@article{WernerTakenagaTakietal.2013, author = {Werner, Frederik and Takenaga, Shoko and Taki, Hidenori and Sawada, Kazuaki and Sch{\"o}ning, Michael Josef}, title = {Comparison of label-free ACh-imaging sensors based on CCD and LAPS}, series = {Sensors and Actuators B: Chemical (2012)}, volume = {177}, journal = {Sensors and Actuators B: Chemical (2012)}, publisher = {Elsevier}, address = {Amsterdam}, isbn = {0925-4005}, pages = {745 -- 752}, year = {2013}, abstract = {Semiconductor-based chemical imaging sensors, like the light-addressable potentiometric sensor (LAPS) or the pH-imaging sensor based on a charge-coupled device (CCD), are becoming a powerful tool for label-free imaging of biological phenomena. We have proposed a polyion-based enzymatic membrane to develop an acetylcholine (ACh) imaging sensor for neural cell-activity observations. In this study, a CCD-type ACh-imaging sensor and a LAPS-type ACh-imaging sensor were fabricated and the prospect of both sensors was clarified by making a comparison of their basic characteristics.}, language = {en} } @article{WernerWagnerMiyamotoetal.2012, author = {Werner, Frederik and Wagner, Torsten and Miyamoto, Ko-ichiro and Yoshinobu, Tatsuo and Sch{\"o}ning, Michael Josef}, title = {High speed and high resolution chemical imaging based on a new type of OLED-LAPS set-up}, series = {Sensors and Actuators B: Chemical}, volume = {175}, journal = {Sensors and Actuators B: Chemical}, publisher = {Elsevier}, address = {Amsterdam}, issn = {0925-4005}, doi = {10.1016/j.snb.2011.12.102}, pages = {118 -- 122}, year = {2012}, abstract = {Light-addressable potentiometric sensors (LAPS) are field-effect-based sensors. A modulated light source is used to define the particular measurement spot to perform spatially resolved measurements of chemical species and to generate chemical images. In this work, an organic-LED (OLED) display has been chosen as a light source. This allows high measurement resolution and miniaturisation of the system. A new developed driving method for the OLED display optimised for LAPS-based measurements is demonstrated. The new method enables to define modulation frequencies between 1 kHz and 16 kHz and hence, reduces the measurement time of a chemical image by a factor of 40 compared to the traditional addressing of an OLED display.}, language = {en} } @article{WernerWagnerMiyamotoetal.2011, author = {Werner, Frederik and Wagner, Torsten and Miyamoto, Ko-ichiro and Yoshinobu, Tatsuo and Sch{\"o}ning, Michael Josef}, title = {High speed and high resolution chemical imaging based on a new type of OLED-LAPS set-up}, series = {Procedia Engineering. 25 (2011)}, journal = {Procedia Engineering. 25 (2011)}, publisher = {Elsevier}, address = {Amsterdam}, isbn = {1877-7058}, pages = {346 -- 349}, year = {2011}, language = {en} } @article{WernerWagnerYoshinobuetal.2013, author = {Werner, Frederik and Wagner, Torsten and Yoshinobu, Tatsuo and Keusgen, Michael and Sch{\"o}ning, Michael Josef}, title = {Frequency behaviour of light-addressable potentiometric sensors}, series = {Physica Status Solidi (A)}, volume = {210}, journal = {Physica Status Solidi (A)}, number = {5}, publisher = {Wiley-VCH}, address = {Weinheim}, issn = {1521-396X ; 0031-8965}, doi = {10.1002/pssa.201200929}, pages = {884 -- 891}, year = {2013}, abstract = {Light-addressable potentiometric sensors (LAPS) are semiconductor-based potentiometric sensors, with the advantage to detect the concentration of a chemical species in a liquid solution above the sensor surface in a spatially resolved manner. The addressing is achieved by a modulated and focused light source illuminating the semiconductor and generating a concentration-depending photocurrent. This work introduces a LAPS set-up that is able to monitor the electrical impedance in addition to the photocurrent. The impedance spectra of a LAPS structure, with and without illumination, as well as the frequency behaviour of the LAPS measurement are investigated. The measurements are supported by electrical equivalent circuits to explain the impedance and the LAPS-frequency behaviour. The work investigates the influence of different parameters on the frequency behaviour of the LAPS. Furthermore, the phase shift of the photocurrent, the influence of the surface potential as well as the changes of the sensor impedance will be discussed.}, language = {en} } @article{WertIkenSchoeningetal.2021, author = {Wert, Stefan and Iken, Heiko and Sch{\"o}ning, Michael Josef and Matysik, Frank-Michael}, title = {Development of a temperature-pulse enhanced electrochemical glucose biosensor and characterization of its stability via scanning electrochemical microscopy}, series = {Electroanalysis}, journal = {Electroanalysis}, number = {Early View}, publisher = {Wiley-VCH}, address = {Weinheim}, issn = {1521-4109}, doi = {10.1002/elan.202100089}, year = {2021}, abstract = {Glucose oxidase (GOx) is an enzyme frequently used in glucose biosensors. As increased temperatures can enhance the performance of electrochemical sensors, we investigated the impact of temperature pulses on GOx that was drop-coated on flattened Pt microwires. The wires were heated by an alternating current. The sensitivity towards glucose and the temperature stability of GOx was investigated by amperometry. An up to 22-fold increase of sensitivity was observed. Spatially resolved enzyme activity changes were investigated via scanning electrochemical microscopy. The application of short (<100 ms) heat pulses was associated with less thermal inactivation of the immobilized GOx than long-term heating.}, language = {en} } @article{Wessling1998, author = {Weßling, Matthias}, title = {Der Einsatz fertiger Videofilme in der Personalentwicklung}, series = {Personal - Zeitschrift f{\"u}r Human Resource Management. 50 (1998), H. 3}, journal = {Personal - Zeitschrift f{\"u}r Human Resource Management. 50 (1998), H. 3}, isbn = {0031-5605}, pages = {128 -- 130}, year = {1998}, language = {de} } @article{Wessling1997, author = {Weßling, Matthias}, title = {Coaching - Literaturreport deutschsprachiger Monographien}, series = {Personal - Zeitschrift f{\"u}r Human Resource Management. 49 (1997), H. 7}, journal = {Personal - Zeitschrift f{\"u}r Human Resource Management. 49 (1997), H. 7}, isbn = {0031-5605}, pages = {377 -- 378}, year = {1997}, language = {de} } @article{Wessling1999, author = {Weßling, Matthias}, title = {Angewandte Psychologie f{\"u}r (Nachwuchs-) Manager: Die F{\"o}rderung von Eigenverantwortung und sozialer Handlungskompetenz durch Verhaltenstrainings}, series = {Psychologie an Fachhochschulen / G{\"u}nther, Ullrich [Hrsg.]}, journal = {Psychologie an Fachhochschulen / G{\"u}nther, Ullrich [Hrsg.]}, publisher = {Pabst}, address = {Lengerich [u.a.]}, isbn = {3-934252-29-X}, pages = {72 -- 92}, year = {1999}, language = {de} } @article{Wessling1998, author = {Weßling, Matthias}, title = {Existenzgr{\"u}ndung - Intensivtraining macht fit}, series = {DUZ : das unabh{\"a}ngige Hochschulmagazin. 54 (1998), H. 5}, journal = {DUZ : das unabh{\"a}ngige Hochschulmagazin. 54 (1998), H. 5}, isbn = {0936-4501}, pages = {14 -- 15}, year = {1998}, language = {de} } @article{Wessling1998, author = {Weßling, Matthias}, title = {Existenzgr{\"u}ndung - ein didaktisch innovatives Fachhochschulseminar}, series = {Die neue Hochschule : Nachrichten, Meinungen, Berichte / Hrsg.: Hochschullehrerbund - Bundesvereinigung - e.V. (hlb). 39 (1998), H. 2}, journal = {Die neue Hochschule : Nachrichten, Meinungen, Berichte / Hrsg.: Hochschullehrerbund - Bundesvereinigung - e.V. (hlb). 39 (1998), H. 2}, isbn = {0340-448x}, pages = {7 -- 9}, year = {1998}, language = {de} }