Results 211 to 220 of about 33,036 (248)

DNA damage in oral mucosal epithelial cells cultured in complex and xenobiotic-free media: a comparison study. [PDF]

Mutagenesis
Cabral JV, Vodenkova S, Tomasova K, Vodickova L, El Yamani N, Rundén Pran E, Dusinska M, Safanda A, Jirsova K.   +8 more
europepmc   +1 more source

Immunitas magistra vitae : The time has come to replace humanity's teacher of life. [PDF]

EMBO Rep
Leksa V.
europepmc   +1 more source

The major-axis distribution of long-period comets

, 1968
Le Poole, R.S., Katgert, P.
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Distribution of Aphelia of Long-period Comets

Distribution of Aphelia of Long-period Comets
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Meteor showers from known long-period comets

Icarus, 2021
Abstract What long-period comets with orbital periods >250 years cause detectable meteor showers on Earth? Low-light video cameras are used to track the motion of +4 to −5 magnitude meteors in our atmosphere by triangulation and calculate the meteoroid orbit in space.
Jenniskens, Peter, Lauretta, Dante S., Towner, Martin C., Heathcote, Steve, Jehin, Emmanuel, Hanke, Toni, Cooper, Tim, Baggaley, Jack W., Howell, J. Andreas, Johannink, Carl, Breukers, Martin, Odeh, Mohammad, Moskovitz, Nicholas, Juneau, Luke, Beck, Tim, De Cicco, Marcelo, Samuels, Dave, Rau, Steve, Albers, Jim, Gural, Peter S.   +19 more
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Photometry of four long-period comets

Planetary and Space Science, 2021
Abstract In this work we studied the activity of four long period comets at different heliocentric distances in order to explore their dust production and characteristics. The targets were the comets C/2011 A3 (Gibbs), C/2012 K1 (PanStarrs), C/2012 LP26 (Palomar) and C/2013 F3 (McNaught). Some of these objects have never been studied before.
Garcia, Romina Soledad, Gil Hutton, Ricardo Alfredo   +1 more
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Asymmetric nongravitational forces on long-period comets

Planetary and Space Science, 1995
Abstract We investigate the magnitude of the perturbation in a comet's energy caused by nongravitational forces and how these forces affect the dynamical evolution of long-period (LP) comets. From the study of the distribution of original energies or reciprocal semimajor axes ( 1 a ) orig of the observed sample of near-parabolic ...
A.D. Bolatto, J.A. Fernández, G.F. Carballo   +2 more
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Origin and Evolution of the Long-Period Comets

Earth, Moon, and Planets, 1996
We consider the changes of cometary perihelion distances as a process of diffusion in the value of q, due to perturbations by stars. We find more comets at large q values than is observed. This suggests that a large number of long-period comets is not observed.
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