ELECTRON-DONOR AND -ACCEPTOR PROPERTIES OF BIOLOGICALLY IMPORTANT PURINES, PYRIMIDINES, PTERIDINES, FLAVINS, AND AROMATIC AMINO ACIDS

Partition Coefficients of Biologically Important Pyrimidines and Purines [1]

Distribution (partition) of an organic substance between two liquid phases, usually water and an or­ ganic solvent, plays an important role in extraction, partition chromatography, and various other separa­ tion processes used in many areas of chemistry. Partition (distribution) coefficient, P, which is the quantity used to characterize the distribution of a solute between two immiscible solven...

Nucleotide Metabolism – Purines and Pyrimidines

Nucleotide metabolism results in the synthesis of the four nucleotides that form DNA. These are further divided in two categories: purines and pyrimidines. Their construction and degradation takes place in a progression of single steps, while different enzymes and cofactors are involved in the process. Beside degradation, there is also a form of reprocessing purine and pyrimidine nucleotides, d...

Receptors for purines and pyrimidines.

Classification of the mechanisms of photoinduced electron transfer from aromatic amino acids to the excited flavins in flavoproteins.

In many flavoproteins photoinduced electron transfer (ET) efficiently takes place from aromatic amino acids such as tryptophan or tyrosine to the excited isoalloxazine, so that the fluorescence lifetimes of isoalloxazine in some flavoproteins become ultrashort. The mechanism of ET in the flavoproteins was classified into four classes from the relationship between logarithmic ET rates (ln Rate) ...

Nucleotide Metabolism – Purines and Pyrimidines

Nucleotide metabolism results in the synthesis of the four nucleotides that form DNA. These are further divided in two categories: purines and pyrimidines. Their construction and degradation takes place in a progression of single steps, while different enzymes and cofactors are involved in the process. Beside degradation, there is also a form of reprocessing purine and pyrimidine nucleotides, d...