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91.
V. A. Terekhov V. M. Kashkarov S. Yu. Turishchev K. N. Pankov V. A. Volodin M. D. Efremov D. V. Marin A. G. Cherkov S. V. Goryainov A. I. Korchagin V. V. Cherepkov A. V. Lavrukhin S. N. Fadeev R. A. Salimov S. P. Bardakhanov 《Bulletin of the Russian Academy of Sciences: Physics》2008,72(4):500-503
The nanopowders obtained by sputtering of silicon with a high-power electron beam in nitrogen and argon atmospheres have been investigated by transmission electron microscopy, Raman spectroscopy, photoluminescence spectroscopy, ultrasoft X-ray emission spectroscopy, and X-ray absorption near-edge structure spectroscopy. The sizes of particles and their phase composition have been determined. A mechanism is proposed, which explains the visible photoluminescence of nanopowders. 相似文献
92.
The objective of the present study was to describe more precisely experimental data on elastic scattering in the 16O + 16O system at E lab = 124, 145, 250, 350, and 480 MeV and in the 16O + 12C system at E lab = 132, 170, 181, 200, 230, 260, and 281 MeV. The role of exchange interaction in the region of backward angles is investigated. The coefficient of incompressibility of nuclear matter is estimated at K = 205 MeV ± 15%. 相似文献
93.
94.
G. N. Fadeev V. I. Ermolaeva V. S. Boldyrev V. V. Sinkevich 《Russian Journal of Physical Chemistry A, Focus on Chemistry》2016,90(9):1724-1728
Experimental results on the destabilization kinetics of compounds with chelate structure (polyvinylpyrrolidone-iodine) in the field of the impact of low-frequency vibrations (from 2 to 45 Hz) are presented. The optimum frequencies at which the process rate is greatest are found for different impact modes. Based on the experimental data, conclusions are drawn as to the effect the energy of low-frequency impacts has on the studied clathrate and chelate structures. 相似文献
95.
96.
S. Ya. Dzhasim N. Ya. Serov V. V. Fadeev A. M. Chekalyuk 《Journal of Applied Spectroscopy》1992,56(2):165-170
Translated from Zhurnal Prikladnoi Spektroskopii, Vol. 56, No. 2, pp. 252–258, February, 1992. 相似文献
97.
98.
N. V. Petrovskaya A. K. Fadeev V. I. Yudovich 《Journal of Applied Mechanics and Technical Physics》1991,32(1):31-35
Translated from Zhurnal Prikladnoi Mekhaniki i Tekhnicheskoi Fiziki, No. 1, pp. 35–39, January–February, 1991. 相似文献
99.
Helmy R Kazakevich Y Ni C Fadeev AY 《Journal of the American Chemical Society》2005,127(36):12446-12447
We report an investigation of the water-hydrophobic interface in well-defined nanochannels (R approximately 2-4 nm). Wetting in these systems cannot be described by classical (macroscopic) capillary theory: (1) water occupies only a fraction ( approximately 60%) of the pore volume, and (2) the capillary pressures are approximately 60-90% greater than predicted by the Laplace equation. The results suggest the presence of approximately 0.6 nm layer of low-density fluid (vapor) separating water from the hydrophobic solid. 相似文献
100.
Acinetobacter haemolyticus is an antibiotic resistant, pathogenic bacterium responsible for an increasing number of hospital infections. Acinetoferrin (Af), the amphiphilic siderophore isolated from this organism, contains two unusual trans-2-octenoyl hydrocarbon chains reminiscent of a phospholipid structural motif. Here, we have investigated the membrane affinity of Af and its iron complex, Fe-Af, using small and large unilamellar phospholipid vesicles (SUV and LUV) as model membranes. Af shows a high membrane affinity with a partition coefficient, K(x)= 6.8 x 10(5). Membrane partitioning and trans-membrane flip-flop of Fe-Af have also been studied via fluorescence quenching of specifically labeled vesicle leaflets and (1)H NMR line-broadening techniques. Fe-Af is found to rapidly redistribute between lipid and aqueous phases with dissociation/partitioning rates of k(off) = 29 s(-1) and k(on) = 2.4 x 10(4) M(-1) s(-1), respectively. Upon binding iron, the membrane affinity of Af is reduced 30-fold to K'(x) = 2.2 x 10(4) for Fe-Af. In addition, trans-membrane flip-flop of Fe-Af occurs with a rate constant, k(p) = 1.2 x 10(-3) s(-1), with egg-PC LUV and a half-life time around 10 min with DMPC SUV. These properties are due to the phospholipid-like conformation of Af and the more extended conformation of Fe-Af that is enforced by iron binding. Remarkable similarities and differences between Af and another amphiphilic siderophore, marinobactin E, are discussed. The potential biological implications of Af and Fe-Af are also addressed. Our approaches using inner- and outer-leaflet-labeled fluorescent vesicles and (1)H NMR line-broadening techniques to discern Af-mediated membrane partitioning and trans-membrane diffusion are amenable to similar studies for other paramagnetic amphiphiles. 相似文献