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The water from taps labelled "Industrial Water, Do Not Drink" comes from the same potable water line as domestic taps. The line should be split somewhere in the building, with the industrial line containing multiple backflow inhibitors to prevent cross contamination of potable or domestic water. Based on that fact, the water should be safe for hand washing, ...


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There can be several reasons for variability and since you said that the machine has not been serviced for a long time, I guess that should be one main source of errors. Multichannel pipettes can also sometimes cause problems (based on personal experience) and it is mostly because the tips don't fit properly in all channels. Try varying some parameter (for ...


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8M urea is a denaturant, as @Chris mentioned. Denaturing proteins is important for molecular (aka classical) mass spectrometry. If you analyzed a non-denatured protein, you'd get information not only on the primary structure, but also on noncovalent interaction (2+°): The classical MS approach, so-called “molecular MS,” analyzes, in the gas phase of the ...



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