In a previous paper (l), we reported on the incorporation of the methylene carbon of glycine in carotene in Phycomyces blakesleeanus and presented data suggesting that 8-aminolevulinic acid (ALA) had an effect similar to leucine in stimulating carotene production. We now present supplementary evidence on the correctness of the data dealing with labeled glycine by completing a carbon balance wit...

1 Earth and Biosphere Institute, School of Geography, University of Leeds, Leeds, LS2 9JT, UK 2 Max-Planck-Institut für Biogeochemie, Postfach 100164, 07701 Jena, Germany 3 Departamento de Ciências Atmosféricas, Instituto de Astronomia Geof́ısica e Ciências Atmosféricas, Univ. de São Paulo, Rua do Matão, 1226, 05508-900, São Paulo, SP, Brazil 4 Centro de Previsão do Tempo e Estudos Climaticos, I...

........................................................................................................................ I SAMMANFATTNING................................................................................................... III PREFACE ........................................................................................................................... V LIST OF PAPERS ..........

The climate system is warming, and a key factor in this change of the climate system is the increase of atmospheric concentrations of greenhouse gasses, which alter the balance of incoming and outgoing energy at the surface (Solomon et al., 2007). The most important anthropogenic greenhouse gas is carbon dioxide (CO2) and the uptake of carbon by the biosphere is a substantial component affectin...

Many projections of the soil carbon sink or source are based on kinetically defined carbon pool models. Parameters of these models are often determined in a way that the steady state of the model matches observed carbon stocks. The underlying simplifying assumption is that observed carbon stocks are near equilibrium. This assumption is challenged by observations of very old soils that do still ...

Introduction Conclusions References

Extreme climatic events and land-use change are known to influence strongly the current carbon cycle of Amazonia, and have the potential to cause significant global climate impacts. This review intends to evaluate the effects of both climate and anthropogenic perturbations on the carbon balance of the Brazilian Amazon and to understand how they interact with each other. By analysing the outputs...

Mitochondria generate high levels of reactive oxygen species (ROS) to activate protumorigenic signaling pathways. In parallel, the mitochondria must also increase their antioxidant capacity to lower ROS levels and prevent cancer cell death. In this issue of Cancer Discovery, Ye and colleagues demonstrate that serine catabolism through one-carbon metabolism within the mitochondrial matrix is nec...

Global awareness of the significance of the role that tropical forests play in the global carbon cycle has never been greater, but much uncertainty still exists as to the exact magnitude of this role. Here I review and attempt to synthesise the latest evidence of both the carbon source from tropical forest conversion, and the carbon sink in tropical vegetation. Tropical biome conversion is esti...