35 results about "Total internal reflection fluorescence microscope" patented technology

A microscope for use in total internal reflection fluorescence microscopy (TIRFM) is provided. The microscope includes a first white-light source for directing light along a first optical path; an annular slit member disposed in the first optical path, the annular slit member having an annular slit for blocking all but an annulus of light corresponding to the annular slit; and an objective lens for directing the annulus of light to a specimen such that TIRFM of the specimen is achieved. Also provided are various ways for converting the microscope to and from a TIRFM microscope and a conventional microscope.

The invention discloses a confocal and annular total internal reflection dual-mode microscope system based on a scanning galvanometer, the confocal and annular total internal reflection dual-mode microscope system includes a light source and a movable first dichroic mirror, the first dichroic mirror is arranged on an optical path, and is used for transmitting excitation light and reflecting fluorescence; a first fluorescence detector is arranged on the reflective optical path of the first dichroic mirror; a two-dimensional scanning galvanometer, a mobile first mirror and a rotatable second mirror are arranged on the transmission optical path of the first dichroic mirror in turn; a mobile second dichroic mirror and a sample table on the reflective optical paths of the first mirror and the second mirror are arranged; a second fluorescent detector on the reflective optical path of the second mirror is also arranged; and a processing controller for controlling and processing is also arranged; the confocal and annular total internal reflection dual-mode microscope system has a laser scanning confocal microscope mode and an annular total internal reflection fluorescence microscope mode,the use efficiency of the system is improved, and the structure of the system is simplified.

Correction elements that can be incorporated in objective-based TIRF microscopy instruments to correct for chromatic aberrations are described. A correction element can be placed between a multiple wavelength excitation beam source and the microscope objective lens. In one aspect, the thickness of the correction element is defined to compensate for different axial positions of the focal points associated with each excitation wavelengths traveling along the outer edge of lenses comprising a microscope objective lens. In another aspect, the correction element can be angled and/or configured so that the different wavelengths of multiple wavelength excitation light are shifted to adjust the angle of incidence for each wavelength at the specimen/substrate interface.

The invention discloses a method for simultaneously detecting protein, RNA and exosome membrane protein in exosome, and belongs to the technical field of exosome detection. The method comprises the following steps: capturing exosome in a sample; detecting the corresponding membrane protein; preparing nano particles; fusing the nanoparticles with the exosome; photographing and imaging by a total internal reflection fluorescence microscope, and analyzing and processing data. Verification is carried out in the aspects of exosome characterization detection, cell supernatant exosome membrane protein and mRNA expression comparison experiments, human plasma exosome specificity detection, human plasma exosome membrane protein comparison experiments and detection of various human plasma exosome intracellular proteins, RNA and membrane proteins. Compared with an existing recognized exosome detection technology, a comparison experiment shows that the same marker detection result of the technologyfor simultaneously detecting the same sample is consistent with that of the recognized technology, and the technology can be used for simultaneously detecting protein, RNA and exosome membrane protein in the exosome and judging the sample difference.

The invention discloses a single molecule fluorescence apparatus and an application method thereof. The single molecule fluorescence apparatus comprises a lens-type full internal reference fluorescence microscope system, an image acquisition and processing system, a controllable magnetic tweezer system and a fluid pool system. The fluid pool system comprises a fluid pool fixed station, a fluid pool and an electric liquid flow pump; one side of the fluid pool fixed station is fixed on a sample stage of an inverted microscope of the full internal reference fluorescence microscope system, and the other side of the fluid pool fixed station is fixed with the fluid pool. The electric liquid flow pump and the fluid pool are connected; and the bottom of the fluid pool is equipped with more than one column of DNA fixed points. Columns of DNA fixed points are arranged in the fluid pool, so controllable fixing of a large amount of DNA can be realized. Through the transverse magnetic tweezer system, controllable drawing on a large amount of DNA molecules can be realized; and high precision observation on protein fluorescence signals can be realized without dyeing on DNA molecules.

A condenser lens is disposed in a position facing an objective lens via a specimen, a reflection mirror is movably disposed in the vicinity of an outermost part of a transmitted illuminative light path on the side of a transmitted illuminative light source from the condenser lens, and a laser beam output from a laser oscillation unit is reflected by the reflection mirror and is incident upon the condenser lens.

The invention belongs to the technical field of spectrum detection systems and in particular relates to a fluorescence-related spectrum measurement system. Exciting light is limited within a flying volume by utilizing a tapered optical fiber, and meanwhile, a fluorescence signal is collected by utilizing an optical fiber, so that time-related photo counting is performed, and furthermore, a fluorescence-related spectrum is acquired. By using the method, a fluorescence confocal microscope, a total internal reflection fluorescence microscope or a two-photon fluorescence microscope is prevented from being used, so that the measurement cost of a fluorescence-related spectrum is reduced; meanwhile, the optical fiber can be penetrated into a solution, a reactor, a microfluidic chip, a cell or a body, so that space imitation of imaging equipment is eliminated; and the fluorescence-related spectrum measurement system can be widely applied to the aspects such as reaction dynamic research, livingcell analysis, biological detection, disease diagnosis and drug screening in the fields of life sciences, physics and chemicals.

The invention discloses a method for detecting the lateral limitation area of a living plant cytomembrane protein. The method comprises the following steps of (1) enabling a plant to express a fusion protein, so as to obtain a transgenic plant material which performs monochrome fluorescently labeling on the to-be-detected protein; (2) observing the transgenic plant material by using a variable-angle total internal reflection fluorescence microscope, so as to obtain a time sequence image; (3) recognizing and tracing a phosphor dot in a time series sequential image by using a single particle tracer technique, so as to obtain the trace of the phosphor dot along with the time and further calculate the mean square displacement of the phosphor dot along with the time; (4) fitting the mean square displacement of the phosphor dot along with the time by using Origin software, so as to obtain the corresponding constant, and calculating the moving range of the phosphor dot. The method for calculating the lateral limitation area of the living plant cytomembrane protein is simple, has good repeatability, can calculate the individual information of the protein and can calculate the population mean information.

The invention is directed to illumination optics for an optical device for observing a sample, particularly for TIRF microscopy (Total Internal Reflection Fluorescence Microscopy), wherein the sample is positioned on the side of a carrier glass remote of the illumination optics and the illumination light exiting from the illumination optics is shaped into an illumination beam bundle which encloses an angle not equal to 90° with the normal to the surface of the carrier glass. According to the invention, the illumination optics of the type mentioned above comprise at least two optically active elements which influence the shape and direction of the illumination beam bundle and which are arranged outside of the detection beam path that guides light coming from the sample to a detector. The optically active elements are preferably constructed as annular lenses and are arranged concentrically around the detection beam path.

The invention discloses a detection method of a trace amount of a target based on monomolecular fluorescent sensing. The detection method comprises the following steps of: (1) preparing a standard solution containing a target object; (2) fixing an auxiliary probe on a slide, adding an aptamer, and hybridizing the auxiliary probe with the aptamer; (3) adding the standard solution to the slide, andbinding the target object with the aptamer to separate the target object from the auxiliary probe; (4) adding a signal probe to the slide, and carrying out transient hybridization on the signal probeand the released auxiliary probe; (5) placing the slide on an object stage of a total internal reflection fluorescence microscope for detection, recording single-molecule fluorescence points with thenumber of times of change of the fluorescence state being more than 15 times, taking the single-molecule fluorescence points as an ordinate and taking the concentration of the target object in the standard solution as an abscissa to make a standard curve; and (6) repeating the steps (3) to (5) for a sample to be detected, recording single-molecule fluorescence points with the number of times of change of the fluorescence state being more than 15 times, and obtaining the concentration of the target object in the sample to be detected according to the standard curve.

The invention provides a method for observing the distribution and dynamic states of proteins on a stomatal guard cell membrane at a single-molecule level, belonging to the field of biotechnology. Themethod comprises the following steps: A, acquiring a transgenic material in which a target gene is fluorescently labeled; B, acquiring the real-time images of proteins on a guard cell membrane by using a total internal reflection fluorescence microscope; C, processing the time series images by using the Image J software; D, carrying out single-particle tracing analysis on target proteins via Matlab R2014a so as to determine the dynamic state of each individual protein polymer; E, calculating the dwell time of the proteins on the cell membrane; and F, subjecting the dwell time parameters of the target proteins to Gaussian Fitting so as to determine the dwell time and changes of the target proteins. The method has the advantages of capacity of improving the signal-to-noise ratio of imagingand realizing high-resolution observation, fast imaging speed, in-vivo visibility and high repeatability. The method has practical application value in the research of the functions of plant genes.

The invention discloses a synchronous monitoring method for chemical signals and electric signals of a neural cell network. The method comprises the following steps of firstly, culturing a neural cellnetwork on a pretreated microelectrode array in situ; then dyeing neuron vesicles, and adding a buffer solution; observing the neural cell network by adopting a total internal reflection fluorescencemicroscope, and connecting a shooting camera and a controller of the microelectrode array with a pulse signal generator; and performing external stimulation on the neural cell network, starting the pulse signal generator, and synchronously collecting fluorescence signals and electric signals by the shooting camera and the controller of the microelectrode array respectively. The synchronous monitoring method is low in background signal and high in signal-to-noise ratio, has space-time resolution responsiveness, and can meet the monitoring requirements of the neural cell network; the method isstable in signal and high in sensitivity, can achieve imaging measurement for various neural cells and networks, and can achieve high-throughput analysis.

The invention discloses a total internal reflection fluorescence microscope capable of being used with an atomic force microscope and belongs to the field of optical microscopes. The fluorescence microscope comprises a support assembly, an imaging assembly, a base, a sample objective table of the atomic force microscope. The size of the support assembly can be adjusted according to the size of the sample objective table. In the imaging assembly, a bearing body is arranged on the base, a one-dimensional translation seat is arranged on the bearing body, a second connection seat is fixed on the bearing body, a lens cone lens is arranged in an inner cavity and a reflection mirror is arranged on the bearing body and under the lens cone lens. A lower base plate of a first connection seat of a U-type structure is fixed on the one-dimensional translation seat. A two-dimensional translation seat is fixed on the outer end of a left side arm of the first connection seat. A fiber coupler is arranged in the two-dimensional translation seat in a two-dimensional moving manner. The end part of a first lens and the end part of a second lens are arranged on two ends of a second through hole of the right side arm of the first connection seat. A dichroscope assembly is arranged on the second connection seat. An objective lens is fixed on the dichroscope. The objective lens is arranged in an objective lens installation seat in a height-adjustable manner.

The invention discloses a calibration device for the total internal reflection fluorescence microscope penetration depth. The device comprises a glass slide, square cover glass and a glass sheet, wherein the square cover glass covers the upper surface of the glass slide; the right sides of the square cover glass and the glass slide are aligned; the glass sheet is arranged on the glass slide; the left side edges of the glass sheet and the glass slide are in contact and are aligned; the lower surface of the glass sheet is supported by the direction cover glass; the lower surface of the glass sheet is uniformly coated with fluorescent dye. The invention also discloses a method for calibrating the total internal reflection fluorescence microscope penetration depth by using the calibration device. The device has the advantages that the structure is simple; the cost is low; the operation is convenient and flexible.

The invention discloses a target nucleic acid detection method and application thereof. In the first aspect, the invention provides a method for detecting target nucleic acid with a non-disease diagnosis purpose, and the method comprises the following steps: providing a substrate on which an RNA chain marked with a fluorescent reporter group is fixed; carrying out contact reaction on the Csm complex, Csm6 protein, a nucleic acid sample and a substrate, and washing the substrate after the reaction is finished; and respectively collecting fluorescence signals of the substrate before and after the reaction by using a total internal reflection fluorescence microscope, and obtaining the concentration of the target nucleic acid in the nucleic acid sample according to the fluorescence intensity change. The Csm complex recognizes the target nucleic acid to generate cA4, and further activates the activity of the non-specific cleavage single-stranded RNA of the Csm6 protein, so that the RNA chain anchored on the substrate is cleaved, the fluorescent reporter gene is dissociated along with the cleavage, and the amount of the fluorescent reporter group on the substrate is reduced. The high signal-to-noise ratio of the TIRFM is utilized to obtain obvious signals, and the accuracy and sensitivity of detection are improved.