In the present study, a series of aliphatic polyesters based on succinic acid and several diols with 2, 4, 6, 8, 10 methylene groups, namely poly(ethylene succinate) (PESu), poly(butylene (PBSu), poly(hexylene (PHSu), poly(octylene (POSu), poly(decylene (PDeSu), were prepared via two-stage melt polycondensation method. All semicrystalline materials Tm ranging from 64.2 to 117.8 °C, while their ...

The influence of cooperativity on conformational changes in biopolymers has been extensively studied both experimentally and theoretically.' Nevertheless relatively small attention has been paid to the existence of hysteresis cycles in some of these transitions. This might be due to the fact that non-reversible transitions are rather suspicious to many scientists. It is the merit of Aharon Katc...

The genomic RNAs 1 and 2 of the NW isolate of the Arabis mosaic nepovirus were polyguanylated and amplified by RT-PCR, to determine the lengths of their poly(A) tails. Primers specific of ArMV-NW RNAs 1 or 2 were used in combination with a primer designed to hybridize at the junction poly(A)-poly(G) introduced at the end of the poly(A) tail during the polyguanylation procedure of the viral RNAs...

A new graft copolymer, poly(2-hydroxyethyl methacrylate-co-styrene) -graft-poly( -caprolactone), was prepared by combination of reversible addition-fragmentation chain transfer polymerization (RAFT) with coordination-insertion ringopening polymerization (ROP). The copolymerization of styrene (St) and 2-hydroxyethyl methacrylate (HEMA) was carried out at 60 °C in the presence of 2-phenylprop-2-y...

We report here on the segment effects of poly(ethylene oxide)-containing block copolymers (PEO-BCP) on the reduction activity for tetrachloride gold(III) ([AuCl(4)](-)), interfacial activity for gold surface, colloidal stability, and morphology of gold nanoparticles formed in aqueous solutions. In particular, the effects of poly(ethylene oxide) (PEO), poly(propylene oxide) (PPO), polyethylene (...

The asymmetric unit of the polymeric title salt, [Cs(C(6)H(4)NO(3))](n), comprises a Cs(+) cation and a 6-oxidopyridinium-2-carboxyl-ate anion. The Cs(+) cation is six-coordinated by O atoms derived from two oxido and four carboxyl-ate O atoms; each O atom in the anion bridges two Cs(+) cations. In the crystal, inter-molecular N-H⋯O hydrogen bonding is present and contributes to the stability o...

Pre-messenger RNA (mRNA) 3'-end cleavage and subsequent polyadenylation strongly regulate gene expression. In comparison with the upstream or downstream motifs, relatively little is known about the feature differences of polyadenylation [poly(A)] sites among major kingdoms. We suspect that the precise poly(A) sites are very selective, and we therefore mapped mRNA poly(A) sites on complete and n...

The role of cobalt(II) complexes containing 2-formylpyrrolyl chelating ligands and phosphine ligands combined with a bromo-alkyl ester, an alkyl bromide or an azo compound in the formation of suitable initiator systems for vinyl monomer controlled radical polymerization was studied. The formation of syndiotactic-rich (Pr>0.7) poly(methyl methacrylate) (PMMA) and atactic (Pr=0.49) poly(styrene) ...