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Biomedical subjects

B Valentino

Publications and source records attributed to B Valentino.

36 records · Page 2Linked to original sources
PubMedDate not supplied

Atrial natriuretic peptide secretion during development of the rat supraoptic nucleus.

Since a relationship between atrial natriuretic peptide and oxytocin was recently demonstrated in the heart (Gutkowska et al., 1997), the aim of this study was to determine whether a relationship between the two peptides is present also in the rat hypothalamus. For this purpose, we measured ANP-ontogeny in the rat hypothalamus immunohistochemically and compared it with oxytocin-ontogeny which we previously studied. The results showed that the ANP-peptide and mRNA-ANP start at the 18th day of the fetal life. Our earlier data for oxytocin in the rat hypothalamus showed that only mRNA-oxytocin appeared the 18th day of foetal life (Farina Lipari et al., 2001); thus, at the 18th day of foetal life, mRNA-ANP, ANP-peptide and mRNA-oxytocin are present. We conclude that in the hypothalamus, differently from that in the heart, ANP might play a role on the synthesis of the oxytocin since ANP and its mRNA appear earlier than oxytocin.

Animals↗
PubMedDate not supplied

Correlation between interdental occlusal plane and plantar arches. An EMG study.

The Authors carried out an experimental study on a homogeneous group of young people to provide evidence of functional correlation among masticatory muscles and, indirectly, between changes to the interdental occlusal plane and modifications of the plantar arches due to talipes valgus and flat foot. In the two analysed conditions, the masticatory muscles undergo different functional alterations. This is due to the fact that the mechanoreceptors in the tendons of the muscles governing the plantar arch configuration are stimulated in different ways during the activation of long osteoarthromuscular chains. Dental specialists will have to take these correlation into account when diagnosing TMJ disorders.

Adult↗
PubMedDate not supplied

An EMG study on TMJ disorders.

The Authors have described a clinical case involving a patient with a classical TMJ syndrome and a full range of typical symptoms, both dental and non-dental. The patient underwent a set of EMG tests before his occlusal plane was restored using a special material, immediately following reconstruction and, lastly, three months following the application of a prosthesis. The findings of these EMG tests have shown that the complex symptoms reported by the patient could be traced back to his occlusal plane. Once it was reconstructed, all the typical dental and non-dental symptoms of TMJ disorders subsided.

Dental Occlusion, Traumatic↗
PubMedDate not supplied

Biologic effects of ultrasound on liver cells of rat embryos.

Experiments on the biologic effects of ultrasound (US) were carried out on rat embryos exposed for 120 s to a US beam showing features similar to those already employed for diagnostic purposes. Electron microscopic investigation of the liver parenchyma of rat embryos confirmed results obtained from adult guinea pigs with the same duration of exposure, i.e. diffuse vacuolization of cytoplasma and varying degrees of mitochondrial damage.

Animals↗
PubMedDate not supplied

[Experimental studies on possible biological effects of ultrasonic diagnosis: ultrastructural analysis of rat embryo].

Within the limits of a systematic research on the biological effects of the ultrasounds, the authors refer on their personal experience on rat's embrions treated, for 120 seconds, with a ultrasonic beam having the common characteristics used in diagnostic investigations. The ultra-structural studies on the hepatic parenchyma substantially confirm the previous results obtained in the adult cavy, exposed for the same period of time, i.e. a diffuse cytoplasmic vacuolization and an unstable mitochondrial damage. Various suggestions are advanced on the particular sensibility that the mitocondria show because of the ultrasonic action. The authors explain the limits of their experimentation in this specific sector of the scientific research.

Animals↗
PubMedDate not supplied

Immunohistochemical research on vasopressin in the accessory hypothalamic nuclei.

Immunohistochemical studies were performed using antivasopressin on the neurons and the accessory nuclei of the anterior hypothalamic region of rat. Accessory neurons had a positive vasopressin reaction which was similar to that already found in the supraoptic and paraventricular nuclei. The accessory neurons should therefore be considered part of the neurosecretory magnocellular system because of their morphological aspect, and because of their secretory activity.

Animals↗
PubMedDate not supplied

Immunohistochemical research on the atrial natriuretic factor (ANF) in rat atrioventricular valves.

Immunohistochemical research on atrioventricular valves in normotensive rats revealed that valvular myocardiocytes are the seat of synthesis of the atrial natriuretic factor (ANF). The endocardial cells that border the atrial and ventricular surfaces also had granules which were positive for ANF. The ANF which is also synthesized in the valvular myocardiocytes moved towards the cardiac cavity and crossed the endocardial cells in the more distal areas of the valvular edge. At the same time, the ANF was routed into the blood vessels in the areas close to implantation.

Animals↗
PubMedDate not supplied

Immunohistochemical research on oxytocin in the hypothalamic accessory nuclei.

Immunohistochemical research on the monoclonal antibody, anti-oxytocin, was carried out on hypothalamic accessory nuclei. The nuclei and the accessory neurons were strongly positive in much the same way as the supraoptic and paraventricular nuclei. These results indicate that the accessory nuclei are able to synthesize the neurohormone oxytocin. Based on the present research and on preceding papers, it is possible to affirm that the accessory nuclei synthesize both oxytocin and vasopressin. Therefore the accessory nuclei must be considered an integral part of the magnocellular hypothalamic neurosecretory system.

Animals↗