We studied the time-resolved fluorescence of isolated RC-LH1 complexes from Rhodopseudomonas palustris as a function of the photon fluence and the repetition rate of the excitation laser. Both parameters were varied systematically over 3 orders of magnitude. On the basis of a microstate description we developed a quantitative model for RC-LH1 and obtained very good agreement between experiments...

X-ray data indicate that complexes of ribosomes with cognate and near cognate tRNAs are very similar structurally, and this was the ground for a suggestion that the ribosome discriminates correct codon-anticodon pair because of its higher stability. Here an alternative explanation of kinetic proofreading is suggested, and intramolecular oscillations in tRNAs play a keystone role in it. Resonanc...

in present studies the synthesis, characterization and biological properties ofoxovanadium(iv) coordination compounds of 4[n-(4′-ethylbenzalidene)amino] antipyrinethiosemicarbazone (ebaapts) and 4[n-(2′,4′-dimethylbenzalidene)amino] antipyrinethiosemicarbazone (dmbaapts) with the general composition vox2l (x = c1-, br-, i-, no3-or ncs-) and vo(cio4)2(l)h2o (l = ebaapts or dmbaapts) are describe...

The theory of complexes of directed trees was initiated by Kozlov to answer a question by Stanley, and later on, results from the theory were used by Babson and Kozlov in their proof of the Lovász conjecture. We develop the theory and prove that complexes on directed acyclic graphs are shellable. A related concept is that of independence complexes: construct a simplicial complex on the vertex s...

an ultrasound-assisted surfactant-enhanced emulsification microextra- ction (uaseme) coupled with high performance liquid chromatography-diode array detection has been developed for the extraction and determination of thiopental in serum and urine samples. a simple microextraction method based on emulsification of organic extraction solvent in aqueous sample using an ionic surfactant and withou...

It has been well established that long range secondary electrostatic interactions (SEIs) have a significant effect on the stability of supramolecular complexes. However, general rules for exploiting SEIs in the rational design of diverse supramolecular complexes have been difficult to obtain. In this work, we outline a quantum chemical approach for understanding the strength of electrostatic in...

A key step in homologous recombination is the alignment and pairing of homologous DNAs. The Escherichia coli RecA protein initiates pairing by binding to single-strand DNA, forming a helical nucleoprotein filament. We demonstrate that in the presence of the nonhydrolyzable ATP analogue adenosine 5'-[gamma-thio]triphosphate and ADP, RecA can pair a homologous oligonucleotide 15 bases long with a...

We extend Hendriks’ classification theorem and Turaev’s realisation and splitting theorems for PD–complexes to the relative case of PD– pairs. The results for PD–complexes are recovered by restricting the results to the case of PD–pairs with empty boundary. Up to oriented homotopy equivalence, PD–pairs are classified by their fundamental triple consisting of the fundamental group system, the or...