Background and Aim: Minimizing the polymerization shrinkage of composite resins is a critical goals in composite restorations. Many factors affect polymerization shrinkage. This study aimed to evaluate the effect of composite resin shade on polymerization shrinkage. Materials and Methods: In this in vitro study, 14 composite discs measuring 1.5×8 mm were fabricated. The samples were prepared u...

Most surgeons seem to favour the former method. Even when the erisophake is used instead of forceps, the technique of zonulolotomy and delivery of the lens remains essentially the same. Since the introduction of A.C.T., however, mechanical zonulolotomy has been replaced by enzymatic zonulolysis and the extraction of the lens by seizing it at the 12 o'clock position is being increasingly practis...

Hydrogels are interesting materials for application in biomedicine due to their outstanding properties (e.g., water retention, drug release, and biocompatibility). This work evaluates two series of phosphorus-based hydrogels as potential wound-dressing candidates. The were synthesized via free-radical polymerization bis[2-(methacryloyloxy)ethyl] phosphate (BMEP, ≥75 wt %) with (3-acrylamidoprop...

In this contribution we describe the formation of gold nanoparticles (AuNP)and polyaniline (PANI) AuNP-PANI nanocomposite via in situ enzymaticpolymerization. The method consists electrostatic adsorption aniliniummonomers on AuNPs citrate stabilized surface 50 nm diameters, followedby oxidation with horseradish peroxidase (HRP) enzyme and its cofactorH2O2. All reaction steps were monitored by U...

DNA origami has been used to orchestrate reactions with nano-precision using a variety of biomolecules. Here, the dynamics of albumin-assisted, localized single-molecule DNA polymerization by terminal deoxynucleotidyl transferase on a 2D DNA origami are monitored using AFM in liquid. Direct visualization of the surface activity revealed the mechanics of growth.

Lignin is one of the most abundant biopolymers, and it has a complex racemic structure. It may be formed by a radical polymerization initiated by redox enzymes, but much remains unknown about the process, such as how molecules as large as enzymes can generate the compact structure of the lignified plant cell wall. We have synthesized lignin oligomers according to a new concept, in which peroxid...

a long-term study was conducted between 1985 and 2003 on rehabilitation trials at sishen ironore mine, south africa, to identify grass species that would survive in the artificial growth medium appliedto the sites, and to determine the most suitable medium for sustainable vegetation growth. vegetationestablishment was tested at slopes of 18° and 34° and with five different cover materials. afte...

Achievement of appropriate precision is a major challenge for the clinical laboratory, particularly in specialized fields such as enzymology and immunochemistry. Especially in immunochemistry, where accuracy can only poorly be checked because of a lack of reference methods and a multitude of detectable epitopes, precision remains an important index of quality. In immunochemical methods there ar...

11 HASSID and ABRAHAM, Chemical Procedures for Analysis of Polysaccharides, in: Methods of Enzymology, Vol . 3, Academic Press, New York 1957. 12 F. W. FALES, J. biol. Chemistry 193, 113 [1951] . 13 N. NELSON and M. SOMOGYI, as cited in Practical clinical B i o c h e m i s t r y , H . V A R L E Y , 4 t h e d i t i o n , W . HEINEMANN, Medical Book Ltd., London 1967. 14 O. FOLIN and H. Wu, as ci...

This review describes the life of Sir John Cornforth AC CBE FRS, who was awarded the Nobel Prize for Chemistry in 1975. It covers his early life in Australia, his work in Oxford, the National Institute for Medical Research, the Milstead Laboratory of Chemical Enzymology and the University of Sussex, together with the contributions made by his wife, Lady Rita Cornforth.