Lumichrome is a photodegradation product of riboflavin and is available as a photosensitizer and fluorescent dye. To develop new efficient methods of lumichrome production, we isolated bacterial strains with high lumichrome productivity from soil. The strain with highest productivity was identified as Microbacterium sp. strain TPU 3598. Since this strain inductively produced lumichrome when cul...

In the atmosphere polluting agents are involved in different reactions which lead to secondary pollutants. Secondary pollutants are mainly generated by photochemical and thermal reactions. These reactions occur in the atmosphere and they generate photochemical smog. We studied the variations of primary and secondary pollutants concentrations by photochemical modeling systems. All the test probl...

We designed a hammerhead-type ribozyme system which consists of three RNA fragments and synthesized the component and related ribo-oligonucleotides by the solid-phase phosphoramidite method using o-nitrobenzyl groups for 2'-hydroxyl protection. Improved conditions for photolytic removal of the o-nitrobenzyl groups are described. Imino proton NMR spectra of the ribozyme complex were measured. Th...

We consider a mixture of a diatomic photolytic precursor AX and a reagent BC that undergoes the photoinitiated reaction AX+ hu+A+X followed by A+BC+AB+C. In the limit that AX is stationary relative to BC, we show that the threedimensional velocity distribution of the AB product in a specified quantum state can be related to the differential cross section of the A+BC reaction by a simple, invert...

Agomelatine is a melatonergic anti-depressant. A stability-indicating high performance liquid chromatographic technique was developed for the determination of Agomelatine in pharmaceutical formulations. Chromatographic separation was achieved on Shimadzu Model CBM-20A/20 Alite, using Zorbax extended-C18 column (150 × 4.6 mm i.d., 5 μm particle size) with a mixture of 0.1% ammonium formate and a...

Photoinduced mediated electron transfer to N-alkylpicolinium(NAP)-based esters has previously been shown to induce release of carboxylate anions. In this mechanism, electrons are shuttled between a good electron donor through a sensitizer/mediator to the NAP group which subsequently induces C-O bond cleavage. Previous studies have used UV-absorbing mediators to initiate substrate release with h...

Bipolar Ti02/Pt photoelectrodes were fabricated by anodization of thin Ti foils onto which Pt had been previously sputter-deposited. These photoelectrodes are capable of a vectorial charge transfer. Current-potential curves were used to predict the behavior of multielectrode arrays. Several different multielectrode cells, utilizing KOH, O2 electrolytes, were constructed. In series configuration...

The reactivity of the 2-phosphaethynolate anion (PCO(-)) towards a cyclic trisilene (cSi3(Tip)4) is reported. The result is the net activation of the P-C and Si-Si multiple bonds of the precursors affording a heteroatomic bicyclo[1.1.1]pentan-2-one analogue ([P(CO)Si3(Tip)4](-); 1). This reaction can be interpreted as the formal addition of a phosphide and a carbonyl across the Si-Si double bon...

The kinetics of the reactions of thiocarboxylate and thiocarbonate anions with benzhydrylium ions have been determined in acetonitrile solution using laser-flash photolytic techniques. The second-order rate constants (k) correlate linearly with the electrophilicity parameters E of the benzhydrylium ions, as required by the correlation log k (20 °C) = s(N)(N + E) (J. Am. Chem. Soc., 2001, 123, 9...