Abstract：
:In contrast to the vitellolysis zone which is involved in the degradation of the yolk, the cytoplasmic zone of the yolk syncytial layer, composed of many cytoplasmic organelles, is implicated in a secretory process. The granular endoplasmic reticulum of the latter is extremely well developed and organized into trabeculae. The yolk nuclei show a RNA positive reaction. The Golgi apparatus is implicated in the elaboration of very low density lipoproteins (VLDL) and of acid phosphatase. The numerous mitochondria seem to suggest an important energy metabolism in the solubilisation area. The appearance of certain special structures (crystalline bodies, pseudovesicular structures, lipochondria) as well as their relation with the organelles of the cytoplasmic zone, re-inforces the impression of a layer with a secretory nature and suggests its participation in the remodelling of the yolk products produced in the vitellolysis zone. The results of the investigations concerning the acid phosphatase activity suggest that this enzyme plays a role on the one hand in the degradation of certain platelets which penetrate into the cytoplasmic zone, and on the other hand in the regulation of VLDL, in the lysis of secretory products elaborated by the cytoplasmic zone. The possible presence of microperoxisomes is discussed as well as the positive detection of glucose-6-phosphate dehydrogenase.
journal_name
Cell Tissue Resjournal_title
Cell and tissue researchauthors
Walzer C,Schönenberger Ndoi
10.1007/BF00236349subject
Has Abstractpub_date
1979-01-30 00:00:00pages
75-93issue
1eissn
0302-766Xissn
1432-0878journal_volume
196pub_type
杂志文章abstract：:Captopril [1-(D-3-mercapto-2-methyl-1-oxopropyl)-L-proline (S,S)] is now known to be an inhibitor of angiotensin-converting enzyme. In male mice, the juxtaglomerular cells were examined by electron microscopy 42 h after administration of captopril. Numerous dense granules appeared in the rough endoplasmic reticulum of...
journal_title：Cell and tissue research
pub_type： 杂志文章
doi：10.1007/BF00209980
更新日期：1981-01-01 00:00:00
abstract：:Colonies of the ascidian Botryllus schlosseri undergo recurrent generation changes in which adult zooids are gradually resorbed and replaced by new blastogenic generations. During these periods, known as take-over phases, programmed cell death, which, on the basis of morphological analysis is ascribed to apoptosis, oc...
journal_title：Cell and tissue research
pub_type： 杂志文章
doi：10.1007/s00441-003-0738-9
更新日期：2003-06-01 00:00:00
abstract：:Neurons displaying FMRFamide(Phe - Met - Arg - Phe - NH2)-like immunoreactivity have recently been implicated in neural plasticity in salmon. We now extend these findings by describing the extent of the FMRF-like immunoreactive (FMRF-IR) system in the brain, retina and olfactory system of sockeye salmon parr using the...
journal_title：Cell and tissue research
pub_type： 杂志文章
doi：10.1007/BF00313518
更新日期：1990-09-01 00:00:00
abstract：:Neurons are extremely polarised cells in which the cytoskeleton, composed of microtubules, microfilaments and neurofilaments, plays a crucial role in maintaining structure and function. Neurofilaments, the 10-nm intermediate filaments of neurons, provide structure and mechanoresistance but also provide a scaffolding f...
journal_title：Cell and tissue research
pub_type： 杂志文章,评审
doi：10.1007/s00441-014-2082-7
更新日期：2015-06-01 00:00:00
abstract：:The medial preoptic nucleus of the Japanese quail is a testosterone-sensitive structure that is involved in the control of male copulatory behavior. The full understanding of the role played by this nucleus in the control of reproduction requires the identification of its afferent and efferent connections. In order to...
journal_title：Cell and tissue research
pub_type： 杂志文章
doi：10.1007/BF00343944
更新日期：1994-06-01 00:00:00
abstract：:Post-translational modification of histone proteins, such as the methylation of lysine and arginine residues, influences the higher order of chromatin and leads to gene activation or silencing. Histone methyltransferases or demethylases actively add or remove various methylation marks in a cell-type-specific and conte...
journal_title：Cell and tissue research
pub_type： 杂志文章,评审
doi：10.1007/s00441-014-1842-8
更新日期：2014-06-01 00:00:00
abstract：:The amygdala is a central hub for fear learning assessed by Pavlovian fear conditioning. Indeed, the prevailing hypothesis that learning and memory are mediated by changes in synaptic strength was shown most convincingly at thalamic and cortical afferents to the lateral amygdala. The neurotrophin brain-derived neurotr...
journal_title：Cell and tissue research
pub_type： 杂志文章,评审
doi：10.1007/s00441-020-03260-3
更新日期：2020-10-01 00:00:00
abstract：:Iron loading of hepatocytes was followed through the stages (1-7) of metamorphosis in lamprey (Petromyzon marinus L.) using light- and electron-microscopic histochemistry. Iron is present in ferric and ferrous forms in the hepatocytes of larval lampreys in levels that can only be detected in the electron microscope. D...
journal_title：Cell and tissue research
pub_type： 杂志文章
doi：10.1007/BF00217405
更新日期：1983-01-01 00:00:00
abstract：:Cestodes (tapeworms) are a derived, parasitic clade of the phylum Platyhelminthes (flatworms). The cestode body wall represents an adaptation to its endoparasitic lifestyle. The epidermis forms a non-ciliated syncytium, and both muscular and nervous system are reduced. Morphological differences between cestodes and fr...
journal_title：Cell and tissue research
pub_type： 杂志文章
doi：10.1007/s00441-002-0687-8
更新日期：2003-03-01 00:00:00
abstract：:High-density cultures are widely used as an in vitro model for studies of embryonic cartilage formation. In the present study we investigated the suitability of high-density cultures for the redifferentiation of dedifferentiated chondrocytes. When primary human chondrocytes were cultured in alginate beads, some cells ...
journal_title：Cell and tissue research
pub_type： 杂志文章
doi：10.1007/s00441-002-0562-7
更新日期：2002-06-01 00:00:00
abstract：:Neurons projecting from the brain to the pineal gland via the pineal stalk were investigated in the golden hamster with the use of the retrograde horseradish-peroxidase tracing method both in vivo and in vitro. Labelled perikarya were observed in the medial and lateral habenular nuclei as well as in the posterior comm...
journal_title：Cell and tissue research
pub_type： 杂志文章
doi：10.1007/BF00216557
更新日期：1987-01-01 00:00:00
abstract：:Electron microscopy of the rat lymph node disclosed reticular cells in close association with bundles of collagenous fibrils 30-45 nm in diameter, and electron lucent "amorphous" substances surrounded by microfibrils 11 nm in diameter, with junctional complexes. The amorphous substances, distinctly revealed by orcein ...
journal_title：Cell and tissue research
pub_type： 杂志文章
doi：10.1007/BF00210522
更新日期：1981-01-01 00:00:00
abstract：:By means of a preembedding immuno-electron-microscopic technique, a large number of nerve endings containing a substance related to human growth hormone-releasing factor (hGRF) have been demonstrated in the paraventricular nucleus of the guinea pig. They made synaptic contacts primarily with dendritic shafts: 80% of t...
journal_title：Cell and tissue research
pub_type： 杂志文章
doi：10.1007/BF01239984
更新日期：1987-04-01 00:00:00
abstract：:The excretory system of Macrobiotus richtersi consists of one dorsal and two lateral components and shows a high degree of structural complexity. In each of these a tricellular external lobe and a column can be distinguished, the two parts being connected distally. The surface of the lobe cells is increased by deep ba...
journal_title：Cell and tissue research
pub_type： 杂志文章
doi：10.1007/BF00239339
更新日期：1980-01-01 00:00:00
abstract：:Stereological studies showed that treatment of normal adult human adrenocortical cells in primary culture with ACTH or cyclic-AMP for 2 days results in similar increases in the volume of cells, of the mitochondrial and "membrane space" compartments and of the surface area of the smooth endoplasmic reticulum and mitoch...
journal_title：Cell and tissue research
pub_type： 杂志文章
doi：10.1007/BF00218169
更新日期：1978-07-05 00:00:00
abstract：:The enteric nervous system (ENS) controls gastrointestinal functions. In large mammals' intestine, it comprises an inner (ISP) and outer (OSP) submucous plexus and a myenteric plexus (MP). This study quantifies enteric neurons in the ISP, OSP, and MP of the pig ascending (AC) and descending colon (DC) using the HuC/D,...
journal_title：Cell and tissue research
pub_type： 杂志文章
doi：10.1007/s00441-020-03286-7
更新日期：2020-09-23 00:00:00
abstract：:The chemical composition of intermediate filaments (IF's) in the ependyma of the subcommissural organ (SCO) of the Mongolian gerbil (Meriones unguiculatus) was investigated immunohistochemically in paraffin-embedded tissue. Antibodies against glial fibrillary acidic protein (GFAP), vimentin, neurofilament proteins and...
journal_title：Cell and tissue research
pub_type： 杂志文章
doi：10.1007/BF00218796
更新日期：1989-03-01 00:00:00
abstract：:The distributions within the coeliac ganglion of different chemically coded subgroups of noradrenaline neurons, and the relationships between these neurons and nerve fibres projecting to the ganglion from the intestine, have been assessed quantitatively by use of an immunohistochemical double-staining method. Noradren...
journal_title：Cell and tissue research
pub_type： 杂志文章
doi：10.1007/BF00218395
更新日期：1986-01-01 00:00:00
abstract：:Vasodilator-stimulated phosphoprotein (VASP) and mammalian-enabled protein (MENA) share similar cellular localisation and functions (signal transduction pathways, regulation of actin cytoskeleton dynamics). Functional substitution and compensation among Ena/VASP proteins have been proposed as the reason for the absenc...
journal_title：Cell and tissue research
pub_type： 杂志文章
doi：10.1007/s00441-004-0964-9
更新日期：2004-12-01 00:00:00
abstract：:The distribution of gap junctions (nexuses) in various parts of the small and large intestines of the guinea-pig was studied using the freeze-fracture technique and in thin sections. The percentage area of smooth muscle cell surface occupied by gap junctions varies from 0.50% in the circular muscle of the duodenum to ...
journal_title：Cell and tissue research
pub_type： 杂志文章
doi：10.1007/BF00209987
更新日期：1981-01-01 00:00:00
abstract：:Carotid bodies of ducks show no detectable changes in ultrastructure up to periods of four weeks following the removal of 2-3 cm of the cervical vagus (decentralization). This indicates that the majority, and possibily all the nerves terminating on the glomus cells are afferent (sensory) in nature. These nerve endings...
journal_title：Cell and tissue research
pub_type： 杂志文章
doi：10.1007/BF00218494
更新日期：1975-11-19 00:00:00
abstract：:The ultrastructure of crystalline beta granules of the islets of Langerhans in the alligator has been investigated. From optical diffraction analysis and serial sectioning, the existence of four distinct types of crystalline inclusions was established in ultrathin sections. The first type is the most frequent and is i...
journal_title：Cell and tissue research
pub_type： 杂志文章
doi：10.1007/BF00229618
更新日期：1978-03-13 00:00:00
abstract：:Enterochromaffin (EC) cells regulate gut motility and secretion in response to luminal stimuli, via the release of serotonin (5-HT). Inflammatory bowel disease and other gastrointestinal disorders are associated with increased numbers of EC cells and 5-HT availability. Our aim was to determine whether proliferation of...
journal_title：Cell and tissue research
pub_type： 杂志文章
doi：10.1007/s00441-007-0430-6
更新日期：2007-09-01 00:00:00
abstract：:Exposure of adult brown bullheads Ictalurus nebulosus (120-450 g) to environmental hypercapnia (2% carbon dioxide in air) and subsequent recovery caused transient changes in whole body net sodium flux (JnetNa+) and net chloride flux (JnetCl-) resulting largely from changes in whole body sodium influx (JNa+in) and chlo...
journal_title：Cell and tissue research
pub_type： 杂志文章
doi：10.1007/BF00319161
更新日期：1992-06-01 00:00:00
abstract：:It has long been disputed whether mammalian enterochromaffin (EC-) cells contain a peptide in addition to serotonin. Previous immunohistochemical studies have provided evidence for the presence of enkephalins in EC-cells. These findings, however, are equivocal. Therefore, the problem of opioid peptides in EC-cells has...
journal_title：Cell and tissue research
pub_type： 杂志文章
doi：10.1007/BF00221752
更新日期：1988-07-01 00:00:00
abstract：:Luteinizing hormones-releasing hormone (LHRH), vasopressin, and corticotropin systems were examined by immunocytochemical methods in male rats 2 to 20 days after deafferentation of the basal hypothalamus. Axonal degeneration of the vasopressin system (whose perikarya lie rostral to the island) and the corticotropin sy...
journal_title：Cell and tissue research
pub_type： 杂志文章
doi：10.1007/BF00210157
更新日期：1981-01-01 00:00:00
abstract：:Pax genes are expressed in specific patterns in the nervous system during development and in the adult. Recent findings suggest a link between the expression of Pax-2 and axonal guidance. Mice with a targeted deletion of Pax-2 are an excellent tool for studying axonal pathfinding at the molecular level, especially wit...
journal_title：Cell and tissue research
pub_type： 杂志文章,评审
doi：10.1007/s004410050923
更新日期：1997-11-01 00:00:00
abstract：:In Syrian hamsters (Mesocricetus auratus), oxytocin (OXT) activity within the medial preoptic-anterior hypothalamus (MPOA-AH) and the ventromedial hypothalamus (VMH) plays an important role in the expression of sexual receptivity. Immunocytochemical analysis with OXT-specific antibodies was used to identify the distri...
journal_title：Cell and tissue research
pub_type： 杂志文章
doi：10.1007/s004410050993
更新日期：1998-02-01 00:00:00
abstract：:Three types of sensilla occurring on the lips and on the antennae of Peripatopsis moseleyi have been investigated by scanning and transmission electron microscopy. On the lips sensory spines can be found which contain numerous cilia originating from bipolar receptor cells. They reach the tip of the spine where the cut...
journal_title：Cell and tissue research
pub_type： 杂志文章
doi：10.1007/BF00220613
更新日期：1977-02-14 00:00:00
abstract：:With an indirect immunofluorescence technique and an antiserum raised against synthetic LHRH, immunofluorescent granules were observed in fine radially oriented fibres in the palisade layer of the zoma externa in both the anterior and the posterior divisions of the median eminence in the greenfinch. There was no speci...
journal_title：Cell and tissue research
pub_type： 杂志文章
doi：10.1007/BF00223264
更新日期：1975-09-16 00:00:00
