TEMPERATURE FEATURES OF HYSTERESIS PROPERTIES OF La-Co FILMS

Magnetic properties of La-Co films of different compositions are investigated experimen-tally within the temperature range of 5-350 K and interpreted with involvement of computer modeling. Exchange bias is detected, its presence is associated with amorphous-crystalline inhomogeneity of the films.This work was supported by the Russian Science Foundation, project № 18-72-10044

Microwave resistance of metal-dielectric film nanocomposites Co X(SiO2)1-X

Penetration and reflection of millimeter waveband electromagnetic waves have been studied for thin film metal-dielectric nanocomposite Co X(SiO2)1-X materials, in which cobalt nanoparticles are placed inside of 100nm thickness SiO2 film. Microwave properties of nanocomposite samples with different cobalt content have been measured. Measurements are carried out in frequency range from 26 to 38 GHz. The frequency dependencies of transmission and reflection coefficients are obtained. Share of power loss in the samples was calculated. The algorithm for conductivity reconstruction from the transmission coefficient frequency dependence was worked out. It was found that the microwave conductivity arises with increase of cobalt content and differs essentially from dc conductivity. © 2010 EuMA.European Microwave Association (EuMA);IEEE;MTT-S;Electron Devices Society (EDS);GAA

Millimeter wave resistance of metal-dielectric Cox(SiO2)1-x and Cox(Al2O3)1-x films

Transmission and reflection of millimeter waveband electromagnetic waves have been studied for thin-film metaldielectric Cox(SiO2 )1-x and Cox(Al2O3 )1-x nanocomposite materials, where cobalt nanoparticles are placed inside SiO2 or Al2O3 films of 100 nm thickness. Themicrowave properties of the nanocomposite samples with different cobalt content have been measured in the frequency ranges from 26 to 38 GHz and from 53 to 77 GHz. Frequency dependencies of transmission and reflection coefficients have been measured. Power loss in the samples has been determined. An algorithm for recovering the conductivity from the frequency dependencies of the transmission and reflection coefficients has been worked out. It has been found that the microwave conductivity increases with increasing cobalt content and differs drastically from the dc conductivity. The obtained results have been compared to the actual measurements of magnetic properties. © 2017 IEEE.Russian Foundation for Basic Research, RFBR: 16-32-00327 mol_a Russian Science Foundation, RSF: [email protected]

An inducible arylsulfatase of Volvox carteri with properties suitable for a reporter-gene system. Purification, characterization and molecular cloning

The multicellular green flagellate Volvox carteri synthesizes a periplasmic arylsulfatase in response to sulfur deprivation. The inducible enzyme has been purified to homogeneity and characterized. The corresponding gene and cDNA have been cloned. Determination of the sequence of genomic clones and comparisons to the cDNA sequence, revealed sixteen introns and seventeen exons that encode a 649-amino-acid polypeptide chain. Since the arylsulfatase enzyme is readily assayed using chromogenic substrates, but is not detectable in cells grown in sulfate-containing medium, the gene encoding arylsulfatase may be useful as a reporter gene in V. carteri. In addition, the highly regulated promoter of the arylsulfatase gene suggests its suitability as a tool for producing inducible expression vectors for cloned genes