خيارات البحث
النتائج 1 - 10 من 37
Petroleum biodegradation and oil spill bioremediation.
1995
Atlas R.M.
The effect of nitrogen fertilization on fungistatic phenolic compounds in roots of beech (Fagus sylvatica L.) and Norway spruce (Picea abies L. [Karst.])
2002
Tomova, L. | Braun, S. | Fluckiger, W. (Institute for Applied Plant Biology, Schonenbuch, (Switzerland))
The phenolic compounds showed different responses to fertilization. Fine roots of beech showed a significant decrease of (-) epicateching (84-99%) and pecatannol (78-98%) with nitrogen fertilization. Fine roots of fertilized Norway spruce showed decreased concentrations of 4-hydroxyacetophenone (33-48%), p-coumaric acid (44-64%), and pecatannol (36-61%). Concentration of p-hydroxybenzoic acid and protocatechuic acid were significantly higher in no fertilized roots. However in both tree species fertilization had no effect on vanillin and quercetin concentration in fine roots. It is suggested that roots of beech and Norway spruce are more susceptible to attacks of pathogens when they are exposed to impact of nitrogen
اظهر المزيد [+] اقل [-]Nitrogen leaching assessment under intensive agricultural practice
1993
Guimera, J. | Candela, L. (School of Civil Engineering, Polytechnic University of Catalonia, Barcelona (Spain))
[To much nitrogen, aci and ozone: pollutant immissions are over the critical threshold]. | Trop d'azote, d'acide et d'ozone: les immissions polluantes depassent le seuil critique.
1997
Voltz, R. | Baumgartner, H.
Health effects of chemical pollution: case-study in Algeria
2000
Marzouki, L. (Intitut Preparatoire aux Etudes d'Ingenieurs de Sfax (Tunisie)) | Ben Soltane, S. | Zghal, N. | Medhioub, K.
L'analyse de quelques parametres biologiques chez les ouvriers de l'usine d'engrais chimiques ASMIDAL (Algerie), ainsi que chez les habitants d'une cite avoisinante (El Bouni) exposes aux emanations de cette usine, a montre des modifications de ces parametres en signe de contamination par des derives azotes. L'exposition experimentale par ingestion a une dose infraletale de nitrate d'ammonium, derive fabrique par ASMIDAL, a provoque, chez le rat, des modifications similaires a celles trouvees chez les personnes etudiees. Les variations ont concerne les taux d'hemoglobine, de methemoglobine, les globules rouges, les nitrates seriques et urinaires. En outre, on a constate chez le rat des modifications de l'activite de la rate et du foie
اظهر المزيد [+] اقل [-]Nitrogen balances and leaching in four agricultural catchments in southeastern Norway
1998
Bechmann, M. | Eggestad, H.O. | Vagstad, N. (Jordforsk, Centre for Soil and Environmental Research, N-1432 As (Norway))
Residual effects of N fertilization on soil-water chemistry and ground vegetation in a Swedish Scots pine forest
1998
Nohrstedt, H.O. (SkogForsk, Uppsala Science Park, S-751 83 Uppsala (Sweden))
Mitigation of nitrous oxide emission from dairy farming systems
1998
Velthof, G.L. | Beusichem, M.L. van | Oenema, O. (Nutrient Management Institute NMI, Wageningen Agricultural University, P.O. Box 8005, 6700 EC Wageningen (Netherlands))
Environmental performance indicators for nitrogen
1998
Hanegraaf, M.C. (Centre for Agriculture and Environment, P.O. Box 10015, 3505 AA Utrecht (Netherlands))
Modelling the effects of nitrogen addition on soil nitrogen status and nitrogen uptake in a Norway spruce stand in Denmark
1998
Beier, C. | Eckersten, H. (RISO National Laboratory, P.O. Box 49, DK-4000 Roskilde (Denmark))
