Sources, for lead

Anthony S. Fauci et al., eds. Harrison s Principles of Internal Medicine. 14th ed. New York McGraw-Hill, 1998. Source for lead poisoning symptoms. 

Walter Stolov. e-mail communication. Nov. 5, 1999. Source for lead poisoning s effect on polio. 

James Whorton. Before Silent Spring Pesticides and Public Health in Pre-DDT America. Princeton, NJ Princeton University Press, 1974. Source for lead arsenate insecticide and Terres article. 

Thomas G. Spiro and William M. Stigliani. Chemistry of the Environment. New Jersey Prentice Hall, 1996. Source for lead-halide particles lead paint on school buses, highways, and bridges. 

As indicated in the Introduction, only a brief survey of hetero electrocyclizations will be presented hoe. The reader should rdier to Marvell s excellent treatise or other sources for leading references. However, there are several unique features of die heterocyclizadon process that are worth considering in this limited survey. In particular, when the heteroatom is placed at Ae end of the triene system, cycliza-tions often prove to be exceedingly facile. To focus on diis feature of the reaction substrate, the following discussion will be restricted to electrocyclizations in which the heteroatom (oxygen and nitrogen since they are the most common) is located at the end of the triene. 

Brannvall M. L., Kurkkio H., Bindler R., Emteryd O., and Renberg I. (2001) The role of pollution versus natural geological sources for lead enrichment in recent lake sediments and surface forest soils. Environ. Geol. 40, 1057-1065. 

Natural Products as Pharmaceuticals and Sources for Lead Structures... 

NATURAL PRODUCTS AS PHARMACEUTICALS AND SOURCES FOR LEAD STRUCTURES... 

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