| diversity of assimilatory nitrate reductase genes from plankton and epiphytes associated with a seagrass bed. | assimilatory nitrate reductase gene fragments were isolated from epiphytes and plankton associated with seagrass blades collected from tampa bay, florida, usa. nitrate reductase genes from diatoms (nr) and heterotrophic bacteria (nasa) were amplified by polymerase chain reaction (pcr) using two sets of degenerate primers. a total of 129 nr and 75 nasa clones from four clone libraries, two from each of epiphytic and planktonic components, were sequenced and aligned. in addition, genomic dna seque ... | 2007 | 17851710 |