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  • 1
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    Geocenter location and variations in earth orientation using Global Positioning System measurements (1993)
    In:  J. Geophys. Res., San Francisco, Pergamon, vol. 98, no. 1, pp. 4611-4617, pp. L13314, (ISSN: 1340-4202)
    Details
    Publication Date: 1993
    Keywords: Global Positioning System ; Geodesy ; Crustal deformation (cf. Earthquake precursor: deformation or strain) ; JGR
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    BIBLIOGRAPHY SEISMOLOGY
  • 2
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    Scattering from non-Gaussian randomly rough surfaces - cylindrical case (1988)
    In:  IEEE Trans. on Geoscience and Remote Sensing, Kunming, China, Elsevier, vol. 26, no. 2, pp. 790-798, pp. 2481, (ISSN: 1340-4202)
    Details
    Publication Date: 1988
    Keywords: Scattering ; Inhomogeneity
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    BIBLIOGRAPHY SEISMOLOGY
  • 3
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    Neisseria conserved protein DMP19 is a DNA mimic protein that prevents DNA binding to a hypothetical nitrogen-response transcription factor (2012)
    Oxford University Press
    Details
    Publication Date: 2012-06-28
    Description: DNA mimic proteins occupy the DNA binding sites of DNA-binding proteins, and prevent these sites from being accessed by DNA. We show here that the Neisseria conserved hypothetical protein DMP19 acts as a DNA mimic. The crystal structure of DMP19 shows a dsDNA-like negative charge distribution on the surface, suggesting that this protein should be added to the short list of known DNA mimic proteins. The crystal structure of another related protein, NHTF ( Neisseria hypothetical transcription factor), provides evidence that it is a member of the xenobiotic-response element (XRE) family of transcriptional factors. NHTF binds to a palindromic DNA sequence containing a 5'-TGTNAN 11 TNACA-3' recognition box that controls the expression of an NHTF-related operon in which the conserved nitrogen-response protein [i.e. (Protein-PII) uridylyltransferase] is encoded. The complementary surface charges between DMP19 and NHTF suggest specific charge–charge interaction. In a DNA-binding assay, we found that DMP19 can prevent NHTF from binding to its DNA-binding sites. Finally, we used an in situ gene regulation assay to provide evidence that NHTF is a repressor of its down-stream genes and that DMP19 can neutralize this effect. We therefore conclude that the interaction of DMP19 and NHTF provides a novel gene regulation mechanism in Neisseria spps.
    Print ISSN: 0305-1048
    Electronic ISSN: 1362-4962
    Topics: Biology
    Published by Oxford University Press
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  • 4
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    Recovery of Terephthalic Acid from Alkali Reduction Wastewater by Cooling Crystallization (2011)
    Wiley
    Details
    Publication Date: 2011-09-09
    Description: A process for the recovery and purification of terephthalic acid (TA) from alkali reduction wastewater is reported. TA was first precipitated from alkali reduction wastewater by acidification with sulfuric acid, and then the produced crude TA was dissolved in dimethylacetamide (DMA) so that crude TA could be purified from the solution by cooling crystallization. The results indicated that acidification could reduce the chemical oxygen demand of the wastewater by 83 %, and the purity of TA by crystallization could reach 99.91 %. A correlation was proposed in describing the solubility of crude TA in DMA from 303.4 to 358.65 K, which gives a mean relative discrepancy of less than 1.14 %. The cooling rate of the mother liquor had a large influence on the crystal size distribution. At an average cooling rate of 1.18 K min –1 , the particle size distribution of TA was narrow and the average size was about 100 μm. In a bench-scale study, it was demonstrated that the crystallized product can be recycled as the raw material for polyethylene terephthalate production. Terephthalic acid (TA) was successfully recovered and purified from alkali reduction wastewater, by acidification with sulfuric acid and by cooling crystallization with dimethylacetamide. The chemical oxygen demand of the wastewater was effectively reduced, and TA with a purity of 99.91 % was obtained.
    Print ISSN: 0930-7516
    Electronic ISSN: 1521-4125
    Topics: Chemistry and Pharmacology , Process Engineering, Biotechnology, Nutrition Technology
    Published by Wiley
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  • 5
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    Scale-invariant magnetoresistance in a cuprate superconductor (2018)
    American Association for the Advancement of Science (AAAS)
    In: Science
    Details
    Publication Date: 2018-08-03
    Description: The anomalous metallic state in the high-temperature superconducting cuprates is masked by superconductivity near a quantum critical point. Applying high magnetic fields to suppress superconductivity has enabled detailed studies of the normal state, yet the direct effect of strong magnetic fields on the metallic state is poorly understood. We report the high-field magnetoresistance of thin-film La 2– x Sr x CuO 4 cuprate in the vicinity of the critical doping, 0.161 ≤ p ≤ 0.190. We find that the metallic state exposed by suppressing superconductivity is characterized by magnetoresistance that is linear in magnetic fields up to 80 tesla. The magnitude of the linear-in-field resistivity mirrors the magnitude and doping evolution of the well-known linear-in-temperature resistivity that has been associated with quantum criticality in high-temperature superconductors.
    Keywords: Physics
    Print ISSN: 0036-8075
    Electronic ISSN: 1095-9203
    Topics: Biology , Chemistry and Pharmacology , Geosciences , Computer Science , Medicine , Natural Sciences in General , Physics
    Published by American Association for the Advancement of Science (AAAS)
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  • 6
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    Tet proteins can convert 5-methylcytosine to 5-formylcytosine and 5-carboxylcytosine (2011)
    American Association for the Advancement of Science (AAAS)
    Details
    Publication Date: 2011-07-23
    Description: 5-methylcytosine (5mC) in DNA plays an important role in gene expression, genomic imprinting, and suppression of transposable elements. 5mC can be converted to 5-hydroxymethylcytosine (5hmC) by the Tet (ten eleven translocation) proteins. Here, we show that, in addition to 5hmC, the Tet proteins can generate 5-formylcytosine (5fC) and 5-carboxylcytosine (5caC) from 5mC in an enzymatic activity-dependent manner. Furthermore, we reveal the presence of 5fC and 5caC in genomic DNA of mouse embryonic stem cells and mouse organs. The genomic content of 5hmC, 5fC, and 5caC can be increased or reduced through overexpression or depletion of Tet proteins. Thus, we identify two previously unknown cytosine derivatives in genomic DNA as the products of Tet proteins. Our study raises the possibility that DNA demethylation may occur through Tet-catalyzed oxidation followed by decarboxylation.〈br /〉〈br /〉〈a href="https://www.ncbi.nlm.nih.gov/pmc/articles/PMC3495246/" target="_blank"〉〈img src="https://static.pubmed.gov/portal/portal3rc.fcgi/4089621/img/3977009" border="0"〉〈/a〉   〈a href="https://www.ncbi.nlm.nih.gov/pmc/articles/PMC3495246/" target="_blank"〉This paper as free author manuscript - peer-reviewed and accepted for publication〈/a〉〈br /〉〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Ito, Shinsuke -- Shen, Li -- Dai, Qing -- Wu, Susan C -- Collins, Leonard B -- Swenberg, James A -- He, Chuan -- Zhang, Yi -- GM071440/GM/NIGMS NIH HHS/ -- GM68804/GM/NIGMS NIH HHS/ -- P30 ES010126/ES/NIEHS NIH HHS/ -- P30 ES010126-11/ES/NIEHS NIH HHS/ -- P30ES10126/ES/NIEHS NIH HHS/ -- P42 ES005948/ES/NIEHS NIH HHS/ -- P42 ES005948-17/ES/NIEHS NIH HHS/ -- P42ES5948/ES/NIEHS NIH HHS/ -- R01 GM068804/GM/NIGMS NIH HHS/ -- U01 DK089565/DK/NIDDK NIH HHS/ -- Howard Hughes Medical Institute/ -- New York, N.Y. -- Science. 2011 Sep 2;333(6047):1300-3. doi: 10.1126/science.1210597. Epub 2011 Jul 21.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉Howard Hughes Medical Institute and Department of Biochemistry and Biophysics, University of North Carolina at Chapel Hill, Chapel Hill, NC 27599-7295, USA.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/21778364" target="_blank"〉PubMed〈/a〉
    Keywords: 5-Methylcytosine/*metabolism ; Animals ; Cell Line ; Cytosine/*analogs & derivatives/metabolism ; DNA/*metabolism ; DNA Methylation ; DNA-Binding Proteins/genetics/*metabolism ; Embryonic Stem Cells/metabolism ; Humans ; Mice ; Oxidation-Reduction ; Proto-Oncogene Proteins/genetics/*metabolism ; Recombinant Fusion Proteins/metabolism
    Print ISSN: 0036-8075
    Electronic ISSN: 1095-9203
    Topics: Biology , Chemistry and Pharmacology , Computer Science , Medicine , Natural Sciences in General , Physics
    Published by American Association for the Advancement of Science (AAAS)
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  • 7
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    Pressure tuning the Fermi surface topology of the Weyl semimetal NbP (2016)
    American Physical Society (APS)
    Details
    Publication Date: 2016-05-04
    Description: Author(s): R. D. dos Reis, S. C. Wu, Y. Sun, M. O. Ajeesh, C. Shekhar, M. Schmidt, C. Felser, B. Yan, and M. Nicklas We report on the pressure evolution of the Fermi surface topology of the Weyl semimetal NbP, probed by Shubnikov–de Haas oscillations in the magnetoresistance combined with ab initio calculations of the band structure. Although we observe a drastic effect on the amplitudes of the quantum oscillation… [Phys. Rev. B 93, 205102] Published Mon May 02, 2016
    Keywords: Electronic structure and strongly correlated systems
    Print ISSN: 1098-0121
    Electronic ISSN: 1095-3795
    Topics: Physics
    Published by American Physical Society (APS)
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  • 8
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    Chiral Weyl Pockets and Fermi Surface Topology of the Weyl Semimetal TaAs (2016)
    American Physical Society (APS)
    Details
    Publication Date: 2016-09-29
    Description: Author(s): F. Arnold, M. Naumann, S.-C. Wu, Y. Sun, M. Schmidt, H. Borrmann, C. Felser, B. Yan, and E. Hassinger Tantalum arsenide is a member of the noncentrosymmetric monopnictides, which are putative Weyl semimetals. In these materials, three-dimensional chiral massless quasiparticles, the so-called Weyl fermions, are predicted to induce novel quantum mechanical phenomena, such as the chiral anomaly and top… [Phys. Rev. Lett. 117, 146401] Published Wed Sep 28, 2016
    Keywords: Condensed Matter: Electronic Properties, etc.
    Print ISSN: 0031-9007
    Electronic ISSN: 1079-7114
    Topics: Physics
    Published by American Physical Society (APS)
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  • 9
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    Observation of Landau quantization and standing waves in HfSiS (2018)
    American Physical Society (APS)
    Details
    Publication Date: 2018-05-22
    Description: Author(s): L. Jiao, Q. N. Xu, Y. P. Qi, S.-C. Wu, Y. Sun, C. Felser, and S. Wirth Recently, HfSiS was found to be a new type of Dirac semimetal with a line of Dirac nodes in the band structure. Meanwhile, Rashba-split surface states are also pronounced in this compound. Here we report a systematic study of HfSiS by scanning tunneling microscopy/spectroscopy at low temperature and... [Phys. Rev. B 97, 195137] Published Mon May 21, 2018
    Keywords: Electronic structure and strongly correlated systems
    Print ISSN: 1098-0121
    Electronic ISSN: 1095-3795
    Topics: Physics
    Published by American Physical Society (APS)
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  • 10
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    Implementation of the velocity scaling method for elliptic restricted three-body problems (2016)
    Oxford University Press
    Details
    Publication Date: 2016-09-18
    Description: The velocity scaling method of Ma et al., as an extension of Nacozy's manifold correction scheme, can frequently take the solution of a numerical integration back to a surface determined by an integral of the equations of motion. An elliptic restricted three-body Hamiltonian of the Sun, major and minor planets in a rotating frame is explicitly dependent on time and, therefore, is not a conserved quantity. In this case, there is no Jacobi conservative integral available but there is a Jacobi non-conservative integral. This seems to be an obstacle to applying the velocity scaling correction method. Here are two points about an effective way to overcome this obstacle. First, because of the Hamiltonian having momentum- and coordinate-dependent terms associated with the contributions from the non-inertial frame, a scaling correction factor should be used to act on the velocities in the Jacobi non-conservative integral although the momenta are integration variables. Secondly, at each integration step, the value of the Hamiltonian obtained from an integral invariant relation is referred to as a more accurate reference value; the scaling factor versus the velocities is given by constraining the numerical solution to remain on the Jacobi non-conservative integral along this reference value. Numerical experiments show that a lower-order non-symplectic algorithm plus the velocity scaling scheme demonstrates good numerical performance in suppressing the rapid growth of integration errors, compared to the lower-order uncorrected algorithm. The correction scheme is powerful for eliminating spurious non-physical chaos due to integration errors. It is found that a larger eccentricity of the giant planet will increase the possibility of chaos or escape of the asteroid.
    Print ISSN: 0035-8711
    Electronic ISSN: 1365-2966
    Topics: Physics
    Published by Oxford University Press
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