Претраживање
Приказ резултата 21-30 од 32
Effects of fentanyl and its analogs on electric field-stimulated contractions of rat ileum
(Archives of Gastroenterohepatology, 1997)
Opiates inhibit electrically-stimulated contractions of isolated rat ileum acting on δ-receptors. We have examined effects of fentanyl and its three analogues on contractions of isolated rat ileum stimulated by electric ...
Investigation of the thermal behaviour of Ag-Pd intermetallic compounds in hydrogen atmosphere
(Elsevier Science Publ B V, Amsterdam, 1997)
It was shown by differential scanning calorimetry and X-ray diffraction that chemically prepared Ag-Pd intermetallic compounds of different composition in powder form are active hydrogen absorbers in the temperature range ...
Planar chromatography of facial and meridional isomers of some aminocarboxylato cobalt(III) complexes
(Springer Hungarica Kiado Kft, Budapest, 1997)
Types of tasks analysis in testing chemistry / Analiza tipova zadataka za proveru znanja iz hemije
(Nastava i vaspitanje, 1997)
Testing in chemistry teaching, as a means of estimating students achievement, is viewed through an analysis of results achieved in the tests with alternative or multiple choice. The aim of the work is to find a more ...
Infrared spectra of three M(I)M(III)S(2) type synthetic minerals (M(I)=Ag or Tl, M(III)=Sb or As)
(Marcel Dekker Inc, New York, 1997)
The infrared spectra of three compounds of the M(I)M(III)S(2) type (smithite, AgAsS2; weissbergite, TlSbS2; and miargyrite, AgSbS2) were studied at room temperature (RT) and at the boiling temperature of liquid nitrogen ...
Degradation of bricks and tiles .1. A review of processes
(Inst Chemical Technology, Dept Glass Ceramics, Prague, 1997)
Evaluating achievement in chemistry learning through demonstration experiments / Proveravanje znanja u nastavi hemije kroz demonstracione oglede
(Nastava i vaspitanje, 1997)
Our aim was to find out to which extent the students are capable of actively applying their knowledge of chemistry in explaining phenomena and processes they observed. A test was prepared, the answers to which were based ...
Synthesis of bridged cyclooctane derivatives via alkoxy radical fragmentation
(Pergamon-Elsevier Science Ltd, Oxford, 1997)
beta-Fragmentation of an alkoxy radical generated from ketol 4 under the conditions of hypohalite reaction afforded functionalized bridged cyclooctane derivatives 5 and 7 in excellent yields. Copyright (C) 1996 Published ...
Potassium 3-dithiocarboxy-3-aza-5-aminopentanoate dihydrate
(Munksgaard Int Publ Ltd, Copenhagen, 1997)
The synthesis and crystal structure of the title compound, K+. C5H9N2O2S2-. 2H(2)O, are described. The structure consists of potassium cations, 3-dithiocarboxy-3-aza-5-aminopentanoate anions and molecules of water. The ...
A new synthesis of alpha-tetralones.
(Pergamon-Elsevier Science Ltd, Oxford, 1997)
alpha-tetralones 8a-j can be prepared by radical cyclisation, in the presence of stoichiometric amounts of lauroyl peroxide, of xanthates 5a-j obtained by an intermolecular addition of substituted S-phenacyl xanthates 4a-c ...