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enzymatically　SOLVENT－FREE　SYNTHESIS　OF　SUGAR　ESTER　CONTAINING　ω－3　POLYUNSATURATED　FATTY　ACID

Chinese Chemical Letters 1996年第7期7卷 611-614页

作者： Zu Yi Li Owen P. Ward(1.Shanghai Institute of Organic Chemistry Academia Sinica Shanghai,200032)(2.Department of Biology,University of Waterloo,Waterloo,Ontario N2L3GI,Canada) Shanghai Inst. Organ. Chem. Acad. S. Shanghai 200032 Department of Biology University of Waterloo Waterloo Ont. N2L3GI Canada

A enzymatic synthesis of sugar ester from isopropylidenesugar and ω-3polyunsaturated fatty acid was studied.Esterification with Lipase N-435 gave the bestresult.

关键词： ACID FATTY enzymatically CONTAINING

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Land Use Impact on Bioavailable Phosphorus in the Bronx River, New York

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Journal of Environmental Protection 2011年第4期2卷 342-358页

作者： Jingyu Wang Hari Pant 不详

Various forms of phosphorus (P) could become bioavailable such as from desorption, dissolution and enzymatic hydrolysis. Potential bioavailable P estimation is critical to minimize eutrophication in freshwater systems. Thus, this study was conducted to predict potential bioavailable P in the water columns and sediments and their relations with enzymatic hydrolysis, and estimate impacts of land use and anthropogenic activities on P bioavailability, P transport and water quality in the Bronx River, New York, USA. In sediment samples collected in 2006, total P (TP), total inor-ganic P (IP), total organic P (OP) and bioavailable P (BAP) were in highest concentrations in sites located at Bronx River Valley upstream in Westchester (site 2), Troublesome Brook (TB, site 4), Sprain Brook (SB, site 7b) and Bronx River estuary near Sound View Park (site 14) respectively. Also, phosphodiesterase and native phosphatases (PDEase and NPase) hydrolyzed distinguishingly high amounts of OP or enzymatically hydrolysable P (EHP) in samples from sites 4, 7b, 10 (New York Botanical Garden) and 14. Microbial P was in negative values (caused by different bacteria and microorganisms could not be paralyzed by chloroform), and the most negative concentrations were appeared at sties 4 and 14. Spatial comparisons among different locations showed distinguished characteristics in tributaries and estuary. In sediments collected in 2007, TP, BAP and IP were in highest concentrations at sites 7-SB, 11-Bronx Zoo, 12-East Tremont Ave Bridge where fresh and saline water meets, 13-estuary facing Hunts Point Waste Water Treatment Plant (HP WWTP) and 14-estuary along Sound View Park. Besides, PDEase-P highest concentrations ap-peared at sties 7, 13 and 11, NPase-P concentrations were highest at 7 and 11. Microbial P was highest at sties 11 and 14. Spatial variations showed that higher P content and more intense enzymatic hydrolysis in silty clay finer sediments at site 7, 11 and 13. Temporal variations between the two years’ data showed land use and ot

关键词： Potential Bioavailable P Enzymatic Hydrolysis Microbial P enzymatically Hydrolysable P Spatial and Temporal Variations

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