A high-impedance comparator suitable for monitoring the resistivity of a deionized or distilled water line supplying water in the 50 Kohm/cm-2 Mohm/cm range is described. Includes information on required circuits (with diagrams), sensor probe assembly, and calibration techniques. (JN)

Describes an inexpensive and convenient way to solve the problem of maintaining the proper humidity needed in incubation chambers. (JN)

The renin-angiotensin system (RAS) maintains salt and water balance. Discusses functions of the RAS as defined in mammalian species, considering how the system arose and what its original function was. Also discusses where some of the changes occurred in the system (and why) as well as other topics. (JN)

Emerging public issues are frequently preceded by signals in the social or political environment. Provided are examples of scanning and monitoring techniques used to detect the following issues: water as a natural resource, social acceptability of the chemical industry, and rights in jobs. (RM)

The use of remote sensing to quickly detect and efficiently monitor environmental problems is discussed. Available technology, typical operations procedure, and film choice are detailed. (BT)

Water conservation and usage is an important concept in science. This document, geared specifically to New England, provides many activities for protecting and discussing ground water situations. Sample activities for grades K-6 include: (1) All the Water in the World; (2) The Case of the Disappearing Water; (3) Deep Subjects--Wells and Ground…

This document discusses an introductory biology course that uses constructivist principles. Students observed phenomena and were engaged in activities before studying the content to ensure that the laboratory sections of the course were more than "look and see" or confirmatory experiments. The student handout is provided. (YDS)

This manual demonstrates how drinking water in schools and non-residential buildings can be tested for lead and how contamination problems can be corrected when found. The manual also provides background information concerning the sources and health effects of lead, how lead gets into drinking water, how lead in drinking water is regulated, and…

Discusses a number of ways in which food processing innovations have actual or potential value in drastically reducing waste, maintaining product quality and improving product yield. (JR)

The findings of the 1972 Environmental Job Opportunities Survey indicate that the widely held view that environmental pollution control activities will generate large numbers of new jobs is overly optimistic. However the limitations of the survey are pointed out, with the suggestion that caution be applied in the interpreting its results. (SA)

Reviewed are accomplishments, problems, and frustrations faced by individual states in meeting requirements of P.L. 92-500, Federal Water Pollution Control Act Amendments of 1972. State Environmental officials complain the new law may be a hindrance to established cleanup programs. Statistics and charts are given. (BL)

Discusses the roles of leading firms, consulting engineers and equipment manufacturers in the growing field of water pollution control. Reviews of individual companies are given. (BL)

Icebergs in Antarctic and Greenland can be used to supply fresh water. This is technologically possible and a potential solution to the problem of fresh water resources. (PS)