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( Yan Chen ),( Qiao Yu ),( Francis A. Farraye ),( Gursimran S. Kochhar ),( Charles N. Bernstein ),( Udayakumar Navaneethan ),( Kaicun Wu ),( Jie Zhong ),( David A. Schwartz ),( Hao Wu ),( Jing-jing Zh 대한장연구학회 2021 Intestinal Research Vol.19 No.3
Background/Aims: Performance of diagnostic or therapeutic endoscopic procedures in inflammatory bowel disease (IBD) patients can be challenging during a viral pandemic; the main concerns being the safety and protection of patients and health care providers (HCP). The aim of this study is to identify endoscopic practice patterns and outcomes of IBD and coronavirus disease 19 (COVID-19) with a worldwide survey of HCP. Methods: The 20-item survey questionnaire was sent to physician members of the American Society for Gastrointestinal Endoscopy Special Interest Group in Interventional IBD, Chinese IBD Society Endoscopy Interest Group, and the China Crohn’s and Colitis Foundation. Results: A total of 141 respondents submitted valid responses. Nighty-five respondents (67.9%) reported that at least 25% of their scheduled emergent endoscopic procedures were canceled or postponed during the pandemic. Fifty-six respondents (40.0%) have performed emergent endoscopy during the pandemic. A few respondents (9/140, 6.4%) estimated that more than 25% of their patients had worsened disease due to delayed or canceled emergent endoscopy procedures. More than 80% of respondents believed that personal protective equipment (PPE) for the endoscopy team, room sterilization, and pre-procedure screening of patients for COVID-19 were necessary. Out of 140 respondents, 16 (11.4%) reported that several of their patients had COVID-19. Eight clinicians (5.7%) reported that they or their endoscopy colleagues developed work-related COVID-19. Conclusions: Cancellation of elective and emergent endoscopy in IBD care during the pandemic was common. Few respondents reported that their patients’ disease conditions worsened due to the cancellation of the endoscopy procedure. Most respondents voiced the need for proper PPE during the procedure regardless of patients’ COVID-19 status and screening the patients for COVID-19. (Intest Res 2021;19:332-340)
Udayakumar Navaneethan,Norma G. Gutierrez,Ramprasad Jegadeesan,Preethi GK Venkatesh,Earl Poptic,Madhusudhan R. Sanaka,John J. Vargo,Mansour A. Parsi 대한소화기내시경학회 2014 Clinical Endoscopy Vol.47 No.6
Background/Aims: Immunoglobulin G4 (IgG4)-associated cholangiopathy (IAC) is an inflammatory disease and may mimic primary sclerosing cholangitis (PSC), cholangiocarcinoma (CCA), or pancreatic cancer on cholangiography. We investigated whether IgG4 levels in bile aspirated during endoscopic retrograde cholangiopancreatography (ERCP) can distinguish IAC from PSC, CCA, and pancreatic cancer. Methods: Bile was aspirated directly from the common bile duct during ERCP in patients with IAC prior to steroid therapy. For control purposes, bile was obtained from patients with PSC, CCA, pancreatic cancer, and benign biliary conditions (sphincter of oddi dysfunction/choledocholithiasis). Results: Biliary IgG4 levels were measured in 54 patients. The median bile IgG4 levels were markedly elevated in patients with IAC (5.5 mg/dL; interquartile range [IQR], 5.1 to 15.6) as compared to patients with benign biliary conditions (0 mg/dL; IQR, 0 to 0.1; p=0.003). The median biliary IgG4 levels in PSC, CCA, and pancreatic cancer were 1.2 (IQR, 0.2 to 3.8), 0.9 (IQR, 0.2 to 3.4), and 0.2 mg/dL (IQR, 0.1 to 0.8), respectively. A cutoff value of 3.8 mg/dL distinguished IAC from PSC and CCA patients with 100% and 76.9% sensitivity and specificity, respectively. Conclusions: The results of this pilot study suggest that measurement of biliary IgG4 levels may have clinical value in distinguishing patients with IAC from biliary disorders that can mimic IAC.
Mala S.,Latha H. K. E.,Udayakumar A. 한국물리학회 2023 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.83 No.3
This paper presents an efect of annealing temperature on microstructure and electrical properties of TiW contact flms deposited on ITO thin flm at a room temperature using DC magnetron sputtering system. As-deposited TiW contact flms are annealed at 200, 400 and 600 °C under vacuum environment. The microstructural properties are investigated using XRD, SEM and AFM. The electrical characteristics are characterized by linear transmission line method (L-TLM). The SEM and XRD investigations show that the TiW contact flm is composed of circular grains, and the crystals within the flm are oriented in either the (110) or (200) direction. An increase in grain size is observed on annealed TiW contact flms compared to as-deposited flms as investigated from SEM and AFM analysis. Annealing TiW contact flms at 600 °C improves their ohmic properties, reducing surface roughness and resulting in a specifc contact resistance of 6.25× 10−2 Ω cm2 at room temperature. These contacts are suitable for high-temperature sensor applications.
Manjushree S. G.,Adarakatti Prashanth S.,Udayakumar Velu,Almalki Abdulraheem S. A. 한국탄소학회 2022 Carbon Letters Vol.32 No.2
Cerium oxide decorated on nickel hydroxide anchored on reduced graphene oxide (Ce-Ni(OH)2/rGO) composite with hexagonal structures were synthesized by facile hydrothermal method. Fourier transform infrared spectroscopy (FT-IR), high-resolution transmission electron microscopy with selected area diffraction (HRTEM-SAED), scanning electron microscopy (SEM), energy dispersive spectroscopy (EDS), X-ray diffraction (XRD), X-ray photoelectron spectroscopy (XPS), Brunauer–Emmett–Teller (BET) surface area analysis and electrochemical technology were used to characterize the composite. Due to its unique two-dimensional structures and synergistic effect among Ce2O3, Ni(OH)2 and rGO components indicated two-dimensional hexagonal nano Ce-Ni(OH)2/rGO composite is promising electrode material for improved electrochemical H2O2 sensing application. From 50 to 800 µM, the H2O2 concentration was linearly proportional to the oxidation current, with a lower detection of limit of 10.5 µM (S/N = 3). The sensor has a higher sensitivity of 0.625 μA μM−1 cm−2. In addition, the sensor demonstrated high selectivity, repeatability and stability. These findings proved the viability of the synthetic method and the potential of the composites as a H2O2 sensing option.
Sujitha D.,Kumar H. G. Jalendra,Thapliayal Garima,Pal Garima,Vanitha P. A.,Uttarkar Akshay,Patil Mahesh,Reddy B. H. Rajashekar,Niranjan Vidya,Rayalcheruvu Usha,Govind Geetha,Udayakumar M.,Vemanna Ramu 한국식물생명공학회 2023 Plant biotechnology reports Vol.17 No.6
Reactive oxygen species (ROS) increases under stress and damages cellular processes leading to decrease in productivity. Many genes have been known to be involved in scavenging ROS. We report the identification of master regulators of oxidative stress responsive genes from contrasting rice genotypes. Using microarray analysis, we identified 52 differentially expressed transcription factors (TFs) from the contrasting rice genotypes under oxidative stress. Upregulation of these TFs induces the expression of many genes in resistant or sensitive genotypes. The promoters of these TFs are enriched with reactive oxygen species binding elements (ROSE). The promoter analysis of genes that respond to oxidative stress also revealed that these TF binding sites were present and that these genes expressed differently in contrasting rice genotypes. The transcript levels of TFs correlate with expression level of stress responsive genes coding for various pathways such as polyol, ABA, JA biosynthesis and signaling. Functional validation of HSF-C1a using virus-induced gene silencing (VIGS), showed reduced expression of its target genes. Our study demonstrates that identified TFs could act as major transcriptional regulators of oxidative stress tolerance. These TFs can be used as markers and are potential candidates to improve stress tolerance in plants.