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Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Gurevich Y. L., Mankov Yu.I., Khlebopros R. G.
Заглавие : Self-assembly of superparamagnetic ferrihydrite nanoparticles
Коллективы : Russian Foundation for Basic Research [08-08-00427_a, 10-08-00278_a]; Siberian Branch, Russian Academy of Sciences, Integration project [21]
Место публикации : Dokl. Phys.: MAIK NAUKA/INTERPERIODICA/SPRINGER, 2013. - Vol. 58, Is. 11. - P.478-481. - ISSN 1028-3358, DOI 10.1134/S1028335813110104
Примечания : Cited References: 15. - This work was supported by the Russian Foundation for Basic Research, project nos. 08-08-00427_a and 10-08-00278_a, and by the Siberian Branch, Russian Academy of Sciences, Integration project no. 21.
Предметные рубрики: CHAINS
CLUSTERS
Аннотация: A study was conducted to estimate the possibility of formation of chains of superparamagnetic nanoparticles of iron oxyhydroxides synthesized in a bacteria culture. The self-assembly of biogenic nanoparticles distinguished by low values of magnetization and small sizes is assumed to proceed due to the forces of magnetic dipole dipole interaction as an initial mechanism of aggregation and exchange-interaction forces, which provide the stability of chains. The microphotographs demonstrate the self-assembly of anisotropic cobalt-doped ferrihydrite nanoparticles in aggregates of ellipsoidal shape with sizes of about 550 × 300 nm and a platelike shape of 50-100 nm thick. The aggregates, in turn, are combined from blocks, which include a restricted number of nanoparticles of about 5 nm in diameter and have the shape of rods of 50-100 × 12 nm in size. The energy of degaussing fields of chains is reasonably high, which forces them to form two and three dimensional structures in which the compensation of such fields is provided.
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Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Teremova M. I., Petrakovskaya E. A., Romanchenko A. S., Tuzikov F. V., Gurevich Y. L., Tsibina O. V., Yakubailik E. K., Abhilash
Заглавие : Ferritization of industrial waste water and microbial synthesis of iron-based magnetic nanomaterials from sediments
Коллективы : RFFI [10-08-01278]; DST-RFBR Indo-Russian Long term Collaborative Project [DST-ILTP-A.2.61]
Место публикации : Environ. Prog. Sustain. Energy: Wiley-Blackwell, 2016. - Vol. 35, Is. 5. - P.1407-1414. - ISSN 1944-7442, DOI 10.1002/ep.12368. - ISSN 1944-7450(eISSN)
Примечания : Cited References:26. - The work has been carried out with support of grant of RFFI No 10-08-01278 and DST-ILTP-A.2.61 under DST-RFBR Indo-Russian Long term Collaborative Project. Authors are grateful to P.P. Pustoshilov, N.M. Kuchin, O.A. Bayukov, A.P. Puzyr and Lobova T.I. for assistance in experiment performance and valuable remarks.
Предметные рубрики: ACIDITHIOBACILLUS FERROOXIDANS CELLS
POT MULTICOMPONENT SYNTHESIS
Ключевые слова (''Своб.индексиров.''): industrial wastes--ferritization--bacteria--magnetic--ferrihydrite--nanoparticles
Аннотация: The precipitation of iron and associated heavy metals in industrial waste water and in model solution using ferritization and aerobic bacterial culture was investigated. Magnetic sediments extractable by magnetic separation (specific saturation magnetization of 16–36.8 G cm3/g) were produced by precipitation of iron by ferritization method at рН (8–10) and 60–80°С for 15–30 min. Nanoparticles of ferrihydrite or ferric hydroxide doped with associated metals (Co, Ni) were produced under precipitation of ferric iron in model solution with bacteria at the temperature 26–34°С. The radii of synthesized particles are 1–5 nm and nanoparticles of ferrihydrite are superparamagnetic in both un-doped and doped (Co, Ni, Zn) sets. Dispersed structure of biogenic nanoparticle sols, their magnetic and other properties were studied by atomic force microscopy, X-ray small-angle scattering, X-ray diffraction, electron magnetic resonance, Mössbauer and X-ray photoelectron spectroscopy.
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Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Bopp V. L., Mistratova N. A., Petrakovskaya E. A., Gurevich Y. L., Teremova M. I., Khlebopros R. G.
Заглавие : The influence of nanoparticles of biogenic ferrihydrite on the rooting of lignified cuttings of the Ledebour willow
Место публикации : Biophysics. - 2018. - Vol. 63, Is. 4. - P.621-628. - ISSN 00063509 (ISSN), DOI 10.1134/S0006350918040036
Примечания : Cited References: 38. - This study was supported by the Russian Foundation for Basic Research, the Government of the Kras-noyarsk krai, and the Krasnoyarsk regional foundation for support of scientific and technical activities under the research project no. 16-48-242158.
Аннотация: The influence of nanoparticles of biogenic ferrihydrite on the root formation of lignified cuttings of the Ledebour willow (Salix ledebouriana Trautv.) was investigated. The rooting of stem cuttings was performed in water using a phytohormone (indoyl-3-acetic acid) and nanoparticles. In comparison with the variants of incubation of cuttings in water and in a solution containing indolyl-3-acetic acid, the number and total length of the adventitious roots after 5 and 15 days of rooting were greatest in the cuttings treated with nanoparticles. In the early period of root development, increased levels of free radicals and intensities of the hyperfine structure lines of Mn2+ cleavage were recorded in the EPR spectra of plant tissues (lenticels of cuttings of treated with nanoparticles). The latter is related to the activity of manganese-containing superoxide dismutase. The response of cuttings to the treatment with nanoparticles was recorded by EPR before manifestation of adventitious root primordium initiation and development.
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Вид документа : Статья из сборника (выпуск монографической серии)
Шифр издания :
Автор(ы) : Bukhanov E. R., Gurevich Y. L., Shabanova K. A.
Заглавие : A study of wheat wax optical properties
Коллективы : Photonics and Electromagnetics Research Symposium - Fall
Место публикации : Photonics and Electromagnetics Research Symposium - Fall (2019 ; Dec 17-20 ; Xiamen, China). Photonics & Electromagnetics Research Symposium - Fall (PIERS - Fall): IEEE, 2019. - P.2890-2897. - (Progress in Electromagnetics Research Symposium). - , DOI 10.1109/PIERS-Fall48861.2019.9021781
Примечания : Cited References: 36
Предметные рубрики: DIMENSIONAL PHOTONIC CRYSTALS
BLUE-GREEN FLUORESCENCE
Аннотация: Epicuticular waxes are a multifunctional interface between a plant and the environment. In this paper wheat leaves wax has been studied. Wax isolation was carried out using the method of gradual freezing in water followed by slow thawing. The morphology of the samples obtained was observed with a Hitachi SU3500 electron microscope. The structure period is determined by the nanotubes diameter which equals 150-200 nm. Random orientation of their long axes in the layer allows using a one-dimensional model to calculate the transmission spectrum of a photonic crystal with the help of the transfer matrix method. While making the calculations a defect that may be caused by possible interlayer heterogeneity also must be taken into account. Numerical modeling made it possible to identify the stop zone and the defective mode. Intense fluorescence appears in the optical area of the wax layer under ultraviolet radiation, thus increasing the efficiency of photosynthesis.
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