Materials Literature
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Modern physicochemical biology steadily enriches our knowledge of the functional role of proteins and their elements-amino acids and peptides. These substances are involved in all essential molecular processes occurring in the living cell and perform key regulatory functions at the cellular and organismic levels. Thei…
Abstract Atomic standards of binding energies are presented for the calibration of X‐ray photoelectron spectrometers. The binding energies are measured using a VG Scientific ESCA 3 Mk II for which the photoelectron peak positions can be established with a measurement precision standard deviation of 5 meV. The absolute…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTAnalysis of stress-induced phase separations in polymer solutionsC. Rangel-Nafaile, A. B. Metzner, and K. F. WissbrunCite this: Macromolecules 1984, 17, 6, 1187–1195Publication Date (Print):June 1, 1984Publication History Published online1 May 2002Published inissue 1 June 19…
Oxygen-derived free radicals have been proposed as general mediators of tissue injury in a variety of disease states. Recent interest has focused on the possibility that free radicals may be involved in ischemic myocardial damage. However, the exact types of damage that result from myocardial exposure to free radicals…
A great deal of information exists on the retraction occurring in pastes, mortars and concrete, twenty-four hours after being mixed; we have very little information, however, concerning the volumetric changes which take place in a shorter period of time, this being mainly due to the difficulties which arise in measuri…
The energy crisis and subsequent retraction of sales on the market have demanded a greater exigency in the productive aspect of cement, requiring lower production costs and making the quality of the product more appropriate to the nature of its use in construction. This article focuses on the perspectives which should…
The petrography and physical properties of the building stones used in the construction of the Revillagigedo Palace (Gijón, Spain), 1699-1711, are studied. The physical properties more closely related to the state of alteration and to the alterability processes of these Uper Jurassic sandstones are quantified, namely:…
This study attempts to show the differences found between average resistance, after 28 days, obtained in the laboratory and that predicted when the C/A relationship has been calculated using the general De la Peña formula. This difference is considered to be sufficient to justify modifying the content of the formula,…
In this study, which follows on from others, the pH variation is examined and also that of the concentration of Ca (II) and SO4 (II) ions in the mediums (filtered potable water) in which the test samples of mortar (1: 3) made with industrial portland cement resistent to gypsum (cement 2 < > P-450-Y) and with the mixtu…
In the work we are presenting, we have set ourselves the target of determining a practical method for ascertaining the dosage of fibrous concrete. To do this, as in any problem regarding dosage, we shall start from the possibilities of supply, which will be conditioned by the nature of the aggregates to be used, of ce…
An algorithm to solve systems of linear homogeneous diophantine equations is given here. Subsequently, as an example of application, a method of heuristic search for the best solution is described; this fulfils certain conditions within an infinite space of solutions of various dimensions. Finally, an application of t…
V prĂĄci je struÄnÄ shrnut vĂ˝znam jednotlivĂ˝ch kovĹŻ, tj. Al, As, Cd a Pb z hlediska pivovarskĂŠho a zĂĄroveĹ je poukĂĄzĂĄno na pĹĂpadnĂŠ ĹĄkodlivĂŠ zdravotnĂ efekty. Koncentrace uvedenĂ˝ch 4 prvkĹŻ byly mÄĹeny v 31 vzorku 12%, 10% a 8% piva dostupnĂŠho na ÄeskoslovenskĂŠm trhu (celkem bylo p…
The levels of seven intermediary enzymes involved in acetate and butyrate formation from acetyl coenzyme A in the saccharolytic anaerobe Clostridium acetobutylicum were investigated as a function of time in solvent-producing batch fermentations. Phosphate acetyltransferase and acetate kinase, which are known to form a…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTOctahedral vs. trigonal-prismatic coordination and clustering in transition-metal dichalcogenidesMiklos Kertesz and Roald HoffmannCite this: J. Am. Chem. Soc. 1984, 106, 12, 3453–3460Publication Date (Print):June 1, 1984Publication History Published online1 May 2002Published…
Better understanding of the fundamental electrical properties of polymeric materials is a key to their further progress in the practical application, not only as electrical insulating materials, but also as functional elements. In this paper, recent topics and their important results will be reviewed on electrical con…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTDimagnesium iron(II) hydride, Mg2FeH6, containing octahedral FeH64- anionsJ. J. Didisheim, P. Zolliker, K. Yvon, P. Fischer, J. Schefer, M. Gubelmann, and A. F. WilliamsCite this: Inorg. Chem. 1984, 23, 13, 1953–1957Publication Date (Print):June 1, 1984Publication History Pu…
ADVERTISEMENT RETURN TO ISSUEPREVArticleFrom organic metals to superconductors: managing conduction electrons in organic solidsF. WudlCite this: Acc. Chem. Res. 1984, 17, 6, 227–232Publication Date (Print):June 1, 1984Publication History Published online1 May 2002Published inissue 1 June 1984https://pubs.acs.org/doi/1…
SUMMARY The stability of aggregates from 26 soils selected from agricultural areas was measured by wet‐sieving and the results correlated with sand, silt, clay, nitrogen, organic matter and iron contents and with cation exchange capacity. Highly significant correlations were obtained for the relationships between aggr…
A nonlinear calibration curve for volume fraction vs integrated intensity ratio was obtained for the monoclinic-tetragonal ZrO2 system by using X-ray powder pattern-fitting and pattern-decomposition techniques. The empirical equation agrees well with the theoretical one. By using this equation, the deviation from line…
The interactions between charged colloidal particles with sufficient strength to cause crystallization are shown to be describable in terms of the usual Debye–Huckel approximation, but with a renormalized charge. The effective charge in general is smaller than the actual charge. We calculate the relationship between t…