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    Title: Calcium is required for the increase of dark respiration during diurnal nitrogen fixation by Synechococcus RF-1
    Authors: Chen,Tsung-Hsien;Huang,Tan-Chi;Chow, Te-Jin
    Contributors: 輔英科技大學 生物科技系
    Keywords: calcium;cyanobacteria;nitrate;nitrogen fixation;respiration;Synechococcus
    Date: 1989-06-01
    Issue Date: 2010-09-24 09:46:17 (UTC+8)
    Abstract: Under 12/12 h light/dark cycles, 1 mM ethyleneglycol-bis-(β-aminoethyl ether)-N,N,N′,N′-tetraacetic acid (EGTA, pH 8.0) added at the start of the dark period, inhibited the increase of dark respiration which was associated with nitrogen fixation in Synechococcus RF-1. Twenty-five millimolar NaNO3 added 30 min before the start of dark period suppressed this respiratory increase. If 1.25 mM CaCl2 was added to the EGTA-treated sample from 3 to at least 10 h later in the dark period, a quick rise in respiratory rate was observed. This rise was also reduced by 25 mM NaNO3. Extracellular Ca2+ appears to be required for the increase in dark respiration associated with the rhythmic appearance of nitrogenase activity in the dark cycle.
    Relation: Plant Science,Volume 60, Issue 2, Pages 195-198
    Appears in Collections:[Department of Biotechnology] Journal Article

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