California Institute of Technology

Murray R Darrach

Ara N Chutjian

Otto J Orient

Dean Aalami

Mohammad Mehdi Mojarradi

Brent R Blaes

Roger G Kern

Gary R Burke

David Q Zhu

John A MacAskill

Tuan A Tran

John L Thomas

Ryan A Stern

Rembrandt Thomas Schaefer

Stojan M Madzunkov

Provided are methods and systems for rapidly and effectively characterizing a cell as belonging to a particular genus, species, strain, or having a particular phenotype. The methods and systems utilize mass spectrometry and low-energy negative ionization to detect cell surface markers indicative of a particular cell.

Detector using mass spectroscopy for characterization of biological community

The present invention discloses an mixed signal RF drive electronics board that offers small, low power, reliable, and customizable method for driving and generating mass spectra from a mass spectrometer, and for control of other functions such as electron ionizer, ion focusing, single-ion detection, multi-channel data accumulation and, if desired, front-end interfaces such as pumps, valves, heaters, and columns.

Electronic drive and acquisition system for mass spectrometry

A chemical sensing apparatus and method for the detection of sub parts-per-trillion concentrations of molecules in a sample by optimizing electron utilization in the formation of negative ions is provided. A variety of media may be sampled including air, seawater, dry sediment, or undersea sediment. An electrostatic mirror is used to reduce the kinetic energy of an electron beam to zero or near-zero kinetic energy.

Chemical sensor system

Driving a quadrapole mass spectrometer includes obtaining an air core transformer with a primary and a secondary, matching the secondary to the mass spectrometer, and driving the primary based on first and second voltage levels. Driving of the primary is via an isolating stage that minimizes low level drive signal coupling.

Quadrupole mass spectrometer driver with higher signal levels

The present invention provides an improved electron ionizer for use in a quadrupole mass spectrometer. The improved electron ionizer includes a repeller plate that ejects sample atoms or molecules, an ionizer chamber, a cathode that emits an electron beam into the ionizer chamber, an exit opening for excess electrons to escape, at least one shim plate to collimate said electron beam, extraction apertures, and a plurality of lens elements for focusing the extracted ions onto entrance apertures.

High-efficiency electron ionizer for a mass spectrometer array

Driving a quadrupole mass spectrometer includes obtaining an air core transformer with a primary and a secondary, matching the secondary to the mass spectrometer, and driving the primary based on first and second voltage levels. Driving of the primary is via an isolating stage that minimizes low level drive signal coupling.

Driving a quadrupole mass spectrometer via an isolating stage

A power supply for a quadrupole mass spectrometer which operates using an RF signal. The RF signal is controllable via a feedback loop. The feedback loop is from the output, through a comparator, and compared to a digital signal. An air core transformer is used to minimize the weight. The air core transformer is driven via two out of phase sawtooth signals which drive opposite ends of the transformer.

Growing community of inventors

Valencia, CA, United States of America

Murray R Darrach