Dear Peter Keen,
Acoustic microscopy or AFM?
Cheers,
David Knight
At 10:05 AM 2/27/03 +1300, you wrote:
>Hello,
>I've had an inquiry from a doctoral student who wishes to determine the
>hardness, relative or otherwise, of the integument of zooplankton that form
>the natural prey of crayfish phyllosoma. She originally proposed using a
>penetrometer but the ones available to her were far too large and it's my
>feeling that they all will be given the scale of her test subjects which
>range from a few millimetres to a couple of centimetres. We've considered a
>surface hardness instrument such as used for testing metal surface coatings
>but she was concerned that the storage of samples until returning from her
>sample collection cruise would affect the properties of the integument, and
>the instruments available to her cannot be taken on board the ship for
>testing while fresh. Another suggestion was to treat sorted samples in bulk
>and dissolve the calcium carbonate fraction away with EDTA to ascertain the
>% compostion ratio by weight which may be useful for the crustaceans but
>perhaps not for other species. Prey species include copepods, salps, and
>fish larvae. I'd appreciate any ideas anyone might have on this topic that
>we could explore prior to her departure on the sample collection cruise in
>mid-march. I look forward to responses with interest.
>
>
> Best Regards
>
> Peter Keen
> University of Auckland,
> School of Geography and Environmental Sciences
> Phone: 09 3737 599 ext 88536
> e-mail: [log in to unmask]
> http://www.auckland.ac.nz
>
>
> Best Regards
>
> Peter Keen
> University of Auckland,
> SGES
> Phone: 09 3737 599 ext 8536
> e-mail: [log in to unmask]
> http://www.auckland.ac.nz
>
>
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