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Complex archaea that bridge the gap between prokaryotes and eukaryotes

mercredi 6 mai 2015 par Anja Spang, Jimmy H. Saw, Steffen L. Jørgensen, Katarzyna Zaremba-Niedzwiedzka, Joran Martijn, Anders E. Lind, Roel van Eijk, Christa Schleper, Lionel Guy, Thijs J. G. Ettema
The origin of the eukaryotic cell remains one of the most contentious puzzles in modern biology. Recent studies have provided support for the emergence of the eukaryotic host cell from within the archaeal domain of life, but the identity and nature of the putative archaeal ancestor (...)

An alternative pluripotent state confers interspecies chimaeric competency

mercredi 6 mai 2015 par Jun Wu, Daiji Okamura, Mo Li, Keiichiro Suzuki, Chongyuan Luo, Li Ma, Yupeng He, Zhongwei Li, Chris Benner, Isao Tamura, Marie N. Krause, Joseph R. Nery, Tingting Du, Zhuzhu Zhang, Tomoaki Hishida, Yuta Takahashi, Emi Aizawa, Na Young Kim, Jeronimo Lajara, Pedro Guillen, Josep M. Campistol, Concepcion Rodriguez Esteban, Pablo J. Ross, Alan Saghatelian, Bing Ren, Joseph R. Ecker, Juan Carlos Izpisua Belmonte
Pluripotency, the ability to generate any cell type of the body, is an evanescent attribute of embryonic cells. Transitory pluripotent cells can be captured at different time points during embryogenesis and maintained as embryonic stem cells or epiblast stem cells in culture. Since ontogenesis (...)

Evolution: Steps on the road to eukaryotes

mercredi 6 mai 2015 par T. Martin Embley, Tom A. Williams
A new archaeal phylum represents the closest known relatives of eukaryotes, the group encompassing all organisms that have nucleated cells. The discovery holds promise for a better understanding of eukaryotic origins. See Article (...)

Coordinated regulation of bidirectional COPI transport at the Golgi by CDC42

mercredi 6 mai 2015 par Seung-Yeol Park, Jia-Shu Yang, Angela B. Schmider, Roy J. Soberman, Victor W. Hsu
The Golgi complex has a central role in the intracellular sorting of secretory proteins. Anterograde transport through the Golgi has been explained by the movement of Golgi cisternae, known as cisternal maturation. Because this explanation is now appreciated to be incomplete, interest has (...)

Materials chemistry: Organic polymers form fuel from water

mercredi 6 mai 2015 par Vijay S. Vyas, Bettina V. Lotsch
Porous polymers have joined the ranks of light-activated catalysts that split water into hydrogen, a carbon-free alternative to fossil fuels. Their properties are easily tuned — a big plus for the development of practically useful (...)

50 & 100 Years Ago

mercredi 6 mai 2015
50 Years Ago'The sign of the constant of gravitation'. By Prof. W. H. McCrea — A speaker in a recent broadcast asserted that, were the gravitation-constant negative instead of positive, Newton's apple would have soared away into the sky instead of falling on (...)

Computer science: Nanoscale connections for brain-like circuits

mercredi 6 mai 2015 par Robert Legenstein
Tiny circuit elements called memristors have been used as connections in an artificial neural network – enabling the system to learn to recognize letters of the alphabet from imperfect images. See Letter p.61

Evolution: Beauty varies with the light

mercredi 6 mai 2015 par Ole Seehausen
Experimental work on guppies suggests that variation in light between microhabitats is what makes females prefer different male signal combinations, thus explaining the evolution and persistence of colour variation in males.

Correction

mercredi 6 mai 2015
The Comment 'Five priorities for the UN Sustainable Development Goals' (Y.Luet al. Nature520, 432–433; 2015 ) gave an incorrect affiliation for co-author Nebojsa Nakicenovic. He is deputy director-general of the International Institute for Applied (...)

Tempus omnia revelat

mercredi 6 mai 2015 par Tian Li
A historical perspective.

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