Theory of Chromatographic Separation of Isotopes, (III)

The chromatographic separation of uroporphyrin I and III octamethyl esters.

Laser Separation of Isotopes

In nature most elements are mixtures of isotopes: they are made up of at­ oms that all have the same number of protons and electrons but that differ in number of neutrons. Ordinarily the fact that an element is a mixture of sev­ eral ·kinds of atoms matters little be­ cause the various isotopes are all but indistinguishable in most of their prop­ erties. For that very reason. however. when we d...

the analysis of the role of the speech acts theory in translating and dubbing hollywood films

از محوری ترین اثراتی که یک فیلم سینمایی ایجاد می کند دیالوگ هایی است که هنرپیش گان فیلم میگویند. به زعم یک فیلم ساز, یک شیوه متأثر نمودن مخاطب از اثر منظوره نیروی گفتارهای گوینده, مثل نیروی عاطفی, ترس آور, غم انگیز, هیجان انگیز و غیره, است. این مطالعه به بررسی این مسأله مبادرت کرده است که آیا نیروی فراگفتاری هنرپیش گان به مثابه ی اعمال گفتاری در پنج فیلم هالیوودی در نسخه های دوبله شده باز تولید...

Chromatographic separation of glycated nucleotides.

A high-performance liquid chromatographic method for the separation of nucleotide glycation reaction product(s) has been developed. The product(s) arising during in vitro glycation of a nucleotide (AMP, GMP or CMP) with a reducing sugar (ribose or glucose) were clearly resolved from the non-glycated constituents of the reaction mixture. The peak(s) of the glycated product(s) increased when an a...

Chromatographic Separation of the Diastereoisomers

Reduction of folic acid to the tetrahydro level introduces a second asymmetrical center into the molecule at carbon atom 6.1 The resulting tetrahydrofolate, and subsequent derivatives, prepared chemically consist of dl mixtures that are only 50% active in biological reactions. The need for fully reactive isomers of reduced folates led to the enzymatic synthesis of tetrahydrofolate from 7, %dihy...