Refine search
Results 1-3 of 3
The effect of reciprocal treatments with ozone and ultraviolet-B radiation on photosynthesis and growth of perennial grass Elymus athericus
1997
Staaij, J.W.M. van de | Tonneijck, A.E.G. | Rozema, J. (Department of Ecology and Ecotoxicology, Vrije Universiteit, De Boelelaan 1087, 1081 HV Amsterdam (Netherlands))
Increased UV-B radiation reduces N2-fixation in tropical leguminous crops
1997
Anupa Singh (Department of Botany, Banaras Hindu University, Varanasi-221 005 (India))
Photolytic degradation of fluoroquinolone carboxylic acids in aqueous solution : Part I: Primary photoproducts and half-lives (ESPR 1/1997, pp. 10–15) Part II: Isolation and structural elucidation of polar photometabolites (ESPR 2/1997, pp. 61–67)
1997
Burhenne, Jürgen | Ludwig, Marc | Spiteller, M. (Michael)
Subsequent to irradiation with a xenon lamp simulating sunlight, fluoroquinolone carboxylic acids in aqueous solution form polar pyridone dicarboxylic and tricarboxylic acids. After liquid/liquid partition with chloroform/water these substances can be isolated by ion exchange chromatography of the aqueous phase. They can be regarded as intermediate compounds on the route to a complete photomineralization. The structural elucidation is performed by such mass spectroscopic methods as MS, GC/MS and HPLC/MS, whereby HPLC/MS shows the highest reliability. Additionally¹H- and¹³C-NMR measurements confirm the structure of the main polar degradation product.
Show more [+] Less [-]