Engineering Control naturally occurring

Kohn, J., and Langer, R., A new approach to the development of bioerodible polymers for controlled release applications employing naturally occurring amino acids, in Proceeding of the ACS Division of Polymeric Materials. Science and Engineering. American Chemical Society, 1984, Vol. 51, pp. 119-121. 

By rect comparison of structural and functional characteristics of different, naturally-occurring enzymes and modified biocatalysts, researchers hope to delineate the structural features controlling the hydrolytic and S3mthetic catalytic activities of this family of glucosylases. This understanchng will eventually lead to the ability to "engineer" glucan biocatalyst capability. 

For reviews of the literature on insecticides from plants see USDA Agricultural Handbooks 154 (1958) and 461 (1975). and The American Chemical Society publication "Natural Pest Control Agents" (1966), all cited in reference 4. Further citations are given by Balandrin et al. (ref. 3). The chemistry and mechanism(s) of action of naturally occurring herbicides is treated by Putnam in a recent report in Chemical and Engineering News (C EN) (ref. 7)-... 

A large number of biologically active molecules are obtained from naturally occurring plants and animal resources. The advances in biotechnology in the past several decades enable the production of many desired compounds under controlled conditions using engineered microorganisms and cells from animals and plants. The recovery of desired products from various sources... 

Examples of biomaterials include sodium hyaluronate, a naturally occurring biopol3nner used to reduce the incidence of postsurgical adhesions polymer-based materials for controlled-drug release and tissue engineered scaffolds to... 

The coupled biogeochemical cycling of iron and arsenic has also recently been studied in a system dominated by the addition of iron as an engineering practice.14 Since 1996, ferric chloride has been added as a coagulant to the Los Angeles Aqueduct in order to control the levels of naturally occurring arsenic that reach the water distribution system for the City of Los Angeles. The iron- and arsenic-rich floe formed by this process is deposited in North Haiwee Reservoir. Sediments and porewaters from this reservoir were examined to determine the extent to which arsenic and iron are remobilized in the sediments and to probe the speciation of arsenic in the solid phase and its possible effects on arsenic remobilization. 

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