Quantitative relation between ozone concentration and reduction of photosynthesis of Euglena gracilis

Koning, H. W. de; Jegier, Z.

doi:10.1016/0004-6981(68)90068-1

Cited by 12 publications

(3 citation statements)

References 3 publications

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“…Ozone has been found to reduce chlorophyll concentration in loblolly pine (Sasek and Richardson, 1989;Elsik et al, 1992) and the results of this experiment are consistent. Chlorophyll b has been reported to be more easily destroyed than chlorophyll a (DeKonig and Jegier, 1968;Nobel, 1974;Runeckles and Chevone, 1992); however, this was not observed. Both chlorophyll a and b concentration decreases were similar.…”

Section: Discussionmentioning

confidence: 91%

Environmental Pollution

Logan

1971

The Journal of Environmental Education

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"Capsule": Polyacrylamide used in irrigation reduces soil erosion and pathogen transport. AbstractPolyacrylamide (PAM) use in irrigation for erosion control has increased water infiltration and reduced soil erosion. This has improved runoff water quality via lower concentrations of nitrogen, phosphorous, and pesticides, and decreased biological oxygen demand. Since non-toxic high molecular weight anionic PAMs removed clay size sediment particles in flowing water, we hypothesized that PAM would effectively remove or immobilize microorganisms in flowing water. In an agricultural field, we determined the efficacy of PAM-treatment of furrow irrigation water to remove several categories of microorganisms in the inflow and runoff. Treatments were: (I) PAM application and a control; (2) three flow rates; (3) two distances from the inflow point; and (4) three times during each irrigation. After water traveled 1 m at 7.5 and 15.5 1 min-1 , PAM-treatment reduced total bacterial and microbial biomass and total fungal biomass relative to the control treatment. After water traveled 40 m at 7.5, 15.5, and 22.5 1 min-1 PAM-treatment reduced algae, the numbers active and total bacteria, active and total fungal length, and total bacterial biomass, total fungal and microbial biomass relative to the control treatment. Although specific organisms were not identified or monitored in this study, the results clearly have implications for controlling the spread of soil-borne plant pathogens and other classes of harmful organisms within and among fields via irrigation water and in re-utilized return flows. Beyond furrow-irrigated agriculture, new methods to manage overland transmission of harmful microorganisms could potentially help control transport of pathogens from animal waste in runoff and groundwater. Published by Elsevier Science Ltd.

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Section: Discussionmentioning

confidence: 91%

Environmental Pollution

Logan

1971

The Journal of Environmental Education

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“…Although the various atmospheric pollutants are derived from a variety of anthropogenic and natural sources, anthropogenic production of a specific pollutant may or may not exceed natural 354 …”

Section: Introductionmentioning

confidence: 99%

“…352 However, exposures to 1 or 2 ppm SO 2 increased the photosynthetic rate of the alga. 353 Ozone was destructive to the chlorophyll 'b' content of the algal cell, 354 whereas exposure to 5 ppm SO 2 for 1 hr decreased the photosynthetic rate, and yet increased the chlorophyll 'a' content of the algal cell. 352 ' 353 Combined exposure to 0.5 ppm O 3 and 2.2 ppm SO 2 for 1 hr did not influence the algal photosynthetic rate, whereas exposures to 0.5 ppm O3 and 5 ppm SO 2 for 1 hr decreased the photosynthetic rate.…”

mentioning

confidence: 98%