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300 Aktuelle Fachpublikationen zum Thema temperature

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Part-crystalline part-liquid state and rattling-like thermal damping in materials with chemical-bond hierarchy [Physics]

21.10.2014 | Wujie Qiu; Lili Xi; Ping Wei; Xuezhi Ke; Jihui Yang; Wenqing Zhang, Proceedings of the National Academy of Sciences current issue, 2014

Understanding thermal and phonon transport in solids has been of great importance in many disciplines such as thermoelectric materials, which usually requires an extremely low lattice thermal conductivity (LTC). By analyzing the finite-temperature structural and vibrational characteristics of ...

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Caenorhabditis elegans RSD-2 and RSD-6 promote germ cell immortality by maintaining small interfering RNA populations [Genetics]

14.10.2014 | Aisa Sakaguchi; Peter Sarkies; Matt Simon; Anna-Lisa Doebley; Leonard D. Goldstein; Ashley Hedges; Kohta Ikegami; St ..., Proceedings of the National Academy of Sciences current issue, 2014

Germ cells are maintained in a pristine non-aging state as they proliferate over generations. Here, we show that a novel function of the Caenorhabditis elegans RNA interference proteins RNAi spreading defective (RSD)-2 and RSD-6 is to promote germ cell immortality at high temperature. rsd mutants ...

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In This Issue [This Week in PNAS]

14.10.2014 | Proceedings of the National Academy of Sciences current issue, 2014

Rapid transitions in viral DNA packing during infection Top view (Left and Center) and side view (Right) schematics of encapsidated DNA transitions with increasing temperature. Viral replication can begin only after a virus successfully ejects its genome into a host cell. To investigate how a ...

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Scaling description of the yielding transition in soft amorphous solids at zero temperature [Physics]

07.10.2014 | Jie Lin; Edan Lerner; Alberto Rosso; Matthieu Wyart, Proceedings of the National Academy of Sciences current issue, 2014

Yield stress materials flow if a sufficiently large shear stress is applied. Although such materials are ubiquitous and relevant for industry, there is no accepted microscopic description of how they yield, even in the simplest situations in which temperature is negligible and in which flow ...

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Atmospheric controls on northeast Pacific temperature variability and change, 1900-2012 [Earth, Atmospheric, and Planetary Sciences]

07.10.2014 | James A. Johnstone; Nathan J. Mantua, Proceedings of the National Academy of Sciences current issue, 2014

Over the last century, northeast Pacific coastal sea surface temperatures (SSTs) and land-based surface air temperatures (SATs) display multidecadal variations associated with the Pacific Decadal Oscillation, in addition to a warming trend of ∼0.5–1 °C. Using independent records of sea-level ...

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FBH1 affects warm temperature responses in the Arabidopsis circadian clock [Plant Biology]

07.10.2014 | Dawn H. Nagel; Jose L. Pruneda-Paz; Steve A. Kay, Proceedings of the National Academy of Sciences current issue, 2014

In Arabidopsis, the circadian clock allows the plant to coordinate daily external signals with internal processes, conferring enhanced fitness and growth vigor. Although external cues such as temperature can entrain the clock, an important feature of the clock is the ability to maintain a ...

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Requirements and limits for life in the context of exoplanets [Astronomy]

02.09.2014 | Christopher P. McKay, Proceedings of the National Academy of Sciences current issue, 2014

The requirements for life on Earth, its elemental composition, and its environmental limits provide a way to assess the habitability of exoplanets. Temperature is key both because of its influence on liquid water and because it can be directly estimated from orbital and climate models of ...

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The Holocene temperature conundrum [Environmental Sciences]

26.08.2014 | Zhengyu Liu; Jiang Zhu; Yair Rosenthal; Xu Zhang; Bette L. Otto-Bliesner; Axel Timmermann; Robin S. Smith; Gerrit Lo ..., Proceedings of the National Academy of Sciences current issue, 2014

A recent temperature reconstruction of global annual temperature shows Early Holocene warmth followed by a cooling trend through the Middle to Late Holocene [Marcott SA, et al., 2013, Science 339(6124):1198–1201]. This global cooling is puzzling because it is opposite from the expected and ...

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DELAY OF GERMINATION 1 mediates a conserved coat-dormancy mechanism for the temperature- and gibberellin-dependent control of seed germination [Plant Biology]

26.08.2014 | Kai Graeber; Ada Linkies; Tina Steinbrecher; Klaus Mummenhoff; Danuše Tarkowská; Veronika Turečková; Michael Ignatz; ..., Proceedings of the National Academy of Sciences current issue, 2014

Seed germination is an important life-cycle transition because it determines subsequent plant survival and reproductive success. To detect optimal spatiotemporal conditions for germination, seeds act as sophisticated environmental sensors integrating information such as ambient temperature. Here ...

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Hepatic mTORC1 controls locomotor activity, body temperature, and lipid metabolism through FGF21 [Physiology]

12.08.2014 | Marion Cornu; Wolfgang Oppliger; Verena Albert; Aaron M. Robitaille; Francesca Trapani; Luca Quagliata; Tobias Fuhre ..., Proceedings of the National Academy of Sciences current issue, 2014

The liver is a key metabolic organ that controls whole-body physiology in response to nutrient availability. Mammalian target of rapamycin (mTOR) is a nutrient-activated kinase and central controller of growth and metabolism that is negatively regulated by the tumor suppressor tuberous sclerosis ...

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