Biohazards Symbol: Development of a Biological Hazards Warning Signal

Author:

Baldwin Charles L.1,Runkle Robert S.2

Affiliation:

1. Dow Biohazards Research and Development Department, Pitman-Moore Division, The Dow Chemical Company, Indianapolis, Indiana

2. National Cancer Institute, Bethesda, Maryland

Publisher

American Association for the Advancement of Science (AAAS)

Subject

Multidisciplinary

Reference15 articles.

1. H. Craig , Geochim. Cosmochim. Acta 3 , 53 ( 1953 ); S. R. Silverman, Isotopic and Cosmic Chemistry (North-Holland, Amsterdam, 1964), chap. 8.

2. F. A. Rohrman , B. J. Steigerwald , J. H. Ludwig , Science 156 , 931 ( 1967 ).

3. J. F. Clarke and R. B. Faoro , J. Air Pollut. Contr. Ass. 16 , 212 ( 1966 ).

4. H. Craig (1) reported a variation in the isotopic composition of carbon in CO2 obtained from air in Chicago. He tabulated values that differ by approximately 2.0 per mil in air sampled during the week and on Sundays. His technique did not include gas chromatographic purification prior to analysis by mass spectrometer; variations nearly as large as those observed between weekdays and Sundays were observed in samples taken during the week. Craig left open the ques

5. tion of the role of industrially emitted CO2

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