摘要:
Apparatuses and methods are described for parallel oligonucleotide synthesis of hundreds of different sequences and lengths at a time. Standard phosphoramidite chemistry is employed. The syntheses take place in a reaction plate compatible with the industrial standard microplate format to allow the use of readily available automated instruments for subsequent processing. Key parameters in reducing synthesis volume in small reaction wells are discussed. This invention provides solutions to the difficulties of low volume, high number synthetic reactions.
摘要:
Apparatus is described for ultrasensitive detection of single fluorescent particles down to the single fluorescent molecule limit in a fluid or on a substrate comprising means for illuminating a predetermined volume of the fluid or area of the substrate whereby to emit light including background light from the fluid and burst of photons from particles residing in the area. The photon burst is detected in real time to generate output representative signal. The signal is received and the burst of energy from the fluorescent particles is distinguished from the background energy to provide an indication of the number, location or concentration of the particles or molecules.
摘要:
Novel fluorescent labeling techniques and fluorescent labels are provided, employing high affinity non-covalently binding and intercalating fluorescent dyes and dsDNA. The dyes find application to provide highly sensitive labeling of nucleic acids in electrophoretic gels and as pre-prepared labels for binding to a wide variety of specific binding pair members. The DNA-dye fluorescer complex can be used for labels in diagnostic assays, detection of specific nucleic acid sequences, and the like.
摘要:
A fluorescent scanner for scanning the fluorescence from a fluorescence labeled separated sample on a sample carrier including a confocal microscope for illuminating a predetermined volume of the sample carrier and/or receiving and processing fluorescence emissions from said volume to provide a display of the separated sample.
摘要:
This invention relates to an absorbance detector particularly adapted to liquid chromatography testing. In modern chromatography techniques, light is focused within a small capacity test sample cell, and an optical system is provided to measure the absorbance of various frequencies of light to thereby identify the existence of selected compounds. Inaccuracies of presently available detecting devices result since localized heating within the test cell generates localized index of refraction variations which refract the light in a random fashion such that it is not sensed by the detector. Additional distorting effects are caused by imperfections in the optical surfaces of the system and turbulence due to fluid flow within the sample cell. In accordance with this invention, an appropriate phase conjugator in the form of a retroreflective array is placed in the path of light exiting the sample cell. The array redirects the light rays along their original paths such that they are again distorted but in a reverse sense from the original distortion. In this manner, all of the distorting effects are compensated for. In addition, various means are employed to eliminate the effects of specular reflection from the various optical elements within the system.
摘要:
The present invention discloses a method for rapid assessment of lung cancer therapy efficacy in a few days instead of weeks by conventional imaging methods. This method can also be used to detect relapse of the cancer and to improve the current TNM cancer staging method for more accurate prognosis. The rapid assessment of therapy efficacy is based on detecting circulating cancer cells in body fluid with high positive detection rate. The high positive detection rate is achieved by using qPCR amplification of multiple marker genes identified by in silico search of DNA sequence database. This invention also discloses a scoring method to calculate the cancer cell load based on qPCR results to correlate the amount of circulating cancer cells in lung cancer patients and predict the treatment outcomes.
摘要:
Novel fluorescent labeling techniques and fluorescent labels are provided, employing high affinity non-covalently binding and intercalating fluorescent dyes and dsDNA. The dyes find application to provide highly sensitive labeling of nucleic acids in electrophoretic gels and as pre-prepared labels for binding to a wide variety of specific binding pair members. The DNA-dye fluorescer complex can be used for labels in diagnostic assays, detection of specific nucleic acid sequences, and the like.
摘要:
The present invention discloses a method for rapid assessment of lung cancer therapy efficacy in a few days instead of weeks by conventional imaging methods. This method can also be used to detect relapse of the cancer and to improve the current TNM cancer staging method for more accurate prognosis. The rapid assessment of therapy efficacy is based on detecting circulating cancer cells in body fluid with high positive detection rate. The high positive detection rate is achieved by using qPCR amplification of multiple marker genes identified by in silico search of DNA sequence database. This invention also discloses a scoring method to calculate the cancer cell load based on qPCR results to correlate the amount of circulating cancer cells in lung cancer patients and predict the treatment outcomes.
摘要:
A densitometer apparatus for evaluating electrophoresis gel samples based on photothermal techniques. In accordance with this invention, electrophoresis gels are characterized by passing a heating light beam through the gel at a particular location. Light absorbed by the presence of staining dyes in that area causes heat evolution which generates a local index of refraction variation or a "thermal lens". A probe beam is passed through the sample in the area of the thermal lens a predetermined period of time after it is generated and the modification to the beam caused by the thermal lens is evaluated. For example, defocusing of the probe beam can be sensed by a detector which receives transmitted light through a limiting aperture. Various means of separating the heating and probe beams are disclosed, including use of separate lasers, crossed beams, modulation by plane of polarization, etc. One embodiment of this invention is particularly adapted for characterizing dry gels in which the heating beam is absorbed by the sample and the probe beam passes across the sample and is modified by a thermal lens generated in the air above the sample. Several embodiments are related to means for offsetting the probe beam from the heating beam for use with samples that are swept by the photothermal techniques in accordance with this invention offer advantages in terms of sensitivity over conventional transmission-type densitometers. These advantages enable increased sensitivity and facilitate the use of simplified staining techniques.
摘要:
This invention is based on the discovery of an association of Collapsin Response Mediator Protein-1 (CRMP-1) with tumor metastasis. The level of CRMP-1 protein or mRNA can be used as an indicator of cellular invasiveness and of a test compound's ability to alter cellular invasiveness. The level of CRMP-1 protein can also be altered, e.g., to reduce invasiveness.