Search results for "metan"
showing 10 items of 60 documents
La produzione ed il trasporto di energia rinnovabile. L'impianto di biometano di Caltanissetta e l'allacciamento alla rete del gas naturale
2022
Le centrali di energia elettrica alimentate da fonti rinnovabili sono spesso oggetto di contestazione da parte di amministrazioni e comunità locali nel cui territorio sono ospitate. La disciplina del biometano, da questo punto di vista, è emblematica. Il legislatore prevede una serie di incentivi alla produzione di energia attraverso tale fonte, e, coerentemente, stabilisce una serie di procedure semplificate per la realizzazione dei necessari impianti. La costruzione di questi ultimi, tuttavia, si scontra in concreto con numerosi intoppi e ritardi natura amministrativa o burocratica. The power plants using renewable sources are often subject of dispute by local administrations and communit…
Agamennone βουληφόρος? La sovranità alla prova del processo deliberativo
2022
Starting with the Iliad, Agamemnon is mostly depicted at the centre of dramatic deliberative situations. This feature is also present in fifth-century literature, particularly in some plays in which Agamemnon’s decision-making ability in uncertainty comes into tension with other characters in order to determine the ‘right’ decision and adequate leadership features. In this paper, I will focus on the Euripides’ play Iphigenia in Aulis (405 a.C.). In this tragedy the behaviour of the Achaean king draws our attention, as he is not equipped to handle his role and responsibilities. In the same years, also historiography is interested in the nature and risks of the deliberative process, as Thucyd…
Kinetic Properties of Cl−Uptake Mediated by Na+-Dependent K+-2Cl−Cotransport in Immature Rat Neocortical Neurons
2007
GABA, the main inhibitory neurotransmitter in the adult nervous system, evokes depolarizing membrane responses in immature neurons, which are crucial for the generation of early network activity. Although it is well accepted that depolarizing GABA actions are caused by an elevated intracellular Cl−concentration ([Cl−]i), the mechanisms of Cl−accumulation in immature neurons are still a matter of debate. Using patch-clamp, microfluorimetric, immunohistochemical, and molecular biological approaches, we studied the mechanism of Cl−uptake in Cajal-Retzius (CR) cells of immature [postnatal day 0 (P0) to P3] rat neocortex. Gramicidin-perforated patch-clamp and 6-methoxy-N-ethylquinolinium-microfl…
Trihalomethanes in swimming pool water in four areas of Spain participating in the INMA project
2010
ResumenObjetivoLa natación es uno de los deportes más practicados en España, por personas de todas las edades y condiciones físicas. También es una vía de exposición a subproductos de la desinfección, compuestos potencialmente tóxicos. Su concentración en el agua de las piscinas no está legislada y es poco conocida. El objetivo de este trabajo es describir la concentración de trihalometanos en el agua de piscinas de los municipios de cuatro cohortes del estudio INMA.MétodosEn julio de 2009 se analizaron los trihalometanos en el agua de piscinas (n=27) de Asturias, Granada, Valencia y Sabadell.ResultadosLa concentración media de trihalometanos totales fue de 42,7μg/l (desviación estándar [DE…
Trihalomethanes in swimming pool water in four areas of Spain participating in the INMA project
2010
Objetivo: La natación es uno de los deportes más practicados en España, por personas de todas las edades y condiciones físicas. También es una vía de exposición a subproductos de la desinfección, compuestos potencialmente tóxicos. Su concentración en el agua de las piscinas no está legislada y es poco conocida. El objetivo de este trabajo es describir la concentración de trihalometanos en el agua de piscinas de los municipios de cuatro cohortes del estudio INMA. Métodos: En julio de 2009 se analizaron los trihalometanos en el agua de piscinas (n=27) de Asturias, Granada, Valencia y Sabadell. Resultados: La concentración media de trihalometanos totales fue de 42,7µg/l (desviación estándar [D…
Activation of glycine receptors modulates spontaneous epileptiform activity in the immature rat hippocampus
2014
While the expression of glycine receptors in the immature hippocampus has been shown, no information about the role of glycine receptors in controlling the excitability in the immature CNS is available. Therefore, we examined the effect of glycinergic agonists and antagonists in the CA3 region of an intact corticohippocampal preparation of the immature (postnatal days 4-7) rat using field potential recordings. Bath application of 100 μM taurine or 10 μM glycine enhanced the occurrence of recurrent epileptiform activity induced by 20 μM 4-aminopyridine in low Mg(2+) solution. This proconvulsive effect was prevented by 3 μM strychnine or after incubation with the loop diuretic bumetanide (10 …
SENSITIZED LANTHANIDE FLUORESCENCE DETECTION OF STEROIDAL HORMONES
2000
Several steroidal hormones with an α,β-unsaturated carbonyl group sensitized the fluorescence of terbium(III) ions: medroxyprogesterone, medroxyprogesterone acetate, methyltestosterone, nandrolone, nandrolone decanoate, progesterone, testosterone, testosterone enanthate, and testosterone propionate, but other steroids which have this chromophore did not give any signal: clostebol acetate, dehydrotestosterone, dydrogesterone, methandienone, and methenolone enanthate. Sensitized fluorescence was used to detect the steroids when eluted with micellar mobile phases of sodium dodecyl sulphate (SDS)-acetonitrile and SDS-pentanol containing 0.01 M Tb(III), with 245 nm and 545 nm as excitation and e…
Analysis of Diuretics in Urine by Column-Switching Chromatography and Fluorescence Detection
1997
The potential of column-switching chromatography and fluorescence detection for the analysis of diuretics in urine is evaluated. Sample cleanup and chromatographic parameters have been optimized to achieve maximum sensitivity for the detection and quantification of some relevant diuretics. On the basis of these studies, an on-line procedure for the simultaneous determination of amiloride, furosemide, bumetanide and triamterene is presented. The linearity, precision, accuracy and sensitivity of the method are discussed. The utility of the described approach has been tested by analysing urine samples obtained after administration of bumetanide.
Chromatographic determination of diuretics in urine samples using hybrid micellar mobile phases with fluorimetric detection
1998
Abstract A rapid and simple chromatographic procedure, that uses hybrid micellar mobile phases of sodium dodecyl sulphate (SDS), propanol and phosphate buffer at pH 3, and fluorimetric detection ( λ exc =270 nm, λ em =430 nm), is reported for the determination of mixtures of seven diuretics of diverse efficacy (amiloride, bendroflumethiazide, bumetanide, furosemide, hydroflumethiazide, piretanide and triamterene), in urine samples. The application of a sequential optimization procedure for the resolution of the mixtures of the diuretics was problematic. However, their separation was achieved through the use of an interpretive optimization procedure based on the accurate description of the r…
ITS region of Pythium canariense sp. nov., its morphology and its interaction with Botrytis cinerea.
2002
A new species Pythium canariense (CI-07), isolated from soil samples taken in the San Nicolas region of the Canary islands (Gran Canaria, Spain), is being described here. This species is characterised by its spherical to pyriform, intercalary to catenulate sporangia, smooth-walled terminal oogonia supplied with monoclinous and diclinous antheridia which at times are branched and wrap around the female gametangia. The fungus has an antagonistic effect on Botrytis cinerea, the grey mould fungus. Morphological features are being given here together with the sequence of the complete internal transcribed spacer region of the nuclear ribosomal DNA of the fungus, its comparison with related specie…