In the current issue of the Journal of the International Society for Microbial Ecology (ISME Journal, 20.1.2014) scientists from the University of Oldenburg and from the GFZ German Centre for Geosciences show that in deep, old and nutrient-poor marine sediments there are up to 225 times more viruses than microbes.
The scientists found that with decreasing nutrient levels the ratio between viruses and cells shifts more toward viruses.
“For several years it has been know that the biomass of all microbes within the sea floor equals that of all life in the oceans above” reports Jens Kallmeyer from the GFZ. “Viruses, however, have been neglected previously”.
In these extreme environments viruses take over the role of predatory organisms: They control size and composition of the microbial community. The surprisingly high number of viruses can be explained by the fact that the small but active microbial community permanently produces new viruses that remain in the sediment for longer times because the few microbes produce fewer enzymes that can destroy viruses.Previous measurements in seawater and surficial sediments showed that viruses are about ten times more abundant than microbes, but because of their much smaller biomass they did not play a major role in estimates of the total living biomass. Moreover, it was assumed that predators such as unicellular organisms, but also worms and snails control the size of the microbial population. The new results show that these simple assumptions are no longer valid.
Franz Ossing | GFZ Potsdam
The herbivore dilemma: How corn plants fights off simultaneous attacks
09.02.2016 | Boyce Thompson Institute for Plant Research
Shedding Light on Bacteria
09.02.2016 | Albert-Ludwigs-Universität Freiburg im Breisgau
Researchers at King’s College London and the Wellcome Trust Sanger Institute in the United Kingdom have for the first time demonstrated a direct link between the Wbp2 gene and progressive hearing loss. The scientists report that the loss of Wbp2 expression leads to progressive high-frequency hearing loss in mouse as well as in two clinical cases of children with deafness with no other obvious features. The results are published in EMBO Molecular Medicine.
The scientists have shown that hearing impairment is linked to hormonal signalling rather than to hair cell degeneration. Wbp2 is known as a transcriptional...
Pollens, the bane of allergy sufferers, could represent a boon for battery makers: Recent research has suggested their potential use as anodes in lithium-ion batteries.
"Our findings have demonstrated that renewable pollens could produce carbon architectures for anode applications in energy storage devices," said Vilas Pol, an...
Automobiles increase the mobility of their users. However, their maneuverability is pushed to the limit by cramped inner city conditions. Those who need to...
Advance in biomedical imaging: The University of Würzburg's Biocenter has enhanced fluorescence microscopy to label and visualise up to nine different cell structures simultaneously.
Fluorescence microscopy allows researchers to visualise biomolecules in cells. They label the molecules using fluorescent probes, excite them with light and...
NASA's follow-on to the successful ICESat mission will employ a never-before-flown technique for determining the topography of ice sheets and the thickness of sea ice, but that won't be the only first for this mission.
Slated for launch in 2018, NASA's Ice, Cloud and land Elevation Satellite-2 (ICESat-2) also will carry a 3-D printed part made of polyetherketoneketone (PEKK),...
02.02.2016 | Event News
26.01.2016 | Event News
26.01.2016 | Event News
09.02.2016 | Earth Sciences
09.02.2016 | Life Sciences
09.02.2016 | Ecology, The Environment and Conservation