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Construction of a DNA four-way junction: Design and NMR spectroscopy

20-Jan-2005 | Cornelis Altona, Jeroen A. Pikkemaat, Molecular Engineering, 2005

In 1964 Holliday postulated the formation of cruciform structures (four-way junctions) in duplex DNA as intermediate in genetic recombination. Since then, many biochemical and biophysical investigations were directed at solving questions concerning structural details of stable four-way junctions. ...


Three-Dimensional Fusion of Multispectral Secondary Ion Mass Spectrometry Images

30-Nov-2004 | Thomas C. Stubbings, Herbert Hutter, Journal of Computer-Assisted Microscopy, 2004

Imaging secondary ion mass spectrometry (SIMS) is a powerful surface analysis tool capable of producing two-(2D) and three-dimensional (3D) spatially resolved images of element distributions. Both the 2D and the 3D imaging mode produce multispectral images, i.e., each image stack visualises the ...


Mass-Spectrometric Study of the Temperature Variation in the Dimer-to-Monomer Ratio in the Free-Surface Vaporization Fluxes from Alkali Halide Single Crystals

03-Nov-2004 | M. F. Butman, A. A. Smirnov, L. S. Kudin, Z. A. Munir, Journal of Materials Synthesis and Processing, 2004

A mass-spectrometric method is used to investigate the kinetics of the vaporization of LiF (970–1070 K), NaCl (722–889 K), KCl (780–900 K), KBr (724–918 K), and CsI (656–838 K) single crystals. A dimer-to-monomer ratio, JD/JM, in the fluxes vaporizing from free surfaces of these crystals are ...


Formation of Nanosized Metal Particles of Cobalt, Nickel, and Copper in the Matrix of Layered Double Hydroxide

03-Nov-2004 | K. A. Tarasov, V. P. Isupov, B. B. Bokhonov, Yu. A. Gaponov, B. P. Tolochko, M. R. Sharafutdinov, S. S. Shatskaya, Journal of Materials Synthesis and Processing, 2004

Vacuum heating of the layered compounds of lithium–aluminium double hydroxide pillared with copper, cobalt, and nickel complexes of ethylenediamine tetraacetic acid (EDTA) was shown to give rise to composite materials containing in the lamellar aluminate matrix nanosized metal particles stable to ...


Conversion of the Echinoderm Mellita eduardobarrosoi Calcite Skeleton into Porous Hydroxyapatite by Treatment with Phosphated Boiling Solutions

03-Nov-2004 | M. A. Araiza, J. Gómez-Morales, R. Rodríguez Clemente, V. M. Castaño, Journal of Materials Synthesis and Processing, 2004

The influence of the boiling solution technique (a nonhydrothermal wet treatment) in the formation of hydroxyapatite (HA) from a novel source, an echinoderm known as Mellita eduardobarrosoi, whose skeleton contains calcite as an inorganic constituent, was investigated. The experimental plan ...


Fabrication of Monolithic Ti3SiC2 Ceramic Through Reactive Sintering of Ti/Si/2TiC

03-Nov-2004 | J. T. Li, Y. Miyamoto, Journal of Materials Synthesis and Processing, 2004

Fabrication of monolithic Ti3SiC2 has been investigated through the route of reactive sintering of Ti/Si/2TiC mixtures. Significant phase differences existed between the surface and the interior of as-synthesized products due to the evaporation of Si during the reaction process. The use of a ...


Study of a Pure-Ge/Si Short-Period Superlattice by X-Ray Double Crystal Diffraction

03-Nov-2004 | Zhenguo Ji, Huanming Lu, Shiguo Zhang, Duanlin Que, N. Usami, H. Sunamura, Y. Shiraki, Journal of Materials Synthesis and Processing, 2004

Pure-Ge/Si short-period superlattice (SPS) samples consisting of 1.5-monolayer Ge and a 1.4- to 3.8-nm-thick Si layer grown by gas source molecular beam epitaxy (GS-MBE) were studied by double-crystal x-ray diffraction. For SPS with a Si layer less than 2.4 nm, the satellite peak caused by the ...


Optimization of PVD Parameters for the Deposition of Ultrahard Ti–Si–B–N Coatings

03-Nov-2004 | D. V. Shtansky, E. A. Levashov, A. N. Sheveiko, J. J. Moore, Journal of Materials Synthesis and Processing, 2004

Multicomponent Ti–Si–B–N coatings were deposited on high-speed steel (HSS) substrates by reactive magnetron sputtering using a SHS TiB + 20 wt% Si target. The influences of the substrate temperature, bias voltage, and nitrogen partial pressure on the structure and the elemental compositions of ...


Investigation of Fine-Dispersion Silicon Nitride and Oxinitride Powders Manufactured by Titanium–Magnesium Production Waste Nitriding

03-Nov-2004 | M. V. Vlasova, V. A. Lavrenko, L. D. Dyubova, T. V. Tomila, L. P. Isayeva, V. P. Smirnov, Journal of Materials Synthesis and Processing, 2004

The nitriding of titanium–magnesium production waste containing chlorine was studied using X-ray, IR, EPR, and EPMA techniques as well as chemical and mass spectrometry analyses. It was established that the high-dispersion system, consisting mainly of silicon nitride and oxinitride, formed in the ...


Modelling the Solidification Microstructure Formation of Cobalt Dendritic Alloys

03-Nov-2004 | H. Mancha-Molinar, F. Cepeda-Tijerina, M. M. Cisneros-Guerrero, J. Méndez-Nonell, J. Orona-Hinojos, Journal of Materials Synthesis and Processing, 2004

In the present work a mathematical model has been developed to explain the microstructure characteristics obtained during the solidification process of dendritic cobalt alloys, under ordinary low cooling rate conditions. The model, taking into account physical aspects such as undercooling, ...


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