We demonstrate an optically active nanotube-hybrid material by functionalizing single-wall nanotubes with an azo-based chromophore. Upon UV illumination, the conjugated chromophore undergoes a cis-trans isomerization leading to a charge redistribution near the nanotube. This charge redistribution changes the local electrostatic environment, shifting the threshold voltage and increasing the cond...

The fragmentation times corresponding to the loss of the chromophore (Cα-Cβ bond dissociation channel) after photoexcitation at 263 nm have been investigated for several small peptides containing tryptophan or tyrosine. For tryptophan-containing peptides, the aromatic chromophore is lost as an ionic fragment (m/z 130), and the fragmentation time increases with the mass of the neutral fragment. ...

The molecular orientation in amphiphilic hemicyanine Langmuir-Blodgett (LB) films has been studied quantitatively by Fourier transform infrared (FTIR) spectroscopy and second harmonic generation (SHG). From the analysis of transmission and reflection absorption (RA) spectra of FTIR, the tilt angles to the surface normal of the hydrocarbon chain axis and the chromophore of amphiphilic hemicyanin...

substance was also hydrolyzed lvith acid to split vinyl ethers (13). The products were partitioned between ether and water and cr-glycols determined in each phase. Saponification released considerable amounts of glycerol (Table I, 3b). Thus Eluate C1 from the silicic acid column apparently still contained some ester triglycerides. The ether-soluble fraction contained glycols which yielded on ac...

Interaction of molecular oxygen 3O2 with the flavin-dependent protein miniSOG after light illumination results in creation singlet 1O2 and superoxide O2●−. Despite recently resolved crystal structures variants, oxygen-binding sites near flavin chromophore are poorly characterized. We report computational studies protein−oxygen systems using dynamics (MD) simulations force-field interaction pote...

Measuring optical spectra of chromophore molecules entrapped in liposomes can lead to considerable distortion because of absorption flattening. This phenomenon is analyzed theoretically, and it is shown that the deviation from the Beer-Lambert law becomes larger as the molar absorptivity of the chromophore increases and as the number of entrapped molecules becomes larger. The theoretical equati...