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<UL><B>Growth conditions:</B>
<UL>
<LI>
Axenic <I>Lemna gibba</I> in <A HREF="../media.htm#COWGILL" TARGET="_top">E-medium
+ 1% sucrose</A>,</LI>
<LI>
temperature 25 C,</LI>
<LI>
continuous light 40-55 <NOBR>µEinstein•m<SUP>-2</SUP>•sec<SUP>-2</SUP></NOBR>
from four fluorescent tubes, 2xF40cw and 2xF40Gro.</LI>
</UL>
<B>Definitions:</B>
<P><I>Photosynthetically active radiation</I> (PAR) is generally measured
in units of µEinsteins. A µEinstein of light is Avogadro's
number <NOBR>(6.02 x 10<SUP>23 </SUP>= 1 mole)</NOBR> of photons.
Full sunlight is approximately 2000 <NOBR>µEinsteins•m<SUP>-2</SUP>•sec<SUP>-2</SUP></NOBR>.
The intensity of PAR in this experiment, 50 <NOBR>µEinsteins•m<SUP>-2</SUP>•sec<SUP>-2</SUP></NOBR>,
is near the <A HREF="http://www.actwin.com/fish/aquatic-plants/month.9603/msg00528.html" TARGET="_top">compensation
point</A> for photosynthesis, the light intensity for which photosynthesis
just balances respiration. For that reason, axenic culture using
sucrose was necessary to obtain good growth.
<BR>
<LI>
For more information about <B>photosynthesis</B>, see <NOBR>[ <A HREF="http://www.life.uiuc.edu/bio100/lectures/s97lects/07Photosynthesis/photosynsumm.html" TARGET="_top">this
summary</A> ]</NOBR> from a course at the University of Illinois, Urbana/Champaign.
The same group also recommend these [ <A HREF="http://www.life.uiuc.edu/bio100/Link_page/photosyn.htm" TARGET="_top">links</A>
].</LI>
</UL>
<HR><A NAME="pgbot"></A><FONT SIZE=-2>Copyright (c) 1999 John W. Cross</FONT>
<BR><FONT SIZE=-2>Published by Lotus® Freelance Graphics®</FONT>
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