a rod-shaped bacterium

the voltage that is produced in a circuit because of a changing current

the nuclear radiation that arises naturally from cosmic rays and from radioactive isotopes in the soil and air

in a modern taxonomic system, a domain made up of prokaryotes that usually have a cell wall and that usually reproduce by cell division; this domain aligns with the traditional kingdom Eubacteria

extremely small, single-celled organisms that usually have a cell wall and that usually reproduce by cell division (singular, bacterium)

a virus that infects bacteria

the horny plates that hang from the mouth of some whales; used to filter out water but to retain solids when whales feed

a joint in which the head of one bone is inserted into a hollow in another bone; examples include the hip and the shoulder

the minimum energy separation between the highest occupied state and the lowest empty state

a branch of a vane in the feather of a bird