Energy balance of different organic biogas farming systems

The ecological impact of biogas plants depends on their integration into a given farming system. Therefore only farm-specific and no general statements are possible. In this paper, two different concepts of biogas production for an organic cash crop farm have been energetically balanced using a model software. The analysis of input and efficient use of fossil energy carriers provides information on the environmental relevance of the farm operations. Apart from this, renewable energy production in the farming systems is compared to food production, and changes in the farm output are described. It turns out that organically run cash crop farms can benefit from a reasonable integration of a biogas plant, both in food crop and energy production. An increased orientation on the growing of energy crops, however, leads to worse utilization of fossil energy carriers and reduced food production

Langzeituntersuchung der Kohlenstoff- und Stickstoffkreisläufe eines intensiven ökologischen Betriebssystems – am Beispiel des Versuchsgutes Scheyern

Carbon, nitrogen and energy flows are considered as an appropriate basis to characterize farming systems and to evaluate the environmental effects. Using the model REPRO the carbon and nitrogen flows of the experimental farm “Klostergut Scheyern” have been evaluated since 1991 on the basis of complete cultivation data as well as with the help of detailed site and weather data. Thus “Scheyern” is characterised as an intensive organic farming system with a high turnover of C and N

Stem cells for the treatment of stroke: malignant transformation of homologous transplants

Copyright 2002 Springer-Verlag Berlin Heidelber

Stem cell implantation in ischemic mouse heart: a high-resolution magnetic resonance imaging investigation

© 2005 Wiley-Liss, Inc. All rights reserved

Stem cells for the treatment of stroke: malignant transformation of homologous transplants

Copyright 2002 Springer-Verlag Berlin Heidelber

Host-dependent tumorigenesis of embryonic stem cell transplantation in experimental stroke

© 2003 The International Society for Cerebral Blood Flow and Metabolis