The oxygen diffusion and exchange behaviour of NdBa2Cu307_ ~ is investigated by means of isothermal and dynamic-thermal analytical techniques. From the results it is concluded that oxygen anions move along vacancies in the CuO2-1ayers of the perovskite-like structure. In temperature regions where the diffusion rate is low (665 K < T< 773 K) heterogeneous oxygen exchange reactions take place on the phase boundary. The higher the exchange rate the more the partially heterogeneous exchange is favoured in comparison to the completely heterogeneous isotope exchange. Depending on the oxygen deficiency of NdBa2CU3OT_ x the out-diffusion of oxygen becomes dominating at higher temperatures.
2001 inorganic chemistry, review inorganic chemistry, review Z 0100 29 -202 Unusual Approaches to the Preparation of Heterogeneous Catalysts and Supports Using Water in Subcritical and Supercritical States -[17 refs.]. -(GALKIN, A. A.; KOSTYUK, B. G.; KUZNETSOVA, N. N.; TURAKULOVA, A. O.; LUNIN, V. V.; POLYAKOV, M.; Kinet. Catal. (Transl. of Kinet. Katal.) 42 (2001) 2, 154-162; Dep. Chem., Lomonosov Moscow State Univ., Moscow 119899, Russia; EN)
The mobility of neutrophils is found to be depressed by serotonin antagonists (toxins and drugs) in patients with wound infection. Addition of serotonin eliminates serotonin insufficiency of neutrophils, which is expressed in acceleration of their mobility. Data are presented showing that serotonin is indispensable for maintaining neutrophil and platelet homeostasis.
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