Scenedesmus algae

Bacteria- Escherichia coli Creen algae-Scenedesmus quadricauda Daphnia magna Protozoa microregma... 

Eukaryotic algae (Chlorophyceae) of the genera Chforella and Scenedesmus have been used for SCP production. Several types of cultivation systems have been considered, depending on the substrate used and whether the SCP is intended for use as food or feed. 

Green alga Scenedesmus subspicatus) MMTC 72-h EC50 (growth rate) 0.03 0.03 Oidersma et ai. (2003a)... 

Green alga Scenedesmus subspicatus) DBTO 72-h ECso (growth rate) >saturated solution ( 1.6 mg/l) >saturated solution ( 2 mg/l) Schering AG (1999b)... 

Green alga (Scenedesmus subspicatus) DBTM 72-h ECso (growth rate) 4.1 3.6 Oldersma et al. (2003c)... 

Green alga Scenedesmus subspicatus) DOT(EHMA) 72-h EC50 (growrth rate) >solubility (-0.07 mg/l) >solubility (-0.07 mg/l) Ciba-Geigy Ltd (1988c)... 

Monomethyltirf. Acute toxicity studies were identified for monomethyltin for algae, invertebrates, and fish. Chronic NOECs were available for algae and invertebrates. A chronic NOEC of 0.007 mg/1 for monomethyltin chloride in Scenedesmus subspica-tus was the lowest reported result. Since there were no long-term test results available for fish, it was necessary to apply an uncertainty factor of 50 to the critical study. 

Oldersma H, HanstveitAO, de Wolf JM (2003a) Trichloromethyl-stannane (CASRN 993-16-8) Determination of the effect on the growth of the fresh water green alga Scenedesmus subspicatus. Zeist, TNO, May (Report No. V2492/04). 

Schering AG (1999a) Growth inhibition test of di-n-butyltin dilaurate (ZK 21976) on the green algae, Scenedesmus subspicatus. Berlin, Schering AG, 17 February (Research Report No. IC29). 

Some green algae are able to use aromatic sulfonic acids (Figure 2.4a) (Soeder et al. 1987) and aliphatic sulfonic acids (Figure 2.4b) (Biedlingmeier and Schmidt 1983) as sources of sulfur. Cultures of Scenedesmus obliquus under conditions of sulfate limitation metabolized naphthalene-l-sulfonate to l-hydroxy-naphthalene-2-sulfonate and the gluco-side of naphth-l-ol (Kneifel et al. 1997). These results are consistent with formation of a 1,2-epoxide followed by an NIH shift. 

Two studies have used single cells to study the effect of phenolic acids on mineral absorption. In sterile cell cultures of Paul s Scarlet rose, 100 pM ferulic acid inhibited Rb+ absorption in about 10 min when the cells were 4-5 days old (37). Uptake from 0.2 mM RbCl was inhibited about 25% and absorption from 5.0 mM RbCl was inhibited 45%. Absorption by 10-day-old cells was affected little. Salicylic acid at 10 pM inhibited PO - absorption by Scenedesmus, a unicellular green alga (38). These studies show that allelochemicals inhibit mineral absorption in cellular systems as well as tissue systems (Table I). 

Accumulation of organotin compounds in freshwater alga, Sc (Scenedesmus obliquus), and marine alga, Du (Dunaliella salina), is shown in Table 13. It was found that freshwater and marine algae accumulated organotin at a very high level81. 

The relative toxicity of organotin compounds to alga Scenedesmus obliquus is shown in Table 12. Pettibone and Cooney investigated the toxicity of methyltins (MMT MeSnCl3 DMT Me2SnCl2 and TMT Me3SnCl) to microbial populations in estuary sediments in... 

BCF = (cone, of TBT in algae [pg g 1 /(cone. of TBT in supernatant medium 111 g g i. Sc denotes Scenedesmus obliquus-, Du denotes Dunaliella salina. 

Glooschenko, V., M. Holdrinet, J.N.A. Lott, and R. Frank. 1979. Bioconcentration of chlordane by the green alga Scenedesmus quadricauda. Bull. Environ. Contam. Toxicol. 21 515-520. 

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