Neural Decoding of Visual Imagery During Sleep
Publié par Oldcola dans neuroscience le mai 14, 2013
Neural Decoding of Visual Imagery During Sleep
T. Horikawa, M. Tamaki, Y. Miyawaki, Y. Kamitani
Science 3 May 2013: Vol. 340 no. 6132 pp. 639-642 doi: 10.1126/science.1234330
Emergence and Diversification of Fly Pigmentation Through Evolution of a Gene Regulatory Module
Publié par Oldcola dans development, evolution le mars 22, 2013
Laurent Arnoult, Kathy F. Y. Su, Diogo Manoel, Caroline Minervino, Justine Magriña, Nicolas Gompel, and Benjamin Prud’homme
Science 22 March 2013: 339 (6126), 1423-1426. doi: 10.1126/science.1233749
TEMPO AND MODE OF MULTICELLULAR ADAPTATION IN EXPERIMENTALLY-EVOLVED SACCHAROMYCES CEREVISIAE
TEMPO AND MODE OF MULTICELLULAR ADAPTATION IN EXPERIMENTALLY-EVOLVED SACCHAROMYCES CEREVISIAE
William C. Ratcliff, Jennifer T. Pentz, Michael Travisano
doi: 10.1111/evo.12101
Multicellular complexity is a central topic in biology, but the evolutionary processes underlying its origin are difficult to study and remain poorly understood. Here we use experimental evolution to investigate the tempo and mode of multicellular adaptation during a de novo evolutionary transition to multicellularity. Multicelled ‘snowflake’ yeast evolved from a unicellular ancestor after 7 days of selection for faster settling through liquid media. Over the next 220 days, snowflake yeast evolved to settle 44% more quickly. Throughout the experiment the clusters evolved faster settling by three distinct modes. The number of cells per cluster increased from a mean of 42 cells after 7 days of selection to 114 cells after 227 days. Between days 28 and 65, larger clusters evolved via a 2-fold increase in the mass of individual cells. By day 227, snowflake yeast evolved to form more hydrodynamic clusters that settle more quickly for their size than ancestral strains. The timing and nature of adaptation in our experiment suggests that costs associated with large cluster size favor novel multicellular adaptations, increasing organismal complexity.
Experimental demonstration of optical transport, sorting and self-arrangement using a ‘tractor beam’
Experimental demonstration of optical transport, sorting and self-arrangement using a ‘tractor beam’
O. Brzobohatý, V. Karásek, M. Šiler, L. Chvátal, T. Čižmár & P. Zemánek
Nature Photonics 7, 123–127 (2013) doi:10.1038/nphoton.2012.33210.1038/nphoton.2012.332
Genomic Diversity and Evolution of the Head Crest in the Rock Pigeon
Publié par Oldcola dans development, genetic determinism, genetics le février 5, 2013
Genomic Diversity and Evolution of the Head Crest in the Rock Pigeon
Shapiro MD et al
Science DOI: 10.1126/science.1230422
Or, les lois de la physique contiennent la notion de champ d’orientation, qui une fois comprise implique un sens de déformation des animaux gravé dans les tissus. [Vincent Fleury, Source]
Gravé dans les tissus peut-être, mais par l’expression génique 
celebrating Aaron Swartz
Publié par Oldcola dans information le janvier 13, 2013
Sometimes you want to celebrate even suicide!
Hope you got this in your RSS reader
What Is Stochastic Resonance? Definitions, Misconceptions, Debates, and Its Relevance to Biology
Publié par Oldcola dans informatics, information, information filtering, neuroscience le janvier 13, 2013
What Is Stochastic Resonance? Definitions, Misconceptions, Debates, and Its Relevance to Biology
McDonnell MD, Abbott D (2009)
PLoS Comput Biol 5(5): e1000348. doi:10.1371/journal.pcbi.1000348
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