Results 61 to 70 of about 25,279 (299)
Frontiers in Physics, 2020 In this work, we present results that simultaneously constrain the dust size distribution, dust-to-gas ratio, fraction of dust re-deposition, and total mass production rates for comet 67P/Churyumov-Gerasimenko.
Raphael Marschall +7 more
doaj +1 more source
Comets, carbonaceous chondrites, and interstellar clouds: Condensation of carbon [PDF]
, 1979 Comets, carbonaceous chondrites, and interstellar clouds are discussed in relation to information on interstellar dust. The formation and presence of carbon in stars, comets, and meteorites is investigated.
Field, G. B.
core
Fabry's Comet and Barnard's Comet [PDF]
Nature, 1886 NOT having seen any mention of the rapid apparent growth of the tail of Fabry's comet, probably some of your readers are not aware to how great a length it extended. On April 26 occurred the first fine night after a very unusual series of overcast ones, and about 14h. G.M.T. I was surprised to see the tail reaching up to, or at least to within 1° of δ,
openaire +2 more sources
Advanced Science, EarlyView.DDX21 suppresses MK2 activation by directly inhibiting Thr334 phosphorylation in a p38‐independent manner, thereby impairing DNA damage response. Clinically, patients with well‐differentiated tumors exhibiting high DDX21 expression are more likely to benefit from adjuvant radiotherapy, whereas those with low DDX21 levels are predisposed to ...
Tianru Yang +8 more
wiley +1 more source
Some Studies of Terrestrial Impact Cratering Rate
Open Astronomy, 2011 In 1984, a 28.4 Myr periodicity was detected in the ages of terrestrial impact craters and a 26 Myr periodicity in the epochs of mass extinctions of species.
Jetsu L.
doaj +1 more source
Spectrophotometry of faint comets: The asteroid approach [PDF]
, 1981 Observing programs at optical (0.35-0.8 micron) and near-infrared (1.1-2.4 micron) wavelengths, directed at the acquisition of reflection spectra of faint and distant comets, are described.
Degewij, J.
core
Advanced Science, EarlyView.Chemical switching of OGG1 by CMM‐98 accelerates oxidative DNA damage repair and enhances hepatocyte resilience during acetaminophen‐induced acute liver injury. By promoting efficient processing of OGG1‐generated repair intermediates, CMM‐98 reduces oxidative damage, preserves cellular integrity, and protects against acute liver failure, identifying ...
Zhenjun Zhao +25 more
wiley +1 more source
Nongravitational forces on comets [PDF]
, 1976 Methods are presented and discussed for determining the effects of nongravitational forces on the orbits of comets. These methods are applied to short-period and long-period comets.
Marsden, B. G.
core
, 2014 International audienceRemote imaging polarimetric observations is an invaluable tool to provide information on the physical properties of dust in comets.
Hadamcik, Edith +4 more
core +4 more sources
Excitation‐Selective Hydrochromic Upconversion in Zero‐Dimensional Metal Halides
Advanced Science, EarlyView.Excitation wavelength dictates whether moisture speaks. In zero‐dimensional metal halides, the same humidity leaves the upconversion emission unchanged under 980 nm excitation yet triggers a distinct green‐to‐red shift under 1550 nm. This excitation‐selective hydrochromism, governed by the absorption at each wavelength, enables stimulus‐dependent ...
Joo Hyeong Han +6 more
wiley +1 more source