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428 Newest Publications in proceedings of the national academy of sciences current issue

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matching the following criteria

Sulfur-cycling fossil bacteria from the 1.8-Ga Duck Creek Formation provide promising evidence of evolution's null hypothesis [Earth, Atmospheric, and Planetary Sciences]

17-Feb-2015 | J. William Schopf; Anatoliy B. Kudryavtsev; Malcolm R. Walter; Martin J. Van Kranendonk; Kenneth H. Williford; Reinh ..., Proceedings of the National Academy of Sciences current issue, 2015

The recent discovery of a deep-water sulfur-cycling microbial biota in the ∼2.3-Ga Western Australian Turee Creek Group opened a new window to life's early history. We now report a second such subseafloor-inhabiting community from the Western Australian ∼1.8-Ga Duck Creek Formation. ...

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Proton-coupled electron transfer and the role of water molecules in proton pumping by cytochrome c oxidase [Biophysics and Computational Biology]

17-Feb-2015 | Vivek Sharma; Giray Enkavi; Ilpo Vattulainen; Tomasz Róg; Mårten Wikström, Proceedings of the National Academy of Sciences current issue, 2015

Molecular oxygen acts as the terminal electron sink in the respiratory chains of aerobic organisms. Cytochrome c oxidase in the inner membrane of mitochondria and the plasma membrane of bacteria catalyzes the reduction of oxygen to water, and couples the free energy of the reaction to proton ...

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Rapid loss of lakes on the Mongolian Plateau [Sustainability Science]

17-Feb-2015 | Shengli Tao; Jingyun Fang; Xia Zhao; Shuqing Zhao; Haihua Shen; Huifeng Hu; Zhiyao Tang; Zhiheng Wang; Qinghua Guo, Proceedings of the National Academy of Sciences current issue, 2015

Lakes are widely distributed on the Mongolian Plateau and, as critical water sources, have sustained Mongolian pastures for hundreds of years. However, the plateau has experienced significant lake shrinkage and grassland degradation during the past several decades. To quantify the changes in all ...

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Metal-free organic sensitizers for use in water-splitting dye-sensitized photoelectrochemical cells [Chemistry]

10-Feb-2015 | John R. Swierk; Dalvin D. Méndez-Hernández; Nicholas S. McCool; Paul Liddell; Yuichi Terazono; Ian Pahk; John J. Tom ..., Proceedings of the National Academy of Sciences current issue, 2015

Solar fuel generation requires the efficient capture and conversion of visible light. In both natural and artificial systems, molecular sensitizers can be tuned to capture, convert, and transfer visible light energy. We demonstrate that a series of metal-free porphyrins can drive ...

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Membranes serve as allosteric activators of phospholipase A2, enabling it to extract, bind, and hydrolyze phospholipid substrates [Biochemistry]

10-Feb-2015 | Varnavas D. Mouchlis; Denis Bucher; J. Andrew McCammon; Edward A. Dennis, Proceedings of the National Academy of Sciences current issue, 2015

Defining the molecular details and consequences of the association of water-soluble proteins with membranes is fundamental to understanding protein–lipid interactions and membrane functioning. Phospholipase A2 (PLA2) enzymes, which catalyze the hydrolysis of phospholipid substrates that compose ...

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Efficient meltwater drainage through supraglacial streams and rivers on the southwest Greenland ice sheet [Earth, Atmospheric, and Planetary Sciences]

27-Jan-2015 | Laurence C. Smith; Vena W. Chu; Kang Yang; Colin J. Gleason; Lincoln H. Pitcher; Asa K. Rennermalm; Carl J. Legleite ..., Proceedings of the National Academy of Sciences current issue, 2015

Thermally incised meltwater channels that flow each summer across melt-prone surfaces of the Greenland ice sheet have received little direct study. We use high-resolution WorldView-1/2 satellite mapping and in situ measurements to characterize supraglacial water storage, drainage pattern, and ...

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Physical and virtual water transfers for regional water stress alleviation in China [Environmental Sciences]

27-Jan-2015 | Xu Zhao; Junguo Liu; Qingying Liu; Martin R. Tillotson; Dabo Guan; Klaus Hubacek, Proceedings of the National Academy of Sciences current issue, 2015

Water can be redistributed through, in physical terms, water transfer projects and virtually, embodied water for the production of traded products. Here, we explore whether such water redistributions can help mitigate water stress in China. This study, for the first time to our knowledge, both ...

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Site-specific vibrational spectral signatures of water molecules in the magic H3O+(H2O)20 and Cs+(H2O)20 clusters [Chemistry]

23-Dec-2014 | Joseph A. Fournier; Conrad T. Wolke; Christopher J. Johnson; Mark A. Johnson; Nadja Heine; Sandy Gewinner; Wieland S ..., Proceedings of the National Academy of Sciences current issue, 2014

Theoretical models of proton hydration with tens of water molecules indicate that the excess proton is embedded on the surface of clathrate-like cage structures with one or two water molecules in the interior. The evidence for these structures has been indirect, however, because the experimental ...

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In This Issue [This Week in PNAS]

16-Dec-2014 | Proceedings of the National Academy of Sciences current issue, 2014

Thermodynamics of nuclear waste in water The long-term stability and fate of radioactive uranium oxides depend in part on the mineral phase containing the uranium, because some mineral phases degrade and dissolve more readily than others. Xiaofeng Guo et al. (pp. 17737–17742) investigated the ...

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Preserving ancient artifacts for the next millennia [Chemistry]

16-Dec-2014 | Samuel L. Zelinka, Proceedings of the National Academy of Sciences current issue, 2014

When wood is kept dry, it can remain intact for millennia, as evidenced by numerous artifacts from ancient Egypt (1). However, when wood interacts with water, numerous problems arise that can cause the wood to become permanently damaged or destroyed completely. Wood exhibits swelling on moisture ...

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