摘要:
The present invention conerns a method of preparing an individual elongated nucleic acid molecule fixed onto a solid planar surface, comprising depositing the nucleic acid molecule onto a planar glass surface coated with a positively charged substance that increases the electrostatic interaction between the nucleic acid molecule and the surface, and which reproducibly elongates and fixes the nucleic acid molecule to the surface such that the single nucleic acid spans 20% to 60% of its curvilinear contour length, wherein the charge density is sufficient to maintain the nucleic acid molecule in an elongated state while allowing for a small degree of relaxation, and wherein the small degree of relaxation yields a gap of 0.5 µm to 5.0 µm when the elongated nucleic acid molecule is cut, and wherein the elongated fixed nucleic acid molecule remains individually manipulable and accessible for enzymatic and/or hybridization reactions.
摘要:
In a method and apparatus for determining the velocity of an elongated polymeric molecule, the molecule (105) is moved relative to one or more detection stations (101,.102, 103). Time correlated detection signals are used to determine velocity, length, and distance between landmarks on the molecule (105).
摘要:
A method for observing and determining the size of individual particles and for determining the weight distribution of a sample containing particles of varying size, which involves placing a deformable or nondefor- mable particle in a medium, subjecting the particle to an external force, thereby causing conformational and/or positional changes, and then measuring these changes. Preferred ways to measure conformational and positional changes include: (1) determining the rate at which a deformable particle returns to a relaxed state after termination of the external force, (2) determining the rate at which a particle becomes oriented in a new direction when the direction of the perturbing force is changed, (3) determining the rate at which a particle rotates, (4) measuring the length of a particle, particularly when it is at least partially stretched, or (5) measuring at least one diameter of a spherical or ellipsoidal particle. Measurements of relaxation, reorientation, and rotation rates, as well as length and diameter can be made using a light microscope connected to an image processor. Particle relaxation, reorientation and rotation also can be determined using a microscope combined with a spectroscopic device. The invention is' particularly useful for measuring polymer molecules, such as nucleic acids, and can be used to determine the size and map location of restriction digests. Breakage of large polymer molecules mounted on a microscope slide is prevented by condensing the molecules before mounting and unfolding the molecules after they have been placed in a matrix.
摘要:
Deformability of blood cells is quantified in a short time. A blood fluidity measurement apparatus is provided with a TV camera (6) which photographs a stream of blood in either two areas of the internal area (A), entrance area (B), and exit area (C) of a gate (30), an image processing part (7) which calculates the velocity of the blood cells contained in the blood from the image taken by the TV camera (6), and a deformability calculation means (81) which calculates the deformability of the blood cells a blood fluidity from the velocity.
摘要:
Blood fluidity is measured in a short time. A blood fluidity measurement system (1), which measures blood fluidity by flowing blood into a channel, is equipped with a TV camera (6) which photographs the blood stream in the channel and an image processing part (7) which detects the state of the blood stream in the channel as blood fluidity from the image taken by the TV camera (6).
摘要:
Deformability of blood cells is quantified in a short time. A blood fluidity measurement apparatus is provided with a TV camera (6) which photographs a stream of blood in either two areas of the internal area (A), entrance area (B), and exit area (C) of a gate (30), an image processing part (7) which calculates the velocity of the blood cells contained in the blood from the image taken by the TV camera (6), and a deformability calculation means (81) which calculates the deformability of the blood cells a blood fluidity from the velocity.
摘要:
In a method and apparatus for determining the velocity of an elongated polymeric molecule, the molecule (105) is moved relative to one or more detection stations (101,.102, 103). Time correlated detection signals are used to determine velocity, length, and distance between landmarks on the molecule (105).
摘要:
The present invention relates to a method and system for a label-free cell analysis based on Brillouin light scattering techniques. Combined with microfluidic technologies according to the present invention, Brillouin spectroscopy constitutes a powerful tool to analyze physical properties of cells in a contactless non-disturbing manner. Specifically, subcellular mechanical information can be obtained by analyzing the Brillouin spectrum of a cell. Furthermore, a novel configuration of Brillouin spectroscopy is provided to enable simultaneous analysis of multiple points in a cell sample.
摘要:
A system for deforming and analyzing particles includes a substrate defining an inlet, and an outlet; a fluidic pathway fluidly coupled to the inlet and the outlet and defining a delivery region upstream of a deformation region configured to deform particles, wherein the fluidic pathway comprises a first branch configured to generate a first flow, and a second branch configured to generate a second flow that opposes the first flow, wherein an intersection of the first flow and the second flow defines the deformation region; a detection module including a sensor configured to generate a morphology dataset characterizing deformation of the particles, and a photodetector configured to generate a fluorescence dataset characterizing fluorescence of the particles; and a processor configured to output an analysis of the plurality of particles based at least in part on the deformation dataset and the fluorescent dataset for the plurality of particles.
摘要:
A system is disclosed that enables the automated measurement of cellular mechanical parameters at high throughputs. The microfluidic device uses intersecting flows to create an extensional flow region where the cells undergo controlled stretching. Cells are focused into streamlines prior to entering the extensional flow region. In the extensional region, each cell's deformation is measured with an imaging device. Automated image analysis extracts a range of independent biomechanical parameters from the images. These may include cell size, deformability, and circularity. The single cell data that is obtained may then be used to in a variety of ways. Scatter density plots of deformability and circularity may be developed and displayed for the user. Mechanical parameters such as deformability and circularity may be gated or thresholded to identify certain cells of interest or sub-populations of interest. Similarly, the mechanical data obtained using the device may be used as cell signatures.