Materials Literature
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Transmission formulas and transmission curves of birefringent filters when the optic axis is not in the plane of the filter plates are given and discussed in detail. The optimum parameters of birefringent filters, such as the most suitable ratio of thicknesses, tuning angles, and plate thicknesses, are obtained. As fa…
Abstract Equilbrium isotherms are reported for adsorption of water vapour on several different activated alumina adsorbents. The experimentally measured isotherms represent the sum of the contributions from water vapour held in several ways but these contributions can be resolved by detailed analysis. The individual i…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTOrigin of excess light scattering in poly(methyl methacrylate) glassesYasuhiro Koike, Shiro Matsuoka, and Harvey E. BairCite this: Macromolecules 1992, 25, 18, 4807–4815Publication Date (Print):August 1, 1992Publication History Published online1 May 2002Published inissue 1 A…
ABSTRACT The species of the genus Chlorella exhibit considerable biochemical and physiological differences. Therefore, it is important to select for and utilize in research or biotechnology correctly identified strains of the species having the most favorable properties for the respective project. We examined the Chlo…
Conformations and electronic structures of polymers based on polythiophene with various fused fragments were theoretically investigated. Thioethylenic, thiodimethylenic, and ethylenic fragments were explored, yielding polythieno(3,4-b)thiophene, polythieno(3,4-c)thiophene, and poly(3- thiabicyclo(3.2.0)-1,4,6-heptatri…
Bacillus megaterium is known to have several genes that code for isozymes of glucose dehydrogenase. Two of them, gdhI and gdhII, were cloned from B. megaterium IAM1030 in our previous work (T. Mitamura, R. V. Evora, T. Nakai, Y. Makino, S. Negoro, I. Urabe, and H. Okada, J. Ferment. Bioeng. 70:363-369, 1990). In the p…
The same integrated intensity is observed for the interface-PC signal in PC(13C)/PS(12C/*) and PC(13C)/PS(2D/*) thin film blends in a DNP-difference experiment. This result proves that the dominant mechanism of polarization transfer from the electrons in the PS phase to the protons in the PC phase is by direct polariz…
The electronic and ionic conductivities of poly‐(3‐methylpyrrole‐4‐carboxylic acid) have been measured in situ by twin electrode voltammetry and impedance spectroscopy, respectively. The electronic conductivity of this polymer, ca. 10 −2 (Ω cm) −1 , is about 1000 times higher than its ionic conductivity, allowing appl…
A model of the effective segregation coefficient keff is obtained by using integral boundary layer analysis. The model provides a simple relation between keff and the actual physical thickness of the solute layer δD, the convective velocity in the solute boundary layer VD, the equilibrium segregation coefficient k, th…
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One of the important aims of modern polymer research is to achieve an understanding of molecular chain conformation and of the spatial arrangement of the polymer molecules in the solid state. In attempts to solve this problem and to interpret the physical properties of high polymers, it is necessary to remember that a…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTCollapse-stretching transition for polymer brushes: preferential solvationP. Auroy and L. AuvrayCite this: Macromolecules 1992, 25, 16, 4134–4141Publication Date (Print):August 1, 1992Publication History Published online1 May 2002Published inissue 1 August 1992https://pubs.a…
AesrRAcr The apparent SiO bond lengths recorded for silicates over a range oftemperatures either typically are invariant or exhibit a contraction with increasing temperature. A rigid-body thermal analysis was completed for the tetrahedra in nine silicates whose structures have been determined over a range of temperatu…
Poly(4-methyl-l-pentene) (PMP) is a linear α-polyolefin with isobutylbranches and with very interesting properties. From a practical point of view. PMP presents high optical transparency. relatively high thermal stability and chemical resistance. in addition to excellent dielectric characteristics and microwave transp…
Effects of salinity on the mineral composition, growth and physiology of field-grown sultana grapevines were studied by adding NaCl solution to River Murray water. Five salt treatments, ranging between 0.37 and 3.47 dS m-l, were applied for six seasons. Petiole levels of Cl and Na were better predictors of yield than…
The relationship between fibre strength loss and cellulose degree of polymerization (D.P.) was examined for different pulps and chemical treatments in an effort to understand the cause of fibre strength loss a high -cellulose contents. Is was found that the decrease in fibre strength is caused by the degradation of ce…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTFacial amphiphilesYuan Cheng, Douglas M. Ho, Craig R. Gottlieb, Daniel Kahne, and Michael A. BruckCite this: J. Am. Chem. Soc. 1992, 114, 18, 7319–7320Publication Date (Print):August 1, 1992Publication History Published online1 May 2002Published inissue 1 August 1992https://…
Brucite-related double layer structures are characterized by a regular but distinct stacking of [Me2x+Me3+ (OH)2x+2]+ octahedral layers with ordered cation distribution and usually x = 2 or x = 3, alternating with anionic {A·nH2O}- interlayers. The stacking sequence of the layers is rhombohedral (3R) or hexagonal (2H)…
The effect of different growth conditions on the glycogen and poly-β-hydroxybutyrate (PHB) content of the cyanobacterium Spirulina maxima is described. Under photoautotrophic growth conditions without any nutrient limitation, S. maxima exhibited a glycogen content of between 7.1 and 10.7% of cell dry wt, whereas PHB w…
Polycrystalline monoclinic ( m ), tetragonal ( t ), and cubic ( c ) ZrO 2 , sintered at 1500°C, were annealed in the cubic stability field and rapidly cooled to permit the displacive c → t ′ transformation to occur in compositions containing 0–6 mol% Y 2 O 3 . The bulk fracture toughness of coarse‐grained (> 25 μm)…