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Dear Guy,

The point is to be careful with 3M urea. Microwave heating can form
hot vapors and ultra-heated liquid. I wouldn't want this to get into
my eyes, wear goggles. The normal urea concentration in urine is
10-15 mM, and I would be careful if you wish to heat that as well...

>Search the CONFOCAL archive at
>http://listserv.acsu.buffalo.edu/cgi-bin/wa?S1=confocal
>
>Quoting Gayle Callis <[log in to unmask]>:
>
>  >
>  > CAUTION: Urea is a health hazard.  Harmful by inhalation, in contact with
>  > skin, and if swallowed.  Mechanical exhaust required.  Refer to MSDS for
>  > further information.
>  >
>
>Gayle,
>
>        Thanks for posting this useful technique but on what possible
>basis is urea a health hazard?  Should I stop going to the toilet
>forthwith to avoid possibly hazardous exposure?
>
>                                                       Guy
>
>--
>Associate Professor Guy Cox
>Electron Microscope Unit, F09
>University of Sydney NSW 2006
>+61 2 9351 3176
>
>Until 25th July:
>Instituto Gulbenkian de Ciencia, PT-2780-156, Oeiras, Portugal.
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Fred Indig, Ph.D