Greening seems to have increased during the 1980s and 1990s in the northern hemisphere from the arctic regions down to the 35th parallel of latitude (roughly southern Europe). This has been shown by measurements from space satellites. Some observers, however, have doubted the reliability of these measurements. In the latest issue of Science, a research team from the Institute for Climatic Impacts Research in Potsdam, the Max Planck Institute for Biogeochemistry in Jena, and Lund University presents new findings that support the satellite observations.
The research team has fed in the current values for temperature, precipitation, solar radiation, cloud cover, and carbon dioxide content during the period 1982-1998 in a model for vegetation growth. It is called the LPJ Model and was developed at Lund by Colin Prentice, Stephen Sitch, and Ben Smith. Of the three, the former two are now in Jena, whereas ecologist Benjamin Smith is associated with the Department of Physical Geography and Ecosystem Analysis at Lund University in Sweden.
Vegetation has been measured from space using AVHRR, Advanced Very High Resolution Radiometry. This is a spectroscopic method that can register when light reflects from the surface of green leaves.
Göran Frankel | alphagalileo
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DNA molecules that follow specific instructions could offer more precise molecular control of synthetic chemical systems, a discovery that opens the door for engineers to create molecular machines with new and complex behaviors.
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MPQ scientists achieve long storage times for photonic quantum bits which break the lower bound for direct teleportation in a global quantum network.
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Tiny pores at a cell's entryway act as miniature bouncers, letting in some electrically charged atoms--ions--but blocking others. Operating as exquisitely sensitive filters, these "ion channels" play a critical role in biological functions such as muscle contraction and the firing of brain cells.
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The miniaturization of the current technology of storage media is hindered by fundamental limits of quantum mechanics. A new approach consists in using so-called spin-crossover molecules as the smallest possible storage unit. Similar to normal hard drives, these special molecules can save information via their magnetic state. A research team from Kiel University has now managed to successfully place a new class of spin-crossover molecules onto a surface and to improve the molecule’s storage capacity. The storage density of conventional hard drives could therefore theoretically be increased by more than one hundred fold. The study has been published in the scientific journal Nano Letters.
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