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Some bacteria, such as Desulfovibrio, are able to reduce sulfates to hydrogen sulfide as the final step in the electron transport chain.
Ions
Atoms or molecules that have gained or lost one or more electrons, thus acquiring a charge.
Acid
A substance that is a hydrogen ion (proton) donor; acids unite with bases to form salts. Compare with base.
Atomic Mass
The mass of an atom expressed in atomic mass units (amu), essentially equivalent to the number of protons and neutrons in the nucleus.
Atom
The basic unit of a chemical element, consisting of a nucleus of protons and neutrons, with electrons orbiting the nucleus.
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