Materials Literature
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ABSTRACT The effects of drying temperature, drying relative humidity and film thickness on the drying characteristics, water vapor permeability, and tensile properties of glycerol (Gly)‐plasticized whey protein isolate (WPI) films were investigated. 50%WPI:50%Gly and 60%WPI:40%Gly (dry basis) films were studied. Const…
The modulus of rupture of Al 2 O 3 ‐spinel castables containing 20 wt% Al 2 O 3 ‐rich MgO‐Al 2 O 3 spinel and 1.36‐2.04 wt% CaO generally increases with an increase in both CaO content and temperature from 1300° to 1500°C, but it remains virtually constant from 1000° to 1300°C. Microscopic observation of the castable…
Many hopes and much controversy have surrounded the application of the maximum-entropy (ME) method to accurate charge-density studies. This paper shows that viewing such studies as an extension of Bayesian crystal structure determination provides practical means of fulfilling many of the hopes invested in the ME metho…
RATIONALE AND OBJECTIVES: The authors investigated the effect of multimerization on the relaxivity of macrocyclic gadolinium (Gd) chelates. The objective was to develop more sensitive magnetic resonance imaging (MRI) contrast agents to study biochemical processes. METHODS: Covalently linked nonionic, macrocyclic, mult…
An analysis of the correlation of theoretical predictions for Auger electron intensities is made with the experimental data of the high-resolution digital Auger database. This analysis covers single-element samples measured for 5 keV and 10 keV beam energies. The spectral data are for wide scans of 20–2500 eV at 1 eV…
A full-thickness wound model was used to evaluate the effects of a topically applied polyethyleneimine-based nitric oxide donor on wound repair in aged rats. Polymer applications were applied over a 10-day period on days 0, 2, 4, 6, and 8 comparing treatment (linear polyethyleneimine-nitric oxide) and control groups (…
In this work, the encapsulation of the transition metal complexes cis -Pt(NH 3 ) 2 Cl 2, Ru(bpy) 3 2+, and Ru(phen) 3 2+ within layers of hydroxyapatite on a porous Si/Si substrate are described. These specific complexes were selected as a consequence of their biological activity ( cis -Pt(NH 3 ) 2 Cl 2 ) or polynucle…
This paper reports measurements of yield stress of aqueous foams approaching the dry foam limit using a pendulum device. Traditionally, the vane rheometer has been used to measure the yield stress in liquids that exhibit wall slip. However, using the simple and inexpensive pendulum technique, shear rates many orders o…
The fabrication and sensor properties of polyaniline-platinum oxide chemoresistors in the presence of combustible gases such as hydrogen, methane, ethylene, acetylene and carbon monoxide is reported. Prior conditioning of the sensors in a hydrogen atmosphere resulted in increased selectivity and sensitivity for hydrog…
The collapse time of lithotripter shock wave-induced cavitation bubbles was found to be significantly reduced from in vitro (133–271 μs) to in vivo (34–99 μs), suggesting that bubble expansion in vivo could be severely constrained by the surrounding tissue. Calculations based on the Gilmore model for bubble dynamics s…
BACKGROUND AND AIM OF THE STUDY: Historically, the pyrolytic carbon used in mechanical prosthetic heart valves contained small amounts of silicon, this being a necessary additive to achieve consistently the hardness required for wear resistance. New processing technology has allowed the deposition of pyrolytic carbon…
Monolithic polymer‐derived Si‐C‐N ceramics were processed by blending an oligomeric Si‐C‐N precursor (liquid polysilazane) with 70 vol% of crosslinked or pyrolyzed Si‐C‐N powder particles, which were obtained from the same liquid precursor preheated at 300° or 1000°C, respectively. Powder compacts subsequently were an…
First-principles calculations are carried out to study the magnetic hardening of $({\mathrm{SmCo}}_{5})/({\mathrm{Co}}_{1\ensuremath{-}x}{\mathrm{Fe}}_{x})$ multilayers. The multilayer stacking along the c axis of the hexagonal hard phase $({\mathrm{SmCo}}_{5})$ and the (111) direction of the fcc soft phase $({\mathrm…
A flavodoxin from Azotobacter vinelandii is chosen as a model system to study the folding of alpha/beta doubly wound proteins. The guanidinium hydrochloride induced unfolding of apoflavodoxin is demonstrated to be reversible. Apoflavodoxin thus can fold in the absence of the FMN cofactor. The unfolding curves obtained…
Selected topics that may be of interest for both crystal-structure and crystal-growth communities are overviewed. The growth of protein crystals, along with that of some other compounds, is one of the topics, and recent insights into related phenomena are considered as examples of applications of general principles. T…
The structure of a silicate glass of composition ${\mathrm{K}}_{2}{\mathrm{O}\mathrm{\ensuremath{\cdot}}\mathrm{TiO}}_{2}{\mathrm{\ensuremath{\cdot}}2\mathrm{S}\mathrm{i}\mathrm{O}}_{2}$ has been reinvestigated by neutron diffraction with isotopic substitution of Ti. These data confirm Ti to be 5-coordinated within a…
Microfabrication technology, more commonly applied to the manufacture of integrated circuits, can be used to build devices useful for mechanical delivery of drugs and genes. Microprobes fabricated using silicon micromachining have been used to deliver DNA into cells as an alternative to bombardment and microinjection.…
All articles of this category bis(tetraethylammonium)bis(1,3-dithiole-2-thione-4,5-dithiol)zincate salt - DMIT - disodium 1,3-dithiole-2-thione-4,5-dithiolate - 1,4-dithiocines
Purified recombinant poly(hydroxyalkanoic acid), PHA, synthase from Chromatium vinosum was used to examine in vitro poly(3-hydroxybutyric acid) (P(3HB)) formation. In combination with purified propionyl-coenzyme A transferase of Clostridium propionicum a two-enzyme in vitro P(3HB) biosynthesis system was established w…
The undecamer of poly-L-leucine at the water-hexane interface is studied by molecular dynamics simulations. This represents a simple model relevant to folding and insertion of hydrophobic peptides into membranes. The peptide, initially placed in a random coil conformation on the aqueous side of the system, rapidly tra…