Biophysics

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Apoptotic nature of erythrocyte hemolysis induced by low doses of ionizing radiation
Biophysics - Tập 60 - Trang 79-84 - 2015
V. N. Krylov, A. V. Deriugina, S. N. Pleskova, V. A. Kalinin
It is shown that exposure of rat erythrocytes to low doses of ionizing radiation (0.04, 0.08, 0.16, 0.25, and 0.33 mGy) leads to nonlinear changes in lipid peroxidation processes in the membrane of erythrocytes, their electrophoretic mobility, and osmotic resistance. Ionizing radiation in the dose range from 0.08 to 0.16 mGy apparently triggers apoptosis, leading to deceleration of hemolysis and s... hiện toàn bộ
Can local energy minimization refine the PDB structures of different resolution universally?
Biophysics - - 2009
M. G. Godsie, A. P. Gromova, I. V. Oferkin, P. V. Mironov
Local energy minimization was statistically tested as the refinement strategy for PDB structure pairs of different resolution. The 13 pairs of structures with the only difference being the resolution were extracted from PDB and represented structures of 11 identical proteins obtained with different x-ray diffraction techniques. The rmsd distribution was calculated for these pairs before and after ... hiện toàn bộ
The Effect of an Electrochemically Activated Water Solution on Plant Polysaccharides: Phenomenology and Spectrometry
Biophysics - - 2024
A. G. Pogorelov, L. G. Ipatova, A. I. Panait, M. A. Pogorelova, A. A. Gulin, V. N. Pogorelova
Changes in the properties of polysaccharides in an electrochemically activated aqueous solution have been studied using UV-Vis spectrometry, time-of-flight secondary ion mass spectrometry and scanning electron microscopy. It is shown that the studied solutions of polysaccharides of plant origin (agar, soluble starch, and food starch) are subject to modification, the direction of which is determine... hiện toàn bộ
Hydrogen peroxide in artificial photosynthesizing systems
Biophysics - Tập 59 - Trang 169-182 - 2014
A. V. Lobanov, G. G. Komissarov
From the point of view of the concepts of hydrogen peroxide as a source of photosynthetic oxygen (hydrogen) coordination and photochemical properties of chlorophyll and its aggregates towards hydrogen peroxide were considered. The binding energy of H2O and H2O2 with chlorophyll and chlorophyllide depending on their form (monomers, dimers and trimers) was estimated by quantum chemical calculations.... hiện toàn bộ
Long-period endogenous oscillations in fish population size: Mathematical modeling
Biophysics - Tập 58 - Trang 245-257 - 2013
A. E. Bobyrev, V. A. Burmensky, E. A. Kriksunov, A. B. Medvinsky, N. I. Nurieva, A. V. Rusakov
We present a mathematical model of an aquatic community, where the size-and-age structure of hydrobiont populations is taken into account and the corresponding trophic interactions between zooplankton, peaceful fish, and predatory fish are described. We show that interactions between separate components of the aquatic community can give rise to long-period oscillations in fish population size. The... hiện toàn bộ
Oxygen effect in heat-induced DNA damage
Biophysics - Tập 52 - Trang 185-190 - 2007
A. V. Chernikov, S. V. Gudkov, I. N. Shtarkman, V. I. Bruskov
The major kinds of heat-induced damage to DNA (depurination, guanine oxidation to 8-oxoguanine, cytosine deamination to uracil) were shown to depend in their extent on the oxygen content in solution. Formation of hydrogen peroxide in water upon heating was enhanced in the presence of D2O and decreased by various scavengers of singlet oxygen, corroborating the involvement of 1O2 in the thermal gene... hiện toàn bộ
Searching for Sequencing Signal Anomalies Associated with Genomic Structural Variations
Biophysics - - 2024
I. V. Bezdvornykh, N. A. Cherkasov, A. A. Kanapin, A. A. Samsonova
Genomic structural variations (SVs) are among the main sources of genetic diversity. Structural variants as mutagens may significantly affect human health, causing hereditary diseases and cancers. Existing methods analyze high-throughput sequencing data to find structural variants. Despite substantial progress in their development, the methods still fail to detect structural variations with an acc... hiện toàn bộ
Electrostatic Interaction of Globins with Phospholipid Membranes
Biophysics - Tập 65 - Trang 913-919 - 2021
G. B. Postnikova, E. A. Shekhovtsova, V. S. Sivozhelezov
For the structures of sperm whale myoglobin (swMb), horse heart myoglobin (hhMb), hemoglobin I (HbI) from botfly Gasterophilus intestinalis (giHbI), and monomeric and dimeric hemoglobins HbI and HbII from Lucina pectinata mollusk (lpHbI and lpHbII), roles of electrostatic interactions in stabilization of native conformations of the heme cavity were analyzed, as well as their possible destabilizati... hiện toàn bộ
Description of chitosan binding to DNA at varied ionic strength within the framework of ion condensation and adsorption theories
Biophysics - Tập 52 - Trang 383-388 - 2007
E. A. Vorob’ev, Yu. D. Nechipurenko, V. I. Salyanov, Yu. M. Evdokimov
Chitosan binding to DNA was studied in solutions of different ionic strength. Data were analyzed within the model of ion condensation and the thermodynamic theory of extended ligand binding to DNA. The combination of these approaches allowed us to assess the sterical and energy characteristics of chitosan binding to DNA and to find the dependence of chitosan binding constant on solution ionic stre... hiện toàn bộ
Wavelet analysis of nonstationary heart rate variability in a head-up tilt-table test
Biophysics - Tập 57 - Trang 530-543 - 2012
S. V. Bozhokin, E. M. Lesova, V. O. Samoilov, P. I. Tolkachev
Heart rate variability during the head-up tilt test (HUT) was investigated using an automated setup of dynamic positioning in the gravity field. The wavelet theory was applied to find the dynamics of changes in the spectral properties of rhythmograms during the transitional steps of HUT. Quantitative parameters (spectral integrals, instantaneous maximal frequencies, nonstationarity factors) that d... hiện toàn bộ
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