Mercury accumulation by the fresh water alga

Filip, Daniel S.; Lynn, Raymond I.

doi:10.1016/0045-6535(72)90028-8

Cited by 10 publications

(5 citation statements)

References 1 publication

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“…Mercury, has also been found, to increase the cell volume of algae and cause cell deformities (Nuzzi, 1972;Davies, 1976). Algae accumulate mercury either by surface adsorption (Filip and Lynn, 1972;Fujita and Hashizume, 1972) or by active uptake (Fujita et ah, 1976), and the cell membrane is reported to be the primary site of mercury toxicity (Passow et al, 1961); Kamp-Nielsen, 1971). It has been reported 262 O. GOTSIS-SKRETAS that mercury interferes with photosynthetic pigments causing damage to them (DeFilippis and Pallaghy, 1976;Puckett, 1976).…”

Section: Introductionmentioning

confidence: 93%

Effects of mercury on cell population, chlorophyllaand rates of photosynthesis and excretion ofDunaliella minutalerche

Gotsis‐Skretas¹

1991

Toxicological & Environmental Chemistry

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The effects of mercury (HgCl 2 ) on cell population, chlorophyll a concentration and rates of photosynthesis and excretion were investigated in the phytoplanktonic species Dunaliella minuta in laboratory cultures. Mercury, above 25ppb inhibited both cell population and chlorophyll a concentration approximately to the same extent, whereas the photosynthetic rate was inhibited to a significantly lesser degree. Although, the total photosynthetic rate of the tested organism was reduced, above a threshold concentration, the photosynthetic activity was not reduced under these conditions, but it was in fact significantly greater than that in the control culture. This may suggest that in D. minuta the inhibitory effect of mercury is primarily on cell division rather than cellular photosynthesis, which is enhanced by the fact mercury caused a significant increase of the mean cell volume. Mercury, also, decreased the growth rate and final cell yield. The excretory rate was markedly increased at concentrations 250 ppb of mercury, but at lower concentrations it tended to depend more on the physiological state of cells than on mercury concentration. In the different cultures, the photosynthetic activity showed variations which occurred without major changes in the chlorophyll a content per cell, which remained almost constant and independent of variations in cell size and growth conditions.

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Section: Introductionmentioning

confidence: 93%

Effects of mercury on cell population, chlorophyllaand rates of photosynthesis and excretion ofDunaliella minutalerche

Gotsis‐Skretas¹

1991

Toxicological & Environmental Chemistry

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“…Some of the toxicity demonstrated in these studies may have been related to a slow uptake of Hg2e ions into the cell. Mercury is accumulated intracellularly by some algae (11,13,14), and, once within the cell, Hg2e could interact with numerous enzyme systems. Mercury can inhibit the transport of C compounds (8), the synthesis of pigments (8), the photosynthetic transfer of electrons (6, 7), and the activity of many enzymes (26,34).…”

Section: Discussionmentioning

confidence: 99%

“…A direct effect on the nitrogenase enzyme would require rapid uptake and transport of mercury intracellularly. However, the intracellular accumulation of mercury by some algae occurs slowly (11,13,14), and mercury is nonspecific in its toxicity towards enzyme systems (26). A reduction in the supply of ATP and reductant could relate to internal Hg2+ or to membrane damage.…”

Section: Figmentioning

confidence: 99%

“…Levels as low as 0.5 ppb reduce the growth of test species of green algae (24). Algae accumulate mercury either by surface adsorption (11,13) or by active uptake (14), and the cell membrane is reported to be the primary site of mercury toxicity (21,26). Photosynthesis is a very sensitive indication system for toxicity (8,16); mercury has been shown to interfere with photosynthetic electron transfer mechanisms (6, 7).…”

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confidence: 99%

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Effect of mercuric ion on the growth, photosynthesis, and nitrogenase activity of Anabaena inaequalis

Stratton¹,

Huber²,

Corke³

1979

Appl Environ Microbiol

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Anabaena inaequalis was sensitive to mercuric ion (Hg2+) in the ppb (nanogram per milliliter) range. Growth was inhibited significantly at concentrations of metal ion as low as 2 ppb, and 100 ppb was required to inhibit photosynthesis and acetylene reduction. Low levels of Hg2+ stimulated acetylene reduction and photosynthesis. The lysis of vegetative cells was the primary action of mercuric ions, resulting in the inhibition of growth, photosynthesis, and nitrogenase activity. There was a linear relationship between numbers of cells and the amount of

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“…Experimental evidence has indicated that the reduction of the initial treatment level through volatilization is a serious problem when.studying the effect of mercury compounds on algae (Ben-Bassat et al, 1972;Mayer, 1975, 1977; Knowles and Zingmark, 1975;Zingmark and Miller, 1975). Filip and Lynn (1972), Fujita and Hashizume (1975), and Glooschenko (1969) reported that adsorption of mercury compounds on the walls of glassware was a complicating factor in toxicity studies. Polycarbonate flasks have been used to reduce adsorption of mercury compounds in toxicity tests (Tompkins and Blinn, 1976).…”

Section: Hg(i1)mentioning

confidence: 99%

Growth responses of selected freshwater algae to trace elements and scrubber ash slurry generated by coal-fired power plants

et al. 1980

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Portions of this document may be illegible in electronic image products. Images are produced from the best available original document. NOTICE This report was prepared as an account of work sponsored by the United States Government. Neither the United States nor the United States Department of Energy, nor any of their employees, nor any of their contractors, subcontractors, or their employees, makes any warranty, express or implied, or assumes any legal liabili ty or responsibility for the accuracy, completeness, or usefulness of any information. apparatus, product or process disclosed, o r represents that its use would not infringe privately owned rights.

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Mercury accumulation by the fresh water alga

Cited by 10 publications

References 1 publication

Effects of mercury on cell population, chlorophyllaand rates of photosynthesis and excretion ofDunaliella minutalerche

Effects of mercury on cell population, chlorophyllaand rates of photosynthesis and excretion ofDunaliella minutalerche

Effect of mercuric ion on the growth, photosynthesis, and nitrogenase activity of Anabaena inaequalis

Growth responses of selected freshwater algae to trace elements and scrubber ash slurry generated by coal-fired power plants

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