Changes in esophageal mucosal morphology and in growth of breast feeding rats fed with milk of low or high temperature.

Dear Editor, This rather original investigation was performed some time ago but is still unpublished. Its aim was to estimate the effect of low or high temperature cow's milk given to breast feeding rats in order to study possible influence of this diet to rats, to their physical growth and also esophageal mucosal pathology. Ten white female Wistar rats, 20 days of age were separated from their mothers and divided in 2 groups of 5 members each.

Craniofacial abnormalities induced by retinoic acid: a preliminary histological and scanning electron microscopic (SEM) study.

Exogenous retinoic acid has been found to be teratogenic in animals and man. Craniofacial defects induced by retinoic acid have stimulated considerable research interest. The present report deals with scanning electron microscopical observations of the craniofacial region concurrent with histological examination of craniofacial dysmorphism induced in rat embryos following maternal treatment treated with varying dosages of all-trans-retinoic acid (tretinoin).

All trans retinoic acid interfering with palatal development. Scanning electron microscopical and light microscopical observations on embryonic rat palate.

Diverse studies on retinoic acid teratogenesis, during the recent years, indicate that the drug's analogues target on diverse cell population during differentiation in mammals. During an extended teratological protocol concerning retinoic acid influence in diverse embryonic tissue differentiation in experimental animals we studied all-trans-retinoic acid's influence on palatal development in the white rat embryo. For this purpose, six groups of white rat embryos were studied: Group 1 was treated with 100 mg/kilogram of body weight (k.

"Hanseniaspora uvarum" the ultrastructural morphology of a rare ascomycete, isolated from oral thrush.

Superficial fungal infections, including oral thrush, often affect aged full denture wearers and many individuals over 65 years old. The aim of this study was to examine the ultrastructural morphology of a very rare yeast, named Hanseniaspora uvarum/guillermondi, member of the Ascomycetes family, whose pathogenesis and behaviour is not widely known. The yeast was isolated from whitish lesions of the buccal mucosa of an 70 years old woman.

Ultrastructural alterations of the rabbit sciatic nerve, spinal cord and cerebellum, following methionine sulphoximine administration.

Methionine sulphoximine (MSO) is a centrally acting neurotoxin which inhibits the glutamate metabolism enzymes and has convulsive properties. Small doses of MSO were administered to rabbits, either intravenously (i.v.

Ultrastructural alterations of the rat intestinal epithelium fed with polymeric, oligopeptidic or elementary full diet, following starvation.

In this study the ultrastructure of rat jejunal epithelial cells was examined, following a starvation period of 72 hours and an enteral refeeding period of 12 days, with either Nutrison, Pepti 2000, or Nutri 2000. Most changes occurred in the animals examined immediately after the 72-hour starvation period; these mainly included a significant decrease in microvilli population, occasional cell membrane disintegration, and a usual microvesicular appearance and degranulation of the rough endoplasmic reticulum. No alterations were found in the normally-fed animals (control group).

Pinocytotic vacuoles in human dental pulp capillaries.

Dental pulp capillaries were studied in human. They were of the continuous type, with the exception of a small number which were of the fenestrated type, located in the vicinity of the odontoblasts. A characteristic morphological peculiarity was found in the endothelial cells.

Histochemical localization of salivary glycoproteins in the submandibular gland of aging rats.

It is known that submandibular glands produce serous saliva in the serous demilune cells and mucous saliva in the mucous acinar cells which is a viscous, rich in glycoproteins substance. The aim of this study was the comparative histochemical investigation of acid and neutral salivary glycoproteins in the acinar cells of the submandibular gland in adult and aging rats. Three groups of female Wistar rats were studied: a) young adult rats, 3 months old, b) aged rats 25 months old, c) aged rats 30 months old.

Morphogenesis and ultrastructure of the peripolar cells in the mouse kidney.

Peripolar cells are located in the outer layer of the Bowman's capsule. They surround the vascular pole of the renal corpuscle and project into the urinary space. Morphologically they are characterized by the presence of secretory granules within their cytoplasm.

Ultrastructural study of bronchial epithelium in chronic respiratory diseases.

The fine structure of bronchial epithelium in thirty-six patients, thirty-one men and five women, suffering from chronic obstructive pneumonopathy or bronchial carcinoma was studied. No remarkable alterations were found with electron microscopy, in most non-smokers in contrast to the smokers who presented destruction of the epithelial cells and loss of the cilia or many pathological cilia with an abnormal microtubular configuration and irregular orientation. The severity, however, of the alterations was not related to the severity of smoking and to the presence of bronchial cancer.

Ultrastructure of the rat hippocampus after isobaric respirative hyperoxia.

After exposing rats to an environment of isobaric hyperoxia, the ultrastructural alterations of the hippocampus were studied. No major alterations were found in the nerve cells. Of importance was the moderate osmiophilia and the spindle-like transformation of the mitochondria.

Formalin-induced experimental sclerosing cholangitis in the rat.

The few reported cases of sclerosing cholangitis following removal of an echinococcus cyst are thought to be a consequence of the chemical action of formalin used for sterilization of the residual cavity. The aim of this study was to assess this hypothesis. We injected 0.

Ultrastructural changes of the renal cortex after septic shock in rats.

The purpose of this study was to observe the ultrastructural changes of the renal cortex that occur in septic shock. Twenty male Wistar rats were used. They were divided into 4 groups of five animals each one.

Electron microscopic study of the oviduct epithelium of the rabbit: normal structure and modifications in 4 weeks experimental hydrosalpinx.

The ultrastructure of the oviduct epithelium in its ampullary portion has been examined in 10 rabbits. As normal control material we used microbiopsies of tubal mucosa, taken before ligature of the oviduct. The experimental material consisted of microbiopsies of tubal mucosa, taken in the same animals, 4 weeks after ligature of the oviduct and subsequent induction of hydrosalpinx.

Ultrastructure and function in sympathetic ganglia isolated from rats infected with pseudorabies virus.

(1) After inoculation of the pseudorabies virus in the anterior chamber of the eye of the rat, virions can be found only in the neurons of the superior cervical sympathetic ganglion and in the sensory ganglion of the fifth nerve on the inoculated side. Other nervous structures--central or peripheral--are not infected. (2) It is shown that the retrograde axonal flow carries the virus from the eye to the sympathetic neurons.