Results 51 to 60 of about 30,236 (236)

The chemical diversity of comets

, 2009
A fundamental question in cometary science is whether the different dynamical classes of comets have different chemical compositions, which would reflect different initial conditions.
A. Lecacheux, D. Bockelée-Morvan, D. Bockelée-Morvan, D. Bockelée-Morvan, D.A. Neufeld, D.C. Lis, Dariusz C. Lis, Dominique Bockelée-Morvan, J. Crovisier, Jacques Crovisier, Jérémie Boissier, N. Biver, N. Biver, N. Biver, Nicolas Biver, Pierre Colom, S. Gulkis   +16 more
core   +1 more source

Simulations of the Population of Centaurs II: Individual Objects [PDF]

, 2004
Detailed orbit integrations of clones of five Centaurs -- namely, 1996 AR20, 2060 Chiron, 1995 SN55, 2000 FZ53 and 2002 FY36 -- for durations of 3 Myr are presented. One of our Centaur sample starts with perihelion initially under the control of Jupiter (
Bailey, M. E., Evans, N. W., Horner, J.
core   +4 more sources

Light‐Switched Mesenchymal Stem Cells for In Situ Exosome Amplification in Craniofacial Bone Defect Reconstruction

Advanced Science, EarlyView.
Light‐switchable MSCs (MSC‐UCNPs) were constructed by intracellular incorporation of UCNPs. Upon 980 nm irradiation, UCNPs emitted localized ultraviolet light (365 nm), activating the ROS/HEXB/LAMP1 signaling pathway to suppress lysosome–multivesicular body fusion and thereby enhance exosome biogenesis. Embedded within an injectable hydrogel, MSC‐UCNPs
Tingting Wu, Yajing Liu, Shuman Wang, Xiaoming Bai, Luyun Zhang, Yuwei Liu, Zhiwen Fu, Chen Shi   +7 more
wiley   +1 more source

Comprehensive Analyses of the Strongly Carbon-chain Depleted Comets in Lowell Observatory’s Narrowband Photometry Database

The Planetary Science Journal
We present measurements, analyses, and results for the 17 strongly carbon-chain depleted comets in Lowell Observatory’s narrowband photometry database.
Allison N. Bair, David G. Schleicher
doaj   +1 more source

Gas Sources from the Coma and Nucleus of Comet 46P/Wirtanen Observed Using ALMA

The Astrophysical Journal, 2023
Gas-phase molecules in cometary atmospheres (comae) originate primarily from (1) outgassing by the nucleus, (2) sublimation of icy grains in the near-nucleus coma, and (3) coma (photo)chemical processes.
M. A. Cordiner, N. X. Roth, S. N. Milam, G. L. Villanueva, D. Bockelée-Morvan, A. J. Remijan, S. B. Charnley, N. Biver, D. C. Lis, C. Qi, B. P. Bonev, J. Crovisier, J. Boissier   +12 more
doaj   +1 more source

Jupiter - Friend or Foe? IV: The influence of orbital eccentricity and inclination

, 2011
For many years, it was assumed that Jupiter prevented the Earth from being subject to a punishing impact regime that would greatly hinder the development of life. Here, we present the 4th in a series of studies investigating this hypothesis.
B. W. Jones, Horner, J. Horner, Laasko
core   +1 more source

Simulations of the Population of Centaurs I: The Bulk Statistics [PDF]

, 2004
Large-scale simulations of the Centaur population are carried out. The evolution of 23328 particles based on the orbits of 32 well-known Centaurs is followed for up to 3 Myr in the forward and backward direction under the influence of the 4 massive ...
Asher, Bailey, Bauer, Boehnhardt, Chambers, Clube, Durda, Emel'yanenko, Evans, Fernández, Groussin, Hahn, Hainaut, Holman, Horner, Horner, J. Horner, Lamy, Levison, Levison, Lowry, M. E. Bailey, Morbidelli, N. W. Evans, Oikawa, Peixinho, Press, Sanzovo, van Woerkom, Weintraub, Öpik   +30 more
core   +3 more sources

Alternative Policy Designs to Help Farmers Select Profitable Conservation Practices

Agribusiness, EarlyView.
ABSTRACT Voluntary private carbon initiatives (VPCIs) promote the implementation of agricultural conservation practices that mitigate emissions of greenhouse gases (GHGs) via financial incentives to participating farmers. Simultaneously, an array of public policies supports the adoption of conservation practices through technical and financial ...
Oranuch Wongpiyabovorn, Alejandro Plastina   +1 more
wiley   +1 more source

Svante Arrhenius, cosmical physicist and auroral theorist [PDF]

History of Geo- and Space Sciences, 2013
Many scientists in the fin de siècle era saw a need to coordinate and unify the increasing amount of data relating the physical conditions of the Earth and the Sun; or more generally to establish a synthetic perspective that covered the earth sciences in
H. Kragh
doaj   +1 more source

Planetary Science Goals for the Spitzer Warm Era [PDF]

, 2007
The overarching goal of planetary astronomy is to deduce how the present collection of objects found in our Solar System were formed from the original material present in the proto-solar nebula.
B. Bhattacharya, C. M. Lisse, D. Trilling, E. Ryan, H. B. Hammel, J. Emery, J. Stansberry, Lisa J. Storrie-Lombardi, M. V. Sykes, Nancy A. Silbermann, Y. Fernandez   +10 more
core   +2 more sources