0000000000414128

AUTHOR

Leif Dehmelt

showing 4 related works from this author

Configurable low-cost plotter device for fabrication of multi-color sub-cellular scale microarrays.

2014

We report on the construction and operation of a low-cost plotter for fabrication of microarrays for multiplexed single-cell analyses. The printing head consists of polymeric pyramidal pens mounted on a rotation stage installed on an aluminium frame. This construction enables printing of microarrays onto glass substrates mounted on a tilt stage, controlled by a Lab-View operated user interface. The plotter can be assembled by typical academic workshops from components of less than 15 000 Euro. The functionality of the instrument is demonstrated by printing DNA microarrays on the area of 0.5 squared centimeters using up to three different oligonucleotides. Typical feature sizes are 5 μm diam…

FabricationMaterials scienceScale (ratio)NanotechnologyMultiplexingBiomaterialsUser-Computer InterfacePlotterHumansGeneral Materials ScienceBiochipOligonucleotide Array Sequence AnalysisEGF ReceptorsEpidermal Growth FactorOligonucleotideDNA-directed protein immobilization EGF receptors device automation multiplexed patterns polymer pen lithographyGeneral ChemistryMicrofluidic Analytical TechniquesErbB ReceptorsTissue Array AnalysisCosts and Cost AnalysisMCF-7 CellsPrintingDNA microarraySingle-Cell AnalysisBiotechnologySmall (Weinheim an der Bergstrasse, Germany)
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A Protein-Interaction Array Inside a Living Cell

2013

Cell phenotype is determined by protein network states that are maintained by the dynamics of multiple protein interactions.1 Fluorescence microscopy approaches that measure protein interactions in individual cells, such as by Forster resonant energy transfer (FRET), are limited by the spectral separation of fluorophores and thus are most suitable to analyze a single protein interaction in a given cell. However, analysis of correlations between multiple protein interactions is required to uncover the interdependence of protein reactions in dynamic signal networks. Available protein-array technologies enable the parallel analysis of interacting proteins from cell extracts, however, they can …

ImmunoprecipitationRecombinant Fusion Proteinsprotein-protein interactionsImmobilized Nucleic AcidsProtein Array AnalysisreceptorsDNA Single-StrandedCatalysisProtein–protein interactionReceptors G-Protein-CoupledBimolecular fluorescence complementationProtein Array AnalysisChlorocebus aethiopsFluorescence microscopeFluorescence Resonance Energy TransferAnimalsProtein Interaction MapsProtein kinase Amultiplexed assayChemistryProteinsProtein-protein interactions Dip Pen Nanolithography Protein KinaseDNA directed immobilizationGeneral MedicineGeneral ChemistryCommunicationssurface-immobilizationKineticsLuminescent ProteinsFörster resonance energy transferBiochemistryMicroscopy FluorescenceCOS CellsBiophysicsSignal transductionAntibodies Immobilizedsignal transduction
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Biochips for cell biology by combined dip-pen nanolithography and DNA-directed protein immobilization.

2013

A general methodology for patterning of multiple protein ligands with lateral dimensions below those of single cells is described. It employs dip pen nanolithography (DPN) patterning of DNA oligonucleotides which are then used as capture strands for DNA-directed immobilization (DDI) of oligonucleotide-tagged proteins. This study reports the development and optimization of PEG-based liquid ink, used as carrier for the immobilization of alkylamino-labeled DNA oligomers on chemically activated glass surfaces. The resulting DNA arrays have typical spot sizes of 4-5 μm with a pitch of 12 μm micrometer. It is demonstrated that the arrays can be further functionalized with covalent DNA-streptavidi…

Materials scienceSurface PropertiesGreen Fluorescent ProteinsOligonucleotidesLigandsBiomaterialsCell membranechemistry.chemical_compoundEpidermal growth factorDip-pen nanolithographyCell Line TumorMaterials TestingMicrochip Analytical ProceduresmedicineHumansNanotechnologyGeneral Materials ScienceBiotinylationBiochipOligonucleotide Array Sequence AnalysisEpidermal Growth FactorOligonucleotideCell MembraneProteinsNanolitographyGeneral ChemistryCell BiologyDNABiochipCell biologymedicine.anatomical_structurecell.chemistryBiotinylationMCF-7 CellsGlassproteinDNABiotechnologyProtein ligandSmall (Weinheim an der Bergstrasse, Germany)
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Preparation of Biomolecule Microstructures and Microarrays by Thiol-ene Photoimmobilization

2009

A mild, fast and flexible method for photoimmobilization of biomolecules based on the light-initiated thiol-ene reaction has been developed. After investigation and optimization of various surface materials, surface chemistries and reaction parameters, microstructures and microarrays of biotin, oligonucleotides, peptides, and MUC1 tandem repeat glycopeptides were prepared with this photoimmobilization method. Furthermore, MUC1 tandem repeat glycopeptide microarrays were successfully used to probe antibodies in mouse serum obtained from vaccinated mice. Dimensions of biomolecule microstructures were shown to be freely controllable through photolithographic techniques, and features down to 5 …

LightUltraviolet RaysMicroarraysOligonucleotidesBiotinNanotechnologyCorrelated Electron Systems / High Field Magnet Laboratory (HFML)BiochemistryAntibodiesMicechemistry.chemical_compoundBiotinTandem repeatIR-72760AnimalsSulfhydryl CompoundsBiochipMolecular BiologyEne reactionchemistry.chemical_classificationthiol–ene reactionphotochemistryThiol-ene reactionOligonucleotideBiomoleculeMucin-1Organic ChemistryGlycopeptidesMicroarray AnalysisPhotochemical ProcessesImmobilized ProteinsBiochipschemistryimmobilizationMolecular MedicineDNA microarrayMETIS-273430ChemBioChem
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