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- 저자 : Hong Lai (검색결과 125 건)
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String scattering amplitudes and deformed cubic string field theory
Lai, Sheng-Hong,Lee, Jen-Chi,Lee, Taejin,Yang, Yi North-Holland Pub. Co 2018 Physics letters. Section B Vol.776 No.-
<P><B>Abstract</B></P> <P>We study string scattering amplitudes by using the deformed cubic string field theory which is equivalent to the string field theory in the proper-time gauge. The four-string scattering amplitudes with three tachyons and an arbitrary string state are calculated. The string field theory yields the string scattering amplitudes evaluated on the world sheet of string scattering whereas the conventional method, based on the first quantized theory brings us the string scattering amplitudes defined on the upper half plane. For the highest spin states, generated by the primary operators, both calculations are in perfect agreement. In this case, the string scattering amplitudes are invariant under the conformal transformation, which maps the string world sheet onto the upper half plane. If the external string states are general massive states, generated by non-primary field operators, we need to take into account carefully the conformal transformation between the world sheet and the upper half plane. We show by an explicit calculation that the string scattering amplitudes calculated by using the deformed cubic string field theory transform into those of the first quantized theory on the upper half plane by the conformal transformation, generated by the Schwarz–Christoffel mapping.</P>
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Therapeutic Effect of Ginsenoside Rd in Rats with TNBS-Induced Recurrent Ulcerative Colitis
Xiao-Lai Yang,Yong-Jie Wu,Tian-Kang Guo,Yan-Hong Wang,Ming-Tang Gao,Hong Qin 대한약학회 2012 Archives of Pharmacal Research Vol.35 No.7
Ulcerative colitis (UC) is characterized by oxidative and nitrosative stress and neutrophil infiltration. In the present study, we aimed to investigate the therapeutic effect of ginsenoside Rd (GRd) in rats with 2,4,6-trinitrobenzenesulfonic acid (TNBS)-induced recurrent UC. After UC was twice-induced by intracolonic injection of TNBS, rats were intragastrically administered different doses of GRd per day for 7 days. The colonic lesions and inflammation were evaluated both histologically and biochemically. Compared with the TNBS group, GRd treatment facilitated recovery of pathologic changes in the colon after induction of recurrent UC, as evidenced by a significant reduction of colonic weight/length ratio and macroscopic and microscopic damage scores (p < 0.01). The myeloperoxidase and inducible nitric oxide synthase activities with malonyldialdehyde and nitric oxide levels in colonic tissues were significantly decreased in the GRd group compared with those in the TNBS group (p < 0.01). GRd treatment was associated with remarkably increased superoxide dismutase and glutathione peroxidase activities. Results showed a valuable effect of GRd against TNBS-induced recurrent UC by inhibiting neutrophil infiltration and promoting the antioxidant capacity of the damaged colonic tissue.
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Recent developments in superhydrophobic surfaces with unique structural and functional properties
Zhang, Yong-Lai,Xia, Hong,Kim, Eunkyoung,Sun, Hong-Bo The Royal Society of Chemistry 2012 SOFT MATTER Vol.8 No.44
<P>The surface wettability control of solid materials has been considered as an essential aspect of surface chemistry. In the past decade, superhydrophobic surfaces have revealed a cornucopia of novel structural and functional properties, exhibiting considerable importance in both fundamental research and practical applications. In this review, we summarize the recent developments of superhydrophobic surfaces with unique structural and functional properties. Both the fabricative methods and the working performance of superhydrophobic surfaces with multidisciplinary functionalities including self-cleaning, icephobicity, anti-corrosion, drag reduction, transparency, anti-reflection, structural color, droplet transportation, anisotropy, oil–water separation, water supporting force, superamphiphobicity and responsive switching, have been discussed briefly. Finally, the current challenges and future prospects of this dynamic field are discussed based on our own opinion.</P> <P>Graphic Abstract</P><P>This review highlights the recent developments in superhydrophobic surfaces with unique structure-defined functionalities towards a wide range of applications. <IMG SRC='http://pubs.rsc.org/services/images/RSCpubs.ePlatform.Service.FreeContent.ImageService.svc/ImageService/image/GA?id=c2sm26517f'> </P>
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태생 및 수유기에 알코올에 노출된 신생 흰쥐의 Liver Microsomal Mixed Function Oxidase System과 Lipid Peroxidation의 변화
홍영숙,함윤애,이희래 梨花女子大學校 醫科大學 醫科學硏究所 1989 EMJ (Ewha medical journal) Vol.12 No.3
Maternal ingestion of alcohol produce not only change of drug metabolism but also proliferation of hepatic smooth endoplasmic reticulum and many developmental defects of the central nervous system. The present investigation examined the effects of maternal consumption of alcohol during pregnancy and/or lactation the activities of electron transfer components, mixed function monooxygenase, UDP-glucuronosyltransferase and lipid peroxidation of neonatal rat liver microsomes. Normal group consisted of neonatal rats whose mothers received standard chow and water. The subject of experimental group were neonatal rats whose mothers were exposed to alcohol during pregnancy and lactation(3 weeks). The results were obtained as follows : The activities of the electron transfer system, such as cytochrome P-450, NADPH-cytochrome C reductase were increased in hepatic microsomes of experimental group. The activities of the mixed function monooxygenase, p-nitroanisole-O-demethylase and the conjugated enzyme, UDP-glucuronosyltransferase were increased in hepatic microsomal experimental group. There was no significant differences between the formation of lipid peroxide of normal and experimental group. These results suggest that prenatal exposure to alcohol are influenced by disturb of liver microsomal drug metabolism, especially during the fetal period.
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Lai, Shiau-Wu,Park, Ji-Won,Yoo, Sung-Ho,Ha, Jum-Mok,Song, Er-Hong,Cho, Sung-Oh Elsevier 2016 International journal of hydrogen energy Vol.41 No.5
<P><B>Abstract</B></P> <P>Pd-incorporated H<SUB>2</SUB>Ti<SUB>3</SUB>O<SUB>7</SUB> nanowires are synthesized using a facile one-step procedure. H<SUB>2</SUB>Ti<SUB>3</SUB>O<SUB>7</SUB> nanowires are prepared using a modified alkaline hydrothermal method and Pd is incorporated into the H<SUB>2</SUB>Ti<SUB>3</SUB>O<SUB>7</SUB> nanowires using a photodeposition technique. The prepared Pd-incorporated H<SUB>2</SUB>Ti<SUB>3</SUB>O<SUB>7</SUB> nanowires are characterized using XRD, TEM, XPS, ultraviolet–visible spectroscopy, and photoluminescence spectroscopy. The results show that Pd-incorporated H<SUB>2</SUB>Ti<SUB>3</SUB>O<SUB>7</SUB> nanowires are formed and that the photocatalytic properties of the H<SUB>2</SUB>Ti<SUB>3</SUB>O<SUB>7</SUB> nanowires are improved by the doping and deposition processes. Furthermore, 1 wt% Pd/H<SUB>2</SUB>Ti<SUB>3</SUB>O<SUB>7</SUB> composite nanowires show a high hydrogen production rate (up to 0.31 mol min<SUP>−1</SUP>) under visible light illumination at 20 °C, and the efficiency of 0.25 wt% Pd/H<SUB>2</SUB>Ti<SUB>3</SUB>O<SUB>7</SUB> composite nanowires is enhanced by 20% under visible light illumination. The detailed mechanism of hydrogen production through hydrolysis of ammonia borane by using Pd/H<SUB>2</SUB>Ti<SUB>3</SUB>O<SUB>7</SUB> composite nanowires is discussed.</P> <P><B>Highlights</B></P> <P> <UL> <LI> Pd/H<SUB>2</SUB>Ti<SUB>3</SUB>O<SUB>7</SUB> was synthesized by one-step procedure. </LI> <LI> The band gap was shifted through Pd-doped, leading to the visible light response. </LI> <LI> Pd/H<SUB>2</SUB>Ti<SUB>3</SUB>O<SUB>7</SUB> revealed good visible light-driven photocatalytic activity. </LI> <LI> The enhancement of H<SUB>2</SUB> production rate could be assigned to the surface synergism. </LI> </UL> </P> <P><B>Graphical abstract</B></P> <P>[DISPLAY OMISSION]</P>
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Hong Chang Tan,Matthew Zhen-Wei Tan,Kwang Wei Tham,Shanker Pasupathy,Alvin Kim Hock Eng,Sonali Ganguly,Oi Fah Lai,Alvin Choong Meng Ng 대한골다공증학회 2015 Osteoporosis and Sarcopenia Vol.1 No.2
Objectives: Bone loss after bariatric surgery is well recognized but the best method for quantifying bone mineral density (BMD) remains controversial. BMD measured with dual energy X-ray absorptiometry (DXA) is prone to measurement errors in this population while quantitative computed tomography (QCT) is less affected. We report the skeletal changes after bariatric surgery at 1-year in a multi-ethnic Asian cohort using both central DXA and QCT. Methods: Areal BMD (aBMD) and volumetric BMD (vBMD) of twenty-two participants (mean age 40.6; female 59%) undergoing sleeve gastrectomy (n ¼ 12) or gastric bypass (n ¼ 10) were measured with central DXA and QCT respectively before and 12-months after surgery. Results: Weight and BMI decreased significantly but discordant QCT and DXA results were noted. aBMD was significantly reduced at the total hip (TH) and femoral neck (FN) by 6.9 and 8.5% respectively but was not significantly different at the lumbar spine (LS). By contrast, there were no significant changes in vBMD at TH and FN. Instead, a significant 11.2% decrease in vBMD was noted at the LS. These findings were largely similar between the two surgical subgroups. Interestingly, cortical vBMD increased at both TH and FN while trabecular vBMD decreased at the TH. These changes were observed despite no significant post-operative changes in serum calcium, iPTH or 25-OH vitamin D levels. Conclusion: Technical or physiological factors may be involved in the discordance between QCT and DXA results during short-term follow-up and the most suitable method of bone density measurement for post-bariatric surgery patients remains uncertain. © 2015 The Korean Society of Osteoporosis. Production and hosting by Elsevier B.V. This is an open access article under the CC BY-NC-ND license (http://creativecommons.org/licenses/by-nc-nd/4.0/).
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Lai, Shen,Byeon, Seongjae,Jang, Sung Kyu,Lee, Juho,Lee, Byoung Hun,Park, Jin-Hong,Kim, Yong-Hoon,Lee, Sungjoo The Royal Society of Chemistry 2018 Nanoscale Vol.10 No.39
<P>While preparing uniform dielectric layers on two-dimensional (2D) materials is a key device architecture requirement to achieve next-generation 2D devices, conventional deposition or transfer approaches have been so far limited by their high cost, fabrication complexity, and especially poor dielectric/2D material interface quality. Here, we demonstrate that HfO2, a high-K dielectric, can be prepared on the top surface of 2D HfS2 through plasma oxidation, which results in a heterostructure composed of a 2D van der Waals semiconductor and its insulating native oxide. A highly uniform dielectric layer with a controlled thickness can be prepared; the possibility of unlimited layer-by-layer oxidation further differentiates our work from previous attempts on other 2D semiconducting materials, which exhibit self-limited oxidation up to only a few layers. High resolution transmission electron microscopy was used to show that the converted HfO2/HfS2 hybrid structure is of high quality with an atomically abrupt, impurity- and defect-free interface. Density functional theory calculations show that the unlimited layer-by-layer oxidation occurs because oxygen atoms can barrierlessly penetrate into the HfS2 surface and the extracted sulfur atoms are absorbed into the oxygen vacancy sites within HfO2 under O-rich conditions. A top-gated field-effect transistor fabricated with the converted HfO2/HfS2 hybrid structure was found to exhibit a low interface trap density <I>D</I>it of 6 × 10<SUP>11</SUP> cm<SUP>−2</SUP> eV<SUP>−1</SUP> between the HfS2 channel and the converted HfO2 dielectric, and a high on/off current ratio above 10<SUP>7</SUP>. Our approach provides a low cost, simple, and ultraclean manufacturing technique for integrating 2D material into device applications.</P>
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