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147 results on '"Brumen, Milan"'

1. The maximum entropy production principle and linear irreversible processes

Author

Zupanovic, Pasko, Kuic, Domagoj, Losic, Zeljana Bonacic, Petrov, Drazen, Juretic, Davor, and Brumen, Milan

Subjects
Condensed Matter - Statistical Mechanics
Abstract

It is shown that Onsager's principle of the least dissipation of energy is equivalent to the maximum entropy production principle. It is known that solutions of the linearized Boltzmann equation make extrema of entropy production. It is argued, in the case of stationary processes, that this extremum is a maximum rather than a minimum., Comment: 12 pages, revtex4

Published
2010
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2. Osmosis at constant volume and water uptake in tall trees

Author

Zupanovic, Pasko, Brumen, Milan, Fajmut, Ales, Kuic, Domagoj, and Juretic, Davor

Subjects
Physics - Chemical Physics, Physics - Biological Physics
Abstract

We consider a thermodynamic state of a solvent and solution separated with an elastic semipermeable membrane in a box with a constant volume and the relevance of this simple model for the water uptake in tall trees. Under moderate concentrations of a solute, the solution and solvent are under the positive and negative pressure, respectively. In the case of the soft membrane the pressure difference between the compartments with the solvent and solution is given by van't Hoff equation. A state of the negative pressure is not stable and after some time cavitations transform the solvent into the state of coexisting liquid and bubbles of saturated vapor. The pressure difference between the solvent and solution decreases and the membrane relaxes restoring the liquid phase in the compartment with solvent. In this way the solvent oscillates between the tensile state and the coexisting state of liquid and bubbles of saturated vapor. The xylem and phloem, the main vascular systems in trees, are coupled with ray cells. Assuming that a sap in these systems is kept under the constant volume the osmosis between the xylem and phloem with ray cells sustains the negative pressure of the xylem sap. Due to the osmosis elastic energy stored in walls of tracheary element could repair cavitations. In this way both water transport in tall trees and cavitations repair in tracheary elements are related to the osmosis under constant volume. A possible explanation of two long standing problems in tree physiology, water uptake in tall trees and cavitations repair, are offered within this model., Comment: 16 pages, 7 figures

Published
2009

4. Maximum Entropy Production and Maximum Shannon Entropy as Germane Principles for the Evolution of Enzyme Kinetics

Author

Dobovišek, Andrej, Županović, Paško, Brumen, Milan, Juretić, Davor, Abarbanel, Henry, Series editor, Braha, Dan, Series editor, Érdi, Péter, Series editor, Friston, Karl, Series editor, Haken, Hermann, Series editor, Jirsa, Viktor, Series editor, Kacprzyk, Janusz, Series editor, Kaneko, Kunihiko, Series editor, Kirkilionis, Markus, Series editor, Kurths, Jürgen, Series editor, Nowak, Andrzej, Series editor, Reichl, Linda, Series editor, Schuster, Peter, Series editor, Schweitzer, Frank, Series editor, Sornette, Didier, Series editor, Thurner, Stefan, Series editor, Dewar, Roderick C., editor, Lineweaver, Charles H., editor, Niven, Robert K., editor, and Regenauer-Lieb, Klaus, editor

Published
2014
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15. Hollow polyelectrolyte shells: exclusion of polymers and Donnan equilibrium

Author

Sukhorukov, Gleb B., Brumen, Milan, Donath, Edwin, and Mohwald, Helmuth

Subjects
Polyelectrolytes -- Research, Colloids -- Research, Chemicals, plastics and rubber industries
Abstract

Hollow polyelectrolyte shells were formed by the stepwise adsorption of polyelectrolyte molecules onto colloids followed by the subsequent removal of the colloidal core. The capsules exclude poly(styrenesulfonate) at least from a molecular weight of 4200 upward, but are permeable for small ions. A Donnan equilibrium situation was created when impermeable polyelectrolytes were added to the bulk phase. The produced pH differences depend on the capsule size. However, osmotic shrinkage of the capsules due to the presence of bulk polyions limited the free volume available.

Published
1999

18. Abstracts

Author

Grilc, Sonja, Kuster, Vlasta, Zorec, Robert, Japelj, Irena, Ilievski, Vladimir, Budihna, Metka V., Marhl, Marko, Brumen, Milan, Schuster, Stefan, Heinrich, Reinhart, Martin, T. F. J., Pozzan, Tullio, Rupnik, M., Kreft, M., Sikdar, S. K., Zorec, R., Sikdar, Sujit K., Kreft, Marko, Smith, S. M., Namkung, Y., Foletti, D., Klingauf, J., Shin, H. S., Scheller, R. H., Tsien, R. W., and Zupančič, Gregor

Published
2000
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19. Contributory presentations/posters

Author

Gries, A., Singh, Balwinder, Nakazawal, Chicko, Genest, D., Getzoff, E. D., Matsuo, H., Kaur, Harpreet, Borst, J. W., Chadha, K. C., Tingyun, Kuang, Jagannadham, M. V., Leijon, Mikael, Sato, S., Bhakuni, Vlnod, Vijayan, M., Surolia, A., Suguna, K., Manoj, N., Srinivas, V. R., Ravishankar, R., Laggner, P., Prassl, R., Schwarzenbacher, R., Zeth, K., Kostner, G. M., Taylor, Susan S., Xuong, Nguyen-huu, Akamine, Pearl, Sagar, Bidva M., Saikrishnan, K., Purnapatre, K., Handa, P., Roy, S., Varshney, U., Biswal, B. K., Sukumar, N., Rao, J. K. Mohana, Johnson, A., Pattabhi, Vasantha, Murthy, M. R. N., Krishna, Sri S., Savithri, H. S., Sastri, Mira, Hosur, M. V., Pillai, Bindu, Kannan, K. K., Kumar, Mukesh, Patwardhan, Swati, Padmanabhaa, B., Sasaki-Sugio, S., Matsuzaki, T., Nukaga, M., Singh, T. P., Sharma, A. K., Srinivasan, A., Khan, J. A., Paramasivam, M., Kumar, P., Karthikevan, S., Sharma, S., Yadav, S., Srintvasan, A., Alam, Neelima, Gourinath, S., Kaur, Punit, Chandra, Vikas, Betzel, Ch., Ghosh, S., Bera, A. K., Pal, A. K., Baneriee, Asok, Mukhopadhyay, B. P., Bhattacharya, S., Chakraborty, S., Haldar, U., Dey, I., Solovicova, Adriana, Sevcik, Jozef, Sekar, K., Sundaralingam, M., Genov, N., Liang, Dong-cai, Zhang, Ji-ping, Jiang, Tao, Chang, Wen-rui, Blommers, Marcel, Jahnke, Wolfgang, Hosur, R. V., Panchal, S. C., Pillay, Bindu, Jaganathan, N. R., Mathur, Puniti, Srivatsun, S., Joshi, Ratan Mani, Chauhan, V. S., Govil, Girjesh, Atreya, H. S., Sahu, S. C., Quinjou, Éric, Adjadj, Elisabeth, Mispelter, Joël, Izadi-Pruneyre, Nadia, Blouquit, Yves, Heyd, Bernadette, Lerat, Guilhem, Desmadreil, Michel, Milnard, Philippe, Lin, Y., Rao, B. D. Nageswara, Raghunathan, Vidva, Chau, Mei H., Coutinho, Evans, Pesais, Prashant, Srivastava, Sudha, Saran, Anil, Srikrishnan, Thamarapu, Lijima, Herbert, Gesme, Jayson, Sapico, Leizl F., Paxton, Raymond, Grace, C. R., Nagenagowda, G., Lynn, A. M., Cowsik, Sudha M., Govil, G., Sahu, Sarata C., Bhattacharya, A., Chauhan, S., Kumar, Anil, Zuiderweg, Erik R. P., Pellecchia, Maurizio, Nitta, Katsutoshi, Ohnishi, Atsushi, Kawano, Keiichi, Hikichi, Kunio, Fujitani, Naoki, Ohkubo, Tadayasu, Aizawa, Tomoyasu, Kumaki, Yasuhiro, Hayakawa, Yoichi, Parvathy, Rani V., Kini, R. M., Nakagawa, Astushi, Tanaka, Isao, Demura, Makoto, Yao, Min, Koshiba, Takumi, Kobashigawa, Yoshihiro, Kuwajima, Kunihiro, Linge, Jens, Nilges, Michael, Donoghue, Seán O., Chakshusmathi, G., Ratnaparkhi, Girish S., Madhu, P. K., Varadarajan, R., Tetreau, C., Tourbez, M., Lavalette, D., Bulone, D., Manno, M., Emanuele, A., Palma-Vittorelli, M. B., Palma, M. U., Vaiana, S. M., Martorana, V., Biagio, P. L. San, Chang, D. K., Cheng, S. F., Yang, S. H., Francis, S., Trivedi, V. D., Chien, W. J., Manstein, Dietmar J., Batra, Renn, Geeves, Michael A., Geller, Maciej, Trvlska, Joanna, Grochowski, Pawel, Lesyng, B., Ginalski, K., Grochowski, P., Lavalette, P., Blouquit, Y., Roccatano, D., Berendsen, H. J. C., Amadei, A., Nola, Di A., Ho, Bosco, Curmi, P. M. G., Berry, H., Pelta, J., Pauthe, E., Lairez, D., Srinivasan, M., Sahi, Shakti, Kothekar, V., Madhusudnan, Kartha S., Nandel, Fateh S., Jain, D. V. S., Berendsen, Herman J. C., Feenstra, Anton K., Tama, F., Sanejouand, Y.-H., Go, N., Sharma, Deepak, Pasha, Santosh, Sharma, Sunita, Brahmachari, Samir K., Makker, Jyoti, Viiavaraghavan, R., Kumar, S., Dey, Sharmisllia, Krishnamoorthy, G., Lakshmikanth, G. S., Zaitseva, E. M., Mazhul, V. M., Kierdaszuk, Borys, Widengren, J., Rigler, R., Terry, B., Mets, Ü., Swaminathan, R., Yathindra, N., Thamotharan, S., Chosrowjan, H., Mataga, N., Shibata, Y., Morisima, I., Xiao, Ming, Selvin, Paul, Chakraharty, Tania, Cooke, Roger, Faraone, A., Branca, C., Maisano, G., Migliardo, P., Magazù, S., Villari, V., Behere, Digambar V., Deva, Sharique Zahida Waheed M., Vallone, B., Savino, C., Travaglini-Allocatelli, C., Cutruzzolà, F., Brunori, M., Gibson, Q. H., Mazumdar, Shyamalava, Mitra, Samaresh, Prasad, Swati, Soto, P., Fayad, R., Tyulkova, N. A., Sukovataya, I. E., Mamedov, Sh. V., Aksakal, B., Canturk, M., Aktas, B., Yilgin, R., Bogutska, K. I., Miroshnichenko, N. S., Wein, A. J., Hypolite, J. A., DiSanto, M., Chacko, S., Zheng, Y-M., Antosiewicz, J., Wojciechowski, M., Grycuk, T., Di Nola, Alfredo, Ceruso, Marc A., Chatterjee, Bishnu P., Bandvopadhvay, Subhasis, Choudhury, Devapriva, Khight, Stefan, Thompson, Andrew, Stojanoff, Vivian, Pinkner, Jerome, Hultgren, Scott, Flatters, Delphine, Goodfellow, Julia, Takazawatt, Fumi, Kanehisa, Minoru, Sasai, Masaki, Nakamura, Hironori, Wang, Bao Han, Pan, xin Min, Zheng, Yuan, Wang, Zhi Xin, Ahmad, Atta, Kulkarni, Sangeeta, Prakash, Koodathingal, Prajapati, Shashi, Surin, Alexey, Kihara, Hiroshi, Yang, Li, Matsumoto, Tomoharu, Nakagawa, Yuki, Semisotnov, Gennady V., Kimura, Kazumoto, Amemiya, Yoshiyuki, Tayyab, Saad, Muzammil, Salman, Kumar, Yogesh, Bhakuni, Vinod, Sundd, Monica, Kundu, Suman, Jagannadham, Medicherla V., Chandani, Bina, Warrier, Deepti, Sinha, Lalankumar, Dhar, Ruby, Mehrotra, Sonam, Khandelwal, Purnima, Seth, Subhendu, Gidwani, Arun, Prabha, Ratna C., Sasidhar, Y. U., Madhusudan, K. P., Nishikawa, Ken, Kinjo, Akira R., Varadarajan, Raghavan, Chakravarty, Suvobrata, Van Dael, H., Noyelle, K., Joniau, M., Haezebrouck, P., Jha, Indra Brata, Bhat, Rajiv, Dash, Sheffali, Mohanty, Prasanna, Bandyopadhyay, A. K., Sonawat, H. M., Rao, Ch. Mohan, Datta, Siddhartha, Raman, B., Rajaraman, K., Ramakrishna, T., Pande, A., Benedek, G., King, J., Betts, S., Pande, J., Asherie, N., Ogun, O., Kalacheva, G. S., Sokolova, I. V., Mitaku, Shigeki, Sonoyama, Masashi, Taira, Kunihiro, Yokoyama, Yasunori, Sasakil, Takanori, Kamo, Naoki, Mukai, Yuri, Dalal, Seema, Regan, Lynne, Mituku, Shigeki, Kumar, Devesh, Roychoudhury, Mihir, Lőrinczv, Dénes, Könczöl, Franciska, Farkas, László, Belagyi, Joseph, Schick, Christoph, Thomson, Christy A., Ananthanarayanan, Vettai S., Alirzayeva, E. G., Baba-Zade, S. N., Sarai, A., Kono, H., Uedaira, H., An, J., Gromiha, Michael M., Oobatake, M., Yutani, Katsuhide, Takano, Kazufumi, Yamagata, Yuriko, Jas, Gouri S., Hofrichter, James, Muñoz, Victor, Eaton, William A., Penoyar, Jonathan, Lo Verde, Philip T., Bódi, Á., Venekei, I., Kardos, J., Gráf, L., Závodszky, P., Szilágyi, András, Závodszky, Péter, Woolfson, D. N., Walshaw, J., Allan, R. D., Funahashi, Jun, Gupta, Savan, Di Nola, A., Mangoni, M., Roccatano, P., Ramachandraiah, Gosu, Chandra, Nagasuma R., Ciani, Barbara, Woolfson, Derek N., Nair, Usha B., Salunke, Dinakar M., Kaur, Kanwal J., Swaminathan, Chittoor P., Surolia, Avadhesha, Pramanik, A., Jörnvall, H., Nygren, P.-Å., Jonasson, P., Ståhl, S., Johansson, B.-L., Kratz, G., Wahren, J., Ekberg, K., Uhlén, M., Jansson, O. T., Uhlén, S., Misselwitz, Rolf, Welfle, Heinz, Welfle, Karin, Höhne, Wolfgang, Kurganov, B. I., Mitskevich, L. G., Fedurkina, N. V., Jarori, Gotam K., Maity, Haripada, Guharay, J., Sengupta, P. K., Sengupta, B., Sridevi, K., Kasturi, S. R., Gupta, S. P., Agarwal, Gunjan, Briehl, Robin W., Kwong, Suzanne, Tyulkova, N A., Ismailova, O. I., Parola, A. H., Yayon, A., Hariharan, C., Pines, D., Pines, E., Zamai, M., Cohen-Luria, R., Woolfeon, D. N., Spooner, G. A., Padya, M. J., Bharadwaj, D. K., Bakshi, Panchan, Jagannathan, N. R., Sharma, U., Srivastava, N., Barthwal, R., Matsuda, Keiko, Nishioka, Takaaki, Go, Nobuhiro, Urata, S., Aita, T., Husimi, Y., Majumder, Mainak, Subirana, Juan A., Malinina, Lucy, Abrescia, Nicola G. A., Aymami, Juan, Coll, Miquel, Eritxa, Ramón, Premraj, B. J., Thenmalarchelvi, R., Gautham, N., Kumar, Satheesh P., Kan, Lou-Sing, Hou, Ming, Lin, Shwu-Bin, Roy, Kanal B., Sana, Tapas, Bruant, N., Flatters, D., Lavery, R., Sklenar, Heinz, Rons, Remo, Lavery, Richard, Thakur, Ashoke Ranjan, Kundu, Sudip, Bandyopadhyay, Debashree, Bhattacharyya, Dhananjay, Majumdar, Rabi, Barceló, F., Portugal, J., Rao, B. J., Ramanathan, Sunita, Gliosli, Mahua, Varshney, Umesh, Kumar, Vinay N., Pataskar, Shashank S., Sarojini, R., Selvasekarapandian, S., Kolandaivel, P., Sukumar, S., Kolmdaivel, P., Maiti, Motilal, Das, Suman, Sen, Anjana, Xodo, Luigi, Suraci, Chiara, Del Terra, Elisa, Quadrifoglio, Franco, Diviacco, Silvia, Ray, Arghya, Rao, Basuthkar J., Karthikeyan, G., Chary, Kandala V. R., Mujeeb, Anwer, James, Thomas L., Bogdanov, A., Zanina, A., Haya, E. E. F., Kasyanenko, N., Cornélio, M. L., Bugs, M. R., Tolstorukov, Ye. M., Sanval, Nitish K., Tiwari, S. N., Sanyal, Nitish K., Choudhury, Mihir Roy, Patel, P. K., Bhavesh, Neel S., Gabrielian, Anna, Rigler, Rudolf, Edman, Lars, Wennmalm, Stefan, Constantinescu, B., Gazdaru, D., Radulcscu, I., Radu, L., Wärmländer, Sebastian, Aoki, Setsuyuki, Ishiura, Masahiro, Kondo, Takao, Pashinskaya, V. A., Kosevich, M. V., Shelkovsky, V. S., Blagoy, Yu. P., Wang, Ji-hua, Malathi, R., Chandrasekhar, K., Kandimalla, E. R., Agrawal, S., Rastogi, V. K., Palafox, Alcolea M., Singh, Chatar, Beniaminov, A. D., Minyat, E. E., Zdobnov, E. M., Ulyanov, N. B., Bondarenko, S. A., Ivanov, V. I., Singh, J. S., Tewari, Ravindra, Sonawane, Kailas D., Grosjean, Henri, Sonavane, Uddhavesh B., Morin, Annie, Doherty, Elizabeth A., Doudna, Jennifer A., Tochio, H., Shirakawa, M., Kyogoku, Y., Das, Achintya, Javaram, B., Kalra, Parul, Shukla, Piyush, Dixit, Surjit B., Beveridge, David L., McConnell, Kevin, Davidson, B. E., Chan, R. Y. S., Sawyer, W. H., Eccelston, J. F., Yan, Yuling, Norden, Bengt, Tuite, Eimer, Nielsen, Peter, Takahashi, Masayuki, Ghosh, Anirban, Bansal, Manju, Pingoud, Alfred, Christ, Frauke, Thole, Hubert, Pingoud, Vera, Wende, Wolfgang, Luthra, Pratibha Mehta, Chandra, Ramesh, Sen, Ranjan, Weisberg, Robert, King, Rodney, Gobets, Bas, van Amerongen, Herbert, van Stokkum, Ivo H. M., Larsen, Olaf F. A., van Grondelle, Rienk, Hilbers, Cornelis W., Heus, Hans A., Berends, Jos, Sngrvan, H E., Khudaverdian, N. V., Babayan, Yu. S., Pichierri, F., Gromiha, M., Prabakaran, P., Aida, M., Sayano, K., Merkienė, Eglė, Vilkaitis, Giedrius, Klimašauskas, Saulius, Serva, Saulius, Weinhold, Elmar, Bandiera, Antonella, Marsich, Eleonora, Manzini, Giorgio, Potikyan, G., Arakelyan, V., Babayan, Yu., Ninaber, Alex, Goodfellow, Julia M., Ohta, Shigeru, Ito, Yoichiro, Husimi, Yuzuru, Usukura, J., Aiba, H., Tagami, H., Nunes, Elia, Suarez, Mougli, Candreva, Carmen E., Keszenman, Deborah, Thyberg, Per, Földes-Papp, Zeno, Joshi, Amita, Singh, Dinesh, Rajeswari, M. R., Amenitsch, H., Pregetter, M., Chapman, J., Mishra, K. P., Pandev, B. N., Tonevitsky, A. G., Pohl, E. E., Agapov, I. I., Sun, J., Pohl, P., Dennison, S. M., Gorbeako, G. P., Dynbko, T. S., Mishra, A. K., Pappavee, N., Luis, Loura, Rodrigo, Almeida, Manuel, Prieto, Gendel, Ya. L., Kleszczyńska, H., Kuczera, J., Przestalski, S., Kral, T., Chernitsky, E. A., Senkovich, O. A., Rosin, V. V., Gasanov, R. A., Allakhverdieva, Y. M., Papageorgiou, G. C., Savopol, Tudor, Apetrei, Calin, Balea, Marius, Cucu, D., Mihailescu, D., Ramanathan, K. V., Bačić, Goran, Genest, Monique, Sajot, Nicolas, Garnier, Norbert, Crouzy, Serge, Zsiros, O., Várkonyi, Z. S., Combos, Z., Farkas, T., Cribier, Sophie, de Paula, F., Fraceto, I. F., Schreier, S., Spisni, A., Sevšek, F., Žekš, B., Gomišček, G., Svetina, S., Arrigler, V., Hotani, Hirokazu, Nomura, Fumimasa, Takiguchi, Kingo, Nagata, Miki, Panicker, Lata, Parvathanathan, P. S., Hotani, H., Takiguchi, K., Ishino, A., Saitoh, A., Afonin, S., Takahashi, A., Takizawa, T., Nakato, Y., Marathe, Dipti, Jørgensen, Kent, Chattopadhyay, Amitabha, Rukmini, R., Rawat, Satinder S., Pečar, S., Štrancar, J., Šentiurc, M., Stolič, Z., Filipin, K., Biswas, S. C., Samanta, Anunay, Sana, Satyen, Kinoshita, Koji, Yamazaki, Masahito, Ohki, Kazuo, Goto, Akira, Kiuchi, Tai, Kumeta, Takaaki, Ohba, Tetsuhiko, Sugar, I. P., Thompson, K. K., Biltonen, R. L., Thompson, T. E., Ichinose, H., Suezaki, Y., Akivama, M., Matuoka, S., Tsuchihashi, K., Gasa, S., Pike, H. M., Mattjus, P., Brown, R. E., Molotkovsky, J. G., Arora, Ashish, Kleinschmidt, Jörg H., Tamm, Lukas K., Kruglyakova, K. E., Luneva, O. G., Fedin, V. A., Kuptsoya, O. S., Visser, A. J. W. G., Visser, N. V., Dyubko, T. S., Ogihara, Toshihiko, Mishima, Kiyoshi, Shvaleva, A. L., Radenović, Č. N., Jeremić, M. G., Radenović, N. Č., Minić, P. M., Salakhutdinov, B. A., Aripov, T. F., Tadjibaeva, E. T., Zamaraeva, M. V., Vagina, O. N., Basak, A. K., Cole, A., Naylor, C., Poppofl, M., Titball, R., Naylor, C. E., Moss, D. S., Eaton, J. T., Justin, N., Titball, R. W., Nomura, F., Nagata, M., Ishjkawa, S., Takahashi, S., Obuchi, Kaoru, Staudegger, Erich, Lohner, Karl, Kriechbaum, Manfred, Waring, Alan J., Lehrer, Robert I., Mayer, Bernd, Köhler, Gottfried, Gangl, Susanne, Shobini, J., Hu, B., Lortz, B., Sackmann, E., Guttenberg, Z., Antonovich, A. N., Slobozhanina, E. I., Lukyanenko, L. M., Kozlova, N. M., Krylov, Andrey V., Kotova, Elena A., Antonenko, Yuri N., Yaroslavov, Alexander A., Ghosh, Subhendu, Bera, Amal K., Das, Sudipto, Urbánková, Eva, Freeman, Karl, Jelokhani-Niaraki, Masood, Jezek, Petr, Usmanov, P. B., Tonkikh, A. K., Ongarbaev, A., Pohl, Peter, Saparov, Sapar M., Harikumar, P., Reeves, J. P., Sikdar, S. K., Rao, S., Ghatpande, A. S., Corsso, C., Varanda, W. A., ElHamel, C., Dé, E., Molle, G., Saint, N., Varshney, Anurae, Mathew, M. K., Isacoff, E. Y., Loots, E., Kasai, Michiki, Yamaguchi, Naohiro, Ghosh, Paramita, Tigyi, Joseph, Miledi, Ricardo, Tigyi, Gabor, Liliom, Karoly, Djurisic, Maja R., Andjus, Pavle R., Shrivastava, Indira H., Sansom, M. S. P., Barrias, C., Oliveira, P. F., Lopes, I. A., Mauricio, A. C., Fedorovich, S. V., Konev, S. V., Sholukh, M. V., Chubanov, V. S., Klevets, M., Fedirko, N., Shvinka, N., Manko, V., Prabhananda, B. S., Kombrabail, Mamata H., Aravamudhan, S., Venegas-Cotero, Berenice, Blake, Ivan Ortega, Zhou, Han-qing, Hu, Xiao-jian, Zhang, Zhi-hong, Feng, Hang-fang, Cheng, Wei-ying, Zalyvsky, I. A., Dubitsky, L. O., Vovkanvch, L. S., Savio-Galimberti, E., Ponce-Homos, J. E., Bonazzola, P., Capurro, Claudia, Parisi, Mario, Toriano, Roxana, Thomas, David D., Ready, Laxma G., Jones, Larry R., Tashmukhamedov, B. A., Sagdullaev, B. T., Heitzmann, D., Bleich, M., Warth, R., Ferreira, H. G., Ferreira, K. T. G., Greger, R., Parola, Abraham H., Alfahel, Essa, Zagoory, Orna, Priel, Zvi, Hama-Inaba, H., Ohyama, H., Hayata, I., Choi, K., Haginoya, K., Mori, M., Wang, R., Yukawa, O., Nakajima, T., Joshi, Nanda B., Kannurpatti, Sridhar K., Sinha, Mau, Joshi, Preeti G., Bei, Ling, Hu, Tianhui, Shen, Xun, Knetsch, Menno L. W., Schäfers, Nicole, Sandblom, John, Galvanovskis, Juris, Kovacs, Eugenia, Dinu, Alexandra, Pologea-Moraru, Roxana, Sanghvi, S. H., Jazbinšek, V., Tronteli, Z., Thiel, G., Wübeller, G., Müller, W., Brumen, Milan, Fajmut, Leš, Marhl, Marko, Volotovski, I. D., Sokolovski, S. G., Knight, M. R., Chalyi, Alexander V., Vasilʼev, Alexei N., Sharma, P., Pant, H. C., Sharma, M., Amin, N. D., Albers, R. W., Steinbach, P. J., Barchir, J., Balasubramanyam, M., Gardner, J. P., Condrescu, M., Pilarczyk, Gotz, Greulich, K. O., Monajembashi, Shamci, El-Awadi, A. I., El-Refaei, F. M., Talaat, M. M., Ali, F. M., Zahradniková, Alexandra, Tahradník, Ivan, Pavelková, Jana, Zhorov, Boris S., Ananthanaravanan, Vettai S., Weiss, D. G., Martin, D., Gornik, E., Neu, E., Michailov, Ch. M., Welscher, U., Seidenbusch, W., Jellali, A., Pattnaik, B. 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M., Goel, Manisha, Kovalenko, E. I., Semenkova, G. N., Cherenkevich, S. N., Loganathan, D., Lakshmanan, T., Sriram, D., Srinivasan, S., Lebrón, J. A., Bjorkman, P. J., Ramalingam, T. S., Singh, A. K., Gayatri, T. N., Bisch, Paulo M., Caffarena, Ernesto R., Grigera, Raul J., Fromherz, P., Kiessling, V., Suresh, C. G., Rao, K. N., Khan, M. I., Gaikwad, S. M., Elanthiraiyan, M., Kaliannan, P., Payne, J., Chadha, K., Ambrus, J. L., Nair, M. P. N., Nair, Madhavan P. N., Hewitt, R., Schwartz, S. A., Mahajan, S., Macherel, D., Bourguignon, J., Neuburger, M., Douce, R., Cohen-Addad, C., Faure, M., Ober, R., Sieker, L., Gurumurthy, D. S., Velmurugan, S., Lobo, Z., Phadke, Ratna S., Desai, Prashant, Alieva, D. R., Guseinova, I. M., Zulfugarov, I. S., Aliev, J. A., Ismayilov, M. A., Novruzova, S. N., Savchenko, T. V., Suleimanov, Yu. S., Bartošková, Hana, Nauš, Jan, Ilík, Petr, Kouřil, Roman, Vidyasagar, P. B., Thomas, Sarah, Gaikwad, Jvoti U., Cseh, Z., Mustárdy, L., Garab, G., Simidjiev, I., Rajagopal, S., Várkonyi, Zs., Holzenburg, A., Stoylova, S., Papp, E., Millar, D. P., Bruder, R., Woo, T. T., Genick, U. K., Gerwert, K., Jávorfí, Tamás, Garab, Győző, Naqvi, Razi K., Gaikwad, Jyoti, Kalimullah, Md., Semwal, Manoj, Naus, Man, Ilik, Petr, Kouril, Roman, Horváth, Gábor, Bernard, Gary D., Pomozi, István, Wehner, Rüdiger, Damjanović, Ana, Schulten, Klaus, Ritz, Thorsten, Yandao, Gong, Jushuo, Wang, Nanming, Zhao, Jixiu, Shan, Freiberg, Arvi, Timpmann, Kõu, Woodbury, Neal W., Ruus, Rein, Nemtseva, E. V., Kudryasheva, N. S., Sizykh, A. G., Tikhomirov, A. A., Nesterenko, T. V., Shikhov, V. N., Forti, Giorgio, Furia, Alberto, Finazzi, Giovanni, Barbagallo, Romina Paola, Agalarov, R., Gasanov, R., Iskenderova, S., Nobuhiro, G. O., Osamu, Miyashita, Ramrakhiani, M., Soni, R. K., Yoshida, Masasuke, Akutsu, Hideo, Yagi, Hiromasa, Tozawa, Kacko, Sekino, Nobuaki, Iwabuchi, Tomoyuki, Kaulen, A. D., Avetisyan, A. V., Feniouk, B. A., Skulachev, V. P., Breyton, Cécile, Kühlbrandt, Werner, Gräslund, Astrid, Assarsson, Maria, Libisch, B., Horváth, G., Gombos, Z., Budagovskaya, N. V., Kudryasheva, N., Fukunishi, Arima, Harada, Erisa, Fukuoka, Yuki, Ohmura, Tomoaki, Kawai, Gota, Watanabe, Kimitsuna, Žekš, Boštjan, Božič, Bojan, Derganc, Jure, Svetina, Saša, Hoh, J. F. Y., Li, Z. B., Rossmanith, G. H., Frederix, P. L. T. M., de Beer, E. L., Treijtel, B. W., Blangè, T., Galtet, F., Hénon, S., Isabey, D., Planus, E., Laurent, V., Rath, L. S., Raval, M. K., Dash, P. K., Ramakrishnan, C., Balaram, R., Basak, Kanika, Balaban, Alexandra T., Nandy, Ashesh, Grunwald, Gregory D., Vracko, Marjan, Randic, Milan, Basak, Subhash C., Amic, Dragan, Beslo, Drago, Trinajstic, Nenad, Nikolic, Sonja, Walahaw, J., Lensink, Marc F. J., Reddy, Boojala V. B., Shindylov, Ilya N., Bourne, Philip E., Grigera, J. R., de Xammar Oro, J., Donnamaria, M. C., Neagu, Monica, Neagu, Adrian, Janežič, Dušanka, Praprotnik, Matej, Nilsson, Lennart, Mark, Pekka, Fata, La L., Dardenne, Laurent E., Werneck, Araken S., Neto, Marçal de O., Kannan, N., Vishveshwara, S., Veluraja, K., Opitz, David, Balasubramanian, Krishnan, Gute, Brian D., Mills, Denise, Lungeanu, Diana, Mihalas, G. I., Macovievici, G., Gruia, Raluca, Dalcin, B., Cortez-Maghelly, C., Passos, E. P., Ljubisavljevic, M., Blesic, S., Milosevic, S., Stratimirovic, D. J., Bachhawat, Nandita, Mande, Shekhar C., Nandy, A., Nishigaki, Koichi, Saito, Ayumu, Naimuddin, Mohammed, Takaesu, Hirotomo, Ono, Mitsuo, Hirokawa, Takatsugu, Eissa, A. M., Ahmed, Abdalla S., El Gohary, M. I., Nakashima, Hiroshi, Raghava, G. P. S., Kurgalvuk, N., Goryn, O., Gerstman, Bernard S., Kratasyuk, V. A., Esimbekova, E. N., Gritsenko, E. V., Remmel, N. N., Maznyak, O. M., German, A., Tikhonov, A., Tchitchkan, D., Koulchitsky, S., Pashkevich, S., Pletnev, S., Kulchitsky, V., Pesotskaya, Y., Shapiro, Erik M., Borthakur, Arijitt, Dimitrov, Ivan, Leigh, John S., Rizi, Rahim, Reddy, Ravinder, Charagundla, Sridhar, Duvvuri, Umamaheswar, Degaonkar, M., Khubchandani, M., Kumar, Mahesh, Jagannathan, N R., Raghunathan, P., Jayasundar, Rama, Coshic, O., Rath, O. K., Julka, P. K., Iliescu, Karina Roxana, Sajin, Maria, Petcu, Ileana, Moisoi, Nicolcta, Kuzmenko, A. I., Donchenko, G. V., Nikolenko, I. A., Morozova, R. P., Rahman, M. K., Ahmed, M. M., Watanabe, Takehiro, Uretzky, G., Ammar, R., Sharony, R., Rubin, Y., Gilboa, H., Mallick, H. N., Kumar, Mohan V., Begum, Gulnaz M., Degaonkar, Mahaveer N., Govindasamy, S., Kumosani, T. A., Lupusoru, C., Titescu, G., Haulica, I., Stefanescu, I., Iliescu, R., Nastasa, V., Bild, W., Khetawat, Gopal, Nealen, M., Faraday, N., Bray, P. F., Noga, S., Lycholat, E. A., Ananieva, T. V., Kosevich, M V., Stepanyan, S. G., Antonyuk, S. V., Khachatryan, A., Kumar, A., Arakelian, H., Khachatryan, R., Agadjanyan, S., Ayrapetyan, S., Mkheyan, V., Rajan, S. S., Kabaleeswaran, V., Gopalakrishnan, Geetha, Govindachari, T. R., Ramrakhiani, Meera, Cullen, David C., Lowe, Phillip, Badley, Andrew, Hermel, H., Möhwald, H., Schmahl, W., Singh, Anil K., Das, Joydip, Majumdar, Nirmalya, Dér, András, Oroszi, László, Kelemen, Loránd, Ormos, Pál, Hámori, András, Ramsden, Jeremy J., Mitra, Chanchal K., Savitri, D., Yanagida, Toshio, Esaki, Seiji, Sowa, Yosiyuki, Nishida, Tomoyuki, Kimura, Yuji, Radu, M., Laukhina, E. E., Kasumova, L. A., Koltover, V. K., Bubnov, V. P., Estrin, Ya. I., Dotta, Rajiv, Zahradník, Ivan, Marko, Milan, Novák, Pavel, Miyata, Hidetake, Hirata, Hiroaki, Sengupta, P., Maiti, S., Balaji, J., Banerjee, S., Barker, A. L., Winlove, C. P., OʼHare, D., Macpherson, J. V., Gonsalves, M., Unwin, P. R., Phillip, R., Kumar, Ravindra G., Murata, K., Nagayaka, K., Danev, R., Sugitani, S., Gősch, Michael, Thyberg, P., Földes-Papp, Z., Björk, G., Blom, H., Holm, J., Heino, T., Inagaki, Fuyuhiko, Yokochi, Masashi, Kusunoki, Masami, Matthews, E. K., Pines, J., Chukova, Yu. P., Koltover, Vitaly K., Kang, B. P. S., Bansal, Geetanjali, Bansal, M. P., Singh, U., Singh, Uma, Nakata, Kotoko, Nakano, Tastuya, Kaminuma, Tsuguchika, Kirn, Bonn, Potocnik, Neja, Stare, Vito, Shukla, Latal, Sastry, M. D., Natarajan, V., Devasagayam, T. P. A., Kesavan, P. C., Sayfutdinov, R., Degermendzhy, A. G., Adamovich, V. V., Rogozin, Yu. D., Khetrapal, C. L., Gowda, G. A. Nagana, Ghimire, Kedar Nath, Masaru, Ishida, Fujita, H., Ishiwata, S., Suzuki, M., Kawahara, S., Kirino, Y., Kishimoto, Y., Mori, H., Mishina, M., Ohshima, H., Dukhin, A. S., Goetz, P. J., Shilov, V. N., and Mishra, R. K.

Published
1999
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20. Kemijska modifikacija in karakterizacija površine polisulfonskih membran

Author

Kukovičič, Irena, Šoster, Robert, Brumen, Milan, Ribitsch, Volker, Wiegel, D., Arnold, K., and Stropnik, Črtomir

Subjects
polisulfonske membrane, sulfonization, kemijska modifikacija, Friedel-Crafts electrophilic substitution, organska kemijska tehnologija, polisulfoni, polysulfone, Friedel-Craftsove elektrofilne substitucije, hydrophylicity, sulfonizacija, hidrofilnost, hidrofobnost, karakterizacija, chemical modification, udc:541.64.057:577.352:616.15, hydrophobicity
Abstract

Asymmetric porous membranes were prepared from polysulfone by a wet-phase separation procedure. Different chemical modifications were applied to the upper membrane surface, i.e. the surface which was exposed to interaction with nonsolvent (water) in the coagulation bath during the membrane formation. The membrane surface was modified by the series of Friedel-Crafts electrophilic substitutions of aromatic rings in the polysulfone molecules. As a reagent 1-chlorodecane or propylene oxide dissolved in hexane and $AlCl_3$ as a catalyst were used. In the former case a hydrophobic and in the latter one a hydrophilic coating was achieved, respectively. The membrane surface was also modified by sulfonization with sulfuric (VI) acid water solution in this way negative charges were introduced at the membrane surface. The membranes, unmodified and chemically modified, were characterized by measuring the membrane thickness, the deionized water flux through the membrane, the zeta potential and contact angle. The specific chemical modifications of the membrane surface affect the water flux, the zeta potential and contact angle values whereas the membrane thickness remains unchanged. These effects are interpreted in terms of hydrophilicity and hydrophobicity, changes of the membrane surface charge and the thickness of shear layer at the membrane surface, all with respect to the particular modification applied. Reaction with 1-chlorodecane gave a hydrophobic surface by nonpolar $–(CH_2)_9-CH_3$ groups and reaction with propylene oxide gave a hydrophilic surface with polar group $-CH(CH_3)-CH_2-OH$. The surface of sulfonized polysulfone membranes contained ionizable ($-SO_3H$) functional groups. Površino asimetričnih poroznih membran iz polisulfona, pripravljenih po postopku mokre fazne separacije, smo kemijsko modificirali s Friedel-Crafts-ovo elektrofilno substitucijo aromatskih delov molekule polisulfona, kjer smo kot reagent uporabili 1-klorodekan in propilen oksid ob prisotnosti $AlCl_3$ kot katalizatorja. Na površino smo vezali nepolarne in polarne skupine, ki tvorijo hidrofobno oziroma hidrofilno oblogo. Površino membrane smo kemijsko modificirali tudi s sulfoniranjem z žveplovo(VI) kislino in s tem vezali na površino negativni naboj. Nemodificirane in kemijsko modificirane membrane smo karakterizirali z merjenjem debelin, pretokov za deionizirano vodo, potenciala zeta in omočitvenega kota. Kemijske modifikacije površine membrane so vplivale na pretok za deionizirano vodo, na potencial zeta in omočitveni kot, debelina pa je ostala nespremenjena. Te spremembe smo kvalitativno pojasnili s spremembami hidrofilnosti in hidrofobnosti ter spremembami naboja na površini in debeline mejnega sloja ob površini membrane. Pri reakciji z 1-klorodekanom tvorijo nepolarne $–(CH_2)_9-CH_3$ skupine hidrofobno površino, pri reakciji s propilen oksidom pa tvorijo polarne $–CH(CH_3)-CH_2-OH$ skupine hidrofilno površino. Površina membrane, modificirana z žveplovo(VI) kislino, pa vsebuje ionizabilne $–SO_3H$ funkcionalne skupine.

Published
2017

21. An approach to consider the arterial residual stresses in modelling of a patient-specific artery

Author

Urevc, Janez, Halilovič, Miroslav, Brumen, Milan, and Štok, Boris

Subjects
thermomechanics, finite element method, termomehanika, common carotid artery, breznapetostno stanje arterij, bolniki, človeška arterija, zaostale napetosti, patient-specific artery, skupna karotidna arterija, residual stresses, arterial zero-stress state, udc:531:616.13(045), metoda končnih elementov, nega
Abstract

In this work, the residual stress state of a human common carotid artery is predicted using the so-called thermomecha- nical analogy approach. The purpose of the approach is to enable consistent mapping of residual stresses and the respec- tive configuration from a circular arterial segment to a patient-specific arterial geometry. This is achieved by applying proper volumetric dilatations to the actual arterial stress-free in vivo geometry, which makes use of the analogy that states that the bending stresses can be obtained on an equivalent manner by applying proper thermal dilatations. The common carotid artery data are obtained in vivo from a healthy 28-year-old man using non-invasive methods. The pre- dicted residual stresses of the common carotid artery are in good quantitative agreement with the data from prior work in this field. The approach is validated by predicting the common carotid artery zero-stress state configuration, where a sector-like (cut-open) state is obtained. With this approach, it is thus possible to predict the residual stresses as well as the configuration of patient-specific arterial geometry without the need to model its cut-open zero-stress configuration.

Published
2017

28. Fizika

Author

Fajmut, Aleš and Brumen, Milan

Subjects
biofizika, študijsko gradivo, fizika, udc:53(075.8), okoljska fizika
Published
2012

30. Negative pressure in osmosis at constant volume and water uptake in tall tree

Author

Županović, Paško, Brumen, Milan, Fajmut, Aleš, and Juretić, Davor

Subjects
thermodynamic state, osmotic pressure, free energy, negative pressure, tall trees
Abstract

A thermodynamic state of solvent and solution separated with an elastic semipermeable membrane, in the box with a fixed volume, is considered. It is shown that the minimum value of free energy is accompanied by the compression of the solution and tension of the solvent [1-4]caused by the transfer of solvent molecules into compartment with solution . The tensile state of the solvent is described in terms of negative pressure. Due to the elastic properties of membrane the difference of pressure between compartments is less than osmotic pressure calculated with van't Hoff equation. However, it is still enough high to uptake water in tall trees. It is proposed that osmosis at constant volume could be responsible for the water uptake in tall trees. Using plausible arguments it is shown that embolism is followed with refilling in this process [5-7]. In other words embolism repair is possible in osmotic process under constant volume. References [1] Hirsch, H.R. “Gedanken Experiment”: Negative Solvent Pressure in Osmosis. J. Biol. Physics, 1980, 8, 11-13. [2] Freeman , R.D. Comment on Hirsch’s “Gedanken Experiment”: Negative Solvent Pressure in Osmosis. T J. Biol. Physics, 1981, 9, 47. [3] Hirsch, H.R. Further comments on Negative Solvent Pressure in Osmosis. J. Biol. Physics, 1983, 11, p. 26. [4] Scholander, P.F. The Role of Solvent Pressure in Osmotic Systems. Botany, 1966, 55, 1407-1414. [5] Zimmermann, U., Schneider, H., Wegner, L. H. and Haase, A. Water ascent in tall trees: does evolution of land plants rely on a highly metastable state? New Phytol., 2004, 162, 575-615. [6] Holbrook, N.M. and Zwieniecki, M.A. Embolism Repair and Xylem Tension: Do We Need a Miracle? 1999, Plant Physiology, 1999, 120, 7–10, [7 ] Zwieniecki, M.A. and Holbrook, N.M. Confronting Maxwell’s demon: biophysics of xylem embolism repair. Trends in Plant Science, 2009, 14, 530-534.

Published
2010

31. Evolutionary optimization of enzymatic reactions by Maximum Entropy Production Principle

Author

Dobovišek, Andrej, Županović, Paško, Kuić, Domagoj, Bonačić-Lošić, Željana, Brumen, Milan, and Juretić, Davor

Subjects
maximum entropy production, enzymatic reactions, evolutionary optimization
Abstract

A theoretical study of optimization of generalized reversible three state kinetic scheme of enzymatic reaction with respect to the Maximum Entropy Production Principle (MEPP) is presented. We calculated entropy production for each reaction transition of the kinetic scheme as a function either of forward or backward rate constant. We found that for each transition a unique maximum in entropy production exists, and, therefore, the optimal value of the corresponding rate constant could be calculated. Following idea that only second order rate constants are not subjected to evolution1, optimal values of rate constants predicted by MEPP principle are compared to known experimentally determined values for three different types of the enzyme beta-lactamase: beta- lactamase I, PC1 beta-lactamase and RTEM beta-lactamase2. Our results show that MEPP could be an appropriate principle for evolutionary optimization of enzymatic reactions. [1] Heinrich, R., Schuster, S., Holzhutter, H.-G.Mathematical analysis of enzyme reaction systems using optimization principles (1991) European Journal of Biochemistry, 201, 1-21. [2] H. Christensen, M.T. Martin and G. Waley β-lactamases as fully efficient enzymes. Determination of all the rate constants in the acyl-enzyme mechanism, (1990) Biochem. J. 266, 853-861.

Published
2010

32. The effect of the elasticity of membrane on the stability of the solvent in osmotic process at constant volume

Author

Županović, Paško, Brumen, Milan, Kuić, Domagoj, Fajmut, Aleš, and Juretić, Davor

Subjects
osmosis, negative pressure, cavitations, xylem-phloem, embolism repair
Abstract

The solvent in osmosis at constant volume is under negative pressure [1-4]. Negative pressure in solvent and osmotic pressure in solution are found as the function of the concentration of solute, geometry and elastic properties of the semipermeable membrane. It is known that the tensile state of the isolated solvent is not stable and cavitations turn it into stable state of coexisting gas and liquid. Using plausible arguments it is shown that this transition of the tensile solvent to coexisting phase can be reversible due to the elasticity of the semipermeable membrane. The reverse transition is diffusion and it is much slower that spontaneous direct transition. This mechanism is proposed as possible explanation of the embolism repair and refilling [5-7] in xylem-phloem system of land plants. References [1] Hirsch, H.R. “Gedanken Experiment”: Negative Solvent Pressure in Osmosis. J. Biol. Physics, 1980, 8, 11-13. [2] Freeman , R.D. Comment on Hirsch’s “Gedanken Experiment”: Negative Solvent Pressure in Osmosis. T J. Biol. Physics, 1981, 9, 47. [3] Hirsch, H.R. Further comments on Negative Solvent Pressure in Osmosis. J. Biol. Physics, 1983, 11, p. 26. [4] Scholander, P.F. The Role of Solvent Pressure in Osmotic Systems. Botany, 1966, 55, 1407-1414. [5] Zimmermann, U., Schneider, H., Wegner, L. H. and Haase, A. Water ascent in tall trees: does evolution of land plants rely on a highly metastable state? New Phytol., 2004, 162, 575-615. [6] Holbrook, N.M. and Zwieniecki, M.A. Embolism Repair and Xylem Tension: Do We Need a Miracle? 1999, Plant Physiology, 1999, 120, 7–10, [7 ] Zwieniecki, M.A. and Holbrook, N.M. Confronting Maxwell’s demon: biophysics of xylem embolism repair. Trends in Plant Science, 2009, 14, 530-534.

Published
2010

33. The significance of the xylem-phloem coupling in the upward water transport in plants

Author

Brumen, Milan, Fajmut, Aleš, Juretić, Davor, Kuić, Domagoj, and Županović, Paško

Subjects
xylem, osmotic, phloem, height, water transport, negative pressure
Abstract

Xylem is modelled as the closed system coupled to the root and phloem via semi-permeable membranes. The importance of the fixed volume of the xylem in the osmotic process between xylem and phloem is analysed. It is shown that negative pressure, a concept accepted as a driving force for the upward xylem water transport in many scientific discussions, is closely related to this process. It is shown that there is a self-consistency between decrease of the pressure in the xylem and increase of the concentration of the sugar in phloem, respectively, in dependence of the height. [1] Zimmermann, U., H. Schneider, L. H. Wegner, and A. Haase. 2004. Water ascent in tall trees: does evolution of land plants rely on a highly metastable state? New Phytol. 162:575-615. [2] Lampinen, M. J., and T. Noponen. 2003. Thermodynamic analysis of the interaction of the xylem water and phloem sugar solution and its significance for the cohesion theory. J. Theor. Biol. 224:285-298.

Published
2009

34. Maximum entropy production principle (MEPP) in generalized Michaelis-Menten kinetics

Author

Dobovišek, Andrej, Brumen, Milan, Županović, Paško, and Juretić, Davor

Subjects
entropy production, enzymatic reaction
Abstract

MEPP is a physical principle, widely used for quantitative explanation of non equilibrium phenomena in physics, chemistry and biology [1-3]. Here, we applied MEPP to study two and three state reversible Michaelis-Menten kinetic schemes of enzymatic reactions. By applying constraints as a diffusional limit for kinetic constants, constant free energy differences between enzymatic states and constant thermodynamic force, we calculated Shannon information entropy and entropy production of the entire reaction system as a function of forward rate constants. We found maxima in the net steady-state metabolic flux, total entropy production and Shannon entropy for equal values of forward rate constants. Moreover, for these values an analytical expression derived gives a relation between substrate and product concentrations at which enzymes operate in the optimal way. In conclusion, we demonstrated that MEPP is an appropriate selection principle for evolutionary optimization of enzymes. [1]Martyushev, L.M., Seleznev V.D. (2006) Physics Reports 426: 1-45. [2]Juretic, D., Zupanovic, P. (2003) CBC 27: 541 - 553. [3]Dewar, R.C., Juretic, D., Zupanovic, P. (2006) Chem. Phys. Lett. 430: 177-182.

Published
2009

35. Entropy production in enzymatic reactions

Author

Dobovišek, Andrej, Kuić, Domagoj, Bonačić Lošić, Željana, Brumen, Milan, Županović, Paško, and Juretić, Davor

Subjects
maximum entropy production, Michaelis-Menten kinetics, Shannon's entropy
Abstract

Theoretical studies from past years show that the principle of maximum entropy production (MEP) is widely accepted optimization principle used for quantitative explanation of many non-equilibrium phenomena [1]. From this point of view, the MEP principle is also of basic importance for understanding of biological systems, which operate in non-linear regime, far away from equilibrium state. For example, it was shown [2] that a rotary enzyme ATP-synthase produces entropy at a maximal value. The MEP principle was applied to analysis of one of the most important transition in the entire reaction scheme of this enzyme and it was able to predict the values of kinetic parameters associated with this transition, that are close to experimental values. We prove analytically in this work that maximal entropy production and optimal forward reaction rate constant can be associated with any chosen transition connecting two given basic free energy levels [3] in the case of an arbitrarily complex steady-state reaction scheme of an enzyme that can exist in a finite number of discrete states. The MEP principle is then applied to the analysis of the three-state kinetic scheme of enzymatic reaction considered in terms of generalized Michaelis-Menten steady-state kinetics. These three states are governed by three backward and three forward kinetic constants. By applying as constraints the maximal value of the product of forward reaction rate constants, constant free energy differences between enzymatic states, and constant thermodynamic force, we calculated Shannon entropy and entropy production as a function of any chosen couple of two forward rate constants. We show numerically and analytically that under these conditions there is a maximum in the net substrate to product steady-state flux, total entropy production and Shannon entropy of the system for the same optimal value of all three forward reaction rate constants. In conclusion, this is the first theoretical study were maximum entropy production is found for any given transition between two functionally important enzyme states and for the entire reaction scheme of an enzymatic reaction plus surrounding bath with substrates and products. We point out that the MEP principle and maximum Shannon entropy principle [4] can be treated as powerful physical selection principles for the evolutionary optimization of enzymes. [1] Martyushev, L.M., Seleznev V.D. Maximum entropy production principle in physics, chemistry and biology. (2006) Physics Reports 426: 1-45. [2] Dewar, R.C., Juretić, D., Županović, P. The functional design of the rotary enzyme ATP synthase is consistent with maximum entropy production.(2006) Chem. Phys. Lett. 430: 177-182. [3] Hill, T.L. Free Energy Transduction in Biology, Academic Press, London, 1977 [4] Jaynes, E.T. Probability Theory, Cambridge Univ. Press, 2003.

Published
2009

36. Entropy production and Shannon's entropy in enzymatic reactions

Author

Dobovišek, Andrej, Kuić, Domagoj, Bonačić Lošić, Željana, Brumen, Milan, Županović, Paško, and Juretić, Davor

Subjects
entropy production, information entropy
Abstract

Theoretical studies from past years show that the principle of maximum entropy production (MEP) is widely accepted optimization principle used for quantitative explanation of many non-equilibrium phenomena [1]. From this point of view, the MEP principle is also of basic importance for understanding of biological systems, which operate in non-linear regime, far away from equilibrium state. For example, it was shown [2] that a rotary enzyme ATP-synthase produces entropy at a maximal value. The MEP principle was applied to analysis of one of the most important transition in the entire reaction scheme of this enzyme and it was able to predict the values of kinetic parameters associated with this transition, that are close to experimental values. In the present contribution the MEP principle is applied to general analyses of the three-state kinetic scheme of enzymatic reaction considered in terms of Michaelis-Menten kinetics. These three states are governed by three backward and three forward kinetic constants. The system was elaborated in terms of the Hills graph theory [3]. By applying additional constraints for maximal values of forward reaction rate constants as well as constant free energy differences between the enzyme states, we calculated Shannon informational entropy and entropy production as a function of two forward rate constants of the second and third state. We can show numerically that under these conditions there is a maximum in the total entropy production of the system and Shannon informational entropy of the system. In conclusion, this is the first theoretical study were the maximum of total entropy production is found for the entire reaction scheme of enzymatic reaction. We point out that the MEP principle can be treated as a powerful physical selection principle for the evolutionary optimization of enzymes. References [1] Martyushev, L.M., Seleznev V.D. Maximum entropy production principle in physics, chemistry and biology. 2006 Physics reports 426: 1-45. [2] Dewar, R.C., Juretić, D., Županović, P. The functional design of the rotary enzyme ATP synthase is consistent with maximum entropy production.2006. CPL 430: 177-182. [3] T.L. Hill. Free energy transduction in biology, Academic Press, London, 1

Published
2009

37. Bacterial chemotaxis and entropy production

Author

Brumen, Milan, Županović, Paško, and Jagodič, Marko: Juretić, Davor

Subjects
bacterial chemotaxis, entropy production, Quantitative Biology::Cell Behavior
Abstract

The thermodynamic point of view is used to consider bacterial chemotaxis in a capillary tube, and entropy production is calculated for a migrating band of bacteria. It is found that the speed of the migrating band is a decreasing function of the starting concentration of the metabolizable attractant. The experimentally found dependence of speed on the starting concentration of galactose, glucose and oxygen is fitted with power law functions. It is found that the corresponding exponents lie within the theoretically predicted interval. The effect of the reproduction of bacteria on band speed is considered, too. The acceleration of the band, owing to the reproduction rate of bacteria, is predicted. The relationship between chemotaxis, the maximum entropy production principle and the formation of self-organizing structure is briefly discussed.

Published
2008

47. Lipid layers on polyelectrolyte multilayer supports

Author

Fischlechner, Martin, primary, Zaulig, Markus, additional, Meyer, Stefan, additional, Estrela-Lopis, Irina, additional, Cuéllar, Luis, additional, Irigoyen, Joseba, additional, Pescador, Paula, additional, Brumen, Milan, additional, Messner, Paul, additional, Moya, Sergio, additional, and Donath, Edwin, additional

Published
2008
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