The invention relates to a method for assaying a biological or chemical sample comprising the following steps: illuminating the sample (10) by means of a light beam (17) from a source (11), producing an image including the image of the beam (18) diffused by the sample (10), analysing the image according to reference criteria, extracting information specific to the light/sample beam interaction, calculating the assay.


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> Carbon nanotube field effect transistor and methods for making same

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