Materials Literature
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The electrical V-I characteristics of thin blown films of V2O5-Bi2O3 glasses with 95–70 mol % V2O5 were studied in the temperature range 200–400 K. It was observed that at lower fields, the bulk resistance controlled the current. At higher fields, all the glass compositions showed memory switching characteristics. The…
The interaction of cells with solid surfaces is important in many settings, including the response of tissue to implanted materials. Protein adsorption to the surface plays a critical role in controlling cell interactions with surfaces. However, few comprehensive studies of both cell behavior and protein adsorption in…
A convenient gas-liquid chromatography procedure to quantify poly-beta-hydroxybutyrate and poly-beta-hydroxyvalerate in activated sludge was developed by combining lyophilization of the samples, purification of the chloroform phase by water reextraction, and the use of capillary columns. With a flame ionization detect…
Transient behavior of small gas bubbles in a liquid set into violent motion by ultrasonic pressure waves is of interest because of widespread use of microsecond pulses in diagnostic ultrasound. Such pulses contain only a few pressure cycles and the transient pulsations of bubbles set in motion by such pulses would det…
ABSTRACT Muscle Type I collagen of five teleosts was characterized with respect to its thermal stability and subunit composition. The muscle collagen exhibited a higher denaturation temperature, Td, in solution and a higher degree of proline hydroxylation, compared with skin Type I collagen of the respective species.…
Abstract— The o‐, m‐, and p‐isomers of 5, 10, 15, 20‐ tetra(hydroxyphenyl)‐porphyrin have been of recent interest as potential second‐generation sensitisers in tumour phototherapy. Fluorescence spectroscopy, nanosecond laser flash photolysis and pulse radiolysis have been used to characterise the singlet and triplet e…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTXANES and EXAFS study of titanium alkoxidesF. Babonneau, S. Doeuff, A. Leaustic, C. Sanchez, C. Cartier, and M. VerdaguerCite this: Inorg. Chem. 1988, 27, 18, 3166–3172Publication Date (Print):September 1, 1988Publication History Published online1 May 2002Published inissue 1…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTNuclear magnetic resonance studies on unusual bacterial copolyesters of 3-hydroxybutyrate and 4-hydroxybutyrateYoshiharu Doi, Masao Kunioka, Yoshiyuki Nakamura, and Kazuo SogaCite this: Macromolecules 1988, 21, 9, 2722–2727Publication Date (Print):September 1, 1988Publicatio…
An exact representation of the transfer matrix for stratified homogeneous uniaxial media is derived. It can be used to calculate optical quantities such as reflectance and transmittance by means of Berreman’s 4 × 4 matrix method, permitting calculations for thick homogeneous slabs such as polarizers in one single step…
The properties of a recently synthesized photolabile chelator for divalent cations are described, the affinity of which for Ca2+ changes by some 5 orders of magnitude on illumination. The compound 1-(2-nitro-4,5-dimethoxyphenyl)-N,N,N',N'-tetrakis[(oxycarbonyl)me thyl]-1,2-ethanediamine (DM-nitrophen) binds Ca2+ (Kd a…
Inverse photoemission spectroscopy (IPES) is the new name for bremsstrahlung isochromat spectroscopy. It is used to study the unoccupied electronic states in solids and at their surfaces. The author surveys accomplishments in ultraviolet IPES particularly in its angle-resolved form. The author starts with an outline o…
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Some textural parameters to quantify the distribution of the Portland cement clínker phases are proposed. These parameters are evaluated under reflected-light microscopy and allow the characterization of Clinker homogeneity. Their application to an industrial cement clinker is presented.
The reader should first refer to the summary of the first part of this work (published in Materials de Construction, no. 209) in order to have a clearer idea of the subject being dealt with herein. In this part of the work, the experimental results of the ECO parametre (Evolution of Organoleptic Characteristics of the…
Mirror planes and rotation axes lead to rarity of space groups for organic structures. Their inhibiting effect is mitigated by the simultaneous presence of glide planes or screw axes or both. To a first approximation the number of structures in each space group of a given crystal class is given by Nsg = Acc exp (- Bcc…
This report describes several tests that are being carried out on a viaduct near Madrid City, whose reinforcements have been seriously damaged by corrosion. These tests consist in measuring corrosion potentials and in a time soon to come, they will include the measurement of corrosion rates by means of the apparent Po…
The fungal proteinase K (EC 3.4.21.14) is a very potent unusually stable member of the subtilisin family. Its X-ray structure determined at 0.15-nm resolution shows two bound Ca2+ ions. Ca1 is in near-ideal pentagonal bipyramidal configuration with Asp200 carboxylate and Pro175 peptide C = O in an apical, and Val177 p…
A linear term linked to molecular chirality occurs in the bending energy of membranes with ${C}_{2}$ or ${D}_{2}$ symmetry. We find it to alternate in sign, depending on the direction of a cylindrical curvature, and discuss consequences for anisotropic solid membranes, tilted fluid bilayers, and ferroelectric smectic…