Abstract:
The invention relates to a biochip (1) comprising a support (2). One useful surface (2a) of the aforementioned support comprises an operating surface (3) having a network of basic sites (Xn) disposed thereon and numerous ligands which are fixed to the respectively different basic sites. The inventive biochip is characterised in that the basic sites are distributed between a central biological analysis area (4) and a peripheral area (5) which defines said central area and which comprises corners that are free of any basic sites.
Abstract:
Oligonucleotides used to prime in vitro nucleic acid amplification of 16S rRNA sequences or DNA encoding 16S rRNA sequences for many species within the genus Mycobacterium are disclosed. Kits including such oligonucleotides are disclosed. Methods of detecting Mycobacterium species using the oligonucleotides in in vitro nucleic acid amplification are disclosed.
Abstract:
A method for amplifying a target nucleic acid sequence by providing a polynucleotide such as VII including the sequence to be amplified as well as an RNA polymerase promoter sequence, and contacting said polynucleotide, in the presence of a system having RNA polymerase activity, RNA-dependent DNA polymerase activity, and DNA-dependent DNA polymerase activity, and capable of strand displacement, with a set of primers includinf a primer such as A capable of hybridising with a segment complementary to a portion of the sequence to be amplified, wherein A includes an upstream RNA polymerase promoter sequence then an arbitrary sequence, a primer such as D contains said RNA polymerase promoter sequence, and a primer such as C contains said arbitrary sequence. The elongation product of D is displaced by the elongation product of C, and the elongation product of D is thus obtained in the form of single-stranded VIII. Hybridisation of A on VIII followed by elongation forms double-stranded product X which can undergo transcription, with amplification, to give single-stranded RNA VII bis. An analogous system of 3 primers B, E and F similary produces single-stranded RNA VII from VII bis. Hence the amplification method, which can operate isothermally, is cyclic.
Abstract:
Polypeptides purifiés contenant des séquences caractéristiques communes aux pyrrolidone carboxylyl peptidases (PYRases) de bactéries, par exemple de Streptococcus pyogenes, ou contenant des fragments de ces séquences; anticorps reconnaissant ces polypeptides; polynuléotides codant pour de tels polypeptides ou fragments. Application notamment à la surproduction de PYRases par insertion, dans un vecteur d'un polynucléotide codant pour une PYRase, puis culture d'une cellule-hôte transformée à l'aide d'un tel vecteur, ou à la réalisation de sondes nucléiques spécifiques d'une bactérie ayant un gène, exprimé ou non, de PYRase. Ces sondes nucléiques peuvent être utilisées comme sondes de capture ou de détection, selon les techniques classiques d'hybridation.
Abstract:
1) Biopuce (1) comprenant un support (2) dont une face utile (2a) comprend une surface opératoire (3), un réseau de sites élémentaires (Xn) disposé sur ladite surface opératoire, et une multiplicité de ligands fixés chacun en nombre multiple en des sites élémentaires respectivement différents, caractérisée en ce que la face utile du support comprend ladite surface opératoire constituée par au moins une couronne opératoire (31) sur laquelle des sites élémentaires (Xn) sont distribués, et une surface non opératoire (4), pratiquement exempte de tout site élémentaire, disposée à l'intérieur ou au centre de ladite couronne opératoire.
Abstract:
A method of detecting rpoB sequences of Mycobacterium tuberculosis present in a biological sample that includes amplifying the M. tuberculosis rpoB sequence in vitro in a nucleic acid amplification mixture that includes specific primer sequences is disclosed. Compositions for detecting in vitro the rpoB sequences of M. tuberculosis in a sample are disclosed.
Abstract:
The invention concerns a sensor (1), in particular a biosensor, comprising an electrically or electronically insulating support (2), including at least one active surface (20), a plurality of electrically or electronically conductive electrodes (31, 32), arranged on the active surface (2a) of the support in a predetermined operative arrangement, exposed, that is said electrodes can be jointly placed in contact with a common external medium, for example a liquid medium; a plurality of electric terminals (4) respectively corresponding to said electrodes (4), arranged on the active surface (2a, 2b) of the support, exposed, that is said terminals can be electrically or electronically connected outside, independently of one another; a plurality of electrically or electronically conductive strips (5), extending along one (2a) and/or the other (2d) of the support surfaces, connecting the plurality of electrodes (31, 32) respectively to the plurality of terminals (4); an electrically or electronically insulating material layer (6), coating one (2a) and/or the other (2b) of the support surfaces, covering at least part of said strip conductors and exposing both the electrodes (31, 32) and the terminals (5). The invention is characterized in that, in combination, the plurality of electrodes (4) is arranged in an end zone (1a) opposite another end zone wherein electric terminals (5) are assembled together and the support (2) comprises at least one flexible zone (1c), located between the two end zones.
Abstract:
Capteur (1), en particulier biocapteur, comprenant: un support (2) isolant électrique ou électronique, comprenant au moins une face utile (20), une multiplicité d'électrodes (31, 32) électriquement ou électroniquement conductrices, disposées sur la face utile (2a) du support selon tout arrangement opératoire prédéterminé, découvertes, au sens où lesdites électrodes peuvent être mises au contact ensemble avec un même milieu extérieur, par exemple liquide, une multiplicité de bornes électriques (4) correspondant respectivement auxdites électrodes (4), disposées sur une face utile (2a, 2b) du support, découvertes, au sens où lesdites bornes peuvent être connectées à l'extérieur, électriquement ou électroniquement, de manière indépendante les unes par rapport aux autres, une multiplicité de pistes (5) électriquement ou électroniquement conductrices, cheminant chacune sur l'une (2a) et/ou l'autre face (2b) du support, reliant la multiplicité d'électrodes (31, 32) respectivement à la multiplicité de bornes (4), une couche (6) d'un matériau électriquement ou électroniquement isolant, revêtissant l'une (2a) et/ou l'autre (2b) faces du support (2), d'une part en recouvrant au moins en partie lesdites pistes (5), et d'autre part en découvrant et les électrodes (31, 32) et les bornes (5), caractérisé en ce que, en combinaison, d'une part la multiplicité d'électrodes (4) est disposée dans une zone extrême (1a) à l'opposé d'une autre zone extrême dans laquelle des bornes (5) électriques sont regroupées ensemble, et d'autre part le support (2) comporte au moins une zone flexible (1c), située entre les deux zones extrêmes.
Abstract:
The invention concerns a DNA chip (1) comprising a support (2) whereof the useful surface (2a) comprises an operating surface (3), a network of elementary sites (Xn) arranged on said operating surface, and a plurality of ligands fixed each in multiple number in respectively different elementary sites. The invention is characterized in that said useful surface of the support comprises said operating surface consisting of at least one operating ring (31) whereon elementary sites (Xn) are distributed, and a non-operating surface (4), practically free of any elementary site, arranged inside or at the center of said operating ring.
Abstract:
A target nucleic acid sequence (12) may be amplified in the presence of an enzymatic system including DNA polymerase, strand translocation and RNAse H activities by using a chimeric primer (A1, A2) that includes, in the 5' to 3' direction, an RNA-type segment capable of hybridising with a 3'-terminal segment of the target and a DNA-type segment capable of hybridising with a segment adjacent to said 3'-terminal segment of the target, and a DNA- or RNA-type primer B1 capable of hybridising with said 3'-terminal segment of the target. A cyclic amplification is achieved that may be implemented isothermally on the basis of either a DNA or an RNA target even when the terminals are not defined.