This paper describes the syntheses of core/shell gold nanoparticles stabilized with a monolayer of double hydrophilic block copolymer and their stimuli responsiveness before and after shell cross-linking. The hybrid nanoparticles consist of gold core, cross-linkable poly(2-(dimethylamino)ethyl methacrylate) (PDMA) inner shell, and poly(ethylene oxide) (PEO) corona. First, diblock copolymer PEO-...

Mutagen-sensitive strains that identify 16 different Drosophila genes have been screened for alterations in DNA metabolic enzymes. A characteristic defect in an acid-active deoxyribonuclease was observed in strains carrying the six available mutant alleles of the mus308 gene. Since that enzyme is detected at normal levels in a mutant strain that is deficient in the previously identified enzymes...

Background Context: In the United States, the most prevalent cause of disability of workers under 45 years of age is low back pain. Past research suggests that there is a link between low back pain and intervertebral disc degeneration. One of the earliest known components of disc degeneration is a decrease in proteoglycan content in the nucleus pulposus, which in turn leads to changes in mechan...

A new cross-linkable monomer containing 1,3-diphenylethenylcarbazolyl-based hole-transporting moieties and four reactive epoxy groups, was prepared by a multistep synthesis route from 1,3-bis(2,2-diphenylethenyl)-9H-carbazol-2-ol and its application for the in situ formation of cross-linked hole transporting layers was investigated. A high concentration of flexible aliphatic epoxy chains ensure...

The oxidative gelation of maize bran arabinoxylans (MBAX) using a peroxidase/H(2)O(2) system as a free radical-generating agent was investigated. The peroxidase/H(2)O(2) system led to the formation of dimers and trimer of ferulic acid as covalent cross-link structures in the MBAX network. MBAX gels at 4% (w/v) presented a storage modulus of 180 Pa. The structural parameters of MBAX gels were ca...

The adsorption of Pb (II) ions onto chitosan beads and cross-linked chitosan beads has been investigated. The epichlorohydrin (ECH) was used as a cross-linking agent. Experiments were carried out as a function of pH, stirring time, adsorbent dosage and concentration of Pb (II) ions. The experimental data of the adsorption equilibrium from Pb (II) solution correlated well with the Langmuir isoth...