Results 61 to 70 of about 1,207,200 (332)
American Journal of Botany, Volume 109, Issue 12, Page 2068-2081, December 2022., 2022 Abstract Premise Approximately 14% of all fern species have physiologically active chlorophyllous spores that are much more short‐lived than the more common and dormant achlorophyllous spores. Most chlorophyllous‐spored species (70%) are epiphytes and account for almost 37% of all epiphytic ferns.
Daniela Mellado‐Mansilla +6 more
wiley +1 more source
The effect of planetary migration on the corotation resonance [PDF]
Monthly Notices of the Royal Astronomical Society, 2006 The migration of a planet through a gaseous disc causes the locations of their resonant interactions to drift and can alter the torques exerted between the planet and the disc. We analyse the time-dependent dynamics of a non-coorbital corotation resonance under these circumstances.
S. H. Lubow +2 more
openaire +3 more sources
Ammonia Synthesis at Room Temperature and Atmospheric Pressure from N2: A Boron‐Radical Approach
Angewandte Chemie International Edition, Volume 62, Issue 3, January 16, 2023., 2023 Boron‐centered radicals, generated by reduction of R2BCl derivatives, react with N2 all the way to borylamine formation. DFT calculations rationalize the reduction/functionalization process, involving N−N bond splitting. Hydrolysis of the mixture yields NH4+. Radical addition to N2 provides a new strategy for N2 fixation.
Soukaina Bennaamane +6 more
wiley +1 more source
Good Combination of the Rossiter-McLaughlin Measurements and Direct Imaging Observations
EPJ Web of Conferences, 2011 We introduce a novel methodology to distinguish planetary migration mechanisms by a combination of Rossiter-McLaughlin measurements and direct imaging observations.
Narita N.
doaj +1 more source
Suitability of Natura 2000 sites for threatened freshwater species under projected climate change
Aquatic Conservation: Marine and Freshwater Ecosystems, Volume 32, Issue 12, Page 1872-1887, December 2022., 2022 Abstract As part of the world's largest coordinated network of protected areas, Natura 2000, European Union member states designate special areas of conservation (SACs) to maintain or achieve favourable conservation status for imperilled aquatic species listed under Annex II of the Habitats Directive.
Timo Basen +4 more
wiley +1 more source
The effects of a magnetic field on planetary migration in laminar and turbulent discs [PDF]
, 2015 We investigate the migration of low-mass planets ($5 M_{\oplus}$ and $20 M_{\oplus}$) in accretion discs threaded with a magnetic field using 2D MHD code in polar coordinates.
M. Comins +5 more
semanticscholar +1 more source
Planetary migration in precessing discs for S-type wide binaries [PDF]
Monthly Notices of the Royal Astronomical Society, 2021 ABSTRACT The discovery of numerous circumprimary planets in the last few years has brought to the fore the question of planet formation in binary systems. The significant dynamical influence, during the protoplanetary disc phase, of a binary companion on a giant planet has previously been highlighted for wide binary stars. In particular,
Anne-Sophie Libert +2 more
openaire +3 more sources
Migrating microbes and planetary protection
Trends in Microbiology, 2009 Since the dawn of the space age, humans have wrestled with concerns about planetary cross-contamination. Spacecraft launched from Earth can transport hitchhiker microbes to new worlds on both robotic and crewed vehicles. As plans proceed for future life detection and human exploration missions, planetary protection considerations are again uppermost on
Department of Microbiology & Cell Science, University of Florida, Kennedy Space Center, FL 32899, USA ( host institution ) +3 more
openaire +4 more sources
Enhanced Size Uniformity for Near-resonant Planets
The Astrophysical Journal, 2023 Super-Earths within the same close-in, compact planetary system tend to exhibit a striking degree of uniformity in their radius, mass, and orbital spacing, and this “peas-in-a-pod” phenomenon itself serves to provide one of the strongest constrains on ...
Armaan V. Goyal, Fei Dai, Songhu Wang
doaj +1 more source
Planetary migration in resonance : the question of the eccentricities [PDF]
EAS Publications Series, 2010 The formation of resonant planets pairs in exoplanetary systems involves planetary migration inside the protoplanetary disc: an inwards migrating outer planet captures in Mean Motion Resonance an inner planet. During the migration of the resonant pair of planets, the eccentricities are expected to rise excessively, if no damping mechanism is applied on
Zs. Sándor +2 more
openaire +2 more sources