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Dry ice is delivered on Tuesday mornings (before noon). The stash usually lasts all week but is gone some time over the weekend. There's not any remaining by Monday morning.
Quartz cuvettes for CD
For our old spectrophotometer, we had two macrocell QS quartz cuvettes and two microcell QS quartz cuvettes. I tested the quality of these four cuvettes for the purposes of CD (circular dichroism) using the CD spectrometer at the Bioinstrumentation facility. The two microcell cuvettes were not suitable for CD ... they have high birefringence. The two macrocell cuvettes were suitable for CD in the wavelenth range 224-320nm. However, for protein structures like alpha helices, you'll likely want to check the spectra even at 200nm. So these cuvettes are not great for this purpose. A cuvette for use in CD was purchased.