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Wet  biomass  (0.4  g)  was  ground  in  1.2  ml  of  2%  (wt/vol) trichloroacetic acid (Fisher Scientific, Hampton, N.H.) in a chilled mortar and pestle with 0.2 g of ground glass beads and then centrifuged for 5 min. Polypho-sphate of different chain lengths was extracted from the supernatant using the methods of Clark et al. (10). Polyphosphate concentration was determined in the fractions  as  orthophosphate  using  the  colorimetric  assay  of  Saheki  et  al.  (39). Prior  to  analysis,  polyphosphate  in  the  fractions  was  converted  to  orthophos-phate by acid hydrolysis, and orthophosphate released from polyphosphates was differentiated from orthophosphate from other sources by previously published methods (25). For ICP-OES analysis, samples were acidified with 1 ml of con-centrated nitric acid, diluted to 12 ml with MilliQ dH2O, and filtered with 0.2 m mesh syringe filters as described above.
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Originally posted by pclo515 at 2010-10-19 18:17:25:
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