@article{WissenbachSixBongaertsetal.1995,
  author    = {Wissenbach, U. and Six, S. and Bongaerts, Johannes and Ternes, D. and Steinwachs, S. and Unden, G.},
  title     = {A third periplasmic transport system for l-arginine in Escherichia coli: molecular characterization of the artPIQMJ genes, arginine binding and transport},
  series = {Molecular microbiology},
  volume    = {Vol. 17},
  journal   = {Molecular microbiology},
  number    = {Iss. 4},
  issn      = {1365-2958 (E-Journal); 0950-382x (Print)},
  pages     = {675 -- 686},
  year      = {1995},
  language  = {en}
}
@misc{StadtmuellerTippkoetterUlber2013,
  author    = {Stadtm{\"u}ller, Ralf and Tippk{\"o}tter, Nils and Ulber, Roland},
  title     = {A method for production of single-stranded nucleic acids [Europ{\"a}ische Patentanmeldung]},
  publisher = {Europ{\"a}isches Patentamt},
  address   = {Den Hague},
  pages     = {14 Seiten},
  year      = {2013},
  language  = {en}
}
@misc{HuschyarTippkoetterUlber2015,
  author    = {Huschyar, Al-Kaidy and Tippk{\"o}tter, Nils and Ulber, Roland},
  title     = {System und Verfahren zur Durchf{\"u}hrung von chemischen, biologischen oder physikalischen Reaktionen},
  year      = {2015},
  language  = {de}
}
@article{ThielMufflerTippkoetteretal.2015,
  author    = {Thiel, Alexander and Muffler, Kai and Tippk{\"o}tter, Nils and Suck, Kirstin and Sohling, Ulrich and Hruschka, Steffen M. and Ulber, Roland},
  title     = {A novel integrated downstream processing approach to recover sinapic acid, phytic acid and proteins from rapeseed meal},
  series = {Journal of Chemical Technology and Biotechnology},
  volume    = {90},
  journal   = {Journal of Chemical Technology and Biotechnology},
  number    = {11},
  publisher = {Wiley},
  address   = {Weinheim},
  doi       = {10.1002/jctb.4664},
  pages     = {1999 -- 2006},
  year      = {2015},
  abstract  = {BACKGROUND Currently, several techniques exist for the downstream processing of protein, phytic acid and sinapic acid from rapeseed and rapeseed meal, but no technique has been developed to separate all of the components in one process. In this work, two new downstream processing strategies focusing on recovering sinapic acid, phytic acid and protein from rapeseed meal were established. RESULTS The sinapic acid content was enhanced by a factor of 4.5 with one method and 5.1 with the other. The isolation of sinapic acid was accomplished using a zeolite-based adsorbent with high adsorptive and optimal desorption characteristics. Phytic acid was isolated using the anion-exchange resin Purolite A200®. In addition, the processes resulted in two separated protein fractions. The ratios of globulin and albumin ratio to the total protein were 59.2\% and 40.1\%, respectively. The steps were then combined in two different ways: (a) a 'sequential process' using the zeolite and A200 in batch processes; and (b) a 'parallel process' using only A200 in a chromatographic system to separate all of the compounds. CONCLUSIONS It can be concluded that isolation of all three components was possible in both processes. These could enhance the added value of current processes using rapeseed meal as a protein source. © 2015 Society of Chemical Industry},
  language  = {en}
}
@article{AlKaidyTippkoetter2016,
  author    = {Al-Kaidy, Huschyar and Tippk{\"o}tter, Nils},
  title     = {Superparamagnetic hydrophobic particles as shell material for digital microfluidic droplets and proof-of-principle reaction assessments with immobilized laccase},
  series = {Engineering in Life Sciences},
  volume    = {16},
  journal   = {Engineering in Life Sciences},
  number    = {3},
  publisher = {Wiley-VCH},
  address   = {Weinheim},
  doi       = {10.1002/elsc.201400124},
  pages     = {222 -- 230},
  year      = {2016},
  abstract  = {In the field of biotechnology and molecular biology, the use of small liquid volumes has significant advantages. In particular, screening and optimization runs with acceptable amounts of expensive and hardly available catalysts, reagents, or biomolecules are feasible with microfluidic technologies. The presented new microfluidic system is based on the inclusion of small liquid volumes by a protective shell of magnetizable microparticles. Hereby, discrete aqueous microreactor drops with volumes of 1-30 μL can be formed on a simple planar surface. A digital movement and manipulation of the microreactor is performed by overlapping magnetic forces. The magnetic forces are generated by an electrical coil matrix positioned below a glass plate. With the new platform technology, several discrete reaction compartments can be moved simultaneously on one surface. Due to the magnetic fields, the reactors can even be merged to initiate reactions by mixing or positioned above surface-immobilized catalysts and then opened by magnetic force. Comparative synthesis routes of the magnetizable shell particles and superhydrophobic glass slides including their performance and stability with the reaction platform are described. The influence of diffusive mass transport during the catalyzed reaction is discussed by evaluation finite element model of the microreactor. Furthermore, a first model dye reaction of the enzyme laccase has been established.},
  language  = {en}
}
@article{EngelBayerHoltmannetal.2019,
  author    = {Engel, Mareike and Bayer, Hendrik and Holtmann, Dirk and Tippk{\"o}tter, Nils and Ulber, Roland},
  title     = {Flavin secretion of Clostridium acetobutylicum in a bioelectrochemical system - Is an iron limitation involved?},
  series = {Bioelectrochemistry},
  journal   = {Bioelectrochemistry},
  number    = {In Press, Accepted Manuscript},
  publisher = {Elsevier},
  address   = {Amsterdam},
  issn      = {1567-5394},
  doi       = {10.1016/j.bioelechem.2019.05.014},
  year      = {2019},
  language  = {en}
}
@misc{TippkoetterUlber2009,
  author    = {Tippk{\"o}tter, Nils and Ulber, Roland},
  title     = {Eine magnetische horizontale Wirbelschicht f{\"u}r die Durchmischung und R{\"u}ckhaltung von magnetisierbaren Mikropartikeln im Durchfluss},
  series = {Chemie Ingenieur Technik},
  volume    = {81},
  journal   = {Chemie Ingenieur Technik},
  number    = {8},
  publisher = {Wiley-VCH},
  address   = {Weinheim},
  issn      = {0009-286X},
  doi       = {10.1002/cite.200950076},
  pages     = {1168},
  year      = {2009},
  abstract  = {Magnetisierbare Partikel als Tr{\"a}ger von Katalysatoren k{\"o}nnen durch Anlegen eines magnetisches Feldes einfach und schnell abgetrennt werden. Die Wiedergewinnung von wertvollen Enzymen unter geringem Energie- und Materialeinsatz der magnetischen Abtrennung er{\"o}ffnet einen Wettbewerbsvorteil f{\"u}r Produktionsprozesse. Die Abtrennung von magnetisierbaren Partikeln vom {\"U}berstand wird {\"u}blicherweise entweder durch Anlegen eines {\"a}ußeren Magnetfelds und der resultierenden Ablagerung der Partikel an den Reaktorw{\"a}nden oder durch Hochgradientenmagnetseparation (HGMS)durchgef{\"u}hrt. Beide Verfahren resultieren meist in der Bildung eines Filterkuchens aus Magnetpartikeln und den Feststoffen des Reaktionsmediums. Das magnetische horizontale Wirbelbett erm{\"o}glicht simultan eine kontinuierliche Reaktionsf{\"u}hrung und die R{\"u}ckhaltung der Partikel im Durchfluss. Die Partikelsuspension fließt durch einen Rohrreaktor, der in einem Magnetfeld mit wechselnden Feldgradienten eingebracht ist. Die {\"A}nderung des Magnetfeldgradienten erfolgt entgegen der Str{\"o}mungsrichtung der Reaktionsl{\"o}sung. Durch alternierende Feldmaxima an den beiden Seiten des Reaktors werden die magnetisierbaren Partikel zu dessen W{\"a}nden gezogen. Bei Umkehrung des Feldes wandern die Partikel an die gegen{\"u}berliegende Reaktorwand. Durch Wahl einer geeigneten Wechselfrequenz kann eine kontinuierliche Durchmischung und R{\"u}ckhaltung der Mikropartikel im durchstr{\"o}mten Rohr erreicht werden. Somit k{\"o}nnen Immobilisierungsreaktionen und Biotransformationen mit den Partikelsystemen im Durchfluss durchgef{\"u}hrt werden.},
  language  = {en}
}
@article{SiekerNeunerDimitrovaetal.2010,
  author    = {Sieker, Tim and Neuner, Andreas and Dimitrova, Darina and Tippk{\"o}tter, Nils and Bart, Hans-J{\"o}rg and Heinzle, Elmar and Ulber, Roland},
  title     = {Grassilage als Rohstoff f{\"u}r die chemische Industrie},
  series = {Chemie Ingenieur Technik},
  volume    = {82},
  journal   = {Chemie Ingenieur Technik},
  number    = {8, Special Issue: Industrielle Nutzung nachwachsender Rohstoffe},
  publisher = {Wiley-VCH},
  address   = {Weinheim},
  issn      = {1522-2640},
  doi       = {10.1002/cite.201000088},
  pages     = {1153 -- 1159},
  year      = {2010},
  abstract  = {Grassilage stellt einen nachwachsenden Rohstoff mit großem Potenzial dar. Neben Cellulose und Hemicellulose enth{\"a}lt sie auch organische S{\"a}uren, insbesondere Milchs{\"a}ure. In einem Bioraffinerie-Projekt wird die Milchs{\"a}ure aus der Silage isoliert und mit gentechnisch optimierten St{\"a}mmen zu L-Lysin weiterverarbeitet. Die Lignocellulose wird hydrolysiert und zu Ethanol fermentiert. Ein besonderes Augenmerk liegt auf der Integration der unterschiedlichen Prozesse sowie der einzelnen Prozessschritte zu einem Gesamtprozess, der s{\"a}mtliche Inhaltsstoffe der Silage verwertet.},
  language  = {de}
}
@article{SiekerNeunerDimitrovaetal.2011,
  author    = {Sieker, Tim and Neuner, Andreas and Dimitrova, Darina and Tippk{\"o}tter, Nils and Muffler, Kai and Bart, Hans-J{\"o}rg and Heinzle, Elmar and Ulber, Roland},
  title     = {Ethanol production from grass silage by simultaneous pretreatment, saccharification and fermentation: First steps in the process development},
  series = {Engineering in Life Sciences},
  volume    = {11},
  journal   = {Engineering in Life Sciences},
  number    = {4},
  publisher = {Wiley},
  address   = {Weinheim},
  doi       = {10.1002/elsc.201000160},
  pages     = {436 -- 442},
  year      = {2011},
  abstract  = {Grass silage provides a great potential as renewable feedstock. Two fractions of the grass silage, a press juice and the fiber fraction, were evaluated for their possible use for bioethanol production. Direct production of ethanol from press juice is not possible due to high concentrations of organic acids. For the fiber fraction, alkaline peroxide or enzymatic pretreatment was used, which removes the phenolic acids in the cell wall. In this study, we demonstrate the possibility to integrate the enzymatic pretreatment with a simultaneous saccharification and fermentation to achieve ethanol production from grass silage in a one-process step. Achieved yields were about 53 g ethanol per kg silage with the alkaline peroxide pretreatment and 91 g/kg with the enzymatic pretreatment at concentrations of 8.5 and 14.6 g/L, respectively. Furthermore, it was shown that additional supplementation of the fermentation medium with vitamins, trace elements and nutrient salts is not necessary when the press juice is directly used in the fermentation step.},
  language  = {en}
}
@article{CapitainWagnerHummeletal.2021,
  author    = {Capitain, Charlotte and Wagner, Sebastian and Hummel, Joana and Tippk{\"o}tter, Nils},
  title     = {Investigation of C-N Formation Between Catechols and Chitosan for the Formation of a Strong, Novel Adhesive Mimicking Mussel Adhesion},
  series = {Waste and Biomass Valorization},
  volume    = {12},
  journal   = {Waste and Biomass Valorization},
  publisher = {Springer Nature},
  address   = {Cham},
  issn      = {1877-265X},
  doi       = {10.1007/s12649-020-01110-5},
  pages     = {1761 -- 1779},
  year      = {2021},
  language  = {en}
}
@misc{TippkoetterSiekerWiesenetal.2014,
  author    = {Tippk{\"o}tter, Nils and Sieker, T. and Wiesen, S. and Duwe, A. and Roth, J. and Ulber, Roland},
  title     = {Simultane Saccharifizierung und Fermentierung (SSF) sowie Produktion von Aceton, Butanol, Ethanol (ABE) und Dicarbons{\"a}uren aus technischer Cellulose},
  series = {Chemie Ingenieur Technik},
  volume    = {86},
  journal   = {Chemie Ingenieur Technik},
  number    = {9},
  publisher = {Wiley-VCH},
  address   = {Weinheim},
  issn      = {0009-286X},
  doi       = {10.1002/cite.201450297},
  pages     = {1518},
  year      = {2014},
  abstract  = {Technische Cellulose wurde als m{\"o}glicher Rohstoff zur fermentativen Produktbildung untersucht. Hierf{\"u}r wird Cellulose in der Lignocellulose-Bioraffinerie hergestellt und daraus Hydrolysat gewonnen. Die Pr{\"u}fung der technischen Hydrolysate als Substrate erfolgte anhand eines breiten Spektrums an Bioprodukten, von Kraftstoffen wie Ethanolund Butanol, bis zu den Dicarbons{\"a}uren Itacon- und Bernsteins{\"a}ure. Dabei werden Bakterien, Hefen und Pilze als Produktionsorganismen eingesetzt. Die einzelnen Herstellverfahren stellen unterschiedliche Anforderungen an die Substrathandhabung. Im Fall der Ethanol- und Butanol-Gewinnung kann eine simultane Saccharifizierung und Fermentierung (SSF) durchgef{\"u}hrt werden. Aufgrund der Produkttoxizit{\"a}t erfordert die Butanol-Herstellung dabei eine In-situ-Produktabtrennung durch L{\"o}semittelimpr{\"a}gnierte Partikel. Die Herstellung der beiden Dicarbons{\"a}uren unterscheidet sich in der Sensitivit{\"a}t der verwendeten Mikroorganismen gegen{\"u}ber Inhibitoren, die in Spuren im Hydrolysat enthalten sind. Die Bernteins{\"a}urebildung mit Actinobacillussuccinogenes kann mit unbehandeltem Hydrolysat erfolgen. Dagegen erfordert die Gewinnung von Itacons{\"a}ure mit A. terreus eine Detoxifizierung des Hydrolysats. Insgesamt konnte gezeigt werden, dass s{\"a}mtliche Bioraffinerie-Hydrolysate als Substrate f{\"u}r unterschiedliche Fermentationen geeignet sind.},
  language  = {de}
}
@article{HandtkeSchroeterJuergenetal.2014,
  author    = {Handtke, Stefan and Schroeter, Rebecca and J{\"u}rgen, Britta and Methling, Karen and Schl{\"u}ter, Rabea and Albrecht, Dirk and Hijum, Sacha A. F. T. van and Bongaerts, Johannes and Maurer, Karl-Heinz and Lalk, Michael and Schweder, Thomas and Hecker, Michael and Voigt, Birgit},
  title     = {Bacillus pumilus reveals a remarkably high resistance to hydrogen peroxide provoked oxidative stress},
  series = {PLOS one},
  volume    = {9},
  journal   = {PLOS one},
  number    = {1},
  publisher = {PLOS},
  address   = {San Francisco},
  issn      = {1932-6203},
  doi       = {10.1371/journal.pone.0085625},
  pages     = {e85625},
  year      = {2014},
  abstract  = {Bacillus pumilus is characterized by a higher oxidative stress resistance than other comparable industrially relevant Bacilli such as B. subtilis or B. licheniformis. In this study the response of B. pumilus to oxidative stress was investigated during a treatment with high concentrations of hydrogen peroxide at the proteome, transcriptome and metabolome level. Genes/proteins belonging to regulons, which are known to have important functions in the oxidative stress response of other organisms, were found to be upregulated, such as the Fur, Spx, SOS or CtsR regulon. Strikingly, parts of the fundamental PerR regulon responding to peroxide stress in B. subtilis are not encoded in the B. pumilus genome. Thus, B. pumilus misses the catalase KatA, the DNA-protection protein MrgA or the alkyl hydroperoxide reductase AhpCF. Data of this study suggests that the catalase KatX2 takes over the function of the missing KatA in the oxidative stress response of B. pumilus. The genome-wide expression analysis revealed an induction of bacillithiol (Cys-GlcN-malate, BSH) relevant genes. An analysis of the intracellular metabolites detected high intracellular levels of this protective metabolite, which indicates the importance of bacillithiol in the peroxide stress resistance of B. pumilus.},
  language  = {en}
}
@misc{GrafSteinhofLotzetal.2009,
  author    = {Graf, Alain-Michel and Steinhof, Rafael and Lotz, Martin and Tippk{\"o}tter, Nils and Kasper, Cornelia and Beutel, Sascha and Ulber, Roland},
  title     = {Downstream-Processing mit Membranadsorbern zur Isolierung nativer Proteinfraktionen aus Kartoffelfruchtwasser},
  series = {Chemie Ingenieur Technik},
  volume    = {81},
  journal   = {Chemie Ingenieur Technik},
  number    = {3},
  publisher = {Wiley},
  address   = {Weinheim},
  doi       = {10.1002/cite.200800139},
  pages     = {267 -- 274},
  year      = {2009},
  abstract  = {Bei der St{\"a}rkeproduktion entstehendes Kartoffelfruchtwasser besitzt mit 2 - 3 \% einen hohen Anteil an ern{\"a}hrungsphysiologisch interessanten Proteinen. Die industrielle Gewinnung dieser Proteinfracht liefert jedoch lediglich ein minderwertiges, denaturiertes Produkt. Mit Hilfe der Membranadsorber-Technologie lassen sich aus Kartoffelfruchtwasser unter milden Reaktionsbedingungen native bioaktive Proteinfraktionen gewinnen. Geeignete Trennbedingungen wurden im Labormaßstab entwickelt und in den Technikumsmaßstab {\"u}bertragen. An Anionenaustauscher-Membranadsorbern mit einer Membranfl{\"a}che von 10 000 cm2 wurde eine Patatinhaltige Fraktion (44 kDa) mit Bindungskapazit{\"a}ten von 0,37 mg/cm2 isoliert. Eine niedermolekulare Proteinfraktion mit Protease-Inhibitoren konnte durch Kationenaustauscher-Membranadsorber mit Bindungskapazit{\"a}ten von 1,00 mg/cm2 gewonnen werden. Sie ist f{\"u}r verschiedenste Applikationen in der pharmazeutischen, kosmetischen und der Nahrungsmittelindustrie interessant z. B. f{\"u}r Appetitz{\"u}gler oder muskelaufbauende Proteinpr{\"a}parate. Der Aufreinigung der nativen Proteinfraktionen durch Ultra-/Diafiltration schließt sich die Konfektionierung durch Spr{\"u}htrocknung an. Die bioanalytische Charakterisierung der Produkte belegt die Reinheit und die enzymatische Aktivit{\"a}t sowie die Abreicherung von St{\"o}rkomponenten wie Glykoalkaloide und Polyphenoloxidasen.},
  language  = {de}
}
@article{KapplerTanudyayaSchmittTippkoetteretal.2007,
  author    = {Kappler-Tanudyaya, Nathalie and Schmitt, Heike and Tippk{\"o}tter, Nils and Meyer, Lina and Lenzen, Sigurd and Ulber, Roland},
  title     = {Combination of biotransformation and chromatography for the isolation and purification of mannoheptulose},
  series = {Biotechnology Journal},
  volume    = {2},
  journal   = {Biotechnology Journal},
  number    = {6},
  issn      = {1860-7314},
  doi       = {10.1002/biot.200700004},
  pages     = {692 -- 699},
  year      = {2007},
  abstract  = {Mannoheptulose is a seven-carbon sugar. It is an inhibitor of glucose-induced insulin secretion due to its ability to selectively inhibit the enzyme glucokinase. An improved procedure for mannoheptulose isolation from avocados is described in this study (based upon the original method by La Forge). The study focuses on the combination of biotransformation and downstream processing (preparative chromatography) as an efficient method to produce a pure extract of mannoheptulose. The experiments were divided into two major phases. In the first phase, several methods and parameters were compared to optimize the mannoheptulose extraction with respect to efficiency and purity. In the second phase, a mass balance of mannoheptulose over the whole extraction process was undertaken to estimate the yield and efficiency of the total extraction process. The combination of biotransformation and preparative chromatography allowed the production of a pure mannoheptulose extract. In a biological test, the sugar inhibited the glucokinase enzyme activity efficiently.},
  language  = {en}
}
@article{MuschallikKippReckeretal.2020,
  author    = {Muschallik, Lukas and Kipp, Carina Ronja and Recker, Inga and Bongaerts, Johannes and Pohl, Martina and Gelissen, Melanie and Sch{\"o}ning, Michael Josef and Selmer, Thorsten and Siegert, Petra},
  title     = {Synthesis of α-hydroxy ketones and vicinal diols with the Bacillus licheniformis DSM 13T butane-2, 3-diol dehydrogenase},
  series = {Journal of Biotechnology},
  volume    = {202},
  journal   = {Journal of Biotechnology},
  number    = {Vol. 324},
  publisher = {Elsevier},
  address   = {Amsterdam},
  isbn      = {2590-1559},
  doi       = {10.1016/j.jbiotec.2020.09.016},
  pages     = {61 -- 70},
  year      = {2020},
  abstract  = {The enantioselective synthesis of α-hydroxy ketones and vicinal diols is an intriguing field because of the broad applicability of these molecules. Although, butandiol dehydrogenases are known to play a key role in the production of 2,3-butandiol, their potential as biocatalysts is still not well studied. Here, we investigate the biocatalytic properties of the meso-butanediol dehydrogenase from Bacillus licheniformis DSM 13T (BlBDH). The encoding gene was cloned with an N-terminal StrepII-tag and recombinantly overexpressed in E. coli. BlBDH is highly active towards several non-physiological diketones and α-hydroxyketones with varying aliphatic chain lengths or even containing phenyl moieties. By adjusting the reaction parameters in biotransformations the formation of either the α-hydroxyketone intermediate or the diol can be controlled.},
  language  = {en}
}
@book{ArtmannTemizArtmannZhubanovaetal.2018,
  author    = {Artmann, Gerhard and Temiz Artmann, Ayseg{\"u}l and Zhubanova, Azhar A. and Digel, Ilya},
  title     = {Biological, physical and technical basics of cell engineering},
  editor    = {Artmann, Gerhard and Temiz Artmann, Ayseg{\"u}l and Zhubanova, Azhar A. and Digel, Ilya},
  publisher = {Springer},
  address   = {Singapore},
  isbn      = {978-981-10-7903-0},
  pages     = {xxiv, 481 Seiten ; Illustrationen, Diagramme},
  year      = {2018},
  language  = {en}
}
@article{JablonskiMuenstermannNorketal.2021,
  author    = {Jablonski, Melanie and M{\"u}nstermann, Felix and Nork, Jasmina and Molinnus, Denise and Muschallik, Lukas and Bongaerts, Johannes and Wagner, Torsten and Keusgen, Michael and Siegert, Petra and Sch{\"o}ning, Michael Josef},
  title     = {Capacitive field-effect biosensor applied for the detection of acetoin in alcoholic beverages and fermentation broths},
  series = {physica status solidi (a) applications and materials science},
  volume    = {218},
  journal   = {physica status solidi (a) applications and materials science},
  number    = {13},
  publisher = {Wiley-VCH},
  address   = {Weinheim},
  issn      = {1862-6319},
  doi       = {10.1002/pssa.202000765},
  pages     = {7 Seiten},
  year      = {2021},
  abstract  = {An acetoin biosensor based on a capacitive electrolyte-insulator-semiconductor (EIS) structure modified with the enzyme acetoin reductase, also known as butane-2,3-diol dehydrogenase (Bacillus clausii DSM 8716ᵀ), is applied for acetoin detection in beer, red wine, and fermentation broth samples for the first time. The EIS sensor consists of an Al/p-Si/SiO₂/Ta₂O₅ layer structure with immobilized acetoin reductase on top of the Ta₂O₅ transducer layer by means of crosslinking via glutaraldehyde. The unmodified and enzyme-modified sensors are electrochemically characterized by means of leakage current, capacitance-voltage, and constant capacitance methods, respectively.},
  language  = {en}
}
@article{KraemerBongaertsBovenbergetal.2003,
  author    = {Kr{\"a}mer, Marco and Bongaerts, Johannes and Bovenberg, Roel and Kremer, Susanne and M{\"u}ller, Ulrike and Orf, Sonja and Wubbolts, Marcel and Raeven, Leon},
  title     = {Metabolic engineering for microbial production of shikimic acid},
  series = {Metabolic engineering},
  volume    = {Vol. 5},
  journal   = {Metabolic engineering},
  number    = {Iss. 4},
  issn      = {1096-7184 (E-Journal); 1096-7176 (Print)},
  pages     = {277 -- 283},
  year      = {2003},
  language  = {en}
}
@article{HoffstadtCheenakulaNikolauszetal.2023,
  author    = {Hoffstadt, Kevin and Cheenakula, Dheeraja and Nikolausz, Marcell and Krafft, Simone and Harms, Hauke and Kuperjans, Isabel},
  title     = {Design and construction of a new reactor for flexible biomethanation of hydrogen},
  series = {Fermentation},
  volume    = {9},
  journal   = {Fermentation},
  number    = {8},
  publisher = {MDPI},
  address   = {Basel},
  issn      = {2311-5637},
  doi       = {10.3390/fermentation9080774},
  pages     = {1 -- 16},
  year      = {2023},
  abstract  = {The increasing share of renewable electricity in the grid drives the need for sufficient storage capacity. Especially for seasonal storage, power-to-gas can be a promising approach. Biologically produced methane from hydrogen produced from surplus electricity can be used to substitute natural gas in the existing infrastructure. Current reactor types are not or are poorly optimized for flexible methanation. Therefore, this work proposes a new reactor type with a plug flow reactor (PFR) design. Simulations in COMSOL Multiphysics ® showed promising properties for operation in laminar flow. An experiment was conducted to support the simulation results and to determine the gas fraction of the novel reactor, which was measured to be 29\%. Based on these simulations and experimental results, the reactor was constructed as a 14 m long, 50 mm diameter tube with a meandering orientation. Data processing was established, and a step experiment was performed. In addition, a kLa of 1 h-1 was determined. The results revealed that the experimental outcomes of the type of flow and gas fractions are in line with the theoretical simulation. The new design shows promising properties for flexible methanation and will be tested.},
  language  = {en}
}
@article{CapitainRossJonesMoehringetal.2020,
  author    = {Capitain, Charlotte and Ross-Jones, Jesse and M{\"o}hring, Sophie and Tippk{\"o}tter, Nils},
  title     = {Differential scanning calorimetry for quantification of polymer biodegradability in compost},
  series = {International Biodeterioration \& Biodegradation},
  volume    = {149},
  journal   = {International Biodeterioration \& Biodegradation},
  publisher = {Elsevier},
  address   = {Amsterdam},
  issn      = {0964-8305},
  doi       = {10.1016/j.ibiod.2020.104914},
  pages     = {In Press, Article number 104914},
  year      = {2020},
  abstract  = {The objective of this study is the establishment of a differential scanning calorimetry (DSC) based method for online analysis of the biodegradation of polymers in complex environments. Structural changes during biodegradation, such as an increase in brittleness or crystallinity, can be detected by carefully observing characteristic changes in DSC profiles. Until now, DSC profiles have not been used to draw quantitative conclusions about biodegradation. A new method is presented for quantifying the biodegradation using DSC data, whereby the results were validated using two reference methods. The proposed method is applied to evaluate the biodegradation of three polymeric biomaterials: polyhydroxybutyrate (PHB), cellulose acetate (CA) and Organosolv lignin. The method is suitable for the precise quantification of the biodegradability of PHB. For CA and lignin, conclusions regarding their biodegradation can be drawn with lower resolutions. The proposed method is also able to quantify the biodegradation of blends or composite materials, which differentiates it from commonly used degradation detection methods.},
  language  = {en}
}