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• W3207691279 abstract "The small-angle neutron scattering (SANS) on HeLa nuclei demonstrates the bifractal nature of the chromatin structural organization. The border line between two fractal structures is detected as a crossover point at Q_{c}≈4×10^{-2}nm^{-1} in the momentum transfer dependence Q^{-D}. The use of contrast variation (D_{2}O-H_{2}O) in SANS measurements reveals clear similarity in the large scale structural organizations of nucleic acids (NA) and proteins. Both NA and protein structures have a mass fractal arrangement with the fractal dimension of D≈2.5 at scales smaller than 150 nm down to 20 nm. Both NA and proteins show a logarithmic fractal behavior with D≈3 at scales larger than 150 nm up to 6000 nm. The combined analysis of the SANS and atomic force microscopy data allows one to conclude that chromatin and its constitutes (DNA and proteins) are characterized as soft, densely packed, logarithmic fractals on the large scale and as rigid, loosely packed, mass fractals on the smaller scale. The comparison of the partial cross sections from NA and proteins with one from chromatin as a whole demonstrates spatial correlation of two chromatin's components in the range up to 900 nm. Thus chromatin in HeLa nuclei is built as the unified structure of the NA and proteins entwined through each other. Correlation between two components is lost upon scale increases toward 6000 nm. The structural features at the large scale, probably, provide nuclei with the flexibility and chromatin-free space to build supercorrelations on the distance of 10^{3} nm resembling cycle cell activity, such as an appearance of nucleoli and a DNA replication." @default.
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• W3207691279 date "2021-10-07" @default.
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• W3207691279 title "Observation of nucleic acid and protein correlation in chromatin of HeLa nuclei using small-angle neutron scattering with <mml:math xmlns:mml=http://www.w3.org/1998/Math/MathML><mml:mrow><mml:msub><mml:mi mathvariant=normal>D</mml:mi><mml:mn>2</mml:mn></mml:msub><mml:mi mathvariant=normal>O</mml:mi><mml:mtext>−</mml:mtext><mml:msub><mml:mi mathvariant=normal>H</mml:mi><mml:mn>2</mml:mn></mml:msub><mml:mi mathvariant=normal>O</mml:mi></mml:mrow></mml:math> contrast variation" @default.
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• W3207691279 doi "https://doi.org/10.1103/physreve.104.044404" @default.
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