Varia II: Éanainmneacha agus éanseanchas i bhfilíocht na scol

Pontificiae Academiae Scientiarvm Scripta Varia

New Type-I and Type-II Clathrates in the Systems Cs–Na–Ga–Si, Rb–Na–Ga–Si, and Rb–Na–Zn–Si

Systematic studies in the systems Cs–Na–Ga–Si, Rb–Na–Ga–Si, and Rb–Na–Zn–Si yielded the novel type-I clathrates with refined compositions Cs6Na2Ga8.25Si37.75(3), Rb6.34Na1.66(2)Ga8.02Si37.98(3), and Rb5.20Na2.80(4)Zn3.85Si42.15(2) (cubic,  Pm3 n ), as well as the type-II clathrates with formulae Cs8Na16Ga22.7Si113.3(1), Rb8.4Na15.6(1)Ga19.6Si116.4(1), and Rb8Na16Zn8.4Si127.6(1) (cubic,  Fd3...

Asymmetrical targeting of type II Na-P(i) cotransporters in renal and intestinal epithelial cell lines.

Targeting of newly synthesized transporters to either the apical or basolateral domains of polarized cells is crucial for the function of epithelia, such as in the renal proximal tubule or in the small intestine. Recently, different sodium-phosphate cotransporters have been identified. Type II cotransporters can be subdivided into two groups: type IIa and type IIb. Type IIa is predominantly exp...

CIRCUMSTELLAR Na I AND Ca II LINES IN TYPE IIP SUPERNOVAE AND SN 1998S

We study a possibility of detection of circumstellar absorption lines of Na I D1,2 and Ca II H,K in spectra of type IIP supernovae at the photospheric epoch. The modelling shows that the circumstellar lines of Na I doublet will not be seen in type IIP supernovae for moderate wind density, e.g., characteristic of SN 1999em, whereas rather pronounced Ca II lines with P Cygni profile should be det...

CIRCUMSTELLAR Na I AND Ca II LINES OF TYPE Ia SUPERNOVAE IN SYMBIOTIC SCENARIO

Formation of circumstellar resonant lines of Na I and Ca II in type Ia supernovae is studied for the case, when supernova explodes in a binary system with a red giant. The model suggests a spherically-symmetric wind and takes into account ionization and heating of the wind by X-rays from the shock wave and by gamma-quanta of Ni radioactive decay. For the wind density typical of the red giant th...