TY - BOOK A1 - Wollenberger, Ursula A1 - Renneberg, Reinhard A1 - Bier, Frank Fabian A1 - Scheller, Frieder W. T1 - Analytische Biochemie : eine praktische Einführung in das Messen mit Biomolekülen Y1 - 2003 SN - 3-527-30166-6 PB - John Wiley & Sons CY - Hoboken ER - TY - GEN A1 - Wessig, Pablo A1 - Bader, Denise A1 - Klier, Dennis Tobias A1 - Hettrich, Cornelia A1 - Bier, Frank Fabian T1 - Detecting carbohydrate–lectin interactions using a fluorescent probe based on DBD dyes N2 - Herein we present an efficient synthesis of a biomimetic probe with modular construction that can be specifically bound by the mannose binding FimH protein – a surface adhesion protein of E. coli bacteria. The synthesis combines the new and interesting DBD dye with the carbohydrate ligand mannose via a Click reaction. We demonstrate the binding to E. coli bacteria over a large concentration range and also present some special characteristics of those molecules that are of particular interest for the application as a biosensor. In particular, the mix-and-measure ability and the very good photo-stability should be highlighted here. T3 - Zweitveröffentlichungen der Universität Potsdam : Mathematisch-Naturwissenschaftliche Reihe - 314 KW - conformational-changes KW - green-i KW - protein KW - binding KW - assay Y1 - 2016 U6 - http://nbn-resolving.de/urn/resolver.pl?urn:nbn:de:kobv:517-opus4-394382 SP - 1235 EP - 1238 ER - TY - JOUR A1 - Warmt, Christian A1 - Fenzel, Carolin Kornelia A1 - Henkel, Jörg A1 - Bier, Frank Fabian T1 - Using Cy5-dUTP labelling of RPA-amplicons with downstream microarray analysis for the detection of antibiotic resistance genes JF - Scientific reports N2 - In this report we describe Cy5-dUTP labelling of recombinase-polymerase-amplification (RPA) products directly during the amplification process for the first time. Nucleic acid amplification techniques, especially polymerase-chain-reaction as well as various isothermal amplification methods such as RPA, becomes a promising tool in the detection of pathogens and target specific genes. Actually, RPA even provides more advantages. This isothermal method got popular in point of care diagnostics because of its speed and sensitivity but requires pre-labelled primer or probes for a following detection of the amplicons. To overcome this disadvantages, we performed an labelling of RPA-amplicons with Cy5-dUTP without the need of pre-labelled primers. The amplification results of various multiple antibiotic resistance genes indicating great potential as a flexible and promising tool with high specific and sensitive detection capabilities of the target genes. After the determination of an appropriate rate of 1% Cy5-dUTP and 99% unlabelled dTTP we were able to detect the bla(CTX-M15) gene in less than 1.6E-03 ng genomic DNA corresponding to approximately 200 cfu of Escherichia coli cells in only 40 min amplification time. Y1 - 2021 U6 - https://doi.org/10.1038/s41598-021-99774-z SN - 2045-2322 VL - 11 IS - 1 PB - Macmillan Publishers Limited, part of Springer Nature CY - [London] ER - TY - JOUR A1 - Tanne, Johannes A1 - Jeoung, Jae-Hun A1 - Peng, Lei A1 - Yarman, Aysu A1 - Dietzel, Birgit A1 - Schulz, Burkhard A1 - Schad, Daniel A1 - Dobbek, Holger A1 - Wollenberger, Ursula A1 - Bier, Frank Fabian A1 - Scheller, Frieder W. T1 - Direct Electron Transfer and Bioelectrocatalysis by a Hexameric, Heme Protein at Nanostructured Electrodes JF - Electroanalysis : an international journal devoted to fundamental and practical aspects of electroanalysis N2 - A nanohybrid consisting of poly(3-aminobenzenesulfonic acid-co-aniline) and multiwalled carbon nanotubes [MWCNT-P(ABS-A)]) on a gold electrode was used to immobilize the hexameric tyrosine-coordinated heme protein (HTHP). The enzyme showed direct electron transfer between the heme group of the protein and the nanostructured surface. Desorption of the noncovalently bound heme from the protein could be excluded by control measurements with adsorbed hemin on aminohexanthiol-modified electrodes. The nanostructuring and the optimised charge characteristics resulted in a higher protein coverage as compared with MUA/MU modified electrodes. The adsorbed enzyme shows catalytic activity for the cathodic H2O2 reduction and oxidation of NADH. KW - HTHP KW - Nanohybrid KW - Poylaniline KW - Multiwalled carbon nanotube Y1 - 2015 U6 - https://doi.org/10.1002/elan.201500231 SN - 1040-0397 SN - 1521-4109 VL - 27 IS - 10 SP - 2262 EP - 2267 PB - Wiley-VCH CY - Weinheim ER - TY - JOUR A1 - Stöcklein, Walter F. M. A1 - Makower, Alexander A1 - Bier, Frank Fabian A1 - Scheller, Frieder W. T1 - Enzyme sensors and enzyme amplifification systems Y1 - 1997 ER - TY - JOUR A1 - Steffen, Jenny A1 - von Nickisch-Rosenegk, Markus A1 - Bier, Frank Fabian T1 - In vitro transcription of a whole gene on a surface-coupled template N2 - An artificial gene was constructed combining the T7 promoter and terminator with the EGFP-gene from the plasmid pEGFP. The functionality of the construct was shown by in vitro translation. The gene-construct was immobilised on a planar glass surface. The transcription was performed on the immobilised gene and mRNA was determined by RT-PCR. Multiple use of the immobilised gene was demonstrated Y1 - 2005 SN - 1473-0189 ER - TY - JOUR A1 - Stech, Marlitt A1 - Merk, Helmut A1 - Schenk, Jörg A. A1 - Stöcklein, Walter F. M. A1 - Wüstenhagen, Doreen Anja A1 - Micheel, Burkhard A1 - Duschl, Claus A1 - Bier, Frank Fabian A1 - Kubick, Stefan T1 - Production of functional antibody fragments in a vesicle-based eukaryotic cell-free translation system JF - Journal of biotechnology N2 - Cell-free protein synthesis is of increasing interest for the rapid and high-throughput synthesis of many proteins, in particular also antibody fragments. In this study, we present a novel strategy for the production of single chain antibody fragments (scFv) in a eukaryotic in vitro translation system. This strategy comprises the cell-free expression, isolation and label-free interaction analysis of a model antibody fragment synthesized in two differently prepared insect cell lysates. These lysates contain translocationally active microsomal structures derived from the endoplasmic reticulum (ER), allowing for posttranslational modifications of cell-free synthesized proteins. Both types of these insect cell lysates enable the synthesis and translocation of scFv into ER-derived vesicles. However, only the one that has a specifically adapted redox potential yields functional active antibody fragments. We have developed a new methodology for the isolation of functional target proteins based on the translocation of cell-free produced scFv into microsomal structures and subsequent collection of protein-enriched vesicles. Antibody fragments that have been released from these vesicles are shown to be well suited for label-free binding studies. Altogether, these results show the potential of insect cell lysates for the production, purification and selection of antibody fragments in an easy-to-handle and time-saving manner. KW - Cell-free KW - In vitro translation KW - Single chain antibody (scFv) KW - Insect lysate KW - Surface plasmon resonance Y1 - 2012 U6 - https://doi.org/10.1016/j.jbiotec.2012.08.020 SN - 0168-1656 VL - 164 IS - 2 SP - 220 EP - 231 PB - Elsevier CY - Amsterdam ER - TY - JOUR A1 - Stanke, Sandra A1 - Wenger, Christian A1 - Bier, Frank Fabian A1 - Hölzel, Ralph T1 - AC electrokinetic immobilization of influenza virus JF - Electrophoresis : microfluids & proteomics N2 - The use of alternating current (AC) electrokinetic forces, like dielectrophoresis and AC electroosmosis, as a simple and fast method to immobilize sub-micrometer objects onto nanoelectrode arrays is presented. Due to its medical relevance, the influenza virus is chosen as a model organism. One of the outstanding features is that the immobilization of viral material to the electrodes can be achieved permanently, allowing subsequent handling independently from the electrical setup. Thus, by using merely electric fields, we demonstrate that the need of prior chemical surface modification could become obsolete. The accumulation of viral material over time is observed by fluorescence microscopy. The influences of side effects like electrothermal fluid flow, causing a fluid motion above the electrodes and causing an intensity gradient within the electrode array, are discussed. Due to the improved resolution by combining fluorescence microscopy with deconvolution, it is shown that the viral material is mainly drawn to the electrode edge and to a lesser extent to the electrode surface. Finally, areas of application for this functionalization technique are presented. KW - AC electrokinetics KW - AC electroosmosis KW - dielectrophoresis KW - influenza virus KW - nanoelectrodes Y1 - 2022 U6 - https://doi.org/10.1002/elps.202100324 SN - 0173-0835 SN - 1522-2683 VL - 43 IS - 12 SP - 1309 EP - 1321 PB - Wiley-Blackwell CY - Weinheim ER - TY - JOUR A1 - Stanke, Sandra A1 - Bier, Frank Fabian A1 - Hoezel, Ralph T1 - Fluid streaming above interdigitated electrodes in dielectrophoresis experiments JF - Electrophoresis : microfluidics, nanoanalysis & proteomics N2 - For the investigation of alternating current electrokinetic effects, a system is presented that allows for the simultaneous observation of fluid flow above and around microelectrodes in all three directions in space. Beside the usual microscopical view from top, lateral observation through the same objective is made possible by two small mirrors that are placed next to the electrodes. Fluid flow and movement of fluorescent nanoparticles above interdigitated electrodes are monitored by fluorescence microscopy and digital imaging and are further analysed by image processing. Field frequencies are varied from 10 Hz to 1 GHz at up to 10V(rms). Electrical conductivity of the fluid is monitored in situ in the actual measuring chamber. KW - Dielectrophoresis KW - Fluid streaming KW - Nanobead Y1 - 2011 U6 - https://doi.org/10.1002/elps.201100096 SN - 0173-0835 VL - 32 IS - 18 SP - 2448 EP - 2455 PB - Wiley-Blackwell CY - Malden ER - TY - GEN A1 - Stanke, S. A1 - Wenger, C. A1 - Bier, Frank Fabian A1 - Hölzel, Ralph T1 - Dielectrophoretic functionalization of nanoelectrode arrays for the detection of influenza viruses T2 - European biophysics journal : with biophysics letters ; an international journal of biophysics Y1 - 2017 SN - 0175-7571 SN - 1432-1017 VL - 46 SP - S337 EP - S337 PB - Springer CY - New York ER - TY - JOUR A1 - Song, Min Ik A1 - Bier, Frank Fabian A1 - Scheller, Frieder W. T1 - A method to detect superoxide radicals using teflon membrane and superoxide dismutase Y1 - 1995 ER - TY - JOUR A1 - Schmitz-Hertzberg, Sebastian-Tim A1 - Mak, Wing Cheung A1 - Lai, Kwok Kei A1 - Teller, Carsten A1 - Bier, Frank Fabian T1 - Multifactorial design of Poly(D, L-lactic-co-glycolic acid) capsules with various release properties for differently sized filling agents JF - Journal of applied polymer science N2 - The hydrolytic degradation and corresponding content release of capsules made of poly(d,l-lactic-co-glycolic acid) (PLGA) strongly depends on the composition and material properties of the initially applied copolymer. Consecutive or simultaneous release from capsule batches of combinable material compositions, therefore, offers high control over the bioavailability of an encapsulated drug. The keynote of this study was the creation of a superordinated database that addressed the correlation between the release kinetics of filling agents with different molecular weights from PLGA capsules of alternating composition. Fluorescein isothiocyanate (FITC)-dextran (with molecular weights of 4, 40, and 2000 kDa) was chosen as a model analyte, whereas the copolymers were taken from various 50:50 PLGA, 75:25 PLGA, and polylactide blends. With reference to recent publications, the capsule properties, such as the size, morphology, and encapsulation efficiency, were further modified during production. Hence, uniform microdisperse and polydisperse submicrometer nanocapsules were prepared by two different water-in-oil-in-water emulsification techniques, and additional effects on the size and morphology were achieved by capsule solidification in two different sodium salt buffers. The qualitative and quantitative examination of the physical capsule properties was performed by confocal laser scanning microscopy, scanning electron microscopy, and Coulter counting techniques to evaluate the capsule size distribution and the morphological appearance of the different batches. The corresponding agent release was quantified by fluorescence measurement of the FITC-dextran in the incubation media and by the direct measurement of the capsule brightness via fluorescence microscopy. In summary, the observed agent release showed a highly controllable flexibility depending on the PLGA blends, preparation methods, and molecular weight of the used filling substances. (c) 2013 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 130: 4219-4228, 2013 KW - biodegradable copolymers (PLGA) KW - microcapsules KW - submicrometer KW - nanocapsules KW - FITC-dextran release KW - drug delivery system KW - biomedical applications Y1 - 2013 U6 - https://doi.org/10.1002/app.39537 SN - 0021-8995 SN - 1097-4628 VL - 130 IS - 6 SP - 4219 EP - 4228 PB - Wiley-Blackwell CY - Hoboken ER - TY - JOUR A1 - Schmitz-Hertzberg, Sebastian-Tim A1 - Liese, Rick A1 - Terjung, Carsten A1 - Bier, Frank Fabian T1 - Towards a smart encapsulation system for small-sized electronic devices: a new approach JF - International journal of polymer science N2 - Miniaturized analytical chip devices like biosensors nowadays provide assistance in highly diverse fields of application such as point-of-care diagnostics and industrial bioprocess engineering. However, upon contact with fluids, the sensor requires a protective shell for its electrical components that simultaneously offers controlled access for the target analytes to the measuring units. We therefore developed a capsule that comprises a permeable and a sealed compartment consisting of variable polymers such as biocompatible and biodegradable polylactic acid (PLA) for medical applications or more economical polyvinyl chloride (PVC) and polystyrene (PS) polymers for bioengineering applications. Production of the sealed capsule compartments was performed by heat pressing of polymer pellets placed in individually designable molds. Controlled permeability of the opposite compartments was achieved by inclusion of NaCl inside the polymer matrix during heat pressing, followed by its subsequent release in aqueous solution. Correlating diffusion rates through the so made permeable capsule compartments were quantified for preselected model analytes: glucose, peroxidase, and polystyrene beads of three different diameters (1.4 mu m, 4.2 mu m, and 20.0 mu m). In summary, the presented capsule system turned out to provide sufficient shelter for small-sized electronic devices and gives insight into its potential permeability for defined substances of analytical interest. Y1 - 2014 U6 - https://doi.org/10.1155/2014/713603 SN - 1687-9422 SN - 1687-9430 PB - Hindawi Publishing Corp. CY - New York ER - TY - JOUR A1 - Schmidt, Peter Michael A1 - Matthes, E. A1 - Scheller, Frieder W. A1 - Bier, Frank Fabian T1 - Nachweis der Telomeraseaktivität in Zellkulturen mittels eines faseroptischen Sensors Y1 - 2001 ER - TY - JOUR A1 - Scheller, Frieder W. A1 - Yarman, Aysu A1 - Bachmann, Till A1 - Hirsch, Thomas A1 - Kubick, Stefan A1 - Renneberg, Reinhard A1 - Schumacher, Soeren A1 - Wollenberger, Ursula A1 - Teller, Carsten A1 - Bier, Frank Fabian ED - Gu, MB ED - Kim, HS T1 - Future of biosensors: a personal view JF - Advances in biochemical engineering, biotechnology JF - Advances in Biochemical Engineering-Biotechnology N2 - Biosensors representing the technological counterpart of living senses have found routine application in amperometric enzyme electrodes for decentralized blood glucose measurement, interaction analysis by surface plasmon resonance in drug development, and to some extent DNA chips for expression analysis and enzyme polymorphisms. These technologies have already reached a highly advanced level and need minor improvement at most. The dream of the "100-dollar' personal genome may come true in the next few years provided that the technological hurdles of nanopore technology or of polymerase-based single molecule sequencing can be overcome. Tailor-made recognition elements for biosensors including membrane-bound enzymes and receptors will be prepared by cell-free protein synthesis. As alternatives for biological recognition elements, molecularly imprinted polymers (MIPs) have been created. They have the potential to substitute antibodies in biosensors and biochips for the measurement of low-molecular-weight substances, proteins, viruses, and living cells. They are more stable than proteins and can be produced in large amounts by chemical synthesis. Integration of nanomaterials, especially of graphene, could lead to new miniaturized biosensors with high sensitivity and ultrafast response. In the future individual therapy will include genetic profiling of isoenzymes and polymorphic forms of drug-metabolizing enzymes especially of the cytochrome P450 family. For defining the pharmacokinetics including the clearance of a given genotype enzyme electrodes will be a useful tool. For decentralized online patient control or the integration into everyday "consumables' such as drinking water, foods, hygienic articles, clothing, or for control of air conditioners in buildings and cars and swimming pools, a new generation of "autonomous' biosensors will emerge. KW - Biosensors KW - Molecularly imprinted polymers KW - Personalized medicine Y1 - 2014 SN - 978-3-642-54143-8; 978-3-642-54142-1 U6 - https://doi.org/10.1007/10_2013_251 SN - 0724-6145 VL - 140 SP - 1 EP - 28 PB - Springer CY - Berlin ER - TY - JOUR A1 - Scheller, Frieder W. A1 - Schubert, Florian A1 - Bier, Frank Fabian T1 - Vom Biosensor zur Nanobiotechnologie Y1 - 1995 ER - TY - JOUR A1 - Scheller, Frieder W. A1 - Makower, Alexander A1 - Ghindilis, A. L. A1 - Bier, Frank Fabian A1 - Ehrentreich-Förster, Eva A1 - Wollenberger, Ursula A1 - Bauer, Christian G. A1 - Micheel, Burkhard A1 - Pfeiffer, Dorothea A1 - Szeponik, Jan A1 - Michael, N. A1 - Kaden, H. T1 - Enzyme sensors for subnanomolar concentrations Y1 - 1995 ER - TY - JOUR A1 - Scheller, Frieder W. A1 - Makower, Alexander A1 - Bier, Frank Fabian A1 - Wollenberger, Ursula A1 - Ghindilis, A. L. A1 - Eremenko, A. V. A1 - Pfeiffer, Dorothea T1 - Enzymsensoren zur Bestimmung subnanomolarer Konzentrationen Y1 - 1995 ER - TY - JOUR A1 - Scheller, Frieder W. A1 - Kleinjung, Frank A1 - Bier, Frank Fabian A1 - Markower, Alexander A1 - Neumann, Barbara A1 - Wollenberger, Ursula A1 - Kurochkin, Iliya N. A1 - Eremenko, Arkadi V. A1 - Barmin, Anatoli V. A1 - Klußmann, Sven A1 - Fürste, Jens-Peter A1 - Erdmann, Volker A. A1 - Mansuy, D. T1 - New recognition elements in biosensing Y1 - 1998 ER - TY - JOUR A1 - Scheller, Frieder W. A1 - Bier, Frank Fabian A1 - Pfeiffer, Dorothea T1 - Biosensoren : Grundlagen und Anwendungen Y1 - 1995 ER -