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Rotational Mobility (rotational + mobility)

Distribution by Scientific Domains

Polymers and Materials Science	50%
Medical Sciences	50%

Selected Abstracts

Modified Single-Sling Myocutaneous Island Pedicle Flap: Series of 61 Reconstructions

DERMATOLOGIC SURGERY, Issue 11 2008
ANDREA WILLEY MD
BACKGROUND Bilevel undermining above and below the transverse nasalis muscle in the construction of a myocutaneous island pedicle flap produces a bilateral or unilateral muscular sling with exceptional vascular supply for reconstruction of defects on the distal nose. We present further modification of the single-sling myocutaneous island pedicle flap that expands its application to a wide variety of nasal defects and further defines its usefulness in nasal reconstruction. METHODS A series of 61 consecutive myocutaneous island pedicle flap reconstructions performed after Mohs surgery between March 2005 and July 2006 are presented. Flap modifications are presented, and advantages and limitations are discussed. RESULTS Flap modifications introduce additional reach and rotational mobility to the flap that permit extension of the flap to defects on the nasal tip and distal ala. CONCLUSION Modifications of the bilevel approach to the single-sling nasalis myocutaneous island pedicle flap further define its practicality in nasal reconstruction and expand its application to a variety of nasal defects. [source]

Crosslinkable maleimide copolymers for stable NLO properties

JOURNAL OF POLYMER SCIENCE (IN TWO SECTIONS), Issue 10 2001
. E. Serhatli
Abstract Second-order, nonlinear optical polymers based on epoxy-substituted methylvinylisocyanates and N -substituted maleimides were synthesized and characterized with spectral and thermal analysis. The photocrosslinking and thermal-crosslinking reactions of copolymers with different chromophore contents were studied. Thermally induced crosslinking during the poling process, performed at the glass-transition temperature (Tg), was prevented by Tg being decreased through the addition of a plasticizer. Electrooptic coefficients (r33), measured for crosslinked and noncrosslinked systems, had similar absolute values and relaxation dynamics. This behavior was explained in terms of the similar rotational mobility of the chromophore units and the paucity of crosslinking sites. © 2001 John Wiley & Sons, Inc. J Polym Sci A: Polym Chem 39: 1589,1595, 2001 [source]

A Proline-Threonine Substitution in Codon 351 of ADH1C Is Common in Native Americans

ALCOHOLISM, Issue 12 2002
Michael V. Osier
Background The alcohol dehydrogenase (ADH) genes have been repeatedly associated with protection against alcoholism. Until now, only four protein coding variants have been identified (ADH1C Arg271Gln, Ile349Val, ADH1B Arg47His, and Arg369Cys), and only two of these (ADH1C Ile349Val and ADH1B Arg47His) have been routinely tested in association studies with alcoholism. Methods The new ADH1C*351Thr allele was identified by direct sequencing of DNA samples that gave different typing results for the ADH1C Ile349Val polymorphism with different typing protocols. Results A new coding variant has been identified at codon 351 of ADH1C. This allele is found in most Native American populations that we have studied with allele frequencies of the new ADH1C*351Thr allele as high as 26%. Only two instances of this allele have been seen in a large survey of African and Eurasian populations. Conclusions The changes in charge, size, and rotational mobility caused by this amino acid substitution should be significant. Because this new variant codes for a new enzyme form in Native Americans, the kinetics of this enzyme should be studied and considered in studies of the role of ADH1C in the protection against alcoholism in Native Americans. [source]

EPR Analysis of n -Butyl Acrylate Radical Polymerization

MACROMOLECULAR RAPID COMMUNICATIONS, Issue 23 2009
Johannes Barth
Abstract Via electron paramagnetic resonance (EPR) spectroscopy, concentrations of secondary propagating radicals (SPRs) and tertiary mid-chain radicals (MCRs) in n -butyl acrylate solution polymerization were measured. The EPR spectrum is dominated by the 4-line spectrum of SPRs at ,50,°C and by the 7-line spectrum of MCRs at +70,°C. At intermediate temperatures, a third spectral component is seen, which is assigned to an MCR species with restricted rotational mobility. The MCR components are produced by 1,5-hydrogen shift (backbiting) of SPRs. The measured ratio of MCRs to SPRs allows for estimating the rate coefficient k for monomer addition to a mid-chain radical. For 70,°C, k is obtained to be 65.5 L,·,mol,1,·,s,1. [source]