Radiation-induced transformations of methanol molecules in low-temperature solids: a matrix isolation study.

The effect of X-ray irradiation on methanol molecules (CHOH, CDOH, and CHOH) isolated in solid noble gas matrices (Ne, Ar, Kr, and Xe) was studied by FTIR spectroscopy at 6 K. CHOH˙, HCO, HCO˙ and CO were found to be the main degradation products. Somewhat unexpectedly, the production of CO is quite prominent, even at low doses, and it strongly predominates in low-polarizable matrices (especially, in neon).

[Effect of nanodispersed manganese oxide (III, IV) on morphological properties of various tissues and body systems].

The study of morphological features of tissue organs of experimental animals after a single intragastric administration of an aqueous suspension nanodis-dispersed manganese (III, IV) at doses of 2000, 3500 and 5000 mg/kg showed complex of morphological changes in the form of circulatory disorders up to hemostasis and bleeding which lead to changes in the structure of organs, enhanced apoptosis, activation of macrophage system by proliferation and macrophage phagocytosis of degradation products of cells, hypertrophy of lymphoid tissue of immune system; development of histiocytic infiltrates in parenchymal organs and central nervous system. With the introduction of microsized analogues in the same doses of the morphological changes in the circulatory system, macrophage system and immune organsfound predominantly in a dose of 5000 mg/kg. Changes were less significant and were presented as activation of macrophages in the liver in the form of activation of Kupffer cells, proliferation of lymphoid tissue in the spleen, lymph histiocytic infiltrates in the liver, kidney, medium size.

Communication: stabilization of radical anions with weakly bound electron in condensed media: a case study of diacetonyl radical anion.

The radical anion resulting from electron capture by diacetonyl molecule has been characterized by EPR and optical absorption spectroscopy in glassy ether matrices at 77 K. In non-polar alkane glasses this species was not observed under the same conditions, which confirms the crucial role of matrix interactions in stabilizing this species. Calculations at the MP2 level show the vertical detachment energy to increase gradually from roughly zero for a bare anion to ∼1 eV for the complex involving six ether molecules.