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结果 31-40 的 306
Effects of low-level SO2 fumigation on decomposition of western wheatgrass litter in a mixed-grass prairie.
1981
Dodd J.L. | Lauenroth W.K.
Aquatic sediments [Constituents, biological activity].
1981
DePinto J.V. | Young T.C. | Martin S.C.
Eutrophication [Nutrient loading concepts].
1981
Medine A.J. | Porcella D.B.
Fresh water macroinvertebrates [as indicators of water pollution].
1981
Quigley M.A.
Meat-, fish-, and poultry-processing wastes [Effluent treatment systems].
1981
Litchfield J.H.
Deposition of sulphur gases from multiple scattered sources in Alberta [Canada].
1981
Walker D.R. | Dick A.C. | Nyborg M.
Various measurements utilizing soils, plants, precipitation and free water surfaces indicate that approximately 7 to 9 kg/ha of sulphate S was deposited annually within an area of 4600 km('2). This area contained or had adjacent to its boundaries 10 S emission sources for which the provincial government had established a combined allowable daily emission of approximately 330 tonne S. At distance of 40 or more km from the emission sources the annual deposition rate had declined to 4 to 6 kg/ha.
显示更多 [+] 显示较少 [-]Effect of mean-cell residence time on organic composition of activated sludge effluents.
1981
Saunders F.M. | Dick R.I.
Role of ascorbic acid in the toxicity of pesticides in a fresh water teleost.
1981
Verma S.R. | Tonk I.P. | Gupta A.K. | Dalela R.C.
The effect of ascorbic acid and pesticides (thiotox and malathion) on certain haematological parameters of a fish Saccobranchus fossilis was studied. The sublethal concentrations of thiotox (0.002 mg/l) and of malathion (5.2 mg/l) were tested. Ascorbic acid (2 mg/100 g body weight) was given with food. The alterations in haematological parameters (CT, PT, Hb, RBC, WBC, ESR, PCV, MCH, MCHC, MCV, glucose, protein, total P, Na, K, Mg, Ca, and Cl) were measured after 15 and 30 days exposure. Thiotox and malathion induced significant alteration in blood parameters while ascorbic acid played a protective role.
显示更多 [+] 显示较少 [-]Environmental recovery in a marine ecosystem impacted by a sulfite process pulp mill.
1981
Cross S.F. | Ellis D.V.
Bioassays [for quantifying water pollution]: procedures and results.
1981
Maciorowski A.F. | Sims J.L. | Little L.W. | Gerrard E.D.
