  We present BIMA and IRAM CO(1--0) observations of seven low surface
brightness (LSB) galaxies, including three large spirals with faint disks but
prominent bulges, and four relatively small LSB galaxies with irregular disks.
The giant LSB galaxies are UGC 5709, UGC 6614 and F568-6 (Malin2). The smaller
LSB galaxies are NGC 5585, UGC 4115, UGC 5209 and F583-1. The galaxies were
selected based on their relatively high metallicity and apparent signs of star
formation in their disks. The BIMA maps suggested the presence of molecular gas
in 2 of the giant LSB galaxies, F568-6 and UGC 6614. Using the 30m IRAM
telescope we detected CO (1--0) emission in the disks of both galaxies and in
the nucleus of F568-6. The molecular gas in these galaxies is clearly offset
from the nucleus and definitely associated with the LSB disk. In addition we
also detected a millimeter continuum source in the center of UGC 6614. When
compared with VLA 1.5 GHz observations of the galaxy, the emission was found to
have a flat spectrum indicating that the millimeter continuum emission is most
likely due to an active galactic nucleus (AGN) in the galaxy. Our results show
that giant LSB spirals may contain significant quantities of molecular gas in
their disks and also harbor radio bright AGN in their centers.
