Results 71 to 80 of about 1,838,056 (157)

The Origin and Evolution of Viruses as Molecular Organisms [PDF]

, 2009
Viruses are the most abundant life forms and the repertoire of viral genes is greater than that of cellular genes. It is also evident that viruses have played a major role in driving cellular evolution, and yet, viruses are not part of mainstream biology,
Claudiu I. Bandea
core   +2 more sources

Molecular Clouds: Internal Properties, Turbulence, Star Formation and Feedback

, 2012
All stars are born in molecular clouds, and most in giant molecular clouds (GMCs), which thus set the star formation activity of galaxies. We first review their observed properties, including measures of mass surface density, Sigma, and thus mass, M.
Shaske, Suzanne N., Tan, Jonathan C., Van Loo, Sven   +2 more
core   +1 more source

Population genomics and epigenomics of Spirodela polyrhiza provide insights into the evolution of facultative asexuality

Communications Biology
Many plants are facultatively asexual, balancing short-term benefits with long-term costs of asexuality. During range expansion, natural selection likely influences the genetic controls of asexuality in these organisms.
Yangzi Wang, Pablo Duchen, Alexandra Chávez, K. Sowjanya Sree, Klaus J. Appenroth, Hai Zhao, Martin Höfer, Meret Huber, Shuqing Xu   +8 more
doaj   +1 more source

CS, HC3N and CH3CCH multi-line analyses towards starburst galaxies. The evolution of cloud structures in the central regions of galaxies

, 2010
We aim to study the properties of the dense molecular gas towards the inner few 100 pc of four nearby starburst galaxies dominated both by photo dissociation regions (M82) and large-scale shocks (NGC253, IC342 and Maffei2), and to relate the chemical and
Aladro, Rebeca, Bayet, Estelle, Martin, Sergio, Martin-Pintado, Jesus, Mauersberger, Rainer   +4 more
core   +1 more source

Genetic Mechanism of Non-Targeted-Site Resistance to Diquat in Spirodela polyrhiza

Plants
Understanding non-target-site resistance (NTSR) to herbicides represents a pressing challenge as NTSR is widespread in many weeds. Using giant duckweed (Spirodela polyrhiza) as a model, we systematically investigated genetic and molecular mechanisms of ...
Martin Höfer, Martin Schäfer, Yangzi Wang, Samuel Wink, Shuqing Xu   +4 more
doaj   +1 more source

Second Symposium on Chemical Evolution and the Origin of Life [PDF]

Recent findings by NASA Exobiology investigators are reported. Scientific papers are presented in the following areas: cosmic evolution of biogenic compounds, prebiotic evolution (planetary and molecular), early evolution of life (biological and ...
Devincenzi, D. L., model.
core   +1 more source

Non-Abelian Berry transport, spin coherent states, and Majorana points

, 2011
We consider the adiabatic evolution of Kramers degenerate pairs of spin states in a half-integer spin molecular magnet as the molecule is slowly rotated.
Liu, Yun, Roy, Abhishek, Stone, Michael
core   +1 more source

Artificially Expanded Genetic Information Systems for New Aptamer Technologies

Biomedicines, 2018
Directed evolution was first applied to diverse libraries of DNA and RNA molecules a quarter century ago in the hope of gaining technology that would allow the creation of receptors, ligands, and catalysts on demand.
Elisa Biondi, Steven A. Benner
doaj   +1 more source

Evolution of interstellar dust and stardust in the solar neighbourhood

, 2007
The abundance evolution of interstellar dust species originating from stellar sources and from condensation in molecular clouds in the local interstellar medium of the Milky Way is studied and the input of dust material to the Solar System is determined.
Akerman, Alibes, Allende Prieto, Allende Prieto, Alongi, Amari, Amari, Anders, Anders, Basu, Bensby, Bensby, Berczik, Bertelli, Bianchi, Borkowski, Bradley, Bradley, Braun, Bressan, Caffau, Cartledge, Cayrel, Charbonnel, Chiappini, Chiar, Chiosi, Croat, Cunha, Cunha, da Silva, Daflon, Daulton, Delahaye, Demyk, Demyk, Dickey, Dopita, Draine, Dwek, Dwek, Dwek, Dwek, Edmunds, Edvardsson, Elmegreen, Ercolano, Falgarone, Feldman, Ferrarotti, François, Gil-Pons, Goswami, Gratton, Grevesse, H.-P. Gail, Hachisu, Helmi, Hirashita, Hollenbach, Holmberg, Holmgren, Holweger, Hoppe, Hoppe, Inoue, Iwamoto, Jenniskens, Jones, Jones, Jones, Jonsell, Jäger, Karakas, Karakas, Kemper, Kemper, Kennicutt, Kimura, Kimura, Kobayashi, Kozasa, Kroupa, Kroupa, Krumholz, Lamers, Leisawitz, Liffman, Lisenfeld, Lyubimkov, Lyubimkov, M. Trieloff, Mathis, Matteucci, Matzner, McKeegan, Melendez, Mera, Messenger, Messenger, Meynet, Miller, Min, Molster, Morgan, Nguyen, Nomoto, Nordström, Nozawa, Olling, Pollack, Pont, Portinari, Preibisch, Ramírez, Rana, Reddy, Reddy, Reiteri, Rocha-Pinto, Rocha-Pinto, Rolleston, S. Zhukovska, Salpeter, Savage, Scalo, Schaerer, Schaller, Schneider, Smith, Smith, Sofia, Soubiran, Spitzer, Sugerman, Talbot, Tammann, Tielens, Tielens, Tielens, Timmes, Todini, Trampedach, Travaglio, van den Hoek, van der Hucht, van Dishoeck, van Loon, Venn, Vollmer, Vorobyov, Welty, Williams, Woitke, Woosley, Zhao, Zinner, Zolensky, Zubko   +158 more
core   +1 more source

New mechanism for non-trivial intra-molecular vibrational dynamics

, 2009
We investigate the time evolution process of one selected (initially prepared by optical pumping) vibrational molecular state, coupled to all other intra-molecular vibrational states of the same molecule, and also to its environment.
Benderskii, V. A., Kats, E. I.
core   +1 more source