Cadmium transport by Chlorella pyrenoidosa. [/sup 109/Cd, /sup 54/Mn]

Journal Article · Sun Apr 01 04:00:00 EST 1979 · Environ. Res.; (United States)

OSTI ID:5413800

Hart, B A; Bertram, P E; Scaife, B D

Chlorella pyrenoidosa, incubated at 31/sup 0/C in a medium containing CdCl/sub 2/ concentrations ranging from 0.025 to 0.500 ..mu..g/ml, incorporated cadmium in a linear fashion for 60 min. The rate of uptake was dependent upon the exogenous cadmium concentration; 2.98 ..mu..M CdCl/sub 2/ was required to half-saturate the transport system. Cd uptake is reduced by lower temperatures and when cultures are not illuminated. Both manganese and iron inhibited cadmium uptake but zinc and cobalt had no effect. The inhibition of cadmium uptake by manganese could be correlated with the concentration of manganese present; kinetic studies showed manganese to be a competitive inhibitor. Similar kinetic studies revealed that Mn transport is competitively inhibited by cadmium. The ability of C. pyrenoidosa to incorporate cadmium and manganese is determined, in large part, by the composition of the growth medium. Cells, grown in a medium containing low levels of Mn, incorporate both Cd and Mn at a faster rate than cells grown in a medium containing high levels of Mn. The rate of Cd and Mn incorporation is also faster in cells that have been previously exposed to Cd. The data support the conclusion that manganese and cadmium share a common transport system in C. pyrenoidosa.

• Research Organization: Univ. of Vermont, Burlington
• OSTI ID: 5413800
• Journal Information: Environ. Res.; (United States), Journal Name: Environ. Res.; (United States) Vol. 18:2; ISSN ENVRA
• Country of Publication: United States
• Language: English

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59 BASIC BIOLOGICAL SCIENCES
63 RADIATION, THERMAL, AND OTHER ENVIRON. POLLUTANT EFFECTS ON LIVING ORGS. AND BIOL. MAT.
ALGAE
BETA DECAY RADIOISOTOPES
BIOCHEMICAL REACTION KINETICS
BIOLOGICAL EFFECTS
CADMIUM
CADMIUM 109
CADMIUM ISOTOPES
CELL CULTURES
CHLORELLA
COBALT
DATA
DATA FORMS
DAYS LIVING RADIOISOTOPES
ELECTRON CAPTURE RADIOISOTOPES
ELEMENTS
EVEN-ODD NUCLEI
EXPERIMENTAL DATA
INFORMATION
INTERMEDIATE MASS NUCLEI
IRON
ISOLATED VALUES
ISOTOPE APPLICATIONS
ISOTOPES
KINETICS
MANGANESE
MANGANESE 54
MANGANESE ISOTOPES
METABOLISM
METALS
MICROORGANISMS
NUCLEI
NUMERICAL DATA
ODD-ODD NUCLEI
PLANTS
QUANTITY RATIO
RADIOISOTOPES
RADIONUCLIDE KINETICS
REACTION KINETICS
RESPONSE MODIFYING FACTORS
TEMPERATURE EFFECTS
TRACER TECHNIQUES
TRANSITION ELEMENTS
UNICELLULAR ALGAE
UPTAKE
YEARS LIVING RADIOISOTOPES
ZINC