خيارات البحث
النتائج 351 - 360 من 373
The suitability of gastropods as biomarkers : Induction of ethoxy-, pentoxy- and benzoxyresorufin-O-dealkylase in limnetic gastropods via aroclor 1254 النص الكامل
1997
Meimberg, Harald | Schrenk, Christiane | Steinberg, Christian | Klarenberg, Albert | Kettrup, A. A.
The measurement and induction of mixed function oxyigenases (MFOs) of limnetic gastropods were investigated to estimate their suitability as biomarkers. A determination of MFO activities was performed through the measurement of ethoxyresorufin-O-dealkylase (EROD), pentoxy-(PROD) and benzoxyresorufin-O-dealkylase-activity (BROD). Optimal measuring conditions of these activities were investigated in preparations of the digestive gland of 4 species of limnetic gastropods. Results indicate that MFO-activity inhibiting substances are accumulating in the microsomal pellet, the fraction commonly used for the measurement of MFO-activities. Therefore, the fraction used for induction studies was the postmitochondrial supernatant (PMS). EROD, PROD, and BROD activity ofPlanorbis planorbis andPlanorbis carinatus were measured after a treatment with Aroclor 1254 for 1–17 days. Maximal induction of EROD and PROD were 6 and 10 times the value in the control group ofP. carinatus, respectively induction inP. planorbis was lower. BROD-activity could not been measured inP. planorbis. InP. carinatus, BROD-activity increased to a maximum of 2 times after traetment with Aroclor 1254. The level of induction of EROD-activity is comparable to results described in analog studies with fish.
اظهر المزيد [+] اقل [-]Embodied pollution and trade: a two-country general equilibrium model النص الكامل
1997
Diao, Xinshen | Roe, Terry L.
Embodied pollution and trade: a two-country general equilibrium model النص الكامل
1997
Diao, Xinshen | Roe, Terry L.
The effects of environmental policy on trade and social welfare are analyzed in a modified Heckscher-Ohlin framework where pollution is embodied in a good consumed. Utility is non-homothetic to account for changes in the demand for healthy goods when income increases. If the polluting input is used intensively, taxing it alone can cause an increase in the good's level of pollution concentration. Instead, a tax on the polluting input in combination with a subsidy to the non-polluting input can result in Pareto improvement. Contrary to other approaches, an abatement policy does not necessarily have a negative effect on a country's comparative advantage. However, if the country is large, change in terms of trade may cause one country to be made better off at the expense of the other, which suggests that compensatory payments may be required to encourage abatement policies.
اظهر المزيد [+] اقل [-]Embodied pollution and trade: a two-country general equilibrium model النص الكامل
1997 | 2012
Diao, Xinshen; Roe, Terry L. | http://orcid.org/0000-0003-4843-1670 Diao, Xinshen;
The effects of environmental policy on trade and social welfare are analyzed in a modified Heckscher-Ohlin framework where pollution is embodied in a good consumed. Utility is non-homothetic to account for changes in the demand for healthy goods when income increases. If the polluting input is used intensively, taxing it alone can cause an increase in the good's level of pollution concentration. Instead, a tax on the polluting input in combination with a subsidy to the non-polluting input can result in Pareto improvement. Contrary to other approaches, an abatement policy does not necessarily have a negative effect on a country's comparative advantage. However, if the country is large, change in terms of trade may cause one country to be made better off at the expense of the other, which suggests that compensatory payments may be required to encourage abatement policies." -- Authors' Abstract | PR | IFPRI3 | TMD
اظهر المزيد [+] اقل [-]Analyzing nonpoint source water pollution problems
1997
Favero, Philip
Pollution prevention in the paints and coatings industry
1997
Joseph, Ron
The description, assessment and meaning of vertical fluxes of matter within ecotypes - a systematic consideration النص الكامل
1997
Dämmgen, Ulrich | Grünhage, Ludger | Jäger, Hans-Jürgen
The interactions between sediments and water
1997
Evans, R. Douglas | Wisniewski, Joe | Wisniewski, Jan R.
Water pollution IV
1997
Rajar, R (Rudi) | Brebbia, C. A.
Himalayan microbial diversity
1997
Sati, S. C. | Saxena, J. (Jitendra) | Dubey, R. C.
A survey of Cryptomeria japonica and Chamaecyparis obtusa pollen counts in Nagano city [Japan]
1997
Yamagishi, T. (Nagano-ken. Research Inst. for Health and Pollution (Japan))
Behavior of air pollutants in forest: Photochemical reactions of natural and anthropogenic organics
1997
Satsumabayashi, H. (Nagano-ken. Research Inst. for Health and Pollution (Japan)) | Sasaki, K. | Yokouchi, Y. | Ueda, H.
