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Microwave Radiation Effects on the Process of Escherichia coli Cultivation
( Denis Kuznetsov ),( Igor Volkhin ),( Ekaterina Orlova ),( Valery Neschislyaev ),( Alevtina Balandina ),( Anna Shirokikh ) 한국미생물생명공학회(구 한국산업미생물학회) 2019 한국미생물·생명공학회지 Vol.47 No.3
Modern biotechnological industries have been attempting to improve the efficiency of bacterial strain cultivation. Millimeter wave electromagnetic radiation can have a varied influence on E. coli cultivation processes. The results of the study revealed that when a microwave radiation of low intensity is applied to positively adjust the conditions for the accumulation of bacterial culture biomass, a significant role is played not only by radiation parameters, but also by concomitant biological factors, which influence the reproducibility of the cultivation process and help obtain a useful biotechnological effect. The authors suggest a model that can be used to study the molecular mechanisms underlying the changes in the buildup of E. coli biomass under the influence of electromagnetic radiation.
Microwave Radiation Effects on the Process of Escherichia coli Cultivation
Kuznetsov, Denis,Volkhin, Igor,Orlova, Ekaterina,Neschislyaev, Valery,Balandina, Alevtina,Shirokikh, Anna The Korean Society for Microbiology and Biotechnol 2019 한국미생물·생명공학회지 Vol.47 No.3
Modern biotechnological industries have been attempting to improve the efficiency of bacterial strain cultivation. Millimeter wave electromagnetic radiation can have a varied influence on E. coli cultivation processes. The results of the study revealed that when a microwave radiation of low intensity is applied to positively adjust the conditions for the accumulation of bacterial culture biomass, a significant role is played not only by radiation parameters, but also by concomitant biological factors, which influence the reproducibility of the cultivation process and help obtain a useful biotechnological effect. The authors suggest a model that can be used to study the molecular mechanisms underlying the changes in the buildup of E. coli biomass under the influence of electromagnetic radiation.
Choi, Hyun Ho,Najafov, Hikmet,Kharlamov, Nikolai,Kuznetsov, Denis V.,Didenko, Sergei I.,Cho, Kilwon,Briseno, Alejandro L.,Podzorov, Vitaly American Chemical Society 2017 ACS APPLIED MATERIALS & INTERFACES Vol.9 No.39
<P>Photoinduced charge transfer between semiconductors and gate dielectrics can occur in organic field-effect transistors (OFETs) operating under illumination, leading to a pronounced bias-stress effect in devices that are normally stable while operating in the dark. Here, we report an observation of a'polarization-dependent photoinduced bias-stress effect in two' prototypical single-crystal OFETs, based on rubrene and tetraphenylbis(indolo{l,2-alpha})quinolin. We find that the decay rate of the source-drain current in these OFETs under, illumination is a periodic function of the polarization angle of incident photoexcitation with respect to the crystal axes, with a periodicity of n. The angular positions of maxima and minima of the bias-stress rate match those of the optical absorption coefficient of the corresponding crystals. The analysis of the effect shows that it stems from a charge transfer of 'hot' holes, photogenerated in the crystal within a very short thermafization length (MLT mu m) from the semiconductor-dielectric interface. The observed phenomenon is a type of intrinsic structure-property relationship, revealing how molecular packing affects parameter drift in organic transistors under illumination. We also demonstrate that a photoinduced charge transfer in OFETs can be used for recording rewritable accumulation channels with an optically defined geometry and resolution, which can be used in a number of potential applications.</P>
Nguyen Van Minh,Yury Konyukhov,Gopalu Karunakaran,Dmitry Ryzhonkov,Tang Duong,Sergey Kotov,Denis Kuznetsov 대한금속·재료학회 2017 METALS AND MATERIALS International Vol.23 No.3
In the present study, the influence of nano additives (Ni, Fe) and different mixing (turbular and magnetic) on thedensification, microstructure and micro-hardness of the tungsten material under spark plasma sintering is analyzed. After turbulent mixing the nanoparticles are distributed widely in the W interparticle gaps but after magneticmixing the nanoparticles are distributed not only on the gaps of the W particles but also on the broken surfaces. Niincorporated tungsten materials achieved the maximum density of 98.3% at 1400 °C (turbular mixing) and 97.9%at 1300 °C (magnetic mixing). Fe incorporated tungsten material showed density of 97.7% at 1600 °C and 97.2%at 1400 °C after turbular and magnetic mixing. The influence of nanoparticles in the densification process wasexplained by Laplace force, boundary slip and Agte-Vacek effect. The microstructural analysis showed that nanomodificationreduced the degree of porosity, and provides a compact material at low temperatures. X-ray fluorescenceanalysis reveals that magnetic mixing shows more uniform distribution of nanoparticles than turbular mixing. Thenanoparticles incorporation increased the micro hardness of tungsten material. Hence, it is clear that magnetic mixingand nano modification greatly improved the densification and sintering behavior of the tungsten material.
Manab Kundu,Gopalu Karunakaran,Evgeny Kolesnikov,Voynova Elena Sergeevna,Shilpa Kumari,Mikhail V. Gorshenkov,Denis Kuznetsov 한국공업화학회 2018 Journal of Industrial and Engineering Chemistry Vol.59 No.-
The hollow NiCo2O4 nano-spheres (∼300–500 nm) are synthesized by ultrasonic spray pyrolysis method and used as electrode for high-performance supercapacitor (SC) and lithium-ion battery (LIB). When used in SC application, the hollow NiCo2O4 deliver a specific capacitance of ∼1000 F g−1 even after 3000 charge–discharge cycles. In addition, as an anode material for LIBs, it exhibits admirable high capacity values of 763 and 516 mA h g−1 after 1000 cycles at a current density of 1500 and 3000 mAh g−1, respectively. The excellent electrochemical performance of this hollow NiCo2O4 nano-sphere indicates its potential applications for next generation SCs and LIBs.