side-chain

This work and his other immunological studies led Ehrlich to formulate his famous side-chain theory of immunity.

Paul Ehrlich - Biography 1967

OURTHYROID 53 present in food, adds them to the tyrosine molecule, doubles the side-chain, and adds more iodine to form thyroxine.

The Human Brain Asimov, Isaac 1963

From each amino acid unit in the chain a side-chain sticks out, and it is the unique pattern of side-chains that makes each type of protein molecule different from all others.

The Human Brain Asimov, Isaac 1963

Aspartic acid (because it resembles asparagine; although aspartic acid possesses an acid group, COOH, in the side-chain and asparagine possesses a similar group, CONHz, with no acid properties),

The Human Brain Asimov, Isaac 1963

The steroids in digitalis are something like the bile acids in structure except that the carboxyl group on the side-chain combines with another portion of the chain to form a fifth ring that is not part of the four-ring steroid nucleus.

The Human Brain Asimov, Isaac 1963

Methionine (because the side-chain contains an atom grouping called the "methyl group," which is in turn attached to a sulfur atom, called theion in Greek),

The Human Brain Asimov, Isaac 1963

In addition, attached to the central carbon is an H, which simply represents a hydrogen atom, and an R, which represents a side-chain.

The Human Brain Asimov, Isaac 1963

Praline (a shortened version of "pyrrolidine," which is the name given to the particular atom arrangement in proline's side-chain),

The Human Brain Asimov, Isaac 1963

The side-chain attached to one of these central carbon atoms runs into and coalesces with the side-chain attached to the other.

The Human Brain Asimov, Isaac 1963

It is this R, or side-chain, that is different in each amino acid.

The Human Brain Asimov, Isaac 1963