Physical measures to inhibit planktonic cyanobacteriae

In a small lake, intermittent destratification was installed after several other physico-chemical and physical in-lake therapy measures (phosphorus immobilization, permanent destratification) had been tested without great success. If an aerobic sediment-water interface can be maintained, intermittent destratification removes cyanobacteria and prevents optimal development of other members of the photoautotrophic plankton. During growing seasons, increasing abundances of small-bodied herbivores (Bosmina) and Daphnia may have accounted for relatively low phytoplankton biomass as well. Intermittent destratification is a very fast-working in-lake measure and seems to be applicable even in relatively shallow lakes (< 15 m), in which permanent destratification seems to be risky

Review of methods for assessing the carcinogenic hazards from coal-using energy technologies

This report contains material relevant to the development of methodologies for evaluating the cancer risks associated with atmospheric pollutants from coal combustion and conversion processes. Information is presented on methods and sources (1) of regression analyses in this field, and (2) of physically significant simulation mechanisms, including potential functional modules of such mechanisms, particularly those modules dealing with energy facility emission characterizations, atmospheric dispersion, aerochemistry, population exposure patterns, and carcinogenic dose-response studies. In addition to listings of several key references and bibliographies in these areas, there is a discussion of some of the research in progress, the urgency of the situation, and some of the barriers to the development and dissemination of timely results