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Title: Surfactant-induced hydrogen production in cyanobacteria

Addition of Tween 85 to aqueous suspensions of Anabaena variabilis induced photosynthetic evolution of hydrogen over a time span of several weeks: as much as 148 nmol H[sub 2]/h [center dot] mg dry weight was produced in the first week by a suspension containing 4.2 mg dry weight of cells and 77 mM Tween 85. The chemical structure of Tween 85 was a necessary prerequisite for inducing hydrogen production, as compounds such as Tween 20, 60, and 80 had a quite different effect. There was a coupling between photosynthetic oxygen evolution and hydrogen evolution: Hydrogen evolution started to be effective only when oxygen evolution subdued. The presence of heterocysts in A. variabilis was also required for the Tween-induced hydrogen production. Based on these observations, possible mechanisms for the photosynthetic effect of Tween 85 are advanced and discussed.
Authors:
;  [1] ;  [2]
  1. (Inst. fuer Polymere, Zuerich (Switzerland))
  2. (Univ. di Bologna (Italy). Dept. di Biologia)
Publication Date:
OSTI Identifier:
6118802
Resource Type:
Journal Article
Resource Relation:
Journal Name: Biotechnology and Bioengineering; (United States); Journal Volume: 42:8
Country of Publication:
United States
Language:
English
Subject:
08 HYDROGEN; CYANOBACTERIA; PHOTOSYNTHESIS; HYDROGEN PRODUCTION; BIOSYNTHESIS; SURFACTANTS; CHEMICAL REACTIONS; MICROORGANISMS; PHOTOCHEMICAL REACTIONS; SYNTHESIS 080106* -- Hydrogen-- Production-- Biosynthesis & Photochemical Processes