摘要:
The invention provides a method for obtaining additional information about DNA mixtures arising from a variety of sources and/or a variety of concentrations. In particular, the invention provides a method for indicating the likelihood that a DNA mixture arose from sources of a defined type where: the DNA mixture is formed by DNA samples from more than one source, the method involving the determination of the identity of the alleles present at a locus for the DNA in the mixture; determining a first probability function for the situation where the DNA mixture is formed from samples arising from the given person and from a first other person; determining a second probability function for the situation where the DNA mixture is formed from samples arising from a second other person and a first other person; using the first probability function as numerator and the second probability function as denominator in determining a likelihood ratio for the mixture having arisen from the defined type of sources considered in the first probability function; determining such likelihood ratios for a plurality of loci; and combining the likelihood ratios to give a combined likelihood ratio for the mixture having arisen from the defined type of sources considered in the first probability function.
摘要:
The invention provides an improved method for obtaining information about DNA analysis of samples of uncertain origin by establishing the likelihood that they arose in certain manners compared with other possible manners. In this way all of the analysis information is taken into account and likelihood ratios are provided to express the results. The invention is particularly useful in analysing small DNA samples or DNA samples where the contribution from one or more sources is small.
摘要:
Primer mixtures and methods of investigating single nucleotide polymorphisms in samples of DNA are provided having particular primer sequences. The primer mixtures and methods are aimed at achieving optimised performance in multiplexes.
摘要:
A method for establishing the genotype of the locus is provided in which a series of calibration samples are analysed, the results being one of three indication types, a window being defined relative to the indication for each of the indication types, unknown samples being similarly analysed with the window that they fall within being taken to determine the indication type for the unknown sample and hence the genotype of the relevant locus. The technique provides a robust, reliable and accurate method of genotyping which is suited to automation.
摘要:
The invention provides methods for providing information on the probability of DNA samples being contaminated over days, weeks and months in relation to collection, processing and analysis of DNA samples. Methods are also provided for analyzing the likelihood of a result arising due to contamination and/or determining the analysis protocol to be applied to a DNA sample and/or methods of operating databases, particularly containing DNA profiles.Improvements in accounting for sporadic and undetected contamination and improvements in the operation of DNA sampling of analysis are provided by the invention.
摘要:
A variety of methods are provided which use a silicon or silicon dioxide channel to extract DNA from a sample and then release it at a later point. The extraction channels are simple to manufacture and reliable in use. Prior art problems with entrainment of gas, liquid and solid material within channels are addressed. The techniques provide a convenient way of controlling the amount or concentration of DNA in the eluant.
摘要:
A field-sensitive tag or label incorporates a layer for mechanically deactivating the tag resulting from subsequent use of the article to which the tag has been applied. To this end, a layered tag is provided which, in addition to the layers which are traditionally provided to achieve the function of a resonant circuit (e.g., substrate and etched outer layers), further incorporates a circuit-deactivating layer which preferably takes the form of an abrasive substance disposed in a suitable binder. The resulting layer can then operate to mechanically deactivate the tag by damaging at least a portion of the resonant circuit which comprises the tag due to movement of the article in subsequent use. The field-sensitive tag of the present invention is advantageously applied to footwear in regions where flexure of the tag can be anticipated, preferably in the sole, making the article well suited to placement in a self-service retail setting while maintaining an adequate degree of security.
摘要:
The invention provides methods for providing information on the probability of DNA samples being contaminated over days, weeks and months in relation to collection, processing and analysis of DNA samples. Methods are also provided for analysing the likelihood of a result arising due to contamination and/or determining the analysis protocol to be applied to a DNA sample and/or methods of operating databases, particularly containing DNA profiles.Improvements in accounting for sporadic and undetected contamination and improvements in the operation of DNA sampling of analysis are provided by the invention.
摘要:
A method of optimizing one or more parameters in a process for considering a DNA containing sample using a method of modeling and a method of modeling itself are provided. The method of modeling the process for considering a DNA containing sample uses a graphical model. The model seeks to provide one or more optimized parameters for the consideration process. The methods aim to consider the whole process, for instance, the number of cells required for the process and/or the extraction efficiency and/or the sub-sample volume relative to the sample volume and/or the amplification efficiency and/or the optimum number of amplification cycles and/or the effect of degradation on the amount of amplifiable DNA in the sample.
摘要:
A method for establishing the genotype of the locus is provided in which a series of calibration samples are analysed, the results being one of three indication types, a window being defined relative to the indication for each of the indication types, unknown samples being similarly analysed with the window that they fall within being taken to determine the indication type for the unknown sample and hence the genotype of the relevant locus.The technique provides a robust, reliable and accurate method of genotyping which is suited to automation.