Interactions between expanded porphyrins and nucleic acids
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A re‐evaluation of magnetocrystalline anisotropy and magnetostriction constants
The standard theory of magnetocrystalline anisotropy for a rigid ferromagnetic body, with cubic symmetry, makes use of a “zero strain” anisotropy constant K 1 . If the effect of magnetostriction is taken into account, this constant must be replaced by a “zero stress” anisotropy constant K′ 1 which differs from K 1 by…
Immobilized Biosystems
This book provides an overview of the immobilization of viable and non-viable cells, proteins, enzymes and active molecules, and their interaction with natural or synthetic carriers for performing bio
Tropothione S-Oxide: The First Example of a Sulfine Charge Reversion (Umpolung)
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTTropothione S-Oxide: The First Example of a Sulfine Charge Reversion (Umpolung)Takahisa Machiguchi, Toshio Hasegawa, Hiroyuki Otani, Shinichi Yamabe, and Hiroshi MizunoCite this: J. Am. Chem. Soc. 1994, 116, 1, 407–408Publication Date (Print):January 1, 1994Publication Histo…
Heat Transfer in Hydride Packed Beds. II. A New Experimental Technique and Results on LaNi5 Powder*
Article Heat Transfer in Hydride Packed Beds. II. A New Experimental Technique and Results on LaNi5 Powder* was published on January 1, 1994 in the journal Zeitschrift für Physikalische Chemie (volume 183, issue 1-2).
Effects of Fluidity and Vesicle Size on Antitumor Activity and Myelosuppressive Activity of Liposomes Loaded with Daunorubicin.
The effects of fluidity and vesicle size on the antitumor activity and myelosuppressive activity of liposomes loaded with daunorubicin, an anthracycline antitumor drug, were investigated in Yoshida sarcoma-bearing rats. Liposomes composed of egg phosphatidylcholine (EPC) or hydrogenated egg phosphatidylcholine (HEPC),…
Long-circulating liposomes.
Liposomes have attracted a considerable amount of interest for potential use as a drug delivery system due to their suitable characteristics. However, the predominant uptake of liposomes by the reticuloendotherial system (RES) and a resulting rapid clearance from circulation have been a major obstacle in any attempt t…
Mechanism of Oxidation of Low-Oxygen SiC Fiber Prepared by Electron Radiation Curing Method
The mechanism of oxidation of a low-oxygen SiC fiber prepared by the electron radiation curing method was investigated. The oxidation rates were measured with a thermobalance in O2 at temperatures from 1373 to 1773K. The reaction products were examined by X-ray diffraction and SEM observation. The oxide film was amorp…
The Application of AC Impedance Technique to Atmospheric Corrosion Study
Electrochemical impedance spectroscopy has been applied to study atmospheric corrosion. A two electrode cell type atmospheric corrosion probe has been constructed. Quantitative analysis on IR drop and current distribution on the electrode, which produce serious errors in electrochemical measurements of corrosion rate…
Lewis basicity of the [Co 4 O 4 ] 4+ cubane core. Preparation of a mixed-valence (4Co II , 4Co III ) cluster with an unusual [Co 8 (µ 4 -O) 4 ] 2+ core, and new [Co 4 O 3 (OH)] 5+ and [Co 4 O 2 (OH) 2 ] 6+ cubane complexes
[Co8O4(O2CPh)12(MeCN)3(H2O)]1b is formed on oxidation of cobalt(II) benzoate in MeCN or dmf with aqueous H2O2, and contains a [Co4O4]4+ cubane unit with each oxide attached to an additional Co atom; studies stimulated by this result show that preformed [Co4O4(O2CR)2(bipy)4]2+(bipy = 2,2′-bipyridine) can be mono- and d…
Advanced fiber spinning technology
Fundamentals of spinning Melt spinning Solution spinning Spinning for nonwovens The spinning of highly aesthetic fibres Fibre spinning of anisotropic polymers Spinning of thermotropic liquid-crystal polymers Gel spinning processes Spinning of ultra-fine fibres Spinning of optical fibres.
Effect of composition on the lattice parameters and thermal behaviour of nickel( II )–cobalt( II ) hydroxide nitrate solid solutions
A series of coprecipitated nickel(II)–cobalt(II) hydroxide nitrate samples with different cationic compositions has been studied by means of X-ray diffraction, infrared spectroscopy and thermal analysis. A continuous series of solid solutions NixCo2–x(OH)3NO3(0⩽x⩽2) is formed between the end members Ni2(OH)3NO3 and Co…
Polypyrrole film formation by solution-surface electropolymerization: influence of solvents and doped anions
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTPolypyrrole film formation by solution-surface electropolymerization: influence of solvents and doped anionsSeungjun Lee, Hyunkyung Sung, Sujung Han, and Woonkie PaikCite this: J. Phys. Chem. 1994, 98, 4, 1250–1252Publication Date (Print):January 1, 1994Publication History P…
Comparison between water-treed and deteriorated regions. Electrical tree precursor
When polyethylene is subjected to high fields in the presence of water, a water tree may be formed. However, under dry conditions a 'deteriorated region' is gradually formed before the initiation of an electrical tree. The experimental results suggest some similarities in structure and properties between the deteriora…
Molecular theory of elastic constants of liquid crystals. II. Application to the biaxial nematic phase
The expression of distortion free energy derived in our earlier paper [Phys. Rev. A 45, 974 (1992)] is used to derive expressions for the 12 elastic constants of a biaxial nematic phase. These expressions are written in terms of order parameters characterizing the nature and amount of ordering in the phase and the str…
Preparation and characterization of multiple ion-exchanged Pt/TiO 2 catalysts
The amount of platinum introduced by ion exchange on TiO2 anatase (63 m2 g–1) can be increased by repeating the exchange procedure after reduction of the catalyst under hydrogen. From IR spectroscopy studies, two kinds of Lewis acid sites on the TiO2 support (α and β sites) have been found to participate in the ion-ex…
Structural phase of femtosecond-laser-melted graphite
We have used Raman scattering to investigate the effects of intense laser pulses on the structure of resolidified graphite. Graphite was irradiated with 0.325--3.25-J/${\mathrm{cm}}^{2}$, 620-nm, 90-fs single-laser pulses causing it to melt and rapidly resolidify. Raman studies of the resolidified carbon in the crater…
Synthesis of materials for molecular electronic applications
M. C. Grossel and S. C. Weston, Contemp. Org. Synth., 1994, 1, 367 DOI: 10.1039/CO9940100367
Diatom aggregates from the open ocean
Diatom aggregates composed of one to many chains of Pseudonitzschia pseudodelicatis-sima were abundant (up to 10% of the autotrophic biomass) in high-nutrient open-ocean regions of both the equatorial Pacific and north Atlantic. The chains were connected at a central mass composed of fecal material. The morphology is…
Carbon cluster structures and stabilities predicted from solid-state potentials
An empirical potential-energy function comprising two- and three-body terms, whose parameters have been determined from the properties of diamond and graphite, is used to study the structures and energies of carbon microclusters.The binding energy per atom of smaller linear clusters increases monotonically with the nu…