Search results for "autor"
showing 10 items of 820 documents
Correlation between Baroreflex Sensitivity and Cerebral Autoregulation Index in Healthy Subjects
2021
Despite the acknowledged interaction between baroreflex and cerebral autoregulation (CA), their functional relationship remains controversial. The study investigates this relationship in a healthy population undergoing an orthostatic challenge. Thirteen healthy subjects (age: 27pm 8 yrs; 5 males) underwent electrocardiogram, arterial pressure (AP) and cerebral blood flow velocity (CBFV) recordings at supine resting (REST) and during 60° head-up tilt (TILT). CA was assessed via the autoregulation index (ARI) from spontaneous variations of mean AP and mean CBFV. The cardiac control and baroreflex were evaluated via frequency domain and transfer function analyses applied to systolic AP and hea…
Delayed postnatal neurogenesis in the cerebral cortex of lizards
1988
Labelled cells were consistently observed in the medial cortex of the lizard brain after i.p. injections of tritiated thymidine (5 microCi/g b. wt.), 1, 7, 18 or 28 days of survival and posterior autoradiographic evaluation. In 3 groups of specimens (postnatal, young and adult) of the species Podarcis hispanica, after one day of survival, labelled cells were located in the ependymal cell layer underlying the medial cortex. After intermediate survival times (7, 18 days), labelled cells were found in 3 zones: the ependymal layer, the inner plexiform layer and the granular layer. After one month of survival, most labelled cells were observed in the granular layer. In the granular layer, these …
Computation of Mean Cerebral Blood Flow Velocity for the Assessment of Cerebral Autoregulation: Comparison of Different Strategies
2019
Cerebral autoregulation (CA) is a complex mechanism stabilizing cerebral blood flow (CBF) against arterial pressure (AP) changes. CBF is commonly surrogated with the CBF velocity (CBFV) recorded via transcranial Doppler device from the middle cerebral artery. Most of the studies evaluating CA compute mean CBFV (MCBFV) on a beat-to-beat basis along with mean AP (MAP), but there is not a standard approach to derive MCBFV. In this study, we compare three different strategies to calculate MCBFV: i) between two consecutive diastolic points detected on the CBFV signal (MCBFVCBFV); ii) between two consecutive diastolic points detected on the AP signal (MCBFVAP); iii) between two consecutive R-wave…
Covalent DNA adducts formed by benzo[c]chrysene in mouse epidermis and by benzo[c]chrysene fjord-region diol epoxides reacted with DNA and polynucleo…
1997
The metabolic activation in mouse skin of benzo[c]chrysene (B[c]C), a weakly carcinogenic polycyclic aromatic hydrocarbon (PAH) present in coal tar and crude oil, was investigated. Male Parkes mice were treated topically with 0.5 mumol of B[c]C, and DNA was isolated from the treated areas of skin at various times after treatment and analyzed by 32P-postlabeling. Seven adduct spots were detected, at a maximum level of 0.89 fmol of adducts/microgram of DNA. Four B[c]C-DNA adducts persisted in skin for at least 3 weeks. Treatment of mice with 0.5 mumol of the optically pure putative proximate carcinogens (+)- and (-)-trans-benzo[c]chrysene-9,10-dihydrodiols [(+)- and (-)-B[c]C-diols] led to th…
Intervención de José Vidal-Beneyto en el debate sobre “Difference in thinking today”
2002
Versión en inglés de las intervenciones de José Vidal-Beneyto en el debate "La diferencia hoy pensada : El comienzo de la historia" [En: Portella, Eduardo (Dir.) (2000). Caminos del pensamiento: hacia nuevos lenguajes (pp. 111-112 ; 125 ; 131-132; 135 ; 146-149; 294). París: Ediciones UNESCO - La biblioteca del filósofo.]. Disponible también la versión francesa en: En: Portella, Eduardo (Dir.) (2000). Chemins de la pensée : vers de nouveaux langages (pp. 111-112; 125-126; 132; 135; 147-149; 296). Paris: Éditions UNESCO - La bibliothèque du philosophe.
Intervenciones de José Vidal-Beneyto en el debate "La diferencia hoy pensada : El comienzo de la historia"
2000
Versión en español de las intervenciones de José Vidal-Beneyto en el debate "La différence aujourd’hui pensée : le début de l’histoire" [En: Portella, Eduardo (Dir.) (2000). Chemins de la pensée : vers de nouveaux langages (pp. 111-112; 125-126; 132; 135; 147-149; 296). Paris: Éditions UNESCO - La bibliothèque du philosophe.]. Disponible también la versión inglesa en: Portella, Eduardo (Dir.) (2000). Thinking at crossroads: in search of new languages (pp. 109, 110, 121, 122, 127, 128, 131, 141-144 y 281). París: UNESCO Publishing - The Philosopher's Library.
Intervenciones de José Vidal-Beneyto en el debate "La différence aujourd’hui pensée : le début de l’histoire"
2000
Versión en francés de las intervenciones de José Vidal-Beneyto en el debate "La diferencia hoy pensada : El comienzo de la historia" [En: Portella, Eduardo (Dir.) (2000). Caminos del pensamiento: hacia nuevos lenguajes (pp. 111-112 ; 125 ; 131-132; 135 ; 146-149; 294). París: Ediciones UNESCO - La biblioteca del filósofo.]. Disponible también la versión inglesa en: Portella, Eduardo (Dir.) (2000). Thinking at crossroads: in search of new languages (pp. 109, 110, 121, 122, 127, 128, 131, 141-144 y 281). París: UNESCO Publishing - The Philosopher's Library.
Premessa
2020
Diurnal variation of corticotropin-releasing factor binding sites in the rat brain and pituitary.
1996
1. Corticotropin-releasing factor (CRF) is thought to be involved in the regulation of the diurnal activity of the hypothalamus-pituitary-adrenal (HPA) axis and to act as a neurotransmitter in the brain. To date it is unknown whether the binding sites of the central CRF system are subject to diurnal variations. 2. We measured the number of CRF binding sites over the course of a complete 24-hr light-dark cycle in the pituitary, amygdala, bed nucleus of the stria terminalis (BNST), cingulate cortex, visceral cortex, paraventricular nucleus of the hypothalamus, hippocampus, and locus ceruleus of rats by in vitro receptor autoradiography with iodinated ovine CRF. A 24-hr time course was also es…