Materials Literature
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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…
The clpA gene that encodes the ATPase subunit of the ATP-dependent protease Ti (Clp) in Escherichia coli contains a putative internal translational initiation site. Here we show that mutagenesis of its 5'-end AUG codon resulted in an exclusive synthesis of the 65-kDa protein (ClpA65), while mutation at the internal 16…
The paper discusses the effect of the TL output decrease with a simultaneous growth of the peak emission intensity in dosimetric crystals of the anion defective a-Al2O3 at higher heating rates. This effect appeared to be directly related to the decrease of TL efficiency due to thermal quenching.
Cyclic voltammetry and polarization measurements on nickel under reducing gas atmospheres were performed to investigate the corrosion behavior of nickel as a base metal for molten carbonate fuel‐cell separator plate alloys. The anodic reactions observed are oxidation of hydrogen, oxidation of nickel to nickel oxide an…
Abstract Physical blends of polycarbonate (PC) with polycarprolactone (PCL), containing 0 to 30% PCL were prepared by melt mixing. The compatible blends were studied using differential scanning calorimetry (DSC), dynamic mechanical analysis (DMA), mechanical testing, rheological and density measurements. Yield strengt…
Abstract The title complex was synthesized by the reaction of copper(I) iodide and tetrakis(ethylthio)tetrathiafulvalene (TTC2-TTF) in acetonitrile under argon atmosphere. The new compound, [(CuI)2TTC2-TTF], crystallizes in the monoclinic system, space group P21/m with unit-cell dimensions a = 9.843(2), b = 12.946(2),…
Abstract Electroactive 2,2′: 6,2″‐terpyridinyl ligands ( 3, 5, 6 ) and their iron(II) ( 7a–9a ) and ruthenium(II) complexes ( 7b–9b ) were synthesized. Bis[3‐(aminophenyl)‐2,2′ :6,2″‐terpyridinyl]metal(II) complexes ( 7a, 7b ) and bis[2‐(hydroxyphenyl)‐2,2′ :6,2″‐terpyridinyl]metal(II) complexes ( 8a, 8b ) were electr…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTConducting Polymers from Polybutadiene: Molecular Configuration Effects on the Iodine-Induced Conjugation ReactionsLiming Dai, Albert W. H. Mau, Hans J. Griesser, and David A. WinklerCite this: Macromolecules 1994, 27, 23, 6728–6735Publication Date (Print):November 1, 1994Pu…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTFormation of a Flexible Graphite Film from Poly(acrylonitrile) Using a Layered Clay Film as TemplateTakashi Kyotani, Toshiki Mori, and Akira TomitaCite this: Chem. Mater. 1994, 6, 11, 2138–2142Publication Date (Print):November 1, 1994Publication History Published online1 May…