Die Röntgenolumineszenz der Kristalle von NaCl: Fe

Ohne Zusammenfassung

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Nacl: Fe

     

Design of a doubly-hydrophilic block copolypeptide that directs the formation of calcium carbonate microspheres

The crystallization of calcium carbonate into microspheres has been accomplished using the rationally-designed, doubly-hydrophilic block copolypeptide poly(Nepsilon-2[2-(2-methoxyethoxy)ethoxy]acetyl-L-lysine)(100)-b-poly(L-aspartate sodium salt)30 as a structure-directing agent.     

The role of conformational flexibility on protein supercharging in native electrospray ionization

Effects of covalent intramolecular bonds, either native disulfide bridges or chemical crosslinks, on ESI supercharging of proteins from aqueous solutions were investigated. Chemically modifying cytochrome c with up to seven crosslinks or ubiquitin with up to two crosslinks did not affect the average or maximum charge states of these proteins in the absence of m-nitrobenzyl alcohol (m-NBA), but the extent of supercharging induced by m-NBA increased with decreasing numbers of crosslinks. For the model random coil polypeptide reduced/alkylated RNase A, a decrease in charging with increasing m-NBA concentration attributable to reduced surface tension of the ESI droplet was observed, whereas native RNase A electrosprayed from these same solutions exhibited enhanced charging. The inverse relationship between the extent of supercharging and the number of intramolecular crosslinks for folded proteins, as well as the absence of supercharging for proteins that are random coils in aqueous solution, indicate that conformational restrictions induced by the crosslinks reduce the extent of supercharging. These results provide additional evidence that protein and protein complex supercharging from aqueous solution is primarily due to partial or significant unfolding that occurs as a result of chemical and/or thermal denaturation induced by the supercharging reagent late in the ESI droplet lifetime.     

Die Reinigung von AgCl

A method of removal of oxygen impurities and of colloidal silver from AgCl was developed, which made possible zone melting and crystal growth of AgCl in quartz ampullas. In addition the distribution coefficient of Mg in crystallizing AgCl from melts was estimated.     

On the nature of calomel vapour

The nature of vapours above calomel up to temperatures of about 500°C was studied by means of absorption, especially in the mercury resonance line at 253.7 nm, what was used as an indication of mercury in the vapour. It was proved that mercury(I) chloride vapour decomposes partially to mercury and mercury(II) chloride only due to impurities. On the contrary, the vapour above calomel of a sufficient purity does not decompose to the mentioned components in the whole temperature range.     

Distribution of Pb2+ ions in KCl single crystals grown by bridgman method

Basing on the Pb²⁺ concentrations in the ”︁pure”︁ ends of single KCl crystals, at various dopant concentrations in the original melts, as well as on the Pb²⁺ concentrations along the crystals, the distribution coefficient of the dopant ions is estimated. The origin of possible deviations of experimental data from those calculated according to eq. (1) is discussed and the neccessity of introducing an appropriate correction factor is pointed out (eq. (2)).