Materials Literature
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The effects of pressure on thermal denaturation and in vitro fibril formation of acid soluble collagen from calf skin were studied with various solvent conditions under high pressure of up to 4, 000 atm. For all the solvent systems, the thermal denaturation was depressed by pressure, e.g., the apparent denaturation te…
Neutral soluble collagen was extracted from lathyritic rat skin under proteolysis-inhibited conditions. Purified solutions were characterized by electric birefringence and heterodyne beat quasi-elastic light-scattering techniques under conditions where the monomeric form was stable (at 4 degrees C in 0.032 M phosphate…
The symposium on Flammability and Sensitivity of Materials in Oxygen was held in Phoenix, Arizona, 31 March-1 April 1982, and was sponsored by ASTM Committee G04 on Compatibility and Sensitivity of Materials in Oxygen-Enriched Atmospheres. Barry L. Werley
MgO compacts were sintered from 900° to 1395°C in dry argon and in argon with 2.3 kPa of water vapor. The surface area and pore size distributions measured by mercury porosimetry showed large changes during the first minute of sintering, indicating that rearrangement instead of coalescence of small particles is the co…
The diamagnetic susceptibilities of some 4,4'-disubstituted biphenyl cyclohexanes are reported as a function of temperature. The order parameters of the uniaxial nematic, smectic A and smectic B phases are calculated. The effect of the terminal substituents and the central groups on the magnetic anisotropy and the ord…
29 Si N.m.r. spin–lattice relaxation times have been measured in some layer aluminosilicates and found to vary over three orders of magnitude, demonstrating that, in contrast to results reported to date, 29Si T1's may be extremely long in aluminosilicates.
Eclogites from the Eastern Belt of the Seve Nappes, Jämtland, Central Scandinavian Caledonides, have an LS fabric in which the foliation S and lineation L are both defined by the shape preferred orientation of omphacite. The orientation distribution diagram of omphacite reveals a crystallographic fabric defined by [00…
The asymmetric halogenation and hydrohalogenation of olefins have been achieved in the microcrystals of cyclodextrin complexes which act as chiral matrices.
A generalized Stefan problem which includes surface tension is presented as a mathematical model for the growth and melting of a solid. It is shown that planar melting is linearly morphologically stable with or without surface tension, while planar solidification is unstable without surface tension and is stabilized w…
It has long been recognised that analysis of polarisation curves can provide valuable insight into the mechanisms of electrochemical processes provided that the analysis is founded on theoretically based equations such that the coefficients have physical meaning. This approach has however been confined to relatively s…
Surface preparation and corrosion behavior of titanium alloys were studied; both topics deal with the formation of surface oxide films. When metals are prepared for surgical implant use, an effort is made to produce an optimum surface. Effects of the surface treatments on surface morphology, surface film composition,…
A microporous, compliant and biodegradable vascular prosthesis prepared from a polyurethane-poly-L-lactic-acid (PU-PLLA) mixture, induces fast growth of a neo-artery after implantation as an arterial substitute. The prostheses used in this study resulted in 100% patency. Mechanical functionality of the neo-arteries is…
The present knowledge of the influence of helium on the high temperature mechanical properties of metals to be used as structural materials in fast fission and in future fusion reactors is reviewed. A wealth of experimental data has been obtained by many different experimental techniques, on many different alloys, and…
Steep-fronted switching surges can cause undesirable transient voltage distributions in stator windings, resulting in severely stressed interturn insulation. The effects of coil and surge parameters on transient voltage distribution are not well understood. The paper reports the results of an investigation into the ef…
Abstract Spectroscopic properties of YAG and YAP doped with Fe were compared. YAG :Fe crystals grown under reducing atmosphere showed strong colouration whereas similar colouration in YAP :Fe was found after oxygen treatment. Nd 3+ luminescence was effectively quenched by Fe ions in YAP, whereas Ce 3+ luminescence was…
Fe1−xTix alloy films obtained by rf sputtering technique have been investigated by X-ray diffraction and magnetization measurements. The single bcc phase is extended up to about x=0.18, while the amorphous phase is realized for x>0.2, where the intermetallic compound, TiFe2 and the ordered phase, TiFe, are stabilized…
Many silicate and borate glass systems exhibit sub-liquidus immiscibility. The fine-scale microstructure of phase separated systems has been studied mainly by electron microscopy and small angle X-ray scattering. The classical theories of homogeneous nucleation, spinodal decomposition and coarsening, and more recent s…
A well-characterized three-chain peptide [(Col1)2 X T9] from human type III collagen was a rich source of Ehrlich chromogen. The corresponding two-chain peptide [(Col1)2] was not, implying that the Ehrlich chromogen is a trifunctional cross-link. (Col1)2 X T9 also contained pyridinoline, which is not an Ehrlich chromo…
Copepod feeding on the colony-building diatom Thalassiosira partheneia was studied in spring 1975 in the Northwest African upwelling area. Healthy, whole colonies of T. partheneia (diameter -1 cm) were offered as food as well as single cells (diameter -9 pm) after disintegration of the colonies. In addition, comparati…
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