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Seismic images of Earth’s interior have revealed two continent-sized anomalies with low seismic velocities, known as the large low-velocity provinces (LLVPs), in the lowermost mantle1. The LLVPs are often interpreted as intrinsically dense heterogeneities that are compositionally distinct from the surrounding mantle2. Here we show that LLVPs may represent buried relics of Theia mantle material (TMM) that was preserved in proto-Earth’s mantle after the Moon-forming giant impact3. Our canonical giant-impact simulations show that a fraction of Theia’s mantle could have been delivered to proto-Earth’s solid lower mantle. We find that TMM is intrinsically 2.0–3.5% denser than proto-Earth’s mantle based on models of Theia’s mantle and the observed higher FeO content of the Moon. Our mantle convection models show that dense TMM blobs with a size of tens of kilometres after the impact can later sink and accumulate into LLVP-like thermochemical piles at ....
Proteins and nucleic acids can phase-separate in the cell to form concentrated biomolecular condensates1–4. The functions of condensates span many length scales: they modulate interactions and chemical reactions at the molecular scale5, organize biochemical processes at the mesoscale6 and compartmentalize cells4. Understanding the underlying mechanisms of these processes will require detailed knowledge of the rich dynamics across these scales7. The mesoscopic dynamics of biomolecular condensates have been extensively characterized8, but their behaviour at the molecular scale has remained more elusive. Here, as an example of biomolecular phase separation, we study complex coacervates of two highly and oppositely charged disordered human proteins9. Their dense phase is 1,000 times more concentrated than the dilute phase, and the resulting percolated interaction network10 leads to a bulk viscosity 300 times greater than that of water. However, single-molec ....
The complexities of the human placenta scitation.org - get the latest breaking news, showbiz & celebrity photos, sport news & rumours, viral videos and top stories from scitation.org Daily Mail and Mail on Sunday newspapers.
Clogging: The self-sabotage of suspensions scitation.org - get the latest breaking news, showbiz & celebrity photos, sport news & rumours, viral videos and top stories from scitation.org Daily Mail and Mail on Sunday newspapers.
Mushy-layer convection scitation.org - get the latest breaking news, showbiz & celebrity photos, sport news & rumours, viral videos and top stories from scitation.org Daily Mail and Mail on Sunday newspapers.