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L-Asparaginase Activity In Some Soils Of Central Iran

F. Nourbakhsh, C. Monreal, G. Emtiazy, H. Dinel
Published 2002 · Geology

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This study was conducted to investigate L-asparaginase activity in relation to some soil physical and chemical properties and to assess the effects of Cr, Cd, and Pb on the enzyme activity. L-asparaginase activity was significantly correlated with organic carbon (r = 0.867, P < 0.001), total nitrogen (r = 0.784, P < 0.001) and biological index of nitrogen availability (r = 0.816, P < 0.001), whereas it was not correlated with sand, silt, and clay contents. L-asparaginase activity was negatively correlated with electrical conductivity of saturation paste extracts (r = -0.59, P < 0.01) and sodium adsorption ratio (r = -0.58, P < 0.01). Multiple stepwise regression revealed that 80.4% of L-asparaginase activity variation was due to organic carbon and sodium adsorption ratio. Cd and Pb inhibited soil L-asparaginase to a similar extent (by 23%), and did so to a greater extent than did Cr (13.5%).
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