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