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Table 1  M. stadtmanae  16S rDNA gene copy number after 48-hour culture with Na 2 O 4 W + Na 2 O 4 Se or only Na 2 O 4 W and a 6-day culture with no Na 2 O 4 W + Na 2 O 4 Se or only with Na 2 O 4 Se (Mean and standard deviation were calculated for 10 independent culture tests for each condition)

From: Tungsten-enhanced growth of Methanosphaera stadtmanae

  48-hour culture 6-day culture
  without with with with without
  Na2O4W + Na2O4Se Na2O4W + Na2O4Se Na2O4W Na2O4Se Na2O4W + Na2O4Se
Means 2.13E + 10 4.42E + 12 3.93E + 12 4.02E + 12 3.22E + 12
Standard deviation 5.56E + 09 1.84E + 11 3.67E + 11 2.23E + 11 1.53E + 11