Materials Literature
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Abstract EPR and matrix ENDOR spectra have been examined for polyenyl radicals in γ‐irradiated PVF, PVF 2 , PVC, and PMMA polymers. Proton matrix ENDOR is observed for all four polymers, and fluorine matrix ENDOR for PVF and PVF 2 . By line shape analysis of the ENDOR spectra obtained under comparable conditions, delo…
Abstract ABS (acrylonitrile‐butadiene‐styrene) plastics are one of the most common two‐phase commercial polymer systems. They consist of a continuous rigid phase (styrene‐acrylonitrile co‐polymer) in which the elastomer phase (polybutadiene grafted with styrene and acrylonitrile) is finely dispersed in the form of sph…
The electrical resistivity of silver foils 15−25 μm thick was measured during shock−wave compression between sapphire anvils in the pressure range 25−120 kbar. Comparison of isothermal resistivity vs compression from shock measurement to a simple semiempirical calculation of resistivity under hydrostatic compression s…
Ductility is a property of a material which has been defined by many investigators who have employed a variety of measurements or indices. The purposes of this paper are to describe some of these indices with emphasis on those employed at elevated temperature and to discuss some of the correlations with particular mat…
Designers of critical devices and machines are frequently confronted with the need to compromise between available materials which will resist, simultaneously, mechanical wear by elements in contact and corrosion by a process environment. These two qualities have long been mutually exclusive from the materials selecti…
Thirty-six steers, divided equally between Angus and Charolais breed types, were slaughtered after 153 (Group I) and 233 (Group II) days on a standard finishing ration. A 3.81 cm steak from the longissimus from the seventh thoracic rib region was removed from the left wholesale rib 48 hr postmortem and used for histol…
Abstract The Raman spectra of (NH 4 ) 2 SO 4 single crystals have been recorded and measured using an Ar + laser as a scource of excitation. The polarization behaviour of the Raman lines in different crystal orientations has been studied. The observed shifts in the range 15–3400 cm −1 have been attributed to the phono…
Properties of carbon-felt, pyrolytic carbon-matrix composites have been measured as a function of fiber precursor [rayon and polyacrylonitrile (PAN)] and matrix microstructure (smooth laminar, rough laminar, and isotropic). The primary matrix effect is caused by the graphitic nature of the heat-treated rough laminar m…
We have measured the fluorescent decay rates of the $^{3}P$ states of the ${\mathrm{Pr}}^{3+}$ ion in trihalide crystals as a function of temperature. When extrapolated to 0 K we find that the fluorescent lifetimes of $^{3}P_{0}$ are 14.7 \ifmmode\pm\else\textpm\fi{} 1.0 \ensuremath{\mu}sec (${\mathrm{Pr}}_{0.01}$${\m…
Abstract The photochromism of 1-(β-carboxyethyl)-3,3-dimethyl-6′-nitrospiro[indoline-2,2′-2H-benzopyran] (I) was studied in water-dioxane. It was found that (I) exhibits normal photochromism in dioxane and reverse photochromism on addition of water to the solution.
Steel balls were dropped on to massive glass prisms at an impact angle of 45° in order to determine the effects of oblique impact on several attributes of flake size and flake shape. The results indicate that a flake produced by oblique impact is shorter, but not significantly thinner (except in the immediate area of…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTProton nuclear magnetic resonance study of the site of metal binding in tetracyclineDale E. Williamson and Grover W. Everett Jr.Cite this: J. Am. Chem. Soc. 1975, 97, 9, 2397–2405Publication Date (Print):April 1, 1975Publication History Published online1 May 2002Published in…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTRadiationless decay of singlet molecular oxygen in solution. II. Temperature dependence and solvent effectsCharles A. Long and David R. KearnsCite this: J. Am. Chem. Soc. 1975, 97, 8, 2018–2020Publication Date (Print):April 1, 1975Publication History Published online1 May 20…
The pyruvate kinases of Escherichia coli activated by ribose 5-phosphate (RP) has been partially purified. The active form of the enzyme has a molecular weight of about 180 000 as judged by sucrose density gradient centrifugations and Sephadex G-150 chromatography. On dissociation in the absence of sulfhydryl reagents…
The tensile strength of seventeen engineering materials including steels, Al alloys, and fiber-reinforced plastics, has been determined at strain-rates from 10−3 to 103 sec−1. Variable effects on the stress-strain behavior were found in the different materials with the Al alloys showing minimal strain-rate sensitivity…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTDistortions of the coordination polyhedron in high-spin manganese(III) complexes. I. Synthesis and characterization of a series of five- and six-coordinate bis(acetylacetonato)manganese(III) complexes. Crystal structure of azidobis(acetylacetonato)manganese(III)B. Ray. Stult…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTPorous, polymer-bonded metalloporphyrinsLouis D. RollmannCite this: J. Am. Chem. Soc. 1975, 97, 8, 2132–2136Publication Date (Print):April 1, 1975Publication History Published online1 May 2002Published inissue 1 April 1975https://pubs.acs.org/doi/10.1021/ja00841a023https://d…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTElectronic effects in transition metal porphyrins. I. Reaction of piperidine with a series of para- and meta-substituted nickel(II) and vanadium(IV) tetraphenylporphyrinsF. Ann Walker, Edmond Hui, and Janet M. WalkerCite this: J. Am. Chem. Soc. 1975, 97, 9, 2390–2397Publicat…
Procedures are described for the assay of collagen galactosyltransferase and collagen glucosyltransferase activities. The methods are based on the transfer of [ 14 C]galactose or [ 14 C]glucose from the corresponding radioactive UDP‐glycoside to hydroxylysyl or galactosylhydroxylysyl residues in calf‐skin gelatin subs…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTNew approach to the preparation of tetrathiafulvalenium saltsF. WudlCite this: J. Am. Chem. Soc. 1975, 97, 7, 1962–1963Publication Date (Print):April 1, 1975Publication History Published online1 May 2002Published inissue 1 April 1975https://pubs.acs.org/doi/10.1021/ja00840a0…