Abstract: An optical device (1) includes a cavity (2) for which at least part is ellipsoidal with a first focus (F1) and a second focus (F2). The device includes means of presenting a medium containing components to be analyzed in the cavity at the first focus, and the device also includes means of transporting an excitation light beam in the cavity along a path also passing through the first focus (F1) to illuminate the medium at the first focus. The ellipsoidal part of the cavity includes a wall reflecting light emitted by the medium in response to the excitation light beam, and the device includes means (5) of collecting said emitted light at the second focus (F2).

Abstract: This invention relates to an optical device (1) including a cavity (2) for which at least part is ellipsoidal with a first focus (F1) and a second focus (F2), the device including means of presenting a medium containing components to be analysed in the cavity at the first focus, the device also including means of transporting an excitation light beam in the cavity along a path also passing through the first focus (F1) to illuminate the medium at the first focus. The ellipsoidal part of the cavity includes a wall reflecting light emitted by the medium in response to the excitation light beam, the device including means (5) of collecting said emitted light at the second focus (F2).

Abstract: The present invention concerns compositions and methods for analyzing, separating or sequencing nucleic acids. More particularly, it concerns methods for analyzing, separating or sequencing nucleic acids by electrophoresis, in particular capillary, more preferably gel-free. The invention also concerns methods for treating nucleic acids, or separating nucleic acids, applicable to rapid and efficient sequencing. The invention further concerns products, compositions and kits for implementing said methods. The invention consists particularly in the use of a positively charged carrier molecule, enabling to efficiently separate nucleic acids in solution. The invention is useful for analyzing, separating or sequencing nucleic acids of different type and origin, in the field of experimentation, diagnosis, medicine and the like, in particular de novo sequencing and genotyping.