| http://www.w3.org/ns/prov#value | - The reaction time is the elapsed time between initiation and termination of oxygen flow. (Although, for brevity, the description herein repeatedly refers to ???oxygen??? or ???oxygen flow???, it will be understood that any oxygen containing gas, including air, can be used as the oxygen source.) In some embodiments, the reaction time is 110 to 300 minutes, specifically 140 to 250 minutes, more spec
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