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Se Hoon Ki Somin Sin Jae-Ho Shin Young Wan Kwon Myoung Won Chae Han Sup Uhm Ku Youn Baik Eun Ha Choi 《Plasma Chemistry and Plasma Processing》2018,38(5):937-952
The studies with proteins are necessary to understand the biological effects of atmospheric pressure plasma (APP). Among proteins, those with transient metal ions play key roles in many biological events and they are very sensitive to environmental redox states. Iron-containing hemoglobin (Hb) is investigated in this study, after APP treatments under two environmental gas conditions of pure N2 and N2?+?O2 mixture. Monitoring the intensity change for absorption spectra could lead to a quantitative assessment of the effect of discharge plasma on Hb. Redox states of Hb are classified into five states including O2-bound Hb (oxy-Hb), deoxy-Hb, met-Hb, NO-bound Hb (NO-Hb), and hemichrome. Chemically generated reactive species and some scavengers are applied to understand the chemical reactions. Our experimental results confirm the complex chemical reactions of APP and suggest the possible use of Hb as a model protein for the visualization of APP biological effects. 相似文献
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Synthesis and characterization of monodisperse magnetic composite particles for magnetorheological fluid materials 总被引:2,自引:0,他引:2
Jung-Bae Jun Seong-Yong Uhm Jee-Hyun Ryu Kyung-Do Suh 《Colloids and surfaces. A, Physicochemical and engineering aspects》2005,260(1-3):157-164
Monodisperse magnetic composite particles (MCP) were prepared and characterized for a study of magnetic field-responsive fluids. Magnetic composite particles used are iron oxide-coated polymer composite particles, which were synthesized through in situ coating of iron oxide onto pre-existing polymer particles by the reduction of ferrous fluids. For a uniform and bulk coating of iron oxide, the porous structure was introduced into the substrate polymer particles through a two-step seeded polymerization method. Moreover, surface cyano-functionality was born from acrylonitrile unit of substrate polymer and it played an important role in obtaining successful uniform coating. The structure of the composite particle was analyzed by using a thermo gravimetric analysis (TGA) and a X-ray diffraction (XRD) analysis. The magnetization property of the particle was also observed. Then, the rheological properties of monodisperse magnetorheological (MR) suspensions of magnetic composite particles were examined under a magnetic field using a parallel-plate type commercial rheometer. From the rheological measurements, it was found that MR properties of the magnetic composite suspensions are dependent on the iron oxide content and the fluid composition. 相似文献
5.
Kim SH Kim JH Kang BK Uhm HS 《Langmuir : the ACS journal of surfaces and colloids》2005,21(26):12213-12217
Stable superhydrophobic coatings on various substrates are attained with an in-line atmospheric rf plasma process using CF4, H2, and He. The coating layer is composed of CFx nanoparticulates and has an average roughness of approximately 10 nm. This roughness is much smaller than other surfaces reported for superhydrophobicity in the literature. The superhydrophobic coatings are produced on both metallic and insulating substrates without any need of separate microroughening or vacuum lines. 相似文献
6.
Jeong Young Su Lee Jaegi Chun Young-Bum Uhm Young Rang Sun Gwang-Min Kim Yong Min 《Journal of Radioanalytical and Nuclear Chemistry》2021,330(2):513-519
Journal of Radioanalytical and Nuclear Chemistry - The defects due to cold-rolling deformation in the advanced reduced-activation alloy (ARAA) have been analyzed using positron annihilation... 相似文献
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Uhm H.S. Lee P.H. Kim Y.I. Kim J.H. Chang H.Y. 《IEEE transactions on plasma science. IEEE Nuclear and Plasma Sciences Society》1995,23(4):628-635
A theory is developed for the density profile of low temperature plasmas confined by applied magnetic field and an experiment of the electron-cyclotron-resonance (ECR) plasma is conducted to compare the theoretical prediction and experimental measurements. Due to a large electron mobility along the magnetic field, electrons move quickly out of the system, leaving ions behind and building a space charge potential, which leads to the ambipolar diffusion of ions. In a steady-state condition, the plasma generation by ionization of neutral molecules is in balance with plasma loss due to the diffusion, leading to the electron temperature equation, which is expressed in terms of the plasma size, chamber pressure, and the ionization energy and cross section of neutrals. The power balance condition leads to the plasma density equation, which is also expressed in terms of the electron temperature, the input microwave power and the chamber pressure. It is shown that the plasma density increases, reaches its peak and decreases, as the chamber pressure increases from a small value (0.1 mTorr). These simple expressions of electron temperature and density provide a scaling law of ECR plasma in terms of system parameters. After carrying out an experimental observation, it is concluded that the theoretical predictions of the electron temperature and plasma density agree remarkably well with experimental data 相似文献
8.
Hoyeon Lee Soojin Uhm Jung‐Won Shin Hyun Mi Jeon Sun Dongbang Hyo Sung Jung Yun‐Cheol Na Prof. Chulhun Kang Prof. Jong Seung Kim 《化学:亚洲杂志》2015,10(12):2695-2700
A galactose‐appended drug delivery system released camptothecin (CPT) to lysosomes of HepG2 hepatoma cells, resulting in the cell resistance to the anticancer drug. We found that the resistance to CPT is caused by alteration of the drug release from the prodrug in lysosomes, emphasizing that the final delivery locations may critically influence drug efficacy. 相似文献
9.
Kim H.S. Uhm H.S. 《IEEE transactions on plasma science. IEEE Nuclear and Plasma Sciences Society》2001,29(6):875-880
The performance of a klystrode is investigated for annular electron beams. Numerical simulations of the output cavity in the klystrode device are carried out by making use of the fully electromagnetic three-dimensional code, HFSS, and the fully electromagnetic, two-and-one-half-dimensional, self-consistent PIC code, MAGIC. In addition, an analytical expression to predict the efficiency and gap-field strength of the device is developed to investigate klystrode performance over a wide range of parameters. This analytical expression for the annular klystrode is developed based on the Maxwell's equations and Newton's second law of motion. The analytical results agree fairly well with data obtained numerically from the MAGIC code. The presented results indicate that the theoretical formula obtained from the analytical calculation may be useful for designing the klystrode microwave tubes 相似文献
10.
Sungyool Bong Yang-Rae Kim In Kim Seunghee Woo Sunghyun Uhm Jaeyoung Lee Hasuck Kim 《Electrochemistry communications》2010,12(1):129-131
Graphene nanosheet was prepared by modified Hummer’s chemical method and utilized as a catalyst support of PtRu nanoparticles for the electro-oxidation of methanol. Home-made graphene nanosheet was clearly characterized by Raman spectroscopy and we applied colloidal method to synthesize with high metal content of 80 wt.% Pt–Ru catalyst, which is extensively clarified by HR-TEM and XRD analysis. 80 wt.% Pt–Ru/graphene nanosheet catalyst showed superior electrochemical activity toward methanol oxidation compared to Pt–Ru/Vulcan XC-72R. It is due to the significant increase of electrochemical active surface area for better catalyst utilization. 相似文献