Results 21 to 30 of about 1,994 (199)

The distant activity of Short Period Comets^★- II. [PDF]

Monthly Notices of the Royal Astronomical Society, 2007
A surprisingly large number of short-period comets have been observed with significant activity (a coma and even a well-developed dust tail) at heliocentric distances greater than 3 au, where the water sublimation rate is low and thus the sublimation of other volatiles, such as for example CO, could drive the presence of a coma.
E. Mazzotta Epifani, P. Palumbo, M. T. Capria, G. Cremonese, M. Fulle, L. Colangeli   +5 more
openaire   +2 more sources

The Return of the Rosetta Target: Keck Near-infrared Observations of Comet 67P/Churyumov–Gerasimenko in 2021

The Astronomical Journal, 2023
High-resolution near-infrared ground-based spectroscopic observations of comet 67P/Churyumov–Gerasimenko near its maximum activity in 2021 were conducted from the W. M. Keck Observatory, using the facility spectrograph NIRSPEC.
Boncho P. Bonev, Neil Dello Russo, Hideyo Kawakita, Ronald J. Vervack Jr., Michael A. DiSanti, Yoshiharu Shinnaka, Takafumi Ootsubo, Erika L. Gibb, Michael R. Combi, Kathrin Altwegg, Nicolas Biver, Jacques Crovisier, Gregory Doppmann, Geronimo L. Villanueva, Younas Khan, Chemeda T. Ejeta, Mohammad Saki, Adam J. McKay, Anita L. Cochran, Emmanuel Jehin, Nathan X. Roth, Martin A. Cordiner, Yinsi Shou   +22 more
doaj   +1 more source

Planetary Trojans – the main source of short period comets? [PDF]

International Journal of Astrobiology, 2010
AbstractOne of the key considerations when assessing the potential habitability of telluric worlds will be that of the impact regime experienced by the planet. In this work, we present a short review of our understanding of the impact regime experienced by the terrestrial planets within our own Solar system, describing the three populations of ...
Horner, Jonathan, Lykawka, Patryk Sofia
openaire   +2 more sources

Outcomes of periodontal therapy: Strengthening the relevance of research to patients. A co‐created review

Periodontology 2000, EarlyView., 2023
Abstract Periodontitis is a long‐term condition affecting up to half of the population globally and causing significant impacts on life quality. Successful management depends on taking life‐long ownership of the condition by those affected. There is a wealth of research to inform on management options. However, most of the research has been designed by
Ian Needleman, Neil Almond, Natalie Leow, Jim Phillips   +3 more
wiley   +1 more source

Ice, Ice, Maybe? Investigating 46P/Wirtanen’s Inner Coma for Icy Grains

The Planetary Science Journal, 2023
The release of volatiles from comets is usually from direct sublimation of ices on the nucleus, but for very or hyperactive comets other sources have to be considered to account for the total production rates.
Theodore Kareta, John W. Noonan, Walter M. Harris, Alessondra Springmann   +3 more
doaj   +1 more source

Long Dust Trails of Short Period Comets [PDF]

International Astronomical Union Colloquium, 1991
Comets constitute an important source for the zodiacal dust cloud. Mainly large particles are contributed because the smaller particles are emitted into hyperbolic orbits relative to the sun. Radiation pressure force reduces the effective solar gravitational attraction. Information about large cometary particles can be derived from a variety of sources
H. U. Keller, K. Richter
openaire   +1 more source

COSINE (Cometary Object Study Investigating Their Nature and Evolution). I. Project Overview and General Characteristics of Detected Comets

The Astrophysical Journal Supplement Series
We present the first results from the Cometary Object Study Investigating their Nature and Evolution (COSINE) project, based on a uniformly processed data set of 484 comets observed over the full 15 yr duration of the Wide-field Infrared Survey Explorer (
Yuna G. Kwon, Dar W. Dahlen, Joseph R. Masiero, James M. Bauer, Yanga R. Fernández, Adeline Gicquel, Yoonyoung Kim, Jana Pittichová, Frank Masci, Roc M. Cutri, Amy K. Mainzer   +10 more
doaj   +1 more source

The activity characteristics and mechanisms of long-period comets

Earth and Planetary Physics
Comets are small celestial bodies orbiting around the Sun. They are remnants left over from the formation of the solar system; their interiors store original material of the planetary disk within the solar system. They are thus "fossils" for studying the
YingQi Wu, JianChun Shi, Man-To Hui, Xian Shi   +3 more
doaj   +1 more source

Micro and Nanostructural Diversity of Lizard Osteoderm Capping Tissue in Relation to Mechanical Performance

Advanced Functional Materials, EarlyView.
This study shows that lizard osteoderm capping tissue is a hyper‐mineralized hydroxyapatite layer consistently covering the superficial osteoderm surface in those species studied here, yet it varies greatly in morphology, nanostructure, and mechanical performance across species.
Adrian Rodriguez‐Palomo, Marius Didziokas, Malene Siri Berg Jacobsen, Thorbjørn Erik Køppen Christensen, Innokenty Kantor, Mads Ry Vogel Jørgensen, Klaus Pagh Almtoft, Jesper Skovhus Thomsen, Anthony Herrel, Catherine J.A. Williams, Henrik Birkedal   +10 more
wiley   +1 more source

Redefining Therapies for Drug‐Resistant Tuberculosis: Synergistic Effects of Antimicrobial Peptides, Nanotechnology, and Computational Design

Advanced Healthcare Materials, EarlyView.
Antimicrobial peptide (AMP)‐loaded nanocarriers provide a multifunctional strategy to combat drug‐resistant Mycobacterium tuberculosis. By enhancing intracellular delivery, bypassing efflux pumps, and disrupting bacterial membranes, this platform restores phagolysosome fusion and macrophage function.
Christian S. Carnero Canales, Jessica Ingrid Marquez Cazorla, Renzo Marianito Marquez Cazorla, Aline Martins dos Santos, Jonatas Lobato Duarte, Letícia Oliveira Catarin Nunes, Túlio Custódio Reis, Lara Cerazi Salvador, Norival Alves Santos‐Filho, Rafael Miguel Sábio, Hélder A. Santos, Fernando Rogério Pavan   +11 more
wiley   +1 more source