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355 Aktuelle Fachpublikationen zum Thema temperature

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Sex determination by multiple sex chromosomes in Xenopus tropicalis [Genetics]

25.08.2015 | Manfred Schartl, Proceedings of the National Academy of Sciences current issue, 2015

Sex determination shows a great diversity of mechanisms, ranging from temperature and other environmental cues to strict chromosomal control over this process. In the case of genetic sex determination, this variability is linked to a similarly high variation of sex chromosome differentiation. In ...

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Reply to Luo et al.: Robustness of causal effects of galactic cosmic rays on interannual variation in global temperature [Physical Sciences]

25.08.2015 | Hao Ye; George Sugihara; Ethan R. Deyle; Robert M. May; Kyle Swanson; Anastasios A. Tsonis, Proceedings of the National Academy of Sciences current issue, 2015

Tsonis et al. (1) recently used convergent cross mapping (CCM) (2) to identify a causal relationship between cosmic rays (CRs) and interannual variation in global temperature (ΔGT). Subsequently, Luo et al. (3) questioned this finding using the Clark implementation of CCM (version 1.0 of the ...

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Questionable dynamical evidence for causality between galactic cosmic rays and interannual variation in global temperature [Physical Sciences]

25.08.2015 | Ming Luo; Holger Kantz; Ngar-Cheung Lau; Wenwen Huang; Yu Zhou, Proceedings of the National Academy of Sciences current issue, 2015

Tsonis et al. (1) claim a significant causality between cosmic rays (CRs) and interannual variation in global temperature (ΔGT) by using convergent cross mapping (CCM) (2). Their results are potentially helpful to model the climate system. However, we are unable to reproduce their results and ...

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Bayesian chronological analyses consistent with synchronous age of 12,835-12,735 Cal B.P. for Younger Dryas boundary on four continents [Earth, Atmospheric, and Planetary Sciences]

11.08.2015 | James P. Kennett; Douglas J. Kennett; Brendan J. Culleton; J. Emili Aura Tortosa; James L. Bischoff; Ted E. Bunch; I ..., Proceedings of the National Academy of Sciences current issue, 2015

The Younger Dryas impact hypothesis posits that a cosmic impact across much of the Northern Hemisphere deposited the Younger Dryas boundary (YDB) layer, containing peak abundances in a variable assemblage of proxies, including magnetic and glassy impact-related spherules, high-temperature ...

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Fragile charge order in the nonsuperconducting ground state of the underdoped high-temperature superconductors [Physics]

04.08.2015 | B. S. Tan; N. Harrison; Z. Zhu; F. Balakirev; B. J. Ramshaw; A. Srivastava; S. A. Sabok; B. Dabrowski; G. G. Lonzari ..., Proceedings of the National Academy of Sciences current issue, 2015

The normal state in the hole underdoped copper oxide superconductors has proven to be a source of mystery for decades. The measurement of a small Fermi surface by quantum oscillations on suppression of superconductivity by high applied magnetic fields, together with complementary spectroscopic ...

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Enhanced enstrophy generation for turbulent convection in low-Prandtl-number fluids [Applied Physical Sciences]

04.08.2015 | Jörg Schumacher; Paul Götzfried; Janet D. Scheel, Proceedings of the National Academy of Sciences current issue, 2015

Turbulent convection is often present in liquids with a kinematic viscosity much smaller than the diffusivity of the temperature. Here we reveal why these convection flows obey a much stronger level of fluid turbulence than those in which kinematic viscosity and thermal diffusivity are the same; ...

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The spliceosome assembly factor GEMIN2 attenuates the effects of temperature on alternative splicing and circadian rhythms [Genetics]

28.07.2015 | Rubén Gustavo Schlaen; Estefanía Mancini; Sabrina Elena Sanchez; Soledad Perez-Santángelo; Matías L. Rugnone; Craig ..., Proceedings of the National Academy of Sciences current issue, 2015

The mechanisms by which poikilothermic organisms ensure that biological processes are robust to temperature changes are largely unknown. Temperature compensation, the ability of circadian rhythms to maintain a relatively constant period over the broad range of temperatures resulting from seasonal ...

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Evaporative cooling over the Tibetan Plateau induced by vegetation growth [Environmental Sciences]

28.07.2015 | Miaogen Shen; Shilong Piao; Su-Jong Jeong; Liming Zhou; Zhenzhong Zeng; Philippe Ciais; Deliang Chen; Mengtian Huang ..., Proceedings of the National Academy of Sciences current issue, 2015

In the Arctic, climate warming enhances vegetation activity by extending the length of the growing season and intensifying maximum rates of productivity. In turn, increased vegetation productivity reduces albedo, which causes a positive feedback on temperature. Over the Tibetan Plateau (TP), ...

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Absence of Jahn-Teller transition in the hexagonal Ba3CuSb2O9 single crystal [Physics]

28.07.2015 | Naoyuki Katayama; Kenta Kimura; Yibo Han; Joji Nasu; Natalia Drichko; Yoshiki Nakanishi; Mario Halim; Yuki Ishiguro; ..., Proceedings of the National Academy of Sciences current issue, 2015

With decreasing temperature, liquids generally freeze into a solid state, losing entropy in the process. However, exceptions to this trend exist, such as quantum liquids, which may remain unfrozen down to absolute zero owing to strong quantum entanglement effects that stabilize a disordered state ...

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Photodrive of magnetic bubbles via magnetoelastic waves [Physics]

21.07.2015 | Naoki Ogawa; Wataru Koshibae; Aron Jonathan Beekman; Naoto Nagaosa; Masashi Kubota; Masashi Kawasaki; Yoshinori Tokura, Proceedings of the National Academy of Sciences current issue, 2015

Precise control of magnetic domain walls continues to be a central topic in the field of spintronics to boost infotech, logic, and memory applications. One way is to drive the domain wall by current in metals. In insulators, the incoherent flow of phonons and magnons induced by the temperature ...

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