@inproceedings{PeterVaterLangendoerfer, author = {Peter, Steffen and Vater, Frank and Langend{\"o}rfer, Peter}, title = {Sicherheits-Engineering am Beispiel von drahtlos angebundenen Sensor/Aktor-Systemen in der Automatisierungstechnik}, language = {de} } @inproceedings{VaterPeterLangendoerfer, author = {Vater, Frank and Peter, Steffen and Langend{\"o}rfer, Peter}, title = {An On-Chip Security Monitoring Solution for System Clock for Low Cost Devices}, language = {en} } @misc{PeterMethfesselVateretal., author = {Peter, Steffen and Methfessel, Michael and Vater, Frank and Langend{\"o}rfer, Peter}, title = {Reduktion von Seiten-Kanal-Informationen durch interagierende Krypto-Blocks}, language = {en} } @misc{PeterMethfesselLangendoerferetal., author = {Peter, Steffen and Methfessel, Michael and Langend{\"o}rfer, Peter and Vater, Frank}, title = {Reduktion von Seiten-Kanal-Informationen durch interagierende Krypto-Blocks}, language = {de} } @misc{AllertzBergerSellenketal., author = {Allertz, Peter J. and Berger, Steffen and Sellenk, Grit and Dittmer, Christin and Dietze, Marco and Stahmann, Klaus-Peter and Salchert, Katrin}, title = {Approaching Immobilization of Enzymes onto Open Porous Basotect®}, series = {Catalysts}, volume = {7}, journal = {Catalysts}, number = {12}, issn = {2073-4344}, doi = {10.3390/catal7120359}, pages = {21}, abstract = {For the first time, commercial macroporous melamine formaldehyde foam Basotect® (BT) was used as a basic carrier material for both adsorptive and covalent enzyme immobilization. In order to access inherent amino groups, the Basotect® surface was pretreated with hydrochloric acid. The resulting material revealed 6 nmol of superficial amino groups per milligram Basotect®. Different optimized strategies for tethering the laccase from Trametes versicolor and the lipase from Thermomyces lanuginosus onto the pre-treated Basotect® surface were studied. Particularly, for covalent immobilization, two different strategies were pursued: lipase was tethered via a cross-linking method using 1-ethyl-3-(3-dimethylaminopropyl)carbodiimide, and laccase was bound after functionalizing Basotect® with hydrophilic copolymer poly(ethylene-alt-maleic anhydride) (PEMA). Prior to laccase immobilization, the PEMA coating of Basotect® was verified by ATR-FTIR analysis. Subsequent quantification of available high-reactive PEMA anhydride moieties revealed an amount of 1028 ± 73 nmol per mg Basotect®. The surface-bound enzyme amounts were quantified as 4.1-5.8 μg per mg Basotect®. A theoretical surface-covered enzyme mass for the ideal case that an enzyme monolayer was immobilized onto the Basotect® surface was calculated and compared to the amount of adsorptive and covalently bound enzymes before and after treatment with SDS. Furthermore, the enzyme activities were determined for the different immobilization approaches, and the stability during storage over time and against sodium dodecyl sulfate treatment was monitored. Additionally, PEMA-BT-bound laccase was tested for the elimination of anthropogenic micropollutant bisphenol A from contaminated water in a cost-effective and environmentally-friendly way and resulted in a degradation rate higher than 80\%.}, language = {en} } @misc{VaterJagdholdPeteretal., author = {Vater, Frank and Jagdhold, Ulrich and Peter, Steffen and Langend{\"o}rfer, Peter}, title = {Takt{\"u}berwachungsschaltung}, language = {de} } @misc{VaterPeterJagdholdetal., author = {Vater, Frank and Peter, Steffen and Jagdhold, Ulrich and Langend{\"o}rfer, Peter}, title = {Erweiterter Clock Watchdog}, language = {de} } @misc{VaterPeterJagdholdetal., author = {Vater, Frank and Peter, Steffen and Jagdhold, Ulrich and Langend{\"o}rfer, Peter}, title = {Verschl{\"u}sselungseinheit}, language = {de} } @misc{LangendoerferPiotrowskiPeteretal., author = {Langend{\"o}rfer, Peter and Piotrowski, Krzysztof and Peter, Steffen and Lehmann, Martin}, title = {Crosslayer Firewall Interaction as a Means to Provide Effective and Efficient Protection at Mobile Devices}, language = {en} } @article{VaterPeterLangendoerfer, author = {Vater, Frank and Peter, Steffen and Langend{\"o}rfer, Peter}, title = {Combinatorial Logic Circuitry as Means to Protect Low Cost Devices Against Side Channel Attacks}, language = {en} } @inproceedings{RogassRudtschStrangfeldetal., author = {Rogaß, Harald and Rudtsch, Steffen and Strangfeld, Peter and Fischer, Ulrich}, title = {Thermal flux measurements on moist porous concrete}, series = {Thermal conductivity 23, proceedings of the Twenty-Third International Thermal Conductivity Conference, October 29 to November 1, 1995, Nashville, Tennessee}, booktitle = {Thermal conductivity 23, proceedings of the Twenty-Third International Thermal Conductivity Conference, October 29 to November 1, 1995, Nashville, Tennessee}, publisher = {Lancaster, Pa. [u.a.]}, address = {Technomic Publ.}, isbn = {1-566-76477-7}, language = {en} } @misc{KrimmlingPeterMahlig, author = {Krimmling, Jana and Peter, Steffen and Mahlig, Matthias}, title = {Test einer Bluetooth-Funkstrecke f{\"u}r die Prozessautomatisierung}, language = {de} } @misc{OrtmannMaaserLangendoerfer, author = {Ortmann, Steffen and Maaser, Michael and Langend{\"o}rfer, Peter}, title = {Self-Adapting Event Configuration in Ubiquitous Wireless Sensor Networks}, language = {en} } @inproceedings{OrtmannLangendoerfer, author = {Ortmann, Steffen and Langend{\"o}rfer, Peter}, title = {Enhancing Reliability of Sensor Networks by Fine Tuning Their Event Observation Behavior}, language = {en} } @incollection{MaaserOrtmannLangendoerfer, author = {Maaser, Michael and Ortmann, Steffen and Langend{\"o}rfer, Peter}, title = {The Privacy Advocate: Assertion of Privacy by Personalised Contracts}, language = {en} } @inproceedings{MaaserOrtmannLangendoerfer, author = {Maaser, Michael and Ortmann, Steffen and Langend{\"o}rfer, Peter}, title = {The Privacy Advocate (PrivAd): A Framework for Negotiating Individualized Privacy Contracts}, language = {en} } @incollection{OrtmannMaaserLangendoerfer, author = {Ortmann, Steffen and Maaser, Michael and Langend{\"o}rfer, Peter}, title = {High Level Definition of Event-based Applications for Pervasive Systems}, language = {en} } @incollection{OrtmannLangendoerfer, author = {Ortmann, Steffen and Langend{\"o}rfer, Peter}, title = {Social Networking and Privacy, a Contradiction?}, language = {en} } @misc{KloseReinholdLogschetal., author = {Klose, Markus and Reinhold, Romy and Logsch, Florian and Wolke, Florian and Linnemann, Julia and Stoeck, Ulrich and Oswald, Steffen and Uhlemann, Martin and Ballach, Juan and Markowski, Jens and Ay, Peter and Giebeler, Lars}, title = {Softwood lignin as a sustainable feedstock for porous carbons as active material for supercapacitors using an ionic liquid electrolyte}, series = {ACS Sustainable Chemistry \& Engineering}, volume = {5}, journal = {ACS Sustainable Chemistry \& Engineering}, number = {5}, pages = {4095 -- 4102}, language = {en} } @misc{JungNghinaunyeWaldecketal., author = {Jung, C. G. H. and Nghinaunye, Theopolina and Waldeck, Peter and Braune, Steffen and Petrick, Ingolf and K{\"u}pper, Jan-Heiner and Jung, Friedrich}, title = {Decarbonization of Arthrospira platensis production by using atmospheric CO2 as an exclusive carbon source: proof of principle}, series = {International Journal of Environmental Science and Technology}, journal = {International Journal of Environmental Science and Technology}, issn = {1735-2630}, doi = {10.1007/s13762-023-05215-x}, abstract = {There is an urgent need to develop technologies for removing CO2 from the atmosphere to combat climate change. Microalgae and cyanobacteria, such as Arthrospira platensis (AP), have shown promise due to their high photoautotrophic biomass production. Conventional AP culture media are supplemented with high concentrations of NaHCO3 since AP utilizes as a carbon source. These culture conditions result in significant amounts of CO2 escaping into the atmosphere, instead of being sequestered during cultivation. Here, we investigated whether ambient air (0.042\% CO2) can be used for growing AP in a culture medium lacking a fossil-based carbon source. AP was cultured in 2 L glass bioreactors containing: (1) Zarrouk medium with 16.8 g/L NaHCO3 and aeration with 0.236 vvm air with 2\% CO2 ("NaHCO3/CO2-based") to compensate carbon loss due to CO2 outgassing, and (2) Zarrouk medium without NaHCO3 and a gas flow with ambient air (0.926 vvm) as the only carbon source ("air-based"). The air-based production resulted in the biofixation of 3.78 gCO2/L during the linear growth phase. With NaHCO3/CO2-based production, a comparable amount of 3.42 gCO2/L was obtained while 659.12 g of CO2 was released into the atmosphere. Total protein, phycocyanin, chlorophyll-a, and carotenoids were present in similar or increased amounts in AP produced by the air-based method. We concluded that cultivation of AP with Zarrouk medium lacking NaHCO3 but using ambient air with atmospheric CO2 as the only carbon source is possible without reducing productivity. These results improve our understanding of how atmospheric CO2 can be reduced by culturing AP.}, language = {en} } @misc{JungWaldeckPetricketal., author = {Jung, Conrad H. G. and Waldeck, Peter and Petrick, Ingolf and Akinwunmi, Mosunmol and Braune, Steffen and Jung, Friedrich and K{\"u}pper, Jan-Heiner}, title = {Light-induced changes in the morphology and fluorescence of Arthrospira platensis}, series = {Clinical Hemorheology and Microcirculation}, volume = {9}, journal = {Clinical Hemorheology and Microcirculation}, number = {1}, issn = {1386-0291}, doi = {10.3233/JCB-239001}, pages = {71 -- 77}, abstract = {The cyanobacterium Arthrospira platensis is a well-known source of bioactive substances. Growth and the generation of bioactive ingredients of Arthrospira platensis depend mainly on the quantity of light in a controlled environment. Photoinhibition is a time, nutrient, and light intensity-dependent decrease in photosynthetic efficiency. However, too strong illumination can induce two harmful effects: (1) photoinhibition as a reduction in photosynthetic rate and (2) photooxidation which can have lethal effects on the cells, and which can lead to total loss of the culture. The results of this microscopical study demonstrate, that under the procedures described and very high photon flux den-sities, not only a decrease in the photosynthetic efficiency but beyond, also destruction of Arthrospira platensis can occur.}, language = {en} } @misc{JungWaldeckPetricketal., author = {Jung, Conrad H. G. and Waldeck, Peter and Petrick, Ingolf and Braune, Steffen and K{\"u}pper, Jan-Heiner and Jung, Friedrich}, title = {Bioreactor for the cultivation of Arthrospira platensis under controlled conditions}, series = {Journal of Cellular Biotechnology}, volume = {7}, journal = {Journal of Cellular Biotechnology}, number = {1}, doi = {10.3233/JCB-210032}, pages = {35 -- 40}, abstract = {A vertical flat-type bioreactor consisting of transparent polyethylene (food safe) was constructed, which is characterized by a flexible design and allows the adjustment of a light path of 1 cm - 8.5 cm and a working volume of 1.5 l - 4 l. To characterize the performance of the bioreactor, cultivation experiments were performed with the cyanobacterium Arthrospira platensis (AP). The growth was assessed continuously by monitoring optical density and intermittently by measuring the dry weight of the AP biomass. An on-line measurement technique for estimating biomass production rate in a photosynthetic microalgae culture was developed. The oxygen produced by AP in the culture medium was flushed out sparging using a mixture of air and CO2 (1\%). Factors which might influence the AP growth were monitored: pH, temperature, oxygen concentration and the filling level were corrected automatically to compensate evaporation losses. As an example, the huge influence of the light intensity on the AP growth was tested. The increase of the photon flux density of 15 to 1200μmol/(l · d) led to a 22-fold increase of the productivity and a 3.1-fold shorter doubling time. Using an online measurement technique - together with the control of the growth process via a wireless local area network (WLAN) router and virtual private network - allows monitoring the growth of Arthrospira platensis remotely.}, language = {en} } @misc{NghinaunyeWaldeckJungetal., author = {Nghinaunye, Theopolina and Waldeck, Peter and Jung, C. G. H. and K{\"u}pper, Jan-Heiner and Jung, Friedrich and Braune, Steffen}, title = {Response of Arthrospira platensis to different temperatures regarding growth and biochemical composition}, series = {Clinical Hemorheology and Microcirculation}, journal = {Clinical Hemorheology and Microcirculation}, issn = {1386-0291}, doi = {10.3233/CH-238104}, pages = {1 -- 7}, abstract = {The growth of cyanobacteria can vary considerably depending on the ambient temperature. Since the optimal growth temperature for Arthrospira platensis (strain SAG21.99) is not yet known, this was investigated in the present study. The study revealed that a process temperature of 30°C seems to be optimal for the Arthrospira strain SAG21.99 cultivation in terms of a maximum biomass productivity. This was also true for the phycocyanin content which was at 30°C significantly higher than at 20 or 40°C.}, language = {en} } @misc{AhmelsVossGagoetal., author = {Ahmels, Peter and Voß, Ulrike and Gago, Aldo and Lettenmeier, Philipp and Voglst{\"a}tter, Christopher and Schmitz, Steffen and Kleinickel, Cindy and Barsch, Markus and Rockmann, Rico and Pumpa, Martin and Fischer, Ulrich and Voigt, Andr{\´e}}, title = {Wasserstoff zur Windenergiespeicherung - Ergebnisse des Projektes WESpe}, series = {HZwei: das Magazin f{\"u}r Wasserstoff und Brennstoffzellen}, volume = {18}, journal = {HZwei: das Magazin f{\"u}r Wasserstoff und Brennstoffzellen}, number = {2}, issn = {1862-393X}, pages = {28 -- 30}, language = {de} } @misc{JungWaldeckSykoraetal., author = {Jung, Conrad H. G. and Waldeck, Peter and Sykora, Shadi and Braune, Steffen and Petrick, Ingolf and K{\"u}pper, Jan-Heiner and Jung, Friedrich}, title = {Influence of Different Light-Emitting Diode Colors on Growth and Phycobiliprotein Generation of Arthrospira platensis}, series = {Life}, volume = {12}, journal = {Life}, number = {6}, issn = {2075-1729}, doi = {10.3390/life12060895}, language = {en} } @misc{JungBrauneJungetal., author = {Jung, Friedrich and Braune, Steffen and Jung, Conrad H. G. and Kr{\"u}ger-Genge, Anne and Waldeck, Peter and Petrick, Ingolf and K{\"u}pper, Jan-Heiner}, title = {Lipophilic and Hydrophilic Compounds from Arthrospira platensis and Its Effects on Tissue and Blood Cells—An Overview}, series = {Life}, volume = {12}, journal = {Life}, number = {10}, issn = {2075-1729}, doi = {10.3390/life12101497}, language = {en} } @misc{JungBrauneWaldecketal., author = {Jung, Conrad H. G. and Braune, Steffen and Waldeck, Peter and K{\"u}pper, Jan-Heiner and Petrick, Ingolf and Jung, Friedrich}, title = {Morphology and Growth of Arthrospira platensis during Cultivation in a Flat-Type Bioreactor}, series = {Life}, volume = {11}, journal = {Life}, number = {6}, issn = {2075-1729}, doi = {10.3390/life11060536}, abstract = {Arthrospira platensis (AP) is a cyanobacterium with a high economic value and is nowadays one of the most important industrially cultivated microalgae. Knowledge of its growth is essential for the understanding of its physiology and yield. The growth of AP biomass occurs through two mechanisms: (1) propagation by fragmentation of trichomes, and (2) the trichomes are extended by binary fission until they reach their mature status. These phases are visualized by live cell light and laser scanning microscopy, demonstrating the different phases of AP growth.}, language = {en} } @misc{HaddadiEsfahaniDykaOrtmannetal., author = {Haddadi Esfahani, Ali and Dyka, Zoya and Ortmann, Steffen and Langend{\"o}rfer, Peter}, title = {Impact of Data Preparation in Freezing of Gait Detection using Feature-Less Recurrent Neural Network}, series = {IEEE Access}, journal = {IEEE Access}, number = {9}, issn = {2169-3536}, doi = {10.1109/ACCESS.2021.3117543}, pages = {138120 -- 138131}, language = {en} } @inproceedings{PeterZessackVateretal., author = {Peter, Steffen and Zessack, Mario and Vater, Frank and Panic, Goran and Frankenfeldt, Horst and Methfessel, Michael}, title = {An Encryption-Enabled Network Protocol Accelerator}, language = {en} } @inproceedings{OrtmannLangendoerfer, author = {Ortmann, Steffen and Langend{\"o}rfer, Peter}, title = {The Impact of Social Networks on User Privacy - What Social Networks Really Learn about their Users}, language = {en} } @inproceedings{OrtmannLangendoerfer, author = {Ortmann, Steffen and Langend{\"o}rfer, Peter}, title = {A Telemedicine System for Improved Rehabilitation of Stroke Patients}, language = {en} } @misc{OrtmannMaaserLangendoerfer, author = {Ortmann, Steffen and Maaser, Michael and Langend{\"o}rfer, Peter}, title = {Adaptive Pruning of Event Decision Trees for Energy Efficient Collaboration in Event Driven WSN}, language = {en} } @misc{OrtmannLangendoerferMaaser, author = {Ortmann, Steffen and Langend{\"o}rfer, Peter and Maaser, Michael}, title = {Enhancing Privacy by Applying Information Flow Modelling in Pervasive Systems}, language = {en} } @misc{OrtmannLangendoerferMaaser, author = {Ortmann, Steffen and Langend{\"o}rfer, Peter and Maaser, Michael}, title = {A Self-Configuring Privacy Management Architecture for Pervasive Systems}, language = {en} } @misc{MaaserOrtmannLangendoerfer, author = {Maaser, Michael and Ortmann, Steffen and Langend{\"o}rfer, Peter}, title = {NEPP: Negotiation Enhancements for Privacy Policies}, language = {en} } @misc{RuelkeSchneiderBachmannetal., author = {R{\"u}lke, Steffen and Schneider, J{\"o}rg and Bachmann, Peter and Rogin, Frank}, title = {Quality guaranty of reusable circuit description throught HDL-Source Code Analysis}, series = {International Workshop on IP-Based Synthesis and System Design'99}, journal = {International Workshop on IP-Based Synthesis and System Design'99}, language = {en} } @misc{OrtmannLangendoerferKornemann, author = {Ortmann, Steffen and Langend{\"o}rfer, Peter and Kornemann, Stephan}, title = {WiSec 2011 Demo: Demonstrating Self-Contained on-node Counter Measures for Various Jamming Attacks in WSN}, language = {en} } @misc{BasmerSchomannPeter, author = {Basmer, Thomas and Schomann, Henry and Peter, Steffen}, title = {Implementation Analysis of the IEEE 802.15.4 MAC for Wireless Sensor Networks}, language = {en} } @misc{Peter, author = {Peter, Steffen}, title = {Monitoring and Control of a Drinking Water Pipeline - An Application of Secure Wireless Sensor and Actuator Network}, language = {en} } @article{OrtmannLangendoerferMaaser, author = {Ortmann, Steffen and Langend{\"o}rfer, Peter and Maaser, Michael}, title = {Adaptive Pervasive Systems to Multiuser Privacy Requirements}, language = {en} } @techreport{GriloConcalvesPiotrowskietal., author = {Grilo, Antonio and Concalves, J. and Piotrowski, Krzysztof and Peter, Steffen and Holczer, T. and Buttyan, L. and Selhorst, M. and Fortunato, C. and Weber, G.}, title = {System Prototypes}, language = {en} } @techreport{PeterLacosteHinkelmannetal., author = {Peter, Steffen and Lacoste, M. and Hinkelmann, M. and Buschmann, C.}, title = {Definition of Performance and Security Parameters}, language = {en} } @techreport{Peter, author = {Peter, Steffen}, title = {Implementation of the Secure Middleware Architecture with an Energy Management System}, language = {en} } @techreport{Peter, author = {Peter, Steffen}, title = {Interfaces for Management as well as Service and Application Support}, language = {en} } @techreport{Peter, author = {Peter, Steffen}, title = {Tools and Methods for a Unified Secure design Flow of Sensor Node Hardware}, language = {en} } @techreport{Peter, author = {Peter, Steffen}, title = {Specification of Secure Code update Protocol for WSAN}, language = {en} } @techreport{Peter, author = {Peter, Steffen}, title = {Periodic Activities and Management Report}, language = {en} } @techreport{Peter, author = {Peter, Steffen}, title = {Sensor Network Related Requirements}, language = {en} } @techreport{SchmidtKirschbaumFrancillonetal., author = {Schmidt, J{\"o}rn-Marc and Kirschbaum, Mario and Francillon, Au{\´e}lien and Sekar, Manu and Vater, Frank and Peter, Steffen}, title = {Analysis of Attacks on Sensor Nodes Software and Hardware}, language = {en} } @misc{NeyretLeProvostBoesingetal., author = {Neyret, Margot and Le Provost, Ga{\"e}tane and Boesing, Andrea Larissa and Schneider, Florian D. and Baulechner, Dennis and Bergmann, Joana and Vries, Franciska T. de and Fiore-Donno, Anna Maria and Geisen, Stefan and Goldmann, Kezia and Merges, Anna and Saifutdinov, Ruslan A. and Simons, Nadja K. and Tobias, Joseph A. and Zaitsev, Andrey S. and Gossner, Martin M. and Jung, Kirsten and Kandeler, Ellen and Krauss, Jochen and Penone, Caterina and Schloter, Michael and Schulz, Stefanie and Staab, Michael and Wolters, Volkmar and Apostolakis, Antonios and Birkhofer, Klaus and Boch, Steffen and Boeddinghaus, Runa S. and Bolliger, Ralph and Bonkowski, Michael and Buscot, Fran{\c{c}}ois and Dumack, Kenneth and Fischer, Markus and Gan, Huei Ying and Heinze, Johannes and H{\"o}lzel, Norbert and John, Katharina and Klaus, Valentin H. and Kleinebecker, Till and Marhan, Sven and M{\"u}ller, J{\"o}rg and Renner, Swen C. and Rillig, Matthias C. and Schenk, No{\"e}lle V. and Sch{\"o}ning, Ingo and Schrumpf, Marion and Seibold, Sebastian and Socher, Stephanie A. and Solly, Emily F. and Teuscher, Miriam and Kleunen, Mark van and Wubet, Tesfaye and Manning, Peter}, title = {A slow-fast trait continuum at the whole community level in relation to land-use intensification}, series = {Nature Communications}, volume = {15}, journal = {Nature Communications}, number = {1}, issn = {2041-1723}, doi = {10.1038/s41467-024-45113-5}, abstract = {AbstractOrganismal functional strategies form a continuum from slow- to fast-growing organisms, in response to common drivers such as resource availability and disturbance. However, whether there is synchronisation of these strategies at the entire community level is unclear. Here, we combine trait data for 2800 above- and belowground taxa from 14 trophic guilds spanning a disturbance and resource availability gradient in German grasslands. The results indicate that most guilds consistently respond to these drivers through both direct and trophically mediated effects, resulting in a 'slow-fast' axis at the level of the entire community. Using 15 indicators of carbon and nutrient fluxes, biomass production and decomposition, we also show that fast trait communities are associated with faster rates of ecosystem functioning. These findings demonstrate that 'slow' and 'fast' strategies can be manifested at the level of whole communities, opening new avenues of ecosystem-level functional classification.}, language = {en} }