Earth

Description de l'item "Terre"

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The climate in ice

Where are the climate archives ? In the ice ! During the first Ice Memory expeditions, international scientists extracted five ice cores from the world's highest glaciers containing gases and aerosols that have been trapped for thousands of years. Two of them will be analysed in Grenoble, in the...

The Challenges of the Sub-Saharan Urban Explosion

Sub-Saharan African cities are presently growing at a size and speed unprecedented in human history. This region of the continent, which was always very rural up to now, is becoming predominantly urban. Small, medium-sized and large cities are doubling in size year on year, with some growing by 1...
falaise-de-glace_glacier-noir

The Achilles heel of Asia’s black glaciers

Why do Asian glaciers melt more slowly than others? Glaciologists are working on this phenomenon, focusing in particular on the many “black glaciers” in the region, covered in moraine debris. They reveal some of their specific characteristics and vulnerabilities.
Root nodules of Discaria (Order: Rosales), a non-legume species capable of nitrogen-fixing symbiosis.

Nitrogen-fixing symbioses reveal themselves

Recent research has revealed the origin and evolution of symbiotic relationships between certain plants and soil bacteria in order to use atmospheric nitrogen. This knowledge could ultimately contribute to the development of sustainable agriculture minimising the use of chemical fertilisers.
Water run-off on degraded soil and gully erosion due to flooding, in the Mélé Haoussa basin in Niger

New hydroclimatic conditions in the Sahel

The latest figures on soil and climate help explain the enigmatic ups and downs observed in Sahelian hydrology for decades. Knowledge of the mechanisms involved paves the way for practical solutions to adapt agriculture to new environmental conditions.
pollution-par-les-plastiques

Plastic in the Saigon River

While the plastic pollution of the oceans is widely covered in the media, freshwater pollution has a lower profile. For the first time, a recent study highlights the high level of micro and macro-plastic pollution of a tropical river running through a developing megalopolis.
Cowpea roots bear nodules which contain nitrogen-fixing bacteria.

Lipids that boost symbiosis

Certain legumes form a symbiotic relationship with bacteria! Tucked into their roots, these bacteria increase the crop yield of these plants. These bacteria, capable of producing lipid molecules known as hopanoids, therefore seem to provide a distinct advantage.