http://chineseinput.net/에서 pinyin(병음)방식으로 중국어를 변환할 수 있습니다.
변환된 중국어를 복사하여 사용하시면 됩니다.
Park, Jun Chul,Lee, Min-Chul,Yoon, Deok-Seo,Han, Jeonghoon,Kim, Moonkoo,Hwang, Un-Ki,Jung, Jee-Hyun,Lee, Jae-Seong Elsevier 2018 Aquatic toxicology Vol.199 No.-
<P><B>Abstracts</B></P> <P>To understand the adverse outcome in response to bisphenol A and its analogs bisphenol F and S (BPA, BPF, and BPS), we examined acute toxicity, life parameter, and defensome in the marine rotifer <I>Brachionus koreanus</I>. Among the bisphenol analogs, BPA showed the highest acute toxicity and then BPF and BPS, accordingly in the view of descending magnitude of toxicity. In life parameters including life span and reproduction, BPA, BPF, and BPS were found to cause adverse effect. Both intracellular ROS level and GST activity were significantly increased (<I>P <</I> 0.05) in response to each dosage of bisphenol analogs exposures. In response to bisphenol analogs, defensomes of phase I, II, and III detoxification mechanism demonstrated inverse relationship between the lipophilicity of bisphenol analogs and the expression patterns of defensomes. BPA and BPF were found to have significant modulation (<I>P <</I> 0.05) in the expression of cytochrome P450 (<I>CYP</I>) and <I>GST</I> genes. In phase III, BPS with comparatively lower lipophilicity demonstrated highly diversified expressional pattern, suggesting that BPS is likely caused less toxicity compared to BPA and BPF. In this study, via phase I, II, and III detoxification mechanism, bisphenol A and its analogs F and S demonstrated specific detoxification mechanism in rotifer.</P> <P><B>Highlights</B></P> <P> <UL> <LI> BPA showed the highest acute toxicity and then BPF and BPS. </LI> <LI> BPA, BPF, and BPS were found to cause adverse effect in life parameters. </LI> <LI> Both intracellular ROS level and GST activity were significantly increased upon bisphenol analogs exposure. </LI> <LI> Expression of defensomes showed inverse relationship between the lipophilicity of bisphenol analogs in response to bisphenol analogs. </LI> <LI> BPA and BPF were found to have significant modulation in the expression of CYP and GST genes. </LI> </UL> </P>
Effect of Reducing Ammonia Volatilization from the Arable Soil with Iron Sulfate
Seong Min Park,Sung Un Kim,Chang Oh Hong 한국토양비료학회 2020 한국토양비료학회지 Vol.53 No.4
Ammonia (NH₃) reacts with nitric acid or sulfuric acid in the atmosphere and contributes to the formation of fine particulate matter. It is mainly produced by application of nitrogen fertilizer and livestock manure to the arable soil. Volatilization of NH₃ could decrease with application of acidic amendments such as iron sulfate (FeSO₄) through decreasing soil pH. This study was conducted to determine an optimum application rate of FeSO₄ to reduce NH₃ volatilization and maintain crop productivity in arable soil. Iron sulfate was applied at the rates of 0, 50, 100, and 200 ㎏ Fe ㏊<SUP>-1</SUP>. Cabbage (Brassica rapa L.) was planted on April 8<SUP>th</SUP> 2020 and harvested on June 10<SUP>th</SUP> 2020. The NH₃ gas was collected using static chamber (300 ㎜ in length and 120 ㎜ diameter) method. Cumulative NH₃-N volatilization decreased significantly with increasing application rate of FeSO₄. It decreased by ca. 21% at 200 ㎏ Fe ㏊<SUP>-1</SUP> of FeSO₄. Soil pH decreased significantly with increasing application rate of FeSO₄. A decrease in cumulative NH₃-N volatilization with FeSO₄ was mainly attributed to decrease in soil pH. Cabbage yield did not decreased with increasing application rate of FeSO₄. The maximum cabbage yield was 7.10 Mg ㏊<SUP>-1</SUP> and cumulative NH₃-N volatilization decreased by 10.2% from 28.4 ㎏ ㏊<SUP>-1</SUP> 63 days<SUP>-1</SUP> to 25.8 ㎏ ㏊<SUP>-1</SUP> 63 days<SUP>-1</SUP> with 110 ㎏ Fe ㏊<SUP>-1</SUP> of FeSO₄ application.
Park, Tae Joo,Kim, Jeong Hwan,Jang, Jae Hyuck,Kim, Un Ki,Lee, Sang Young,Lee, Joohwi,Jung, Hyung Suk,Hwang, Cheol Seong American Chemical Society 2011 Chemistry of materials Vol.23 No.7
<P>A new model for the growth behavior of saturated HfO<SUB>2</SUB> films by atomic layer deposition (ALD) was suggested. The well-known ALD saturation of the growth rate with increasing precursor input was observed, but the full saturation required an extremely long feeding time. After the rapid increase in growth rate with increasing precursor feeding time, a pseudo-saturation region was observed where full saturation was hindered by the “screening effect” of the physisorbed precursor molecules or byproduct molecules on the chemisorbed species. The physisorbed precursor molecules screen the active adsorption sites for the following precursor. The discrete feeding method, which is the modified process recipe suggested in this study, provided improved growth behavior and electrical properties of the film.</P><P>A new model for the growth behavior of atomic-layer-deposited film was suggested. A pseudo-saturation region was observed where full saturation was hindered by the “screening effect” of the physisorbed precursor molecules or byproduct molecules on chemisorbed species. The discrete feeding method provided improved growth behavior and electrical properties of the film.</P><P><B>Graphic Abstract</B> <IMG SRC='http://pubs.acs.org/appl/literatum/publisher/achs/journals/content/cmatex/2011/cmatex.2011.23.issue-7/cm100900k/production/images/medium/cm-2010-00900k_0005.gif'></P>
Bilateral Retinal Dysplasia and Secondary Glaucoma Associated with Homozygous Protein C Deficiency
( Un Chul Park ),( Ho Kyung Choung ),( Seong Joon Kim ),( Young Suk Yu ) 대한안과학회 2005 Korean Journal of Ophthalmology Vol.19 No.2
Purpose: Protein C deficiency is an autosomal recessive disorder, which predisposes the patient to potentially blinding and widespread lethal thromboembolic complications, especially in the homozygous type. We here report the first Korean case of ophthalmic involvement and its surgical treatment in homozygous protein C deficiency. Methods: A 3.4kg, full term girl was born by normal delivery but showed bilateral leukocoria on day 2. Laboratory results disclosed a very low protein C activity level (10%) in the patient and moderately decreased levels in the other family members. Ophthalmic examination showed bilateral corneal opacity and shallow anterior chamber. B-scan ultrasonography which showed intravitreal mass lesions without microphthalmos and a funnel-shaped retinal detachment suggested bilateral retinal dysplasia. Results: As the eyes were under progression of secondary glaucoma, bilateral lensectomies were performed at 2 months old and corneal opacity was regressed to some degree. However, at 14 months old, the left eye showed moderate corneal opacity with a band keratopathy. Conclusions: Although visual outcome was very poor after surgery, we could impede or slow down the progression of secondary glaucoma and save the eyeballs in the infant with homozygous protein C deficiency.
Park, Sang-Un,Ahn, Deok-Jong,Jeon, Hyeon-Jeong,Kwon, Tae-Ryong,Lim, Hyoun-Sub,Choi, Bo-Seong,Baek, Kwang-Hyun,Bae, Han-Hong The Korean Society of Ginseng 2012 Journal of Ginseng Research Vol.36 No.2
An light-emitting diode (LED)-based light source was used as a monochromatic light source to determine the responses of raw ginseng roots (Panax ginseng Meyer) to specific emission spectra with respect to the production of ginsenosides. The ginsenoside content in the ginseng roots changed in response to the LED light treatments at $25^{\circ}C$ relative to the levels in the control roots that were treated in the dark or at $4^{\circ}C$ for 7 d. Ginseng roots were exposed to LEDs with four different peak emission wavelengths, 380, 450, 470, and 660 nm, in closed compartments. Compared with the control $4^{\circ}C$-treated roots, roots that were treated with 450 and 470 nm light showed a significantly increased production of ginsenosides (p<0.05), with increases of 64.9% and 74.1%, respectively. The contents of the ginsenosides $Rb_2$, Rc, and $Rg_1$ were significantly higher (p<0.05) in the 450 and 470 nm-treated root samples. The ratio of protopanaxadiol ginsenosides ($Rb_1$, $Rb_2$, Rc, and Rd) to protopanaxatriol ginsenosides ($Rb_1$, $Rb_2$, Re, and Rf) was significantly higher (p<0.05) in the 450 and 470 nm-treated root samples than in the control $4^{\circ}C$-treated roots. This is the first report that demonstrates the increase and conversion of ginsenosides in raw ginseng roots in response to exposure to LED light.
Effect of Polysilicon Wettability on Polishing and Organic Defects during CMP
Park, Jin-Goo,Prasad, Y. Nagendra,Kang, Young-Jae,Kim, In-Kwon,Hong, Yi-Koan,Han, Sang-Yeob,Yun, Seong-Kyu,Yoon, Bo-Un,Busnaina, Ahmed A. The Electrochemical Society 2009 Journal of the Electrochemical Society Vol.156 No.11
Park, Jun Chul,Lee, Min-Chul,Yoon, Deok-Seo,Han, Jeonghoon,Park, Heum Gi,Hwang, Un-Ki,Lee, Jae-Seong Elsevier/North Holland Biomedical Press 2019 Aquatic toxicology Vol.209 No.-
<P><B>Abstract</B></P> <P>In this study, the entire glutathione <I>S</I>-transferases (GSTs), the major phase II detoxification enzyme, were identified in two marine copepod species <I>Tigriopus japonicus</I> and <I>Paracyclopina nana</I>. The genome-wide identification of GSTs in <I>T. japonicus</I> and <I>P. nana</I> resulted in 32 and 20 GSTs in total, respectively. Among the identified GSTs, two specific classes of GSTs, specifically sigma and delta/epsilon GSTs were the dominant form of cytosolic GSTs in <I>T. japonicus</I>, while delta/epsilon and mu classes were dominant cytosolic GSTs in <I>P. nana</I>. In addition, Membrane-Associated Proteins in Eicosanoid and Glutathione metabolism (MAPEG) family were found in relatively higher proportion compared to other classes. Moreover, sigma, delta/epsilon, and microsomal GSTs have shown to expand through tandem duplication. To validate the detoxification function of the identified GSTs, both copepods were exposed to copper (Cu<SUP>2+</SUP>) and the reactive oxygen species (ROS) level and GST activity were measured. With integration of phylogenetic analysis and xenobiotic-mediated <I>GST</I> mRNA expression patterns along with previous enzymatic activities, the functional divergence among species-specific <I>GST</I> genes was clearly observed. This study covers full identification of GST classes in two marine copepod species and their important role in marine environmental ecotoxicology.</P> <P><B>Highlights</B></P> <P> <UL> <LI> The genome-wide identification of GSTs in <I>T. japonicus</I> and <I>P. nana</I> resulted in 32 and 20 GSTs in total. </LI> <LI> GSTs sigma and delta/epsilon GSTs were the dominant form in <I>T. japonicus.</I> </LI> <LI> Delta/epsilon and mu GSTs classes were dominant cytosolic GSTs in <I>P. nana</I>. </LI> <LI> Both copepods were exposed to copper and the ROS level and GST activity were measured. </LI> <LI> Functional divergence among species-specific <I>GST</I> genes was clearly observed with GST enzymatic activities. </LI> </UL> </P>