Mimétisme chez les phasmes du Crétacé inférieur

Des scientifiques d’une équipe internationale et pluridisciplinaire, dont Olivier Béthoux du Centre de recherche sur la paléobiodiversité et les paléoenvironnements (Muséum national d’Histoire naturelle/CNRS/UPMC), ont déterminé que des phasmes avaient développé dès le Crétacé inférieur la capacité d’imiter des plantes de leur environnement. Cette découverte, fondée sur l’étude d’une nouvelle espèce d’insecte fossile trouvée en Chine, est publiée aujourd’hui dans

Actu-sciences

Découverte de « ringwoodite » dans un diamant

Le centre de la Terre « pourrait renfermer autant d’eau que tous les océans réunis », révèle l’analyse d’un petit diamant venu des profondeurs de la Terre, publiée mercredi dans Nature. « Une des raisons pour laquelle la Terre est une planète aussi dynamique est la présence d’eau à l’intérieur », explique l’un des auteurs de l’étude, Graham Pearson, de l’Université d’Alberta (Canada). Cette

Actu-sciences

Ce virus a 30 000 ans

Découvert dans le sol sibérien un virus géant vieux de 30.000 ans a été réactivé par une équipe de chercheurs franco-russe. (…) Et ce virus contemporain de l’extinction de l’homme de Néandertal est un colosse : 15 fois plus gros que le virus de la grippe, il est si gigantesque (1,5 microns de long pour 0,5 de diamètre) que les

Actu-sciences

Connaissez-vous l’ADN sédimentaire ?

Grâce à l’ADN piégé dans les sédiments lacustres, des chercheurs du laboratoire Environnement, dynamique et territoires de la montagne – EDYTEM (CNRS / Université de Savoie / Ministère de la culture et de la communication) et du laboratoire d’Ecologie alpine – LECA (CNRS / Université de Savoie / Université Joseph Fourier) ont pu confirmer la présence de troupeaux autour du

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