Organic carbon and humic substances contents, carbon isotope composition and peroxidase activity in sediments from DSDP Sites 15-147 and 75-532, supplement to: Nissenbaum, Arie; Serban, Andrei (1987): Enzymatic (?) activity-associated with humic substances in deep sediments from the Cariaco Trench and Walvis Ridge. Geochimica et Cosmochimica Acta, 51(2), 373-378

Arie Nissenbaum & Andrei Serban
Sediment samples from the Cariaco Trench (DSDP Leg 15) and the Walvis Ridge (DSDP Leg 75) ranging in age from Holocene to Upper Miocene (approximately 8 million years BP) and in depth from 5 to 258 m were extracted with basic sodium pyrophosphate and the extract analyzed for enzymic activity. Since no dehydrogenase, alkaline phosphatase or esterase activity was found, it is estimated from these data that the maximum bacterial population does not exceed 1000...
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