We investigate the possibility that dark energy does not couple to gravitation in the same way as ordinary matter, yielding a violation of the weak and strong equivalence principles on cosmological scales. We build a transient mechanism in which gravitation is pushed away from general relativity by a Born-Infeld gauge interaction acting as an abnormally weighting (dark) energy. This mechanism a...

Large amounts of 5-hydroxytryptamine (5-HT) in the mammalian duodenum are found mainly in the enterochromaffin cells. Baker (1) was the first to demonstrate that in the enterochromaffin cells of the dog's duodenal mucosa, 5-HT was stored in large granules which were sedimented in the gravitational field used for the sedimentation of mitochondria. By further equilibrium centrifugation in a sucro...

Microwell arrays have emerged as robust and versatile alternatives to conventional mammalian cell culture substrates. Using standard microfabrication processes, biomaterials surfaces can be topographically patterned to comprise high-density arrays of micron-sized cavities with desirable geometry. Hundreds to thousands of individual cells or cell colonies with controlled size and shape can be tr...

Many motile microorganisms adjust their swimming motion relative to the gravitational field and thus counteract sedimentation to the ground. This gravitactic behaviour is often the result of an inhomogeneous mass distribution, which aligns the microorganism similar to a buoy. However, it has been suggested that gravitaxis can also result from a geometric fore-rear asymmetry, typical for many se...

Sedimentation of the neutron rich isotope 22Ne may be an important source of gravitational energy during the cooling of white dwarf stars. This depends on the diffusion constant for 22Ne in strongly coupled plasma mixtures. We calculate self-diffusion constants D(i) from molecular dynamics simulations of carbon, oxygen, and neon mixtures. We find that D(i) in a mixture does not differ greatly f...

MARSBOX is a recently developed microphysical model for Martian ice clouds based on the state-ofthe-art model for terrestrial Polar Stratospheric Clouds PSCbox [2, 3]. Two types of particles are considered: dust particles and dust coated with ice (ice particles), with, for both, a size-resolved distribution discretized in geometrically increasing size bins. We here run the model with 30 bins. T...

Collective excitations of rotating dusty plasma are analyzed under the quasi-localized charge approximation (QLCA) framework for strongly coupled systems by explicitly accounting dust rotation in analysis. Considering firm analogy magnetoplasmons with “rotoplasmons” established recent experiments, relaxation introduced their strong coupling and two-dimensional (often gravitational sedimentation...

The deposition of aerosol in the lung is an important issue regardless of whether the aerosol results from airborne pollutants or aerosol therapy. The specific pattern of deposition of airborne pollutants is a determinant in the development of pulmonary diseases since this pattern determines the local doses in the airspaces and the subsequent redistribution and clearance of the deposited partic...

The manuscript "Modeling the dynamical sinking of biologenic particles in oceanic flow" presents an interesting study of particle sedimentation in realistic oceanic flows. In particular, it focuses in a simplified dynamics accounting for gravitational settling and also scrutinizes the effect of additional terms such as that due to Coriolis force (accounting for rotation) and inertial terms. The...

Fly ash has been regarded as hazardous because of its high adsorption of toxic organic and/or inorganic pollutants. Fly ash is also known to have broad distributions of different chemical and physical properties, such as size and density. In this study, fly ash emitted from a solid waste incinerator was pre-fractionated into six sub-populations by use of gravitational SPLITT fractionation (GSF)...