Materials Literature
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Bacterial DsbC proteins are involved in rearranging or reducing mismatched disulfide bonds folding within the periplasm. The X-ray structure of the enzyme from Haemophilus influenzae has been solved and compared with the known structure of the Escherichia coli protein. The proteins act as V-shaped dimers with a large…
A laser assisted zone melting process has been used to texture large Bi-2212 planar polycrystalline samples with approximate dimensions 100 mm × 10 mm × 1 mm using a high power diode laser. In this technique, the temperature of the support strongly affects the microstructure and the superconducting properties of the t…
For more than forty years, the experimental determination and analysis of electron densities have played a fundamental role in advances in the chemical bond concept. The present paper illustrates the application of this approach to the field of molecular magnetism with examples that recently appeared in the literature…
The nucleation and growth of $\mathrm{Ag}$ nanocrystals, embedded in an initially homogeneous and supersaturated $\mathrm{Ag}$-doped sodium borate glass, were studied by in situ small-angle x-ray scattering (SAXS) during isothermal annealing at different temperatures, from 813 up to 843 K. The SAXS results correspondi…
Abstract Poly( L ‐lactic acid) (PLLA: M w = 19.4 × 10 4 )/poly(ethylene glycol) (PEG: M w = 400) blend films were formed by use of a solvent‐cast technique. The properties and structures of these blend films were investigated. The Young's modulus of the PLLA decreased from 1220 to 417 MPa with the addition of PEG 5 wt…
Accurate low-order Fourier coefficients of the crystal potential of SrTiO(3) are measured by quantitative convergent-beam electron diffraction. The accuracy in the corresponding derived X-ray structure factors is about 0.1% for the strong low-order reflections (sin theta/lambda < 0.3 A(-1)). This accuracy is better th…
Abstract Two new adsorbents [β‐cyclodextrin–chitosan (β‐CD–CTS) and β‐cyclodextrin‐6–chitosan (β‐CD‐6‐CTS)] were synthesized by the reaction of β‐cyclodextrin (β‐CD) with epoxy‐activated chitosan (CTS) and the sulfonation of the C‐6 hydroxyl group of β‐cyclodextrin with CTS, respectively. Their structures were confirm…
APRV (Automatic Processing, Refinement and Visualization) is a new program that enables high-throughput batch processing of crystallographic data. The program combines processing of raw diffraction images, initial structure refinement and visual inspection of resulting electron density into a seamless one-step procedu…
The crystal structure of serine acetyltransferase (SAT) from Haemophilus influenzae Rd determined at 2.7 A resolution is presented. SAT is a member of a family of hexapeptide-containing transferases that contain six-residue tandem repeats (LIV)-G-X(4) that have been shown to form left-handed parallel beta-helices. In…
A topic of current interest is engineering surface mutations in order to improve the success rate of protein crystallization. This report explores the possibility of using metal-ion-mediated crystal-packing interactions to facilitate rational design. Escherichia coli apo acyl carrier protein was chosen as a test case…
The metal NMR parameters of the complexes [(NC)(5)Pt-Tl(CN)(n)](n -) (n = 0-3, I-IV) and [(NC)(5)Pt-Tl-Pt(CN)(5)](3-) (V), as well as [{Pt(NO(3))(NH(3))(2)L(2)}Tl(NO(3))(2)(MeOH)] (VI) and [{Pt(NO(3))(NH(3))(2)L(2)}(2)Tl](+) (VII) with L = NHCO(t)Bu, were computationally investigated by relativistic density functional…
Rasvumite, KFe 2 S 3 , belongs to a group of rare iron bearing alkali sulphide minerals together with erdite, bartonite, djerfisherite and others occurring in mafic alkaline rocks on the Kola peninsula (Russia) or Coyote Peak in California (USA) [1]. KFe 2 S 3 has been synthesized hydrothermally in microcrystalline ap…
The shadowing of the primary beam and of reflections from a powder crystal sample enclosed in a diamond-anvil high-pressure cell (DAC) is described for unrestricted data-collection procedures. The corrections account for the shadowing of the data measured with point- or area-detector diffractometers and can be applied…
Abstract PA1010/TPU blends were prepared by melt blending. The melting, crystallization behavior, and isothermal crystallization kinetics were investigated using differential scanning calorimetry (DSC). The results showed that the DSC thermograms of blend samples exhibit double melting peaks. With increasing the TPU c…
Carbon nanotubes were synthesized in an atmospheric chamber by irradiating a metal-catalyst containing graphite target with a 2 kW continuous wave CO2 laser and capturing the soot in flowing distilled water to facilitate continuous, rapid production. The ablation products, swept away by an argon flow and collected in…
J. ZEKONYTE, V. ZAPOROJTCHENKO, S. WILLE, U. SCHUERMANN and F. FAUPEL* Technical Faculty, Chair for Multicomponent Materials, Kiel University, Kaiserstrasse 2, 24143 Kiel, Germany 1. INTRODUCTION The metallization of polymers with noble metals has been of interest in recent years, not only from a fundamental point of…
Abstract The effect of nanomaterials on the solid‐state polycondensation (SSP) of PET was investigated using intrinsic viscosity measurement, wide‐angle X‐ray diffraction, differential scanning calorimetry, and polarizing microscope. The results showed that the montmorillonite nanomaterials could greatly increase the…
The nuclear shielding of (99)Ru in a wide variety of complexes was investigated computationally by DFT methods, including relativistic effects (by means of the Pauli and ZORA approximations), up to spin-orbit coupling and Slater all-electron or frozen-core basis sets. Mononuclear complexes, a trinuclear cluster and a…
Abstract The room‐temperature solid‐state reaction of silver acetate with TabHPF 6 [Tab = 4‐(trimethylammonio)benzenethiolate] followed by recrystallization from MeCN afforded a unique octadecanuclear silver thiolate complex [Ag 9 (Tab) 8 (MeCN) 8 ] 2 (PF 6 ) 18 ·4MeCN ( 1 ). An X‐ray analysis of 1 revealed that the s…
A series of two dimensional close-packed $\mathrm{Co}$, $\mathrm{NiFe}$, and $\mathrm{CoFe}∕\mathrm{Cu}∕\mathrm{NiFe}$ magnetic particle arrays, in which the particles have mean diameters of $34\phantom{\rule{0.3em}{0ex}}\mathrm{nm}$, thicknesses of $5--20\phantom{\rule{0.3em}{0ex}}\mathrm{nm}$, and periodicity of $56…