Neural Decoding of Visual Imagery During Sleep

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

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

π day

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.

Darwin Day

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

Genomic Diversity and Evolution of the Head Crest in the Rock Pigeon

Shapiro MD et al

Science DOI: 10.1126/science.1230422

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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

Making progress…

celebrating Aaron Swartz

Sometimes you want to celebrate even suicide!
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What Is Stochastic Resonance? Definitions, Misconceptions, Debates, and Its Relevance to Biology

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