Results 31 to 40 of about 78,844 (253)

The Consortium of Metabolomics Studies (COMETS): Metabolomics in 47 Prospective Cohort Studies.

open access: yesAmerican Journal of Epidemiology, 2019
The Consortium of Metabolomics Studies (COMETS) was established in 2014 to facilitate large-scale collaborative research on the human metabolome and its relationship with disease etiology, diagnosis, and prognosis.
Bing Yu   +73 more
semanticscholar   +1 more source

The burden of Galileo's controversy: the Jesuit revisiting of the Aristotelian cosmos in Collegio Romano (1618-1677)

open access: yesGalilæana, 2023
While studying the controversy between Galileo and the Jesuits over the comets of 1618, historians tend to focus on the works that led to the publication of Il Saggiatore in 1623.
Luís Miguel Carolino
doaj   +1 more source

The Astrophysical Formation of Asymmetric Molecules and the Emergence of a Chiral Bias

open access: yesLife, 2019
The biomolecular homochirality in living organisms has been investigated for decades, but its origin remains poorly understood. It has been shown that circular polarized light (CPL) and other energy sources are capable of inducing small enantiomeric ...
Adrien D. Garcia   +5 more
doaj   +1 more source

Isotopic ratios of H, C, N, O, and S in comets C/2012 F6 (Lemmon) and C/2014 Q2 (Lovejoy) [PDF]

open access: yes, 2016
The apparition of bright comets C/2012 F6 (Lemmon) and C/2014 Q2 (Lovejoy) in March-April 2013 and January 2015, combined with the improved observational capabilities of submillimeter facilities, offered an opportunity to carry out sensitive ...
N. Biver   +17 more
semanticscholar   +1 more source

CO2: A Small Ubiquitous Molecule With a Lot of Astrochemical Debate Attached

open access: yesFrontiers in Astronomy and Space Sciences, 2020
Water, carbon monoxide and carbon dioxide are the most abundant molecules in the condensed phase of interstellar dust grains. Water is formed by hydrogenation of oxygen species adsorbed on the surface of dust grains, while carbon monoxide is formed by ...
Jan Hendrik Bredehöft
doaj   +1 more source

Mechanical Properties of Cometary Surfaces

open access: yesUniverse, 2022
Mechanical properties, in particular, strength (tensile, shear, compressive) and porosity, are important parameters for understanding the evolution and activity of comets. However, they are notoriously difficult to measure.
Jens Biele   +2 more
doaj   +1 more source

Application of the regularization method to differential equations of comets' motion

open access: yesVestnik Samarskogo Gosudarstvennogo Tehničeskogo Universiteta. Seriâ: Fiziko-Matematičeskie Nauki, 2009
Regularization method for differential equation of comets' motion is used. Numerical integration of the equation of motion of 10 short-period comets during the period of 1800 to 2204 with the use of osculating elements of the large planets is done.
A. F. Zausaev, L. A. Solov'ev
doaj   +1 more source

Activity of Comets Constrains the Chemistry and Structure of the Protoplanetary Disk

open access: yesUniverse, 2022
Recent data of molecular clouds and protoplanetary disks constrain the composition and structure of the disk and planetesimals. Laboratory experiments suggest that dust accretion in disks stops at pebble sizes. Sublimation and recondensation of water ice
Marco Fulle
doaj   +1 more source

Neil Gehrels–Swift Observatory’s Ultraviolet/Optical Telescope Observations of Small Bodies in the Solar System

open access: yesUniverse, 2023
The Neil–Gehrels Swift Observatory has added extensively to our understanding of small bodies in our solar system through its capabilities to rapidly respond to short-live events such as outbursts and collisions, through its near-ultraviolet coverage ...
Dennis Bodewits   +3 more
doaj   +1 more source

Monte Carlo Models of Comet Dust Tails Observed from the Ground

open access: yesUniverse, 2022
Dust particles leaving the comet nucleus surface are entrained by the gas within the first few nuclear radius distances and are subjected to a complex hydrodynamical environment.
Fernando Moreno
doaj   +1 more source

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