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수은(Hg)에 노출된 토마토 유모에 있어서 Ascorbic acid 산화에 대한 Anthocyanin의 항산화 기능
이종민,손희경,조운행 昌原大學校 基礎科學硏究所 1999 基礎科學硏究所論文集 Vol.11 No.-
토마토(Lycopersin esculentum) 유묘을 Hg에 노출시켰을 때 줄기와 잎에서 anthocyanin농도의 증가가 관찰되었으며, anthocyanin은 Hg에 의한 ascorbic acid의 산화를 억제하였다. 이러한 실험결과들은 anthocyanin의 Hg의 독성효과에 대항하여 Hg와 복합체를 형성하여 항산화제로서 중요한 역할을 할 수 있으며 ascorbic acid도 이러한 반응을 촉진시킬 수 있음을 보여준다. Mercury exposure caused an overall increase of anthocyanins in stems and leaves of tomato (Lycopersicon esculentum) seedlings. Furthermore, mercury increased the oxidation of ascorbic acid, and the oxidation reaction was suppressed by addition of anthocyanin. Our results suggest that anthocyanin not only chelates Hg ions, but also forms an ascorbic acid-metal-anthocyanin complex, which could be the possible protection mechanism from Hg-induced phytotoxicity.
김성준,이운하,이용석,전덕규 대한피부과학회 2003 大韓皮膚科學會誌 Vol.41 No.4
Dermatologists frequently perform a number of procedures without the aid of an assistant and have sometimes difficulty to obtain hemostasis during the biopsy or other minor surgery. A flat plastic cylinder made of a disposable syringe effectively stops bleeding and procedures are easily carried out with a clean surgical field. It is believed to be inexpensive, durable and easy to be sterilized. (Korean J Dermatol 2003;41(4) : 499~501)
Lee, Soo Han,Kang, Hyun Jeong,Shin, Dong-Hun,Cho, Duk-Yeon,Song, Jin Mi,Lee, Han Cheol,Kim, Gwang Ha,Song, Geun Am,Sol, Mee Young,Kim, Jee Yeon,Choi, Kyung Un,Lee, Chang Hun,Huh, Gi Young,Park, Do You Gutenberg 2009 HISTOLOGY AND HISTOPATHOLOGY Vol.24 No.7
<P>The biological characteristics of intestinal-type early gastric cancers (ICs) differ based on mucin phenotypes. Beta-catenin delocalization is a predictive marker of aggressive biological behavior (submucosal invasion and lymph node metastasis) of ICs. The presumptive causative genetic alterations leading to delocalization of beta-catenin in ICs are still controversial, and there are only a few reports regarding beta-catenin expression in gastric cancer based on mucin phenotypes. Therefore, in the current study, the expression and mechanisms of delocalization of beta-catenin were elucidated on the basis of mucin phenotypes in 109 cases of ICs. There was increased cytoplasmic and nuclear beta-catenin expression (delocalization) in ICs with a predominant intestinal mucin phenotype (ICIP; 46.3% [25/54 cases]) compared to ICs with a predominant gastric mucin phenotype (ICGP; 20% [11/55 cases]). There were no beta-catenin or APC mutations in ICs. APC promoter hypermethylation was present in 49 of 105 (46.7%) cases of ICs. There was a significant relationship between APC promoter hypermethylation and beta-catenin delocalization in ICs, especially in ICIPs. There was no relationship between beta-catenin delocalization and APC gene loss of heterozygosity in ICs. In conclusion, we showed that beta-catenin delocalization was more evident in ICIPs, and APC promoter hypermethylation might play a role in delocalization of beta-catenin, especially in ICIPs.</P>
Lee Kyu Ha,Cho Sang Un,Lee Kang Ro The Pharmaceutical Society of Korea 2005 Archives of Pharmacal Research Vol.28 No.3
The chromatographic separation of the MeOH extract from the aerial parts of Syneilesis palmata led to the isolation of a new sesquiterpene glycoside 4, together with four known compounds. Their structures were characterized to be 4$\beta$,5$\beta$-epoxy-caryophill-8,(15)-ene (1), 3$\beta$hydroxy-gultin-5-ene (2), 4$\alpha$,5$\beta$-dihydroxy-caryophill-8,(15)-ene (3), (-)-oplopan-4-one-10-$\alpha$-O$\beta$-D-glucose (4) and 3-hexenyl-1-O-$\beta$-D-glucopyranose (5), based on spectroscopic and chemical methods. Compound 2 showed moderate cytotoxicity against five human tumor cell lines in vitro with its EDso values ranging from 5.90-1 0.83 $\mu$g/mL.
The Influence of Face Shields on the Quality of Colonoscopy in the Era of the COVID-19 Pandemic
Lee Jin Wook,Lee Hyo Jeong,Kim Dae Sung,Yoon Jiyoung,Hong Seung Wook,Hwang Ha Won,Lee Jong-Soo,Kim Gwang-Un,Lee Sinwon,Choe Jaewon,Park Jin Hwa,Yang Dong-Hoon,Byeon Jeong-Sik 거트앤리버 소화기연관학회협의회 2022 Gut and Liver Vol.16 No.3
Background/Aims: The worldwide coronavirus disease 2019 pandemic has led endoscopists to use personal protective equipment (PPE) for infection prevention. This study aimed to investigate whether wearing a face shield as PPE affects the quality of colonoscopy. Methods: We reviewed the medical records and colonoscopy findings of patients who underwent colonoscopies at Asan Medical Center, Korea from March 10 to May 31, 2020. The colonoscopies in this study were performed by five gastroenterology fellows and four expert endoscopists. We compared colonoscopy quality indicators, such as withdrawal time, adenoma detection rate (ADR), mean number of adenomas per colonoscopy (APC), polypectomy time, and polypectomy adverse events, both before and after face shields were added as PPE on April 13, 2020. Results: Of the 1,344 colonoscopies analyzed, 715 and 629 were performed before and after the introduction of face shields, respectively. The median withdrawal time was similar between the face shield and no-face shield groups (8.72 minutes vs 8.68 minutes, p=0.816), as was the ADR (41.5% vs 39.8%, p=0.605) and APC (0.72 vs 0.77, p=0.510). Polypectomy-associated quality indicators, such as polypectomy time and polypectomy adverse events were also not different between the groups. Quality indicators were not different between the face shield and no-face shield groups of gastroenterology fellows, or of expert endoscopists. Conclusions: Colonoscopy performance was not unfavorably affected by the use of a face shield. PPE, including face shields, can be recommended without a concern about colonoscopy quality deterioration.
Lee, Chang-Hoon,Lee, Ji-Hye,Sung, Chan-Gyoung,Moon, Seong-Dae,Kang, Sin-Kil,Lee, Jong-Hyeon,Yim, Un Hyuk,Shim, Won Joon,Ha, Sung Yong The Malacological Society of Korea 2014 The Korean Journal of Malacology Vol.30 No.4
The bioaccumulation of 16 United States Environmental Protection Agency (USEPA) priority polycyclic aromatic hydrocarbons (PAHs) and alkylated PAHs in the Manila clam, Ruditapes philippinarum exposed to sediments artificially contaminated by Iranian Heavy Crude Oil was measured and the biota-sediment accumulation factor (BSAF) was estimated through laboratory experiments. The proportion of 16 PAHs accumulated in the tissue of R. philippinarum was only from 3 to 7% of total PAHs. Among 16 PAHs, the concentration of naphthalene was highest in the tissue. Alkylated PAHs were highly accumulated more than 93% of total PAHs. The C3 dibenzothiophene was most highly accumulated. The relative composition of alkylated naphthalenes in the tissue of R. philippinarum was lower than in the sediments. In contrast, those of alkylated compounds of fluorenes, phenanthrenes, dibenzothiophenes were higher in the tissue than the sediments. The BSAF for sum of 16 PAHs was 0.11 to 0.13 g carbon/g lipid and that for alkylated PAHs was 0.05 to 0.06 g carbon/g lipid. Naphthalene showed the highest BSAF value. Alkylated PAHs with the same parent compound, BSAF tended to increase with the number of alkylated branch increased, except for alkylated chrysenes. BSAF of total PAHs lies between that of field-based values, and are also similar to those of other persistent organic pollutants (PCBs, DDTs, HCHs). This study provides the BSAF values of individual alkylated PAHs accumulated in R. philippinarum for the first time and will be used as a basis for further understanding the bioaccumulation of organic contaminants in the marine benthic organisms.
Low Temperature Growth of Single-walled Carbon Nanotube Forest
Lee, Il-Ha,Im, Ji-Woon,Kim, Un-Jeong,Bae, Eun-Ju,Kim, Kyoung-Kook,Lee, Eun-Hong,Lee, Young-Hee,Hong, Seung-Hun,Min, Yo-Sep Korean Chemical Society 2010 Bulletin of the Korean Chemical Society Vol.31 No.10
Forest of single-walled carbon nanotubes (SWNTs) was grown at $450^{\circ}C$ by water-plasma chemical vapor deposition using ultrathin iron on alumina supporting film. The growth rate of the SWNT forest is ${\sim}0.9\;{\mu}m/min$, and the diameters of nanotubes are mainly in a range of 3.0 ~ 3.5 nm. The low intensity ratio of D- to G-band ($I_D/I_G$ ~ 0.098) in Raman spectra indicates that our SWNT forest grown at $450^{\circ}C$ is fairly pure and crystalline. This low temperature growth of SWNT forest may enable variable applications requiring the vertically-aligned nanotubes to obtain large surface area.
Lee, Changkeun,Hong, Seongjin,Noh, Junsung,Lee, Junghyun,Yoon, Seo Joon,Kim, Taewoo,Kim, Hosang,Kwon, Bong-Oh,Lee, Hanbyul,Ha, Sung Yong,Ryu, Jongseong,Kim, Jae-Jin,Kwon, Kae Kyoung,Yim, Un Hyuk,Khim, Elsevier Applied Science Publishers 2019 Environmental pollution Vol.252 No.1
<P><B>Abstract</B></P> <P>While various bioremediation techniques have been widely used at oil spill sites, the in situ efficiency of such techniques on recovering the benthic communities in intertidal areas has not been quantified. Here, the performance of several bioremediation tools such as emulsifiers, multi-enzyme liquid (MEL), microbes, and rice-straw was evaluated by a 90-days semi-field experiment, particularly targeting recovery of benthic community. Temporal efficiency in the removal of sedimentary total petroleum hydrocarbons (TPH), reduction of residual toxicity, and recovery of bacterial diversity, microalgal growth, and benthic production was comprehensively determined. Concentrations of TPH and amphipod mortality for all treatments rapidly decreased within the first 10 days. In addition, the density of bacteria and microphytobenthos generally increased over time for all treatments, indicating recovery in the benthic community health. However, the recovery of some nitrifying bacteria, such as the class Nitrospinia (which are sensitive to oil components) remained incomplete (13–56%) during 90 days. Combination of microbe treatments showed rapid and effective for recovering the benthic community, but after 90 days, all treatments showed high recovery efficiency. Of consideration, the “no action” treatment showed a similar level of recovery to those of microbe and MEL treatments, indicating that the natural recovery process could prevail in certain situations.</P> <P><B>Highlights</B></P> <P> <UL> <LI> Residual hydrocarbons and amphipod toxicity rapidly decreased within 10 days. </LI> <LI> Quick recovery found for most of the bacteria, but some remained incomplete at >90 d. </LI> <LI> Microphytobenthos community took more than 90 days to recover against oil exposure. </LI> <LI> Combination of microbe treatments were effective for recovering the benthic community. </LI> <LI> “No action” showed comparable recovery to others, indicating prevailing natural recovery. </LI> </UL> </P> <P><B>Graphical abstract</B></P> <P>[DISPLAY OMISSION]</P>