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- 주제어 : oxidation suppression (검색결과 22 건)
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Kwon, Jinhyeong,Cho, Hyunmin,Eom, Hyeonjin,Lee, Habeom,Suh, Young Duk,Moon, Hyunjin,Shin, Jaeho,Hong, Sukjoon,Ko, Seung Hwan American Chemical Society 2016 ACS APPLIED MATERIALS & INTERFACES Vol.8 No.18
<P>Copper nanomaterials suffer from severe oxidation problem despite the huge cost effectiveness. The effect of two different processes for conventional tube furnace heating and selective laser sintering on copper nanoparticle paste is compared in the aspects of chemical, electrical and surface morphology. The thermal behavior of the copper thin films by furnace and laser is compared by SEM, XRD, FT-IR, and XPS analysis. The selective laser sintering process ensures glow annealing temperature, fast processing speed with remarkable oxidation suppression even in air environment while conventional tube furnace heating experiences moderate oxidation even in Ar environment. Moreover, the laser-sintered copper nanoparticle thin film shows good electrical property and reduced oxidation than conventional thermal heating process. Consequently, the proposed selective laser sintering process can be compatible with plastic substrate for copper based flexible electronics applications.</P>
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노태호,심이레 한국표면공학회 2023 한국표면공학회지 Vol.56 No.4
In recent years, energy-management studies in buildings have proven useful for energy savings. Typically, during heating and cooling, the energy from a given building is lost through its windows. Generally, to block the entry of ultraviolet (UV) and infrared (IR) rays, thin films of deposited metals or metal oxides are used, and the blocking of UV and IR rays by these thin films depends on the materials deposited on them. Therefore, by controlling the thicknesses and densities of the thin films, improving the transmittance of visible light and the blocking of heat rays such as UV and IR may be possible. Such improvements can be realized not only by changing the two-dimensional thin films but also by altering the zero-dimensional (0-D) nanostructures deposited on the films. In this study, 0-D nanoparticles were synthesized using a sol –gel procedure. The synthesized nanoparticles were deposited as deep coatings on polymer and glass substrates. Through spectral analysis in the UV–visible (vis) region, thin-film layers of deposited zinc oxide nanoparticles blocked >95 % of UV rays. For high transmittance in the visible-light region and low transmittance in the IR and UV regions, hybrid multiple layers of silica nanoparticles, zinc oxide particles, and fluorine-doped tin oxide nanoparticles were formed on glass and polymer substrates. Spectrophotometry in the UV–vis–near-IR regions revealed that the substrates prevented heat loss well. The glass and polymer substrates achieved transmittance values of 80 % in the visible-light region, 50 % to 60 % in the IR region, and 90 % in the UV region.
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Suppressive Effects of Dihydroxyanthraquinone Derivatives against Inducible Nitric Oxide Synthase
이회선 한국응용생명화학회 2010 Applied Biological Chemistry (Appl Biol Chem) Vol.53 No.6
Inhibitory effects of Cassia tora seed-derived materials against nitric oxide (NO) production were determined via evaluation of NO production. Inhibitory effects of 1,8-dihydroxyanthraquinone and 1,5-dihydroxyanthraquinone against NO production were 71.5 and 61.1% at 5 μg/mL, respectively. The suppressive effects of 1,8-dihydroxyanthraquinone completely blocked iNOS protein expression at 20 μM.
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Suppressive Effects of Dihydroxyanthraquinone Derivatives against Inducible Nitric Oxide Synthase
Lee, Hoi-Seon The Korean Society for Applied Biological Chemistr 2010 Applied Biological Chemistry (Appl Biol Chem) Vol.53 No.6
Inhibitory effects of Cassia tora seed-derived materials against nitric oxide (NO) production were determined via evaluation of NO production. Inhibitory effects of 1,8-dihydroxyanthraquinone and 1,5-dibydroxyanthraquinone against NO production were 71.5 and 61.1% at $5\;{\mu}g$/mL, respectively. The suppressive effects of 1,8-dihydroxyanthraquinone completely blocked iNOS protein expression at $20\;{\mu}M$.
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Functions of TET Proteins in Hematopoietic Transformation
Han, Jae-A,An, Jungeun,Ko, Myunggon Korean Society for Molecular and Cellular Biology 2015 Molecules and cells Vol.38 No.11
DNA methylation is a well-characterized epigenetic modification that plays central roles in mammalian development, genomic imprinting, X-chromosome inactivation and silencing of retrotransposon elements. Aberrant DNA methylation pattern is a characteristic feature of cancers and associated with abnormal expression of oncogenes, tumor suppressor genes or repair genes. Ten-eleven-translocation (TET) proteins are recently characterized dioxygenases that catalyze progressive oxidation of 5-methylcytosine to produce 5-hydroxymethylcytosine and further oxidized derivatives. These oxidized methylcytosines not only potentiate DNA demethylation but also behave as independent epigenetic modifications per se. The expression or activity of TET proteins and DNA hydroxymethylation are highly dysregulated in a wide range of cancers including hematologic and non-hematologic malignancies, and accumulating evidence points TET proteins as a novel tumor suppressor in cancers. Here we review DNA demethylation-dependent and -independent functions of TET proteins. We also describe diverse TET loss-of-function mutations that are recurrently found in myeloid and lymphoid malignancies and their potential roles in hematopoietic transformation. We discuss consequences of the deficiency of individual Tet genes and potential compensation between different Tet members in mice. Possible mechanisms underlying facilitated oncogenic transformation of TET-deficient hematopoietic cells are also described. Lastly, we address non-mutational mechanisms that lead to suppression or inactivation of TET proteins in cancers. Strategies to restore normal 5mC oxidation status in cancers by targeting TET proteins may provide new avenues to expedite the development of promising anti-cancer agents.
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Cheol Hee Jung,Ji Yeon Sim,Won Sik Ahn 대한마취과학회 2010 Korean Journal of Anesthesiology Vol.58 No.1
Background: Nitrous oxide concentration is easily controlled by respiratory ventilation. It suppresses bone marrow via the inhibition of thymidylate synthesis. The aim of this work was to determine the optimal pressure and exposure duration of nitrous oxide, as well as methotrexate concentration that maximizes the suppression of 4 cancer cells: CCRF-CEM, K562, A549 and MDA-MB-231. Methods: Each cancer cell was cultured in a hyperbaric chamber at 1, 2 and 3 atmosphere of 74% nitrous oxide for 24, 48, and 72 hours at 0, 0.3, 0.7, 1, 2, 5 and 10 μM methotrexate (MTX), respectively. The results were expressed in the ratio of the number of cancer cells cultured under specific conditions (S cells) to that under normal conditions (N cells). Results: The S/N ratio of CCRF-CEM cells was 87.4% in 24-hour culture, 95.0% in 48-hour culture and 115.9% in 72-hour culture (P<0.05). The S/N ratio of K562 cells was 103.6% at 1 atm, 102.4% at 2 atm and 115.6% at 3 atm (P<0.05). The S/N ratio of A549 cells was 94.3% at 1 atm, 94.1% at 2 atm, 99.3% at 3 atm, 96.2% in 24-hour culture, 99.2% in 48-hour culture and 99.3% in 72-hour culture (P>0.05). However, the S/N ratio of MDA-MB 231 cells was 66.9% in 24-hour culture, 83.1% in 48 hour culture and 87.8% in 72-hour culture (P<0.05). Conclusions: Only the growth of the MDA-MB-231 cells was significantly reduced after a longer exposure time to nitrous oxide, but those of the other cells were not. (Korean J Anesthesiol 2010; 58: 61~69)
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Functions of TET Proteins in Hematopoietic Transformation
한재아,안정은,고명곤 한국분자세포생물학회 2015 Molecules and cells Vol.38 No.11
DNA methylation is a well-characterized epigenetic modification that plays central roles in mammalian development, genomic imprinting, X-chromosome inactivation and silencing of retrotransposon elements. Aberrant DNA methylation pattern is a characteristic feature of cancers and associated with abnormal expression of oncogenes, tumor suppressor genes or repair genes. Ten-eleven-translocation (TET) proteins are recently characterized dioxygenases that catalyze progressive oxidation of 5-methylcytosine to produce 5- hydroxymethylcytosine and further oxidized derivatives. These oxidized methylcytosines not only potentiate DNA demethylation but also behave as independent epigenetic modifications per se. The expression or activity of TET proteins and DNA hydroxymethylation are highly dysregulated in a wide range of cancers including hematologic and non-hematologic malignancies, and accumulating evidence points TET proteins as a novel tumor suppressor in cancers. Here we review DNA demethylation-dependent and -independent functions of TET proteins. We also describe diverse TET loss-of-function mutations that are recurrently found in myeloid and lymphoid malignancies and their potential roles in hematopoietic transformation. We discuss consequences of the deficiency of individual Tet genes and potential compensation between different Tet members in mice. Possible mechanisms underlying facilitated oncogenic transformation of TET-deficient hematopoietic cells are also described. Lastly, we address non-mutational mechanisms that lead to suppression or inactivation of TET proteins in cancers. Strategies to restore normal 5mC oxidation status in cancers by targeting TET proteins may provide new avenues to expedite the development of promising anti-cancer agents.
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Lee, Hoi-Seon The Korean Society for Applied Biological Chemistr 2009 Applied Biological Chemistry (Appl Biol Chem) Vol.52 No.5
The inhibitory effects of components derived from Cinnamomum cassia leaf on nitric oxide (NO) production in RAW 264.7 cells and on expression of inducible NO synthase (iNOS) were determined and compared to those of three commercially available components. Spectral analysis characterized the active constituent of this C. cassia extract as cinnamyl alcohol. The inhibitory effects varied with both chemical and concentration used. Cinnamyl alcohol showed inhibitory effects on NO production of 62.5%, 41.8%, and 22.1% at 1.0, 0.5, and 0.1 ${\mu}g/{\mu}L$, respectively. However, little or no inhibitory effect was observed for cedrene, cinnamic acid, copaene, eugenol, and limonene. Suppression effects of cinnamyl alcohol on iNOS expression were revealed by Western blot analysis. As a naturally occurring therapeutic agent, cinnamyl alcohol could be useful for developing new types of NO inhibitors.
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이회선 한국응용생명화학회 2009 Applied Biological Chemistry (Appl Biol Chem) Vol.52 No.5
The inhibitory effects of components derived from Cinnamomum cassia leaf on nitric oxide (NO) production in RAW 264.7 cells and on expression of inducible NO synthase (iNOS) were determined and compared to those of three commercially available components. Spectral analysis characterized the active constituent of this C. cassia extract as cinnamyl alcohol. The inhibitory effects varied with both chemical and concentration used. Cinnamyl alcohol showed inhibitory effects on NO production of 62.5%, 41.8%, and 22.1% at 1.0, 0.5, and 0.1 µg/µL, respectively. However, little or no inhibitory effect was observed for cedrene, cinnamic acid, copaene, eugenol, and limonene. Suppression effects of cinnamyl alcohol on iNOS expression were revealed by Western blot analysis. As a naturally occurring therapeutic agent, cinnamyl alcohol could be useful for developing new types of NO inhibitors.
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