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Hg and As are widespread contaminants globally and particularly in Asia. We conducted a field study in Baiyangdian Lake, the largest lake in the North China Plain, to investigate bioaccumulation and trophic transfer of potentially toxic metals (total mercury and arsenic) in sites differing in proximity from the major point sources of nutrients and metals.(More)
A 154-residue mini-intein from the dnaB gene of Synechocystis sp. PCC 6803 (Ssp DnaB intein) has been purified and crystallized using PEG 4000 as a precipitant. The crystal belongs to space group P3(1)21 or P3(2)21, with unit-cell parameters a = b = 58.2, c = 70.3 A. It has one molecule per asymmetric unit and diffracts to beyond 2.0 A under cryoconditions(More)
A naturally occurring split intein from the dnaE gene of Synechocystis sp. PCC6803 (Ssp DnaE intein) has been purified and crystallized using PEG 8K as precipitant. The crystal belongs to space group P3(1)21 or P3(2)21, with unit-cell parameters a = b = 58.5, c = 70.2 A. It has one molecule per asymmetric unit and diffracts to beyond 2.9 A under(More)
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