The method that has been used for the last twenty years to measure the production of laughing gas (nitrous oxide) from different natural sources is not working. Due to this, the size of some of the sources of this greenhouse gas has locally probably been underestimated. This conclusion is drawn by Nicole Wrage in her PhD thesis that she is going to defend at Wageningen University (Netherlands) on February 28.
The research of the PhD student at Wageningen University focussed on the production of laughing gas (N2O) in fertilized soil. This greenhouse gas is produced by different groups of soil bacteria. These bacteria convert ammonia to nitrate (nitrification) or they use nitrate (a soil compound containing nitrogen) to make nitrogen gas (denitrification). During these processes, laughing gas can be produced. To investigate along which biochemical way the laughing gas is produced, researchers have used since 1979 a relatively simple method based on the separation of some soil (incubation). To different incubations, some (0.02 %) acetylene gas, a lot of (100 %) oxygen or a combination of both gases is added. The acetylene is supposed to stop nitrification, whereas oxygen should inhibit the denitrification processes.
According to the study, this method does not work for all bacteria. Thus, the addition of acetylene gas did inhibit the production of laughing gas by the bacterium Nitrosomonas europaea. The bacterium Nitrosospira briensis, however, known from agricultural soils, was not influenced. According to the researcher Nicole Wrage, acetylene probably inhibits only some of the nitrifying bacteria in the soil. Oxygen, which should only stop denitrification processes in the incubations, was found to also inhibit part of nitrification. Due to these problems of the method, it is likely that nitrifying bacteria are an underestimated source of laughing gas.
Jac Niessen | alfa
Kakao in Monokultur verträgt Trockenheit besser als Kakao in Mischsystemen
18.09.2017 | Georg-August-Universität Göttingen
Ultrasound sensors make forage harvesters more reliable
28.08.2017 | Fraunhofer-Institut für Zerstörungsfreie Prüfverfahren IZFP
Using ultrafast flashes of laser and x-ray radiation, scientists at the Max Planck Institute of Quantum Optics (Garching, Germany) took snapshots of the briefest electron motion inside a solid material to date. The electron motion lasted only 750 billionths of the billionth of a second before it fainted, setting a new record of human capability to capture ultrafast processes inside solids!
When x-rays shine onto solid materials or large molecules, an electron is pushed away from its original place near the nucleus of the atom, leaving a hole...
For the first time, physicists have successfully imaged spiral magnetic ordering in a multiferroic material. These materials are considered highly promising candidates for future data storage media. The researchers were able to prove their findings using unique quantum sensors that were developed at Basel University and that can analyze electromagnetic fields on the nanometer scale. The results – obtained by scientists from the University of Basel’s Department of Physics, the Swiss Nanoscience Institute, the University of Montpellier and several laboratories from University Paris-Saclay – were recently published in the journal Nature.
Multiferroics are materials that simultaneously react to electric and magnetic fields. These two properties are rarely found together, and their combined...
MBM ScienceBridge GmbH successfully negotiated a license agreement between University Medical Center Göttingen (UMG) and the biotech company Tissue Systems Holding GmbH about commercial use of a multi-well tissue plate for automated and reliable tissue engineering & drug testing.
MBM ScienceBridge GmbH successfully negotiated a license agreement between University Medical Center Göttingen (UMG) and the biotech company Tissue Systems...
Pathogenic bacteria are becoming resistant to common antibiotics to an ever increasing degree. One of the most difficult germs is Pseudomonas aeruginosa, a...
Scientists from the MPI for Chemical Energy Conversion report in the first issue of the new journal JOULE.
Cell Press has just released the first issue of Joule, a new journal dedicated to sustainable energy research. In this issue James Birrell, Olaf Rüdiger,...
19.09.2017 | Event News
12.09.2017 | Event News
06.09.2017 | Event News
19.09.2017 | Event News
19.09.2017 | Physics and Astronomy
19.09.2017 | Power and Electrical Engineering