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Abstract A peak‐to‐background method was implemented for standardless electron microprobe analysis of bulk samples and particles. First, a study on the choice of the beam entry point was performed; the region of the particle closest to the detector proved to be the most convenient. Then, a very simple algorithm, which…
Telomers of perfluoropropylene with alpha,omega- diiodoperfluoroalkanes were converted to branched-chain difunctional condensation monomers. The reaction of ethylene with the telomers gave alpha, omega-bis(iodoethyl)perfluoroalkanes, which were converted to the corresponding diols by reaction with fuming sulfuric acid…
Equilibrium constants and enthalpy changes for reactions catalyzed by the hydrolase class of enzymes have been compiled. For each reaction the following information is given: The reference for the data; the reaction studied; the name of the enzyme used and its Enzyme Commission number; the method of measurement; the c…
Abstract The crystal structures of the ordinary pressure forms of indium digermanate In 2 Ge 2 O 7 and disilicate In 2 Si 2 O 7 have been studied from X‐ray powder diffraction data by Rietveld refinement. They are closely related to that of the thortveitite which crystallizes in the monoclinic system with the space gr…
Abstract An extrusion‐grade medium‐density polyethylene was fractionated by size exclusion chromatography and selective solvent extraction. The fractions were studied by infrared spectroscopy, differential scanning calorimetry, and transmission electron microscopy. Infrared spectroscopy showed that chain branching was…
Applicability of linear theory to magnetic anisotropy of 3d-4f intermetallics is investigated with particular reference to ${\mathrm{Sm}}_{2}$${\mathrm{Fe}}_{17}$${\mathrm{N}}_{3}$. A general quantitative criterion for the breakdown of the linear theory is established, according to which the theory falls beyond a 20%…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTNMR Studies, Molecular Characterization, and Degradation Behavior of Poly(amido amine)s. 1. Poly(amido amine) Deriving from the Polyaddition of 2-Methylpiperazine to 1,4-Bis(acryloyl)piperazineF. Bignotti, P. Sozzani, E. Ranucci, and P. FerrutiCite this: Macromolecules 1994,…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTDensity Functional Study of Ethylene Dimerization by (Acetylacetonato)nickel HydrideL. Fan, A. Krzywicki, A. Somogyvari, and T. ZieglerCite this: Inorg. Chem. 1994, 33, 23, 5287–5294Publication Date (Print):November 1, 1994Publication History Published online1 May 2002Publis…
Abstract In most, if not all non‐Drosophila insect systems, the study of gene regulation relies on in vitro analyses. With the aim of providing an in vivo assay, we developed an original protocol using the Bombyx mori silk gland, by which the functioning of cloned gene promoters can be efficiently measured. This consi…
The nitridation mechanism of silicon at room temperature under exposure to 100–1000 eV N+2 ion beams has been studied in situ in an ultrahigh vacuum apparatus using x-ray photoelectron spectroscopy. The increase of the nitrogen content in a surface layer as a function of the ion dose was described by a simple formula…
The valves of three diatom species (Achnanthes brevipes, Nitzschia palea and Synedra ulna) maintained in long-term culture were studied with scanning electron microscopy. Abnormalities observed included fragmented and duplicated raphe systems, disrupted orientation of areolae and fibulae, and obscure areolae. It is re…
We investigated the effect of the polymer network, which is made of a liquid crystalline diacrylate in a nematic liquid crystalline host, on the alignment and motion of liquid crystals. We found that the polymer network has strong influence on the alignment and motion of the liquid crystals even with the low concentra…
Successful attempts to produce high-molecular-weight polyanilines via electrochemical synthesis are reported. A systematic study of the influence of electropolymerization conditions on the weight-average molecular weight (Mw) showed that Mw of polyaniline varied only between about 22 000 and 40 000 g mol−1, even for a…
The isotope and hyperfine shifts for the Yb 1S0(6s2) → 3P1(6s6p) transition were determined with an acousto-optic modulator used to frequency shift part of a laser beam. The frequency-shifted and -unshifted laser beams were superimposed and excited an atomic beam. The laser was scanned across the transition while fluo…
The cellulose-binding domain from the scaffoldin subunit of the cellulosome from Clostridium thermocellum strain YS has been expressed in Escherichia coli, purified to homogeneity, and crystallized. Crystals were grown by vapor diffusion using polyethylene glycol as precipitant. They belong to the monoclinic space gro…
Abstract Poly(1,4- or 1,2-phenylenevinylene)s bearing a 2- or 4-substituted nitroxide radical were synthesized by polymerizing [bromo[N-tert-butyl-N-(trialkylsiloxy)amino]]styrenes with a palladium catalyst. The polyradicals were chemically stable, and their ESR and SQUID measurements indicated an intramolecular and t…
Bacteriophage T4 contains a phage-encoded anaerobic ribonucleoside triphosphate reductase, nrdD, previously named sunY. An open reading frame, 55.9, that resides downstream of the phage reductase was observed to have amino acid sequence similarity with the E. coli pyruvate formate-lyase (Pfl) activating enzyme. A stop…
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ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTSynthesis and Multistage Redox Properties of 9,10-Bis(1,3-dithiol-2-ylidene)-9,10-dihydroanthracene Derivatives Functionalized with Ferrocenyl and Tetrathiafulvalenyl UnitsGary J. Marshallsay and Martin R. BryceCite this: J. Org. Chem. 1994, 59, 22, 6847–6849Publication Date…
The intermolecular interactions of the major cold-shock protein from Bacillus subtilis (CspB) in solution in the presence of different salts, including phosphate, have been studied by means of scanning calorimetry and size-exclusion chromatography. Calorimetric results indicate that, in all cases, protein unfolding ca…