Language: English Journal Announcement: EDB7611 Availability: Dep. NTIS $4.50. Subfile: INS (US Atomindex input); (Technical Information Center). ERA (Energy Research Abstracts); TIC Country of Origin: United States ‘ Country of Publication: United States Abstract: The present work is a combination of studies on natural radionuclides /sup 210/Po and /sup 210/Pb in aquatic environments and on the biogeochemistry of the transuranium elements /sup 239/Pu, /sup 240/Pu, and /sup 241/Am, in the Bikini Lagoon. The objectives of the biogeochemical studies are to evaluate the cycling of the radionuclides in the aquatic environment from their sources, within ecosystems, their uptake by biota, their distribution and their sinks. Detailed studies of the conditions which now exist some 17 years since the last nuclear detonations at Bikini should give a basis for predicting the effects of large-scale or low-level continuous releases of nuclear waste products in the marine environment. ; Major Descriptors: *AMERICIUM 241 -- RADIOECOLOGICAL CONCENTRATION; *BIKINI -- ENVIRONMENT; *BIKINI -- RADIATION MONITORING; *PLUTONIUM 239 -RADIOECOLOGICAL CONCENTRATION; *PLUTONIUM 240 -- RADIOECOLOGICAL CONCENTRATION Descriptors: AQUATIC ECOSYSTEMS; COASTAL WATERS; FALLOUT; LEAD 210; NATURAL RADIOACTIVITY; NUCLEAR EXPLOSIONS; POLONIUM 210; RADIONUCLIDE KINETICS; RADIONUCLIDE MIGRATION; SEAWATER; SEAWEEDS; SEDIMENTS; TIME DEPENDENCE Broader Terms: ACTINIDE ISOTOPES; ACTINIDE NUCLEI; ALPHA DECAY RADIOISOTOPES; AMERICIUM ISOTOPES; BETA DECAY RADIOISOTOPES; BETA-MINUS DECAY RADIOISOTOPES; DAYS LIVING RADIOISOTOPES; ECOLOGICAL CONCENTRATION; ECOSYSTEMS; ENVIRONMENTAL TRANSPORT; EVEN-EVEN NUCLEI; EVEN-ODD NUCLEI; EXPLOSIONS; HEAVY NUCLEI; HYDROGEN COMPOUNDS; ISLANDS; ISOTOPES; LEAD ISOTOPES; MARSHALL ISLANDS; MASS TRANSFER; MONITORING; NUCLEI; ODD-EVEN NUCLEI; OXYGEN COMPOUNDS; PLUTONIUM ISOTOPES; POLONIUM ISOTOPES; RADIOACTIVITY; RADIOISOTOPES; SURFACE WATERS; WATER; YEARS LIVING RADIOISOTOPES Subject Categories: 520300* -- Environment, Aquatic -- Radioactive Materials Monitoring & Transport -- (1989) 520302 -- Environment, Aquatic -- Radioactive Materials Monitoring & Transport -- Aquatic Ecosystems & Food Chains -- (-1987) INIS Subject Categories: B32* -- Water C22 -- Radionuclide Ecology 10/5/990 00149988 (Item 690 from file: 103) ERA-02-001547; EDB-76-088137 Author(s): Mague, Title: Nitrogen fixation on a coral reef T.H.; Holm-Hansen, O. Affiliation: Univ. of California, San Diego Source: Phycologia (United Kingdom) v 14:2. Publication Date: Jun 1975 Document Type: Journal Article p 87-92 Coden: PYCOA ~ Journal Announcement: EDB7610 Subfile: ERA (Energy Center). Country of Origin: Abstract: Benthic, Research Abstracts); TIC United States heterocystous blue-green algae Hormothamnion and Nostoc) acetylene at rapid rates. (Technical Information (genera Calothrix, from Eniwetok Atoll were found to reduce Slight acetylene reduction was associated with samples of Rhizoclonium (Chlorophyceae) and Oscillatoria (a cyanophyte lacking heterocysts), but this may have been due to contamination by epiphytes. There was virtually no acetylene reduction by phytoplankton, and nutrient enrichment experiments failed to selectively increase the numbers or activity of N/sub 2/-fixing algae in surface water samples. The Nostoc required light for acetylene reduction. Nitrogen fixation by this species could have supplied up to 11 ..mu..g N/cm/sup 2//day to the ecosystem. Major Descriptors: *ALGAE -- NITROGEN FIXATION; (auth); *NITROGEN FIXATION 9008085 Language: English