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 Alfred explains Wächtershäuser's theory on the origin of life |
 Sampling a portion of microbial mat from Elkhorn Slough |
 Conspicuous veils of colorless sulfur bacteria appear in the mats |
 Microbial mats in the lab |
 Extracting DNA and performing PCR for analysis of Vibrio population genetics |
 View from Hopkins Marine Station to Monterey Bay Aquarium |
 Spirochetes observed under the microscope from Elkhorn Slough samples |
 Beggiatoa observed using dark-field microscopy |
 The cyanobacterium Oscillatoria and others |
 Sampling from tide pools at Hopkins Marine Station |