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

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Switching of perpendicularly polarized nanomagnets with spin orbit torque without an external magnetic field by engineering a tilted anisotropy [Engineering]

18-Aug-2015 | Long You; OukJae Lee; Debanjan Bhowmik; Dominic Labanowski; Jeongmin Hong; Jeffrey Bokor; Sayeef Salahuddin, Proceedings of the National Academy of Sciences current issue, 2015

Spin orbit torque (SOT) provides an efficient way to significantly reduce the current required for switching nanomagnets. However, SOT generated by an in-plane current cannot deterministically switch a perpendicularly polarized magnet due to symmetry reasons. On the other hand, perpendicularly ...

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QnAs with Ben Barres [QnAs]

18-Aug-2015 | Prashant Nair, Proceedings of the National Academy of Sciences current issue, 2015

The density of cells in the human brain defies imagination. Among the cellular throng, neurons garner much of the credit for brain function. Viewed under the microscope, however, slices of brain tissue are crisscrossed by swarms of cells of varying shapes. Collectively called glia, these cells ...

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A genetic basis of variation in eccrine sweat gland and hair follicle density [Developmental Biology]

11-Aug-2015 | Yana G. Kamberov; Elinor K. Karlsson; Gerda L. Kamberova; Daniel E. Lieberman; Pardis C. Sabeti; Bruce A. Morgan; Cl ..., Proceedings of the National Academy of Sciences current issue, 2015

Among the unique features of humans, one of the most salient is the ability to effectively cool the body during extreme prolonged activity through the evapotranspiration of water on the skin’s surface. The evolution of this novel physiological ability required a dramatic increase in the density ...

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Activity-dependent mismatch between axo-axonic synapses and the axon initial segment controls neuronal output [Neuroscience]

04-Aug-2015 | Winnie Wefelmeyer; Daniel Cattaert; Juan Burrone, Proceedings of the National Academy of Sciences current issue, 2015

The axon initial segment (AIS) is a structure at the start of the axon with a high density of sodium and potassium channels that defines the site of action potential generation. It has recently been shown that this structure is plastic and can change its position along the axon, as...

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Quantum dimer model for the pseudogap metal [Physics]

04-Aug-2015 | Matthias Punk; Andrea Allais; Subir Sachdev, Proceedings of the National Academy of Sciences current issue, 2015

We propose a quantum dimer model for the metallic state of the hole-doped cuprates at low hole density, p. The Hilbert space is spanned by spinless, neutral, bosonic dimers and spin S=1/2, charge +e fermionic dimers. The model realizes a “fractionalized Fermi liquid” with no symmetry breaking and ...

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Magnetic levitation of single cells [Applied Biological Sciences]

14-Jul-2015 | Naside Gozde Durmus; H. Cumhur Tekin; Sinan Guven; Kaushik Sridhar; Ahu Arslan Yildiz; Gizem Calibasi; Ionita Ghiran ..., Proceedings of the National Academy of Sciences current issue, 2015

Several cellular events cause permanent or transient changes in inherent magnetic and density properties of cells. Characterizing these changes in cell populations is crucial to understand cellular heterogeneity in cancer, immune response, infectious diseases, drug resistance, and evolution. ...

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Rescaling of metal oxide nanocrystals for energy storage having high capacitance and energy density with robust cycle life [Engineering]

30-Jun-2015 | Hyung Mo Jeong; Kyung Min Choi; Tao Cheng; Dong Ki Lee; Renjia Zhou; Il Woo Ock; Delia J. Milliron; William A. Godda ..., Proceedings of the National Academy of Sciences current issue, 2015

Nanocrystals are promising structures, but they are too large for achieving maximum energy storage performance. We show that rescaling 3-nm particles through lithiation followed by delithiation leads to high-performance energy storage by realizing high capacitance close to the theoretical ...

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Random sampling of skewed distributions implies Taylor's power law of fluctuation scaling [Statistics]

23-Jun-2015 | Joel E. Cohen; Meng Xu, Proceedings of the National Academy of Sciences current issue, 2015

Taylor’s law (TL), a widely verified quantitative pattern in ecology and other sciences, describes the variance in a species’ population density (or other nonnegative quantity) as a power-law function of the mean density (or other nonnegative quantity): Approximately, variance = a(mean)b, a > 0. ...

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High-capacity electrode materials for rechargeable lithium batteries: Li3NbO4-based system with cation-disordered rocksalt structure [Chemistry]

23-Jun-2015 | Naoaki Yabuuchi; Mitsue Takeuchi; Masanobu Nakayama; Hiromasa Shiiba; Masahiro Ogawa; Keisuke Nakayama; Toshiaki Oht ..., Proceedings of the National Academy of Sciences current issue, 2015

Rechargeable lithium batteries have rapidly risen to prominence as fundamental devices for green and sustainable energy development. Lithium batteries are now used as power sources for electric vehicles. However, materials innovations are still needed to satisfy the growing demand for increasing ...

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Predicting visual acuity from the structure of visual cortex [Computer Sciences]

23-Jun-2015 | Shyam Srinivasan; C. Nikoosh Carlo; Charles F. Stevens, Proceedings of the National Academy of Sciences current issue, 2015

Three decades ago, Rockel et al. proposed that neuronal surface densities (number of neurons under a square millimeter of surface) of primary visual cortices (V1s) in primates is 2.5 times higher than the neuronal density of V1s in nonprimates or many other cortical regions in primates and ...

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