The influence of poly(titanium oxide) obtained using the sol-gel method in 2-hydroxyethyl methacrylate medium on viscoelastic and thermophysical properties interpenetrating polymer networks (IPNs) based cross-linked polyurethane (PU) poly(hydroxyethyl methacrylate) (PHEMA) was studied. It found that both initial organo-inorganic (OI IPNs) have a two-phase structure by methods dynamic mechanical...

Every year, microbial contamination causes billions of tons food wasted and millions cases illness. ?-Poly- l -lysine has potent, wide-spectrum inhibitory activity is heat stable biodegradable. It been approved for preservation by an increasing number countries. produced from soil bacteria the genus Streptomyces , also producers various antibiotic drugs toxins not considered to be a naturally o...

4 Department of Botany, Howard University, Washington, DC, USA A pronase-sensitive, 14 kDa component of bacteroids of Bradyrhizobium japonicum 1-1 IOARS was identified and characterized using monoclonal antibodies. This component was weakly synthesized or was missing in bacteroids of a unique Nod+ Fixmutant, ARS2525. Both the 14 kDa component and poly-/?-hydroxybutyrate (PHB) were located in th...

poly(vinyl acetate) is synthesized via solution polymerization, and then it is converted to poly(vinyl alcohol) by alkaline alcoholysis. the aim of the work study was to investigate statistically the  influence of reaction variables in vinyl acetate polymerization, the conversion of this monomer to polymer, degree of branching of acetyl group in poly(vinyl acetate), as well as the molecular wei...

thermodynamic study on the interaction of β-cd with poly ethylene oxide and poly acrylic acid was performed by isothermal titration calorimetry at 298k. when β-cd is added to the interpolymer complex, competition is created between host-guest and hydrogen bond. enthalpy of interaction between the β-cd and interpolymer complex was calculated using the extended solvation theory. p=1 shows that wi...

in this research, hydrogels based on poly vinyl alcohol and poly acrylic acid blend were prepared which were cross-linked by applied thermal conditions. afterward, effects of time and heating on water uptake were investigated. the highest water uptake value exhibited by the sample that was heated for 20 min. at 110 ºc was about 2129% after 4 days at equilibrium state. hydrogels exhibited ph-sen...

Partitioning oracles were introduced by Hassidim et al. (FOCS 2009) as a generic tool for constant-time algorithms. For any ε > 0, a partitioning oracle provides query access to a fixed partition of the input bounded-degree minor-free graph, in which every component has size poly(1/ε), and the number of edges removed is at most εn, where n is the number of vertices in the graph. However, the or...

Single-strand breaks are the commonest lesions arising in cells, and defects in their repair are implicated in neurodegenerative disease. One of the earliest events during single-strand break repair (SSBR) is the rapid synthesis of poly(ADP-ribose) (PAR) by poly(ADP-ribose) polymerase (PARP), followed by its rapid degradation by poly(ADP-ribose) glycohydrolase (PARG). While the synthesis of pol...

the nanocomposites of poly (acryl amide-co-acrylic acid) with different contents of naazeolite were prepared using ammonium persulfate as an initiator and n, n′-methylenebisacrylamide as the crosslinker. the morphology was characterized by sem and the structure ofnanocomposite materials was studied with xrd and ft-ir that showed the interaction betweenporous materials and poly (aam-co-aac). the...

Bilayer xerographic photoreceptors in which ^-conjugated polymers and binary conjugated polymer blends are used as the charge generation layer have been fabricated, evaluated, and shown to be highly efficient. Devices incorporating poly(l,4-phenylene benzobisthiazole), poly(2,5-pyridylene benzobisthiazole), poly(l,4-phenylenebisvinylene benzobisthiazole), poly(l,4-(2-hydroxy)phenylene benzobist...