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Resultados 1621-1630 de 62,084
Disease outbreaks caused by drinking water [Bacteria, viruses].
1982
Dufour A.P.
Advanced biological treatment to achieve nutrient removal [Nitrogen and phosphorus].
1982
Burdick C.R. | Refling D.R. | Stensel H.D.
Environmental controls: are they swords of Damocles? [Special reference to water pollution].
1982
Mackenthun K.M.
Geochemical environments and the geographical distribution of some diseases in Sri Lanka.
1982
Dissanayake C.B. | Senaratne A.
A survey of on the incidence of dental diseases and the distribution of fluoride in drinking water wells in Sri Lanka, confirms that a distinct causal relationship exists and is clearly geographically related. A similar study on the incidence of total cancer in Sri Lanka in relation to environmental factors such as rainfall, concentration of total dissolved ions, hardness of drinking well water, etc. showed an association resting entirely upon correlation.
Mostrar más [+] Menos [-]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.
Mostrar más [+] Menos [-]Application of the wastewater effluent of a rural community to a mountain meadow [Colorado].
1982
Barbarick K.A. | Sabey B.R. | Evans N.A.
Lagoons and oxidation ponds [Used for livestock wastes].
1982
George D.B.
Land application of wastewater [through irrigating crops].
1982
Reynolds J.H.
Identification of aniline dyes by pyrolysis-GC-mass spectrometry [Pollution of environments].
1982
Abbey L.E. | Gould J.P. | Moran T.F.
Inhibition of nitrification by arsenic, chromium, and fluoride [Pollution from, fertilizer, coking refining, food processing, organic chemical industries].
1982
Beg S.A. | Siddiqi R.H. | Ilias S.
