Search
Results
-
Atomic force microscope probe based controlled pushing for nanotribological characterization
(2004)IEEE/ASME Transactions on MechatronicsUsing an atomic force microscope (AFM) probe as a nanomanipulator, micrometer- and nanometer-sized objects, especially particles, are pushed on substrates for characterizing the object-substrate friction parameters and behavior in various environments, e.g., air, liquid, and vacuum. Two possible nanotribological characterization methods are proposed in this paper: 1) sliding the micro/nano-object on the substrate while it is attached to ...Journal Article -
A legged anchoring mechanism for capsule endoscopes using micropatterned adhesives
(2008)IEEE Transactions on Biomedical EngineeringThis paper presents a new concept for an anchoring mechanism to enhance existing capsule endoscopes. The mechanism consists of three actuated legs with compliant feet lined with micropillar adhesives to be pressed into the intestine wall to anchor the device at a fixed location. These adhesive systems are inspired by gecko and beetle foot hairs. Single-leg and full capsule mathematical models of the forces generated by the legs are analyzed ...Journal Article -
A biomimetic climbing robot based on the gecko
(2006)Journal of Bionic EngineeringThe excellent climbing performance of the gecko is inspiring engineers and researchers for the design of artificial systems aimed at moving on vertical surfaces. Climbing robots could perform many useful tasks such as surveillance, inspection, repair, cleaning, and exploration. This paper presents and discusses the design, fabrication, and evaluation of two climbing robots which mimic the gait of the gecko. The first robot is designed ...Journal Article -
Vision-based feedback strategy for controlled pushing of microparticles
(2008)Journal of Micro-Nano MechatronicsA strategy for controlled pushing is presented for microassembly of 4.5μm polystyrene particles on a flat glass substrate using an atomic force microscope probe tip. Real-time vision based feedback from a CCD camera mounted to a high resolution optical microscope is used to track particle positions relative to the tip and target position. Tip–particle system is modeled in 2D as a non-holonomic differential drive robot. Effectiveness of ...Journal Article -
Preface to the Journal of Micro-Nano Mechatronics
(2008)Journal of Micro-Nano MechatronicsOther Journal Item -
A New Biomimetic Adhesive for Therapeutic Capsule Endoscope Applications in the Gastrointestinal Tract
(2007)Gastrointestinal EndoscopyJournal Article -
Evidenzbasierte Beurteilung der konservativen Behandlungsmöglichkeiten des Patellaspitzensyndroms
(2003)Sportverletzung SportschadenEinleitung: Das Patellaspitzensyndrom ist ein sportinduzierter, degenerativer Sehnenschaden, der oft mit Schmerzen verbunden ist. Allgemein akzeptierte konservative Behandlungsstrategien gibt es nicht. Methoden: Mithilfe der evidenzbasierten Methodik wird untersucht, ob und welche konservative Methoden sich zur Behandlung dieser Indikation eignen. Resultate: 5 wissenschaftliche Beiträge konnten identifiziert werden, die der klinischen ...Journal Article -
Coupled rotation within single F₀F₁ enzyme complexes during ATP synthesis or hydrolysis
(2002)FEBS LettersF0F1 ATP synthases are the smallest rotary motors in nature and work as ATP factories in bacteria, plants and animals. Here we report on the first observation of intersubunit rotation in fully coupled single F0F1 molecules during ATP synthesis or hydrolysis. We investigate the Na+-translocating ATP synthase of Propionigenium modestum specifically labeled by a single fluorophore at one c subunit using polarization-resolved confocal microscopy. ...Journal Article -
Single-molecule identification by spectrally and time resolved fluorescence detection
(2000)Analytical ChemistryA method to identify single molecules rapidly and with high efficiency based on simple probability considerations is proposed. In principle, any property of a detected photon in a single-molecule fluorescence experiment, e.g., emission wavelength, arrival time after pulsed excitation, and polarization, can be analyzed within the framework of the outlined methodology. Monte Carlo simulations show that less than 500 photons are needed to ...Journal Article -
Orientation dependence of fluorescence lifetimes near an interface
(2002)The Journal of Chemical PhysicsThe fluorescence lifetime of single DiI-dye molecules in a 20 nm polymer film on glass is measured as a function of the orientation of the absorption dipole moment. A strong dependence of the lifetime on the orientation of the dye molecules relative to the polymer/air interface is found. Molecules with a dipole moment perpendicular to the interface exhibit a lifetime which is by a factor of longer than the lifetime of molecules with ...Journal Article