Materials Literature
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Intermediatry steps in cellulose synthesis in Acetobacter xylinum were studied with resting cells and particulate-membranous preparations of the wild-type strain and of a celluloseless mutant. Exogenously supplied [1-14C]glucose was rapidly converted by resting cells of both types into glucose 6-phosphate, glucose 1-p…
Abstract EPR of Cu(H 2 O) pseudo Jahn‐Teller (JT) centres in dia‐ and paramagnetic Tutton salt crystals A 2 M(SO 4 ) 2 . 6H 2 O (I) with A = Rb, Cs, NH 4 and M=Zn, Cu and K 2 M(ZrF 6 ) 2 . 6H 2 O (II) crystals in the temperature range 300 to 4.2 K at frequencies 9.5 and 37 GHz is studied. The dynamic JT nature of Cu(H…
Abstract Proton conductivity is an outstanding feature of Al(OH) 3 , Mg(OH) 2 , and Ca(OH) 2 powders between room temperature and their respective dehydration temperatures. It can be measured by using Pd‐black electrodes in H 2 either by d.c. conductivity measurements, applying high injection voltages (> 10 4 V/cm)…
Abstract A prevalent view is that the red clayey parent material (terra rossa) of Crider and associated soils is a residual product from solution of limestone in the karst of southern Indiana. The sharp, abrupt contact between terra rossa and limestone provides no evidence to support the concept of a residual origin f…
Abstract Europium(III) chelates of dibenzoylmethane (DBM) ( 1 ) and β‐diketone‐containing polymers, i.e., poly( p ‐benzoylacetylstyrene) ( 2 ) and poly(aryl β‐diketone) ( 3 ), were prepared. In the polymer 2 the β‐diketone moiety is attached to the phenyl ring, and for polymer 3 the β‐diketone group is incorporated in…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTPreparation and Morphological Properties of a Triblock Copolymer of the ABC TypeYuhshuh Matsushita, Haruhisa Choshi, Teruo Fujimoto, and Mitsuru NagasawaCite this: Macromolecules 1980, 13, 5, 1053–1058Publication Date (Print):September 1, 1980Publication History Published on…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTMolecular Motion in Polycarbonate and Modified PolycarbonatesT. R. Steger, Jacob Schaefer, E. O. Stejskal, and R. A. McKayCite this: Macromolecules 1980, 13, 5, 1127–1132Publication Date (Print):September 1, 1980Publication History Published online1 May 2002Published inissue…
The effect of interfacial decohesion, due to the thermal expansion mismatch, on the thermal diffusivity of a hot‐pressed glass matrix with a dispersed phase of nickel was investigated by the laser‐flash technique at 25° to 600°C. The interfacial gap formed on cooling acts as a barrier to heat flow and lowers the therm…
Microtubule disassembly has been studied using a rapid dilution technique (Karr, T.L., and Purich, D.L. (1979) J. Biol. Chem. 254, 10885-10888). Disassembly curves, generated by computer from the solution of series first order differential equations (see following paper), were fit to experimental data with excellent a…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTCrystal structure and spectroscopic properties of violet glutathione-copper(II) complex with axial sulfur coordination and two copper sites via a disulfide bridgeKiyonori Miyoshi, Yukio Sugiura, Kazuhiko Ishizu, Yoichi Iitaka, and Hikaru NakamuraCite this: J. Am. Chem. Soc.…
Summary Formation of hydroxy‐Al (HA) and hydroxy‐aluminosilicate (HAS) ions was studied in solutions of A1C1 3 , orthosilicic acid and NaOH. Evidence for incorporation of Si into HA is that HA retarded the development of silicomolybdate colour and Si was retained by a cation‐exchanger. The reaction is believed to be m…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTAnalysis of the Room-Temperature Molecular Motions of Poly(ethylene terephthalate)M. D. Sefcik, Jacob Schaefer, E. O. Stejskal, and R. A. McKayCite this: Macromolecules 1980, 13, 5, 1132–1137Publication Date (Print):September 1, 1980Publication History Published online1 May…
A simple mathematical formalism for describing arbitrary hysteresis processes is presented. The information required to apply this formalism to a given magnetic material can be obtained with relatively little effort from experimental hysteresis curves such as normal loops or, in special cases, from just the initial cu…
A discussion is given of various models for the Verwey transition in Fe3O4and Ti4O7, and its apparent absence in Sm3S4. In allsystems there is evidence for polaron formation, and for bipolarons in the first two. It is suggested that, in spite of polaron formation, in low-temperature Fe3O4 there must be considerable ov…
A detailed investigation on the thermal expansion, magnetic properties and electrical resistance of rapidly quenched amorphous (Fe,Co,Ni)-Zr alloys has been undertaken. Magnetic properties of these alloys are reported separately in this conference. The thermal expansion curves exhibit typical invar characteristics bel…
Summary Arsenohauchecornite, Ni 9 BiAsS 8 , and tellurohauchecornite, Ni 9 BiTeS 8 from the Sudbury area, Ontario, are now recognized as distinct mineral species in the Hauchecornite Group and not as varieties as described previously. Descriptions of these two minerals are given, summarized from Gait and Harris (1972).
Summary Twenty surface soils from four main Soil Groups in Malawi and their sub‐soils were divided into three groups based on cation exchange capacity (group I, CEC < 50; group II, 50–100; and group III > 100μeq g –1 ). In each soil group the maximum amounts of K removed by successive extraction with 0.005 M CaC…
The wide obtainable range of mechanical compliance encourages the application of helical magnetostrictive springs in force and pressure transducers as well as for direct displacement sensing. In the usual mode of operation, an alternating current is conducted through the magnetostrictive wire, and an output signal (re…
Summary The name hauchecornite has been applied in the literature to a group of minerals with similar crystal structures and the general formula (Ni,Co,Fe) 9 AB S 8 , where A and B are As, Sb, Bi, and Te in two nonequivalent structural sites. A classification of the group is proposed based on the relative abundance of…
Simple binary alkali borate glasses of differing alkali content (alkali = Li, Na, or K) containing sulfur were prepared and their absorption spectra were measured in the range of 200 to 700 nm. The absorption bands obtained were used to determine the stable states of sulfur in these glasses by directly comparing them…