  
Sprague Dawley Rats

Gonadotroph cell adenomas of the pituitary are infrequent in human patients and are not invariably associated with altered gonadal function. To date, no animal model of this tumor type exists. Herein, we describe spontaneous gonadotroph cell adenomas in old male and female Sprague-Dawley rats by histology, immunocytology and electron microscopy.The material consisted of the pituitaries of 27 male and 38 female Sprague Dawley rats, all 26 months of age or older, removed at routine autopsy. Sections of formal in-fixed, paraffin-embedded tissue were stained with hematoxylin-phloxine-saffron (HPS), the PAS method and the Gordon-Sweet technique for the demonstration of reticulin fibers. For immunostaining, sections were exposed to anti-rat β-LH, anti-ratβ-TSH, anti-rat PRL, anti-rat GH and anti-rat ACTH 1-39. For electron microscopy, tissue was fixed in 2.5% glutaraldehyde, postfixed in 1% OsO4 and embedded in epoxy-resin. Tissue fixed in 10% formalin, embedded in epoxy resin without osmification, was used for immunoelectron microscopy.

Ultrastructural modification of cellular interactions in cancer tumor

1978 ◽  
Vol 36 (2) ◽  
pp. 318-319
Author(s):  
N. P. Dmitrieva
Keyword(s):  
Cancer Cells ◽  
Human Thyroid ◽  
Adjacent Cell ◽  
Main Role ◽  
Cellular Interactions ◽  
Electron Microscopic ◽  
Cancer Tumor ◽  
Normal Human ◽  
Characteristic Features

One of the most characteristic features of cancer cells is their ability to metastasia. It is suggested that the modifications of the structure and properties of cancer cells surfaces play the main role in this process. The present work was aimed at finding out what ultrastructural features apear in tumor in vivo which removal of individual cancer cells from the cell population can provide. For this purpose the cellular interactions in the normal human thyroid and cancer tumor of this gland electron microscopic were studied. The tissues were fixed in osmium tetroxide and were embedded in Araldite-Epon.In normal human thyroid the most common type of intercellular contacts was represented by simple junction formed by the parallelalignment of adjacent cell membranees leaving in between an intermembranes space 15-20 nm filled with electronlucid material (Fig. 1a). Sometimes in the basal part of cells dilatations of the intercellular space 40-50 nm wide were found (Fig. 1a). Here the cell surfaces may form single short microvilli.

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