It's a very common problem: You need to determine the concentration of a molecule of interest spectrophotometrically but have only a few microliters of sample. Until now, there were not a lot of options. In the last year, World Precision Instruments has developed three instruments for just these sorts of microscale absorbence measurements. Dr. Su-Yi Liu, R&D scientist at World Precision Instruments, said that the company was originally formed "to develop instruments for electrophysiology but has moved into fiber optics in the last few years." Two of the company's products, the DipTip and the SpectroPette, enable researchers to take absorbence measurements with only a few microliters of sample in a microfuge tube. A third device-the MicroVette-is a capillary microcuvette that has a volume of only 4 µl but has a path length of 2.3 cm (over twice the standard pathlength of a 1 cm wide cuvette). The longer path length...

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