In the present work, first data on catalytic activity of d-metal complexes petroleum porphyrins obtained via two-stage re-metallization (acid demetallization with subsequent metalation) high-purity vanadyl are presented. During acid porphyrins, highest yield (49%) and spectral purity free petroporphyrin bases were achieved concentrated sulfuric a diluted solution in chloroform. series divalent ...

When the Mn(2+) and Ca(2+) ions normally present in concanavalin A are removed, the protein becomes incapable of binding saccharides. To explore the structural differences between the native and demetallized forms and their effects on the saccharide-binding properties of the protein, we have refined and compared the crystal structures of both forms. Refinement, carried out by automated differen...

Ультрадлинные углеродные нанотрубки (УНТ) обладают чрезвычайно высоким аспектным соотношением и благодаря своим уникальным физико-механическим электрофизическим свойствам вызывают повышенный интерес для использования в сенсорах, химических источниках тока, качестве наполнителей нанокомпозитов т. д. Одним из методов синтеза ультрадлинных УНТ является каталитическое химическое осаждение парогазов...

The well-known probiotic GRAS Saccharomyces boulardii (CNCM I-745) was used for the first time to produce glutathione (GSH). culture conditions affecting GSH biosynthesis were screened using a Plackett–Burman design (PBD). Analyzing regression coefficients 12 tested variables, yeast extract, glucose, peptone, cysteine, temperature and agitation rate had positive significant effect on production...

An isolate from polluted soil identified as Aspergillus sp. MS-100 was able to consume vanadium oxide octaethyl porphyrin as a model for protoporphyrins in crude oil. The isolate degrades about 55% of vanadium oxide octaethyl porphyrin (VOOEP) under optimum conditions during 7 days. The release of more than 0.96 mgl-1 of free vanadium into the aqueous phase was confirmed using atomic absorption...