Abstract:
: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(2)/h . 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.
journal_name
Biotechnol Bioengjournal_title
Biotechnology and bioengineeringauthors
Famiglietti M,Hochkoeppler A,Luisi PLdoi
10.1002/bit.260420812subject
Has Abstractpub_date
1993-10-01 00:00:00pages
1014-8issue
8eissn
0006-3592issn
1097-0290journal_volume
42pub_type
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