C
Charles W. Ragsdale
Researcher at Bio-Rad Laboratories
Publications - 34
Citations - 3291
Charles W. Ragsdale is an academic researcher from Bio-Rad Laboratories. The author has contributed to research in topics: Cuvette & Voltage. The author has an hindex of 10, co-authored 34 publications receiving 3223 citations.
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High efficiency transformation of E.coli by high voltage electroporation
TL;DR: E. coli can be transformed to extremely high efficiencies by subjecting a mixture of cells and DNA to brief but intense electrical fields of exponential decay waveform (electroporation), and most of the surviving cells are competent with up to 80% transformed at high DNA concentration.
Patent
Localized temperature control for spatial arrays of reaction media
TL;DR: In this paper, individual temperature control in multiple reactions performed simultaneously in a spatial array such as a multi-well plate is achieved by thermoelectric modules with individual control, with each module supplying heat to or drawing heat from a single region within the array, the region containing either a single reaction vessel or a group of reaction vessels.
Patent
Arc detection system
TL;DR: An arc detector for detecting electrical arcs across a break in a line carrying a current in an electrical system is described in this paper, where the line is broken, but current doesn't flow until an arc occurs across the break.
Patent
Imaging method and apparatus
TL;DR: In this paper, a method for measuring a response to a stimulus of a plurality of samples spots of a sample using a measuring system having a measurement range to generate an image of the sample in digital space.
Patent
Transfection high-voltage controller
TL;DR: In this paper, a transfection high-voltage controller that provides features for measuring actual load resistance, and compensating for any effects of a limit impedance in series with the load is presented.