Author: Robert L. Booth
Publisher:
ISBN:
Category :
Languages : en
Pages : 24
Book Description
Evaluation of the U.S. Geological Survey Laboratory, Denver, Colorado
Author: Robert L. Booth
Publisher:
ISBN:
Category :
Languages : en
Pages : 24
Book Description
Publisher:
ISBN:
Category :
Languages : en
Pages : 24
Book Description
Evaluation of the U.S. Geological Survey Laboratory, Denver, Colorado
Author: Robert L. Booth
Publisher:
ISBN:
Category :
Languages : en
Pages : 0
Book Description
Publisher:
ISBN:
Category :
Languages : en
Pages : 0
Book Description
Evaluation of the U.S. Geological Survey Laboratory, Atlanta, Georgia
Author: Robert L. Booth
Publisher:
ISBN:
Category : Water
Languages : en
Pages : 24
Book Description
Publisher:
ISBN:
Category : Water
Languages : en
Pages : 24
Book Description
Evaluation of the U.S. Geological Survey Laboratory, Denver, Colorado
Author: Robert L. Booth
Publisher:
ISBN:
Category :
Languages : en
Pages : 24
Book Description
Publisher:
ISBN:
Category :
Languages : en
Pages : 24
Book Description
The U.S. Geological Survey's Central Region Headquarters, Denver, Colorado
Author: Geological Survey (U.S.)
Publisher:
ISBN:
Category :
Languages : en
Pages : 28
Book Description
Publisher:
ISBN:
Category :
Languages : en
Pages : 28
Book Description
Water-quality Data-collection Activities in Colorado and Ohio
Author: Carolyn J. Oblinger
Publisher:
ISBN:
Category : Water quality
Languages : en
Pages : 0
Book Description
Publisher:
ISBN:
Category : Water quality
Languages : en
Pages : 0
Book Description
NBS Special Publication
Author:
Publisher:
ISBN:
Category : Weights and measures
Languages : en
Pages : 234
Book Description
Publisher:
ISBN:
Category : Weights and measures
Languages : en
Pages : 234
Book Description
Colorimetric Determination of Nitrate Plus Nitrite in Water by Enzymatic Reduction, Automated Discrete Analyzer Methods
Author: Charles J Patton
Publisher: CreateSpace
ISBN: 9781500223311
Category : Technology & Engineering
Languages : en
Pages : 44
Book Description
This report documents work at the U.S. Geological Sur- vey (USGS) National Water Quality Laboratory (NWQL) to validate enzymatic reduction, colorimetric determinative meth- ods for nitrate + nitrite in filtered water by automated discrete analysis. In these standard- and low-level methods (USGS I-2547-11 and I-2548-11), nitrate is reduced to nitrite with nontoxic, soluble nitrate reductase rather than toxic, granular, copperized cadmium used in the longstanding USGS auto- mated continuous-flow analyzer methods I-2545-90 (NWQL laboratory code 1975) and I-2546-91 (NWQL laboratory code 1979). Colorimetric reagents used to determine resulting nitrite in aforementioned enzymatic- and cadmium-reduction meth- ods are identical. The enzyme used in these discrete analyzer methods, designated AtNaR2 by its manufacturer, is produced by recombinant expression of the nitrate reductase gene from wall cress (Arabidopsis thaliana) in the yeast Pichia pastoris. Unlike other commercially available nitrate reductases we evaluated, AtNaR2 maintains high activity at 37°C and is not inhibited by high-phenolic-content humic acids at reaction temperatures in the range of 20°C to 37°C. These previously unrecognized AtNaR2 characteristics are essential for success- ful performance of discrete analyzer nitrate + nitrite assays (henceforth, DA-AtNaR2) described here.
Publisher: CreateSpace
ISBN: 9781500223311
Category : Technology & Engineering
Languages : en
Pages : 44
Book Description
This report documents work at the U.S. Geological Sur- vey (USGS) National Water Quality Laboratory (NWQL) to validate enzymatic reduction, colorimetric determinative meth- ods for nitrate + nitrite in filtered water by automated discrete analysis. In these standard- and low-level methods (USGS I-2547-11 and I-2548-11), nitrate is reduced to nitrite with nontoxic, soluble nitrate reductase rather than toxic, granular, copperized cadmium used in the longstanding USGS auto- mated continuous-flow analyzer methods I-2545-90 (NWQL laboratory code 1975) and I-2546-91 (NWQL laboratory code 1979). Colorimetric reagents used to determine resulting nitrite in aforementioned enzymatic- and cadmium-reduction meth- ods are identical. The enzyme used in these discrete analyzer methods, designated AtNaR2 by its manufacturer, is produced by recombinant expression of the nitrate reductase gene from wall cress (Arabidopsis thaliana) in the yeast Pichia pastoris. Unlike other commercially available nitrate reductases we evaluated, AtNaR2 maintains high activity at 37°C and is not inhibited by high-phenolic-content humic acids at reaction temperatures in the range of 20°C to 37°C. These previously unrecognized AtNaR2 characteristics are essential for success- ful performance of discrete analyzer nitrate + nitrite assays (henceforth, DA-AtNaR2) described here.
Participation in Performance-evaluation Studies by U.S. Geological Survey, National Water Quality Laboratory
Author:
Publisher:
ISBN:
Category : Environment sampling
Languages : en
Pages : 6
Book Description
Publisher:
ISBN:
Category : Environment sampling
Languages : en
Pages : 6
Book Description
U.S. Geological Survey Water-supply Paper
Author:
Publisher:
ISBN:
Category : Water-supply
Languages : en
Pages : 284
Book Description
Publisher:
ISBN:
Category : Water-supply
Languages : en
Pages : 284
Book Description