Archives de 30 juin 2009

blogo-links

Publié par Oldcola dans Interesting stuff le juin 30, 2009

@yokofakun: Test your knowledge about Darwin & Evolution (In French) doc: http://tinyurl.com/mnek9m ( via Nouvel Obs http://tinyurl.com/laml8s )

@sciencesetdemoc: Revue2web: Génétiquement pro-OGM http://tinyurl.com/njgtcb

@rubp: RT @tweetmeme BioData Product Blog – Carbon Dioxide Affects Fish Ear Structure http://bit.ly/ToOA1 #biodata

Related: Elevated CO2 Enhances Otolith Growth in Young Fish
David M. Checkley, Jr., Andrew G. Dickson, Motomitsu Takahashi, J. Adam Radich, Nadine Eisenkolb, Rebecca Asch

A large fraction of the carbon dioxide added to the atmosphere by human activity enters the sea, causing ocean acidification. We show that otoliths (aragonite ear bones) of young fish grown under high CO2 (low pH) conditions are larger than normal, contrary to expectation. We hypothesize that CO2 moves freely through the epithelium around the otoliths in young fish, accelerating otolith growth while the local pH is controlled. This is the converse of the effect commonly reported for structural biominerals.

Science 26 June 2009, Vol. 324. no. 5935, p. 1683, doi: 10.1126/science.1169806

Researchers discover new fluorescent silicon nanoparticles

Researchers in the Department of Physics and Astronomy at the University of Leicester have developed a new synthesis method, which has led them to the discovery of fluorescent silicon nanoparticles and may ultimately help track the uptake of drugs by the body’s cells.

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Early Cell Fate Decisions of Human Embryonic Stem Cells and Mouse Epiblast Stem Cells Are Controlled by the Same Signalling Pathways.

Publié par Oldcola dans development, differentiation, stem cells le juin 30, 2009

Early Cell Fate Decisions of Human Embryonic Stem Cells and Mouse Epiblast Stem Cells Are Controlled by the Same Signalling Pathways.

Vallier L, Touboul T, Chng Z, Brimpari M, Hannan N, et al. (2009)

PLoS ONE 4(6): e6082. doi:10.1371/journal.pone.0006082

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The Hedgehog Signaling Pathway: Where Did It Come From?

Publié par Oldcola dans development, evolution le juin 30, 2009

The Hedgehog Signaling Pathway: Where Did It Come From?

Hausmann G, von Mering C, Basler K, 2009.

PLoS Biol 7(6): e1000146. doi:10.1371/journal.pbio.1000146

Complex body plans require sophisticated cell–cell signaling pathways. How these pathways evolved is often not very well understood. Here, we argue that the Hedgehog (Hh) signaling pathway may have arisen from systems that were originally designed for the transport and homeostasis of certain bacterial sterol analogs—the hopanoids. We propose a possible scenario for the evolution of Hh signaling and discuss how evolutionary considerations can shed light on the mysterious communication between the membrane-bound Hh transducers Patched (Ptc) and Smoothened (Smo).

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