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- 저자 : ( Haeri Baek ) (검색결과 2 건)
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Kim, Haeri,Moon, Seon Young,Kim, Shin-Ik,Baek, Seung-Hyub,Jang, Ho Won,Kim, Dong-Wook American Chemical Society 2014 ACS APPLIED MATERIALS & INTERFACES Vol.6 No.16
<P>We investigated the influences of charge writing on the surface work function (<I>W</I>) and sheet resistance (<I>R</I>) of the LaAlO<SUB>3</SUB>/SrTiO<SUB>3</SUB> (LAO/STO) heterointerface in several gas environments: H<SUB>2</SUB>(2%)/N<SUB>2</SUB>(98%), air, N<SUB>2</SUB>, and O<SUB>2</SUB>. The decrease in <I>W</I> and <I>R</I> due to charge writing was much larger in air (Δ<I>W</I> = −0.45 eV and Δ<I>R</I> = −40 kΩ/<I>S</I>) than in O<SUB>2</SUB> (Δ<I>W</I> = −0.21 eV and Δ<I>R</I> = −19 kΩ/<I>S</I>). The reduced <I>R</I> could be maintained more than 100 h in H<SUB>2</SUB>/N<SUB>2</SUB>. Such distinct behaviors were quantitatively discussed, based on the proposed charge-writing mechanisms. Such analyses showed how several processes, such as carrier transfer via surface adsorbates, surface redox, electronic state modification, and electrochemical surface reactions, contributed to charge writing in each gas.</P><P><B>Graphic Abstract</B> <IMG SRC='http://pubs.acs.org/appl/literatum/publisher/achs/journals/content/aamick/2014/aamick.2014.6.issue-16/am503367f/production/images/medium/am-2014-03367f_0008.gif'></P><P><A href='http://pubs.acs.org/doi/suppl/10.1021/am503367f'>ACS Electronic Supporting Info</A></P>
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S-58 H. pylori infection is associated with subclinical coronary atherosclerosis in healthy subjects
( Minyoung Lee ),( Haeri Baek ),( Jong Suk Park ),( Sohee Kim ),( Chanhee Kyung ),( Sangbae Lee ),( Jihong You ),( Su Jung Baik ),( Byoung Kwon Lee ),( Jie-hyun Kim ),( Chul Woo Ahn ),( Kyung Rae Kim 대한내과학회 2016 대한내과학회 추계학술대회 Vol.2016 No.1
Background/Aims: Helicobacter pylori (H. pylori) is a gastrointestinal pathogen known to be associated with cardiovascular disease (CVD). However, most reports about the effect of H. pylori on CVD were investigated in patients with a previous history of CVD and little is known in healthy subjects. We evaluated the association between H. pylori infection and subclinical atherosclerosis using cardiac multidetector computed tomography (MDCT) in healthy subjects without CVD history. Methods: From December 2007 to February 2014, 471 subjects who underwent all of rapid urease test (CLO test), pulse-wave velocity (PWV) and MDCT for health check-up were enrolled. H. pylori infection was defined by CLO test positivity on endoscopic gastric biopsy. Significant coronary artery stenosis was defined as ≥50% stenosis in any major epicardial coronary vessel on MDCT. Results: The CLO-positive subjects had a lower high density lipoprotein-cholesterol (HDL-cholesterol) level than the CLO-negative subjects. Although there was no difference in the mean value of PWV, the incidence of significant coronary stenosis was higher in CLO-positive group (7.9% versus 2.9%, p=0.01). Also, the number of subjects with coronary artery calcium score>0 and Log{(Number of segments with plaque)+1} were slightly higher in CLO-positive group. CLO-positive group was 3-fold more likely to have significant coronary artery stenosis even after adjusting confounding factors (adjusted OR 3.081, 95% confidence interval 1.169-8.119, p=0.02). Conclusions: In a healthy population, current H. pylori infection was associated with significant subclinical coronary artery stenosis. The causal effect of H. pylori on subclinical atherosclerosis in a ‘healthy’ population remains to be investigated further.
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