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이재익,윤일국,이종선,김종완,장준,안정기,송민호,정현용,이헌영,김삼용,김영건 충남대학교 암연구소 1991 癌共同硏究所 硏究誌 Vol.1 No.1
We performed a variety of lymphocyte stimulation tests, delayed hypersensitivity skin tests, and enumeration of several lymphocyte subpopulations in 21 patients with gastric cancer who did not receive any form of anticancer therapy, and in 20 healthy controls. The gastric cancer patients had significantly decreased number and total score of positive reactions in delayed hypersensitivity skin tests compared with the healthy controls. The percent of CD_(4) positive lymphocytes in the gastric cancer patients was significantly decreased compared to the normal control subjects, but it had no correlation with the total score of delayed cutaneous hypersensitivity reactions. The ratio of helper to suppressor cells was lower in the cancer group. The uptake of 3H-thymidine was markedly depressed in cancer patients when stimulated with various mitogens. There was little correlation between any of the stimulation tests and any of the lymphocyte subpopulation proportions to delayed hypersensitivity cutaneous reactions. Optimal proliferative response was found in lymphocytes stimulated with 10 micrograms of concanavalin-A and 10 microgram of phytohemagglutinin. Advanced stage patients had greatly depressed delayed hypersensitivity skin reactions and proliferative responses to mitogens compared with localized diseases. These results suggest that gastric cancer patients have depressed cellular immune functions, which mainly result from the decreased helper cells and defects in functional proliferative response to mitogens. Interleukin-2 and interferon-gamma restored the in vitro proliferative response of lymphocyte in patients with gastric cancer.
The effect of metal work function on the barrier height of metal/CdS/SnO2/In–Ga structures
Ilke Taşçıoğlu,S¸ emsettin Altındal,İsmail Polat,Emin Bacaksız 한국물리학회 2013 Current Applied Physics Vol.13 No.7
In order to interpret the effect of metal work function on the formation of the barrier height at metal/semiconductor (M/S) interface, the CdS/SnO2/IneGa structures with several metals (Ag, Au, Al, Te) have been investigated by using IeV characteristics at room temperature. The main electrical parameters such as ideality factor (n), zero-bias barrier height (FBo), series resistance (Rs) have been determined and compared with each other. The values of n were found to be 3.00, 2.56, 3.83, and 3.31 for Al, Ag, Te, and Au/CdS/SnO2/IneGa structures, respectively. The values of FBo were also found to be 0.489 eV, 0.490 eV,0.583 eV, 0.591 eV for Al, Ag, Te, and Au/CdS/SnO2/IneGa structures, respectively. The FBo dependence on the metal work function (Fm) was found to vary almost linearly as FBo = 0.106Fm þ 0.028. The low value of the slope S (dFB/dFM y 0.106) shows a weak relationship between FBo and Fm due to serious Fermilevel pinning in the conduction band. In addition, the IeV plots have a rectifying behavior. The rectification ratio, defined by the ratio of forward to reverse current (RR = IF/IR) measured at the same absolute bias, was found as 11.96, 20.88, 35.82, and 75.61 for Al, Ag, Te, Au/CdS/SnO2/IneGa diodes, respectively. In addition, the values of Rs were determined from Ohm’s Law and Norde’s method. Analysis of IeV characteristics confirm that using of different metal (Al, Ag, Te, Au) has significant effect on electrical parameters of such devices.
The impact of air contaminants on humidifier membrane performance
Daniel Ilk,Viktoria Frick,Christopher Hänel,Thomas Schiestel,Michael Schoemaker,Holger Kraus,Harry E. Hoster 한국공업화학회 2023 Journal of Industrial and Engineering Chemistry Vol.126 No.-
Membrane humidifiers are often used to increase the performance and lifetime of polymer electrolytemembrane fuel cells (PEMFC). In order to avoid possible problems and consequential costs in later fuelcell applications due to the degradation of humidifier membranes, in this work five industrial humidifiermembranes (hollow fiber and flat sheet membranes in various material combinations) are tested againstfive pollutant gases from the environment (NO, NO2, NH3, SO2, O3). Herefor the water transfer capabilitiesbefore and after exposure to the pollutant gases is quantified. The results show that polyimides and fluoropolymersare degraded by ozone so that mechanical stability drastically decreases, so that they disintegrate. When polysulfone membranes are tested with pollutants a clear decline in water transfer can beseen over time. The decline of water transfer does not always seem to be due to the presence of harmfulgases but could also reflect physical degradation of the polymer. Perfluorinated sulfonic acid-based(PFSA) membranes are particularly sensitive to ammonia.
Use of sugammadex in Rett syndrome: A case report
Kupeli, Ilke,Tepe, Emine,Kuyrukluyildiz, Ufuk The Korean Dental Society of Anesthsiology 2018 Journal of Dental Anesthesia and Pain Medicine Vol.18 No.4
Rett syndrome (RS) is a neurodevelopmental disorder characterized by loss of cognitive, motor, and social skills, epilepsy, autistic behavior, abnormal airway patterns, gastroesophageal reflux, nutritional problems, and severe scoliosis. Although girls with RS show normal or near-normal growth until 6-8 months, they lose their skills after that. The anesthetic management of these patients requires care because of all these clinical features. Especially in the postoperative period, prolonged apnea is common and extubation is delayed. In this case report, the effect of using sugammadex was presented in a 16-year-old girl with RS. The patient's all bimaxillary teeth and 4 wisdom teeth were extracted under general anesthesia in one session with minimal surgical trauma and moderate bleeding. Sugammadex can be a rapid and reliable agent for the reversal of the neuromuscular block in neurodegenerative patients.
Antioxidative and antiproliferative effects of propolis-reduced silver nanoparticles
Tan, Gamze,Ilk, Sedef,Foto, Fatma Z.,Foto, Egemen,Saglam, Necdet Techno-Press 2021 Advances in nano research Vol.10 No.2
In this study, phytochemicals present in Propolis Extract (PE) were employed as reducing and stabilizing reagents to synthesize silver nanoparticles. Three propolis-reduced silver nanoparticles (P-AgNPs1-3) were synthesized using increasing amounts of PE. P-AgNPs were treated with different cancer cells-lung (A549), cervix (HeLa) and colon (WiDr) - for 24, 48 and 72 h to evaluate their anti-proliferative activities. A non-cancerous cell type (L929) was also used to test whether suppressive effects of P-AgNPs on cancer cell proliferation were due to a general cytotoxic effect. The characterization results showed that the bioactive contents in propolis successfully induced particle formation. As the amount of PE increased, the particle size decreased; however, the size distribution range expanded. The antioxidant capacity of the particles increased with increased propolis amounts. P-AgNP1 exhibited almost equal inhibitory effects across all cancer cell types; however, P-AgNP2 was more effective on HeLa cells. P-AgNPs3 showed greater inhibitory effects in almost all cancer cells compared to other NPs and pure propolis. Consequently, the biological effects of P-AgNPs were highly dependent on PE amount, NP concentration, and cell type. These results suggest that AgNPs synthesized utilizing propolis phytochemicals might serve as anti-cancer agents, providing greater efficacy against cancer cells.
Martens Katleen,De Boeck Ilke,Jokicevic Katarina,Kiekens Filip,Farré Ricard,Vanderveken Olivier M.,Seys Sven F.,Lebeer Sarah,Hellings Peter W.,Steelant Brecht 대한천식알레르기학회 2021 Allergy, Asthma & Immunology Research Vol.13 No.4
Purpose A defective epithelial barrier has been demonstrated in chronic rhinosinusitis with nasal polyps (CRSwNP). Lactobacilli are shown to restore epithelial barrier defects in gastrointestinal disorders, but their effect on the airway epithelial barrier is unknown. In this study, hence, we evaluated whether the nasopharyngeal isolates Lacticaseibacillus casei AMBR2 and Latilactobacillus sakei AMBR8 could restore nasal epithelial barrier integrity in CRSwNP. Methods Ex vivo trans-epithelial tissue resistance and fluorescein isothiocyanate-dextran 4 kDa (FD4) permeability of nasal mucosal explants were measured. The relative abundance of lactobacilli in the maxillary sinus of CRSwNP patients was analyzed by amplicon sequencing of the V4 region of the 16S rRNA gene. The effect of spray-dried L. casei AMBR2 and L. sakei AMBR8 on epithelial integrity was investigated in vitro in primary nasal epithelial cells (pNECs) from healthy controls and patients with CRSwNP as well as in vivo in a murine model of interleukin (IL)-4 induced barrier dysfunction. The activation of Toll-like receptor 2 (TLR2) was explored in vitro by using polyclonal antibodies. Results Patients with CRSwNP had a defective epithelial barrier which positively correlated with the relative abundance of lactobacilli-specific amplicons in the maxillary sinus. L. casei AMBR2, but not L. sakei AMBR8, increased the trans-epithelial electrical resistance (TEER) of pNECs from CRSwNP patients in a time-dependent manner. Treatment of epithelial cells with L. casei AMBR2 promoted the tight junction proteins occludin and zonula occludens-1 reorganization. Furthermore, L. casei AMBR2 prevented IL-4-induced nasal permeability in vivo and in vitro. Finally, the beneficial effect of L. casei AMBR2 on nasal epithelial cells in vitro was TLR2-dependent as blocking TLR2 receptors prevented the increase in TEER. Conclusions A defective epithelial barrier in CRSwNP may be associated with a decrease in relative abundance of lactobacilli-specific amplicons. L. casei AMBR2 would restore nasal epithelial integrity and can be a novel therapeutic strategy for CRSwNP.