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Non-isothermal kinetics of high temperature oxidation studied by a fast X-ray diffraction method (1992)

Kolarik, V. ; Juez-Lorenzo, M. ; Eisenreich, N. ; [et al.]

Springer

Journal of thermal analysis and calorimetry 38 (1992), S. 649-655

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ISSN: 1572-8943

Keywords: corrosion ; high temperature oxidation ; non-isothermal kinetics ; X-ray diffraction method

Source: Springer Online Journal Archives 1860-2000

Topics: Chemistry and Pharmacology

Description / Table of Contents: Zusammenfassung Unter Anwendung eines Diffraktometers mit einer Hochtemperatureinheit wurde unterhalb 570°C mittels Röntgendiffraktion die Oxidation von Fe-ARMCO untersucht. Die Oxidationsprodukte wurden in situ bestimmt und das Differenzverfahren ergabY(T)-Kurven, die die globalen Änderungen zeigen. Diese Kurven wurden anhand der mikroskopisch bestimmten resultierenden Dicken der Oxidschicht kalibriert, wobei man die Funktionx(T) erhält. Dieser Kurve wurde eine berechnete, die Arrheniussche Beziehung enthaltende Funktion angepaßt, wodurch man die Aktivierungsenergie und die Oxidations Geschwindigkeitskonstante als Funktion der Temperatur erhält.

Notes: Abstract Temperature resolved X-ray diffraction using a diffractometer equipped with a high temperature device was applied to the study of the oxidation of Fe-ARMCO below 570°C. The oxidation products are identified in situ and the difference method yields curvesY(T) showing the global changes. These curves were calibrated to the microscopically measured end thickness of the oxide layer obtaining the growthx(T). A calculated curve including the Arrhenius relation was fitted to thex(T) curve yielding activation energy and values of the oxidation rate constant as a function of temperature.

Type of Medium: Electronic Resource

URL: http://dx.doi.org/10.1007/BF01979393

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Effect of cocaine and morphine on neutral endopeptidase activity of human peripheral blood mononuclear cells cultured with lectins (1993)

Leoni, Lorenzo M. ; Losa, Gabriele A.

New York, NY [u.a.] : Wiley-Blackwell

Cell Biochemistry and Function 11 (1993), S. 211-219

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ISSN: 0263-6484

Keywords: Lectins ; cocaine ; morphine ; human peripheral blood mononuclear cells (PBMNC) ; common acute lymphoblastic leukemia antigen (CALLA) ; neutral endopeptidase 3.4.24.11 (NEP) ; phospholipase C; 5′-nucleotidase ; subcellular localization ; Chemistry ; Biochemistry and Biotechnology

Source: Wiley InterScience Backfile Collection 1832-2000

Topics: Biology , Medicine

Notes: We have tested the effect of alkaloids (cocaine, morphine) and enkephalins on neutral endopeptidase of peripheral blood mononuclear cells activated by lectins. When treated with concanavalin A and cocaine, peripheral blood mononuclear cells showed an enhanced activity (+110 per cent) of the membrane neutral endopeptidase, which was not related to the expression of the common acute lymphoblastic leukemia antigen at the cell surface, although both molecules have the identical amino acid sequence. Phytohemagglutinin-P, morphine and synthetic enkephalins did not induce the activity of neutral endopeptidase nor the expression of common acute lymphoblastic leukemia antigen. Our findings suggested that the drugs of abuse, cocaine and morphine, affected specific membrane constituents without altering proliferation, subcellular localization of membrane enzymes or the surface immune phenotype of peripheral blood mononuclear cells.

Additional Material: 6 Ill.