BioBoard/Documentation/Oxygen: Difference between revisions
(Created page with '=Introduction to oxygen= =Building a dissolved oxygen probe= ==How an optode works== ===What you need=== ===How to build it=== ===Things to keep in mind=== =Interfacing and…') |
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=Introduction to oxygen= | =Introduction to dissolved oxygen= | ||
Why is oxygen important? For us humans, if we have oxygen, we survive...yay! If not, we don't...boo. So, superficially, this may not seem like a very important parameter to know - you either have oxygen, or you don't. However, for many microorganisms, there are a lot of shades of gray. | |||
For a bacteria or a yeast, different amounts of oxygen produce different results. For instance, starving a yeast cell of oxygen produces ethanol as a metabolite product instead of carbon dioxide. Starving a lake of oxygen not only prevents fishies from living in it, but also promotes the formation of large algae surfaces. Cool, right? | |||
The biggest problem with measuring dissolved oxygen currently is the cost of the equipment available to do it. Typically, dissolved oxygen probes run well into the $400+ range, thus placing them well out of the realm of hobbyists. The cost is not wholly unwarranted - dissolved oxygen meters used a platinum catalyzed reaction with very specific membranes to measure oxygen response. By cutting out the platinum catalyst and the specialized membrane, the cost of a DO meter could drop considerably...enter the optode! | |||
=Building a dissolved oxygen probe= | =Building a dissolved oxygen probe= |
Revision as of 19:49, 2 May 2011
Introduction to dissolved oxygen
Why is oxygen important? For us humans, if we have oxygen, we survive...yay! If not, we don't...boo. So, superficially, this may not seem like a very important parameter to know - you either have oxygen, or you don't. However, for many microorganisms, there are a lot of shades of gray.
For a bacteria or a yeast, different amounts of oxygen produce different results. For instance, starving a yeast cell of oxygen produces ethanol as a metabolite product instead of carbon dioxide. Starving a lake of oxygen not only prevents fishies from living in it, but also promotes the formation of large algae surfaces. Cool, right?
The biggest problem with measuring dissolved oxygen currently is the cost of the equipment available to do it. Typically, dissolved oxygen probes run well into the $400+ range, thus placing them well out of the realm of hobbyists. The cost is not wholly unwarranted - dissolved oxygen meters used a platinum catalyzed reaction with very specific membranes to measure oxygen response. By cutting out the platinum catalyst and the specialized membrane, the cost of a DO meter could drop considerably...enter the optode!