151
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Hartono B, Heidebrecht P, Sundmacher K. Combined Branch and Bound Method and Exergy Analysis for Energy System Design. Ind Eng Chem Res 2012. [DOI: 10.1021/ie301232t] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
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152
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Flassig RJ, Sundmacher K. Optimal design of stimulus experiments for robust discrimination of biochemical reaction networks. Bioinformatics 2012; 28:3089-96. [PMID: 23047554 PMCID: PMC3516143 DOI: 10.1093/bioinformatics/bts585] [Citation(s) in RCA: 23] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
Abstract
MOTIVATION Biochemical reaction networks in the form of coupled ordinary differential equations (ODEs) provide a powerful modeling tool for understanding the dynamics of biochemical processes. During the early phase of modeling, scientists have to deal with a large pool of competing nonlinear models. At this point, discrimination experiments can be designed and conducted to obtain optimal data for selecting the most plausible model. Since biological ODE models have widely distributed parameters due to, e.g. biologic variability or experimental variations, model responses become distributed. Therefore, a robust optimal experimental design (OED) for model discrimination can be used to discriminate models based on their response probability distribution functions (PDFs). RESULTS In this work, we present an optimal control-based methodology for designing optimal stimulus experiments aimed at robust model discrimination. For estimating the time-varying model response PDF, which results from the nonlinear propagation of the parameter PDF under the ODE dynamics, we suggest using the sigma-point approach. Using the model overlap (expected likelihood) as a robust discrimination criterion to measure dissimilarities between expected model response PDFs, we benchmark the proposed nonlinear design approach against linearization with respect to prediction accuracy and design quality for two nonlinear biological reaction networks. As shown, the sigma-point outperforms the linearization approach in the case of widely distributed parameter sets and/or existing multiple steady states. Since the sigma-point approach scales linearly with the number of model parameter, it can be applied to large systems for robust experimental planning. AVAILABILITY An implementation of the method in MATLAB/AMPL is available at http://www.uni-magdeburg.de/ivt/svt/person/rf/roed.html. CONTACT flassig@mpi-magdeburg.mpg.de SUPPLEMENTARY INFORMATION Supplementary data are are available at Bioinformatics online.
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153
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Li J, You C, Chen L, Ye Y, Qi Z, Sundmacher K. Dynamics of CO2 Absorption and Desorption Processes in Alkanolamine with Cosolvent Polyethylene Glycol. Ind Eng Chem Res 2012. [DOI: 10.1021/ie301164v] [Citation(s) in RCA: 67] [Impact Index Per Article: 5.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
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154
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Sundmacher K, Hanke-Rauschenbach R, Heidebrecht P, Rihko-Struckmann L, Vidaković-Koch T. Some reaction engineering challenges in fuel cells: dynamics integration, renewable fuels, enzymes. Curr Opin Chem Eng 2012. [DOI: 10.1016/j.coche.2012.02.003] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/28/2022]
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155
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Sundmacher K, Zeng AP. Biosystemtechnik: Design neuer biologischer Produktionssysteme. CHEM-ING-TECH 2012. [DOI: 10.1002/cite.201250570] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/05/2022]
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156
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Freund H, Peschel A, Sundmacher K. Intensivierung des sauerstoffbasierten Ethylenoxid-Prozesses: Optimaler Reaktor für den Gesamtprozess. CHEM-ING-TECH 2012. [DOI: 10.1002/cite.201250157] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022]
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157
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Fricke M, Sundmacher K. Mass transfer model of triethylamine across the n-decane/water interface derived from dynamic interfacial tension experiments. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2012; 28:6803-6815. [PMID: 22475436 DOI: 10.1021/la204413f] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/31/2023]
Abstract
This publication presents a detailed experimental and theoretical study of mass transfer of triethylamine (TEA) across the n-decane/water interface. In preliminary investigations, the partition of TEA between n-decane and water is determined. Based on the experimental finding that the dissociation of TEA takes place in the aqueous and in the organic phase, we assume that the interfacial mass transfer is mainly affected by adsorption and desorption of ionized TEA molecules at the liquid/liquid interface. Due to the amphiphilic structure of the dissociated TEA molecules, a dynamic interfacial tension measurement technique can be used to experimentally determine the interfacial mass transport. A model-based approach, which accounts for diffusive mass transport in the finite liquid bulk phases and for adsorption and desorption of ionized TEA molecules at the interface, is employed to analyze the experimental data. In the equilibrium state, the interfacial tension of dissociated TEA at the n-decane/water interface can be adequately described by the Langmuir isotherm. The comparison between the theoretical and the experimental dynamic interfacial tension data reveals that an additional activation energy barrier for adsorption and desorption at the interface has to be regarded to accurately describe the mass transport of TEA from the n-decane phase into the aqueous phase. Corresponding adsorption rate constants can be obtained by fitting the theoretical predictions to the experimental data. Interfacial tension measurements of mass transfer from the aqueous into the organic phase are characterized by interfacial instabilities caused by Marangoni convection, which result in an enhancement of the transfer rate across the interface.
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158
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Zhou T, Chen L, Ye Y, Chen L, Qi Z, Freund H, Sundmacher K. An Overview of Mutual Solubility of Ionic Liquids and Water Predicted by COSMO-RS. Ind Eng Chem Res 2012. [DOI: 10.1021/ie202719z] [Citation(s) in RCA: 123] [Impact Index Per Article: 10.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
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159
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Borchert C, Sundmacher K. Morphology evolution of crystal populations: Modeling and observation analysis. Chem Eng Sci 2012. [DOI: 10.1016/j.ces.2011.05.057] [Citation(s) in RCA: 36] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/16/2022]
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160
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Heidebrecht P, Hanke-Rauschenbach R, Jörke A, Sundmacher K. On the design of cascades of ECPrOx reactors for deep CO removal from reformate gas. Chem Eng Sci 2012. [DOI: 10.1016/j.ces.2011.07.031] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/15/2022]
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161
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Peschel A, Jörke A, Freund H, Sundmacher K. Model-based development of optimal reaction concepts for plant wide process intensification. COMPUTER AIDED CHEMICAL ENGINEERING 2012. [DOI: 10.1016/b978-0-444-59507-2.50022-6] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 01/21/2023]
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162
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Peschel A, Karst F, Freund H, Sundmacher K. Analysis and optimal design of an ethylene oxide reactor. Chem Eng Sci 2011. [DOI: 10.1016/j.ces.2011.08.054] [Citation(s) in RCA: 47] [Impact Index Per Article: 3.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/25/2022]
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163
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Heidebrecht P, Pfafferodt M, Sundmacher K. Multiscale modelling strategy for structured catalytic reactors. Chem Eng Sci 2011. [DOI: 10.1016/j.ces.2011.03.052] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/18/2022]
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164
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Lu H, Rihko-Struckmann L, Sundmacher K. Spontaneous oscillations of cell voltage, power density, and anode exit CO concentration in a PEM fuel cell. Phys Chem Chem Phys 2011; 13:18179-85. [PMID: 21938289 DOI: 10.1039/c1cp21984g] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
The spontaneous oscillations of the cell voltage and output power density of a PEMFC (with PtRu/C anode) using CO-containing H(2) streams as anodic fuels have been observed during galvanostatic operating. It is ascribed to the dynamic coupling of the CO adsorption (poisoning) and the electrochemical CO oxidation (reactivating) processes in the anode chamber of the single PEMFC. Accompanying the cell voltage and power density oscillations, the discrete CO concentration oscillations at the anode outlet of the PEMFC were also detected, which directly confirms the electrochemical CO oxidation taking place in the anode chamber during galvanostatic operating.
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165
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Fricke M, Sundmacher K. Emulsion-Assisted Nanoparticle Precipitation: Time Scale Analysis and Dynamic Simulation. Ind Eng Chem Res 2011. [DOI: 10.1021/ie2006164] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
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166
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Kadyk T, Hanke-Rauschenbach R, Sundmacher K. Nonlinear frequency response analysis for the diagnosis of carbon monoxide poisoning in PEM fuel cell anodes. J APPL ELECTROCHEM 2011. [DOI: 10.1007/s10800-011-0298-8] [Citation(s) in RCA: 18] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
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167
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Imam RA, Freund H, Sundmacher K. Dynamics of liquid–liquid systems based on linear thermodynamics of irreversible processes. Comput Chem Eng 2011. [DOI: 10.1016/j.compchemeng.2010.06.015] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
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168
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Borchert C, Sundmacher K. Crystal Aggregation in a Flow Tube: Image-Based Observation. Chem Eng Technol 2011. [DOI: 10.1002/ceat.201000465] [Citation(s) in RCA: 39] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/12/2022]
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169
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Kumar R, Katariya A, Freund H, Sundmacher K. Development of a Novel Catalytic Distillation Process for Cyclohexanol Production: Mini Plant Experiments and Complementary Process Simulations. Org Process Res Dev 2011. [DOI: 10.1021/op1001879] [Citation(s) in RCA: 11] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
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170
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Vidaković-Koch T, Ivanov I, Falk M, Shleev S, Ruzgas T, Sundmacher K. Impact of the Gold Support on the Electrocatalytic Oxidation of Sugars at Enzyme-Modified Electrodes. ELECTROANAL 2011. [DOI: 10.1002/elan.201000639] [Citation(s) in RCA: 12] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/12/2022]
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171
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Freund H, Peschel A, Sundmacher K, Sundmacher K. Modellgestützter Reaktorentwurf auf Basis der optimalen Reaktionsführung. CHEM-ING-TECH 2011. [DOI: 10.1002/cite.201000195] [Citation(s) in RCA: 23] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
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172
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Heidebrecht P, Sundmacher K, Biegler LT. Optimal design of nonlinear temperature programmed reduction experiments. AIChE J 2011. [DOI: 10.1002/aic.12485] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/08/2022]
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173
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Heineken W, Flockerzi D, Voigt A, Sundmacher K. Dimension reduction of bivariate population balances using the quadrature method of moments. Comput Chem Eng 2011. [DOI: 10.1016/j.compchemeng.2010.06.012] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/26/2022]
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174
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Hanke-Rauschenbach R, Mangold M, Sundmacher K. Nonlinear dynamics of fuel cells: a review. REV CHEM ENG 2011. [DOI: 10.1515/revce.2011.001] [Citation(s) in RCA: 39] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/15/2022]
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175
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Chen L, Zhou T, Chen L, Ye Y, Qi Z, Freund H, Sundmacher K. Selective oxidation of cyclohexanol to cyclohexanone in the ionic liquid 1-octyl-3-methylimidazolium chloride. Chem Commun (Camb) 2011; 47:9354-6. [DOI: 10.1039/c1cc12989a] [Citation(s) in RCA: 39] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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176
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Chakraborty J, Singh MR, Ramkrishna D, Borchert C, Sundmacher K. Modeling of crystal morphology distributions. Towards crystals with preferred asymmetry. Chem Eng Sci 2010. [DOI: 10.1016/j.ces.2010.03.026] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
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177
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Sundmacher K. Fuel Cell Engineering: Toward the Design of Efficient Electrochemical Power Plants. Ind Eng Chem Res 2010. [DOI: 10.1021/ie100902t] [Citation(s) in RCA: 75] [Impact Index Per Article: 5.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/23/2022]
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178
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Rihko-Struckmann LK, Peschel A, Hanke-Rauschenbach R, Sundmacher K. Assessment of Methanol Synthesis Utilizing Exhaust CO2 for Chemical Storage of Electrical Energy. Ind Eng Chem Res 2010. [DOI: 10.1021/ie100508w] [Citation(s) in RCA: 112] [Impact Index Per Article: 8.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
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179
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Freund H, Kumar R, Katariya A, Sundmacher K. Konzeptioneller Entwurf eines neuen Reaktivdestillationsprozesses zur Herstellung von Cyclohexanol aus Cyclohexen. CHEM-ING-TECH 2010. [DOI: 10.1002/cite.201050309] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/08/2022]
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180
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Adiche C, Sundmacher K. Neuartiges Mikrotrennverfahren zur Separation von Alkohol/Wasser-Gemischen. CHEM-ING-TECH 2010. [DOI: 10.1002/cite.201050336] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/07/2022]
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181
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Borchert C, Sundmacher K. Experimentelle Untersuchung von Aggregation im Strömungsrohr. CHEM-ING-TECH 2010. [DOI: 10.1002/cite.201050057] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
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182
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Klamt S, Flassig RJ, Sundmacher K. TRANSWESD: inferring cellular networks with transitive reduction. ACTA ACUST UNITED AC 2010; 26:2160-8. [PMID: 20605927 PMCID: PMC2922889 DOI: 10.1093/bioinformatics/btq342] [Citation(s) in RCA: 23] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/05/2022]
Abstract
Motivation: Distinguishing direct from indirect influences is a central issue in reverse engineering of biological networks because it facilitates detection and removal of false positive edges. Transitive reduction is one approach for eliminating edges reflecting indirect effects but its use in reconstructing cyclic interaction graphs with true redundant structures is problematic. Results: We present TRANSWESD, an elaborated variant of TRANSitive reduction for WEighted Signed Digraphs that overcomes conceptual problems of existing versions. Major changes and improvements concern: (i) new statistical approaches for generating high-quality perturbation graphs from systematic perturbation experiments; (ii) the use of edge weights (association strengths) for recognizing true redundant structures; (iii) causal interpretation of cycles; (iv) relaxed definition of transitive reduction; and (v) approximation algorithms for large networks. Using standardized benchmark tests, we demonstrate that our method outperforms existing variants of transitive reduction and is, despite its conceptual simplicity, highly competitive with other reverse engineering methods. Contact:klamt@mpi-magdeburg.mpg.de Supplementary information:Supplementary data are available at Bioinformatics online.
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183
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Rollié S, Sundmacher K. Analyse interagierender Partikel-Zell-Systeme mittels Durchflusszytometrie und mehrdimensionalen Populationsbilanzen. CHEM-ING-TECH 2010. [DOI: 10.1002/cite.200900178] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/10/2022]
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184
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Heidebrecht P, Hartono B, Hertel C, Sundmacher K. Biomass-Based Fuel Cell Power Plants: Evaluation of Novel Reactors and Process Designs. Ind Eng Chem Res 2010. [DOI: 10.1021/ie100408n] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
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185
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Peschel A, Freund H, Sundmacher K. Methodology for the Design of Optimal Chemical Reactors Based on the Concept of Elementary Process Functions. Ind Eng Chem Res 2010. [DOI: 10.1021/ie100476q] [Citation(s) in RCA: 83] [Impact Index Per Article: 5.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
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186
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Steyer C, Mangold M, Sundmacher K. Modeling of Particle Size Distribution for Semibatch Precipitation of Barium Sulfate Using Different Activity Coefficient Models. Ind Eng Chem Res 2010. [DOI: 10.1021/ie901306r] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
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187
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Song Y, Sundmacher K. APPROXIMATION OF LAMINAR FLOW FIELD IN RECTANGULAR CHANNELS WITH SUCTION/INJECTION ALONG ONE WALL. CHEM ENG COMMUN 2009. [DOI: 10.1080/00986440903245971] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/20/2022]
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188
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Talwalkar S, Thotla S, Sundmacher K, Mahajani S. Simultaneous Hydrogenation and Isomerization of Diisobutylenes over Pd-Doped Ion-Exchange Resin Catalyst. Ind Eng Chem Res 2009. [DOI: 10.1021/ie9012419] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
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189
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Peschel A, Freund H, Sundmacher K. Systematik zur modellgestützten Ermittlung der optimalen Reaktionsführung am Beispiel der SO 2-Oxidation. CHEM-ING-TECH 2009. [DOI: 10.1002/cite.200950245] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/07/2022]
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190
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Diaz Ochoa J, Voigt A, Sundmacher K. Einfluss der Eigenimmunantwort von Zellpopulationen auf die Optimierung der Impfstoffherstellung. CHEM-ING-TECH 2009. [DOI: 10.1002/cite.200950364] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
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191
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Hartono B, Hertel C, Heidebrecht P, Sundmacher K. Modellbasierter Entwurf eines Brennstoffzellenkraftwerks mit Biomassevergasung. CHEM-ING-TECH 2009. [DOI: 10.1002/cite.200950574] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/10/2022]
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192
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Borchert C, Sundmacher K. Dynamische Modellierung und Simulation von Kristallformverteilungen. CHEM-ING-TECH 2009. [DOI: 10.1002/cite.200950228] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
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193
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Rihko-Struckmann L, Hanke-Rauschenbach R, Peschel A, Sundmacher K. Chemische Speicherung von erneuerbarer Energie durch Reduktion von CO 2. CHEM-ING-TECH 2009. [DOI: 10.1002/cite.200950551] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/10/2022]
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194
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Rollié S, Briesen H, Sundmacher K. Discrete bivariate population balance modelling of heteroaggregation processes. J Colloid Interface Sci 2009; 336:551-64. [DOI: 10.1016/j.jcis.2009.04.031] [Citation(s) in RCA: 19] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/19/2008] [Revised: 02/22/2009] [Accepted: 04/02/2009] [Indexed: 12/01/2022]
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195
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Rollié S, Sundmacher K. Heteroaggregation von Partikeln: Modellgestützte Analyse mittels eigenschaftsdiskreter Populationsbilanzen. CHEM-ING-TECH 2009. [DOI: 10.1002/cite.200950077] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/08/2022]
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196
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Katariya A, Freund H, Sundmacher K. Two-Step Reactive Distillation Process for Cyclohexanol Production from Cyclohexene. Ind Eng Chem Res 2009. [DOI: 10.1021/ie801649v] [Citation(s) in RCA: 27] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
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197
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Radulescu G, Gangadwala J, Paraschiv N, Kienle A, Sundmacher K. Dynamics of reactive distillation processes with potential liquid phase splitting based on equilibrium stage models. Comput Chem Eng 2009. [DOI: 10.1016/j.compchemeng.2008.08.010] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/21/2022]
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198
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John V, Mitkova T, Roland M, Sundmacher K, Tobiska L, Voigt A. Simulations of population balance systems with one internal coordinate using finite element methods. Chem Eng Sci 2009. [DOI: 10.1016/j.ces.2008.05.004] [Citation(s) in RCA: 52] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/16/2022]
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199
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Borchert C, Nere N, Ramkrishna D, Voigt A, Sundmacher K. On the prediction of crystal shape distributions in a steady-state continuous crystallizer. Chem Eng Sci 2009. [DOI: 10.1016/j.ces.2008.05.009] [Citation(s) in RCA: 39] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/22/2022]
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200
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Rollié S, Sundmacher K. Determination of cluster composition in heteroaggregation of binary particle systems by flow cytometry. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2008; 24:13348-13358. [PMID: 18973313 DOI: 10.1021/la8024765] [Citation(s) in RCA: 23] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/27/2023]
Abstract
Cluster composition in aggregation processes of multiple particle species can be dynamically determined by flow cytometry if particle populations are fluorescently labeled. By flow cytometric single particle analysis, aggregates can be characterized according to the exact amount of constituent particles, allowing the detailed and separate quantification of homo- and heteroaggregation. This contribution demonstrates the application of flow cytometry for the experimental detection of heteroaggregation in a binary particle mixture of oppositely charged polystyrene (PS) particles and Rhodamine-B labeled melamine-formaldehyde (MF-RhB) particles. Experiments with different particle concentration, temperature, mixing mode, ionic strength and particle mixing ratio are presented. Aggregation kinetics are enhanced with increasing particle concentration and temperature as well as by increased shear of mixing. These results represent well-known behavior published in previous investigations and validate the performance of flow cytometry for probing heteroaggregation processes. Physical insight with a novel level of detail is gained by the quantification of de- and restabilization phenomena. At low ionic strength, "raspberry"-type aggregates with PS cores are formed by primary heteroaggregation. At moderate particle number ratios, these aggregates are electrostatically destabilized and form more complex aggregates in a secondary heteroaggregation process. At high particle number ratios (> or =50:1), the raspberry-type aggregates are electrostatically restabilized and secondary heteroaggregation is prevented. The dynamic change of aggregate charge was verified by zeta-potential measurements. The elevation of salt concentration over several orders of magnitude retards aggregation dynamics, since attractive interparticle forces are diminished by an electrostatic double layer. This indicates that heteroaggregation induced by attractive interparticle forces is faster than aggregation due to random Brownian motion. Destabilization at high ionic strength is facilitated by charged ions and no longer by MF-RhB coverage. This results in a species independent one step aggregation process.
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