The photolyase enzyme absorbs blue light to repair damaged DNA through a cyclic electron transfer reaction. A description of the underlying mechanism has proven to be a challenging issue for both experimental and theoretical studies. In the present work, combined CASPT2//CASSCF/AMBER (QM/MM) calculations have been performed for damaged DNA in photolyase. A proton-coupled electron transfer (PCET...

We present here a detailed analysis of the mechanism of photoinduced electron and proton transfer in the planar pyrrole-pyridine hydrogen-bonded system, a model for the photochemistry of hydrogen bonds in DNA base pairs. Two different crossings, an avoided crossing and a conical intersection, are the key steps for forward and backward electron and proton transfer providing to the system photost...

The extraordinary properties of resonant fourwave mixing of backward and ordinary electromagnetic waves in doped negative-index materials are investigated. The feasibility of independent engineering of the negative refractive index and the nonlinear optical response as well as quantum control of the nonlinear propagation process in such composites is shown due to the coherent energy transfer fr...

We model a backward mirrorless optical parametric oscillator in a fragmented GaN waveguide consisting of a sequence of submicronic periodically poled elements separated by uniformly polarized connection sections representing stitching errors. We find that the generated coherent phase of the backscattered wave locks the phases of the forward propagating waves in such a way that the dynamics is n...

The objective of this project is to implement the recursive auto encoder (RAE) method to learn a model to predict sentiments for sentences and reproduce the result in [1]. To learn the weights for recursive functions, we implement forward and backward propagation algorithms. We validate the gradient computed from forward and backward algorithm by comparing it to the gradient computed from numer...

My experience related in this article is based on work in a county where there are schools of all sizes. It is agreed that educational backwardness should be tackled in the Junior school; the question is how this can be done in a county area. In the town where there are Junior and Infant schools of 200 or 300 children it is possible to run backward classes of 20-25 children in each Junior depar...

It is shown that owing to a dominance of np−pair transfer mechanism of backward elastic p Hescattering for incident proton kinetic energies Tp > 1 GeV the cross section of this process is defined mainly by the values of the Faddeev component of the wave function of He nucleus, φ(q23,p1), at high relative momenta q23 > 0.6GeV/c of the NN-pair in the S0− state and at low spectator momenta p1 ∼ 0−...