Materials Literature
按标题、摘要、年份、主题和来源检索公开元数据。结果保留作者、摘要、分类与原始来源链接。
Active transport across the vacuolar components of the eukaryotic endomembrane system is energized by a specific vacuolar H+-ATPase. The amino acid sequences of the 70- and 60-kDa subunits of the vacuolar H+-ATPase are approximately equal to 25% identical to the beta and alpha subunits, respectively, of the eubacteria…
A review is given of the experimental investigations of the magnetocaloric effect (MCE) in rare-earth magnetic materials of different classes: heavy rare-earth metals and their alloys, iron garnets, and intermetallic compounds. The results of measurements of the MCE near phase transitions are given for the vicinity of…
The gene coding for nitrite reductase of Pseudomonas aeruginosa has been cloned and its sequence determined. The coding region is 1707 bp long and contains information for a polypeptide chain of 568 amino acids. The sequence of the mature protein has been confirmed independently by extensive amino acid sequencing. The…
Crystals of hen egg white lysozyme soaked in 15% (v/v) dimethyl sulfoxide have been studied with single-crystal neutron diffraction to determine the effect of the solvent molecules on the protein configuration. A total of 9423 statistically significant Bragg reflections to a resolution of approximately 1.8 A were used…
The dynamics of ultra-thin wetting films has been studied experimentally under a controlled atmosphere using a dynamic ellipsometric technique. The spreading fluid was PDMS and the substrates were oxide covered silicon wafers. The situations of capillary rise up a vertical wall, and the spreading of 'nanoscopic' drops…
We report on measurements of the thermal conductivity ${\mathrm{\ensuremath{\kappa}}}_{\mathrm{T}}$ close to the Peierls transition temperature ${\mathrm{T}}_{\mathrm{P}}$ in ${\mathrm{K}}_{0.3}$${\mathrm{MoO}}_{3}$ and (${\mathrm{TaSe}}_{4}$${)}_{2}$I. In both cases there is an enhancement of ${\mathrm{\ensuremath{\k…
We report identical double fluorescence lifetimes of τ = 3·7 and 6·3 ns for the 0-0 fluorescences of each of the two tautomeric species of metal-free phthalocyanine (H2Pc) in a mixed solvent matrix of α-chloronaphthalene and n-octane at 4·2K. Such double lifetime feature has not been reported previously for this molec…
Abstract A series of novel photosensitive urethane oligomers was synthesized in which methacryloyl group was contained in the hard segment. The hard segment was prepared by reacting 4,4′‐diphenylmethane diisocyanate with glycerine mono methacrylate, which was successively reacted with three kinds of glycols involving…
Photoluminescence (PL) bands at 4.1 eV with decay time τ < 20 ns and at 3.0 eV with τ = 78 μs are excited in the oxygen defieiency-related optical absorption band at 5.06 eV. These PL bands are closely similar to the PL bands in Ge-doped glassy SiO2. They are attributed to the transitions from 1B1 and 3B1 excited stat…
Optical experiments on free-standing liquid crystal films which address the issues of structural ordering, fluctuations in two dimensions and enhanced surface ordering will be reviewed. Also, results on a novel electrohydrodynamic mode will be presented.
By appropriate variation of starting composition we demonstrate that melt-spun materials comprised primarily of Nd2(CoxFe1−x)14B and having optimum energy products can be prepared. Twelve cobalt concentrations spanning the entire cobalt substitution range have been investigated. We report ambient as well as elevated t…
We report picosecond photoinduced bleaching (PB) of the exciton absorption of the emeraldine base form of polyaniline. The temperature- (T-) independent dispersive decay, \ensuremath{\sim}${t}^{\mathrm{\ensuremath{-}}0.11}$, observed in this study differs markedly from the dynamics of earlier studied semiconductors. I…
A Fabry–Perot interferometer system was used to measure the free-surface velocity of α-alumina powder compact. In situ pressure profile measurements using a pair of manganin gauges were also carried out to clarify the compaction process during compression and stress release. The Fabry–Perot system indicates that the r…
Diffusion coefficients of hydrogen have been measured in disordered ${\mathrm{Ti}}_{1\mathrm{\ensuremath{-}}\mathrm{y}}$${\mathrm{V}}_{\mathrm{y}}$ alloys, as a function of temperature, hydrogen concentration, and alloy composition. Diffusion and electron microprobe analysis data indicate the existence of short-range…
Precise results of first-principles electronic-structure calculations of the structural and electronic properties of the binary compound LiAl are presented for the bcc-based B32 and B2 crystal structures, the fcc-based L${1}_{0}$ and the simple-cubic-based B1 structures as obtained with the full-potential linearized a…
Measurements of the swelling pressure ω̄ and shear modulus Gs in a set of poly(vinyl acetate) networks swollen to different degrees in toluene and in acetone are reported, using solutions of the uncross-linked polymer to obtain deswelling under known conditions of osmotic pressure. The swelling pressure can be complet…
High-resolution resistivity and magnetoresistance measurements have been performed as a function of temperature on pregraphitic carbon fibers. The resistivity exhibits a negative temperature coefficient (d\ensuremath{\rho}/dT<0) from room temperature down to 1.5 K. It is shown that such behavior can hardly be expla…
Three-dimensional computer simulation is carried out for the aggregation process of colloids using the sticky sphere model proposed in the previous paper. Time evolution of the structure of aggregates and macroscopic viscosity is studied when a shear flow is started in a suspension of the sticky spheres. In the transi…
During directional solidification of thin layers (50 μm) of the transparent CBr 4 -C 2 Cl 6 lamellar eutectic alloy, we observed tilt waves, a type of instability consisting in small domains of tilted lamellae moving transversely along the growth front. This instability is a way the system adjusts its wavelength after…
Plasmon broadening in small metal clusters is calculated using the jellium model. We find that thermal fluctuations in the shape of the cluster could be a significant source of broadening of the Mie resonance. The shape fluctuation mechanism makes definite predictions for the shape of the resonance line, its temperatu…