  We construct a prescriptive, bubble power-counting basis of one-loop
integrands suitable for representing amplitude integrands in
less-supersymmetric Yang-Mills theory. With the exception of massless bubbles,
all integrands have unambiguous, leading singularities as coefficients defined
in field theory; for the massless bubbles on external legs, we find two natural
choices which lead to different integrands that highlight distinct aspects of
field theory. For concreteness, we give the all-multiplicity integrands for MHV
amplitudes, and the split-helicity amplitude integrand for six-particle NMHV.
The basis we construct is mostly pure and is divided into to separately UV- and
IR-finite sectors of fixed transcendental weight, resulting in UV- and
IR-finite ratio functions of n-particle helicity amplitudes.
