Abstract:
:The midgut cells of Tomocerus minor (Insecta, Collembola) were examined with the electron microscope and cytochemically. The midgut epithelium consists of a series of cells characterised by numerous mineral concretions scattered throughout the cytoplasm. Mitochondria are abundant; microvilli are well developed at the apical surface of the cell. A zonula continua (continuous junction) characterises the apical contact region of these cells. Polysaccharides, glycoproteins and carbohydrate components have been demonstrated on the surface of microvilli. Peritrophic membranes surround the food bolus and preserve midgut cells from mechanical abrasion. Lysosomes are present during the alimentary period and show strong acid phosphatase activity. During an intermoulting cycle, two stages can be observed: (1) the postexuvial feeding period during which cytoplasmic extrusions appear at the apical part of the cell: lysosomes increase in number and autophagic vacuoles appear. (2) The preexuvial fasting period; a new epithelium grows beneath the old one and pushes it into the lumen. Degeneration processes can be observed in the old epithelium. This excretory reactivity of the midgut epithelium has been compared to the cycle of the cuticle.
journal_name
Cell Tissue Resjournal_title
Cell and tissue researchauthors
Humbert Wdoi
10.1007/BF00236347subject
Has Abstractpub_date
1979-01-30 00:00:00pages
39-57issue
1eissn
0302-766Xissn
1432-0878journal_volume
196pub_type
杂志文章abstract::The comparatively simple Caenorhabditis elegans intestine fulfills many of the complex functions of the mammalian digestive tract, liver, and fat tissues, while also having roles in pathogen defense, immunity, and longevity. In this review, we describe the structure of the C. elegans gut and how it develops from the e...
journal_title:Cell and tissue research
pub_type: 杂志文章,评审
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journal_title:Cell and tissue research
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journal_title:Cell and tissue research
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journal_title:Cell and tissue research
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doi:10.1007/s00441-006-0219-z
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journal_title:Cell and tissue research
pub_type: 杂志文章,评审
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journal_title:Cell and tissue research
pub_type: 杂志文章,评审
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journal_title:Cell and tissue research
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journal_title:Cell and tissue research
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journal_title:Cell and tissue research
pub_type: 杂志文章
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更新日期:2000-10-01 00:00:00
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journal_title:Cell and tissue research
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更新日期:2008-10-01 00:00:00
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journal_title:Cell and tissue research
pub_type: 杂志文章
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更新日期:2013-07-01 00:00:00
abstract::Tactile hairs on the locust thorax can be divided into two classes by their external morphology and their central projection pattern: Short hairs, 10--100 micrometer in length, which are assembled in distinct plates and rows, and long hairs, 100--800 micrometer in length, which are distributed all over the body and ar...
journal_title:Cell and tissue research
pub_type: 杂志文章
doi:10.1007/BF00234546
更新日期:1981-01-01 00:00:00
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journal_title:Cell and tissue research
pub_type: 杂志文章
doi:10.1007/BF00215516
更新日期:1987-08-01 00:00:00
abstract::Light microscopy of native preparations, histology, and electron microscopy have revealed that Phlebotomus duboscqi belongs to a class of sand fly species with prompt development of the peritrophic matrix (PM). Secretion of electron-lucent fibrils, presumably chitin, starts immediately after the ingestion of a blood m...
journal_title:Cell and tissue research
pub_type: 杂志文章
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更新日期:2009-08-01 00:00:00
abstract::Fragments of pituitary tissue obtained from a total of 37 patients with either breast cancer, diabetic retinopathy, galactorrhea, or acromegaly were dissociated into single cell suspensions prior to cell culture. Release of human growth hormone (hGH) and human prolactin (hPRL) into the culture medium was measured by r...
journal_title:Cell and tissue research
pub_type: 杂志文章
doi:10.1007/BF00219803
更新日期:1978-08-16 00:00:00
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journal_title:Cell and tissue research
pub_type: 杂志文章
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更新日期:1993-06-01 00:00:00
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journal_title:Cell and tissue research
pub_type: 杂志文章
doi:10.1007/BF00214368
更新日期:1988-05-01 00:00:00
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journal_title:Cell and tissue research
pub_type: 杂志文章
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journal_title:Cell and tissue research
pub_type: 杂志文章
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更新日期:1987-12-01 00:00:00
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journal_title:Cell and tissue research
pub_type: 杂志文章
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journal_title:Cell and tissue research
pub_type: 杂志文章
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更新日期:1978-02-24 00:00:00
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journal_title:Cell and tissue research
pub_type: 杂志文章
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journal_title:Cell and tissue research
pub_type: 杂志文章
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更新日期:1975-01-01 00:00:00
abstract::For the study of the hypothalamo-hypophysial system of Xenopus laevis tadpoles, hypothalamic lesions were made by means of the electrocoagulation technique. Lesioning of the ventral region of the preoptic nucleus resulted in a decrease of the number of ACTH cells in the pars distalis of the pituitary gland and in a di...
journal_title:Cell and tissue research
pub_type: 杂志文章
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更新日期:1976-06-11 00:00:00
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journal_title:Cell and tissue research
pub_type: 杂志文章
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更新日期:1984-01-01 00:00:00
abstract::Protein kinase C (PKC) is overexpressed in cancer, including pancreatic cancer, compared with normal tissue. Moreover, PKCα is considered one of the biomarkers for the diagnosis of cancers. In several human cancers, the claudin tight junction molecules are abnormally regulated and are thus promising molecular targets ...
journal_title:Cell and tissue research
pub_type: 杂志文章
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更新日期:2011-12-01 00:00:00
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journal_title:Cell and tissue research
pub_type: 杂志文章
doi:10.1007/s00441-007-0498-z
更新日期:2007-12-01 00:00:00
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journal_title:Cell and tissue research
pub_type: 杂志文章
doi:10.1007/s004410050551
更新日期:1996-03-01 00:00:00
abstract::Fibroblast growth factors (Fgfs) are proteins with diverse functions in development, repair, and metabolism. The human Fgf gene family with 22 members can be classified into three groups, canonical, intracellular, and hormone-like Fgf genes. In contrast to canonical and intracellular Fgfs identified in invertebrates a...
journal_title:Cell and tissue research
pub_type: 杂志文章,评审
doi:10.1007/s00441-010-1024-2
更新日期:2010-10-01 00:00:00
abstract::Colorectal adenocarcinomas were induced in male Wistar rats, by weekly subcutaneous administration of 1,2-dimethylhydrazine, classified according to the degree of differentiation and submitted to immunocytochemistry for the peptides cholecystokinin (CCK), gastrin, gastric inhibitory polypeptide (GIP), glucagon, neurot...
journal_title:Cell and tissue research
pub_type: 杂志文章
doi:10.1007/BF00219019
更新日期:1986-01-01 00:00:00