Abstract: The invention concerns nucleic acid detection using a probe consisting of: a binding domain A, consisting of a single strand polynucleotide; and intermediate domain B, consisting of at least a stop synthon; and a display domain C, consisting of a double strand polynucleotide, wherein is incorporated at least a marked nucleotide constituting detection means. The use of said probes amplifies the hybridisation signal with nucleic acid target sequences.

Abstract: A method for preparing a copolymer of general formula (I) by electrochemically copolymerising a compound of general formula (II) with a compound [A], wherein [A] is a monomeric unit of a polymer capable of being produced by electrochemical copolymerisation, [B] is a side group that may be a monomer or a polymer and is bound to unit [A] by a covalent bond or via a spacer arm, and x and y are integers of a least 1. Said method includes a treatment enabling the surface reactivity of said copolymer to be reduced.

Abstract: A copolymer of general formula (I), wherein unit A is a monomer of an electronically conductive polymer, unit B is a nucleotide, an oligonucleotide or an analogue thereof, x, y, z are integers of 1 or higher or y is 0, and 1 is a covalent bond, or a spacer arm. Methods for preparing polymer (I) and its use, in particular for nucleic acid synthesis, sequencing and hybridization, are also disclosed.

Abstract: The invention relates to nucleoside derivatives bearing electrolabile protector groupings and their use in an oligonucleotide synthesis method comprising at least one step of electronic deprotection.

Abstract: A copolymer of general formula (I), ##STR1## wherein unit A is a monomer of an electronically conductive polymer, unit B is a nucleotide, an oligonucleotide or an analogue thereof, x, y, z are integers of 1 or higher or y is 0, and l is a covalent bond, or a spacer arm. Methods for preparing said polymer and its use, in particular for nucleic acid synthesis, sequencing and hybridization, are also disclosed.

Abstract: A method for preparing double stranded RNA, wherein the simultaneous transcription of two complementary DNA sequence strands in a single reaction mixture is preformed, and the two resulting transcripts are immediately hybridized. The double stranded RNA fragments may be used for detecting and/or assaying nucleic acid target sequences in a biological sample.

Abstract: This process comprises the following steps:a) make a set of chips (110, 111, 112, 113) on a substrate (100), each chip including a number of electrodes (110a, 110b, 111a, 111b),b) individual validity test on each chip and the formation of at least one electrical network (117a, 117b) for addressable matched electrodes on different valid chips,c) make a deposit successively on matched electrode sets by dipping the substrate in an appropriate electrochemical bath and by application of appropriate voltages on the electrical network to cause an electrochemical reaction on the electrodes.

Abstract: Process for RNA synthesis consisting in successively condensing necleosides for the formula (1) in which R.sup.1 is a puric pyrimidic optionally protected base, R.sup.2 is a leaving group such as the dimethoxytrityl radical, R.sup.3 is a phosphorus-containing radical, for example, phosphoramidite and R.sup.4 is a trialkylsilyl radical. The RNA obtained is then subjected to a protective treatment with a reagent of the formula (II), for example N(C.sub.2 H.sub.5).sub.3,3HF, to eliminate R.sup.4 protective groups of the 2' hydroxyl groups. Such reagent provides full deprotection in about ten hours, with an RNA of great length, for example, having more than 50 bases.

Abstract: A method for detecting specific nucleic acid sequences (a single sequence and/or a mixture of nucleic acid sequences) which are present in a biological sample, comprising at least one enzymatic amplification. Detection is carried out, after placing the biological samples in a solution in order to extract the nucleic acid, by enrichment with target sequences by putting the biological samples into contact with at least one pair of appropriate triggers, followed by at least one appropriate dilution of the obtained enrichment amplifying solution, and by putting a fraction of this solution into contact with at least one pair of triggers, followed by the detection of the obtained double-strand target nucleic acid copies. Applications in the diagnosis of genetic, infectious and tumoral diseases, in checking biological samples and in cell typing etc.

Abstract: The invention relates to derivatives of nucleosides and their use for the synthesis of oligonucleotides. These derivatives are in accordance with the formula: ##STR1## in which B represents a radical derived from guanine, cytosine or adenine, whose exocylic NH group is protected by the group ##STR2## with R.sup.1 representing a hydrogen atom or a alkyl radical and R.sup.2 a hydrogen atom, and alkyl radical, an alkoxy radical and optionally substituted aryloxy radical, R.sup.3 represents a hydrogen atom, the dimethoxytrityl radical or the radical ##STR3## R.sup.4 represents a hydrogen atom, the radical of formula: ##STR4## or a radical suitable for the synthesis of polynucelotides and R.sup.5 represents a hydrogen atom or the protected or unprotected hydroxyl OH radical.

Abstract: N4-(3-phenylproprionyl)-2'-deoxycytidine derivatives are disclosed having the following formula: ##STR1## wherein R.sup.1 is --CO--CH.sub.2 --CH.sub.2 --C.sub.6 H.sub.5, R.sup.5 is hydrogen, a trityl group or the group --CO--CH.sub.2 --CH.sub.2 --C.sub.6 H.sub.5, R.sup.6 is selected from the group consisting of hydrogen, --CO--CH.sub.2 --CH.sub.2 --C.sub.6 H.sub.5, ##STR2## and R.sup.7 is hydrogen or OH. These derivatives are useful in oligonucleotide synthesis because the 3-phenyl-proprionyl blocking group can be removed rapidly by ammonia.

Abstract: The invention relates to derivatives of nucleosides and their use for the synthesis of oligonucleotides.These derivatives are in accordance with the formula: ##STR1## in which B represents a radical derived from guanine, cytosine or adenine, whose exocylic NH group is protected by the group ##STR2## with R.sup.1 representing a hydrogen atom or an alkyl radical and R.sup.2 a hydrogen atom, and alkyl radical, an alkoxy radical and optionally substituted aryloxy radical, R.sup.3 represents a hydrogen atom, the dimethoxytrityl radical or the radical ##STR3## R.sup.4 represents a hydrogen atom, the radical of formula: ##STR4## or a radical suitable for the synthesis of polynucleotides and R.sup.5 represents a hydrogen atom or the protected or unprotected hydroxyl OH radical.