Wyniki wyszukiwania - BazTech

Ograniczanie wyników

Znaleziono wyników: 2

Liczba wyników na stronie

Wyniki wyszukiwania

Sortuj według:

Ogranicz wyniki do:

Determination of morphine and codeine in serum after poppy seed consumption using gas chromatography-mass spectrometry

Mátyus M, Kocsis Gy, Boldis O, Karvaly G, Magyari E., Fűrész J, Gachályi A

Acta Chromatographica

2012

Vol. 24, no. 3

351--365

A sensitive method was developed for the determination of free morphine and codeine in blood. This method is suitable for detection of the ingestion of illicit drugs. This test is applicable for monitoring therapeutic doses as well as stand up in the court of law. For the test we use with deuterium tagged morphine and codeine. We tag the blood specimens with deuterium prior to testing. The active ingredients (morphine and codeine) are extracted by solid phase extraction, and eventually derivatized with pentafluoro propionic anhydride (PFPA). The resulting compounds are stable and have good chromatographic characteristics. The Gas-chromatograph coupled Mass-spectrometer (GC/MS) system is used to determine the concentration of the resulting compounds using or/in the selective ion mode (SIM). The results of the target and qualifier ions were 414, 577, 361 in the case of morphine, and 282, 445 in the case of codeine. During our measurements, the graph was linear between 1 and 100 ng / mL. All the results of the qualifications were in line with the German Standards DIN 32645, which were checked with the B.E.N. program.

Unsteady free convection over a vertical plate subject to a step change of the surface temperature or heat flux in a stratified porous medium

Magyari E., Keller B., Pop I.

International Journal of Applied Mechanics and Engineering

2007

Vol. 12, no 2

465-476

The problem of unsteady free convection heat transfer from a one-dimensional (parallel) flow along an infinite verticaI fiat plate embedded in a thermaIly stratified fluid-saturated porous medium is considered. FIows are induced by a step change in surface temperature or heat flux. By a formaI reduction of the corresponding boundary vaIue problems to well known Fourier heat conduction problems, analytical solutions of the Darcy and energy equations are obtained.