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Re: pearling

An excelent lecture regarding substrates and other goodies is at


cut from the lecture....

Art Giacosa, July 6, 1997

So where does the O2 come from. Well, a by product of photosynthesis is
O2. We generally think that the plants give off all of the O2 they produce
the surrounding water column. However, this is not the case. Since in nature
O2 is in short supply, plants have learned to save some of the O2 they produce
for themselves. The O2 is sent by the plant to parts of the plant where growth
is occurring, some is saved for respiration and some is sent down to the roots
where it is released into the surrounding substrate. This movement of O2 can
be seen. Many of you may have been delighted by tiny chains of bubbles
rising from your plants. These tiny chains of bubbles is O2 escaping from the
plants from a small wound.[18] It is O2 the plant wanted to keep within
but unfortunately lost to the environment.

It has been determined that these tiny chains are composed of about 90% O2.
Agnes Arber,
Water Plants, Cambridge University Press, 1920, pg. 256 at footnote 2.

Darin Simmons
Santa Barbara, Ca
original post
Date: Sun, 18 Apr 1999 05:28:31 -0600
From: ruddigar at home_com
Subject: pearling

While we're on the subject of saturated gasses, I was wondering if
pearling means that the water is saturated with oxygen - i.e. no more
oxygen can dissolve into the water?  Or is it like adding CO2 - the
bubbles dissolve while in the water?

Just curious.

Jason Miller
Sherwood Park, AB