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Comparison between prokaryotic heterotrophic carbon production determined by parallel incorporation experiments of 3H-thymidine or 3H-leucine carried out on diluted sediments (1:1) and intact sediment cores collected at the two benthic deep-sea sites (at 450 and 1900 m water depth). Mean values (n = 3) and SDs are reported. The upper case letter “A” for the station at 1900 m indicates values significantly higher (p < 0.01) than at 450 m water depth (marked with lower case letter “a”).
