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Articles 1 - 14 of 14
Full-Text Articles in Physics
The Role Of Matp, Zapa And Zapb In Chromosomal Organization And Dynamics In Escherichia Coli, Jaana Männik, Daniel E. Castillo, Da Yang, George Siopsis, Jaan Männik
The Role Of Matp, Zapa And Zapb In Chromosomal Organization And Dynamics In Escherichia Coli, Jaana Männik, Daniel E. Castillo, Da Yang, George Siopsis, Jaan Männik
Physics and Astronomy Publications and Other Works
Despite extensive research over several decades, a comprehensive view of how the Escherichia coli chromosome is organized within the nucleoid, and how two daughter chromosomes segregate has yet to emerge. Here we investigate the role of the MatP, ZapA and ZapB proteins in organizing the replication terminus (Ter) region and in the chromosomal segregation process. Quantitative image analysis of the fluorescently labeled Ter region shows that the replication terminus attaches to the divisome in a single segment along the perimeter of the cell in a MatP, ZapA and ZapB-dependent manner. The attachment does not significantly affect the bulk chromosome segregation …
Evidence For Divisome Localization Mechanisms Independent Of The Min System And Slma In Escherichia Coli, Matthew W. Bailey, Paola Bisicchia, Boyd T. Warren, David J. Sherratt, Jaan Mannik
Evidence For Divisome Localization Mechanisms Independent Of The Min System And Slma In Escherichia Coli, Matthew W. Bailey, Paola Bisicchia, Boyd T. Warren, David J. Sherratt, Jaan Mannik
Physics and Astronomy Publications and Other Works
Cell division in Escherichia coli starts with assembly of FtsZ protofilaments into a ring-like structure, the Z-ring. Positioning of the Z-ring at midcell is thought to be coordinated by two regulatory systems, nucleoid occlusion and the Min system. In E. coli, nucleoid occlusion is mediated by the SlmA proteins. Here, we address the question of whether there are additional positioning systems that are capable of localizing the E. coli divisome with respect to the cell center. Using quantitative fluorescence imaging we show that slow growing cells lacking functional Min and SlmA nucleoid occlusion systems continue to divide preferentially at …
Diamond Detector Beam Tests, Stefan M Spanier
Diamond Detector Beam Tests, Stefan M Spanier
Physics and Astronomy Publications and Other Works
Photos of Application and Tests of diamond pixel detectors at UTK.
Diamond Particle Detectors, Stefan M Spanier, Matt Hollingsworth
Diamond Particle Detectors, Stefan M Spanier, Matt Hollingsworth
Physics and Astronomy Publications and Other Works
Poster presented at the IEEE Conference 2010 in Knoxville. It shows results for charged particle tracking using single-crystalline diamond pixel detectors.
Note On Scalar Mesons, C. Amsler, T. Gutsche, Stefan M Spanier, N.A. Tornqvist
Note On Scalar Mesons, C. Amsler, T. Gutsche, Stefan M Spanier, N.A. Tornqvist
Physics and Astronomy Publications and Other Works
Review article about the light scalar mesons, experimental and theoretical advances during the previous two years. The nature of several scalar mesons is controversial and they include exotic objects like glue-balls. The note is published in the Review of Particle Properties.
Studies Of Mono-Crystalline Cvd Diamond Pixel Detectors, Stefan M Spanier, Matt Hollingsworth
Studies Of Mono-Crystalline Cvd Diamond Pixel Detectors, Stefan M Spanier, Matt Hollingsworth
Physics and Astronomy Publications and Other Works
Proceedings of a presentation at the International Pixel 2010 Conference, Grindelwald, Switzerland.
Correlations In Proton-Proton Collisions At The Lhc, The Cms Collaboration
Correlations In Proton-Proton Collisions At The Lhc, The Cms Collaboration
Physics and Astronomy Publications and Other Works
Results on two-particle angular correlations for charged particles emitted in proton proton collisions at center-of-mass energies of 0.9, 2.36, and 7 TeV are presented, using data collected with the CMS detector over a broad range of pseudo-rapidity (h) and azimuthal angle (f). Short-range correlations in Dh, which are studied in minimum bias events, are characterized using a simple “independent cluster” parametrization in order to quantify their strength (cluster size) and their extent in h (cluster decay width). Long-range azimuthal correlations are studied differentially as a function of charged particle multiplicity and particle transverse momentum using a 980 nb^-1 data set …
Cms Tracking Performance Results From Early Lhc Operation, The Cms Collaboration
Cms Tracking Performance Results From Early Lhc Operation, The Cms Collaboration
Physics and Astronomy Publications and Other Works
The first LHC pp collisions at centre-of-mass energies of 0.9 and 2.36 TeV were recorded by the CMS detector in December 2009. The trajectories of charged particles produced in the collisions were reconstructed using the all-silicon Tracker and their momenta were measured in the 3.8 T axial magnetic field. Results from the Tracker commissioning are presented including studies of timing, efficiency, signal-to-noise, resolution, and ionization energy. Reconstructed tracks are used to benchmark the performance in terms of track and vertex resolutions, reconstruction of decays, estimation of ionization energy loss, as well as identification of photon conversions, nuclear interactions, and heavy-flavour …
Observation Of The First Bs--> J/Psi Phi Event In Cms, Stefan M Spanier, Giordano Cerizza
Observation Of The First Bs--> J/Psi Phi Event In Cms, Stefan M Spanier, Giordano Cerizza
Physics and Astronomy Publications and Other Works
Presentation for the International Conference on High Energy Physics, July 2010, Paris, France. The first reconstructed decay of a Bs particle in CMS that is relevant for finding information to explain the matter anti-matter asymmetry in the Universe.
Commissioning And Performance Of The Cms Pixel Tracker With Cosmic Ray Muons, The Cms Collaboration
Commissioning And Performance Of The Cms Pixel Tracker With Cosmic Ray Muons, The Cms Collaboration
Physics and Astronomy Publications and Other Works
The pixel detector of the Compact Muon Solenoid experiment consists of three barrel layers and two disks for each endcap. The detector was installed in summer 2008, commissioned with charge injections, and operated in the 3.8 T magnetic field during cosmic ray data taking. This paper reports on the first running experience and presents results on the pixel tracker performance, which are found to be in line with the design specifications of this detector. The transverse impact parameter resolution measured in a sample of high momentum muons is 18 microns.
High Energy Particle Physics At The University Of Tennessee, Stefan M Spanier
High Energy Particle Physics At The University Of Tennessee, Stefan M Spanier
Physics and Astronomy Publications and Other Works
Talk given at the Governor's school in 2009. It is an introduction to particle physics.
A Trip To The Beginning Of The Universe With The Large Hadron Collider, Stefan M Spanier
A Trip To The Beginning Of The Universe With The Large Hadron Collider, Stefan M Spanier
Physics and Astronomy Publications and Other Works
Slides from a presentation given at the Science Forum of the University of Tennessee. It discusses the physics program of the Large Hadron Collider in general terms. Serves as introductory material to the field.
Quantization Of Maximally Charged Slowly Moving Black Holes, George Siopsis
Quantization Of Maximally Charged Slowly Moving Black Holes, George Siopsis
Physics and Astronomy Publications and Other Works
We discuss the quantization of a system of slowly moving extreme Reissner-Nordström black holes. In the near-horizon limit, this system has been shown to possess an SL(2,R) conformal symmetry. However, the Hamiltonian appears to have no well-defined ground state. This problem can be circumvented by a redefinition of the Hamiltonian due to de Alfaro, Fubini, and Furlan (DFF). We apply the Faddeev-Popov quantization procedure to show that the Hamiltonian with no ground state corresponds to a gauge in which there is an obstruction at the singularities of moduli space requiring a modification of the quantization rules. The …
Scalar Absorption By Spinning D3-Branes, George Siopsis
Scalar Absorption By Spinning D3-Branes, George Siopsis
Physics and Astronomy Publications and Other Works
We discuss absorption of scalars by a distribution of spinning D3-branes. The D3-branes are multi-center solutions of supergravity theory. We solve the wave equation in various cases of supergravity backgrounds in which the equation becomes separable. We show that the absorption coefficients exhibit a universal behavior as functions of the angular momentum quantum number and the Hawking temperature. This behavior is similar to the form of the gray-body factors one encounters in scattering by black holes. Our discussion includes the problematic case of spherically symmetric distributions of D-branes, where resonances arise. We obtain the same universal form for the absorption …