Materials Literature
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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…
Pyrolysis of organometallic precursors such as metallocenes and iron pentacarbonyl as well as of their mixtures with hydrocarbons such as acetylene or benzene has been carried out under a variety of conditions to synthesize nanotubes. While the use of benzene as a hydrocarbon source generally yields multi-walled nanot…
In thin films of smectic C liquid crystals, localized regions containing additional smectic layers form circular inclusions that carry a topological charge. Such inclusions nucleate a companion topological defect. These inclusion-defect pairs are modelled as topological dipoles within the context of a one-coupling con…
Pluronic surfactants, PEO-PPO-PEO triblock copolymers, have been investigated widely due to their protein-resistant properties in applications as coatings for implants and in controlled drug release systems. We have studied a wide range of these copolymers, varying in both PEO and PPO block size, by adsorbing them to…
Experimental evidence of a cation-pi interaction between a sodium cation (Na+) and the indole ring of residue Trp123 in a structure (2.0 A) of hen egg-white lysozyme is presented. The geometry of the metal ion-pi interaction observed in the protein structure (distance between the aromatic plane and the cation approxim…
The resistivity of films of the metallic magnet ${\mathrm{CrO}}_{2}$ deposited onto ${\mathrm{ZrO}}_{2}$ substrates has been measured in the temperature range $T=1.6$ to 410 K. Longitudinal and transverse magnetoresistances have also been measured between 0.55 and 380 K in magnetic fields up to 10 T. The resistivity h…
We sought to examine whether surface modification of expanded polytetrafluoroethylene (ePTFE) vascular grafts might extend graft patency without modifying the graft structure. Amide and amine plasma (butylamine) were applied to graft surfaces using radio frequency glow discharge. Surface analyses by Fourier transform…