The reversible photoswitching of the photochromic fluorescent protein Padron0.9 involves a cis-trans isomerization of the chromophore. Both isomers are subjected to a protonation equilibrium between a neutral and a deprotonated form. The observed pH dependent absorption spectra require at least two protonating groups in the chromophore environment modulating its proton affinity. Using femtoseco...

3-D*aza-2'-d*ozycytidin* (d(3-d*azaC)) it a structural analogu* of 2'-d*ozycytidin* (dC) and was shown to react in a different manner as a S'-triphosphate [2] and at a template nucleotide [3] on in vitro polymerization. In thit connection the tautomeric equilibrium of d(3-d*azaC) with its imino-enol form was investigated by C-NMR spsctroscopy. Using solvents with gradually changing hydrmtion pr...

the srk two-parameter cubic equation of state has been used for the calculation of the equilibrium constant using the liquid and vapor fugacity coefficients for three binary mixtures. dew and bubble points have been determined using the equilibrium constants and the phase envelope has been plotted showing dearly that retrograde condenstaion occurs. the following percent deviations have been obt...

ABSTRACT. A series of 2-(4-substituted-phenylimino)thiazolidin-4-one compounds was synthesized via heterocyclizing the corresponding N-aryl-2-chloroacetamides with ammonium thiocyanate. Their chemical structures were elucidated based on an extensive analysis their spectroscopic data, including infrared, 1H NMR, 13C and mass analyses. The possible tautomeric forms thiazolidine-4-ones studied. ta...