Materials Literature
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It seems certain now that cholesteric liquid crystals (cholesterics, or CLC, for short) have been the first examples of mesomorphic state of matter known to humankind. Apart from the well-known discovery of the two-stage melting of cholesteryl benzoate made by Reinitzer in 18881 and cited in almost all the textbooks,…
Close-contact melting was investigated by performing a series of experiments in which blocks of solid n-octadecane (with circular or rectangular cross section) were melted by a horizontal planar heat source at constant surface temperature. Close contact between the source and the solid prevailed throughout the experim…
The cubic-crystalline field-splitting parameter a of ${\mathrm{Fe}}^{3+}$ at a Ti site in ${\mathrm{BaTiO}}_{3}$ has been measured with EPR in the cubic phase as a function of pressure p and temperature T. From these measurements, the relative explicit volume and temperature dependences of a(p,T) have been obtained. T…
Abstract Differential Scanning Calorimetry (DSC) is used to study the curing behavior of epoxy systems. For non‐catalyzed diamine‐epoxy systems, the reaction enthalpy ΔH and the glass transition temperature T g are evaluated and related to the structure of the hardener. A method is developed to determine the activatio…
A large number of species originally assigned to Synedra have been investigated mainly by scanning electron microscopy. Most are marine or brackish in distribution and structurally they differ considerably from Synedra as defined from the freshwater species and hence we have been able to recognise five new generic tax…
By using x-ray diffractometry and 13C-NMR spectroscopy, in combination with chemical and heat pretreatments, we have found good evidence for the occurrence of interlayer clay-organic complexes in two New Zealand soils. Here, the clay mineral is a regularly interstratified mica-smectite, and the organic species is a hu…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTOn the structure of the quenched mesomorphic phase of isotactic polypropyleneP. Corradini, V. Petraccone, C. De Rosa, and G. GuerraCite this: Macromolecules 1986, 19, 11, 2699–2703Publication Date (Print):November 1, 1986Publication History Published online1 May 2002Publishe…
A model of combined heat and water vapor transport in multi-layered clothing is presented. Transport of heat by conduction and radiation and vapor transport by diffusion are included; heat and mass transport by forced convection are not. The calculations are performed in a time-dependent mode and compared to experimen…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTHigh-spin .fwdarw. low-spin relaxation kinetics and cooperative effects in the hexakis(1-propyltetrazole)iron bis(tetrafluoroborate) and [Zn1-xFex(ptz)6](BF4)2(ptz = 1-propyltetrazole) spin-crossover systemsAndreas Hauser, Philipp Guetlich, and Hartmut SpieringCite this: Ino…
The geometries of two disulfide bridges genetically engineered into subtilisin have been characterized by x-ray crystallography to determine the structural and energetic constraints involved in introducing disulfide bonds into proteins. Both disulfide bridges (Cys-24-Cys-87 and Cys-22-Cys-87) exhibit atypical sets of…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTDistance dependence of SERS enhancement factor from Langmuir-Blodgett monolayers on metal island films: evidence for the electromagnetic mechanismG. J. Kovacs, R. O. Loutfy, P. S. Vincett, Carol Jennings, and Ricardo ArocaCite this: Langmuir 1986, 2, 6, 689–694Publication Da…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTNuclear magnetic resonance studies on poly(β-hydroxybutyrate) and a copolyester of β-hydroxybutyrate and β-hydroxyvalerate isolated from Alcaligenes eutrophus H16Yoshiharu Doi, Masao Kunioka, Yoshiyuki Nakamura, and Kazuo SogaCite this: Macromolecules 1986, 19, 11, 2860–2864…
The phase relationships in the system ZrO 2 ‐TiO 2 near the compound ZrTiO 4 have been clarified through an experimental study involving the characterization of both single‐crystal and powder specimens, the latter prepared through conventional solid‐state reaction and also by low‐temperature co‐precipitation methods.…
Starvation proteins synthesized by Escherichia coli at the onset of carbon starvation (R. G. Groat and A. Matin, J. Indust. Microbiol. 1:69-73, 1986) exhibited four temporal classes of synthesis in response to glucose or succinate starvation, indicating sequential expression of carbon starvation response (cst) genes.…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTPhotophysics of quantized colloidal semiconductors. Dramatic luminescence enhancement by binding of simple aminesT. Dannhauser, M. O'Neil, K. Johansson, D. Whitten, and G. McLendonCite this: J. Phys. Chem. 1986, 90, 23, 6074–6076Publication Date (Print):November 1, 1986Publi…
The vacuum ultraviolet absorption cross sections of SiH4, GeH4, Si2H6, and Si3H8 are reported for the wavelength region 107–220 nm using synchrotron radiation as a light source. Absorption maxima of these compounds were found at the exciting wavelengths of 115–119 nm. Broad peaks observed were mostly assigned as prima…
Recursion formulae for calculating the reflected amplitude ratio of multilayers and superlattices have been derived from the Takagi-Taupin differential equations, which describe the dynamical diffraction of X-rays in deformed crystals. Calculated rocking curves of complicated layered structures, such as non-ideal supe…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTIsodimorphism in bacterial poly(β-hydroxybutyrate-co-β-hydroxyvalerate)Terry L. Bluhm, Gordon K. Hamer, Robert H. Marchessault, Colin A. Fyfe, and Richard P. VereginCite this: Macromolecules 1986, 19, 11, 2871–2876Publication Date (Print):November 1, 1986Publication History…
Fe-Cr-Co magnets are well-known for their ductility and superior magnetic properties comparable to Alnico alloys. Results on the trials to manufacture them by casting are disclosed. It is found that by proper melting, suitable composition adjustment, and continuous cooling in magnetic aging, magnetic properties compar…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTPlant Growth Regulatory Indoles from the Sponges Dysidea etheria and Ulosa ruetzleriJohn H. Cardellina II., David Nigh, and Bradford C. VanWagenenCite this: J. Nat. Prod. 1986, 49, 6, 1065–1067Publication Date (Print):November 1, 1986Publication History Published online1 Jul…