Search results for "otas"

Opioid Inhibition of Oxytocin Release, but not Autoinhibition of Dopamine Release May Involve Activation of Potassium (K+) Channels

1991

ABSTRACT Release of oxytocin (Ox) or dopamine (DA) from the isolated neural lobes or neurointermediate lobes, respectively, was evoked by high K + (30 or 45 mM). Naloxone (1-10 μmol/l) which largely enhances the impulse-induced release of Ox had no effect on Ox release evoked by 30 or 45 mM K + . In the presence of 10 mM tetraethylammonium (TEA), Ox release evoked by 30 or 45 mM K + was increased 2-3fold; nevertheless, naloxone caused a further 2-3fold increase. Barium (500 μM) and quinidine (300 μM) antagonized the effect of naloxone observed in the presence of TEA. (-)-Sulpiride (10 μM) enhanced the release of DA evoked by 30 and 45 mM K + by 94 % and 19 %, respectively. TEA enhanced the …

A tandem-flow assembly for the chemiluminometric determination of hydroquinone

2003

A direct chemiluminescent procedure for determination of hydroquinone based on the emergent flow methodology known as multicommutation or tandem-flow is presented for first time. The manifold was based on a set of three channels and three solenoid valves; and, the determination was performed at 60degreesC and at flow-rate of 7.5 ml min(-1). The complete cycle lasted 35 s, which resulted in a sample flow trough of 103 h(-1). The chemical process was the hydroquinone oxidation with the system sulphuric acid-potassium permanganate; and the light emission was clearly enhanced by the presence of quinine sulphate and benzalkonium chloride reaching a detection limit of 30 Rg l(-1). The dynamic int…

Atkārtotu sakādisku acu kustību ietekme uz verģences atbildi

2015

Maģistra darbs ir uzrakstīts latviešu valodā uz 40 lapaspusēm. Tas satur 19 attēlus, 5 tabulas un 41 atsauci uz literatūras avotiem. Mērķis: izvērtēt atkārtotu sakādisku acu kustību ietekmi uz verģences atbildi. Metode: Četriem pētījuma dalībniekiem tika analizēts maksimālais verģences ātrums, laiks, kad tiek sasniegts maksimālais verģences ātrums, dubultās verģences un sakāžu skaits pirms un pēc nogurdināšanas. Rezultāti un secinājumi: Nogurums katra pētījuma dalībnieka verģences atbildi ietekmē atšķirīgi. Izteiktākas izmaiņas novērotas diverģences atbildē, kā arī pie lielākiem verģences stimuliem. Atšķirība sakāžu un dubultās verģences skaitā pirms un pēc noguruma netika konstatēta.

Minerali Macro

2006

Über die anionische polymerisation von acrolein. Polymere acroleine. 34. Mitt.1

1967

Acrolein wurde mit Lithium-, Natrium- oder Kaliumcyanid in Tetrahydrofuran bzw.in Toluol polymerisiert. Die Abhangigkeit der Polymerisationsgeschwindigkeit und der Struktur der Polymeren von Reaktionsmedium, Temperatur und Gegenion wurde untersucht. Unterhalb -10°C polymerisiert Acrolein mit Natriumcyanid nur uber die CO. Doppelbindung. Es entstehen hochmolekulare, losliche Poly-3,4-acroleine. Oberhalb -10°C wird dagegen auch Polymerisation uber die Vinylgruppe beobachtet. Die Kurve fur die Abhangigkeit der Polymerisationsgeschwindigkeit von der Reaktionstemperatur durchlauft Extremwerte. Es wird ein Mechanismus aufgestellt, der die jeweilige Struktur des Polymeren als Ergebnis von Gleichge…

Baeyer—Villiger Oxidation in Supercritical CO2 with Potassium Peroxomonosulfate Supported on Acidic Silica Gel.

2006

Supercritical carbon dioxide (scCO2) is an efficient reaction medium to perform the Baeyer-Villiger oxidation with hydrated silica-supported potassium peroxomonosulfate (h-SiO2.KHSO5) under flow-through conditions. Hydration modulates the reactivity of the active surface by softening the acidity of the KHSO4 present in the supported reagent. The reaction in scCO2 is much more efficient than in n-hexane under similar conditions, which is attributed to better transport and solvating properties of the supercritical medium with regard to n-hexane.

Synthesis and evaluation of (S)-2-(2-[18F]fluoroethoxy)-4-([3-methyl-1-(2-piperidin-1-yl-phenyl)-butyl-carbamoyl]-methyl)-benzoic acid ([18F]repaglin…

2004

18F-labeled non-sulfonylurea hypoglycemic agent (S)-2-(2-[(18)F]fluoroethoxy)-4-((3-methyl-1-(2-piperidin-1-yl-phenyl)-butylcarbamoyl)-methyl)-benzoic acid ([(18)F]repaglinide), a derivative of the sulfonylurea-receptor (SUR) ligand repaglinide, was synthesized as a potential tracer for the non-invasive investigation of the sulfonylurea 1 receptor status of pancreatic beta-cells by positron emission tomography (PET) in the context of type 1 and type 2 diabetes. [(18)F]Repaglinide could be obtained in an overall radiochemical yield (RCY) of 20% after 135 min with a radiochemical purity higher than 98% applying the secondary labeling precursor 2-[(18)F]fluoroethyltosylate. Specific activity w…

intelektuālā īpašuma aizsardzība muitas iestādē.

2017

Maģistra darbs „Intelektuālā īpašuma aizsardzība muitas iestādē” sniedz ieskatu Latvijas tiesību sistēmā pastāvošajās problēmās attiecībā uz intelektuālā īpašuma tiesību aizsardzību muitā, salīdzinot muitas iestāžu darbību intelektuālā īpašuma tiesību aizsardzības jomā Latvijā un citās Eiropas Savienības dalībvalstīs. Darbs kopumā ir sadalīts trīs nodaļās, sākot ar intelektuālā īpašuma tiesību un viltoto preču jēdzienu analīzi un jautājuma par intelektuālā īpašuma tiesību tvērumu muitas darbību reglamentējošos normatīvajos aktos izpēti, turpinot ar pārkāpuma preču konstatēšanas kārtību Valsts ieņēmumu dienestā, un beidzot ar izvērstu muitas darbību reglamentējošo normatīvo aktu piemērošanas…

Flow injection-chemiluminescence determination of octyl dimethyl PABA in sunscreen formulations

2002

Abstract A sensitive flow injection (FI) procedure was developed for the determination of the UV-filter octyl dimethyl PABA in sunscreen formulations based on its chemiluminescence (CL) induced by potassium permanganate in sulfuric acid. Both second-order and log–log calibration graphs can be used to perform the analysis. Ninety injections per hour can be carried out, which means a sample throughput of 18 h −1 if five injections per solution are performed. The limit of detection (3 σ ) was 25 ng ml −1 . The interference effects of the excipient and other UV filters are studied. Sunscreen formulations containing octyl dimethyl PABA were analysed by both the proposed FI-CL method and a liquid…

Insulin resistance and endogenous digoxin-like factor in obese hypertensive patients with glucose intolerance

1992

Hypertensive obese subjects with glucose intolerance have hyperinsulinaemia, insulin resistance and intracellular cation imbalance resulting in increased sodium content. The aim of our study was to assess in these patients plasma levels of endogenous digoxin-like factor (EDLF), an inhibitor of the sodium-pump mechanism. We studied 14 hypertensive and 12 normotensive subjects with obesity and glucose intolerance for fasting blood glucose, and plasma insulin, C-peptide and EDLF levels: the two groups were matched for age and BMI and were studied after a 2-week wash-out period from hypotensive drugs. Compared with normotensives, hypertensive subjects had higher plasma insulin levels, a greater…