Materials Literature
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The crystal structure of an osmotically inducible protein (OsmC) from Escherichia coli has been determined at 2.4 A resolution. OsmC is a representative protein of the OsmC sequence family, which is composed of three sequence subfamilies. The structure of OsmC provides a view of a salt-shock-induced protein. Two ident…
Divergent evolution of enzyme function is commonly explained by a gene duplication event followed by mutational changes that allow the protein encoded by the copy to acquire a new function. An alternate hypothesis is that this process is facilitated when the progenitor enzyme acquires a second function while maintaini…
An Fe(II) ion at an α-cation exchange position of ferrierite, (Fe) α, was taken as a model for the active site in nitrous oxide decomposition and in the selective oxidation of phenol with nitrous oxide. The oxygen that is deposited via the decomposition of N 2 O is commonly referred to as α-oxygen, (O) α . Comparison…
Polystyerene (PS) nanocomposite foams were prepared using CO 2 supercritical fluid (SCF) as a solvent and blowing agent. PS was first in situ polymerized with 0, 1, and 3% Montmorillonite-Layered Silicate (MLS) mixtures, which were then compression-molded into thin laminates. The laminates were foamed in a batch proce…
We recently introduced a new technique for semiconductor nanoparticle research that involves simultaneous single molecule spectroscopy (SMS) and controllable oxidation/reduction in an electronic device. This paper shows that the new technique, denoted by fluorescence-voltage single molecule spectroscopy (F−V/SMS), is…
Politicizing Science provide a valuable insight into the competing interests of science and policymakers, says Ian Gibson.Karl Popper, probably the leading 20 th century philosopher of science, famously divided science into two steps: the formation of a hypothesis followed by its testing.But what happens when science…
Insulation performance of extruded polystyrene (XPS) foams expanded with various halogenated blowing agents including HFC-134a or HCFC-142b was measured over time. Residual blowing agents were measured after aging up to 26 years. The diffusive transport properties of the blowing agents can be determined through the ma…
PilT is a biological motor required for the retraction of bacterial type IV pili. Nesseria gonorrhoeae PilT has been purified and its ultrastructure has been examined by freeze-etch electron microscopy, revealing a 115 A outer diameter, 15-35 A inner diameter ring. Aquifex aeolicus PilT crystals were obtained in a pri…
This paper investigates the adsorption of bovine serum albumin (BSA) and bovine hemoglobin (BHb) model proteins onto novel thymine-functionalized polystyrene (PS-VBT) microspheres, in comparison with polystyrene (PS) microspheres. Maximum adsorption was obtained for both proteins near their corresponding isoelectric p…
The polarization of a nearest-neighbor (nn) Pb-O vacancy pair $[{(V}_{\mathrm{Pb}}\ensuremath{-}{V}_{\mathrm{O}}{)}_{\mathrm{nn}}]$ in ${\mathrm{PbTiO}}_{3}$ is calculated, using the modern theory of polarization, implemented in the density-functional-theory ultrasoft pseudopotential formalism. The dipole moment per d…
We show that aromatic amino acids on aggregated and immobilized Ag nanocrystals degrade upon laser illumination ( λ = 514.5 nm). Surface-enhanced Raman scattering (SERS) data, using tyrosine as the precursor, point to a linear one-photon induced reaction. This interpretation is supported by ab initio calculations of t…
Abstract In this paper the effect of several parameters, such as temperature, time of immersion, cerium ions and hydrogen peroxide concentration, pH of the conversion solution, on the composition and morphology of the conversion layer are investigated as well as on its corrosion resistance in chloride environments. Th…
The review covers those flame retardants (combustion modifiers) which are in commercial use or which have had active development leading to potential commercial use in polyurethanes and isocyanurates, with emphasis on foams but brief coverage of elastomers and coatings. The review also covers factors such as polyol ch…
Abstract Preparation of hyperdeproteinized natural rubber was made from fresh latex and preserved high‐ammonia latex by treatment with urea in the presence of sodium dodecyl sulfate. Concentration of urea, temperature, and time for the incubation were investigated to remove the proteins effectively. Under the best con…
Here we describe the synthesis of Au nanorods directly on glass surfaces using seed-mediated deposition of Au from AuCl4- onto surface-attached 3-5 nm diameter Au nanoparticles (AuNPs) in the presence of cetyltrimethylammonium bromide (CTAB). The average length (200 nm to 1.2 microm) and aspect ratio (6-22) of the nan…
The influence of various standard (ASTM, ISO) and experimental moisture conditioning methods on mechanical performance of injection molded nylon 6 is discussed as a result of an in-depth, comprehensive investigation. These methods covered a wide range for two basic process parameters for conditioning: temperature (fro…
We carried out classical atomistic studies of crack propagation in fully three-dimensional nanocrystalline $\ensuremath{\alpha}$-Fe (body-centered cubic structure) to examine the influence of temperature and average grain size on the fracture mechanisms and properties. Digital samples with grain sizes ranging from 6 t…
We present a summary of recent studies of the interface properties of interfaces that are formed between well-established molecular organic semiconductors and various metals. The energy level alignment, the formation of interface dipoles, a possible band bending and interactions at the interfaces have been investigate…
The thermally induced phase transition of the poly(N-isopropylacrylamide) (PNIPAM) brush covalently bound to the surface of the gold nanoparticles was studied using high-sensitivity microcalorimetry. Two types of PNIPAM monolayer protected clusters (MPCs) of gold nanoparticles were employed, denoted as the cumyl- and…
Polynuclear copper(I) complexes with bridging bis(dicyclohexylphosphino)methane (dcpm) and iodide ligands, [Cu(2)(dcpm)(2)(CH(3)CN)(2)](BF(4))(2) (1), [Cu(2)(dcpm)(2)](BF(4))(2) (2), [(CuI)(3)(dcpm)(2)] (3), [(CuI)(4)(dcpm)(2)] (4), and [(CuI)(2)(dcpm)(2)] (5) were prepared and their structures determined by X-ray cry…