@misc{VarrialeKukaTippkoetteretal.2022, author = {Varriale, Ludovica and Kuka, Katrin and Tippk{\"o}tter, Nils and Ulber, Roland}, title = {Use of a green biomass in a biorefinery platform}, series = {Chemie Ingenieur Technik}, volume = {94}, journal = {Chemie Ingenieur Technik}, number = {9}, publisher = {Wiley-VCH}, address = {Weinheim}, issn = {0009-286X}, doi = {10.1002/cite.202255095}, pages = {1299}, year = {2022}, abstract = {The emerging environmental issues due to the use of fossil resources are encouraging the exploration of new renewable resources. Biomasses are attracting more interest due to the low environmental impacts, low costs, and high availability on earth. In this scenario, green biorefineries are a promising platform in which green biomasses are used as feedstock. Grasses are mainly composed of cellulose and hemicellulose, and lignin is available in a small amount. In this work, a perennial ryegrass was used as feedstock to develop a green bio-refinery platform. Firstly, the grass was mechanically pretreated, thus obtaining a press juice and a press cake fraction. The press juice has high nutritional values and can be employed as part of fermentation media. The press cake can be employed as a substrate either in enzymatic hydrolysis or in solid-state fermentation. The overall aim of this work was to demonstrate different applications of both the liquid and the solid fractions. For this purpose, the filamentous fungus A. niger and the yeast Y. lipolythica were selected for their ability to produce citric acid. Finally, the possibility was assessed to use the press juice as part of fermentation media to cultivate S. cerevisiae and lactic acid bacteria for ethanol and lactic acid fermentation.}, language = {en} } @article{VarrialeHengsbachGuoetal.2024, author = {Varriale, Ludovica and Hengsbach, Jan-Niklas and Guo, Tianyi and Kuka, Katrin and Tippk{\"o}tter, Nils and Ulber, Roland}, title = {Sustainable production of lactic acid using a perennial ryegrass as feedstock—a comparative study of fermentation at the bench- and reactor-scale, and ensiling}, series = {Sustainability}, volume = {16}, journal = {Sustainability}, number = {18}, publisher = {MDPI}, address = {Basel}, issn = {2071-1050}, doi = {10.3390/su16188054}, year = {2024}, abstract = {Perennial ryegrass (Lolium perenne) is an underutilized lignocellulosic biomass that has several benefits such as high availability, renewability, and biomass yield. The grass press-juice obtained from the mechanical pretreatment can be used for the bio-based production of chemicals. Lactic acid is a platform chemical that has attracted consideration due to its broad area of applications. For this reason, the more sustainable production of lactic acid is expected to increase. In this work, lactic acid was produced using complex medium at the bench- and reactor scale, and the results were compared to those obtained using an optimized press-juice medium. Bench-scale fermentations were carried out in a pH-control system and lactic acid production reached approximately 21.84 ± 0.95 g/L in complex medium, and 26.61 ± 1.2 g/L in press-juice medium. In the bioreactor, the production yield was 0.91 ± 0.07 g/g, corresponding to a 1.4-fold increase with respect to the complex medium with fructose. As a comparison to the traditional ensiling process, the ensiling of whole grass fractions of different varieties harvested in summer and autumn was performed. Ensiling showed variations in lactic acid yields, with a yield up to 15.2\% dry mass for the late-harvested samples, surpassing typical silage yields of 6-10\% dry mass.}, language = {en} } @article{UndenBongaerts1997, author = {Unden, Gottfried and Bongaerts, Johannes}, title = {Alternative respiratory pathways of Escherichia coli: energetics and transcriptional regulation in response to electron acceptors}, series = {Biochimica et biophysica acta (BBA) - Bioenergetics}, volume = {Vol. 1320}, journal = {Biochimica et biophysica acta (BBA) - Bioenergetics}, number = {Iss. 3}, issn = {1879-2650 (E-Journal); 0005-2728 (Print)}, pages = {217 -- 234}, year = {1997}, language = {en} } @article{UndenBeckerBongaertsetal.1994, author = {Unden, Gottfried and Becker, S. and Bongaerts, Johannes and Schirawski, Jan and Six, Simon}, title = {Oxygen regulated gene expression in facultatively anaerobic bacteria}, series = {Antonie van Leeuwenhoek}, volume = {Vol. 66}, journal = {Antonie van Leeuwenhoek}, number = {Iss. 1-3}, issn = {0003-6072 (Print) ; 1572-9699 (online)}, pages = {3 -- 22}, year = {1994}, language = {en} } @article{UndenBeckerBongaertsetal.1995, author = {Unden, Gottfried and Becker, S. and Bongaerts, Johannes and Holighaus, G. and Schirawski, Jan and Six, Simon}, title = {O2-sensing and O2-dependent gene regulation in facultatively anaerobic bacteria}, series = {Archives of microbiology}, volume = {Vol. 164}, journal = {Archives of microbiology}, number = {Iss. 2}, issn = {1432-072X (E-Journal); 0003-9276 (Print); 0302-8933 (Print)}, pages = {81 -- 90}, year = {1995}, language = {en} } @article{TuegBaumann1994, author = {T{\"u}g, Helmut and Baumann, Marcus}, title = {Problems of UV-B radiation measurements in biological research : critical remarks on current techniques and suggestions for improvements}, series = {Geophysical research letters}, volume = {Vol. 21}, journal = {Geophysical research letters}, number = {Iss. 8}, issn = {1944-8007 (E-Journal); 0094-8276 (Print)}, pages = {689 -- 692}, year = {1994}, language = {en} } @article{TuegBaumann1995, author = {T{\"u}g, Helmut and Baumann, Marcus}, title = {Reply to the comments by R.L. McKenzie and P.V. Johnston on our paper "Problems of UV-B radiation measurements in biological research: Critical Remarks on current techniques and suggestions for improvements"}, series = {Geophysical research letters}, volume = {Vol. 22}, journal = {Geophysical research letters}, number = {Iss. 9}, issn = {1944-8007 (E-Journal); 0094-8276 (Print)}, pages = {1159 -- 1160}, year = {1995}, language = {en} } @article{TurekKettererClassenetal.2007, author = {Turek, Monika and Ketterer, Lothar and Claßen, Melanie and Berndt, Heinz and Elbers, Gereon and Kr{\"u}ger, Peter and Keusgen, Michael and Sch{\"o}ning, Michael Josef}, title = {Development and Electrochemical Investigations of an EIS-(Electrolyte-Insulator-Semiconductor) based Biosensor for Cyanide Detection}, series = {Sensors}, volume = {7}, journal = {Sensors}, number = {8}, isbn = {1424-8220}, pages = {1415 -- 1426}, year = {2007}, language = {en} } @article{TrappLammersEngudaretal.2023, author = {Trapp, Svenja and Lammers, Tom and Engudar, Gokce and Hoehr, Cornelia and Denkova, Antonia G. and Paulßen, Elisabeth and de Kruijff, Robin M.}, title = {Membrane-based microfluidic solvent extraction of Ga-68 from aqueous Zn solutions: towards an automated cyclotron production loop}, series = {EJNMMI Radiopharmacy and Chemistry}, volume = {2023}, journal = {EJNMMI Radiopharmacy and Chemistry}, number = {8, Article number: 9}, publisher = {Springer Nature}, issn = {2365-421X}, doi = {10.1186/s41181-023-00195-2}, pages = {1 -- 14}, year = {2023}, language = {en} } @article{TranBongaertsVladetal.1997, author = {Tran, Quang Hon and Bongaerts, Johannes and Vlad, Dorina and Unden, Gottfried}, title = {Requirement for the proton-pumping NADH dehydrogenase I of Escherichia coli in respiration of NADH to fumarate and its bioenergetic implications}, series = {European journal of biochemistry}, volume = {Vol. 244}, journal = {European journal of biochemistry}, number = {Iss. 1}, issn = {0014-2956}, pages = {155 -- 160}, year = {1997}, language = {en} }