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Une analyse générale de la topologie des dislocations dans les corps mésomorphes conduit à distinguer des "disinclinaisons" parfaites dont la rotation est parallèle ou perpendiculaire à l'axe hélicoïdal d'un cholestérique. L'appariement de deux disinclinaisons du second type, de signes opposés, donne un mode de dissoc…
Infrared spectra of pyridine-H5 and pyridine-D5 in the solid state were measured between 4000 and 200 cm− 1. Frequencies and polarization of fundamental absorptions were established for oriented thin films of freshly crystallized samples. Behavior of the bands in polarized light aided in clarifying several assignments…
Get PDF Email Share Share with Facebook Tweet This Post on reddit Share with LinkedIn Add to CiteULike Add to Mendeley Add to BibSonomy Get Citation Copy Citation Text P. F. Mullney and P. N. Dean, "Cell Sizing: a Small-Angle Light-Scattering Method for Sizing Particles of Low Relative Refractive Index," Appl. Opt. 8,…
Abstract The changes occurring when polythene melts are subjected to shear, have been investigated using a rotating bob fitted into a ram extruder. In addition to chain scission, low density polythene exhibits reversible changes in mechanical and viscoelastic properties. The magnitude of the changes is controlled by t…
The enzymic activity of acetylcholinesterase can be photoregulated through the mediation of photochromic inhibitors of the enzyme. N-p-phenylazophenyl-N-phenylcarbamyl fluoride, an irreversible inhibitor of acetylcholinesterase, exists as two geometric isomers which are interconvertible through the action of light. Th…
Abstract A useful concept in polymer science is the degree of crystallinity—the fraction of the polymer that exists in a relatively ordered state. Methods of determination of the degree of crystallinity using density, infrared, thermal, N.M.R. and X ‐ray measurements are examined in light of modern notions of the stru…
The formula proposed recently by Vuks for the polarization field associated with strongly anisotropic organic molecules has been applied to evaluate the orientational order in p-azoxyanisole, p-azoxyphenetole and their mixtures in the nematic phase. It is found to yield accurate results as is confirmed by the internal…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTCoordination of palladium by azo and related functional groupsAlan L. Balch and D. PetridisCite this: Inorg. Chem. 1969, 8, 11, 2247–2252Publication Date (Print):November 1, 1969Publication History Published online1 May 2002Published inissue 1 November 1969https://pubs.acs.o…
Abstract Some properties of multilayered films are summarized in relation to the properties of the component materials. Polymers may be selected for co‐extrusion into layered films to obtain various combinations of properties, such as barrier, stiffness, heat sealability, optics, and toughness. Properly chosen combina…
Abstract β-Hydroxydecanoyl thioester dehydrase from E. coli has been shown to have a molecular weight of 36,000 by ultracentrifugation, gel filtration, and amino acid composition. Electrophoretic behavior, however, suggests that the protein molecule is composed of two equal, if not identical, polypeptide chains of mol…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTInfrared spectra and bonding in the sodium superoxide and sodium peroxide moleculesLester AndrewsCite this: J. Phys. Chem. 1969, 73, 11, 3922–3928Publication Date (Print):November 1, 1969Publication History Published online1 May 2002Published inissue 1 November 1969https://p…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTKinetics of crystal growth of dicalcium phosphate dihydrateRobert W. Marshall and George H. NancollasCite this: J. Phys. Chem. 1969, 73, 11, 3838–3844Publication Date (Print):November 1, 1969Publication History Published online1 May 2002Published inissue 1 November 1969https…
According to Doyle, the thermogravimetric curve of a decomposition reaction can be expressed by the equation log g(α)–log p(x) = B. The variable x depends on the temperature Tα, at which the fraction of the initial compound decomposed is α. Both g(α) and p(x) depend on temperature; however, B is independent of tempera…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTThe Kinetic Equation for the Initiated, Anionic Polymerization of η-CaprolactamR. Z. Greenley, J. C. Stauffer, and J. E. KurzCite this: Macromolecules 1969, 2, 6, 561–567Publication Date (Print):November 1, 1969Publication History Published online1 May 2002Published inissue…
Circular cylindrical shells with axisymmetric imperfections tested under axial compressive load, studying imperfection amplitude and wavelength effects on minimum buckling load
Abstract The physical optics of iridescent multilayered plastic films are analyzed theoretically relating the layer thickness, layer arrangement, and refractive index difference between layers to the reflection spectra for light at normal incidence. Very vivid iridescent and metallic‐appearing films may be made by pro…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTEscherichia coli citrate synthase. Purification and the effect of potassium on some propertiesGerald R. Faloona and Paul A. SrereCite this: Biochemistry 1969, 8, 11, 4497–4503Publication Date (Print):November 1, 1969Publication History Published online1 May 2002Published ini…
Electrochemical studies were made in aqueous LiCl, MgCl2, and MgBr2 solutions and in ZnCl2/KCl molten salt to clarify the corrosion reactions related to stress corrosion cracking (SCC) of austenitic stainless steel and to better define environmental variables critical to the occurrence of chloride SCC. Type 304 stainl…
The mechanical properties of chemically vapor‐deposited β‐Sic were measured in bending between room temperature and 1400°C. Material with grain diameters from less than 1 to 15 μm was tested. No grain‐size dependence of the bend strength of dense (<99% of theoretical) Sic was observed at any test temperature. The f…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTMicelle formation in pure ethylene glycolAshoka RayCite this: J. Am. Chem. Soc. 1969, 91, 23, 6511–6512Publication Date (Print):November 1, 1969Publication History Published online1 May 2002Published inissue 1 November 1969https://pubs.acs.org/doi/10.1021/ja01051a069https://…