The nanoVette micoliter accessory, for the Beckman Coulter DU 800 and DU 730 UV/Vis spectrophotometers, is a cuvette-sized unit that accepts sample sizes as small as 0.7 μl and is offered with interchangeable 0.2 mm and 1 mm path lengths. The nanoVette can be loaded and cleaned without being removed from the instrument. Samples can be recovered for future analysis. The DU 730 provides tools for protein and nucleic acid analysis, including determination of dye incorporation percentage for microarrays, and a set of DNA/protein calculation and conversion tools.