Abstract: The invention generally relates to analyzing yeast viability. More particularly, the invention relates to efficient and effective methods and compositions for accessing and measuring viability and concentration of yeast cells.

Abstract: The invention generally relates to analyzing yeast viability. More particularly, the invention relates to efficient and effective methods and compositions for accessing and measuring viability and concentration of yeast cells.

Abstract: The present invention generally relates to systems and methods for counting biomolecules or cells. In certain embodiments, the invention provides a cell counting or biomolecule counting system including: a covered chamber having a known height and configured to hold a suspension of biomolecules or cells in a sample; at least one fluorescent light source connected to at least one fluorescent light beam narrowing device; a bright-field light source connected to a bright-field light beam narrowing device; a microscope objective; a detection device; a fluorescent filter assembly to allow only excitation light to illuminate the sample and allow only emission light from the sample to be imaged by the detection device; and a movable light shutter to block bright-field light during fluorescent detection.