ISSN:1025-6016    

DOI:10.1080/10256019508036283

出版商:Taylor & Francis Group    

年代:1995

数据来源: Taylor

摘要:

In order to perform the15N/14N analysis of amino acids using a gas chromatograph and isotope ratio mass spectrometer linked up via a combustion interface (GC-C-IRMS), the amino acids must be derivatized. Tert-butyldimethylsilylation is examined using various techniques (direct conversion to nitrogen gas, ConFlo-IRMS [1], GC-C-IRMS [2]) and subsequently applied to isotopic characterization of amino acids from wheat protein hydrolyzate obtained from plants exposed to ozone. The method provides a reliable tool for studying ecotoxicological effects on plants at a molecular level in addition to the investigation of the natural variations of different N fractions.

ISSN:1025-6016    

DOI:10.1080/10256019508036284

出版商:Taylor & Francis Group    

年代:1995

数据来源: Taylor

摘要:

Airborne nitrogen-inputs so far have only been measured in single fractions (deposition on plant surfaces or on soil and direct absorption of nitrogen containing gases by plants) by intensive exposition experiments in gas chambers, measurement of wet and dry N-deposition in the field and very expensive micrometereological field measurements. It is very difficult to estimate any overall N-input with practical relevance from these single N-component measurements. In this introduced field experiment an isolated measuring system is labelled with a15N-tracer since it is not possible to label the nitrogen compounds of the atmosphere (e.g. NH3, NOx) which are to be absorbed. Through the dilution of this15N-tracer by nitrogen derived from the atmosphere the total input of airborne nitrogen is determined. As soil resembling substrate sand was used and summer wheat was planted. With the regular and automated irrigation of nitrogen-free nutrient solution and the collection of precipitation surpluses this system measured the total input of airborne nitrogen for one vegetation period.

ISSN:1025-6016    

DOI:10.1080/10256019508036285

出版商:Taylor & Francis Group    

年代:1995

数据来源: Taylor

ISSN:1025-6016    

DOI:10.1080/10256019508036286

出版商:Taylor & Francis Group    

年代:1995

数据来源: Taylor

摘要:

This is a scanned image of the original Editorial Board page(s) for this issue.

ISSN:1025-6016    

DOI:10.1080/10256019508036262

出版商:Taylor & Francis Group    

年代:1995

数据来源: Taylor