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Immobilied blue-green algae in sheet form

  • US 4,950,601 A
  • Filed: 03/17/1987
  • Issued: 08/21/1990
  • Est. Priority Date: 03/17/1987
  • Status: Expired due to Term
First Claim
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1. A nutrient-producing structure in the form of a sheet, which structure comprises a composite consisting essentially of a substantially water-insoluble support having a surface energy of from about 30 dynes per cm to about 115 dynes per cm to which nitrogen-fixing filamentous blue-green algal heterocyst cells are attached, said support being particulate or fibrous and substantially free of substances which have a significant deleterious effect on the viability of the attached algae, which attached algal heterocyst cells, when allowed to grow in a nitrogen-deficient environment, fix nitrogen at a rate which is substantially greater than that of such cells not so attached.

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