Experimental observation of a photonic hook

Applied Physics Letters journal paper entitled "Experimental observation of a photonic hook".Other funders supporting this work in addition to EC Grant 737164: Russian Science Foundation, Project No. 17-79-20346. , Ser Cymru National Research Network (NRNF66), Tomsk Polytechnic University Competitiveness Enhancement Program

Distinguishing regional from within-codon rate heterogeneity in DNA sequence alignments

We present an improved phylogenetic factorial hidden Markov model (FHMM) for detecting two types of mosaic structures in DNA sequence alignments, related to (1) recombination and (2) rate heterogeneity. The focus of the present work is on improving the modelling of the latter aspect. Earlier papers have modelled different degrees of rate heterogeneity with separate hidden states of the FHMM. This approach fails to appreciate the intrinsic difference between two types of rate heterogeneity: long-range regional effects, which are potentially related to differences in the selective pressure, and the short-term periodic patterns within the codons, which merely capture the signature of the genetic code. We propose an improved model that explicitly distinguishes between these two effects, and we assess its performance on a set of simulated DNA sequence alignments

Vanadium (IV), (V) coordination compounds with 8-hydroxyquinoline derivative: Synthesis, structure and catalytic activity in the polymerization of ethylene

A series of oxovanadium (IV, V) complexes stabilized by [OON]2- type ligand - 7- (hexafluoro-2-hydroxypropane-2-yl)-8-hydroxyquinoline (2), have been synthesized in high yields; the structures were confirmed by NMR, EPR, and IR spectroscopy, mass spectrometry, X-ray diffraction and elemental analysis. Depending on reaction conditions di-, tetra- or hexanuclear complexes 3-5 were obtained. It was demonstrated that in the presence of Et2AlCl/CCl3CO2Et, vanadium (V) complexes catalyzed polymerization of ethylene with activities up to 1000 kg of PE (mol of V)-1 h-1 atm-1. © 2015 Published by Elsevier B.V

Vanadium (IV), (V) coordination compounds with 8-hydroxyquinoline derivative: Synthesis, structure and catalytic activity in the polymerization of ethylene

A series of oxovanadium (IV, V) complexes stabilized by [OON]2- type ligand - 7- (hexafluoro-2-hydroxypropane-2-yl)-8-hydroxyquinoline (2), have been synthesized in high yields; the structures were confirmed by NMR, EPR, and IR spectroscopy, mass spectrometry, X-ray diffraction and elemental analysis. Depending on reaction conditions di-, tetra- or hexanuclear complexes 3-5 were obtained. It was demonstrated that in the presence of Et2AlCl/CCl3CO2Et, vanadium (V) complexes catalyzed polymerization of ethylene with activities up to 1000 kg of PE (mol of V)-1 h-1 atm-1. © 2015 Published by Elsevier B.V

Anion mediated switching from mono- to polymer structure in copper(II) complexes with 4,6-dimethylpyrimidinylhydrazone 1-phenyl-3-methyl-4-formylpyrazol-5-one

The novel hetarylhydrazone (H2L) has been synthesized by condensation of 2-hydrazino-4,6-dimethylpyrimidine with 1-phenyl-3-methyl-4-formylpyrazol-5-one and its complexes with CuCl2 and Cu(ClO4)2 have been obtained. The structures of the compounds were studied by means of NMR, IR, ESR spectroscopy, magnetic susceptibility measurements and X-Ray diffraction methods. The quantum-chemical modelling of the geometry and electronic structure of the hetarylhydrazone's tautomers has been carried out. The influence of the nature of acido-ligand on the structure of complex compounds has been established. Copper(II) chloride gives mono-nuclear complex [Cu(H2L)Cl2].H2O, while copper(II) perchlorate yields the polymeric structure ([Cu(HL)(CH3OH)]ClO4)n. For polymer compound no magnetic exchange interactions were detected. © 2019 Elsevier B.V