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

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Synthesis of lithium polyhydrides above 130 GPa at 300 K [Physics]

23-Jun-2015 | Charles Pépin; Paul Loubeyre; Florent Occelli; Paul Dumas, Proceedings of the National Academy of Sciences current issue, 2015

The prediction of novel lithium hydrides with nontraditional stoichiometries at high pressure has been seminal for highlighting a promising line of research on hydrogen-dense materials. Here, we report the evidences of the disproportionation of LiH above 130 GPa to form lithium hydrides ...

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SAR11 lipid renovation in response to phosphate starvation [Environmental Sciences]

23-Jun-2015 | Paul Carini; Benjamin A. S. Van Mooy; J. Cameron Thrash; Angelicque White; Yanlin Zhao; Emily O. Campbell; Helen F. ..., Proceedings of the National Academy of Sciences current issue, 2015

Phytoplankton inhabiting oligotrophic ocean gyres actively reduce their phosphorus demand by replacing polar membrane phospholipids with those lacking phosphorus. Although the synthesis of nonphosphorus lipids is well documented in some heterotrophic bacterial lineages, phosphorus-free lipid ...

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Meteorite-catalyzed synthesis of nucleosides and other prebiotic compounds [Chemistry]

09-Jun-2015 | Martin Ferus; Antonín Knížek; Svatopluk Civiš, Proceedings of the National Academy of Sciences current issue, 2015

The origin of life is a longstanding enigma that fascinates scientists and the general public alike. Scientific efforts have yielded a significant amount of data over the last 100 y following a fundamental cornerstone publication: Proiskhozhozhdenie Zhizny (Origin of Life) by Alexander Ivanovich ...

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Synthesis of refractory organic matter in the ionized gas phase of the solar nebula [Earth, Atmospheric, and Planetary Sciences]

09-Jun-2015 | Maïa Kuga; Bernard Marty; Yves Marrocchi; Laurent Tissandier, Proceedings of the National Academy of Sciences current issue, 2015

In the nascent solar system, primitive organic matter was a major contributor of volatile elements to planetary bodies, and could have played a key role in the development of the biosphere. However, the origin of primitive organics is poorly understood. Most scenarios advocate cold synthesis in ...

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Entamoeba mitosomes play an important role in encystation by association with cholesteryl sulfate synthesis [Evolution]

02-Jun-2015 | Fumika Mi-ichi; Tomofumi Miyamoto; Shouko Takao; Ghulam Jeelani; Tetsuo Hashimoto; Hiromitsu Hara; Tomoyoshi Nozaki; ..., Proceedings of the National Academy of Sciences current issue, 2015

Hydrogenosomes and mitosomes are mitochondrion-related organelles (MROs) that have highly reduced and divergent functions in anaerobic/microaerophilic eukaryotes. Entamoeba histolytica, a microaerophilic, parasitic amoebozoan species, which causes intestinal and extraintestinal amoebiasis in ...

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Ultrafast desorption of colloidal particles from fluid interfaces [Engineering]

12-May-2015 | Vincent Poulichet; Valeria Garbin, Proceedings of the National Academy of Sciences current issue, 2015

The self-assembly of solid particles at fluid–fluid interfaces is widely exploited to stabilize emulsions and foams, and in materials synthesis. The self-assembly mechanism is very robust owing to the large capillary energy associated with particle adsorption, of the order of millions of times ...

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Salmonella promotes virulence by repressing cellulose production [Microbiology]

21-Apr-2015 | Mauricio H. Pontes; Eun-Jin Lee; Jeongjoon Choi; Eduardo A. Groisman, Proceedings of the National Academy of Sciences current issue, 2015

Cellulose is the most abundant organic polymer on Earth. In bacteria, cellulose confers protection against environmental insults and is a constituent of biofilms typically formed on abiotic surfaces. We report that, surprisingly, Salmonella enterica serovar Typhimurium makes cellulose when inside ...

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The fossil record of phenotypic integration and modularity: A deep-time perspective on developmental and evolutionary dynamics [Evolution]

21-Apr-2015 | Anjali Goswami; Wendy J. Binder; Julie Meachen; F. Robin O’Keefe, Proceedings of the National Academy of Sciences current issue, 2015

Variation is the raw material for natural selection, but the factors shaping variation are still poorly understood. Genetic and developmental interactions can direct variation, but there has been little synthesis of these effects with the extrinsic factors that can shape biodiversity over large ...

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PAB is an assembly chaperone that functions downstream of chaperonin 60 in the assembly of chloroplast ATP synthase coupling factor 1 [Plant Biology]

31-Mar-2015 | Juan Mao; Wei Chi; Min Ouyang; Baoye He; Fan Chen; Lixin Zhang, Proceedings of the National Academy of Sciences current issue, 2015

The chloroplast ATP synthase, a multisubunit complex in the thylakoid membrane, catalyzes the light-driven synthesis of ATP, thereby supplying the energy for carbon fixation during photosynthesis. The chloroplast ATP synthase is composed of both nucleus- and chloroplast-encoded proteins that have ...

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ORMDL orosomucoid-like proteins are degraded by free-cholesterol-loading-induced autophagy [Cell Biology]

24-Mar-2015 | Shuhui Wang; Peggy Robinet; Jonathan D. Smith; Kailash Gulshan, Proceedings of the National Academy of Sciences current issue, 2015

Eukaryotic cells have evolved robust mechanisms to counter excess cholesterol including redistribution of lipids into different compartments and compensatory up-regulation of phospholipid biosynthesis. We demonstrate here that excess cellular cholesterol increased the activity of the endoplasmic ...

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