Enzyme thermostability and thermoactivity
Michael J. Danson, David W. Hough, Rupert J.M. Russell, Garry L. Taylor, Laurence Pearl; Enzyme thermostability and thermoactivity, Protein Engineering, Design
Materials Literature
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Magnesium calcite crystallizatin from water–alcohol mixtures
Magnesium calcite with unusual magnesium contents up to 14 mol% crystallizes from water–alcohol mixtures. Morphological changes result from interactions of solvent and Mg2+ with specific planes of the growing crystals.
Pyridineselenolate Complexes of Copper and Indium: Precursors to CuSex and In2Se3
The pyridineselenolate (2-Se-NC(5)H(4), (SePy)) and the 3-(trimethylsilyl)pyridineselenolate (3-Me(3)Si-2-Se-NC(5)H(4) (SePy)) ligands form air-stable homoleptic coordination compounds of Cu(I) { [Cu(SePy)](4) (1) and [Cu(SePy)](4) (2)} and In(III) {In(SePy)(3) (3) and In(SePy)(3) (4)}. Mass spectroscopic characteriza…
Structural Study of Cholesteryl Anthraquinone-2-carboxylate (CAQ) Physical Organogels by Neutron and X-ray Small Angle Scattering
Physical organogels of cholesteryl anthraquinone-2-carboxylate (CAQ) and an organic liquid have been studied by small-angle neutron and X-ray scattering techniques. The gel structure consists of long and rigid fibers of CAQ interconnected in swollen lyotropic microdomains. The nature of the “junction zones” of the thr…
Investigation of Tetraalkylammonium Bromide Stabilized Palladium/Platinum Bimetallic Clusters Using Extended X-ray Absorption Fine Structure Spectroscopy
Structural investigations using EXAFS spectroscopy and standard analytical methods were performed on electrochemically synthesized tetrabutylammonium bromide stabilized Pd/Pt bimetallic clusters with different Pd/Pt ratios. The results of these investigations allow the determination of a detailed model concerning the…
Cyclic Aromatic Disulfide Oligomers: Synthesis and Characterization
A series of cyclic aromatic disulfide oligomers have been synthesized in high yields by catalytic oxidization of arenedithiols in DMAc. The aryl groups contain moieties such as ketone, sulfone, isopropylidene, ether, thioether, and phenylphosphine oxide groups. The cyclic aromatic disulfide oligomers have been analyze…
Synthesis, Physicochemical Properties, and Biological Evaluation of Hydroxypyranones and Hydroxypyridinones: Novel Bidentate Ligands for Cell-Labeling
The synthesis of a range of hydroxypyranones and hydroxypyridinones with potential for the chelation of indium(III) is described. The crystal structures of two of the indium complexes are presented. The distribution coefficients of the ligands and the corresponding iron(III), gallium(III), and indium(III) complexes ar…
Chemistry in Molten Alkali Metal Polyselenophosphate Fluxes. Influence of Flux Composition on Dimensionality. Layers and Chains in APbPSe 4 , A 4 Pb(PSe 4 ) 2 (A = Rb, Cs), and K 4 Eu(PSe 4 ) 2
The reaction of Pb and Eu with a molten mixture of A(2)Se/P(2)Se(5)/Se produced the quaternary compounds APbPSe(4), A(4)Pb(PSe(4))(2) (A = Rb,Cs), and K(4)Eu(PSe(4))(2). The red crystals of APbPSe(4) are stable in air and water. The orange crystals of A(4)Pb(PSe(4))(2) and K(4)Eu(PSe(4))(2) disintegrate in water and o…
Group refractive index measurement of dry and hydrated type I collagen films using optical low-coherence reflectometry
The group refractive index and physical thickness of dry and hydrated type I collagen films are measured using optical low-coherence reflectometry. The average value for the group refractive index of dry and fully hydrated collagen films at lo = 850 nm is, respectively, 1.53 6 0.02, and 1.43 6 0.02. The physical thick…
Ordered Phases in Rod−Coil Diblock Copolymers
We study spatially ordered phases in a rod−coil diblock copolymer melt. In the weak segregation limit, we solve the self-consistent field equations by a partial numerical evaluation of the single chain partition function. In the strong segregation limit, we resort to a brushlike approximation. The structural asymmetry…
Study on the Dispersion of Nickel Ions in the NiO−MgO System by X-ray Absorption Fine Structure
NiO−MgO samples (Ni x Mg 1- x O: x = moles of Ni/(moles of Ni + moles of Mg)) were prepared by impregnation of MgO powder with an aqueous solution of Ni(NO 3 ) 2, followed by calcination at 773 K. The dispersion of Ni ions in these samples has been studied by X-ray diffraction (XRD), X-ray photoelectron spectroscopy (…
Ultrasonic intensification of chemical processing and related operations : A review
Chemical activation and process intensification is provided through ultrasonically-induced cavitation in a liquid medium, a process often described as sonochemistry. Examples are chosen from a number of fields which illustrate the wide ranging applicability of this technology in the chemical and processing industries.…
Polyoxometalate Catalyst Precursors. Improved Synthesis, H+-Titration Procedure, and Evidence for 31P NMR as a Highly Sensitive Support-Site Indicator for the Prototype Polyoxoanion−Organometallic-Support System [(n-C4H9)4N]9P2W15Nb3O62
An improved synthesis of the prototype polyoxoanion−organometallic-support system, P 2 W 15 Nb 3 O 62 9 -, as its organic solvent-soluble all-[( n -C 4 H 9 ) 4 N] + salt is described. The improvements result in a 30% faster procedure which also provides a 60% increase in yield of [( n -C 4 H 9 ) 4 N] 9 P 2 W 15 Nb 3 O…
UV–VIS–NIR and Raman spectroelectrochemistry of regioregular poly(3-octylthiophene): comparison with its non-regioregular analogue
Spectroelectrochemical behaviour of regioregular poly(3-octylthiophene) has been investigated using UV–VIS–NIR and Raman spectroscopies. Static and dynamic UV–VIS–NIR spectroelectrochemical experiments combined with cyclic voltammetry show that oxidative doping of the regioregular polymer is a two-step process in whic…
Diastereoselective Photochromism of an (R)-Binaphthol-Condensed Indolylfulgide
Two new thermally irreversible photochromic ( R )-binaphthol-condensed indolylfulgides (with a 1-(1,2-dimethyl-3-indolyl)-2-methylpropylidene group and with a 1-(1,2-dimethyl-3-indolyl)butylidene group, 6 and 7, respectively) were synthesized. Because of rapid thermal equilibration between the conformational isomers o…
Bimetallic Colloids: Silver and Mercury
Mercury ions, Hg 2+, are radiolytically reduced in an aqueous silver sol. The plasmon absorption band of silver is blue-shifted, which is explained by the formation of a solid mercury layer around the silver particles. The metal deposition stops when the silver particles carry about two monolayers of mercury and the a…
Kinetics of Stochastic Charge Transfer and Recombination Events in Semiconductor Colloids. Relevance to Photocatalysis Efficiency
We report stochastic calculations in compact 2-D lattices modeling the competition between electron−hole recombination and reactive processes on the surface of illuminated TiO 2 colloidal particles. Computer simulations in which holes perform unbiased random walks, react with oxidizable donors, or neutralize stationar…
An Appraisal of Tetraethylsulfamide as Plasticizer for Poly(ethylene oxide)−LiN(CF3SO2)2 Rubbery Electrolytes
Tetraethylsulfamide (TESA), (CH 3 CH 2 ) 2 NSO 2 N(CH 2 CH 3 ) 2, is a nonvolatile liquid of moderate permittivity (ε = 29) that exhibits a good stability toward reducing agents. This glass-forming liquid ( T g = −111 °C) is compared to propylene carbonate (PC, ε = 65, T g = −110 °C) as diluent for PEO−LiN(CF 3 SO 2 )…
A New Negative-Type Photosensitive Polyimide Based on Poly(hydroxyimide), a Cross-Linker, and a Photoacid Generator
A negative working photosensitive polyimide based on poly(hydroxyimide) (PHI), 2,6-bis(hydroxymethyl)-4-methylphenol (BHMP) as cross-linker, and photoacid generator diphenyliodonium 9,10-dimethoxyanthracene-2-sulfonate (DIAS) has been developed. The PHI was prepared by the ring-opening polyaddition of 4,4‘-hexafluoroi…
Crystal Structure of Form I of Syndiotactic Polypropylene
The crystal structure of the stable crystalline form of syndiotactic polypropylene (s-PP) may be taken, only as a first approximation, as body-centered orthorhombic and described in the space group Ibca (in which the chains maintain their full, ideal 2 1 22 symmetry). Indeed, the splitting of the resonance of the meth…