During the purification of an aquarium for carp breeding, a relatively high level of chemical oxygen demand (COD) was removed by filtration systems packed with both alginate- and polyvinyl alcohol (PVA)-immobilized gel beads of Rhodobacter sphaeroides S. Low nitrate accumulation was observed in the alginate gel beads packed system due to denitrification, but high levels of nitrate and nitrite a...

A facile method to prepare a polar stationary phase for hydrophilic interaction chromatography (HILIC) was proposed by coating polyvinyl alcohol onto silica particles (PVA-Sil). A water or organic solvent-insoluble permanent PVA coating on the silica particle surface can be formed simply by dipping silica particles into a hot PVA solution and then settled from this solution, leaving a thin laye...

the present work investigated the preparation of biodegradable beads with alginate polymer by ionotropic gelation method to improve the control release properties of the antibiotic rifampicin. ionotropic gelation method was applied to prepare beads using calcium chloride (cacl2) as cationic component and alginate as an anionic component. in this method, adding 0.5% w/v polyvinyl alcohol (pva) t...

We demonstrated ultrathin foldable organic light-emitting diodes (OLEDs) by using dielectric-metal-dielectric (DMD) electrode and polyvinyl alcohol (PVA) substrate. The DMD containing a thin metal layer suppresses waveguide mode formation help efficiency improvement, the spin-coated PVA film forms an substrate for OLEDs ~ 1 μm.

A new electrophilic polymer, 2,4-dinitrophenyl ether of polyvinyl alcohol (PVA-DNP), having a degree substitution 0.5 was prepared from (PVA) and 1-fluro-2,4-dinitrobenzene (DNFB). The PVA-DNP polymer characterized by NMR, IR, UV-visible spectroscopy. reaction with sodium methoxide followed NMR Evidence bound spirocyclic SIGMA complex, C-1 C-3 DNP-methoxy complexes the formation methoxy complex...

Photoactive polyvinyl alcohol hydrogels (PVA) have been investigated for use as tissue engineering scaffolds. These materials allow in situ polymerization for minimally invasive implantation methods. The mechanical properties of these materials can be tailored for a variety of soft tissue applications. The Young's modulus and ultimate tensile strength of PVA hydrogels are increased with increas...

Oxidized polyvinyl alcohol hydrolase (OPH) and polyvinyl alcohol dehydrogenase were found to be constitutively present in the periplasm of Sphingomonas sp. strain 113P3 (formerly Pseudomonas sp. 113P3). The OPH was purified to homogeneity with a yield of 40 % and a 5.9-fold increase in specific activity. The enzyme was a homodimer consisting of 35 kDa subunits. Its activity was inhibited by PMS...

In this work, we study and report the phase behavior of mixture lauric acid (LA) stearic (SA) inside polyvinyl alcohol (PVA)–polydimethylsiloxane (PDMS) nanofibrous mats woven using electrospinning technique.

A series of new nonionic antimicrobial polymers with a biodegradable polyvinyl alcohol (PVA) backbone grafted indole units and different hydrophobic alkyl or ether groups were synthesized by facile esterification.

From several polyvinyl alcohol (PVA)-utilizing mixed cultures, two component bacterial strains essential for PVA utilization were isolated, and their properties and roles in PVA utilization were studied. Each pair of essential component strains consisted of a type I strain, which produced a PVA-degrading enzyme and constituted the predominant population of the mixed culture in PVA, and a type I...