摘要:
The present invention provides protein-based biomarkers and biomarker combinations that are useful in qualifying ovarian cancer status in a patient. In particular, the biomarkers of this invention are useful to classify a subject sample as ovarian cancer or non-ovarian cancer. The biomarkers can be detected by SELDI mass spectrometry.
摘要:
The invention provides an integrated optical waveguide sensor module (200) with reduced signal modulation and increased sensitivity. An optical waveguide sensor module (200) comprises an optically transparent substrate (210) having a first and a second interface and an optical waveguide film (220) disposed on the substrate (210) with the first interface (225) therebetween, wherein the film (220) comprises at least one grating pad (235) that is optically coupled therewith. The substrate (210) and the optical waveguide film (220) are configured to reduce parasitic interference within the substrate.
摘要:
A mass spectrometer probe is formed of a nonconductive polymer that is doped with conductive material. The probe may be used as, or as part of, a repeller plate in a parallel laser ion desorption/ionization time-of-flight mass spectrometer. Transparent locations on the probe enable a sample placed thereon to be visualized before or during mass spectrometry. The conductive nature of the probe maintains the consistency of the electromagnetic field applied to the sample. The probe also displays low outgassing and high mechanical and chemical stability, thereby enabling it to be used repetitively.
摘要:
The present invention provides a protein-based biomarker that is useful in qualifying ovarian cancer status in a patient. In particular, the biomarker of this invention is useful to classify a subject sample as ovarian cancer or non-ovarian cancer. The biomarker can be detected by SELDI mass spectrometry.
摘要:
Laser desorption/ionization time-of-flight mass spectrometer (“LDI-TOF-MS”) devices, and methods, that accurately measure the mass of analytes contained in a sample and which also measure the quantities of analytes present in a sample in a consistent manner from instrument-to-instrument and over time on a single instrument. In particular, the invention provides LDI-TOF-MS devices and methods in which: 1) the energy of the laser pulse and the area of the sample illuminated (fluence) is consistent and controlled so as to produce consistent conditions for analyte desorption and ionization; 2) the mass analyzer behaves in a reproducible manner; and 3) the detection system produces a signal that consistently represents the arrival of ions of different masses.
摘要:
Polyurethane polymers bearing multiple reactive groups are readily prepared from easily accessible precursors. The reactive groups of the polymers are then derivatized with binding functionalities for analytes, energy absorbing molecules for matrix assisted laser desorption/ionization mass spectrometry, fluorescent moieties and the like. The reactive groups can also be converted to different reactive groups having a desired avidity or specificity for a selected reaction partner. The polymers are incorporated into devices of use for the analysis, capture, separation, or purification of an analyte. In an exemplary embodiment, the invention provides a substrate coated with a polymer of the invention, the substrate being adapted for use as a probe for a mass spectrometer.
摘要:
The invention provides apparatus and methods for performing time-of-flight (TOF) mass spectrometry. A TOF mass spectrometer of the present invention comprises one or more ion focusing electric sectors. At least one of the electric sectors is associated with an ion optical element. The ion optical elements comprise at least one adjustable electrode, such that the adjustable electrode is able to modify the potential experienced by an ion entering or exiting the electric sector with which it is associated.
摘要:
The present invention provides a polymer that includes a trace amount of a luminescent moiety. The polymers have unique properties that make them ideally suited for use in diverse analyses, including desorption/ionization mass spectrometry of analytes. The invention also provides a device that incorporates the polymeric compositions of the inventions, methods of using the device to detect, quantify and identify analytes, and a method of preparing a device of the invention. The luminescent moiety provides a detectable tracer that allows for a rapid, simple quality control assay of devices that incorporate the polymer.
摘要:
An improved electron multiplier bias network that limits the response of the multiplier when the multiplier is faced with very large input signals, but then permits the multiplier to recover quickly following the large input signal. In one aspect, this invention provides an electron multiplier, having a cathode that emits electrons in response to receiving a particle, wherein the particle is one of a charged particle, a neutral particle, or a photon; an ordered chain of dynodes wherein each dynode receives electrons from a preceding dynode and emits a larger number of electrons to be received by the next dynode in the chain, wherein the first dynode of the ordered chain of dynodes receives electrons emitted by the cathode; an anode that collects the electrons emitted by the last dynode of the ordered chain of dynodes; a biasing system that biases each dynode of the ordered chain of dynodes to a specific potential; a set of charge reservoirs, wherein each charge reservoir of the set of charge reservoirs is connected with one of the dynodes of the ordered chain of dynodes; and an isolating element placed between one of the dynodes and its corresponding charge reservoir, where the isolating element is configured to control the response of the electron multiplier when the multiplier receives a large input signal, so as to permit the multiplier to enter into and exit from saturation in a controlled and rapid manner.