By E A Ghabbour, G. Davies
The houses of humic ingredients (HSs) in crops, soils and sediments keep an eye on the surroundings and have an effect on all elements of like, but they're basically very imprecisely understood. This quantity offers paintings on HSs together with tools and methods being constructed to throw extra mild on their constitution and dating to macro- and micro-scopic houses
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The most likely possibilities are that this new band represents either a low molecular weight aliphatic acid or a quinone. W o o t e n found that the chemical shifts of the carboxylate bands of potassium salts of citric and malic acid are between 178 and 182 ppm. Endogenous polyphenol oxidases such as those that are thought to be active during senescence can convert 0-diphenols to 0 - q u i n o n e s . The 17 17 39 18 chemical shifts of o-quinones are near 180 ppm. 4 CONCLUSIONS The biochemical processes that are active during senescence of leaves cause changes in the chemical structures and relative concentrations of the major components of the leaves that can be detected by solid-state C N M R spectroscopy.
A. J. Simpson, R. E. Boersma, W . L. Kingery, R. P. Hicks and M . H. B . Hayes, in ' H u m i c Substances, Peats and Sludges: Health and Environmental A s p e c t s ' , M . H. B . Hayes and W . S. ), The Royal Society of Chemistry, Cambridge, U K , 1997, p. 46. D . G. Gadian, 'Nuclear Magnetic Resonance and Its Application to Living S y s t e m s ' , Oxford University Press, Oxford, 1982. A. J. Simpson, J. Burdon, M . H. B . Hayes, N . Spencer and W . J. Kingery, submitted to European J. Soil Sci.
B . Hayes and W . S. ), T h e Royal Society of Chemistry, Cambridge, U K , 1997, p . 8 3 . C. M . , 1 9 9 6 , 1 6 1 , 144. A. J. Simpson, R. E. Boersma, W . L. Kingery, R. P. Hicks and M . H. B . Hayes, in ' H u m i c Substances, Peats and Sludges: Health and Environmental A s p e c t s ' , M . H. B . Hayes and W . S. ), The Royal Society of Chemistry, Cambridge, U K , 1997, p. 46. D . G. Gadian, 'Nuclear Magnetic Resonance and Its Application to Living S y s t e m s ' , Oxford University Press, Oxford, 1982.