Re: Hatching Nothobranchius and etc.

[Wright Huntley <jwwiii at pacbell_net>]

Rjga at aol_com wrote:
> In a message dated 4/23/03 3:20:16 PM Eastern Daylight Time, 
> dskatz at optonline_net writes:
>
>
>
> > As long as the cap of the vial is not tight, the eggs in the vial will be
> > under the same pressure as will the water surrounding the eggs.
> > Dan
>
>
> One more point. It takes about 30 feet of water to increase gas pressure one 
> atmosphere, and divers usually rest at about 15 feet to equalize during this 
> most important (largest) decompression. A two foot deep aquarium would not 
> provide much pressure, even if there were gases to compress.  


Pressure and compressibility are unrelated parameters (except that 
compressibility is one kind of response to pressure -- but not the only 
one). The vial equalized at the bottom of the 55G tank will have about 1 
psi more pressure than it did at the surface (15.7 vs 14.7), and that 
pressure will be on all surfaces, including the egg's. To the extent that 
dissolved gas or ion transport are pressure dependent, there could be 
significant effects.

If the egg does not compress at all, there will be no tendency for 
*liquid* flow through the membranes of the chorion to equalize internal 
pressure. The internal pressure will just go up about 1 psi. That does not 
mean that other transport might not be enhanced or inhibited by the 
different pressure.

Wright

--
Wright Huntley -- 209 521-0557 -- 731 Loletta Ave, Modesto CA 95351

When you are in mortal danger, you are supposed to dial 911, so that
the police can arrive on the scene some time later, identify your body,
and file reports in triplicate.  -- Thomas Sowell 4/21/03

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