摘要:

Erythrocytes of both G‐6‐PD deficient humans and Dorset sheep, an animal model with an erythrocyte G‐6‐PD deficiency, both responded in a dose‐dependent manner to the oxidant stress of MLHP as measured by decreases in G‐6‐PD activity, increases in METHB levels and decreases in GSH. However, the human G‐6‐PD deficient erythrocytes were considerably more sensitive to the formation of METHB than the sheep erythrocytes while the reverse was the case for the GSH parameter. The results suggest a qualitative difference in the response of sheep erythrocytes and human G‐6‐PD deficient erythrocytes to MLHP that seriously questions the value of the sheep erythrocyte as a quantitatively accurate predictive model.

ISSN:0360-1226    

DOI:10.1080/10934528309375088

出版商:Taylor & Francis Group    

年代:1983

数据来源: Taylor

摘要:

Preliminary experiments indicate that waterhyacinths and a water‐fern (Azoilasp.) show enhanced growth in CO2‐enriched atmospheres. Waterhyacinths were subjected to a range of nutrient conditions, and plants exposed to an enhanced CO2‐atmosphere showed weight gains under all conditions; control plants lost weight at low and medium nutrient enrichments.Azolla, a plant that is sensitive to light intensity, was subjected to a range of light conditions. Plants exposed to ambient conditions lost weight under medium and high light intensity and gained weight under low light intensity conditions. In contrast,Azollain CO2‐enriched atmospheres had increasing weight gains under all light conditions studied.

ISSN:0360-1226    

DOI:10.1080/10934528309375089

出版商:Taylor & Francis Group    

年代:1983

数据来源: Taylor

摘要:

Evidence is presented that a naturally occurring hydrilla‐growth inhibitor also inhibits the germination of lettuce seeds. The effect is concentration dependent, and the development of both hypocotyledons and dicotyledons is retarded, though no morphological changes are noted in comparison with control samples. In addition, a photodynamic action is involved: the number of seeds developing cotyledons and hypocotyledons in a given time is significantly reduced in the samples exposed to light and the growth inhibitor in comparison to control samples exposed to inhibitor, but maintained in the dark. From experiments with sodium azide, it seems probable that the observed photodynamic action is mediated by singlet oxygen (O21Δg).

ISSN:0360-1226    

DOI:10.1080/10934528309375090

出版商:Taylor & Francis Group    

年代:1983

数据来源: Taylor

摘要:

Erythrocytes of both normal and G‐6‐PD deficient humans responded in a dose‐dependent manner to the oxidant stress of MLHP as measured by decreases in G‐6‐PD activity, increases in methemoglobin (METHB) levels and decreases in reduced glutathione (GSH). The G‐6‐PD deficient eryth‐rocytes displayed a markedly enhanced sensitivity to MLPH induced decreases in G‐6‐PD activity and METHB increases while being less sensitive than normalerythrocytes to changes in GSH levels.

ISSN:0360-1226    

DOI:10.1080/10934528309375091

出版商:Taylor & Francis Group    

年代:1983

数据来源: Taylor

摘要:

The inactivation of bacterial spores suspended in air flowing through a microwave plasma reactor has been found to be nearly complete for single naked spore aerosols but less effective for heterogeneous aerosols of spore aggregates. This preliminary study demonstrates the viability of using ionized gases for decontamination.

ISSN:0360-1226    

DOI:10.1080/10934528309375092

出版商:Taylor & Francis Group    

年代:1983

数据来源: Taylor

摘要:

The gas chromatographic technique was used for the study of hydrocarbons, i.e., n‐alkanes(C6‐C17), 1‐alkenes (C5‐C10), and aromatics (benzene and monosubstituted n‐alkyl(C1‐C10) benzenes) adsorbed on soils. The adsorption by the soil increased as the number of carbon atoms in the homologous series increased and the adsorption order among the three different series of hydrocarbons(when compared among their same number of carbon atoms) was aromatic>1‐alkene> n‐alkane

ISSN:0360-1226    

DOI:10.1080/10934528309375093

出版商:Taylor & Francis Group    

年代:1983

数据来源: Taylor

摘要:

Exposure of male Sprague‐Dawley rats to 0.3 ppm ozone for 3 hours resulted in a time‐delayed increase in serum and hepatic reduced ascorbic acid levels as compared to controls (0.0 ppm O3) which exhibited an immediate increase in hepatic and serum ascorbic levels. After 24 hours ascorbic acid levels in both groups approached but did not return to pre‐exposure values. The immediate increase in ascorbic acid levels in the controls was unexpected and may reflect previously unrecognized chamber and/or handling effects.

ISSN:0360-1226    

DOI:10.1080/10934528309375094

出版商:Taylor & Francis Group    

年代:1983

数据来源: Taylor

摘要:

A feasibility study was conducted for the removal of cadmium, copper, lead, and zinc from water by a commercial grade of calcite (CaCO3(S)). The latter is commonly used for treatment of domestic well waters that are acidic due to excessive quantities of CO2(g).Equilibrium and column studies were conducted for the adsorption of the four metals on calcite.

ISSN:0360-1226    

DOI:10.1080/10934528309375095

出版商:Taylor & Francis Group    

年代:1983

数据来源: Taylor

摘要:

A stochastic, model for representing particle fall velocity distribution for suspended sediments was developed and successfully applied to a variety of natural and synthesized suspensions. Flocculation effects are accounted for in the model by distribution. parameters. Additionally, the model eliminates time as an independent variable, thus permitting use of steady‐state equations for quasi‐time variable analyses.

ISSN:0360-1226    

DOI:10.1080/10934528309375096

出版商:Taylor & Francis Group    

年代:1983

数据来源: Taylor

摘要:

Physiochemical pretreatment of landfill leachate using coagulation was examined and found to be an effective means of reducing turbidity, suspended solids, metals and dispersed oil. Lime was found to be the most effective pretreatment coagulant for treating the landfill leachate examined in this study. A 6.0 g/1 dosage resulted in 98% reduction in turbidity. Reductions in dispersed oil were substantial and were accompanied by small removals of dissolved organic matter. Additionally, many heavy metal species were successfully removed. Polyelectrolyte coagulant aids were found to be useful in increasing the rate of turbidity reduction. Re‐carbonation is suggested, to lower the pH to a range desirable for successive treatment processes.

ISSN:0360-1226    

DOI:10.1080/10934528309375097

出版商:Taylor & Francis Group    

年代:1983

数据来源: Taylor