ALAMGIR taj

The essential steps of the sulfur cycleare:Militifilftthiif•Mineralization of organic sulfur to the inorganic form, hydrogen sulfide, H2S.•Oxidation of sulfide and elemental sulfur (S) and related compounds to sulfate, SO42–.•Reduction of sulfate to sulfide.Mibilibilitifthlfdd•Microbial immobilization of the sulfur compounds and subsequent incorporation into the organic form of sulfu These are often termed as follows: Assimilative Assimilative sulfate reduction sulfate reduction (sulfur assimilation) (sulfur assimilation) in which in which sulfate (SO42–) is reduced  to organic  sulfhydryl  groups  (R–SH) by  plants, fungi and prokaryotes.  The oxidation states of sulfur are +6 in sulfate and –2 in R–SH. Desulfuration and  Dissimilative sulfur  reduction in which or g ganic molecules containing sulfur can be desulfurated, producing H2S. Note the similarity  to deamination. Oxidation of hydrogen sulfide produces elemental sulfur (So), oxidat...

GENERAL  CONSIDERATIONS As DNA is a genetic material, it carries genetic informations from cell to cell and from generation to generation. At this stage, an attempt will be made to determine that in what manner the genetic informations are existed in DNA molecule ? Are they written in articulated or coded language on DNA molecule? If in the language of codes, what is the nature of genetic code ? A DNA molecule is composed of three kinds of moieties: (i) phosphoric acid, (ii) deoxyribose sugar, and (iii) nitrogen bases. The genetic informations may be written in any one of the three moieties of DNA. But the poly-sugarphosphate backbone is always the same, and it is therefore unlikely that these moiteies of DNA molecule carry the genetic informations.  The nitrogen bases, however, vary from one segment of DNA  to another, so the informations might well depend on their sequences.  The sequences of nitrogen bases of a given segment of DNA molecule, actually has been fou...