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This paper presents the use of electrodeformation as a method for single cell mechanical characterization. Cells were placed between two microelectrodes with a rectangular AC electric field applied and cell deformation recorded. Numerical simulations were performed to model cell electrodeformation based on the Maxwell stress tensor formulation in which effects of cell electrical property variations...
A microfabricated array integrating large-displacement, out-of-plane, actuated microposts has been developed to apply mechanical strain to a biomaterial film. Across the array, uniform equibiaxial strains ranging from 0 to 10% can be applied simultaneously and cyclically to adherent cell populations, to determine cellular response to mechanical forces. This microfabricated platform is capable of providing...
This paper presents a semi-automated microrobotic system for adherent cell injection. Different from embryos/oocytes that have a spherical shape and regular morphology, adherent cells are flat with a thickness of a few micrometers and are highly irregular in morphology. Based on computer vision microscopy and motion control, the system coordinately controls a three-degrees-of-freedom microrobot and...
The high dielectric strength and high permittivity of water allow for its use for energy storage and switching in compact pulse power systems. A 10-Omega pulse generator with flowing water as dielectric and as the switching medium is presented here. It can provide a 10-ns pulse with a risetime of approximately 2 ns and an amplitude of up to 35 kV into a matched load. The system was operated in burst...
This paper presents a computer vision algorithm for visually detecting the contact between an end-effector and a target surface under an optical microscope. Without using additional sensors (e.g., proximity or force/touch sensors), this algorithm provides robustness and a sub-micrometer detection resolution. Fundamentally, after the establishment of a contact in the world frame, further vertical motion...
This paper presents a computer vision algorithm for visually detecting the contact between an end-effector and a target surface under an optical microscope. Without using additional sensors (e.g., proximity or force/touch sensors), this algorithm provides robustness and a sub-micrometer detection resolution. Fundamentally, after the establishment of a contact in the world frame, further vertical motion...
The invertebrate central nervous system is ideally suited for the study of neurophysiology, as the comparative size of the individual neuron is rather large; on the order of 20 to 200 microns. Intracellular recordings of these cells are accomplished with a modicum of difficulty to an investigator familiar with the anatomy of the specified invertebrate. Once a microelectrode is inserted in the cell,...
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