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Tom Barr is Offline
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05-23-2007, 11:45 PM

Quote:
Originally Posted by aquabillpers View Post
Passing on bad karma is a great way to make things better.

A while back someone did that to Tom and since then he has had very little success in growing fresh water algae, no matter how hard he tries.

Bill

No, I can induce them when I see fit, and every so often when lazy, when I do not.
But it's the same old routine to get rid of them.
Over and over and over again.

FYI, plants can and do adapt to low CO2. They have far more Rubisco ready to snatch the low CO2. So when you scale up and add more CO2, they do well and there is no algae issues. After sometime passes, say 1-2 weeks, they reduce the Rubisco, they do not need much when you have 10X the CO2, so they downregulate that.


Now, reverse that senario. What happens when you go from a high CO2 situation, with a plant that have reduced the rubisco down a great deal, then reduce the CO2 supply suddenly?

Algae, poor growth, severe CO2 limitation. After 1-2 weeks, the plant can adapt.

But what happens if your CO2 gas injection ppm's are all over the place?
Bobbing between high and low levels?

The plants cannot adapt to both quickly, and they have lots of trouble, some grow okay and in spurts when there is enough cO2, but algae takes over fairly quick.

CO2 levels can change in minutes to about 1 hour, Rubisco levels take much longer to adapt assuming they have enough other resources, about 1 week or more in some cases.

When that occurs, the plant also reduces and downregulates NH4/PO4/NO3 uptake as well.

Regards,
Tom Barr
  
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