Abstract:
:The periostracum in Unionidae consists of two layers. The outer one is secreted within the periostracal groove, while the inner layer is secreted by the epithelium of the outer mantle fold. The periostracum reaches its maximum thickness at the shell edge, where it reflects onto the shell surface. Biomineralization begins within the inner periostracum as fibrous spheruliths, which grow towards the shell interior, coalesce and compete mutually, originating the aragonitic outer prismatic shell layer. Prisms are fibrous polycrystalline aggregates. Internal growth lines indicate that their growth front is limited by the mantle surface. Transition to nacre is gradual. The first nacreous tablets grow by epitaxy onto the distal ends of prism fibres. Later growth proceeds onto previously deposited tablets. Our model involves two alternative stages. During active shell secretion, the mantle edge extends to fill the extrapallial space and the periostracal conveyor belt switches on, with the consequential secretion of periostracum and shell. During periods of inactivity, only the outer periostracum is secreted; this forms folds at the exit of the periostracal groove, leaving high-rank growth lines. Layers of inner periostracum are added occasionally to the shell interior during prolonged periods of inactivity in which the mantle is retracted.
journal_name
Tissue Celljournal_title
Tissue & cellauthors
Checa Adoi
10.1054/tice.2000.0129subject
Has Abstractpub_date
2000-10-01 00:00:00pages
405-16issue
5eissn
0040-8166issn
1532-3072pii
S0040-8166(00)90129-0journal_volume
32pub_type
杂志文章相关文献
TISSUE & CELL文献大全abstract::To develop means of measuring angiotensin converting enzyme of endothelial cells in culture, we have synthesized benzoyl-Phe-Ala-Pro-OH (I), benzoyl-Pro-Phe-Arg-OH (II) and benzoyl-Gly-His-Leu-OH (III), each bearing a 3H-atom on the para-position of its benzoyl moiety. All three of the acylated tripeptides are substra...
journal_title:Tissue & cell
pub_type: 杂志文章
doi:10.1016/s0040-8166(16)30348-2
更新日期:1978-01-01 00:00:00
abstract::In the adult male rat, hemicastration (HC) induces a remarkable enhancement of testosterone secretion from the Leydig cells of the remaining testis. We have observed previously that the denervation of inferior spermatic nerves inhibits this enhancement. The present experiments were designed to assess morphometrically ...
journal_title:Tissue & cell
pub_type: 杂志文章
doi:10.1016/s0040-8166(98)80027-x
更新日期:1998-10-01 00:00:00
abstract::Glossina austeni oogenesis throughout its nine-day pregnancy cycle is described with the focus on previtellogenic stages. The ultrastructural details of the oocyte-nurse cell relationship and cyst formation is presented. The oocyte develops in a syncytial association with 15 nurse cells with the entire unit surrounded...
journal_title:Tissue & cell
pub_type: 杂志文章
doi:10.1016/0040-8166(75)90007-5
更新日期:1975-01-01 00:00:00
abstract::The normal cobblestone monolayer architecture of cultured vascular endothelium becomes rapidly disorganized after contact of the cell layer with a fibrin clot. The cells of a confluent endothelial monolayer separate into individual migratory cells in 4--6 hr after contact with fibrin. The effect is reversible in that ...
journal_title:Tissue & cell
pub_type: 杂志文章
doi:10.1016/0040-8166(79)90010-7
更新日期:1979-01-01 00:00:00
abstract::Nuclei in the giant polyploid silk gland cells of Calpodes ethlius grow by endomitosis and can develop hundreds of branches during larval life. The shape of the these nuclei is characteristic for each region of the gland. We have found shape to be correlated with arrangement of the nuclear matrix. Scanning electron mi...
journal_title:Tissue & cell
pub_type: 杂志文章
doi:10.1016/0040-8166(91)90036-s
更新日期:1991-01-01 00:00:00
abstract::Examination of livers from transgenic mice over expressing human growth hormone (hGH) revealed numerous alterations including a striking incidence of mitotic figures. The reason for increased proliferation is unclear, but could be related to effects of hGH, which is also acting as a lactogen in rodents. In order to id...
journal_title:Tissue & cell
pub_type: 杂志文章
doi:10.1016/0040-8166(94)90029-9
更新日期:1994-06-01 00:00:00
abstract::Fluorescent staining of Rhodnius prolixus ovarioles with rhodaminylphalloidin revealed an elaborate interconnecting meshwork of F-actin encasing the microtubule rich core. The thick actin struts have branches extending partially into the nurse cell lobes extending from the syncytical core. Basally the network ends at ...
journal_title:Tissue & cell
pub_type: 杂志文章
doi:10.1016/0040-8166(86)90075-3
更新日期:1986-01-01 00:00:00
abstract::The detailed structure of the cockroach spermatheca is described and discussed firstly as an example of an insect integumentary gland, and secondly, from the standpoint of its role in reproduction. The gland comprises a cortical rank of separate secretory units, each associated with an epithelial duct cell responsible...
journal_title:Tissue & cell
pub_type: 杂志文章
doi:10.1016/s0040-8166(69)80027-3
更新日期:1969-01-01 00:00:00
abstract::Spermatogenesis and the sperm structure of the terebrantian Aeolothrips intermedius Bagnall are described. Spermatogenesis consists of two mitotic divisions; the second is characterized by the loss of half of the spermatids, which have pyknotic nuclei. Early spermatids have two centrioles, but when spermiogenesis star...
journal_title:Tissue & cell
pub_type: 杂志文章
doi:10.1016/j.tice.2010.04.008
更新日期:2010-08-01 00:00:00
abstract::The guppy is a tropical fish that has been used as an experimental model organism in science. It is a species well adapted to the natural environment and that can support adverse environmental conditions, and so, at occasions, its presence can be indicative of environmental disturbances. Moreover, as the liver is very...
journal_title:Tissue & cell
pub_type: 杂志文章
doi:10.1016/j.tice.2017.12.009
更新日期:2018-02-01 00:00:00
abstract::Estrogen induces oocytes development and vitellogenesis in crustacean by interacting with estrogen receptor (ER) subtypes. In the present study, we detect for the first time the ERα in oocytes and follicle cells and hepatopancreas cells of mysis by immunohistochemistry using a specific ERα antibody. ERα was mainly loc...
journal_title:Tissue & cell
pub_type: 杂志文章
doi:10.1016/j.tice.2011.12.001
更新日期:2012-04-01 00:00:00
abstract::In this study we compared the effects of the Toll-like receptor (TLR) ligands lipopolysaccharide (LPS), flagellin, the synthetic bacterial triacylated lipopeptide Pam3-Cys-Ser-Lys4 (Pam3CSK4), Polyinosinic:polycytidylic acid (Poly I:C), and macrophage-activating lipopeptide (MALP-2), which are TLR4, TLR5, TLR1/2, TLR3...
journal_title:Tissue & cell
pub_type: 杂志文章
doi:10.1016/j.tice.2016.04.002
更新日期:2016-08-01 00:00:00
abstract::Specific biomechanical characters and some structures possibly related to them were investigated in the skin of the toad Bufo marinus using tensile testing techniques (at constant strain till rupture) as well as morphological methods (histological, immunohistochemical and electronmicroscopical). Mechanical parameters ...
journal_title:Tissue & cell
pub_type: 杂志文章
doi:10.1054/tice.2001.0208
更新日期:2001-10-01 00:00:00
abstract::The sarcoplasmic reticulum (SR) of the remarkably fast remotor muscle of lobster second antenna was investigated with regard to ultrastructure, calcium uptake and protein composition. The SR of this unique muscle dominates the volume of the cell. We were able to preserve the configuration of the SR in its native state...
journal_title:Tissue & cell
pub_type: 杂志文章
doi:10.1016/0040-8166(82)90015-5
更新日期:1982-01-01 00:00:00
abstract::A hydrogenosome is a hydrogen-producing organelle, evolutionary related to mitochondria and is found in Parabasalia protozoa, certain chytrid fungi and certain ciliates. It displays similarities to and differences from mitochondria. Hydrogenosomes are spherical or slightly elongated organelles, although very elongated...
journal_title:Tissue & cell
pub_type: 杂志文章,评审
doi:10.1016/j.tice.2009.01.001
更新日期:2009-06-01 00:00:00
abstract::Polychlorinated biphenyls (PCBs) are worldwide pollutants and have caused hazardous effects on many animal species including humans. They have been detected in human milk and therefore exposure of newborns to PCBs is unavoidable if they are breast-fed. We present our findings on two experiments performed to test the e...
journal_title:Tissue & cell
pub_type: 杂志文章
doi:10.1054/tice.2000.0168
更新日期:2001-04-01 00:00:00
abstract::A novel type of pore canal is described from the cuticle of three species of Gammarus. Each canal passes from the epidermis vertically through the endocuticle and exocuticle, and in the most distal layers of the latter is slightly expanded. Before entering the epicuticle the canal narrows, forming a neck the base of w...
journal_title:Tissue & cell
pub_type: 杂志文章
doi:10.1016/0040-8166(78)90053-8
更新日期:1978-01-01 00:00:00
abstract::Enzymatically dissociated hamster tracheal epithelial (HTE) cells were cultured on collagen coated Millicell filters. Within 3-5 days after being placed in culture large numbers of ciliated and mucus cells began to appear. By 1 week the HTE cells closely resembled those seen in vivo, i.e. columnar morphology and organ...
journal_title:Tissue & cell
pub_type: 杂志文章
doi:10.1016/0040-8166(87)90019-x
更新日期:1987-01-01 00:00:00
abstract::The epithelium of the gastric mucosa and its glands in the corpus of rat stomach contains mucous surface cells (MSCs), parietal cells, mucous neck cells (MNCs), zymogenic or chief cells (ZCs), several types of enteroendocrine cells, and intermediate cells with characteristics between MNCs and ZCs also called transitio...
journal_title:Tissue & cell
pub_type: 杂志文章
doi:10.1016/j.tice.2017.10.007
更新日期:2017-12-01 00:00:00
abstract::Cell surface expression of the epidermal growth factor (EGF) receptor in several cell lines declines as a function of increased cell density and is associated with diminished responsiveness to EGF. However, the mechanism whereby this density-induced down regulation of receptors occurs has not been discerned. In the pr...
journal_title:Tissue & cell
pub_type: 杂志文章
doi:10.1016/0040-8166(93)90061-o
更新日期:1993-01-01 00:00:00
abstract::Bilateral pairs of specific neurones in the metathoracic ganglion of the cockroach were used to study the ultrastructural changes which follow axon injury. The appearance of these matched pairs of cells was compared three days after the axons on one side of the ganglion only had been severed. The control or uninjured ...
journal_title:Tissue & cell
pub_type: 杂志文章
doi:10.1016/s0040-8166(70)80039-8
更新日期:1970-01-01 00:00:00
abstract::Harderian glands exist in the orbits of most terrestrial vertebrates. The basic function of the gland is the lubrication of the eye. The present study was carried out to shed some light on the ultrastructure of the still enigmatic Harderian gland of the lizard Uromastyx microlepis, a common species in Kuwait and other...
journal_title:Tissue & cell
pub_type: 杂志文章
doi:10.1054/tice.1999.0088
更新日期:2000-02-01 00:00:00
abstract::We used specific markers and fluorescence microscopy to identify and characterize cerebrovascular cells. Cultures were derived from brain microvessels isolated from normotensive (Wistar Kyoto, WKY) and spontaneously hypertensive (SHR) rat brains prior to, coincident with and following the onset of chronic hypertension...
journal_title:Tissue & cell
pub_type: 杂志文章
doi:10.1016/0040-8166(87)90005-x
更新日期:1987-01-01 00:00:00
abstract::The aim of this study was to identify and quantify the argyrophil, argentaffin and insulin-immunoreactive cells (IIC) in the small intestine of the opossum Didelphis aurita. Seven adult male specimens of opossums were investigated. The animals were captured, and their blood insulin levels were determined. After euthan...
journal_title:Tissue & cell
pub_type: 杂志文章
doi:10.1016/j.tice.2012.04.008
更新日期:2012-10-01 00:00:00
abstract::Parathyroid hormone/parathyroid hormone-related protein receptor (PPR) signaling is known to be involved in tooth development. In bone, extracellular matrix protein osteopontin (OPN) is a negative regulator of PPR signaling in bone formation. However, the role of OPN in modulation of PPR action in tooth development is...
journal_title:Tissue & cell
pub_type: 杂志文章
doi:10.1016/j.tice.2011.02.003
更新日期:2011-06-01 00:00:00
abstract::The localization of lactoferrin (LF) was studied in bovine exocrine glands by the peroxidase-antiperoxidase method. In general, LF immunoreactivity was demonstrated in most of the serous demilunes of the mixed glands and in some but not all acinar cells of the serous glands. LF was not detected in the acinar cells of ...
journal_title:Tissue & cell
pub_type: 杂志文章
doi:10.1016/0040-8166(93)90059-t
更新日期:1993-10-01 00:00:00
abstract::Kupffer's vesicle, a transitory organ peculiar to teleost embryos, was investigated in embryos of Fundulus heteroclitus by scanning electron microscopy. The roof of the vesicle is constructed to rather large columnar cells which are in continuity wiht hypoblast cells. Each of the roof cells is adorned with a single lo...
journal_title:Tissue & cell
pub_type: 杂志文章
doi:10.1016/0040-8166(78)90003-4
更新日期:1978-01-01 00:00:00
abstract::As part of an ongoing comparative fine structural study, the retinal pigment epithelium (RPE), choriocapillaris and complexus basalis (Bruch's membrane) in the emu (Dromaius novaehollandiae) have been investigated by light and electron microscopy. The RPE consists of a single layer of cuboidal cells joined basally by ...
journal_title:Tissue & cell
pub_type: 杂志文章
doi:10.1016/s0040-8166(98)80063-3
更新日期:1998-04-01 00:00:00
abstract::We have recently shown that down-regulation of mouse Thy28 (mThy28) protein expression appears to be accompanied by apoptotic processes. Thymocytes from mice contain moderate amounts of mThy28 protein and undergo proliferation, differentiation, or apoptosis during murine thymic maturation. As a first step to examine t...
journal_title:Tissue & cell
pub_type: 杂志文章
doi:10.1016/s0040-8166(03)00073-9
更新日期:2003-12-01 00:00:00
abstract::Two systems of microtubules appear to be functionally significant in the transformation of a small cell into an elongated, acellular 'corkscrew', which represents the anterior region of a sperm bundle of Pseudococcus obscurus. One system of microtubules lies within the cell; it is oriented parallel to the long axis of...
journal_title:Tissue & cell
pub_type: 杂志文章
doi:10.1016/s0040-8166(71)80029-0
更新日期:1971-01-01 00:00:00