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O. S. Pilipenko L. F. Atyaksheva O. M. Poltorak E. S. Chukhrai 《Russian Journal of Physical Chemistry A, Focus on Chemistry》2007,81(6):990-994
The dissociation of oligomer forms of bacterial Escherichia coli, yeast Kluyveromices fragilis, and bovine liver β-galactosidases was studied. The catalytic constants for the dimers and tetramers of the bacterial enzyme, dimers and monomers of the animal enzyme, and dimers of the yeast enzyme in the reaction of hydrolysis of 2-nitrophenyl-β-D-galactopyranoside were determined. At 25°C, these values were found to be 180 and 400 s?1 for the bacterial enzyme, 0.01 and 0.08 s?1 for the bovine liver enzyme, and 45.4 s?1 for the yeast enzyme, respectively. The other oligomer forms of the β-galactosidases were inactive under conditions of these experiments. 相似文献
66.
A sharp interface model of crack propagation as a phase transition process is discussed. We develop a multipole expansion technique to solve this free boundary problem numerically. We obtain steady state solutions with a self-consistently selected propagation velocity and shape of the crack, provided that elastodynamic effects are taken into account. Also, we find a saturation of the steady state crack velocity below the Rayleigh speed, tip blunting with increasing driving force, and a tip splitting instability above a critical driving force. 相似文献
67.
P. I. Gaiduk F. F. Komarov V. A. Pilipenko V. S. Solovygraveyev N. I. Sterzhanov 《辐射效应与固体损伤》2013,168(6):205-211
Structure and impurity behaviour of silicon doped by B+ ion implantation up to dose of 2 × 1015 ion/cm2 have been investigated after lamp pulse annealing. It has been demonstrated that the implanted layer structure strongly depends on the implantation dose, light energy density, as well as the crystallographic orientation. The optimal annealing result in the structure, which is equivalent to that obtained in the thermal treatment, The impurity diffusive redistribution proved to be rather weaker then in the case of thermal treatment. 相似文献
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E. P. Troitskaya Val. V. Chabanenko I. V. Zhikharev Ie. Ie. Gorbenko E. A. Pilipenko 《Physics of the Solid State》2012,54(6):1254-1262
The lattice dynamics of rare-gas crystals has been constructed taking into account the deformation of electron shells of the atoms of the dipole and quadrupole types, depending on the displacement of the nuclei. The obtained equations of lattice vibrations have been investigated in the long-wavelength approximation. The role played by the three-body interaction and the deformation of the electron shells in the violation of the Cauchy relation has been discussed. The calculated Birch elastic moduli for Xe and deviations from the Cauchy relation are in good agreement with the available experimental data over a wide range of pressures. 相似文献
70.
It is shown that the height of the barrier and its position, as well the depth of the capture well, are highly sensitive to
the relative orientation of colliding strongly deformed nuclei. It is found that the fusion/capture cross sections and the
nucleus-nucleus potential for heavy nuclear systems depend greatly on the magnitude and sign of the quadrupole deformation
of nuclear surfaces. In order to describe correctly the cross section for the capture of heavy strongly deformed nuclei, it
is necessary to perform averaging over all three angles that describe their relative orientation. Allowance for a hexadecapole
deformation leads to a significant increase in the capture cross section for very heavy nucleus-nucleus systems. 相似文献