Materials Literature
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Molecular deformation of polypropylene (PP) was investigated by stress infrared experiments on ultraoriented isotactic PP samples, and the results were compared with single chain deformation calculations. A nonlinear stress-strain curve of PP was determined in a strain range of 8% which resulted in an average chain mo…
Alleles of the silk fibroin locus from 22 inbred stocks of Bombyx mori were compared. Nineteen alleles differing from one another in length and internal sequence organization were distinguished. Individuals from a single stock generaly are homozygous for a particular allele, as judged by their gene restriction pattern…
Abstract Vernadite (MnO 2 ·nH 2 O) is a mineral with a poorly ordered structure. Its synthetic analogue is designated δ -MnO 2 . Birnessite and vernadite are independent mineral species and cannot be described further under the same name. They have similar hexagonal unit-cell parameters, a 0 , but different c 0 parame…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTCrystal and molecular structure of the six-electron-reduced form of metatungstate Rb4H8[H2W12O40]..apprx.18H2O: occurrence of a metal-metal bonded subcluster in a heteropolyanion frameworkY. Jeannin, J. P. Launay, and M. A. Seid SedjadiCite this: Inorg. Chem. 1980, 19, 10, 2…
Low- and high-angle grain boundaries, and twin boundaries in aluminium and copper have been observed during in-situ electron irradiation using a high-voltage electron microscope. Evidence is presented for dislocation mechanisms of point-defect absorption in all three types of interface. In grain boundaries, climb of e…
Für Magnesiumhydrid, das möglicherweise als reversibler Wasserstoffspeicher verwendet werden kann, wurde eine Synthese entwickelt, die unter milden Bedingungen verläuft und auch im größeren Maßstab ausgeführt werden kann. Besonders aktive Katalysatoren erhält man durch Umsetzen von Anthracenmagnesium mit Chrom-, Titan…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTMetal clusters with exposed and low-coordinate nitride nitrogen atomsM. Tachikawa, Judith Stein, E. L. Muetterties, R. G. Teller, Mark A. Beno, E. Gebert, and Jack M. WilliamsCite this: J. Am. Chem. Soc. 1980, 102, 21, 6648–6649Publication Date (Print):October 8, 1980Publica…
The effect of prior cold work of 0 to 60% on subsequent sensitization of Type 304 stainless steel at 660 C was studied from anodic polarization scans in 1N HClO4 + 0.2N NaCl and 0.5M H2SO4 + 0.01 M KSCN solutions and from SCC behavior in room temperature 1N H2SO4 at 150mVSHE at a strain rate of 10−6 sec−1. Small amoun…
The DNA sequence orgainzation of the protein encoding region of the gene for silk fibroin has been analyzed. The accompanying paper (Manningm R. F., and Gage, L. P. (1980) J. Biol. Chem. 255, 9451-9457) shows that the total length of the gene, and its protein, as well as the pattern of restriction sites in the gene is…
Both the magnitude and the sense of the Burgers vector have been determined exactly from the number of the terminating thickness fringes at the exit of a dislocation from a wedge-shaped foil. Thickness fringes in foils of A1-Mg or Fe-Mn alloys were examined under weak-beam conditions in a 1 MV electron microscope for…
Least-squares refinements of the structure of low albite from Amelia, Virginia with three-dimensional neutron and X-ray diffraction intensity data sets yield weighted R factors of 0.024 and 0.035, respectively, with anisotropic thermal models. The two methods result in es-sentially identical positional parameters, tho…
Magnesium hydride, of potential use for reversible storage of hydrogen , has now been synthesized by a method proceeding under mild conditions and which can be performed on a large scale. Especially active catalysts are obtained by reaction of anthracenemagnesium with halides of chromium, titanium, or iron in THF. The…
A new allotrope of selenium has been found. X-ray analysis has revealed that the new form consists of hexameric molecules, Se 6 , with symmetry D 3d . It has been ascertained by rotational and Weissenberg methods that the crystal has a rhombohedral unit cell with lattice parameters in hexagonal axes, a =11.362±0.001 A…
Machine learning (ML) is transforming all areas of science. The complex and time-consuming calculations in molecular simulations are particularly suitable for an ML revolution and have already been profoundly affected by the application of existing ML ...Read More
Abstract 1,2,4,5‐Tetracyanobenzene reacts under mild conditions with anionic reagents not to polymer but to low molecular weight, high substituted phthalocyanines: 2,3,9,10,16,17,23,24‐octacyanophthalocyanine ( 3a ) and tetrakis(1‐imino‐3‐propoxyisoindolo)porphyrazine ( 3b ). 3a is saponified to the octacarboxyphthalo…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTAn efficient photocathode for semiconductor liquid junction cells: 9.4% solar conversion efficiency with p-InP/VCl3-VCl2-HCl/CA. Heller, B. Miller, H. J. Lewerenz, and K. J. BachmannCite this: J. Am. Chem. Soc. 1980, 102, 21, 6555–6556Publication Date (Print):October 8, 1980…
The addition of a small amount of molybdenum to amorphous Fe‐Cr‐B alloys improves the corrosion resistance in hydrochloric acid. In particular, amorphous alloys containing 5 atomic percent or more molybdenum passivate spontaneously even in , showing no pitting by anodic polarization. However, an excess addition of mol…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTCrystallization Kinetics from MSMPR CrystallizersJohn Garside and Mukund B. ShahCite this: Ind. Eng. Chem. Process Des. Dev. 1980, 19, 4, 509–514Publication Date (Print):October 1, 1980Publication History Published online1 May 2002Published inissue 1 October 1980https://pubs…
Abstract Samples containing allophane with molar Al/Si ratios from 1.0 to 2.0 have been examined by infrared spectroscopy, X-ray fluorescence, and phosphate adsorption methods. The infrared spectra of allophane with Al/Si ratios close to 2.0 showed that the wall of the allophane spherules is made up of imogolite struc…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTImidazolate complexes of iron and manganese tetraphenylporphyrinsJohn T. Landrum, K. Hatano, W. Robert Scheidt, and Christopher A. ReedCite this: J. Am. Chem. Soc. 1980, 102, 22, 6729–6735Publication Date (Print):October 15, 1980Publication History Published online1 May 2002…