Publish in OALib Journal

ISSN: 2333-9721

APC: Only $99


Any time

2020 ( 12 )

2019 ( 101 )

2018 ( 771 )

2017 ( 752 )

Custom range...

Search Results: 1 - 10 of 50343 matches for " Chun-Yan Yeung "
All listed articles are free for downloading (OA Articles)
Page 1 /50343
Display every page Item
4-{(E)-N′-[2-(8-Quinolyloxy)acetyl]hydrazonomethyl}benzoic acid methanol solvate
Chun-Yan Ren
Acta Crystallographica Section E , 2009, DOI: 10.1107/s1600536809021576
Abstract: In the title compound, C19H15N3O4·CH4O, the mean planes of the benzene ring and the quinoline system make a dihedral angle of 6.7 (2)°. The acetohydrazide host molecules are connected via intermolecular O—H...O hydrogen bonds into two-dimensional zigzag sheets extending in the ab plane. The methanol solvent molecule is linked to the host molecule via intermolecular N—H...O and O—H...N hydrogen bonds.
(E)-N′-(4-Nitrobenzylidene)-2-(8-quinolyloxy)acetohydrazide methanol solvate
Chun-Yan Ren
Acta Crystallographica Section E , 2009, DOI: 10.1107/s1600536809015992
Abstract: In the title compound, C18H14N4O4·CH3OH, the mean planes of the benzene ring and the quinoline ring system make a dihedral angle of 15.5 (2)°. The methanol solvent molecule forms an O—H...N hydrogen bond to the quinoline ring system and accepts an N—H...O hydrogen bond from the hydrazide NH group. The molecules lie in layers approximately parallel to (101) and C—H...O interactions exist between molecules within the layers.
Chun-yan Ren
Acta Crystallographica Section E , 2009, DOI: 10.1107/s1600536809007272
Abstract: The title Schiff base compound, C13H8Cl3N3O2, was synthesized by the condensation reaction of 3,5-dichlorosalicylaldehyde with 6-chloronicotinic acid hydrazide in 95% ethanol. The molecule is nearly planar, with a dihedral angle of 1.9 (2)° between the aromatic ring planes, and an intramolecular O—H...N hydrogen bond is observed. In the crystal, the molecules are connected by intermolecular N—H...O hydrogen bonds into infinite chains propagating in [100].
Effects of Liangxue Tongyu Formula on brain edema and expressions of matrix metalloproteinase-9 and tissue inhibitor of metalloproteinase-1 in rats with intracerebral hemorrhage
Chun-yan HE
Zhong Xi Yi Jie He Xue Bao , 2010,
Abstract: Objective: To investigate the effects of Liangxue Tongyu Formula (LXTYF), a compound traditional Chinese herbal medicine, on brain edema in rats with intracerebral hemorrhage and to explore the mechanism. Methods: Intracerebral hemorrhage was induced by using the intrastriatal autologous blood injection. Rats were randomized into sham-operated (SO) group, intracerebral hemorrhage (ICH) group and LXTYF group. Rats in the LXTYF group were intragastrically administered with LXTYF every day while the other two groups were given normal saline. Brain water content was determined at 24, 48, 72, and 120 h after intracerebral hemorrhage. Matrix metalloproteinase-9 (MMP-9) level, and MMP-9 and tissue inhibitor of metalloproteinase-1 (TIMP-1) mRNA expressions in perihematoma area were detected by gelatin zymography and fluorescence quantitative real-time polymerase chain reaction at the four time points, respectively. Results: Water content in the ICH group was highly elevated after intracerebral hemorrhage, and reached to the peak at 72 h. Compared with the ICH group, the LXTYF group had lower water contents at 48, 72 and 120 h after intracerebral hemorrhage (P<0.01). The difference in water content between the LXTYF and SO groups was significant only at 72 h (P<0.01). Although the pro-MMP-9 level and MMP-9 activity in the LXTYF and ICH groups were enhanced, they were still lower in the LXTYF group than in the ICH group (P<0.01 for 24, 48, 72 and 120 h, respectively). And there was no significant difference in them between the LXTYF group and the SO group at 120 h. Meanwhile, MMP-9 mRNA expressions were increased in the ICH and LXTYF groups, but the levels in the LXTYF group were significantly lower (P<0.01 for 48, 72 and 120 h, respectively) than those in the ICH group. Also, TIMP-1 mRNA expressions at 24, 48, 72 and 120 h after intracerebral hemorrhage were up-regulated in the LXTYF group, and there were significant differences in TIMP-1 expressions between the LXTYF group and ICH group after intracerebral hemorrhage (P<0.01). Conclusion: Liangxue Tongyu Formula ameliorates brain edema in rats after intracerebral hemorrhage by inhibiting MMP-9 expression and activity and up-regulating TIMP-1.
Clinical research of Yiqi Sanju Formula in treating central obese men at high risk of metabolic syndrome
Chun-yan HE
Zhong Xi Yi Jie He Xue Bao , 2007,
Abstract: Objective: To observe the therapeutic effects of Yiqi Sanju Formula (YQSJF), a compound Chinese herbal medicine, on central obese men at high risk of metabolic syndrome (MS).Methods: Compared with 30 healthy male volunteers, 45 central obese men were separated randomly into two groups and received the interventions with YQSJF and placebo respectively for 10 weeks. Baseline characteristics, insulin resistance, inflammation cytokines and plasminogen activator inhibitor-1 (PAI-1) and tissue plasminogen activator (t-PA) were evaluated before and after treatment. Results: The score of homeostatic model assessment for insulin resistance (HOMA-IR) and the levels of C reactive protein (CRP), free fatty acid (FFA) and PAI-1 in obese men were higher than those in the control group, while t-PA was lower. After treatment, compared with placebo group, body mass index, waist, and waist-to-hip ratio were decreased significantly in subjects who received YQSJF (P<0.01). The score of HOMA-IR and the levels of CRP, FFA and PAI-1 were decreased significantly, and the level of t-PA was increased significantly (P<0.01). Conclusion: YQSJF can reduce obesity and insulin resistance in central obese men at high risk of MS and improve inflammation and fibrinolysis, which indicates that it can reduce the risk of atherosclerosis.
Determination of catalpol in dried rehmannia root and Taohong Siwu Decoction with high performance liquid chromatography
GUO Chun-Yan
Zhong Xi Yi Jie He Xue Bao , 2004,
Abstract: Objective: To determinate the catalpol contents in dried rehmannia root and Taohong Siwu Decoction containing rehmannia root with high performance liquid chromatography (HPLC). Methods: Catalpol was separated on a YWG-C18 column using water-acetonitrile (99.4∶0.6) as mobile phase and detective wavelength at 210 nm. Results: The linear curve of tested catalpol concentration within the range of 0.0536-5.3600 μg/μl was ideal (n=5, r=0.9997). The average recovery rate of the dried rehmannia root and Taohong Siwu decoction was 98.7% (RSD=0.48%) and 98.2% (RSD=1.29%) respectively. Conclusion: HPLC method is accurate and valuable for the quality control of Radix Rehmanniae and Taohong Siwu Decoction.
Meckel’s Diverticulum: Factors Associated with Clinical Manifestations
Jeng-Jung Chen,Hung-Chang Lee,Chun-Yan Yeung,Wai-Tao Chan,Chuen-Bin Jiang,Jin-Cherng Sheu,Nein-Lu Wang
ISRN Gastroenterology , 2014, DOI: 10.1155/2014/390869
Abstract: Objectives. The purpose of this study was to investigate the clinical features of Meckel’s diverticula at different ages, genders, and pathology in order to serve as a reminder to clinicians when evaluating potential cases and to help obtain an early diagnosis. Methods. We collected information of patients with Meckel’s diverticulum diagnosed at Mackay Memorial Hospital in Taiwan from 1984 to 2009. After performing a thorough review of their charts, the clinical features of the Meckel’s diverticula were analyzed according to age groups, gender, and pathology. Result. A total of 126 patients, with 90 males and 36 females, were enrolled in this study. Seventy-five patients were symptomatic and 51 Meckel’s diverticula were found incidentally during surgery for other diseases. Among symptomatic patients, 39% of pediatric patients and 5% of adult patients had intestinal hemorrhage. Twenty-eight percent of pediatric patients and 67% of adult patients had inflammation of Meckel’s diverticulum. Forty-six percent of males and 16% of females had inflammation. Conversely, 27% of males and 58% percent of females had intestinal obstruction. When Meckel’s diverticulum had ectopic gastric mucosa, it tended to cause intestinal hemorrhage when the patient is young. Conclusions. Age, gender, and pathology affect the clinical presentations of Meckel’s diverticula. 1. Introduction Meckel’s diverticulum (MD) is the most common congenital anomaly of the gastrointestinal tract. It was first described in 1809 [1]. MD is a remnant of the omphalomesenteric or vitelline duct [2, 3]. The prevalence ranges from 2 to 4%. Anatomically, MD is a true diverticulum containing all layers of the small intestine, arising from the antimesenteric border of the ileum and receiving its blood supply from a remnant of the vitelline artery [4]. MD involves a variety of complications, including intestinal obstruction, intussusceptions, ulceration, hemorrhage, vesico-diverticular fistulae, and tumors [4–8]. The incidence of complications differed between different articles, which analyzed only adults or pediatric populations [2, 8–11]. The purpose of this study was to investigate the clinical features of MD at different ages and genders in order to serve as a reminder to clinicians when evaluating potential cases and to help obtain an early diagnosis. 2. Methods 2.1. Patients and Medical Records We retrospectively reviewed the charts of all patients with MD who were managed at Mackay Memorial Hospital in Taiwan from 1984 to 2009. The diagnosis of MD was made according to surgical and pathologic
Study on Earth Surface Potential and DC Current Distribution around DC Grounding Electrode  [PDF]
Zhi-chao Ren, Chun-yan Ye, Hai-yan Wang
Energy and Power Engineering (EPE) , 2013, DOI: 10.4236/epe.2013.54B152

DC magnetic biasing problem,caused by the DC grounding electrode, threatened the safe operation of AC power grid. In this paper, the characteristics of the soil stratification near DC grounding electrode was researched. The AC-DC interconnected large-scale system model under the monopole operation mode was established. The earth surface potential and DC current distribution in various stations under the different surface thickness was calculated. Some useful conclusions are drawn from the analyzed results.

In Vitro Prevention of Salmonella Lipopolysaccharide-Induced Damages in Epithelial Barrier Function by Various Lactobacillus Strains
Chun-Yan Yeung,Jen-Shiu Chiang Chiau,Wai-Tao Chan,Chun-Bin Jiang,Mei-Lien Cheng,Hsuan-Liang Liu,Hung-Chang Lee
Gastroenterology Research and Practice , 2013, DOI: 10.1155/2013/973209
Abstract: Background. Lactobacillus shows beneficial anti-inflammatory effects on Salmonella infection. The maintenance of the tight junction (TJ) integrity plays an importance role in avoiding bacterial invasion. Whether Lactobacillus could be used to regulate the TJ protein expression and distribution in inflamed intestinal epithelial cells was determined. Methods. Using the transwell coculture model, Salmonella lipopolysaccharide (LPS) was apically added to polarized Caco-2 cells cocultured with peripheral blood mononuclear cells in the basolateral compartment. LPS-stimulated Caco-2 cells were incubated with various Lactobacillus strains. TJ integrity was determined by measuring transepithelial electrical resistance across Caco-2 monolayer. Expression and localization of TJ proteins (zonula-occludens- (ZO-) 1) were determined by Western blot and immunofluorescence microscopy. Results. Various strains of Lactobacillus were responsible for the different modulations of cell layer integrity. LPS was specifically able to disrupt epithelial barrier and change the location of ZO-1. Our data demonstrate that Lactobacillus could attenuate the barrier disruption of intestinal epithelial cells caused by Salmonella LPS administration. We showed that Lactobacillus strains are associated with the maintenance of the tight junction integrity and appearance. Conclusion. In this study we provide insight that live probiotics could improve epithelial barrier properties and this may explain the potential mechanism behind their beneficial effect in vivo. 1. Introduction Salmonella infection is a common cause of human food poisoning worldwide and can induce a broad spectrum of diseases from mild diarrhea to typhoid. All Salmonella serotypes share the ability to gain entry to the host through oral ingestion of contaminated food or water. They induce their own uptake into intestinal epithelial by Salmonella pathogenicity island-1 (SPI-1) type 3 secretion system. This epithelial barrier function can be further weakened by infection with bacteria, including S. typhimurium effectors [1, 2]. Salmonella enterica serovar Typhimurium has developed means of breaching the mucosal epithelial barrier by usurping signaling mechanisms within host cells [3]. It is likely that Salmonella induces localized effects on tight junction permeability during intestinal infections. These effects may act synergistically with other conditions, such as inflammatory responses, to promote tight junction (TJ) dysfunction [4]. At present, S. typhimurium overcoming the intestinal barrier is the most widely accepted
Analytical solutions to the electromagnetic field in a cylindrical shell excited by external axial current

Wu Jing,Xiao Chun-Yan,

中国物理 B , 2010,
Abstract: The solutions to the electromagnetic field excited by a long axial current outside a conductive and magnetic cylindrical shell of finite length are studied in this paper. The more accurate analytical solutions are obtained by solving the proper boundary value problems by the separation variable method. Then the solutions are simplified according to asymptotic formulas of Bessel functions. Compared with the accurate solutions, the simplified solutions do not contain the Bessel functions and the inverse operation of the singular matrix, and can be calculated out fast by computers. The simplified solutions are more suitable for the cylindrical shell of high permeability and conductivity excited by a high frequency source. Both of the numerical results and the physical experimental results validate the simplified solutions obtained.
Page 1 /50343
Display every page Item

Copyright © 2008-2017 Open Access Library. All rights reserved.