Results 211 to 220 of about 8,064,980 (248)

The GTP-tubulin cap is not the determinant of microtubule end stability in cells. [PDF]

Mol Biol Cell
Cassidy A, Farmer V, Arpağ G, Zanic M.
europepmc   +1 more source

Laboratory Investigation of Simultaneous Ultraviolet Photoprocessing and Temperature-Programmed Desorption of Interstellar Ice Analogs. [PDF]

ACS Earth Space Chem
Sarver CC, Walker CE, Widicus Weaver SL.
europepmc   +1 more source

Chemical Routes to Primitive Membranes: Prebiotic Lipid Formation at the Origin of Life. [PDF]

Life (Basel)
Shvetsova A, Fiore M.
europepmc   +1 more source

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

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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
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, Tsuko Nakamura
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

Meteoroid Impact Into Short-Period Comet Nuclei

Nature, 1981
The effects of extended meteoroid bombardment on short-period comet nuclei are examined and their possible implications for asteroid and meteorite studies are discussed. It is suggested that after devolatilization of the nucleus, the accumulated material might combine with primary cometary solids to produce environments conducive to the formation of ...
Mark J Cintala
exaly   +2 more sources

The Near-Parabolic Flux and the Origin of Short-Period Comets

Nature, 1986
The origin of short-period comets, usually believed to arise by planetary perturbations acting on nearly parabolic orbits, has been unclear for many years1. Given the observed near-parabolic flux, the predicted number of such comets is too small by a factor of ∼100 (refs 2–15).
M E Bailey
exaly   +2 more sources

Chondrulelike Objects in Short-Period Comet 81P/Wild 2

Science, 2008
The Stardust spacecraft returned cometary samples that contain crystalline material, but the origin of the material is not yet well understood. We found four crystalline particles from comet 81P/Wild 2 that were apparently formed by flash-melting at a high temperature and are texturally, mineralogically, and compositionally similar to chondrules ...
Takaaki Noguchi, Noriko T. Kita, Michael E. Zolensky   +2 more
exaly   +3 more sources