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Results 1481-1490 of 62,508
Dissolved oxygen in streams and reservoirs [Water quality standards, pollution effects on aquatic life].
1982
Bohac C.E.
Water quality in urban streams: what we can expect [USA].
1982
Duda A.M. | Lenat D.R. | Penrose D.L.
Disinfection [Potable water].
1982
Haas C.N. | McCreary J.J.
Identification of aniline dyes by pyrolysis-GC-mass spectrometry [Pollution of environments].
1982
Abbey L.E. | Gould J.P. | Moran T.F.
Effect of liquid wastewater sludge application on crop yield and water quality.
1982
Duncomb D.R. | Larson W.E. | Clapp C.E. | Dowdy R.H. | Linden D.R. | Johnson W.K.
Reduction in soybean yield after exposure to ozone and sulfur dioxide using a linear gradient exposure technique.
1982
Reich P.B. | Amundson R.G. | Lassoie J.P.
A linear gradient field exposure system was modified from one originally described by Shinn et al. (1977) and used to expose field grown soybeans (Glycine max cv Hark) to a concentration gradient of a mixture of two gaseous pollutants: SO(,2) and O(,3). Since this technique does not use enclosures, study plants experienced near ambient fluctuations in environmental conditions, including wind, and hence were exposed to widely fluctuating pollutant concentrations. Plants in the gradient system were exposed to both pollutants for 57 h on 12 days during the pod-filling period (31 August-17 September). Mean concentrations during the 57 h of exposure at the 'high' end of the gradient were 0.16 and 0.06 mu-l/l (ppm) SO(,2) and O(,3), respectively, with 10 h at greater than 0.25 and 0.10 mu-l/l h SO(,2) and O(,3), respectively. Total doses for these plants were estimated to be 9.0 and 3.5 mu-l/l. h SO(,2) and O(,3), respectively. Comparison with plants exposed to ambient air indicated that exposure to SO(,2) and O(,3) reduced total yield per plant and dry mass per bean by as much as 36 and 15%, respectively. Since concurrent exposure to a much higher dosage of SO(,2) alone (20.2 mu-l. h) was observed in a separate experiment to have no significant effect on yield, O(,3), although present at moderately low levels, was probably responsible (alone or synergistically with SO(,2)) for the greatest reduction in seed size and yield.
Show more [+] Less [-]Environmental controls: are they swords of Damocles? [Special reference to water pollution].
1982
Mackenthun K.M.
Bioaccumulation and toxicity of heavy metals and related trace elements [Accumulation in aquatic plants and animals].
1982
Murphy C.B. Jr. | Spiegel S.J.
Eutrophication [Lake restoration, phytoplankton dynamics].
1982
Medine A.J. | Porcella D.B.
Lagoons and oxidation ponds [Used for livestock wastes].
1982
George D.B.
