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29 results on '"G. Gursoy"'

1. ESTIMATIONS OF HEAT CAPACITIES FOR ACTINIDE DIOXIDE: UO2, NpO2, ThO2, AND PuO2

Author

E. ESER, H. KOC, M. GOKBULUT, and G. GURSOY

Subjects
Nuclear Fuels, Minor Actinide, Temperature Dependence, Uranium Dioxide, Debye Functions, Nuclear engineering. Atomic power, TK9001-9401
Abstract

The evaluation of thermal properties of actinide oxide fuels is a problem of high importance for the development of new generation reactors. In the present study, an expression obtained for n-dimensional Debye functions is used to derive a simple analytical expression for the specific heat capacity of nuclear fuels. To test the validity and reliability of this expression, the analytical expression is applied to UO2, NpO2, ThO2, and PuO2. It is seen that the formula was in agreement with the experimental and theoretical results reported in the literature.

Published
2014
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2. Effect of individualized cognitive and postural task difficulty levels on postural control during dual task condition

Author

Zeren G. Gursoy, Ugur Yilmaz, Huseyin Celik, Pinar Arpinar-Avsar, and Sadettin Kirazci

Subjects
Male, Cognition, Rehabilitation, Biophysics, Humans, Female, Orthopedics and Sports Medicine, Postural Balance, Healthy Volunteers
Abstract

Previous dual task studies suggested that the difficulty of the concurrent cognitive and motor tasks may not be challenging to the same degree for each person. This study approaches this problem by setting individualized difficulty levels for tasks to examine the dual task interference.Do the features of postural sway depend on increased individualized difficulty levels of concurrent cognitive and postural activities?20 young healthy participants (10 male, 10 female) took part in the study. Before the experiments, cognitive task difficulty (No-, Medium-, High) has been set individually. Subjects performed postural tasks (quiet stance, voluntary sway) concurrently with or without a cognitive task which based on simple arithmetic calculations. Postural sway features were examined.Postural sway features were affected by individualized difficulty level of concurrent cognitive and postural activities. In voluntary sway, as a more challenging postural task, higher reductions were observed for such sway features as COP velocity and range in AP direction.This study signaled task-specific changes in postural sway features. When the difficulty levels were set individually, the effect of motor and cognitive dual task was more apparent when the balance requirement of the primary motor task increased.

Published
2022
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3. Study on specific heat capacity and thermal conductivity of uranium nitride

Author

M. Gokbulut, G. Gursoy, Ş. Aşcı, and E. Eser

Subjects
Nuclear and High Energy Physics, Radiation, Nuclear Energy and Engineering, General Materials Science, Safety, Risk, Reliability and Quality
Abstract

In this study, we have proposed an analytical method for calculating the specific heat capacity of uranium nitride nuclear material. The specific heat capacity results have obtained by the use of the Debye-Einstein approximation. The thermal conductivity of nuclear material has been obtained by using the experimental data of thermal diffusivity and the calculation results of specific heat capacity. This method shows that our results are satisfactory for the wide range temperature variations. The proposed approach can be easily applied to determine the thermodynamic properties of the other nuclear materials.

Published
2021
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4. Determination of natural radioactivity levels in soil and travertine of the region of Tokat and Sivas, Turkey

Author

S. Kilicaslan, Erhan Eser, Hüseyin Koç, G. Gursoy, S. Yamcicier, I. Yigitoglu, B. Çetın, F. Öner, Iskender Akkurt, and Kırşehir Ahi Evran Üniversitesi, Sağlık Hizmetleri Meslek Yüksekokulu, Tıbbi Hizmetler ve Teknikler Bölümü

Subjects
Radionuclide, Soil test, Gamma spectrometer, chemistry.chemical_element, Hazard index, 010403 inorganic & nuclear chemistry, 01 natural sciences, 030218 nuclear medicine & medical imaging, 0104 chemical sciences, Radium, 03 medical and health sciences, 0302 clinical medicine, chemistry, Environmental chemistry, Natural radioactivity, Soil and travertine, General Earth and Planetary Sciences, Environmental radioactivity, Environmental science, Dose rate, Gamma ray spectrometry, General Environmental Science
Abstract

In this study, the environmental radioactivity measurements for Tokat and Sivas provinces in the northeast of Turkey were performed. Using gamma ray spectrometry, the activity concentrations of natural radionuclides in soil and travertine samples ( 232 Th, 226 Ra, and 40 K) were determined. The annual effective dose equivalent, the absorbed doses rate in air, the radium equivalent, and the external hazard index were obtained from these activities. The activity concentrations vary from 9.09 to 17.04 Bq kg ?1 for 232 Th, from 36.53 to 76.95 Bq kg ?1 for 226 Ra, and from 216.56 to 576.59 Bq kg ?1 for 40 K in soil samples. The activity concentrations in travertines vary from 15.99 to 21.01 Bq kg ?1 for 232 Th, from 19.89 to 67.71 Bq kg ?1 for 226 Ra, and from 179.89 to 314.43 Bq kg ?1 for 40 K. The average dose rate in air for soil and travertine samples was 43.41 and 41.05 nGy h ?1 respectively. The obtained results are presented and compared with other studies, and the results of this study are lower than the international recommended value (55 nGy h ?1 ) given by UNSCEAR (2000). The results show that the region has a background radiation level within the natural limits. © 2018, Saudi Society for Geosciences. Firat University Scientific Research Projects Management Unit British Association for Psychopharmacology: 24/2013 Funding information This work is supported by Gaziosmanpasa University Scientific Research Projects Department (BAP) under project no. 24/2013.

Published
2018

5. ESTIMATIONS OF HEAT CAPACITIES FOR ACTINIDE DIOXIDE: UO2, NpO2, ThO2, AND PuO2

Author

G. Gursoy, Erhan Eser, M. Gokbulut, Hüseyin Koç, and Kırşehir Ahi Evran Üniversitesi, Sağlık Hizmetleri Meslek Yüksekokulu, Tıbbi Hizmetler ve Teknikler Bölümü

Subjects
Chemistry, Uranium dioxide, Radiochemistry, Temperature Dependence, Thermodynamics, Minor actinide, Actinide, Expression (computer science), Heat capacity, Debye Functions, lcsh:TK9001-9401, Minor Actinide, symbols.namesake, chemistry.chemical_compound, Uranium Dioxide, Nuclear Energy and Engineering, Nuclear Fuels, symbols, lcsh:Nuclear engineering. Atomic power, Debye function, Physics::Chemical Physics, Energy source, Reliability (statistics)
Abstract

The evaluation of thermal properties of actinide oxide fuels is a problem of high importance for the development of new generation reactors. In the present study, an expression obtained for n-dimensional Debye functions is used to derive a simple analytical expression for the specific heat capacity of nuclear fuels. To test the validity and reliability of this expression, the analytical expression is applied to UO2, NpO2, ThO2, and PuO2. It is seen that the formula was in agreement with the experimental and theoretical results reported in the literature. © 2014, Korean Nuclear Society. All rights reserved.

Published
2014

6. Regeneration of Sulfated Dolomite and Limestone by Reductive Decomposition

Author

Sadriye Küçükbayrak, G. Gursoy, Nilgün Karatepe, Ayşegül Ersoy-Meriçboyu, and S. Kafa

Subjects
Sorbent, General Chemical Engineering, Dolomite, Energy Engineering and Power Technology, Mineralogy, law.invention, Flue-gas desulfurization, chemistry.chemical_compound, Fuel Technology, Adsorption, chemistry, law, Calcination, Reactivity (chemistry), Fluidized bed combustion, Sulfur dioxide, Nuclear chemistry
Abstract

Regeneration properties of sulfated dolomite and limestone samples were investigated. Natural stones were first fully calcined at 1223 K in a gaseous atmosphere consisting of CO{sub 2} 15 vol. % and dry air 85 vol. %; second, sulfation of the calcines was achieved by reacting them with a gaseous mixture consisting of CO{sub 2} 15 vol. %, SO{sub 2} 0.35 vol. %, and a balance of dry air at 1223 K; last, sulfated calcines were regenerated at 1373 K by a reductive decomposition process. During regeneration a 3:1 volumetric ratio of CO{sub 2}/CO was maintained in the reducing gaseous atmosphere to minimize CaS formation. It has been found that for the five sulfation-generation cycles the reactivity of the limestone and dolomite samples remained at acceptable levels. Since the repeated sulfation-regeneration steps caused an important change on the crystal lattice, as compared to the fresh stones, sorbent reactivity was also changed.

Published
1999
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7. Fourth meeting of the European Neurological Society 25–29 June 1994 Barcelona, Spain

Author

H. Hattig, C. Delli Pizzi, M. C. Addonizio, Michelle Davis, A. R. Giovagnoli, L. Florensa, M. Roth, J. de Kruijk, Francisco Lacruz, Ph. Dewailly, A. Toygar, C. Avendano, P.P. De Deyn, J. F. Hurtevent, F. Lomeila, T. W. Wong, Gordon T. Plant, M. Bud, H. J. Willison, DH Miller, D. W. Langdon, R. Cioni, J. Servan, A. Kaygisiz, E. Racadot, D. B. Schens, E. Picciola, L. Falip, C. Bouchard, J. Jotova, A. Jorge-Santamaria, P. Misra, A. Dufour, C. P. Panagopoulos, A. Venneri, B. Sredni, B. Angelard, M. Janelidze, M. Carreno, J. Obenberger, J. Pouget, H. W. Moser, R. Kaufmann, J. A. Molina, D. Linden, A. Martin Urda, E. Uvestad, A. Krone, J. P. Cochin, J. Mallecourt, A. Cambon-Thomsen, K. Violleau, P. Osschmann, A. M. Durocher, E. Bussaglia, D. M. Danielle, H. Efendi, C. Van Broeckhoven, K. G. Jordan, W. Rautenberg, C. Iniguez, J. M. Delgado, Graham Watson, M. Lawden, Gareth J. Barker, K. Stiasny, James T. Becker, G. Campanella, E. Peghi, A. Poli, A. Haddad, T. Yamawaki, Giacomo P. Comi, S. Sotgiu, B. Ersmark, A. Pomes, M. Ziegler, P. Ferrante, P. Ruppi, H. KuÇukoglu, R. Bouton, U. K. Rinne, P. Vieregge, M. Dary, P. Giunti, Peter J. Goadsby, S. Jung, E. Secor, A. Steinberg, N. Vila, M. A. Hernandez, M. Cursi, A. Enqelhardt, A. Engelhardt, J. Veitch, F. Di Silverio, F. Arnaud, B. Neundörfer, R. Brucher, Dominique Caparros-Lefebvre, B. Meyer, Marianne Dieterich, M. H. Snidaro, R. Gomez, R. Cerbo, M. Ragno, J. M. Vance, S. Nemni, A. Caliskan, F. Barros, I. Velcheva, D. Ceballos-Baumann, V. Barak, A. Avila, N. Antonova, F. Resche, S. Pappata, L. Varela, S. R. Silveira Santos, A. Cammarota, L. Naccache, Y. Nara, E. Tournier-Lasserves, R. Mobner, T. Chase, A. Ensenyat, J. Ulrich, G. Giegerich, M. Rother, M. Revilla, N. Nitschke, K. Honczarenko, E. Basart Tarrats, J. Blin, B. Jacob, J. Santamaria, S. Knezevic, J. L. Castillo, M. Antem, J. Colomer, O. Busse, Didier Hannequin, S. Carrier, J. B. Ruidavets, C. Rozman, J. Bogoussslavsky, J. Pascual Calvet, E. Monros, J. M. Polo, M. Zucconl, Javier Muruzabal, R. R. Allen, R. Rivolta, K. Haugaard, A. Nespolo, K. Hoang-Xuang, G. Bussone, T. Avramidis, E. Corsini, Christiana Franke, T. Vinogradova, H. Boot, K. Vestergaard, G. H. Jansen, N. Argentino, M. Raltzig, W. Linssen, Mark B. Pepys, P. Roblot, L. Lauritzen, E. Fainardi, D. Morin, T. X. Arbizu Urdiain, J. Wollenhaupt, S. Bostantjopoulou, G. Pavesi, A. D. Forman, Giovanni Fabbrini, D. Jean, J. J. Archelos, M. I. Blanchs, M. Del Gobbo, Anna Carla Turconi, Ch. Derouesné, Elio Scarpini, A. Visbeck, P. Castejon, J. P. Renou, F. Mounier-Vehier, G. Potagas, Ch. Duyckaerts, A. Filla, R. Schneider, G. Ronen, K. Nagata, J. P. Vedel, A. Henneberg, G. van Melle, C. Baratti, H. Knott, M. C. Prevett, A. Bes, B. Metin, Jos V. Reempts, L. Martorell, Mefkure Eraksoy, H. O. Handwerker, D. S. Younger, O. Oktem, D. Frongillo, C. Soriano-Soriano, L. Niehaus, F. Zipp, A. Tartaro, S Newman, R. H. Browne, P. Davous, R. Sanchez, M. Muros, M. E. Kornhuber, A. Lavarone, M. Mohr, M. R. Garcia, S. Russell, H. Kellar-Wood, M. R. Tola, B. Ostermeyer, Ch. Tzekov, K. Sartor, E. B. Ringelstein, P. P. Gazzaniga, Paul Krack, H. Fidaner, H. Rico, T. Dbaiss, F. Alameda, E. Torchiana, L. Rumbach, I. Charques, J. M. Bogaard, C. D. Frith, L. J. Rappelle, R. Brenner, A. Joutel, K. Fuxe, G. HÄcker, M. J. Blaser, J. Valls-SolÇ, G. Ulm, M. Alberdi, A. Bock, F. W. Bertelsmann, U. Wieshmann, J. Visa, J. R. Lupski, D. D'Amico, L. M. P. Ramos, A. A. Vanderbark, R. Horn, M. Warmuth, Dietmar Kühne, Mark S. Palmer, C. Ehrenheim, E. Canga, S. Viola, O. Scarpino, P. Naldi, R. Almeida, A. A. Raymond, J. Gamez, Stephan Arnold, A. DiGiovanni, J. Dalmau, C. C. Chari, H. F. Beer, J. C. Koetsier, J. Iriarte, E. Yunis, J. Casadevall, E. Le Guern, E. Stenager, S. R. Benbadis, J. M. Warter, F. Burklin, I. Theodorou, L. Johannesen, G. A. Graveland, X. Leclerc, I. Vecchio, L. Ozelius, G. Nicoletti, R. K. Gherardi, E. Esperet, M. L. Delodovici, F. Cattin, F. Paiau, Giorgio Sacilotto, C. A. J. Broere, D. Chavdarov, J. P. Willmer, C. H. Hawkes, Th. Naegele, E. Ellie, E. Dartigues, M. J. Guardiola, S. Hesse, Z. Levic, Marco Rovaris, P. Saugeir-Veber, B. A. Yaqub, H. F. Durwen, R. Larumbe, J. Ballabrina, M. Sendtner, J. Röther, M. Horstink, C. Kluglein, M.P. Montesi, H. Apaydin, J. Montoya, E. Waubant, Ch. Verellen-Dunoulin, A. Nicolai, J. Lopez-Delval, R. Lemon, G. Cantinho, E. Granieri, A. Zeviani, Wolfgang H. Oertel, U. Ficola, V. Di Piero, V. Fragola, K. Sabev, M. V. Guitera, I. Turki, F. Bolgert, P. Ingrand, J. M. Gobernado, L. M. E. Grimaldi, S. Baybas, B. Eymard, Y. Rolland, Y. Robitaille, Ta. Pampols, P. J. Koehler, A. Carroacedo, J. Vilchez, S. Di Vittorio, I. R. Rise, T. Nagy, M. Kuffner, E. Palazzini, A. Ott, J. Pruim, T. X. Arbizu, E. Manetti, C. Cervera, S. Felber, G. Gursoy, J. Scholz, G. A. Buscaino, M. S. Chen, A. Pascual, J. Hazan, J. U. Gajda, J. G. Cea, G. Bottini, G. Damalik, F. Le Doze, G. Bonaldi, J. M. Hew, C. Messina, A. M. Kennedy, J. M. Carney, N. M. F. Murray, M. Parent, M. Koepp, V. Dimova, D. De Leo, K. Jellinger, G. Salemi, S. Mientus, M. L. Hansen, F. Mazzucchelli, J. Vieth, M. Mauri, E. Bartels, L. Johannsen, C. Humphreys, J. Emile, D. N. Landon, E. Kansu, R. Sanchez-Pernaute, Rsj Frackowiak, M. Gonzalez Torres, L. Oller, C. Machedo, J. Kother, M. Billiard, H. Durak, T. Schindler, A. Frank, A. Uncini, A. Sbriccoli, C. Farinas, D. W. Paty, N. Fast, A. T. Zangaladze, A. Kerkhofs, J. M. Pino Garcia, I. De la Fuente, B. Marini, L. Gomez, I. Rubio, Alessandra Bardoni, C. Brodie, P. Acin, U. Sliwka, S. A. Hawkins, S. Tardieu, F. Vitullo, J. M. Pereira Monteino, R. Gagliardi, T. Jezewski, A. Cano, T. Lempert, F. Abad Alegria, G. Rotondo, D. Ince, C. Martinez Parra, Y. Huang, H. Luders, Y. Steinvil, F. G. A. Van Der Meche, R. Bianchi, A. Sanchez, T. Sevilla, J. M. Ketelslegers, A. Domzal-Stryga, M. Pandolfo, M. O. Josse, K. W. Neff, I. Blanco, G. W. Bruyn, O. W. Witte, J. L. Thibault, G. Andersen, J. Pariset, A. Marcone, R. J. M. Lane, A. Hofman, M. Verin, T. Matilla, P. Bedoucha, J. Roche, M. Lai, M. Collard, A. Ugarte, F. Gallecho, D. Silbersweig, C. Kennard, J. P. Azulay, T. W. Ho, P. L. I. Dellemijn, R. Girardello, F. Baas, B. Voss, F. Rozenberg, E. M. Brocker, V. Stanev, A. A. J. Soeterboek, A. Marra, A. Rey, E. Ertem, M. Sawradewicz-Rybak, J. De Keyser, P. Cavallari, F. Proust, Y. Chevalier, H. C. Hansen, D. Leys, C. A. Davie, K. Hoang-Xuan, C. Bairati, H. van Crevel, Thomas T. Warner, B. Bompais, A. Dobbeleir, T Campbell, C. Macko, C. J. M. Klijn, M. Dussallant, T. P. Berlit, W. Rozenbaum, M. J. van den Bent, W. A. Rocca, M. Muller, H. Hundemer, U. Zifko, M. Campera, F. Drislane, D. Ranoux, T. M. Kloss, Anil Kumar, I. Ruolt, C. Bargnani, B. Marescau, N. A. Losseff, S. Notermans, B. Kint, E. T. Burke, C. Aykut, J. Matias Guiu, P. Maquet, T. Drogendijk, M. Leone, K. von Ammon, M. Pepeliarska, C. Prados, L. DiGiamberardino, T. Logtenberg, G. Lenoir, I. Castaldo, Damhaut, M. Radionova, G. Sirabian, R. Navon, Giovanni Antonini, K. Al Moutaery, E. Chamas, R. Schönhuber, M. Giannini, B. Debilly, I. Labatut, H. Henon, J. A. Egido, M. Baudrimont, J. N. Lorenzo, J. E. C. Bromberg, R. Antonacci, J. J. Vilchez, T. Moulin, B. Rautenstrauss, Giovanni Meola, J. Noth, S Mammi, P. Laforet, F. Lopez, C. Gehring, S. Bort, G. Rancurel, D. Decamps, S. Kostadinova, Y. Shapira, B. Neundoerfer, D. Chavrot, M. Solimena, J. P. Salier, W. Deberdt, R. Hoff-Jörgensen, A. Messina, S. Meairs, G. Rosoklija, E. Nelis, I. Bertran, C. Ertekin, J. Lohmeyer, Mitermayer Galvao dos Reis, L. Calo, E. Maccagnano, A. P. Hays, J. Verlooy, M. G. Forno, T. Blanco, L. Bail, Gabriella Silvestri, J. Montero, F. Bertrand, R. T. Ghnassia, C. Besses, T. Sereghy, F. Shalit, G. Bogliun, S. Braghi, St. Baykouchev, C. Franke, A. Lasa, L. C. Archard, J. Kriebel, S. Shaunak, M. Nocito, Alexander Tsiskaridze, E. Manfredini, T. Seigal, David G. Gadian, M. Barlas, J. D. Degos, C. Seeber, J. Caemert, J. L. Mas, R. B. Pepinsky, M. G. D'Angelo, N. Baumann, S. Yorifuji, H. P. Endtz, M. A. Cassatella, R. A. C. Hughes, V. Golzi, A. Bittencourt, A. Ferreira, M. Sanson, C. Alper, M. Vermeulen, M. A. A. van Walderveen, E. Alexiou, C. H. Lucas, M. Fiorelli, Y. N. Debbink, R. Gil, S. Congia, T. Banerjee, J. M. Bouchard, A. N. Pinto, A. Ceballos-Baumann, G. Grollier, P. I. M. Schmitz, M. D. Catata, N. Lahat, N. S. Rao, P. Papathanasopoulos, J. Valls-Solé, D. Claus, G. Schroter, A. Castro, C. Videbaek, R. Martinez Dreke, A. D. Platts, M. Hermesl, A. C. PeÇanha-Martins, M. Cardoso Silva, P. Masnou, M. J. A. Tanner, Ch. Confavreux, B. Mishu, H. Rasmussen, L. Valenciano, Carlo Pozzilli, S. W. Li, V. Salzman, Y. Vashtang, Massimo Franceschi, M. Severo, G. Deuschl, S. Setien, G. Mariani, A. Protti, J. Castillo, M. J. B. Taphoorn, M. Frontali, I. Milonas, D. Decoq, J. A. Navarro, S. Castellvi-Pel, C. Ertikin, M. Urtasun, Y. Lajat, B. E. Kendall, E. Verdu, B. Gueguen, E. Boisen, R. Couderc, A Danek, JM Stevens, F. Nicoli, L. Feltri, M. L. Vazquez-Andre, J. A. Morgan-Hughes, L. D'Angelo, F. Y. Liew, L. F. Pascual, J. Patrignani Ochoa, Vittorio Martinelli, J. Cophignon, L. Zhang, S. Martin, J. F. Meder, H. C. Buschmann, L. Bertin, J. van Gijn, A. Barreiro, A. Cools, C. Leon, A. Berod, E. A. Anllo, E. Zanette, L. Petrov, R. Barona, B. Gallicchio, P. J. Cozzone, N. Diederich, G. Cancel, L. Schelosky, P. Orizaola, K. Yulug, S. Ozer, Valeria A. Sansone, B. Guiraud-Chaumeil, K. Voigt, P. Labauge, M. Eoli, J. Zhu, J. Aguirre, M. Ferrarini, B. Zyluk, E. Planas, A. Cadilha, C. Tortorella, H. Bismuth, C. E. Counsell, A. Laun, A. Ferlini, Rio J. Montalban, N. Biary, L. Becker, M. Fardeau, M. Poloni, V. M. S. de Bruin, C. Fornada, J. Barros, E. Ganzmann, E. Touze, D. Wallach, J. Peila, H. Fujimura, M. T. Iba-Zizen, G. Macchi, C. Villoslada, R. Gouider, Ph. Rondepierre, P. Grummich, P. Chiodi, C. Conte, M. Michels, P. Annunziata, G. Semana, C. Sommer, J. Vajsar, D. Zekin, J. Kulisevsky, David G. Munoz, B. Jacotot, M. Magoni, A. Luxen, T. Garcia-Silva, S. Di Cesare, Christophe Tzourio, M. Gomori, I. Picomell, L. Santoro, F. Villa, Giovanni Pennisi, T. Ribalta, J. M. Molto, L. Marzorati, P. Loiseau, F. Gemignani, A. Gironell, J. Wissel, A. Prusinski, F. Cailloux, P. Villanueva-Hemandez, P. Cozzone, T. Del Ser, J. Sans-Sabrafen, M. Zappia, P. W. A. Willems, G. Tchernia, D. Gardeur, R. Bauer, F. Palomo, H. Metz, S. Lamoureux, C. Chastang, I. Reinhard, A. Goldfarb, S. Harder, Jordi Río, C. Ozkara, E. Tekinsoy, P. Vontobell, J. De Recondo, M. Rabasa, L. Lacomblez, F. Boon, Dgt Thomas, V. Palma, Renato Mantegazza, A. Dervis, M. Nueckel, B. YalÇinerner, I. Duran, G. Dalla Volta, A. Zubimendi, J. Pinheiro, A. Marbini, Xavier Montalban, H. Wekerle, X. Pereira Monteino, F. Crespo, F. Koskas, N. Battistini, C. Ruiz, H. Offner, J. de Pommery, P. Kanovsky, J. Y. Barnett, J. Pardo, G. Tomei, R. Rene, H. M. Lokhorst, P. Thajeb, H. Bilgin, D. McGehee, R. Fahsold, L. Morgante, Katie Sidle, C. Delwaide, M. N. Diaye, P. H. Rice, A. Creange, C. Sabev, K. Stephan, K. WeilBenborn, G. Magnani, L. Grymonprez, F. Cardellach, M. Kaps, N. G. Meco, F. Vega, V. Bonifati, A. Desomer, M. Baldy-Moulinier, G. Kvale, F. J. Authier, B. Yegen, T. Ho, J. M. Rozet, E. A. Cabanis, L. Bruce, L. Ambrosoli, M. A. Petrella, M. Hernandez, P. Timmings, H. B. van der Worp, F. Mahieux, A. Urbano-Marquez, D. A. Krendel, A. A. Garcia, R. Divari, R. Michalowicz, M. R. Piedmonte, M. Bondavalli, M. Zanca, P. F. Ippel, Onofre Combarros, B. Tavitian, E. Hirsch, I. Anastasopoulos, A. Roses, A. Köhler, P. Vienna, V. Timmerman, P. Sergi, F. Cornelio, A. Di Pasquale, R. Verleger, S. Castellvirel, J. Proano, B. van Moll, F. Rubio, W. Hacke, I. Lavenu, L. Zetta, M. W. Tas, N. Bittmann, M. Bonamini, O. R. Hommes, V. Dousset, N. Afsar, S. Belal, R. R. Myers, J. Goes, Giuseppe Vita, E. Clementi, V. G. Karepov, M. Jueptner, A Vincent, P. Emmrich, Th. Heb, A. Caballo, J. Gallego, T. Mokrusch, C. Perla, L. Gebuhrer, O. 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Brizioli, J. Calleja, L. Publio, M. Desi, R. Soffietti, P. Cortinovis-Tourniaire, E. F. Gonano, G. Cavaletti, S. Uselli, K. Westerlind, H. Betuel, C. O. Dhiver, H. Guggenheim, M. Hamon, R. Fazio, P. Lehikoinen, A. Esser, B. Sadzot, G. Fink, Angelo Antonini, D. Bendahan, V. Di Carlo, G. Galardi, A. F. Boller, M. Aksenova, Del Fiore, V. de la Sayette, H. Chabriat, A. Nicoletti, A. Dilouya, M. L. Harpin, E. Rouillet, J. Stam, A. Wolters, M. R. Delgado, Eduardo Tolosa, G. Said, A. J. Lees, L. Rinaldi, A. Schulze-Bonhage, MA Ron, C. Lefebvre, E. W. Radü, R. Alvarez, M. L. Bots, P. Reganati, S. Palazzi, A. Poggi, N. J. Scolding, V. Sazdovitch, T. Moreau, E. Maes, M. A. Estelies, P. Petkova, Jose-Felix Marti-Masso, G De La Meilleure, N. Mullatti, M. Rodegher, N. C. Notermans, T. A. T. Warner, S. Aktan, J. P. Louboutin, L. Volpe, C. Scheidt, W. Aust, C. M. Wiles, U. Schneider, S. K. Braekken, W. R. Willems, K. Usuku, Peter M. Rothwell, C. Talamon, M. L. Sacchetti, A. Codina, M. H. Marion, A. 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Bauermann, Nereo Bresolin, J. Vallée, B. C. Jacobs, A. Campos, Werner Poewe, J. A. Villanueva, A. W. Kornhuber, A. Malafosse, E. Diez-Tejedor, G. Jungreia, M. J. A. Puchner, A. Komiyama, O. Saribas, V. Volpini, L. Geremia, S. Bressi, A. Nibbio, Timothy E. Bates, T. z. Tzonev, E. Ideman, G. A. Damlacik, G. Martino, G. Crepaldi, T. Martino, Kjell Någren, E. Idiman, D. Samuel, J. M. Perez Trullen, Y. van der Graaf, J. O. Thorell, M. J. M. Dupuis, E. Sieber, R. D'Alessandro, C. Cazzaniga, J. Faiss, A. Tanguy, A. Schick, I. Hoksergen, A. Cardozo, R. Shakarishvili, G. K. Wennlng, J. L. Marti-Vilalta, J. Weissenbach, I. L. Simone, Amalia C. Bruni, Darius J. Adams, C. Weiller, A. Pietrangeli, F. Croria, C. Vigo-Pelfrey, Patricia Limousin, A. Ducros, G. Conti, O. Lindvall, E. Richter, M. Zuffi, A. Nappo, T. Riise, J. Wijdenes, M. J. Fernandez, J. Rosell, P. Vermersh, S. Servidei, M. S. C. Verdugo, F. Gouttiere, W. Solbach, M. Malbezin, I. S. Watanabe, A. Tumac, W. I. McDonald, D. A. 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C. Patrosso, N. L. Gershfeld, P. A. J. M. Boon, O. Sabouraud, M. Lara, J. Svennevig, G. L. Lenzi, A. Barrio, H. Villaroya, JosÇ M. Manubens, O. Boespflug-Tanguy, M. Carreras, D. A. Costiga, J. P. Breux, S. Lynn, C. Oliveras Ley, A. G. Herbaut, J. Nos, C. Tornali, Y. A. Hekster, J. L. Chopard, J. M. Manubens, P. Chemouilli, A. Jovicic, F. Dworzak, S. Smirne, S. E. Soudain, B. Gallano, D. Lubach, G. Masullo, G. Izquierdo, A. Pascual Leone Pascual, A. Sessa, V. Freitas, O. Crambes, L. Ouss, G. W. Van Dijk, P. Marchettini, P. Confalonieri, M. Donaghy, A. Munnich, M. Corbo, and M. E. L. van der Burg

Subjects
Neurology, business.industry, Media studies, Library science, Medicine, Neurology (clinical), business
Published
1994
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12. Plasmapheresis in Chronic Active Antibody Mediated Rejection

Author

H. Akoglu, A. Haspulat, D. Ayli, O. Merhametsiz, Z. Ercan, C. Bulut, T. Yildirim, B. Canbakan, I. Akdag, Gok E. Oguz, and Karaveli G. Gursoy

Subjects
Transplantation, business.industry, Chronic Active, medicine.medical_treatment, Antibody mediated rejection, Immunology, Medicine, Plasmapheresis, business
Published
2014
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16. Comparison of the genotoxicity of propofol and desflurane using the comet assay in the lymphocytes of patients who underwent lumbar discectomy: A randomized trial.

Author

Toker MK, Altiparmak B, Gursoy G, Uysal AI, Dede G, Gundogdu G, Dodurga Y, and Ugur B

Subjects
Humans, Male, Female, Adult, Middle Aged, Lumbar Vertebrae surgery, Anesthetics, Intravenous adverse effects, Isoflurane analogs & derivatives, Isoflurane adverse effects, Propofol adverse effects, Desflurane, Diskectomy methods, Comet Assay methods, Lymphocytes drug effects, Anesthetics, Inhalation adverse effects, DNA Damage drug effects
Abstract

Objectives: To compare the genotoxic effects of desflurane and propofol using comet assay in patients undergoing elective discectomy surgery., Methods: This was a randomized controlled study. Patients who underwent elective lumbar discectomy under general anesthesia with propofol or desflurane were included in the study. Venous blood samples were obtained at 4 different time points: 5 minutes before anesthesia induction (T1), 2 hours after the start of anesthesia (T2), the first day after surgery (T3), and the fifth day following surgery (T4). Deoxyribonucleic acid damage in lymphocytes was assessed via the comet assay., Results: A total of 30 patients, 15 in each group, were included in the analysis. The groups were similar in terms of age and gender distribution. There were no significant differences in demographics, duration of surgery, total remifentanil consumption, and total rocuronium bromide consumption. The comet assay revealed that head length, head intensity, tail intensity, tail moment at T1 were similar in the desflurane and propofol groups. Head length, tail length and tail moment measured in the desflurane group at T4 were significantly higher compared to the propofol group. Tail lengths of the desflurane group at T1, T2 and T3 were significantly higher than the corresponding values in the propofol group., Conclusion: Propofol and desflurane do not appear to induce DNA damage in lymphocytes. However, when the quantitative data were compared, it was determined that propofol had relatively lower genotoxic potential than desflurane. ClinicalTrials.gov Reg. No.: NCT05185167 ., (Copyright: © Saudi Medical Journal.)

Published
2024
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17. Privacy-preserving cancer type prediction with homomorphic encryption.

Author

Sarkar E, Chielle E, Gursoy G, Chen L, Gerstein M, and Maniatakos M

Subjects
Humans, Computer Security, Algorithms, Genomics, Privacy, Neoplasms genetics
Abstract

Cancer genomics tailors diagnosis and treatment based on an individual's genetic information and is the crux of precision medicine. However, analysis and maintenance of high volume of genetic mutation data to build a machine learning (ML) model to predict the cancer type is a computationally expensive task and is often outsourced to powerful cloud servers, raising critical privacy concerns for patients' data. Homomorphic encryption (HE) enables computation on encrypted data, thus, providing cryptographic guarantees to protect privacy. But restrictive overheads of encrypted computation deter its usage. In this work, we explore the challenges of privacy preserving cancer type prediction using a dataset consisting of more than 2 million genetic mutations from 2713 patients for several cancer types by building a highly accurate ML model and then implementing its privacy preserving version in HE. Our solution for cancer type inference encodes somatic mutations based on their impact on the cancer genomes into the feature space and then uses statistical tests for feature selection. We propose a fast matrix multiplication algorithm for HE-based model. Our final model achieves 0.98 micro-average area under curve improving accuracy from 70.08 to 83.61% , being 550 times faster than the standard matrix multiplication-based privacy-preserving models. Our tool can be found at https://github.com/momalab/octal-candet ., (© 2023. The Author(s).)

Published
2023
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18. Treatment of cervical cancer by electrochemotherapy with bleomycin, cisplatin, and calcium: an in vitro experimental study.

Author

Gursoy G, Esmekaya MA, and Cicek Z

Subjects
Female, Humans, Cisplatin pharmacology, Bleomycin pharmacology, Calcium, HeLa Cells, Electroporation methods, Electrochemotherapy methods, Uterine Cervical Neoplasms drug therapy, Antineoplastic Agents pharmacology
Abstract

Low-dose chemotherapy in advanced stages of cancer does not give a positive response in treatment. The use of high-dose antineoplastic drugs creates significant side effects. The limiting situation in treatment creates a need for new generation drugs with less side effects and new treatment methods that will enable low-dose drug use. Electroporation (EP), a phenomenon, is a technique in which the membrane permeability is increased by the establishment of hydrophilic pores in the cell membrane with short and high-voltage electrical pulses. In the present investigation study, we aimed to inspect the effects of EP plus bleomycin, cisplatin, and calcium administration (CaEP) on cell viability, apoptotic activity, gene expression p53, Bax/Bcl-2 rate mitochondrial membrane potential (ΔΨm), and cell cycle in HeLa cervical cancer cell line. The permeabilization of the membrane was evaluated in flow cytometry with the PI method, and cell viability was measured in an ELISA reader with the WST-8 method. For bleomycin and cisplatin doses applied to HeLa cells, the concentration values (IC 50 ) that inhibited 50% of the cells were found to be 214.11 ± 4.7 µM and 35.16 ± 3.3 µM, respectively. The IC 50 values of the groups administered together with EP were calculated as 0.44 ± 0.3 µM for bleomycin and 20.55 ± 4.3 µM for cisplatin. There was no change in cell viability in calcium alone application, but a statistically notable reduction in cell vitality was observed in CaEP application. An increase in ΔΨm was found in bleomycin and CaEP exposure with EP. It was determined that EP exposure caused G0/G1 arrest in the cell cycle at all electric field intensities. It was determined that EP application in HeLa cells increased bleomycin cytotoxicity 487 times and cisplatin cytotoxicity 1.71 times, and CaEP could be an alternative treatment method., (© 2022. The Author(s), under exclusive licence to Springer Science+Business Media, LLC, part of Springer Nature.)

Published
2022
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19. Privacy-preserving Model Training for Disease Prediction Using Federated Learning with Differential Privacy.

Author

Khanna A, Schaffer V, Gursoy G, and Gerstein M

Subjects
Algorithms, Humans, Machine Learning, Privacy
Abstract

Machine learning is playing an increasingly critical role in health science with its capability of inferring valuable information from high-dimensional data. More training data provides greater statistical power to generate better models that can help decision-making in healthcare. However, this often requires combining research and patient data across institutions and hospitals, which is not always possible due to privacy considerations. In this paper, we outline a simple federated learning algorithm implementing differential privacy to ensure privacy when training a machine learning model on data spread across different institutions. We tested our model by predicting breast cancer status from gene expression data. Our model achieves a similar level of accuracy and precision as a single-site non-private neural network model when we enforce privacy. This result suggests that our algorithm is an effective method of implementing differential privacy with federated learning, and clinical data scientists can use our general framework to produce differentially private models on federated datasets. Our framework is available at https://github.com/gersteinlab/idash20FL.

Published
2022
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20. Do antimicrobial stewardship programs improve the quality of care in ICU patients diagnosed with infectious diseases following consultation? Experience in a tertiary care hospital.

Author

Gursoy G, Uzun O, Metan G, Yildirim M, Bahap M, Demirkan SK, Topeli A, Akinci SB, Topcuoglu MA, Berker M, Hazirolan G, Akova M, and Unal S

Subjects
Adult, Anti-Bacterial Agents therapeutic use, Humans, Intensive Care Units, Referral and Consultation, Tertiary Care Centers, Antimicrobial Stewardship, Communicable Diseases drug therapy
Abstract

Background: One of the most important public health concerns is the ever-growing problem of antibiotic resistance. Importantly, the rate of introduction of new molecules into clinical practice has slowed down considerably. Moreover, the rapid emergence of resistance shortens the effective 'lifespan' of these molecules., Objective: The quality of care before and after active intervention and feedback was evaluated in patients diagnosed with sepsis/septic shock or ventilator-associated pneumonia (VAP) in the ICUs of Hacettepe University Adult and Oncology Hospitals., Results: There was a significant increase in total scores. Significant improvements were achieved in the management of these patients in terms of requests for necessary diagnostic tests, and the prolonged infusion of beta-lactam agents., Conclusion: Implementation of an ASP in centers where antimicrobial management of ICU patients is largely controlled by infectious diseases specialists remains a feasible strategy that leads to better patient care., (Copyright © 2021 The Author(s). Published by Elsevier Ltd.. All rights reserved.)

Published
2022
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21. Establishing a Global Standard for Wearable Devices in Sport and Exercise Medicine: Perspectives from Academic and Industry Stakeholders.

Author

Ash GI, Stults-Kolehmainen M, Busa MA, Gaffey AE, Angeloudis K, Muniz-Pardos B, Gregory R, Huggins RA, Redeker NS, Weinzimer SA, Grieco LA, Lyden K, Megally E, Vogiatzis I, Scher L, Zhu X, Baker JS, Brandt C, Businelle MS, Fucito LM, Griggs S, Jarrin R, Mortazavi BJ, Prioleau T, Roberts W, Spanakis EK, Nally LM, Debruyne A, Bachl N, Pigozzi F, Halabchi F, Ramagole DA, Janse van Rensburg DC, Wolfarth B, Fossati C, Rozenstoka S, Tanisawa K, Börjesson M, Casajus JA, Gonzalez-Aguero A, Zelenkova I, Swart J, Gursoy G, Meyerson W, Liu J, Greenbaum D, Pitsiladis YP, and Gerstein MB

Subjects
Consensus, Exercise, Humans, Sports, Sports Medicine, Wearable Electronic Devices
Abstract

Millions of consumer sport and fitness wearables (CSFWs) are used worldwide, and millions of datapoints are generated by each device. Moreover, these numbers are rapidly growing, and they contain a heterogeneity of devices, data types, and contexts for data collection. Companies and consumers would benefit from guiding standards on device quality and data formats. To address this growing need, we convened a virtual panel of industry and academic stakeholders, and this manuscript summarizes the outcomes of the discussion. Our objectives were to identify (1) key facilitators of and barriers to participation by CSFW manufacturers in guiding standards and (2) stakeholder priorities. The venues were the Yale Center for Biomedical Data Science Digital Health Monthly Seminar Series (62 participants) and the New England Chapter of the American College of Sports Medicine Annual Meeting (59 participants). In the discussion, stakeholders outlined both facilitators of (e.g., commercial return on investment in device quality, lucrative research partnerships, and transparent and multilevel evaluation of device quality) and barriers (e.g., competitive advantage conflict, lack of flexibility in previously developed devices) to participation in guiding standards. There was general agreement to adopt Keadle et al.'s standard pathway for testing devices (i.e., benchtop, laboratory, field-based, implementation) without consensus on the prioritization of these steps. Overall, there was enthusiasm not to add prescriptive or regulatory steps, but instead create a networking hub that connects companies to consumers and researchers for flexible guidance navigating the heterogeneity, multi-tiered development, dynamicity, and nebulousness of the CSFW field., (© 2021. The Author(s), under exclusive licence to Springer Nature Switzerland AG.)

Published
2021
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22. Expect the unexpected: fungemia caused by uncommon Candida species in a Turkish University Hospital.

Author

Alp S, Gulmez D, Kardas RC, Karahan G, Tas Z, Gursoy G, Ayaz-Ceylan CM, Arikan-Akdagli S, and Akova M

Subjects
Adult, Aged, Female, Hospitals, University, Humans, Male, Middle Aged, Retrospective Studies, Risk Factors, Turkey epidemiology, Candida classification, Candidemia epidemiology, Candidemia microbiology, Cross Infection epidemiology, Cross Infection microbiology
Abstract

Fungemia caused by uncommon Candida species (UCS) (other than C.albicans, C.glabrata, C.parapsilosis, C.tropicalis, C.krusei) is a rare but emerging threat with their potential to exhibit reduced susceptibility or resistance to antifungal agents. We identified 25 patients with UCS fungemia (9 C.kefyr, 8 C.lusitaniae, 4 C.dubliniensis, 2 C.guilliermondii, 1 C.pelliculosa, 1 C.rugosa) through January 2011 and August 2018. Echinocandins were the most common administered agents, followed by fluconazole. Overall mortality was 44%. Echinocandins and voriconazole showed sufficient activity against all tested isolates. High fluconazole MICs among C.guilliermondii, C.pelliculosa, and C.rugosa were determined. MIC value of C.pelliculosa was above the epidemiological cut-off proposed for fluconazole.

Published
2021
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23. Mixed fungaemia: an 18-year report from a tertiary-care university hospital and a systematic review.

Author

Gülmez D, Alp S, Gursoy G, Ayaz CM, Dogan O, Arikan-Akdagli S, and Akova M

Subjects
Adult, Aged, Aged, 80 and over, Antifungal Agents pharmacology, Coinfection drug therapy, Coinfection mortality, Female, Fungemia microbiology, Fungemia mortality, Hospitals, University, Humans, Incidence, Male, Middle Aged, Retrospective Studies, Tertiary Care Centers, Treatment Outcome, Turkey epidemiology, Yeasts drug effects, Yeasts isolation & purification, Antifungal Agents therapeutic use, Coinfection microbiology, Drug Resistance, Fungal drug effects, Fungemia drug therapy, Yeasts classification
Abstract

Background: While fungaemia caused by two or more different species of yeasts (mixed fungaemia, MF) is infrequent, it might be underestimated., Aims: This study aimed to determine the incidence of MF, clinical characteristics of the patients, and antifungal susceptibility profiles of the isolates with a systematic review of the literature., Sources: Data sources were PubMed and Scopus., Study Eligibility Criteria: Studies reporting ten or more mixed fungaemia episodes., Content: Study included MF episodes in adults between January 2000 and August 2018 in Hacettepe University Hospitals, Turkey. The isolation, identification and antifungal susceptibility testing (AFST) of the isolates were by standard mycological methods. Patient data were obtained retrospectively. Literature search was performed using relevant keywords according to PRISMA systematic review guidelines. A total of 32 patients with 33 MF episodes were identified. Among all fungaemia episodes, MF incidence was 3.7% (33/883). All patients had one or more underlying disorders among which solid-organ cancer (50.0%, 16/32) was the most common. Overall mortality was 51.5% (17/33). The most preferred antifungal agents for initial treatment were fluconazole (48.5%, 16/33) and echinocandins (39.4%, 13/33). Fluconazole susceptible-dose-dependent (S-DD) or -resistant Candida species were detected in 15 episodes, and an isolate of C. parapsilosis was classified as S-DD by AFST. All Candida isolates were susceptible to echinocandins. Non-candida yeasts with intrinsic resistance/reduced susceptibility to both echinocandins and fluconazole were detected in two episodes. Systematic review of the literature revealed 24 studies that reported more than ten MF episodes. Methodology was variable. Improvement of detection rates was reported when chromogenic agars were used. Most studies underlined detection of isolates with reduced susceptibility., Implications: Although rare, the MF rate is affected by the detection methods, which have improved in recent years. Fluconazole and echinocandins were used for initial treatment in accordance with the current guideline recommendations; however, isolates non-susceptible to both were detected. Detection of a mixed infection offers an opportunity for optimum treatment., (Copyright © 2020 European Society of Clinical Microbiology and Infectious Diseases. Published by Elsevier Ltd. All rights reserved.)

Published
2020
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24. Evaluation of Invasive and Noninvasive Methods for the Diagnosis of Helicobacter Pylori Infection

Author

Cosgun Y, Yildirim A, Yucel M, Karakoc AE, Koca G, Gonultas A, Gursoy G, Ustun H, and Korkmaz M

Abstract

Objective: The present study was conducted to evaluate invasive and noninvasive diagnostic methods for detection of Helicobacter pylori (H. pylori) in patients admitted with dyspeptic complaints and to compare sensitivities and specificities. Method: Sets of four gastric biopsy specimens were obtained from a total of 126 patients included in the study. The presence of H. pylori was determined by invasive tests including culture, rapid urease test, polymerase chain reaction (PCR) and histopathology. Among noninvasive tests, urea breath test, serological tests and enzyme-linked immunosorbent assay (ELISA) were performed. Results: H. pylori was isolated in 79 (62.7%) gastric biopsy cultures, whereas positivity was concluded for 105 (83.3%) patients by rapid urease test, for 106 (84.1%) by PCR, for 110 (87.3%) by histopathology, for 119 (94.4%) by urea breath test, and for 107 (84.9%) by ELISA. In the present study, the culture findings and histopathological examination findings were accepted as gold standard. According to the gold standard, urea breath test had the highest sensitivity (96.5%) and the lowest specificity (30%), whereas culture and histopathology had the highest specificities (100%). Conclusion: The use of PCR invasively with gastric biopsy samples yielded parallel results with the gold standard. PCR can be recommended for routine use in the diagnosis of H. pylori., (Creative Commons Attribution License)

Published
2016
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25. Mechanisms of stochastic focusing and defocusing in biological reaction networks: insight from accurate chemical master equation (ACME) solutions.

Author

Gursoy G, Terebus A, Youfang Cao, and Jie Liang

Subjects
Computer Simulation, Models, Biological, Probability, Stochastic Processes, Algorithms
Abstract

Stochasticity plays important roles in regulation of biochemical reaction networks when the copy numbers of molecular species are small. Studies based on Stochastic Simulation Algorithm (SSA) has shown that a basic reaction system can display stochastic focusing (SF) by increasing the sensitivity of the network as a result of the signal noise. Although SSA has been widely used to study stochastic networks, it is ineffective in examining rare events and this becomes a significant issue when the tails of probability distributions are relevant as is the case of SF. Here we use the ACME method to solve the exact solution of the discrete Chemical Master Equations and to study a network where SF was reported. We showed that the level of SF depends on the degree of the fluctuations of signal molecule. We discovered that signaling noise under certain conditions in the same reaction network can lead to a decrease in the system sensitivities, thus the network can experience stochastic defocusing. These results highlight the fundamental role of stochasticity in biological reaction networks and the need for exact computation of probability landscape of the molecules in the system.

Published
2016
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26. Unique Toll-Like Receptor 4 Activation by NAMPT/PBEF Induces NFκB Signaling and Inflammatory Lung Injury.

Author

Camp SM, Ceco E, Evenoski CL, Danilov SM, Zhou T, Chiang ET, Moreno-Vinasco L, Mapes B, Zhao J, Gursoy G, Brown ME, Adyshev DM, Siddiqui SS, Quijada H, Sammani S, Letsiou E, Saadat L, Yousef M, Wang T, Liang J, and Garcia JG

Subjects
Animals, Binding Sites, Cells, Cultured, Humans, Mice, Mice, Inbred C57BL, Mice, Knockout, Models, Chemical, Molecular Docking Simulation, Pneumonia immunology, Protein Binding, Protein Conformation, Cytokines chemistry, Cytokines immunology, NF-kappa B immunology, Nicotinamide Phosphoribosyltransferase chemistry, Nicotinamide Phosphoribosyltransferase immunology, Toll-Like Receptor 4 chemistry, Toll-Like Receptor 4 immunology, Ventilator-Induced Lung Injury immunology
Abstract

Ventilator-induced inflammatory lung injury (VILI) is mechanistically linked to increased NAMPT transcription and circulating levels of nicotinamide phosphoribosyl-transferase (NAMPT/PBEF). Although VILI severity is attenuated by reduced NAMPT/PBEF bioavailability, the precise contribution of NAMPT/PBEF and excessive mechanical stress to VILI pathobiology is unknown. We now report that NAMPT/PBEF induces lung NFκB transcriptional activities and inflammatory injury via direct ligation of Toll-like receptor 4 (TLR4). Computational analysis demonstrated that NAMPT/PBEF and MD-2, a TLR4-binding protein essential for LPS-induced TLR4 activation, share ~30% sequence identity and exhibit striking structural similarity in loop regions critical for MD-2-TLR4 binding. Unlike MD-2, whose TLR4 binding alone is insufficient to initiate TLR4 signaling, NAMPT/PBEF alone produces robust TLR4 activation, likely via a protruding region of NAMPT/PBEF (S402-N412) with structural similarity to LPS. The identification of this unique mode of TLR4 activation by NAMPT/PBEF advances the understanding of innate immunity responses as well as the untoward events associated with mechanical stress-induced lung inflammation.

Published
2015
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27. Multiscale Modeling of Cellular Epigenetic States: Stochasticity in Molecular Networks, Chromatin Folding in Cell Nuclei, and Tissue Pattern Formation of Cells.

Author

Liang J, Cao Y, Gursoy G, Naveed H, Terebus A, and Zhao J

Subjects
Algorithms, Humans, Models, Biological, Protein Folding, Protein Structure, Tertiary, Signal Transduction, Cell Differentiation genetics, Cell Nucleus, Chromatin chemistry, Epigenesis, Genetic physiology, Gene Expression Regulation, Morphogenesis genetics
Abstract

Genome sequences provide the overall genetic blueprint of cells, but cells possessing the same genome can exhibit diverse phenotypes. There is a multitude of mechanisms controlling cellular epigenetic states and that dictate the behavior of cells. Among these, networks of interacting molecules, often under stochastic control, depending on the specific wirings of molecular components and the physiological conditions, can have a different landscape of cellular states. In addition, chromosome folding in three-dimensional space provides another important control mechanism for selective activation and repression of gene expression. Fully differentiated cells with different properties grow, divide, and interact through mechanical forces and communicate through signal transduction, resulting in the formation of complex tissue patterns. Developing quantitative models to study these multi-scale phenomena and to identify opportunities for improving human health requires development of theoretical models, algorithms, and computational tools. Here we review recent progress made in these important directions.

Published
2015
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28. [A case of right common carotid and left internal carotid artery obliteration. (Angiographic study of cerebral collateral circulation)].

Author

Gursoy G, Ertem G, Tangor A, Tukel K, Aktin E, Bengisu U, and Tanan I

Subjects
Aged, Aortography, Brachial Artery diagnostic imaging, Carotid Arteries diagnostic imaging, Cerebral Angiography, Cerebrovascular Circulation, Female, Humans, Methods, Prognosis, Arteriosclerosis Obliterans diagnostic imaging, Carotid Artery Diseases diagnostic imaging, Collateral Circulation
Published
1969

29. [A case of vertebro-vertebral syndrome indicating multiple extracranial vascular pathology].

Author

Buyukozturk K, Gursoy G, Aktin E, Ertem G, Bengisu U, and Tanan I

Subjects
Carotid Artery Diseases complications, Cerebral Angiography, Cerebrovascular Circulation, Cerebrovascular Disorders complications, Collateral Circulation, Hemiplegia etiology, Humans, Ischemic Attack, Transient diagnosis, Ischemic Attack, Transient etiology, Male, Middle Aged, Neurologic Examination, Basilar Artery, Cerebrovascular Disorders diagnosis, Hemiplegia diagnosis, Vertebral Artery
Published
1969

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