@article{TippkoetterRoikaewUlberetal.2010,
  author    = {Tippk{\"o}tter, Nils and Roikaew, Wipa and Ulber, Roland and Hoffmann, Alexander and Denzler, Hans-J{\"o}rg and Buchholz, Heinrich},
  title     = {Paracoccus denitrificans for the effluent recycling during continuous denitrification of liquid food},
  series = {Biotechnology Progress},
  volume    = {26},
  journal   = {Biotechnology Progress},
  number    = {3},
  publisher = {Wiley},
  address   = {Hoboken, NJ},
  issn      = {8756-7938},
  doi       = {10.1002/btpr.384},
  pages     = {756 -- 762},
  year      = {2010},
  abstract  = {Nitrate is an undesirable component of several foods. A typical case of contamination with high nitrate contents is whey concentrate, containing nitrate in concentrations up to 25 l. The microbiological removal of nitrate by Paracoccus denitrificans under formation of harmless nitrogen in combination with a cell retention reactor is described here. Focus lies on the resource-conserving design of a microbal denitrification process. Two methods are compared. The application of polyvinyl alcohol-immobilized cells, which can be applied several times in whey feed, is compared with the implementation of a two step denitrification system. First, the whey concentrate's nitrate is removed by ion exchange and subsequently the eluent regenerated by microorganisms under their retention by crossflow filtration. Nitrite and nitrate concentrations were determined by reflectometric color measurement with a commercially available Reflectoquant® device. Correction factors for these media had to be determined. During the pilot development, bioreactors from 4 to 250 mg·L-1 and crossflow units with membrane areas from 0.02 to 0.80 m2 were examined. Based on the results of the pilot plants, a scaling for the exemplary process of denitrifying 1,000 tons per day is discussed.},
  language  = {en}
}
@article{VoigtAlbrechtSieversetal.2015,
  author    = {Voigt, Birgit and Albrecht, Dirk and Sievers, Susanne and Becher, D{\"o}rte and Bongaerts, Johannes and Evers, Stefan and Schweder, Thomas and Maurer, Karl-Heinz and Hecker, Michael},
  title     = {High-resolution proteome maps of Bacillus licheniformis cells growing in minimal medium},
  series = {Proteomics},
  volume    = {15},
  journal   = {Proteomics},
  number    = {15},
  publisher = {Wiley},
  address   = {Weinheim},
  issn      = {1615-9861},
  doi       = {10.1002/pmic.201400504},
  pages     = {2629 -- 2633},
  year      = {2015},
  language  = {en}
}
@incollection{DuweTippkoetterUlber2018,
  author    = {Duwe, A. and Tippk{\"o}tter, Nils and Ulber, Roland},
  title     = {Lignocellulose-Biorefinery: Ethanol-Focused},
  series = {Biorefineries},
  booktitle = {Biorefineries},
  publisher = {Springer},
  address   = {Cham},
  doi       = {10.1007/10_2016_72},
  pages     = {177 -- 215},
  year      = {2018},
  abstract  = {The development prospects of the world markets for petroleum and other liquid fuels are diverse and partly contradictory. However, comprehensive changes for the energy supply of the future are essential. Notwithstanding the fact that there are still very large deposits of energy resources from a geological point of view, the finite nature of conventional oil reserves is indisputable. To reduce our dependence on oil, the EU, the USA, and other major economic zones rely on energy diversification. For this purpose, alternative materials and technologies are being sought, and is most obvious in the transport sector. The objective is to progressively replace fossil fuels with renewable and more sustainable fuels. In this respect, biofuels have a pre-eminent position in terms of their capability of blending with fossil fuels and being usable in existing cars without substantial modification. Ethanol can be considered as the primary renewable liquid fuel. In this chapter enzymes, micro-organisms, and processes for ethanol production based on renewable resources are described.},
  language  = {en}
}
@article{HoffstadtNikolauszKrafftetal.2024,
  author    = {Hoffstadt, Kevin and Nikolausz, Marcell and Krafft, Simone and Bonatelli, Maria and Kumar, Vivekanantha and Harms, Hauke and Kuperjans, Isabel},
  title     = {Optimization of the ex situ biomethanation of hydrogen and carbon dioxide in a novel meandering plug flow reactor: start-up phase and flexible operation},
  series = {Bioengineering},
  volume    = {11},
  journal   = {Bioengineering},
  number    = {2},
  publisher = {MDPI},
  address   = {Basel},
  issn      = {2306-5354},
  doi       = {10.3390/bioengineering11020165},
  pages     = {18 Seiten},
  year      = {2024},
  language  = {en}
}
@article{CheenakulaHoffstadtKrafftetal.2022,
  author    = {Cheenakula, Dheeraja and Hoffstadt, Kevin and Krafft, Simone and Reinecke, Diana and Klose, Holger and Kuperjans, Isabel and Gr{\"o}mping, Markus},
  title     = {Anaerobic digestion of algal-bacterial biomass of an Algal Turf Scrubber system},
  series = {Biomass Conversion and Biorefinery},
  volume    = {13},
  journal   = {Biomass Conversion and Biorefinery},
  publisher = {Springer},
  address   = {Berlin},
  issn      = {2190-6823},
  doi       = {10.1007/s13399-022-03236-z},
  pages     = {15 Seiten},
  year      = {2022},
  abstract  = {This study investigated the anaerobic digestion of an algal-bacterial biofilm grown in artificial wastewater in an Algal Turf Scrubber (ATS). The ATS system was located in a greenhouse (50°54′19ʺN, 6°24′55ʺE, Germany) and was exposed to seasonal conditions during the experiment period. The methane (CH4) potential of untreated algal-bacterial biofilm (UAB) and thermally pretreated biofilm (PAB) using different microbial inocula was determined by anaerobic batch fermentation. Methane productivity of UAB differed significantly between microbial inocula of digested wastepaper, a mixture of manure and maize silage, anaerobic sewage sludge, and percolated green waste. UAB using sewage sludge as inoculum showed the highest methane productivity. The share of methane in biogas was dependent on inoculum. Using PAB, a strong positive impact on methane productivity was identified for the digested wastepaper (116.4\%) and a mixture of manure and maize silage (107.4\%) inocula. By contrast, the methane yield was significantly reduced for the digested anaerobic sewage sludge (50.6\%) and percolated green waste (43.5\%) inocula. To further evaluate the potential of algal-bacterial biofilm for biogas production in wastewater treatment and biogas plants in a circular bioeconomy, scale-up calculations were conducted. It was found that a 0.116 km2 ATS would be required in an average municipal wastewater treatment plant which can be viewed as problematic in terms of space consumption. However, a substantial amount of energy surplus (4.7-12.5 MWh a-1) can be gained through the addition of algal-bacterial biomass to the anaerobic digester of a municipal wastewater treatment plant. Wastewater treatment and subsequent energy production through algae show dominancy over conventional technologies.},
  language  = {en}
}
@incollection{MufflerTippkoetterUlber2010,
  author    = {Muffler, Kai and Tippk{\"o}tter, Nils and Ulber, Roland},
  title     = {Chemical feedstocks and fine chemicals from other substrates},
  series = {Handbook of hydrocarbon and lipid microbiology. Volume 4: Consequences of microbial interactions with hydrocarbons, oils and lipids. - (Springer reference)},
  booktitle = {Handbook of hydrocarbon and lipid microbiology. Volume 4: Consequences of microbial interactions with hydrocarbons, oils and lipids. - (Springer reference)},
  editor    = {Timmis, Kenneth N.},
  publisher = {Springer},
  address   = {Berlin [u.a.]},
  isbn      = {978-3-540-77588-1},
  doi       = {10.1007\%2F978-3-540-77587-4_214},
  pages     = {2891 -- 2902},
  year      = {2010},
  language  = {en}
}
@inproceedings{WulfhorstDuweMoehringetal.2016,
  author    = {Wulfhorst, H. and Duwe, A. and M{\"o}hring, S. and Jurca, O. and Tippk{\"o}tter, Nils},
  title     = {Analysis of pretreated biomass by differential scanning 132 calorimetry and multivariate data analysis},
  series = {New frontiers of biotech-processes (Himmelfahrtstagung) : 02-04 May 2016, Rhein-Mosel-Halle, Koblenz/Germany},
  booktitle = {New frontiers of biotech-processes (Himmelfahrtstagung) : 02-04 May 2016, Rhein-Mosel-Halle, Koblenz/Germany},
  publisher = {DECHEMA},
  address   = {Frankfurt am Main},
  pages     = {132},
  year      = {2016},
  language  = {en}
}
@misc{StadtmuellerTippkoetterUlber2015,
  author    = {Stadtm{\"u}ller, Ralf and Tippk{\"o}tter, Nils and Ulber, Roland},
  title     = {Method for production of single-stranded macronucleotides},
  year      = {2015},
  abstract  = {The invention relates to a method for production of single-stranded macronucleotides by amplifying and ligating an extended monomeric single-stranded target nucleic acid sequence (targetss) into a repetitive cluster of double-stranded target nucleic acid sequences (targetds), and subsequently cloning the construct into a vector (aptagene vector). The aptagene vector is transformed into host cells for replication of the aptagene and isolated in order to optain single-stranded target sequences (targetss). The invention also relates to single-stranded nucleic acids, produced by a method of the invention.},
  language  = {en}
}
@article{GerigkMaassKreutzeretal.2002,
  author    = {Gerigk, M. and Maaß, D. and Kreutzer, A. and Sprenger, G. and Bongaerts, Johannes and Wubbolts, Marcel and Takors, Ralf},
  title     = {Enhanced pilot-scale fed-batch L-phenylalanine production with recombinant Escherichia coli by fully integrated reactive extraction},
  series = {Bioprocess and biosystems engineering},
  volume    = {Vol. 25},
  journal   = {Bioprocess and biosystems engineering},
  number    = {Iss. 1},
  issn      = {1432-0797 (E-Journal); 1615-7605 (E-Journal); 0178-515X (Print); 1615-7591 (Print)},
  pages     = {43 -- 52},
  year      = {2002},
  language  = {en}
}
@article{HafidiElHatkaSchmitzetal.2024,
  author    = {Hafidi, Youssef and El Hatka, Hicham and Schmitz, Dominik and Krauss, Manuel and Pettrak, J{\"u}rgen and Biel, Markus and Ittobane, Najim},
  title     = {Sustainable soil additives for water and micronutrient supply: swelling and chelating properties of polyaspartic acid hydrogels utilizing newly developed crosslinkers},
  series = {Gels},
  volume    = {10},
  journal   = {Gels},
  number    = {3},
  publisher = {MDPI},
  address   = {Basel},
  issn      = {2310-2861},
  doi       = {10.3390/gels10030170},
  pages     = {Artikel 170},
  year      = {2024},
  abstract  = {Drought and water shortage are serious problems in many arid and semi-arid regions. This problem is getting worse and even continues in temperate climatic regions due to climate change. To address this problem, the use of biodegradable hydrogels is increasingly important for the application as water-retaining additives in soil. Furthermore, efficient (micro-)nutrient supply can be provided by the use of tailored hydrogels. Biodegradable polyaspartic acid (PASP) hydrogels with different available (1,6-hexamethylene diamine (HMD) and L-lysine (LYS)) and newly developed crosslinkers based on diesters of glycine (GLY) and (di-)ethylene glycol (DEG and EG, respectively) were synthesized and characterized using Fourier transform infrared (FTIR) spectroscopy and scanning electron microscopy (SEM) and regarding their swelling properties (kinetic, absorbency under load (AUL)) as well as biodegradability of PASP hydrogel. Copper (II) and zinc (II), respectively, were loaded as micronutrients in two different approaches: in situ with crosslinking and subsequent loading of prepared hydrogels. The results showed successful syntheses of di-glycine-ester-based crosslinkers. Hydrogels with good water-absorbing properties were formed. Moreover, the developed crosslinking agents in combination with the specific reaction conditions resulted in higher water absorbency with increased crosslinker content used in synthesis (10\% vs. 20\%). The prepared hydrogels are candidates for water-storing soil additives due to the biodegradability of PASP, which is shown in an exemple. The incorporation of Cu(II) and Zn(II) ions can provide these micronutrients for plant growth.},
  language  = {en}
}