Lecture 13

May 12, 2008

Growth and Adaptation

1. Cell division in balanced growth

individual cell perspective

time to divide

2. Cell division cycle in diatoms

block at bi-nucleate cells

block before Si uptake

3. Acclimation through growth

optimized for average conditions

sim3

• importance of the least efficient component
• work forward with low light and up to max
• work backwards at max EnzBio
  • decrease photomemb
  • increases growth rate
• imagine fluctuation of input with a "buffer"

lead in to "regulation"

• if the purpose of regulation is to optimize (discuss below - 5)
• strategies sensitive to internal balance and ratios
• NADPH/NADP+ control over light
• NADPH/NADP+ and triose-P levels to control allocation
• algae/papers/3-models-metabolism/index.htm

4. acclimation to low light or nutrients

refering to Reynolds

minimum cell quota

models/lect13-minQ.xls

maintainence respiration

 

5. What if regulation isn't supposed to optimize growth?

mechanistic models for control

optimizing growth

survival

MAH