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Showing 1 to 12 of 22085 entries
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Regulation of methionine biosynthesis in Escherichia coli: mapping of the metJ locus and properties of a metJ plus-metJ minus diploid.

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

Su CH, Greene RC.
PMID: 5277087
Proc Natl Acad Sci U S A. 1971 Feb;68(2):367-71. doi: 10.1073/pnas.68.2.367.
Free PMC Article

MetJ(-) mutants of Escherichia coli have elevated nonrepressible levels of the enzymes of methionine biosynthesis and S-adenosylmethionine synthetase (ATP:L-methionine S-adenosyltransferase, EC 2.5.1.6). In E. coli, as in Salmonella typhimurium, the metJ locus is close to metB (95% cotransduction of...

Morphology of nematic and smectic vesicles.

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

Xing X, Shin H, Bowick MJ, Yao Z, Jia L, Li MH.
PMID: 22431595
Proc Natl Acad Sci U S A. 2012 Apr 03;109(14):5202-6. doi: 10.1073/pnas.1115684109. Epub 2012 Mar 19.

Recent experiments on vesicles formed from block copolymers with liquid-crystalline side chains reveal a rich variety of vesicle morphologies. The additional internal order ("structure") developed by these self-assembled block copolymer vesicles can lead to significantly deformed vesicles as a...

Wrinkling crystallography on spherical surfaces.

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

Brojan M, Terwagne D, Lagrange R, Reis PM.
PMID: 25535355
Proc Natl Acad Sci U S A. 2015 Jan 06;112(1):14-9. doi: 10.1073/pnas.1411559112. Epub 2014 Dec 22.

We present the results of an experimental investigation on the crystallography of the dimpled patterns obtained through wrinkling of a curved elastic system. Our macroscopic samples comprise a thin hemispherical shell bound to an equally curved compliant substrate. Under...

Organometallic rotaxane dendrimers with fourth-generation mechanically interlocked branches.

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

Wang W, Chen LJ, Wang XQ, Sun B, Li X, Zhang Y, Shi J, Yu Y, Zhang L, Liu M, Yang HB.
PMID: 25902491
Proc Natl Acad Sci U S A. 2015 May 05;112(18):5597-601. doi: 10.1073/pnas.1500489112. Epub 2015 Apr 20.

Mechanically interlocked molecules, such as catenanes, rotaxanes, and knots, have applications in information storage, switching devices, and chemical catalysis. Rotaxanes are dumbbell-shaped molecules that are threaded through a large ring, and the relative motion of the two components along...

Geologic carbon storage is unlikely to trigger large earthquakes and reactivate faults through which CO2 could leak.

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

Vilarrasa V, Carrera J.
PMID: 25902501
Proc Natl Acad Sci U S A. 2015 May 12;112(19):5938-43. doi: 10.1073/pnas.1413284112. Epub 2015 Apr 20.

Zoback and Gorelick [(2012) Proc Natl Acad Sci USA 109(26):10164-10168] have claimed that geologic carbon storage in deep saline formations is very likely to trigger large induced seismicity, which may damage the caprock and ruin the objective of keeping...

Correction to Supporting Information for Kowalewski et al., HLA ligandome analysis identifies the underlying specificities of spontaneous antileukemia immune responses in chronic lymphocytic leukemia (CLL).

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

[No authors listed]
PMID: 26527660
Proc Natl Acad Sci U S A. 2015 Nov 10;112(45):E6258-60. doi: 10.1073/pnas.1519136112. Epub 2015 Nov 02.

No abstract available.

Multifarious assembly mixtures: systems allowing retrieval of diverse stored structures.

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

Murugan A, Zeravcic Z, Brenner MP, Leibler S.
PMID: 25535383
Proc Natl Acad Sci U S A. 2015 Jan 06;112(1):54-9. doi: 10.1073/pnas.1413941112. Epub 2014 Dec 22.

Self-assembly materials are traditionally designed so that molecular or mesoscale components form a single kind of large structure. Here, we propose a scheme to create "multifarious assembly mixtures," which self-assemble many different large structures from a set of shared...

Correction for Lv et al., Ultrasensitive gas detection of large-area boron-doped graphene.

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

[No authors listed]
PMID: 26729874
Proc Natl Acad Sci U S A. 2016 Jan 19;113(3):E406. doi: 10.1073/pnas.1524658113. Epub 2016 Jan 04.

No abstract available.

Science and Culture: Serious science education, with a chuckle.

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

Dance A.
PMID: 26330602
Proc Natl Acad Sci U S A. 2015 Sep 01;112(35):10819-20. doi: 10.1073/pnas.1509008112.

No abstract available.

Achiral symmetry breaking and positive Gaussian modulus lead to scalloped colloidal membranes.

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

Gibaud T, Kaplan CN, Sharma P, Zakhary MJ, Ward A, Oldenbourg R, Meyer RB, Kamien RD, Powers TR, Dogic Z.
PMID: 28411214
Proc Natl Acad Sci U S A. 2017 Apr 25;114(17):E3376-E3384. doi: 10.1073/pnas.1617043114. Epub 2017 Apr 14.

In the presence of a nonadsorbing polymer, monodisperse rod-like particles assemble into colloidal membranes, which are one-rod-length-thick liquid-like monolayers of aligned rods. Unlike 3D edgeless bilayer vesicles, colloidal monolayer membranes form open structures with an exposed edge, thus presenting...

Transcriptional errors and the drift barrier.

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

McCandlish DM, Plotkin JB.
PMID: 26966235
Proc Natl Acad Sci U S A. 2016 Mar 22;113(12):3136-8. doi: 10.1073/pnas.1601785113. Epub 2016 Mar 10.

No abstract available.

Experimental test of the viscous anisotropy hypothesis for partially molten rocks.

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

Qi C, Kohlstedt DL, Katz RF, Takei Y.
PMID: 26417107
Proc Natl Acad Sci U S A. 2015 Oct 13;112(41):12616-20. doi: 10.1073/pnas.1513790112. Epub 2015 Sep 28.

Chemical differentiation of rocky planets occurs by melt segregation away from the region of melting. The mechanics of this process, however, are complex and incompletely understood. In partially molten rocks undergoing shear deformation, melt pockets between grains align coherently...

Showing 1 to 12 of 22085 entries