摘要:
The invention relates to a method for detecting organisms in a liquid sample, comprising the provision of a capture area including particles in a liquid medium and subjected to a hydrodynamic flow, wherein the organisms to be detected are capable of binding to these particles, the method comprising the steps of: (a) circulating the sample through the capture area; (b) circulating a growth medium through the capture area; and (c) determining the presence, nature or concentration of organisms in the capture area; said particles being retained in the capture area as a fluidized bed for at least one part of these steps. The invention also relates to a system for implementing this method.
摘要:
The invention relates to a method for detecting organisms in a liquid sample, comprising the provision of a capture area including particles in a liquid medium and subjected to a hydrodynamic flow, wherein the organisms to be detected are capable of binding to these particles, the method comprising the steps of: (a) circulating the sample through the capture area; (b) circulating a growth medium through the capture area; and (c) determining the presence, nature or concentration of organisms in the capture area; said particles being retained in the capture area as a fluidized bed for at least one part of these steps. The invention also relates to a system for implementing this method.
摘要:
The present invention concerns a microfluidic device (1) for performing physical, chemical or biological treatment to at least one packet without contamination.
摘要:
A collection of colloidal particles in the form of one or several chains, in which the chains are generated in an irreversible manner and have at least one recognition site for a species, the site being different from sites implicated in the linear organisation of the particles. The invention further relates to a method for production of the collection, particularly for detection and/or dosage of at least one species in a fluid and a surface element functionalised by a collection of colloidal chains and a hybridisation network including such a surface element.
摘要:
An integrated microfluidic element (1) composed of two juxtaposed plates (3, 5) bonded together, wherein at least one plate (3) has an etched structure or pattern of channels (7) on the surface facing the other plate (1) to form sealed micro channels (7), said element having micro spacers or posts (11) distributed over the etched surface of said one plate outside of said etched structure or pattern, and walls (9) surrounding said channels (7), said walls (9) having a height equal to that of said spacers or posts (11); and a method for the manufacture of such integrated microfluidic element.
摘要:
The invention concerns a microfluidic system (1) comprising: at least one channel (2) for the flow of fluid having an inlet (4), an outlet (5) and a longitudinal axis (7) extending between the inlet (4) and the outlet (5), said channel (2) comprising a capture zone (3), and the cross section of the channel (2) orthogonal to the longitudinal axis (7) of the channel (2) increasing in size in the capture zone (3), from the inlet (4) towards the outlet (5) of the channel (2); and means (6) for applying a magnetic field having a decreasing intensity in the capture zone (3) of the channel (2), from the inlet (4) towards the outlet (5) of the channel. The invention also concerns a method for treating a sample that can be implemented with this system.
摘要:
The present invention relates to a method for assaying the presence or the absence of at least one mutation on a strand of nucleic acid paired in a duplex form comprising at least the steps of contacting said duplex with at least one compound able to undergo a specific base pairing interaction with suspected mismatch and assaying for said mismatch by an analytical method. The invention further relates to the use in the diagnosis of predisposition to genetic diseases and cancers and in the diagnosis and prognosis of said diseases and cancers, like human breast cancer. The invention also relates to compositions including a compound able to undergo specific base pairing interaction, in association with a DNA fragment having a nucleic sequence relating to a gene on which point mutation(s) has been associated or putatively associated with a genetic disease or an increased predisposition to said disease.
摘要:
The present invention relates to a method for detecting point mutation(s) and/or large scale alteration(s) relative to at least one nucleic acid fragment said method comprising at least the steps of providing a sample liable to contain said nucleic acid fragment and at least a second nucleic acid fragment acting as a quantitative reference, subjecting said fragments to suitable conditions for obtaining a product containing homoduplexes and possible heteroduplexes, conducting on said product an analytical method suitable for obtaining at least signal(s) discriminating the existing duplex form(s) of the first nucleic acid fragment and relative quantitative data concerning said first nucleic acid fragment The invention further relates to the use of this method in the diagnosis of predisposition to genetic diseases and cancers and in the diagnosis and prognosis of said diseases and cancers, like human breast cancer.
摘要:
The invention concerns a method for separating particles or molecules whereby these particles or molecules are introduced in a separating medium and a moving force is applied to them in said medium. The method is characterised in that the separating medium is a ferrofluid, i.e. a colloidal suspension of magnetic particles and a magnetic field is applied to this ferrofluid generating therein at least an alternation of a zone rich in magnetic particles and a zone poor in magnetic particles, part at least of the region of the ferrofluid in which this alternation is generated is passed through by the particles or molecules to be separated during their migration.
摘要:
In order to separate, within a fluid (1), certain particles (2) contained therein, this fluid is arranged in a corridor (C) partly defined by two faces which are close together and substantially parallel to each other and to the direction of separation E and an exciting field is simultaneously applied to the entire volume of fluid contained in this corridor, according to a direction having at least one component perpendicular to the direction E, which exciting field varies along the said direction in a curve consisting of a regular sequence of mutually identical asymmetric patterns, the mean of this field, taken at each instant along the direction E, being zero, and means are provided for repetitively varying the effect of the exciting field on the particles. The substantially parallel faces may be electrodes between which a potential difference source is connected for producing an electric field thereby exciting particles in the corridor (C). At least one of the electrodes has a corrugated surface with a sequence of asymmetric grooves transverse to the separation direction.