摘要:
A Method for identifying one or a small number of molecules, especially in a dilution of ≦1 μM, using laser excited FCS with measuring times ≦500 ms and short diffusion paths of the molecules to be analyzed, wherein the measurement is performed in small volume units of preferably ≦10−14 l, by determining material-specific parameters which are determined by luminescence measurements of molecules to be examined.The device which can be preferably used for performing the method according to the invention is a per se known system of microscope optics for laser focusing for fluorescence excitation in a small measuring compartment of a very diluted solution and for imaging the emitted light in the subsequent measurement through confocal imaging wherein at least one system of optics with high numerical aperture of preferably ≧1.2 N.A. is employed, the light quantity is limited by a confocally arranged pinhole aperture in the object plane behind the microscope objective, and the measuring compartment is positioned at a distance of between 0 and 1000 μm from the observation objective.
摘要:
The present invention relates to a spectroscopic method and associated apparatus and computer program for measuring and analysing intensities of fluorescent molecules excited by an energy pulse. The method includes the steps of: a) generating a transient state build-up in the fluorescent molecules by means of an excitation pulse, within which pulse repetitive excitation-emission cycles are induced in the fluorescent molecules between their ground, typically singlet (So) and excited, typically singlet (SO states, resulting also in transition from S] to the transient state, b) relaxation of population of the transient state by transition back to the ground state in a time period following directly after the excitation pulse, c) determination of the transient state population by recording the fluorescence. The invention is characterised by varying pulse characteristics from one sequence of pulses to the next so as to circumvent the need of time-resolution in the detection.
摘要:
The present invention provides a FCCS method for determining the concentration and/or the diffusion coefficient of at least a first labeled species, a second labeled species and/or a complex between said first and second labeled species, in a system, wherein the method comprises the steps of determining a cross-talk parameter K, wherein K is the ratio between the brightness of the first labeled species and the second labeled species at the centre of each focus, as detected for both species in the channel for detecting the second labeled species; using the cross talk parameter K for determining a displacement parameter ro and using K, ro, or both K and ro for determining the concentration and/or the diffusion coefficient of said first and/or a second labeled species and/or a complex between said first and second labeled species.
摘要:
The present invention relates to a spectroscopic method and associated apparatus and computer program for measuring and analysing intensities of fluorescent molecules excited by an energy pulse. The method includes the steps of: a) generating a transient state build-up in the fluorescent molecules by means of an excitation pulse, within which pulse repetitive excitation-emission cycles are induced in the fluorescent molecules between their ground, typically singlet (So) and excited, typically singlet (SO states, resulting also in transition from S] to the transient state, b) relaxation of population of the transient state by transition back to the ground state in a time period following directly after the excitation pulse, c) determination of the transient state population by recording the fluorescence. The invention is characterised by varying pulse characteristics from one sequence of pulses to the next so as to circumvent the need of time-resolution in the detection.
摘要:
A Method for identifying one or a small number of molecules, especially in a dilution of ≦1 μM, using laser excited FCS with measuring times ≦500 ms and short diffusion paths of the molecules to be analyzed, wherein the measurement is performed in small volume units of preferably ≦10−14 l, by determining material-specific parameters which are determined by luminescence measurements of molecules to be examined.The device which can be preferably used for performing the method according to the invention is a per se known system of microscope optics for laser focusing for fluorescence excitation in a small measuring compartment of a very diluted solution and for imaging the emitted light in the subsequent measurement through confocal imaging wherein at least one system of optics with high numerical aperture of preferably ≧1.2 N.A. is employed, the light quantity is limited by a confocally arranged pinhole aperture in the object plane behind the microscope objective, and the measuring compartment is positioned at a distance of between 0 and 1000 μm from the observation objective.
摘要:
A method is disclosed for analyzing particles or biomolecules in a liquid sample, including: detecting a signal and fluctuations in the signal from a detection volume in the sample; wherein the signal is generated from signal-generating molecules in the medium surrounding the particles or biomolecules and the fluctuations are transient reductions in the signal as the particles or biomolecules transit through the detection volume; and analyzing the detected fluctuations to obtain information about the particles or biomolecules in the liquid sample. At least one example embodiment of the present invention relates to a fluorescence correlation spectroscopy system including a laser, a zero-mode waveguide, guiding device for guiding the laser into the zero-mode waveguide, device for collecting fluorescence emission from excited molecules within the waveguide, a detector for detecting the fluorescence emission and means for autocorrelating the detected fluorescence signal, wherein the detector comprises a photomultiplier tube. Moreover, at least one embodiment relates to the use of a fluorescence correlation spectroscopy system for analyzing molecules of interest in a sample by detecting and analyzing fluctuations in a fluorescence signal that is generated from sample molecules surrounding the molecules of interest, wherein the fluctuations are transient reductions in the detected fluorescence signal.
摘要:
A Method for identifying one or a small number of molecules, especially in a dilution of ≦1 μM, using laser excited FCS with measuring times ≦500 ms and short diffusion paths of the molecules to be analyzed, wherein the measurement is performed in small volume units of preferably ≦10−14 l, by determining material-specific parameters which are determined by luminescence measurements of molecules to be examined. The device which can be preferably used for performing the method according to the invention is a per se known system of microscope optics for laser focusing for fluorescence excitation in a small measuring compartment of a very diluted solution and for imaging the emitted light in the subsequent measurement through confocal imaging wherein at least one system of optics with high numerical aperture of preferably ≧1.2 N.A. is employed, the light quantity is limited by a confocally arranged pinhole aperture in the object plane behind the microscope objective, and the measuring compartment is positioned at a distance of between 0 and 1000 μm from the observation objective.
摘要:
A method for identifying one or a small number of molecules, especially in a dilution of ≦1 &mgr;M, using laser excited FCS with measuring times ≦500 ms and short diffusion paths of the molecules to be analyzed, wherein the measurement is performed in small volume units of preferably ≦10−14 l, by determining material-specific parameters which are determined by luminescence measurements of molecules to be examined.