Editing Obligate aerobe (section)

== Survival strategies ==
When obligate aerobes are in a temporarily oxygen-deprived environment, they need survival strategies to avoid death.<ref name=":2">{{Cite journal|last1=Berney|first1=Michael|last2=Greening|first2=Chris|last3=Conrad|first3=Ralf|last4=Jacobs|first4=William R.|last5=Cook|first5=Gregory M.|date=2014-08-05|title=An obligately aerobic spirillum fermentative hydrogen production to survive reductive stress during hypoxia|journal=Proceedings of the National Academy of Sciences of the United States of America|volume=111|issue=31|pages=11479–11484|doi=10.1073/pnas.1407034111|issn=0027-8424|pmc=4128101|pmid=25049411|bibcode=2014PNAS..11111479B|doi-access=free}}</ref> Under these conditions, ''[[Mycobacterium smegmatis]]'' can quickly switch between [[fermentative hydrogen production]] and hydrogen oxidation with either oxygen or [[fumarate]] reduction depending on the availability of [[electron acceptor]].<ref name=":2" /> This example is the first time that [[hydrogen production]] has been seen in an obligate aerobe.<ref name=":2" /> It also confirms the [[fermentation]] in a [[mycobacterium]] and is evidence that hydrogen plays a role in survival as well as growth.<ref name=":2" />

Problems can also arise in oxygen-rich environments, most commonly attributed to [[oxidative stress]]. This occurrence is when there is an imbalance of [[free radicals]] and [[Antioxidant|antioxidants]] in the cells of the organism, largely due to [[pollution]] and [[radiation]] in the environment. Obligate aerobes survive this [[phenomenon]] by using the organism's [[immune system]] to correct the imbalance.<ref>{{Cite web|date=2019-04-03|title=What is oxidative stress? Effects on the body and how to reduce|url=https://www.medicalnewstoday.com/articles/324863|access-date=2021-05-08|website=www.medicalnewstoday.com|language=en}}</ref>