Materials Literature
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Autogenous vein and arterial grafts, such as great saphenous veins and internal mammary and radial arteries, remain the gold standard conduits for vascular reconstruction. Expanded polytetrafluoroethylene (PTFE) grafts, which exhibit little inflammatory and thrombogenic reactivity, are the most commonly used material…
Studies of the combustion processes in the Ti-H, Zr-H, and Ti-Zr-H systems made it possible to develop a principally new method for producing refractory metal alloys through the compaction of a titanium hydride-zirconium hydride powder mixture followed by dehydrogenation. The procedure is briefly described. Experiment…
This paper presents some of the main parameters in the behaviour pattern of young people in their binge drinking practices, seeking to improve the somewhat inaccurate view emerging from field studies. A total of 4083 questionnaires were administered to young people in Valencia aged 14-25 during the academic year 2005/…
Abstract We employ the spin‐polarized, full potential linearized augmented plane wave (FLAPW) method within generalized gradient approximation (GGA) to study the electriconic and magnetic properties of Al 1–x Mn x Sb (x = 0.25, 0.50, 0.75, and 1.0). We find that Al 1–x Mn x Sb is a half metal ferromagnet. The Fermi le…
Films consisting of oriented carbon nanotubes (CNTs) are synthesized by thermal decomposition of a carboniferous compound + ferrocene mixture and studied by scanning electron microscopy. It is shown that the thickness and structure of the films depend on the synthesis conditions, specifically, on the way the reaction…
We report a new chemical reaction between Mg(NH 2 ) 2 and LiAlH 4 in a molar ratio of 1/1, which releases 8 equiv of H under moderate conditions. X-ray diffraction, Fourier transform infrared spectroscopy, and NMR measurements revealed that an Al−N bond was established right after the occurrence of the reaction. Nitri…
PMNT single crystals in the relaxor-ferroelectric lead magnesium niobate (PMN)-lead titanate (PT) system provide significant advantage for underwater sonar transducers. Compared to lead zirconate titanate (PZT) ceramics, the large electromechanical coupling factor provides significant increases in transducer bandwidth…
The electrical conduction behavior of undoped ultrananocrystalline diamond (UNCD) and its dependence on deposition temperature and chemical structure are presented. UNCD films were grown using a microwave plasma-enhanced chemical vapor deposition technique at deposition temperatures of 400 °C and 800 °C. The chemical…
The band origins and transitions of weak vibrational modes developed in the 3500 cm(-1) region of polylactide (PLA) spectra during crystallization are investigated. The band assignment to the OH stretching mode of terminal hydroxyls is unlikely because the trace amount of chain-ends is negligible considering the long…
Abstract Exceptionally strong materials could be synthesized by filled polyolefins with nanosized, regid particles or fibers. Metallocene catalysts are excellent tools in the production of tailored microstructures as well as tacticities of polypropylenes. They are soluble in hydrocarbons and therefore can cover perfec…
The nonlinear absorption of two porphyrin diacids (H4TPP2+ and H2DSP2+), the diprotonated forms of free base tetraphenylporphyrin (H2TPP) and dithiaporphyrin (DSP), were studied in the wavelength range of 500-650 nm. The two porphyrin diacids exhibited perturbed static and dynamic characteristics and enhanced nonlinea…
The FTIR and laser Raman spectra of 2-hydroxy-5-methyl-3-nitro pyridine have been recorded in the region 4000-400 cm -1 and 4000-50 cm -1 , respectively. Both the spectra have been analyzed on the basis of Cs point group symmetry and the observed bands have been assigned to the different specific modes of vibrations.…
Nanocrystalline diamond (NCD) has recently been successfully utilized in a variety of life science applications. NCD films are favorable and salubrious substrates for cells during cultivation. Therefore NCD has also been employed in tissue engineering strategies. NCD as reported in this contribution was grown by means…
Minghao Gua, Jun Zhanga*, Ying Xiaa & Xiaolin Wangb a College of Materials Science and Engineering, Nanjing University of Technology , Nanjing, China b Department of Chemical Engineering , Tsinghua University , Beijing, China * College of Materials Science and Engineering, Nanjing University of Technology, Nanjing, 21…
Great Smoky Mountains National Park, which straddles the Tennessee–North Carolina state-line is a biologically diverse region which has recently become the site of an All Taxon Biodiversity Inventory, an effort to chronicle species diversity by documenting all species in all phyla present within park boundaries. As a…
The regulation of phosphoribulokinase (PRK) and glyceraldehyde 3‐phosphate dehydrogenase (GAPDH) was investigated in a freshwater pennate diatom, Asterionella formosa Hassall, and compared to the well‐studied chlorophyte Chlamydomonas reinhardtii P. A. Dang. As has been reported for a marine centric diatom, in A. form…
A new concept for the external control of protein activity is presented and demonstrated on the example of an artificial Lysozyme switch. Radical copolymerization of selected methacrylamide-based comonomer units tailored for amino acid residues surrounding the active site furnishes polymeric protein hosts that are abl…
Diatoms and other algae were collected and identified from subaerial habitats (wetwalls) in Great Smoky Mountains National Park as part of a larger biodiversity survey of the Park. Algal collections were made across a range of moisture gradients and bedrock mineralogies with pH ranging from 3.8 to 7.7. None of the com…
Abstract In this study, poly(vinyl alcohol) were cross-linked with boron in varying concentrations and blend fibers were obtained with diameters ranging from 0.3 μ to 4.0 μm with the use of electrospinning process. The resulting product was characterized by SEM, DSC, and FT-IR techniques. There is no beading tendency…
A novel approach to property enhancement of poly( l -lactic acid) (PLLA) through the use of perfluoropolyether (PFPE) enchainment is described. Segmented copolymers (FluoroPLA) exhibit tailored surface properties with reasonably high molecular weights and low polydispersities compared to PLLA alone using standard ring…