The invention provides a polycation composition comprising a polysaccharide chain having an amount of saccharide units ranging from 2 to 2000, at least one oligoamine directly grafted to said polysaccharide chain per each segment of 5 saccharide units, wherein said oligoamine is selected from the group consisting of a linear, branched and cyclic alkyl amine having at least two amino groups, and at least one further grafted group selected from the group consisting of a hydrophobic and an amphiphilic group directly grafted to said polysaccharide chain per each segment of 50 saccharide units, wherein said hydrophobic or amphiphilic group includes an aliphatic chain of at least 4 carbons atoms.
COMPOSITIONS AND METHODS FOR RECOGNITION OF RNA USING TRIPLE HELICAL PEPTIDE NUCLEIC ACIDS
申请人:The Research Foundation for The State University of New York
公开号:US20140206838A1
公开(公告)日:2014-07-24
Peptide nucleic acids containing thymidine and 2-aminopyridine (M) nucleobases formed stable and sequence selective triple helices with double stranded RNA at physiologically relevant conditions. The M-modified PNA displayed unique RNA selectivity by having two orders of magnitude higher affinity for the double stranded RNAs than for the same DNA sequences. Preliminary results suggested that nucleobase-modified PNA could bind and recognize double helical precursors of microRNAs.
A method of assay for antigen comprising the following processes (A), (B), (C) and (D):
Process (A): A process in which the antigen to be assayed in the subject solution is bound with a functional group or marker to form a modified antigen.
Process (B) : A process in which the modified antigen is bound to a carrier via an antibody against the antigen and then the carrier is separated from the subject solution.
Process (C): The following process (a) or (b):
(a) A process in which the modified antigen is diassociated from the carrier.
(b) A process in which the modified antigen-antibody complex comprising the modified antigen and the antibody against the antigen is diassociated from the carrier.
Process (D): A process in which the modified antigen or modified antigen-antibody complex of Process (C) is assayed.
This method permits assay for antigens with high sensitivity based on characteristic features of the sandwich method, using an antibody against a single epitopic site, and also permits assay for low molecular substances, which have never been assayed by the conventional sandwich method, with higher sensitivity in comparison with the conventional competitive method.