  We report measurements of the temperature and gate voltage dependence for
individual bundles (ropes) of single-walled nanotubes. When the conductance is
less than about e^2/h at room temperature, it is found to decrease as an
approximate power law of temperature down to the region where Coulomb blockade
sets in. The power-law exponents are consistent with those expected for
electron tunneling into a Luttinger liquid. When the conductance is greater
than e^2/h at room temperature, it changes much more slowly at high
temperatures, but eventually develops very large fluctuations as a function of
gate voltage when sufficiently cold. We discuss the interpretation of these
results in terms of transport through a Luttinger liquid.
