I wonder if...

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jsmaje
Posts: 616
Joined: Tue Aug 15, 2006 8:39 am
Location: Manchester UK

Post by jsmaje »

ZackG wrote:Which model are you looking at?
The P-2000 (see last paragraph about the P-2000/F).
It's not so much the absolute diameters that I was querying, but the way they say less than 10 and more than 5, which just seems a convoluted way of saying between 5-10, unless they mean something else altogether........?
Last edited by jsmaje on Wed Nov 08, 2006 2:14 pm, edited 1 time in total.

ZackG
Stardust@home Team
Stardust@home Team
Posts: 38
Joined: Thu Aug 17, 2006 4:25 pm

Post by ZackG »

Yeah, I think it is just a different model which pulls micropipettes to a different spec. The P-30 is advertised as down to 0.3 um http://www.sutter.com/products/product_sheets/p30.html. However, the CO2 laser version (I believe) makes more reproducible micropipettes which is important for some bio experiments. Although, maybe the bio guys just see the bigger pricetag, assume it must therefore be better, and hence they buy it. :wink: (I can make that jab only because I love bio!)
Zack Gainsforth
Space Sciences Laboratory
UC Berkeley

jsmaje
Posts: 616
Joined: Tue Aug 15, 2006 8:39 am
Location: Manchester UK

Post by jsmaje »

ZackG wrote:In this case, an ideal size would probably be a few microns for most purposes because the smaller the needle gets the harder it is to push liquid through it.
Sure, but in my case (with sub-micron bores) I was using electro-iontophoretic release. So, not so much a pushing (pressure) issue, but the electrical impedance involved.
Although, maybe the bio guys just see the bigger pricetag, assume it must therefore be better, and hence they buy it. :wink:
Naughty! But thanks for the subsequent comment, and especially for your very helpful postings and micrographs - we need more feedback like yours from the team in general.

Regards, John

greuti
Posts: 200
Joined: Fri Aug 11, 2006 10:11 am
Location: Switzerland

Post by greuti »

Just found an interesting image of the "blanking" process by glass needles: http://www.nasa.gov/mission_pages/stard ... eley2.html

From "NASA Spacecraft's Pinch of Comet Dust Reveals 'Cosmic Zoo' 12.14.06":
http://www.nasa.gov/mission_pages/stard ... index.html

ZackG
Stardust@home Team
Stardust@home Team
Posts: 38
Joined: Thu Aug 17, 2006 4:25 pm

Cool pictures

Post by ZackG »

Those pictures are sharp! Love them!
Zack Gainsforth
Space Sciences Laboratory
UC Berkeley

greuti
Posts: 200
Joined: Fri Aug 11, 2006 10:11 am
Location: Switzerland

Post by greuti »

Yeah, such full resolution pictures are great.

On the NASA/Ames multimedia site there're even more of the cutting equipment (from 12.08.):
http://www.nasa.gov/centers/ames/multim ... keley.html

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