Abstract: The invention provides methods and compositions, including, without limitation, algorithms, computer readable media, computer programs, apparatus, and systems for determining the identity of nucleic acids in nucleotide sequences using, for example, data obtained from sequencing by synthesis methods. The methods of the invention include correcting one or more phenomena that are encountered during nucleotide sequencing, such as using sequencing by synthesis methods. These phenomena include, without limitation, sequence lead, sequence lag, spectral crosstalk, and noise resulting from variations in illumination and/or filter responses.

Abstract: Methods and compositions for enriching a population of particles containing an analyte are disclosed. In one embodiment, enrichment beads are used that are larger in size than the beads used for amplification. A separation device is employed that can retain larger beads with bound amplified beads. The technique finds many uses, including enriching for beads with clonally amplified template, which can be used in a variety of assays, including nucleic acid sequencing.

Abstract: The invention provides methods and compositions, including, without limitation, algorithms, computer readable media, computer programs, apparatus, and systems for determining the identity of nucleic acids in nucleotide sequences using, for example, data obtained from sequencing by synthesis methods. The methods of the invention include correcting one or more phenomena that are encountered during nucleotide sequencing, such as using sequencing by synthesis methods. These phenomena include, without limitation, sequence lead, sequence lag, spectral crosstalk, and noise resulting from variations in illumination and/or filter responses.

Abstract: Modular flow cells, devices with modular flow cells, and methods of sequencing using modular flow cells, as well as systems and kits including modular flow cells, are described, permitting sequencing wherein less than the full capacity for sequencing is desired.

Abstract: The present invention discloses methods of applications of indole-3-propionic acid, L-carnitine and O-acetyl-L-carnitine in one or more different reactive steps of a sequencing-by-synthesis workflow. The reactive steps employing these compounds include, but are not limited to, cleaving, imaging, incorporating bases and washing. The use of these new compounds provides improved sequencing performance including, but not limited to, lower error rates, higher sequence outputs and/or longer read lengths.

Abstract: Imagers and alignment methods for use by imagers imaging deoxyribonucleic acid (DNA) fragments on a flow cell are disclosed. The imagers capture intensity values at DNA fragment bead locations in tiles with each tile having a reference location in the flow cell. Flow cells may be aligned by obtaining a dark field image of each tile during a first imaging session, identifying dark field constellations of bead locations within two separate tiles during the first imaging session, identifying corresponding constellations during a second imaging session, altering the reference location of at least one tile during the second imaging session to correct for a linear offset in the corresponding constellations, and applying at least one correction factor for reading out intensity values from the imager for the bead locations in the flow cell to correct for an angular offset determined from offsets in the corresponding constellations.

Abstract: Imagers and alignment methods for use by imagers imaging deoxyribonucleic acid (DNA) fragments on a flow cell are disclosed. The imagers capture intensity values at DNA fragment bead locations in tiles with each tile having a reference location in the flow cell. Flow cells may be aligned by obtaining a dark field image of each tile during a first imaging session, identifying dark field constellations of bead locations within two separate tiles during the first imaging session, identifying corresponding constellations during a second imaging session, altering the reference location of at least one tile during the second imaging session to correct for a linear offset in the corresponding constellations, and applying at least one correction factor for reading out intensity values from the imager for the bead locations in the flow cell to correct for an angular offset determined from offsets in the corresponding constellations.