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Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Baker, Syed, Prudnikova, Svetlana V., Shumilova, Anna A., Perianova, Olga V., Zharkov S. M., Kuzmin A.
Заглавие : Bio-functionalization of phytogenic Ag and ZnO nanobactericides onto cellulose films for bactericidal activity against multiple drug resistant pathogens
Место публикации : J. Microbiol. Methods. - 2019. - Vol. 159. - P.42-50. - ISSN 0167-7012, DOI 10.1016/j.mimet.2019.02.009. - ISSN 1872-8359(eISSN)
Примечания : Cited References: 59
Предметные рубрики: SILVER NANOPARTICLES
ANTIMICROBIAL ACTIVITY
SIZE
COMPOSITES
MEMBRANE
Аннотация: The present study describes the synthesis of silver and zinc oxide nanobactericides from the phytogenic source Bupleurum aureum The synthesized nanobactericides were characterized and evaluated for bio-functionalization onto bacterial cellulose membrane which was synthesized by Komagataeibactencylinus B-12068 culture strain. The synthesis of nanobacterides were initially confirmed using UV-Visible spectroscopy which indicated localized surface resonance (LSPR) peaks at 415 nm for silver nanobactericides and 280 nm for zinc nanobactericides. The nature of the capping agent for synthesized nanobactericides was predicted using FTIR which confirmed the presence of functional moieties. XRD analysis revealed their crystalline nature while morphological characteristics were studied using TEM which confirmed the polydispersity of nanobactericides with the average size in the range of 20-25 nm. The nanobactericides were tested for their antimicrobial activity against seven multi-drug resistant pathogens which were clinically isolated from patients suffering from a myriad of microbial infections. The tested pathogens had antimicrobial resistance to ten different antibiotics and have been reported to be the major cause of nosocomial infections. The nanobactericides displayed significant activity against the test pathogens. Silver nanobactericides showed the highest activity against Escherichia coli strain 55 with a 24 mm zone of inhibition while zinc oxide nanobactericides displayed the highest activity against methicillinresistant Staphylococcus aureus (MRSA) with a 20 mm inhibition zone. The bio- functionalized cellulose films (BCF) were characterized using SEM along with physicochemical analysis. The BCF's were evaluated for anti-bacterial activity against test pathogens which resulted in marked antimicrobial potential against multi-drug resistant bacteria and therefore has the potential to be utilized as an efficient alternative to counter drug resistant pathogens.
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Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Babkina I. V., Volochaev M. N., Zhilova O. V., Kalinin, Yu. E., Makagonov V. A., Pankov, S. Yu., Sitnikov A. V.
Заглавие : Electrical properties of thin In2O3/C films
Коллективы : Russian Federation Ministry of Science and Higher Education [3.1867, 2017/4.6]
Место публикации : Inorg. Mater. - 2020. - Vol. 56, Is. 4. - P.374-381. - ISSN 0020-1685, DOI 10.1134/S0020168520040019. - ISSN 1608-3172(eISSN)
Примечания : Cited References: 26. - This work was supported by the Russian Federation Ministry of Science and Higher Education (state research target, project no. 3.1867, 2017/4.6).
Предметные рубрики: SEMICONDUCTORS
GAS
Аннотация: We have studied the structure and electrical properties of thin films based on the In2O3 semiconductor and carbon, grown by atomic layer deposition using ion-beam sputtering. The structure of the resultant materials, formed during layer-by-layer growth of island layers, is made up of nanocrystalline In2O3 granules distributed at random over amorphous carbon. The electrical transport properties of the In2O3/C thin films depend on their thickness. In the temperature range 80-300 K, the dominant electrical transport mechanism in the In2O3/C thin films of thickness h 70 nm sequentially changes from variable range hopping between localized states in a narrow energy band near the Fermi level (between 80 and 120 K) to nearest neighbor hopping (between 120 and 250 K) and then to variable range hopping between localized states in the conduction band tail (between 250 and 300 K). The films of thickness h 70 nm undergo a change from conduction associated with strong carrier localization to that due to the presence of percolation clusters formed by In2O3 nanocrystals, which shows up as a linear temperature dependence of conductivity, with a negative temperature coefficient.
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Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Baker, Syed, Volova, Tatiana, Prudnikova, Svetlana V., Shumilova, Anna A., Perianova, Olga, V, Zharkov S. M., Kuzmin A. R., Kondratenka, Olga, Kiryukhin, Bogdan, Shidlovskiy, Ivan P., Potkina, Zoya K., Khohlova, Olga Y., Lobova, Tatiana I.
Заглавие : Bio-hybridization of nanobactericides with cellulose films for effective treatment against members of ESKAPE multi-drug-resistant pathogens
Коллективы : Ministry of Education and Science of the Russian Federation under the scheme of 5-100: Russian Academic Excellence Project
Место публикации : Appl. Nanosci. - 2018. - Vol. 8, Is. 5. - P.1101-1110. - ISSN 2190-5509, DOI 10.1007/s13204-018-0717-9. - ISSN 2190-5517(eISSN)
Примечания : Cited References: 51. - Authors are thankful for Ministry of Education and Science of the Russian Federation for providing funding under the scheme of 5-100: Russian Academic Excellence Project. Authors are grateful for facilities provided by Siberian Federal University to carry out the present study.
Предметные рубрики: SILVER NANOPARTICLES
BACTERIAL CELLULOSE
ANTIBIOTIC-RESISTANCE
Ключевые слова (''Своб.индексиров.''): eskape--bio-hybridization--silver nanobactericides--phytogenic--bactericidal activity
Аннотация: The rapid expansion of drug-resistant pathogens has created huge global impact and development of novel antimicrobial leads is one of the top priority studies in the current scenario. The present study aims to develop bio-hybridized nanocellulose films which comprise of phytogenic silver nanobactericides. The nanobactericides were synthesized by treating 1 mM silver nitrate with aqueous extract of Chamerion angustifolium which reduced the metal salt to produce polydispersed nanobactericides which were tested against the members of ESKAPE drug-resistant communities. The synthesized silver nanobactericides were subjected to characterization with UV–visible spectra which displayed maximum absorbance at 408 nm. The bio-molecular interaction of phyto-constituents to mediate synthesis and stabilization of nanobactericides was studied with Fourier-transform infrared spectroscopy (FTIR) which depicted functional groups associated with nanobactericides. The crystalline nature was studied with X-ray diffraction (XRD) which showed Bragg’s intensities at 2θ angle which denoted (111), (200), (220), and (311) planes. The morphological characteristics of silver nanobactericides were defined with transmission electron Microscopy (TEM) image which displayed polydispersity of silver nanobactericides with size ranging from 2 to 40 nm. The synthesized nanobactericides showed a significant activity against MRSA strain with 21 mm zone of inhibition. The minimal inhibitory concentration of silver nanobactericides to inhibit the growth of test pathogens was also determined which ranged between 0.625 and 1.25 μg/ml. The silver nanobactericides were bio-hybridized onto nanocellulose films produced by Komagataeibacter xylinus B-12068 culture strain. The films were dried to determine the mechanical properties which showed increased in Young’s modulus and tensile strength in comparison with control bacterial cellulose films. Overall, the results obtained in the present investigation are promising enough to report bactericidal activity of bio-hybridized nanobactericidal films against ESKAPE. These communities are reported to cause severe threats to all forms of lives irrespective to their habitats which can lead to huge economical crisis.
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Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Иваненко, Александр Анатольевич, Тамбасов, Игорь Анатольевич, Шестаков, Николай Петрович
Заглавие : Микроколориметр для измерения коэффициента излучения тонкопленочных высокоотражающих образцов при криогенных температурах
Место публикации : Космич. аппараты и технол. - 2018. - Т. 2, № 3. - С. 165-169. - ISSN 2618-7957, DOI 10.26732/2618-7957-2018-3-165-169
Примечания : Библиогр.: 9
Ключевые слова (''Своб.индексиров.''): коэффициент излучения--степень черноты--"черное тело"--термометр сопротивления--криогенные температуры--высокоотражающие покрытия--emissivity--blackness degree--"blackbody"--resistance thermometer--cryogenic temperatures--highly reflective coatings
Аннотация: Предложено решение проблемы измерения коэффициента излучения (степени черноты) тонкопленочных высокоотражающих образцов при криогенных и комнатных температурах. Для обеспечения необходимой точности и чувствительности создан тонкопленочный элемент, содержащий платиновый датчик температуры и нагреватель, а также пленка с высоким коэффициентом излучения - модель «черного тела». На базе этих элементов, криостата замкнутого цикла TM AC-V12a фирмы Cryomech (США) и крейтовой системы LTR-EU-8-1 сбора информации с модулями АЦП и ЦАП фирмы L-CARD (Россия) создана установка для измерения теплопередачи между пленочными покрытиями, осуществляемой за счет излучения. Раскрыты способы обработки результатов измерений, осуществляемой при оценке сопротивления платиновых датчиков температуры, которые позволяют производить измерение температуры со среднеквадратическим отклонением 0,001 К. Описаны базовые элементы установки. Описаны проводимые на установке измерения, необходимые для вычисления коэффициента излучения. Приведена методика расчета коэффициента излучения с использованием результатов измерений, проводимых с помощью микрокалориметра.A solution to the problem of measuring the emissivity (degree of blackness) of thin-film high-reflective samples at cryogenic and room temperatures is proposed. To ensure the required accuracy and sensitivity, a thin-film element containing a platinum temperature sensor and a heater, as well as a high emissivity film (a black body model) has been created. On the basis of these elements, the cryomech TM AC-V12a cryostat of the company Cryomech (USA) and the LTR-EU-8-1 crate of data collection with the ADC and DAC modules of the L-CARD company (Russia) created an installation for measuring heat transfer (carried out by radiation) between film coatings. Measurement processing methods that allow temperature measurement with a standard deviation of 0,001 K are presented. The basic installation elements are described. The measurements carried out at the facility, necessary for calculating the emissivity, are described. A method for calculating the emissivity using the results of measurements carried out using a micro calorimeter is presented.
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Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Sitnikov M. N., Kharkov A. M., Aplesnin S. S., Romanova O. B.
Заглавие : Influence of the Magnetic Field on Transprt Properties of Holmium-Manganese Sulfide
Место публикации : Sib. J. Sci. Technol. - 2020. - Vol. 21, Is. 3. - P.451-458. - ISSN 2587-6066, DOI 10.31772/2587-6066-2020-21-3-451-458; \b Сибирский журнал науки и технологий
Примечания : Cited References: 33. - The work was supported by the Siberian State University youth grant, SibGU, 2020
Аннотация: Holmium-manganese silfide with giant magnetoresistance refers to new magnetic sulfide compounds of holmium and manganese that have the effect of giant magnetoresistance (i. e., with special magnetoelectric properties), which can be used as components of sensor technology, magnetic memory, and spintronics. The technology of manufacturing polycrustals HoxMn1-xS grown by crystallization from the melt of the obtained powdered sulfides with a putity not lower then 99,9%, in glass-carbon crucibles and a quartz reactor in an argon atmosphere is presented. According to the results of x-ray diffracton analysis, HoxMn1-xS holmium-manganese sulfides have a HCC structure of the NaCl type. As the degree of cationic substitution increases, the unit cell parameter increases linearly with the concentration. No concomitant impurity phases are detected in the synthesized samples. Tj determine the state of the spin glass, mahnetic moment measurements are conducted at several frequencies ω = 1 KHz, 10 KHz and 100 kHz. The dependence of magnetic characteristics on the frequency of measurements is found. The damping of the magnetic moment and its increase with a decrease in temperature is reviled, which is connected with the formation of metastable states. Measurements of electrical resistance without a field and in a magnetic field are conducted. Anomalies in the remperature dependence of the conductivity are found. A change in the magnetoresistance sign is detected with the increase of temperature below and above room temperature.Гольмий-марганцевый сульфид с гигантским магнитосопротивлением относится к новым магнитным сульфидным соеднениям гольмия и марганца, обладающим эффектом гигантского магнитоспопротивления, то есть с особыми магнитоэлектрическими свойствами, которые могут быть использованы в качестве составляющих компонент сенсорной техники, магнитной памяти для спинтроники. Приведена технология изготовления поликристаллов HoxMn1-xS, выращенных кристаллизацией из расплава полученных порошковых сульфидов чистотой не ниже 99,9% в стеклоуглеродных тиглях и кварцевом реакторе в атмосфере аргона. Согласно результатам рентгеноструктурного анализа, гольмий-марганцевые сульфиды HoxMn1-xS имеют ГЦК структуру типа NACl. С увеличением степени катионного замещения параметр элементарной ячейки линейно увеличивается с концентрацией. Сопутствующих примесных фаз в синтезированных образцах не обнаружено. Для установления состояния спинового стекла проуедены измерения магнитного момента на нескольких частотах ω = 1, 10 и 100 KHz. Обнаружена зависимость характеристик от частоты измерений. Найдено затухание магнитного момента и его увеличение с понижением температуры, что связывается с образованием метастабильных состояний. Проведены измерения электросопротивления без поля и в магнитном поле. Найдены аномалии в температурной зависимости проводимости. Обнаружена смена знака магнитосопротивления с ростом температуры ниже и выше комнатной температуры.
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Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Pavlov A. V., Kveglis L. I., Saprykin D. N., Nasibullin R. T., Kalitova A. A., Velikanov D. A., Nemtsev I. V., Kantai N.
Заглавие : Emergence of ferromagnetism in nanoparticles of BeTiO3 ceramic with the perovskite structure
Место публикации : Inorg. Mater.: Appl. Res. - 2021. - Vol. 12, Is. 1. - P.88-93. - ISSN 20751133 (ISSN), DOI 10.1134/S2075113321010330
Примечания : Cited References: 21. - The part of the work involving calculations was supported by the Russian Science Foundation (grant no. 18-19-00268)
Аннотация: Emergence of ferromagnetism and an increase in the electrical conductance of BeTiO3 beryllium ceramic with the perovskite structure were discovered experimentally. To explain the reason for appearance of the metallic properties, models are proposed, and calculations of the electronic structure of nanoclusters with different short-range order are performed.
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Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Zhou J., Chen Y., Jiang C., Milicevic B., Molokeev M. S., Brik M. G., Bobrikov I. A., Yan J., Li J., Wu M.
Заглавие : High moisture resistance of an efficient Mn4+-activated red phosphor Cs2NbOF5:Mn4+ for WLEDs
Место публикации : Chem. Eng. J. - 2021. - Vol. 405. - Ст.126678. - ISSN 13858947 (ISSN), DOI 10.1016/j.cej.2020.126678
Примечания : Cited References: 43. - This work was financially supported by grants from the National Natural Science Foundation of China (No. 51802359, 21801254, 51902354) and its Joint Funds of Yunnan and Guangdong Province (No. U1702254 and No. U1801253), Special Fund of Guangdong Province Project for Applied Science and Technology Research and Development (No. 2017B090917001), Guangdong Basic and Applied Basic Research Foundation (No. 2020A1515010556), the Fundamental Research Funds for the Central Universities (No. 19lgpy123), and China Postdoctoral Science Foundation (No. 2019M663230). M. G. Brik thanks the supports from the National Recruitment Program of High-end Foreign Experts (No. GDT20185200479 and GDW20145200225), the Programme for the Foreign Experts (No. W2017011) and Wenfeng High-end Talents Project (No. W2016-01) offered by Chongqing University of Posts and Telecommunications (CQUPT) , Estonian Research Council grant PUT PRG111, and European Regional Development Fund (TK141)
Аннотация: Mn4+-activated fluoride red phosphors, the most important red phosphors for warm white light emitting diodes (LEDs), usually suffer from inherent poor moisture resistance which is a major obstacle to their long-lasting outdoor applications in a high humidity environment. Surface modification of phosphors by coating with either organic or inorganic shells is an effective way to improve waterproof stability. However, the coating procedure usually has a negative impact on the luminous efficacy due to the increased passivation shell thickness. In this work, Mn4+-activated oxyfluoroniobate (Cs2NbOF5), a highly efficient phosphor with internal quantum efficiency of ca. 82%, has been successfully synthesized and it is interesting to note that Cs2NbOF5:Mn4+ can exhibit remarkably improved waterproof stability even without surface coating compared to well-accepted commercial fluoride red-emitting phosphor, K2SiF6:Mn4+. The results obtained indicate that Nb5+ ions inside red phosphor play a crucial role in improving the water-resistant performance of Mn4+, which provides a new concept for overcoming the downside of their waterproof in humid conditions and maintaining the luminescence efficiency. In the final phase white LEDs with a high luminous efficacy of 174 lm/W (higher than commercial fluoride red phosphors), low correlated color temperature (3164 K) and high color rendering index (Ra = 90 and R9 = 85) have been fabricated using Cs2NbOF5:Mn4+.
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Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Drokin N. A., Kiiko V. S., Pavlov A. V., Malkin A. I.
Заглавие : BT-30 Ceramic Electrophysical Properties
Место публикации : Refract. Ind. Ceram. - 2020. - Vol. 61, Is. 3. - P.341-348. - ISSN 1083-4877 (ISSN), DOI 10.1007/s11148-020-00484-2. - ISSN 1573-9139 (eISSN)
Примечания : Cited References: 12
Аннотация: A total complex resistance (impedance) method is used to study the electrophysical characteristics of (BeO + TiO2)-ceramics modified with TiO2 micro- and nanoparticles in an amount of 30 wt.% (BT-30). Dispersion of the actual ε′ and imaginary ε′′ components of the dielectric permittivity component and specific conductivity in the frequency range from 100 Hz to 100 MHz from room temperature to the boiling point of liquid nitrogen are determined. High values of ε′ and ε′′ in the low-frequency range are typical for structurally inhomogeneous materials due to the accumulation of electric charges at the surface and within microcrystals. Two dielectric relaxation processes associated with electrical conductivity within the body and at the surface of ceramics are detected for the first time. An increase in conductivity with an increase in the microwave field frequency above 1 MHz is explained by the appearance of a current relaxation component. The activation energy of the static resistance of ceramic specimens is determined as a function of the reciprocal temperature that depends little on the weight content of TiO2 nanoparticles and varies in the range of 0.024 – 0.10 eV This also confirms the existence of two independent conduction processes, weakly dependent on the nanoparticle content in the ceramic composition. With placement of ceramic in a high-frequency electric field, spatial charges are formed, the field of which contributes to creation of additional polarization and dielectric losses.
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Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Balaev D. A., Dubrovskii A. A., Shaikhutdinov K. A., Popkov S. I., Gokhfeld D. M., Gokhfeld Yu. S., Petrov M. I.
Заглавие : Mechanism of the hysteretic behavior of the magnetoresistance of granular HTSCs: The universal nature of the width of the magnetoresistance hysteresis loop
Коллективы : Quantum Macrophysics of the Russian Academy of Sciences [3.4]; Krasnoyarsk Regional Science Foundation [18G011]; Foundation for Supporting National Science Projects
Место публикации : J. Exp. Theor. Phys.: MAIK NAUKA/INTERPERIODICA/SPRINGER, 2009. - Vol. 108, Is. 2. - P241-248. - ISSN 1063-7761, DOI 10.1134/S106377610902006X
Примечания : Cited References: 32. - This study was carried out under the program "Quantum Macrophysics" of the Russian Academy of Sciences and complex integration project no. 3.4 of the Siberian Branch of the Russian Academy of Sciences, and was partly supported by the Krasnoyarsk Regional Science Foundation (grant no. 18G011). D. A. B. and A. A. D. are grateful to the Foundation for Supporting National Science Projects.
Предметные рубрики: CRITICAL-CURRENT-DENSITY
HIGH-TEMPERATURE SUPERCONDUCTOR
CURRENT-VOLTAGE CHARACTERISTICS
EXTERNAL MAGNETIC-FIELD
BA-CU-O
JOSEPHSON MEDIUM
CRITICAL-STATE
FLUX
COMPOSITES
YBA2CU3O7-DELTA
Ключевые слова (''Своб.индексиров.''): barium--calcium--damping--electric resistance--high temperature superconductors--magnetic field effects--magnetic materials--magnetoelectronics--magnetoresistance--stiffness--classical systems--critical densities--experimental datum--external conditions--flux trapping--hysteretic behaviors--josephson vortices--residual resistances--transport currents--universal behaviors--y-ba-cu-o--hysteresis
Аннотация: The hysteretic behavior of the magnetoresistance R(H) of granular high-temperature superconductors (HTSCs) of the Y-Ba-Cu-O, Bi-Ca-Sr-Cu-O, and La-Sr-Cu-O classical systems is investigated for transport current densities lower and higher than the critical density (at H = 0). All systems exhibit universal behavior of the width of the magnetoresistance hysteresis loop: independence of transport current under identical external conditions. This means that flux trapping in HTSC grains is the main mechanism controlling the hysteretic behavior of the magnetoresistance of granular HTSCs, while pinning of Josephson vortices in the intragranular medium makes no appreciable contribution to the formation of magnetoresistance hysteresis (when transport current flows through the sample). Experimental data on relaxation of residual resistance after the action of a magnetic field also confirm this conclusion.
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10.

Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Pynko V. G., Kiselev N. I.
Заглавие : Ferromagnetic magnetic resistance and energetic crystallographic anisotropy
Место публикации : Pisma Zhurnal Tek. Fiz. - 1989. - Vol. 15, Is. 1. - P.44-47. - ISSN 0320-0116
Примечания : Cited References: 4
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