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Showing 13 to 24 of 22085 entries
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Shape-programmable magnetic soft matter.

Proceedings of the National Academy of Sciences of the United States of America

Lum GZ, Ye Z, Dong X, Marvi H, Erin O, Hu W, Sitti M.
PMID: 27671658
Proc Natl Acad Sci U S A. 2016 Oct 11;113(41):E6007-E6015. doi: 10.1073/pnas.1608193113. Epub 2016 Sep 26.

Shape-programmable matter is a class of active materials whose geometry can be controlled to potentially achieve mechanical functionalities beyond those of traditional machines. Among these materials, magnetically actuated matter is particularly promising for achieving complex time-varying shapes at small...

Carbon isotopes characterize rapid changes in atmospheric carbon dioxide during the last deglaciation.

Proceedings of the National Academy of Sciences of the United States of America

Bauska TK, Baggenstos D, Brook EJ, Mix AC, Marcott SA, Petrenko VV, Schaefer H, Severinghaus JP, Lee JE.
PMID: 26976561
Proc Natl Acad Sci U S A. 2016 Mar 29;113(13):3465-70. doi: 10.1073/pnas.1513868113. Epub 2016 Mar 14.

An understanding of the mechanisms that control CO2 change during glacial-interglacial cycles remains elusive. Here we help to constrain changing sources with a high-precision, high-resolution deglacial record of the stable isotopic composition of carbon in CO2(δ(13)C-CO2) in air extracted...

Anticipating societal collapse; Hints from the Stone Age.

Proceedings of the National Academy of Sciences of the United States of America

Scheffer M.
PMID: 27638201
Proc Natl Acad Sci U S A. 2016 Sep 27;113(39):10733-5. doi: 10.1073/pnas.1612728113. Epub 2016 Sep 16.

No abstract available.

Tectonic controls on the long-term carbon isotope mass balance.

Proceedings of the National Academy of Sciences of the United States of America

Shields GA, Mills BJW.
PMID: 28396434
Proc Natl Acad Sci U S A. 2017 Apr 25;114(17):4318-4323. doi: 10.1073/pnas.1614506114. Epub 2017 Apr 10.

The long-term, steady-state marine carbon isotope record reflects changes to the proportional burial rate of organic carbon relative to total carbon on a global scale. For this reason, times of high δ

Structural basis of Tie2 activation and Tie2/Tie1 heterodimerization.

Proceedings of the National Academy of Sciences of the United States of America

Leppänen VM, Saharinen P, Alitalo K.
PMID: 28396439
Proc Natl Acad Sci U S A. 2017 Apr 25;114(17):4376-4381. doi: 10.1073/pnas.1616166114. Epub 2017 Apr 10.

The endothelial cell (EC)-specific receptor tyrosine kinases Tie1 and Tie2 are necessary for the remodeling and maturation of blood and lymphatic vessels. Angiopoietin-1 (Ang1) growth factor is a Tie2 agonist, whereas Ang2 functions as a context-dependent agonist/antagonist. The orphan...

Warmer climate squeezes aquatic predators out of their preferred habitat.

Proceedings of the National Academy of Sciences of the United States of America

Schindler DE.
PMID: 28864532
Proc Natl Acad Sci U S A. 2017 Sep 12;114(37):9764-9765. doi: 10.1073/pnas.1712818114. Epub 2017 Sep 01.

No abstract available.

Reply to Sun et al.: Confirming the evidence for Late Oligocene-Early Miocene birth of the Taklimakan Desert.

Proceedings of the National Academy of Sciences of the United States of America

Zheng H, Wei X, Tada R, Clift PD, Wang B, Jourdan F, Wang P, He M.
PMID: 26430244
Proc Natl Acad Sci U S A. 2015 Oct 13;112(41):E5558-9. doi: 10.1073/pnas.1517735112. Epub 2015 Oct 01.

No abstract available.

Refuting the evidence for an earlier birth of the Taklimakan Desert.

Proceedings of the National Academy of Sciences of the United States of America

Sun J, Alloway B, Fang X, Windley BF.
PMID: 26430245
Proc Natl Acad Sci U S A. 2015 Oct 13;112(41):E5556-7. doi: 10.1073/pnas.1517525112. Epub 2015 Oct 01.

No abstract available.

QnAs with Nancy A. Lynch.

Proceedings of the National Academy of Sciences of the United States of America

Doctrow B.
PMID: 28928144
Proc Natl Acad Sci U S A. 2017 Oct 03;114(40):10512-10513. doi: 10.1073/pnas.1714383114. Epub 2017 Sep 19.

No abstract available.

Disconnecting structure and dynamics in glassy thin films.

Proceedings of the National Academy of Sciences of the United States of America

Sussman DM, Schoenholz SS, Cubuk ED, Liu AJ.
PMID: 28928147
Proc Natl Acad Sci U S A. 2017 Oct 03;114(40):10601-10605. doi: 10.1073/pnas.1703927114. Epub 2017 Sep 19.

Nanometrically thin glassy films depart strikingly from the behavior of their bulk counterparts. We investigate whether the dynamical differences between a bulk and thin film polymeric glass former can be understood by differences in local microscopic structure. Machine learning...

Topological semimetal in honeycomb lattice LnSI.

Proceedings of the National Academy of Sciences of the United States of America

Nie S, Xu G, Prinz FB, Zhang SC.
PMID: 28928149
Proc Natl Acad Sci U S A. 2017 Oct 03;114(40):10596-10600. doi: 10.1073/pnas.1713261114. Epub 2017 Sep 19.

Recognized as elementary particles in the standard model, Weyl fermions in condensed matter have received growing attention. However, most of the previously reported Weyl semimetals exhibit rather complicated electronic structures that, in turn, may have raised questions regarding the...

Ancient lipids document continuity in the use of early hunter-gatherer pottery through 9,000 years of Japanese prehistory.

Proceedings of the National Academy of Sciences of the United States of America

Lucquin A, Gibbs K, Uchiyama J, Saul H, Ajimoto M, Eley Y, Radini A, Heron CP, Shoda S, Nishida Y, Lundy J, Jordan P, Isaksson S, Craig OE.
PMID: 27001829
Proc Natl Acad Sci U S A. 2016 Apr 12;113(15):3991-6. doi: 10.1073/pnas.1522908113. Epub 2016 Mar 21.

The earliest pots in the world are from East Asia and date to the Late Pleistocene. However, ceramic vessels were only produced in large numbers during the warmer and more stable climatic conditions of the Holocene. It has long...

Showing 13 to 24 of 22085 entries