Search PubMed⌕ Search

Biomedical subjects

T Renda

Publications and source records attributed to T Renda.

At least 55 records · Page 3Linked to original sources
PubMed1977

[Observations by scanning electron microscopy (SEM) on the surface of mesothelial cells of different peritoneal areas of rat (author's transl)].

Observations by Scanning electron microscopy (SEM) showed numerous microvilli on the surface of mesothelial cells of different peritoneal areas. In addition a number of saccular invaginations provided with microvilli or small intercellular clefts have been observed between the cells. These superficial invaginations may correspond to the "stomata" of the light microscopy. Because of the number of microvilli projecting inside the clefts it was not possible to determine whether they open directly on the base of the cells. As the light of the Scanning electron microscopy observations and considering the transmission electron microscopy results on the intercellular boundaries in mesothelial cells it is possible to assume that the actual clefts ("stomata") are continuous and open in the main intercellular channels. Then it is not possible to exclude that these intercellular channels with their labyrinthine and tortuous course may open into the subjacent connective tissue.

Animals↗
PubMed1976

[Histochemical studies of the endocrine cellular components of swine duodenal glands (Brunner's glands)].

The AA. describe an endocrine cells presence in the Pig Brunner's duodenal glands by means of histochemical methods at light microscope. Between these they can recognize two types of cells: these enterochromaffins (EC) and these non-enterochromaffins (non-EC), both presents either in the secretory part of the glands or in the deeper parts of the ducts. The EC-cells show generally a prismatic size and their apical part attains the glandular cavity. Their granules are much numerous and recognizables either in the basal part or in other parts of the cells. The non-EC-cells show a variable, from the prismatic to the spheroidal, size. Their granules are numerous and recognizables mostly in the basal part of the cells. Between the non-EC-cells they can also differentiate at least three types: a) these Davenport-positives and poorly argyrophils; b) these Davenport-positives and clearly argyrophils and c) these Davenport-negatives and clearly argyrophils. All cells are by lead-haematoxylin stainables, while by the HCL-BT method the EC-cells are ortochromatics and these non-EC are metachromatics.

Animals↗
PubMed1976

[Histochemical and histoenzymatic studies of chick-embryo tibial rudiments cultured in vitro in the presence of bovine growth hormones].

The AA. have studied the effect of the bovine GH on the cellular and intercellular components of the chick embryo tibias cultured organotypically. They have observed a strong increase of the proliferative activity of the chondroblasts such as showed by a stronger uptake of the tritiated timidine by traited tibias in comparison with the control tibias. The chondroblasts of the traited tibias show an increase of some enzymatic activities connected with the aerobic cycle and of the UDPG-DH, connected with the uronic acids cycle. In the amorphous matrix of the traited tibias they have showed a greater polimerisation and sulfation of the condroitinesulfate A and C, which, almost exclusively, constitute the mucopolisaccharidic component of the matrix.

Animals↗
PubMedDate not supplied

Sauvagine/urotensin I-like immunoreactivity in the caudal neurosecretory system of a seawater fish Diplodus sargus L. in normal and hyposmotic milieu.

We report the presence of sauvagine/urotensin I-like immunoreactive (SV/UI-LI) elements in the caudal neurosecretory system of a teleost (Diplodus sargus L.) collected from aquaria tanks of the Aquaculture Center (Talassographic Institut of CNR) of Messina or maintained in an hyposmotic milieu for different periods. In normal specimens, SV/UI-LI material was recognizable in discrete or little amounts both in Dahlgren cell cytoplasm and in their axons that reach the urophysis. On the contrary, the specimens transferred in an hyposmotic milieu showed a fast and dramatic increase of immunoreactivity mainly in neurohemal endings of the urophysis. This suggests a physiological role of caudal neurosecretory products on osmoregulatory mechanisms.

Acclimatization↗