Materials Literature
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ABSTRACT The sterol compositions of 14 species of marine diatoms were determined by gas chromatography and gas chromatography‐mass spectrometry. A variety of sterol profiles were found. The sterols 24‐methylcholesta‐5,22E‐dien‐3β‐ol, cholest‐5‐en‐3β‐ol, and 24‐methylcholesta‐5,24(28)‐dien‐3β‐ol, previously described a…
A task group of the JCPDS—International Center for Diffraction Data (ICDD) was established with the charge of investigating the use of silver behenate, CH 3 (CH 2 ) 20 COO·Ag, as a possible low-angle calibration standard for powder diffraction applications. Utilizing several data collection and analysis techniques, lo…
We have measured surface-enhanced resonance Raman scattering (SERRS) spectra of rhodamine 6G (R6G) at concentrations as low as 8 × 10 −16 M in colloidal silver solution activated by NaCl ions. The spectra were measured with a fiber-optic probe using the 514.5-nm argon-ion laser line as excitation source and a charge-c…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTElectrooxidation of CO and H2/CO Mixtures on a Well-Characterized Pt3Sn Electrode SurfaceHubert A. Gasteiger, Nenad M. Markovic, and Philip N. Ross Jr.Cite this: J. Phys. Chem. 1995, 99, 22, 8945–8949Publication Date (Print):June 1, 1995Publication History Published online1…
This work reviews the electroless copper deposition process as a metallization method for integrated circuit applications. We review the solution chemistry and reaction thermodynamics as well as the deposition kinetics for deposition on flat surfaces and on patterned surfaces with minimum dimensions between 0.1 and 1.…
The effect of hydrostatic pressure on the magnetic and electronic properties has been investigated for prototypical double-exchange ferromagnets, ${\mathrm{La}}_{1\mathrm{\ensuremath{-}}\mathit{x}}$${\mathrm{Sr}}_{\mathit{x}}$${\mathrm{MnO}}_{3}$, with varying nominal hole concentration x (0.15\ensuremath{\le}x\ensure…
Silicon nitride with a preferred orientation of large elongated grains was obtained by tape casting of raw powder slurry seeded with rodlike β‐Si 3 N 4 particles, followed by a gas pressure sintering under 1 MPa nitrogen pressure. The large elongated grains developed from seeds lay in planes parallel to the casting di…
The mechanisms underlying the postsynaptic localization of neurotransmitter receptors are poorly understood. Recently, the peripheral membrane protein gephyrin has been shown to be essential for the formation of inhibitory glycine receptor clusters in cultured rat spinal cord neurons. In vitro gephyrin binds with high…
We have utilized a T7 polymerase/promoter system for the high-level incorporation of methionine analogs with suitable labels for structural research (X-ray and NMR studies) on recombinant annexin V produced in Escherichia coli. Here, we describe, to our knowledge, the first biosynthetic high-level substitution of meth…
Hypocrellins and hypericins, structurally related plant pigments isolated from Hypocrella bambuase and Hypericum respectively, are known photodynamic agents. This review summarizes certain significant advances in the photophysics, photochemistry and photobiology of these pigments in the last 2 years and discusses thei…
The first attempt to combine luminescence spectroscopy with scanning soft x-ray microscopy has been realized in our experiment. A new imaging luminescence spectrometer with a Schwarzschild objective was designed and built with a spectral resolution of 1.3 nm in the energy range of 1.6–6.5 eV for this purpose. Some lum…
The analytical study described on this paper has been made due to the request formulated by the priest of Santiago church, D. José Mª Ballesteros, through the Provincial Delegation of Culture of Granada. In view of the degradation of the main door front, the Instituto Andaluz del Patrimonio Histórico has been asked fo…
The behaviour under different accelerated aging tests (freeze/thaw and crystallization cycles) of a new lime mortar with biocide properties destinated to monumental repair has been studied. New mortars (which have the biocide impregnated in a clay called sepiolite) have a similar behaviour to lime mortars used as a re…
The scarce references which exist in the bibliography on this subject and their vagueness on the factors which have an influence on the reduction of the strength of aluminous cement concrete due to the effect of alkalinity, have not yet allowed the limits to be clearly seen which could give rise to a situation of risk…