Results 181 to 190 of about 2,082 (217)

Dynein synergises with EB1 to facilitate cortex-microtubule encounter and proper spindle positioning in metaphase

Efstathiou C, Ojkic N, Draviam VM.
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

Rapamycin Exerts Its Geroprotective Effects in the Ageing Human Immune System by Enhancing Resilience Against DNA Damage. [PDF]

Aging Cell
Kell L, Jones EJ, Gharahdaghi N, Wilkinson DJ, Smith K, Smith K, Atherton PJ, Simon AK, Cox LS, Alsaleh G.   +9 more
europepmc   +1 more source

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Origin of short period comets

Celestial Mechanics and Dynamical Astronomy, 1992
Reasons for interest in the origin of short-period comets and the difficulties of computing their long-term dynamical evolution are reviewed. The relative advantages of a source region in an extended ‘inner core’ of the Oort cloud or a compact ‘comet belt‘ just beyond the planetary system are finely balanced, and it is premature to consider the problem
M E Bailey, Bailey M E
exaly   +2 more sources

Invisible comets on evolutionary track of short-period comets

Celestial Mechanics and Dynamical Astronomy, 1992
We systematically surveyed the orbits of short-period (SP) comets that show a large change of perihelion distance (q) between 1-2 AU (visible comets) and 4-5 AU (invisible comets) during 4400 years. The data are taken from Cosmo-DICE (Nakamura and Yoshikawa 1991a), which is a long-term orbital evolution project for SP comets.
Makoto Yoshikawa, Nakamura Tsuko, Tsuko Nakamura   +2 more
exaly   +2 more sources

The origin of short-period comets

Icarus, 1990
Abstract Recent work has shown that if short-period comets predominantly occur as a result of planetary “captures” of long-period comets, the relevant source flux of nearly parabolic orbits must involve comets with perihelia in the range 5–30 AU, significantly beyond the region in which the flux is observationally constrained. The numbers and orbital
Mark E. Bailey, Chris R. Stagg
exaly   +2 more sources

Observational results for five short-period and five long-period comets

Planetary and Space Science, 2020
Abstract In this work we studied the activity of a group of long and short period comets at different heliocentric distances in order to explore and compare their dust production and characteristics. The targets observed were the comets 22P/Kopff, 29P/Schwassmann-Wachmann 1, 218P/LINEAR, 221P/LINEAR, 318P/McNaught-Hartley, C/2010 FB87 (WISE-Garradd),
Garcia, Romina Soledad, Gil-hutton, Ricardo Alfredo, García Migani, Esteban Andrés   +2 more
exaly   +3 more sources

Meteor contribution by short-period comets

1988
The contribution of P/Halley and other comets to the meteor streams are discussed. Particular attention is given to the meteoric production by P/Encke as the potential major contributor to the meteoric complex in the inner part of the solar system. The density and total mass of the meteoric stream associated with P/Encke is derived, taking into account
exaly   +2 more sources

New edition of the catalogue of short-period comets

Earth, Moon, and Planets, 1995
The Institute of Theoretical Astronomy in St. Petersburg and the Astronomical Institute in Bratislava are preparing a new edition of the Catalogue of short-period comets. This edition will be supplemented by short-period comets discovered after the year 1983 and comprises some new features, e. g. the evolution of orbital elements between the years 1750
Y. D. Medvedev, E. A. Kozlov, E. M. Pittich   +2 more
openaire   +1 more source