AnaerobiosisThe complete absence, or (loosely) the paucity, of gaseous or dissolved elemental oxygen in a given place or environment. (From Singleton & Sainsbury, Dictionary of Microbiology and Molecular Biology, 2d ed)
OxygenAn element with atomic symbol O, atomic number 8, and atomic weight 16. It is the most abundant element on earth and essential for respiration.
Molecular oxygen, O2, having two unpaired electrons in its most stable form.
MicrobiologyThe study of microorganisms such as fungi, bacteria, algae, archaea, and viruses.
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