Materials Literature
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Abstract A series of new mixed‐ligand lanthanide complexes [Ln(hfa) 3 (4‐cpyNO)] 2 (Ln = Sm III –Ho III and Tm III ; hfa – = hexafluoroacetylacetonate; 4‐cpyNO = 4‐cyanopyridine N ‐oxide) have been synthesised by treating the corresponding lanthanide hexafluoroacetylacetonates with 4‐cpyNO (molar ratio 1:1) in chlorof…
Previous studies of symmetry preferences in protein crystals suggest that symmetric proteins, such as homodimers, might crystallize more readily on average than asymmetric, monomeric proteins. Proteins that are naturally monomeric can be made homodimeric artificially by forming disulfide bonds between individual cyste…
The synthesis and photophysical properties of a coordinatively unsaturated cationic dinuclear terbium complex, 2.Tb(2), that can detect the presence of mono- or bis(carboxylates) in buffered aqueous solution at physiological pH is described. Full ligand synthesis and structural characterization of 2.Na(2) are also des…
The protonation constants () of 3,6,9,15-tetraazabicyclo[9.3.1]pentadeca-1(15),11,13-triene-3,6,9-triacetic acid (PCTA) and stability constants of complexes formed between this pyridine-containing macrocycle and several different metal ions have been determined in 1.0 M KCl at 25 degrees C and compared to previous lit…
The crystallization process of isotactic polypropylene (iPP) by heating from the prequenched mesomorphic phase has been studied using wide-angle X-ray diffraction, small-angle X-ray scattering, and optical microscopy. Mesomorphic iPP as quenched shows the well-known nodular structure of ca. 100 Å. In heating process t…
We investigate the rheological properties of microliter quantities of the spinning material extracted ex vivo from the major ampullate gland of a Nephila clavipes spider using two new micro-rheometric devices. A sliding plate micro-rheometer is employed to measure the steady-state shear viscosity of approximately 1 mi…
Abstract XPS has been used extensively to characterise the surface chemistry of materials used in bioengineering. Its ability to characterise both the elemental and chemical structure of the surface makes it particularly useful, as it can be used to identify the chemical functional groups present on the surface of vir…
Pure and composite hydrogel matrices of collagen type I and fibrin were produced by simultaneous polymerization of each biopolymer in the presence of vascular smooth muscle cells. The ratio of collagen to fibrin in composite matrices was varied from 1:1 to 1:4, with corresponding absolute protein concentrations of 1.0…
Purification and opening of carbon nanotubes has been carried out by treatment of as-made single-wall carbon nanotubes (SWNTs) with pure steam at 1 atm pressure. Treated samples have been characterized by high-resolution transmission electron microscopy and IR and Raman spectroscopy. Comparison between the steam purif…
Local electric fields generated by nanopatterned electrodes were used to control the position and orientation of well-isolated as well as closely packed colloidal semiconducting CdTe and CdSe nanorods (NRs) drop-cast from solution. Postdeposition imaging using transmission-electron microscopy and atomic-force microsco…
Cyclometalated platinum(II) complex has been successfully incorporated into the (3-aminopropyl) triethoxysilane-modified channels of ordered mesoporous silica SBA-15 that has large pore hexagonal channels. Studies on the (1)O(2) generation conclusively demonstrates that the olefins in the nano-channels of SBA-15 can b…
Wheelin' and dealin': The M10 molecular wheels [M10(OMe)20(O2CR)10] (M=Ga, R=Me; M=Fe, R=Ph) were modified to M18 wheels in a nontemplate synthesis upon incorporation of a diolate ligand (see space-filling model of [Ga18(pd)12(pdH)12(O2CMe)6(NO3)6]6+; Ga yellow, O red, N blue, C gray; pdH2=1,3-propanediol). Remarkably…
PURPOSE OF REVIEW: Nephrogenic systemic fibrosis, also known as nephrogenic fibrosing dermopathy, was first documented in 1997 as a scleroderma-like fibrosing entity of the skin in association with renal insufficiency. Rheumatologists, along with other specialists, may be the first to encounter these patients; and bot…
A database of invarioms for structural refinement of amino-acid, oligopeptide and protein molecules is presented. The spherical scattering factors of the independent atom or promolecule model are replaced by ;individual' aspherical scattering factors that take into account the chemical environment of a bonded atom. Al…
Most self-assembled quantum dot molecules are intrinsically asymmetric with inequivalent dots resulting from imperfect control of crystal growth. We have grown vertically-aligned pairs of InAs/GaAs quantum dots by molecular beam epitaxy, introducing intentional asymmetry that limits the influence of intrinsic growth f…
We present a comparative study of the excitations in bulk and liquid D2 confined within the pores of MCM-41. The material (Mobile Crystalline Material-41) is a silicate obtained by means of a template that yields a partially crystalline structure composed by arrays of nonintersecting hexagonal channels of controlled w…
A free-base cofacial bisporphyrin, H(4)DPOx, forms a pi-complex with acridinium ion (AcH(+)) by pi-pi interaction in benzonitrile (PhCN). Formation of the H(4)DPOx-AcH(+) pi-complex was probed by UV-vis and NMR spectroscopy. The binding constant between AcH(+) and H(4)DPOx is determined as 9.7 x 10(4) M(-)(1). Photoin…
Abstract Conservation of food products depends on product quality and packaging suitability. The objective of this work was to develop and evaluate the antimicrobial efficiency of natamycin‐incorporated film in the production process of Gorgonzola cheese. It aims to optimize the production process and increase shelf‐l…
A combination of ab initio calculations and experimental methods (high-resolution neutron and powder X-ray diffractions) was used to solve the crystal structure of Mg x Mo 6 S 8 ( x = 1 and 2). It was shown that at room temperature, the latter are similar to the crystal structure of classic Chevrel phases (CPs) such a…
In this work, we present our theoretical results for the equation of state and the phonon dispersions of MnAs, as well as the Mn concentration dependence of both the lattice parameter and the phonon frequencies of the cubic GaMnAs alloys. The results are in good agreement with the experimental results whenever this co…