Publication Date:
1999-11-13
Description:
Humic substances (HSs) are the natural organic polyelectrolytes formed from the biochemical weathering of plant and animal remains. Their macromolecular structure and chemistry determine their role in biogeochemical processes. In situ spectromicroscopic evidence showed that the HS macromolecular structures (size and shape) vary as a function of HS origin (soil versus fluvial), solution chemistry, and the associated mineralogy. The HSs do not simply form coils in acidic or strong electrolyte solutions and elongated structures in dilute alkaline solutions. The macromolecular structural changes of HSs are likely to modify contaminant solubility, biotransformation, and the carbon cycle in soils and sediments.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Myneni -- Brown -- Martinez -- Meyer-Ilse -- New York, N.Y. -- Science. 1999 Nov 12;286(5443):1335-7.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉Earth Sciences Division, Center for X-ray Optics, Lawrence Berkeley National Laboratory, Berkeley, CA 94720, USA. Department of Geosciences, Princeton University, Princeton, NJ 08544, USA. Agriculture Experimental Station, University o.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/10558983" target="_blank"〉PubMed〈/a〉
Print ISSN:
0036-8075
Electronic ISSN:
1095-9203
Topics:
Biology
,
Chemistry and Pharmacology
,
Computer Science
,
Medicine
,
Natural Sciences in General
,
Physics
