T(r)opical Dyson-Schwinger Equations

Chang, Lei; Cloët, Ian C.; Roberts, Craig D.; Roberts, H. L. L.

doi:10.1063/1.3587594

Cited by 13 publications

(17 citation statements)

References 44 publications

(61 reference statements)

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“…Five hundred microliters of the mix was transferred to a 1-cm diameter glass cuvette for absorbance measurement at 280 nm. Lignin content was calculated using the extinction coefficient 23.35 mg/cm/L for Arabidopsis (Chang et al, 2008) using Beer's law (A = elc).…”

Section: Lignin Analysis By Acetyl Bromide Methodsmentioning

confidence: 99%

SG2-Type R2R3-MYB Transcription Factor MYB15 Controls Defense-Induced Lignification and Basal Immunity in Arabidopsis

et al. 2017

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Lignification of cell wall appositions is a conserved basal defense mechanism in the plant innate immune response. However, the genetic pathway controlling defense-induced lignification remains unknown. Here, we demonstrate the SG2-type R2R3-MYB transcription factor MYB15 as a regulator of defense-induced lignification and basal immunity. Loss of MYB15 reduces the content but not the composition of defense-induced lignin, whereas constitutive expression of increases lignin content independently of immune activation. Comparative transcriptional and metabolomics analyses implicate as necessary for the defense-induced synthesis of guaiacyl lignin and the basal synthesis of the coumarin metabolite scopoletin. MYB15 directly binds to the secondary wall MYB-responsive element consensus sequence, which encompasses the AC elements, to drive lignification. The and lignin biosynthetic mutants show increased susceptibility to the bacterial pathogen , consistent with defense-induced lignin having a major role in basal immunity. A scopoletin biosynthetic mutant also shows increased susceptibility independently of immune activation, consistent with a role in preformed defense. Our results support a role for phenylalanine-derived small molecules in preformed and inducible Arabidopsis defense, a role previously dominated by tryptophan-derived small molecules. Understanding the regulatory network linking lignin biosynthesis to plant growth and defense will help lignin engineering efforts to improve the production of biofuels and aromatic industrial products as well as increase disease resistance in energy and agricultural crops.

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Section: Lignin Analysis By Acetyl Bromide Methodsmentioning

confidence: 99%

SG2-Type R2R3-MYB Transcription Factor MYB15 Controls Defense-Induced Lignification and Basal Immunity in Arabidopsis

et al. 2017

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“…The disagreement at low Q 2 is attributed to the omission of meson cloud effects. The addition of dynamically generated, momentum-dependent dressed-quark anomalous magnetic moments [99] that become large at infrared momenta improves the description of R at low Q 2 . The three-quark model calculation [18] agrees with the data at low Q 2 , but underpredicts the data at higher Q 2 , becoming numerically unreliable for Q 2 7 GeV 2 .…”

Section: Dyson-schwinger Equationsmentioning

confidence: 99%

“…The results of [17] (Cloët09) are shown for a particular choice of the diquark charge radius. The curve from [99] (Chang11) is that of [17] with the addition of dressed quark anomalous magnetic moments. The results of [18] (Eichmann11) are shown for two values of η, showing the weak sensitivity of the form factor results to this parameter.…”

Section: Dyson-schwinger Equationsmentioning

confidence: 99%

Final analysis of proton form factor ratio data atQ2=4.0, 4.8, and 5.6 GeV2

Puckett¹,

Brash²,

Gayou³

et al. 2012

Phys. Rev. C

164

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Precise measurements of the proton electromagnetic form factor ratio R = µpG p E /G p M using the polarization transfer method at Jefferson Lab have revolutionized the understanding of nucleon structure by revealing the strong decrease of R with momentum transfer Q 2 for Q 2 1 GeV 2 , in strong disagreement with previous extractions of R from cross section measurements. In particular, the polarization transfer results have exposed the limits of applicability of the one-photon-exchange approximation and highlighted the role of quark orbital angular momentum in the nucleon structure. The GEp-II experiment in Jefferson Lab's Hall A measured R at four Q 2 values in the range 3.5 GeV 2 ≤ Q 2 ≤ 5.6 GeV 2 . A possible discrepancy between the originally published GEp-II results and more recent measurements at higher Q 2 motivated a new analysis of the GEp-II data. This article presents the final results of the GEp-II experiment, including details of the new analysis, an expanded description of the apparatus and an overview of theoretical progress since the original publication. The key result of the final analysis is a systematic increase in the results for R, improving the consistency of the polarization transfer data in the high-Q 2 region. This increase is the result of an improved selection of elastic events which largely removes the systematic effect of the inelastic contamination, underestimated by the original analysis. * Corresponding author: puckett@jlab.org 2

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“…These results are stimulating a reanalysis of hadron elastic and transition electromagnetic form factors [185,199], and the hadron spectrum, results of which will be described below. Furthermore, given the magnitude of the muon "gµ − 2 anomaly" and its assumed importance as an harbinger of physics beyond the Standard Model [200], it might also be worthwhile to make a quantitative estimate of the contribution to gµ − 2 from the quark's DCSB-induced anomalous moments following, e.g., the computational pattern for the hadronic light-by-light scattering component of the photon polarization tensor indicated in Ref.…”

Section: Quark Anomalous Magnetic Momentsmentioning

confidence: 98%

Strong QCD and Dyson–Schwinger equations

Roberts

2015

IRMA Lectures in Mathematics and Theoretical Physics

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The real-world properties of quantum chromodynamics (QCD) -the stronglyinteracting piece of the Standard Model -are dominated by two emergent phenomena: confinement; namely, the theory's elementary degrees-of-freedom -quarks and gluonshave never been detected in isolation; and dynamical chiral symmetry breaking (DCSB), which is a remarkably effective mass generating mechanism, responsible for the mass of more than 98% of visible matter in the Universe. These phenomena are not apparent in the formulae that define QCD, yet they play a principal role in determining Nature's observable characteristics. Much remains to be learnt before confinement can properly be understood. On the other hand,the last decade has seen important progress in the use of relativistic quantum field theory, so that we can now explain the origin of DCSB and are beginning to demonstrate its far-reaching consequences. Dyson-Schwinger equations have played a critical role in these advances. These lecture notes provide an introduction to Dyson-Schwinger equations (DSEs), QCD and hadron physics, and illustrate the use of DSEs to predict phenomena that are truly observable.2010 Mathematics Subject Classification: 81Q40, 81T16, 81T18

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T(r)opical Dyson-Schwinger Equations

Cited by 13 publications

References 44 publications

SG2-Type R2R3-MYB Transcription Factor MYB15 Controls Defense-Induced Lignification and Basal Immunity in Arabidopsis

SG2-Type R2R3-MYB Transcription Factor MYB15 Controls Defense-Induced Lignification and Basal Immunity in Arabidopsis

Final analysis of proton form factor ratio data atQ2=4.0, 4.8, and 5.6 GeV2

Strong QCD and Dyson–Schwinger equations

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