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  • 1
    Electronic Resource
    Electronic Resource
    Production of free and organic iodine by Roseovarius spp. (2003)
    Oxford, UK : Blackwell Publishing Ltd
    FEMS microbiology letters 229 (2003), S. 0 
    Details
    ISSN: 1574-6968
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Biology
    Notes: Two strains of iodine-producing bacteria were isolated from marine samples. 16S rRNA gene sequences indicated the strains were most closely related to Roseovarius tolerans, and phylogenetic analysis indicated both belong to the same genus. 5 mM iodide inhibited the growth of strain 2S5-2 almost completely, and of strain S6V slightly. Both strains produced free iodine and organic iodine from iodide. CH2I2, CHI3 and CH2ClI were the main organic iodines produced by strain 2S5-2, and CHI3 and CH2I2 by strain S6V. Experiments using cells and spent media suggested that the organic iodines were produced from the compounds released or contained in the media and cells were necessary for the considerable production of CH2I2 and CH2ClI, though CHI3 was produced by spent media with H2O2 or free iodine.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1016/S0378-1097(03)00839-5
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  • 2
    Electronic Resource
    Electronic Resource
    Pressure-induced alteration in fatty acid composition of barotolerant deep-sea bacterium (1992)
    Springer
    Journal of oceanography 48 (1992), S. 93-104 
    Details
    ISSN: 1573-868X
    Source: Springer Online Journal Archives 1860-2000
    Topics: Geosciences
    Notes: Abstract Barotolerant bacterium was isolated from sediment sample which was obtained from the depth of 4033 m in the Izu-Ogasawara Trench. The physiological property, growth characteristics and fatty acid composition were examined. The strain was a psychrotrophic and barotolerant bacterium, and was identified as species in the genusAlteromonas. The fatty acids of the strain were from C12 to C18. As the growth pressure increased, the portion of unsaturated fatty acid in membrane fraction increased due to an increase in the portion of C17∶1 and C18∶1, while the relative portion of C16∶0 and C16∶1 decreased. On the other hand, as the growth temperature decreased, the portion of unsaturated fatty acid increased due to the increase in the portion of C16∶1 and C18∶1.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02234034
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  • 3
    Electronic Resource
    Electronic Resource
    Effects of various elements on arsenic accumulation of the alga Dunaliella salina (1994)
    New York, NY [u.a.] : Wiley-Blackwell
    Applied Organometallic Chemistry 8 (1994), S. 229-235 
    Details
    ISSN: 0268-2605
    Keywords: Arsenic ; Dunaliella salina ; microalgae ; elements ; accumulation ; Chemistry ; Organic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: The effect of 23 various elements (nitrogen, manganese, magnesium, molybdenum, zinc, selenium, gallium, nickel, cobalt, lithium, strontium, vanadium, tin, antimony, bismuth, cadmium, chromium, lead, iron, silver, copper, potassium and calcium) in water on growth and arsenic accumulation in Dunaliella saline was investigated. The order of growth inhibition of D. salina by these elements was Ag〉Cd〉Co〉Ni〉Cu〉Zn〉Fe〉Sb〉Ga〉Cr〉Bi〉Sr〉Mn〉Sn〉Se〉Pb〉V〉Ca, Mg, Mo, K, Li.Arsenic accumulation in D. salina was unaffected by an increase in calcium and chromium. Also, the arsenic content in D. salina decreased at a potassium concentration of 100 mg dm-3, and was also reduced by the addition of cadmium and nitrogen; however, it was increased by the addition of lithium at 100 mg dm-3, tin, gallium, bismuth, strontium, vanadium, iron and manganese at 10 mg md-3, lead, antimony, zinc, copper cobalt and nickel at 1 mg dm-3, selenium at 0.1 mg dm-3, and silver at 0.005 mg dm-3, respectively. These results imply that arsenic accumulation by D. salina depends upon biological activity and physical adsorption.
    Additional Material: 1 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/aoc.590080312
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  • 4
    Electronic Resource
    Electronic Resource
    Effect of metal ions on accumulation of arsenic in marine green algae, Dunaliella sp. (1990)
    New York, NY [u.a.] : Wiley-Blackwell
    Applied Organometallic Chemistry 4 (1990), S. 265-268 
    Details
    ISSN: 0268-2605
    Keywords: Accumulation ; arsenic ; Dunaliella sp. ; metal ions ; Chemistry ; Organic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: To investigate the effect of metal ions such as cobalt(II), copper(II), molybdenum(VI) and manganese(II) on the accumulation of arsenic in Dunaliella sp., the amount of arsenic accumulated in these algae was determined under coexistence of arsenic and the other metals by the hydridegeneration atomic absorption spectrometry method. Survival of Dunaliella sp. was inhibited by the addition of copper and cobalt in a solution containing arsenic. Copper and cobalt in the medium also inhibited the accumulation of arsenic in Dunaliella sp., and the amount of arsenic in the algae decreased with increase in the concentration of copper and cobalt. On the other hand, the amount of arsenic accumulated in Dunaliella sp. was found to be unaffected by manganese and molybdenum in the solution.
    Additional Material: 6 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/aoc.590040315
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  • 5
    Electronic Resource
    Electronic Resource
    Effects of arsenic on the organic component of the alga Dunaliella salina (1992)
    New York, NY [u.a.] : Wiley-Blackwell
    Applied Organometallic Chemistry 6 (1992), S. 357-362 
    Details
    ISSN: 0268-2605
    Keywords: Arsenic ; β-carotene ; carbohydrate ; Dunaliella salina ; microalgae ; Chemistry ; Organic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: The unicellular marine alga, Dunaliella salina 19/30 was grown in seawater containing an inorganic arsenic concentration (Na2HAsO4) up to 2000 mg dm-3. The cells survived even at 5000 mg dm-3. The arsenic concentration of the cells increased with an increase of the surrounding arsenic concentration. Arsenic in D. salina was also greatly affected by addition of phosphorus. The arsenic-tolerance behavior of D. salina seemed to suggest that the algae have a function to prevent accumulation of inorganic arsenic by increasing the β-carotene, fatty-acid (C18:1, C18:3) and water-extractable carbohydrate content in the cells. Arsenic accumulation also rose steadily with an increase in the nitrogen concentration in the medium.
    Additional Material: 3 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/aoc.590060408
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  • 6
    Electronic Resource
    Electronic Resource
    Effect of cadmium on the accumulation of arsenic in a marine green alga, Dunaliellasp. (1992)
    New York, NY [u.a.] : Wiley-Blackwell
    Applied Organometallic Chemistry 6 (1992), S. 363-367 
    Details
    ISSN: 0268-2605
    Keywords: Marine green alga ; Dunaliellasp. ; arsenic ; cadmium ; accumulation ; growth inhibition ; water-soluble fraction ; Chemistry ; Organic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: To investigate the effect of cadmium on the accumulation of arsenic by Dunaliella sp., the arsenic accumulated in the alga was determined as a function of time for coexistence of the algae with arsenic and cadmium, with batch methodology. Growth of Dunaliella sp. was affected by addition of arsenic (Na2HAsO4.7H2O) and cadmium (CdCl.2.5H2O). Growth inhibition of Dunaliella sp. was accelerated by coexistence of arsenic and cadmium. The content of arsenic in Dunaliella sp. became a maximum at 15 h after exposure. The arsenic content in the cells was influenced by addition of cadmium to the solution; the arsenic content in the alga derived from growth in a 10 mg As dm -3 solution decreased from 2.7 mg g-1 in the absence of cadmium to 0.35 mg g-1 for the addition of 100 mg Cd dm-3. Dunaliella sp. accumulated cadmium in large quantities but, in conditions of coexistence with arsenic and cadmium, the cadmium content in cells decreased with an increase in the concentration of arsenic in the growth medium Cadmium accumulation by Dunaliella sp. was observed in dead cells although arsenic accumulation was not observed. About 85% of arsenic in the cells was in the water-soluble fraction. On the other hand, about 42% of cadmium in the cells was in the water-soluble fraction, and about 55% was in a fraction soluble in cold trichloroacetic acid.
    Additional Material: 4 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/aoc.590060409
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  • 7
    Electronic Resource
    Electronic Resource
    Accumulation of arsenic and selenium by Dunaliella sp. (1990)
    New York, NY [u.a.] : Wiley-Blackwell
    Applied Organometallic Chemistry 4 (1990), S. 261-264 
    Details
    ISSN: 0268-2605
    Keywords: Arsenic ; selenium ; bioaccumulation ; Dunaliella sp. ; microalgae ; Chemistry ; Organic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: The unicellular marine alga, Dunaliella sp., was grown in seawater containing selenium and arsenic. Dunaliella sp. readily took up selenite from the medium over a broad range of concentrations (10-10-10-5mol dm-3). In comparison, uptake from selenate was generally minimal. Selenite was detectable in cells within 24 h and concentrations increased gradually with time. Also iron and zinc concentrations in Dunaliella sp. cells were largely affected by addition of arsenic and gallium. Arsenic concentrations in cultures were largely correlated to the accumulation of arsenic by Dunaliella sp., but did not affect the accumulation of selenium by Dunaliella sp. This implied that the accumulation process of selenium was different from that of arsenic.
    Additional Material: 3 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/aoc.590040314
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  • 8
    Electronic Resource
    Electronic Resource
    Environmental factors relating to arsenic accumulation by Dunaliella sp (1988)
    New York, NY [u.a.] : Wiley-Blackwell
    Applied Organometallic Chemistry 2 (1988), S. 359-364 
    Details
    ISSN: 0268-2605
    Keywords: arsenic ; microalgae ; bioaccumulation ; environmental factors ; Chemistry ; Organic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: The accumulation of arsenic by Dunaliella sp. was examined by using a solution containing arsenic only as a first approach to the study of arsenic recovery by aqueous systems. The accumulation of arsenic by Dunaliella sp. was rapid, with equilibrium established in 8 h with respect to arsenic partioning between dissolved and particulate phase. The optimum accumulation was at pH 8.2, NaCl 20 g dm-3, illumination 5000-10000 lux and temperature 22°C. Increased phosphate concentration significantly decreased the uptake of arsenic in the culture. These results suggested that accumulation of arsenic by Dunaliella sp. depended upon biological activity.
    Additional Material: 7 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/aoc.590020413
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  • 9
    Electronic Resource
    Electronic Resource
    Uptake and Reduction of Arsenate by Dunaliella sp. (1996)
    New York, NY [u.a.] : Wiley-Blackwell
    Applied Organometallic Chemistry 10 (1996), S. 753-756 
    Details
    ISSN: 0268-2605
    Keywords: Dunaliella sp ; arsenate ; arsenite ; reduction ; water-soluble fraction ; gel filtration ; Chemistry ; Industrial Chemistry and Chemical Engineering
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: Uptake and reduction of arsenate [AS(V)] by Dunaliella sp. cells were determined to investigate the metabolic processes of arsenic in the alga. Cellular uptake of arsenic by Dunaliella sp. cells was markedly affected by the form of arsenic in the medium. The content of arsenic taken up by Dunaliella sp. cells increased rapidly with time on addition of As(V) to the medium. However, in the case of addition of arsenite [As(III)], the gradient of arsenic uptake by Dunaliella sp. cells was low, and arsenic content was small. In the water-soluble fraction of arsenic taken up by Dunaliella sp. cells with exposure to As(V), arsenic was in the forms of organic arsenic, As(V) and As(III). The content of As(V) in the water-soluble fraction increased with exposure time. The content of As(III) also increased with time, but remained constant after 5 h of exposure. On the other hand, organic arsenic content was small and did not increase with time. It was found that Dunaliella sp. takes up As(V) and readily reduces it to As(III)
    Additional Material: 3 Ill.
    Type of Medium: Electronic Resource
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  • 10
    Electronic Resource
    Electronic Resource
    Accumulation of Arsenic by Rhaphydophyceae Chattonella antiqua (Hada) Ono (1996)
    New York, NY [u.a.] : Wiley-Blackwell
    Applied Organometallic Chemistry 10 (1996), S. 721-726 
    Details
    ISSN: 0268-2605
    Keywords: arsenic ; accumulation ; Chattonella antiqua ; microalgae ; Chemistry ; Industrial Chemistry and Chemical Engineering
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: Rhaphydophyceae Chattonella antiqua (Hada) Ono was grown in seawater containing an arsenic concentration up to 50 mg dm-3, and survived even at 200 mg dm-3. The arsenic content increased with an increase of the surrounding arsenic, iron and manganese concentrations. However, arsenic accumulation was unaffected by phosphorus concentration. Also, arsenic content in C. antiqua decreased at a selenium concentration of up 20 mg dm-3, and was reduced by the addition of antimony. In the living cells, about 52% of the arsenic which accumulated in each cell was found in the intracellular fraction, 27% in the lipid fraction, and 21% in the cell wall fraction.
    Additional Material: 1 Ill.
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