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Articles 1 - 30 of 868
Full-Text Articles in Entire DC Network
Multicolour Observations Of V404 Cyg With Ultracam, T. Shahbaz, V. S. Dhillon, T. R. Marsh, C. Zurita, C. A. Haswell, P. A. Charles, R. I. Hynes, J. Casares
Multicolour Observations Of V404 Cyg With Ultracam, T. Shahbaz, V. S. Dhillon, T. R. Marsh, C. Zurita, C. A. Haswell, P. A. Charles, R. I. Hynes, J. Casares
Faculty Publications
We present high-time-resolution multicolour observations of the quiescent soft X-ray transient V404 Cyg obtained with ULTRACAM. Superimposed on the ellipsoidal modulation of the secondary star are large flares on time-scales of a few hours, as well as several distinct rapid flares on time-scales of tens of minutes. The rapid flares, most of which show further variability and unresolved peaks, cover shorter time-scales than those reported in previous observations. The power density spectrum of the 5-s time-resolution data shows a quasi-periodic oscillation (QPO) feature at 0.78 mHz (= 21.5 min). Assuming this periodicity represents the Keplerian period at the transition between …
Overexpression Of Gk In Gk-Transformed Cells Collapses The Golgi Apparatus Into The Endoplasmic Reticulum Inhibiting Virion Egress, Glycoprotein Transport, And Virus-Induced Cell Fusion, Timothy P. Foster, Galena V. Rybachuk, Xavier Alvarez, Olga Borkhsenious, Konstantin G. Kousoulas
Overexpression Of Gk In Gk-Transformed Cells Collapses The Golgi Apparatus Into The Endoplasmic Reticulum Inhibiting Virion Egress, Glycoprotein Transport, And Virus-Induced Cell Fusion, Timothy P. Foster, Galena V. Rybachuk, Xavier Alvarez, Olga Borkhsenious, Konstantin G. Kousoulas
Faculty Publications
Intracellular transport and egress of alphaherpesviruses require the coordinate function of multiple proteins and glycoproteins. Recently, we showed that gK is expressed on infected cell surfaces and that gK cell-surface expression required the presence of the UL20 protein [J. Virol. 77 (2003), 499]. Overexpression of gK by gK-transformed cells blocked transport of enveloped virions from perinuclear spaces and inhibited virus-induced cell fusion caused by gK syncytial mutants [J. Virol. 69 (1995), 5401]. Therefore, we investigated whether altered synthesis and transport of gK was responsible for the observed gK-mediated interference phenomena. HSV-1 infection of the gK-transformed cell line Vero (gK9) caused …
A Close Look At U (5) ↔ Su (3) Transitional Patterns In The Interacting Boson Model, Feng Pan, J. P. Draayer, Yanan Luo
A Close Look At U (5) ↔ Su (3) Transitional Patterns In The Interacting Boson Model, Feng Pan, J. P. Draayer, Yanan Luo
Faculty Publications
We study transitional patterns from the vibrational, U (5), to the rotational, SU (3), limit of the interacting boson model with a schematic Hamiltonian. The transitional behavior of low-lying energy levels, isomer shifts, E2 transition rates, and some other related quantities across the entire U (5) ↔ SU (3) transitional region are studied in detail. The analysis shows that nuclei in the critical region are soft. © 2003 Published by Elsevier B.V.
Multiwavelength Observations Revealing The Evolution Of The Outburst Of The Black Hole Xte J1118+480, S. Chaty, C. A. Haswell, J. Malzac, R. I. Hynes, C. R. Shrader, W. Cui
Multiwavelength Observations Revealing The Evolution Of The Outburst Of The Black Hole Xte J1118+480, S. Chaty, C. A. Haswell, J. Malzac, R. I. Hynes, C. R. Shrader, W. Cui
Faculty Publications
We report multiwavelength observations of the soft X-ray transient XTE J1118+480, which we observed with UKIRT, Hubble Space Telescope (HST), RXTE, Extreme Ultraviolet Explorer (EUVE) and many other instruments and facilities. Adding radio (Ryle Telescope, VLA), submillimetre (JCMT) and X-ray (Chandra and SAX) data from the literature, we assembled the most complete spectral energy distribution (SED) of this source yet published. We followed the evolution of this source for 1 yr, including six observations performed during the outburst, and one observation at the end of the outburst. Because of the unusually high galactic latitude of XTE J118+480, it suffers from …
Information Systems And Decision Sciences, Gitanjali Ayesha Appadu
Information Systems And Decision Sciences, Gitanjali Ayesha Appadu
Honors Theses
No abstract provided.
Differential Recursion Relations For Laguerre Functions On Hermitian Matrices, Mark Davidson, Gestur Ólafsson
Differential Recursion Relations For Laguerre Functions On Hermitian Matrices, Mark Davidson, Gestur Ólafsson
Faculty Publications
In our previous papers we studied Laguerre functions and polynomials on symmetric cones Ω= H/L. The Laguerre functions ℓnv, n ∈, form an orthogonal basis in L2(Ω, dμv)L and are related via the Laplace transform to an orthogonal set in the representation space of a highest weight representations (πv, Hv) of the automorphism group G corresponding to a tube domain T(Ω). In this article, we consider the case where Ω is the space of positive definite Hermitian matrices and G = SU(n, n). We describe the Lie algebraic realization of πv acting in L 2(Ω, dμv) and use that to …
Decoherence At Zero Temperature, G. W. Ford, R. F. O'Connell
Decoherence At Zero Temperature, G. W. Ford, R. F. O'Connell
Faculty Publications
Most discussions of decoherence in the literature consider the high temperature regime but it is also known that, in the presence of dissipation, decoherence can occur even at zero temperature. Whereas most previous investigations all assumed initial decoupling of the quantum system and bath, we consider that the system and environment are entangled at all times. Here, we discuss decoherence for a free particle in an initial Schrödinger cat state. Memory effects are incorporated by use of the single relaxation time model.
Ponderomotive Shearing For Spectral Interferometry Of Extreme-Ultraviolet Pulses, Johan Mauritsson, Rodrigo López-Martens, Anne L'Huillier, Kenneth J. Schafer
Ponderomotive Shearing For Spectral Interferometry Of Extreme-Ultraviolet Pulses, Johan Mauritsson, Rodrigo López-Martens, Anne L'Huillier, Kenneth J. Schafer
Faculty Publications
We propose a novel method for completely characterizing ultrashort pulses at extreme-ultraviolet (XUV) wavelengths by adapting the technique of spectral phase interferometry for direct electric-field reconstruction to this spectral region. Two-electron wave packets are coherently produced by photoionizing atoms with two time-delayed replicas of the XUV pulse. For one of the XUV pulses, photoionization occurs in the presence of a strong infrared pulse that ponderomotively shifts the binding energy, thereby providing the spectral shear needed for reconstruction of the spectral phase of the XUV pulse. © 2003 Optical Society of America.
Rubisco Activase Is Required For Optimal Photosynthesis In The Green Alga Chlamydomonas Reinhardtii In A Low-Co2 Atmosphere, Steve V. Pollock, Sergio L. Colombo, Davey L. Prout, Ashley C. Godfrey, James V. Moroney
Rubisco Activase Is Required For Optimal Photosynthesis In The Green Alga Chlamydomonas Reinhardtii In A Low-Co2 Atmosphere, Steve V. Pollock, Sergio L. Colombo, Davey L. Prout, Ashley C. Godfrey, James V. Moroney
Faculty Publications
This report describes a Chlamydomonas reinhardtii mutant that lacks Rubisco activase (Rca). Using the BleR (bleomycin resistance) gene as a positive selectable marker for nuclear transformation, an insertional mutagenesis screen was performed to select for cells that required a high-CO2 atmosphere for optimal growth. The DNA flanking the Ble R insert of one of the high-CO2-requiring strains was cloned using thermal asymmetric interlaced-polymerase chain reaction and inverse polymerase chain reaction and sequenced. The flanking sequence matched the C. reinhardtii Rca cDNA sequence previously deposited in the National Center for Biotechnology Information database. The loss of a functional Rca in the …
Agouti Expression In Human Adipose Tissue: Functional Consequences And Increased Expression In Type 2 Diabetes, Steven R. Smith, Barbara Gawronska-Kozak, Lenka Janderová, Taylor Nguyen, Angela Murrel, Jacqueline M. Stephens, Randall L. Mynatt
Agouti Expression In Human Adipose Tissue: Functional Consequences And Increased Expression In Type 2 Diabetes, Steven R. Smith, Barbara Gawronska-Kozak, Lenka Janderová, Taylor Nguyen, Angela Murrel, Jacqueline M. Stephens, Randall L. Mynatt
Faculty Publications
It is well recognized that the agouti/melanocortin system is an important regulator of body weight homeostasis. Given that agouti is expressed in human adipose tissue and that the ectopic expression of agouti in adipose tissue results in moderately obese mice, the link between agouti expression in human adipose tissue and obesity/type 2 diabetes was investigated. Although there was no apparent relationship between agouti mRNA levels and BMI, agouti mRNA levels were significantly elevated in subjects with type 2 diabetes. The regulation of agouti in cultured human adipocytes revealed that insulin did not regulate agouti mRNA, whereas dexamethasone treatment potently increased …
Molecular And Culture-Based Analyses Of Aerobic Carbon Monoxide Oxidizer Diversity, Gary M. King
Molecular And Culture-Based Analyses Of Aerobic Carbon Monoxide Oxidizer Diversity, Gary M. King
Faculty Publications
Isolates belonging to six genera not previously known to oxidize CO were obtained from enrichments with aquatic and terrestrial plants. DNA from these and other isolates was used in PCR assays of the gene for the large subunit of carbon monoxide dehydrogenase (coxL). CoxL and putative coxL fragments were amplified from known CO oxidizers (e.g., Oligotropha carboxidovorans and Bradyrhizobium japonicum), from novel CO-oxidizing isolates (e.g., Aminobacter sp. strain COX, Burkholderia sp. strain LUP, Mesorhizobium sp. strain NMB1, Stappia strains M4 and M8, Stenotrophomonas sp. strain LUP, and Xanthobacter sp. strain COX), and from several well-known isolates for which the capacity …
Uptake Of Carbon Monoxide And Hydrogen At Environmentally Relevant Concentrations By Mycobacteria, Gary M. King
Uptake Of Carbon Monoxide And Hydrogen At Environmentally Relevant Concentrations By Mycobacteria, Gary M. King
Faculty Publications
Liquid culture assays revealed a previously unreported capacity for Mycobacterium bovis BCG, M. gordonae, and M. marinum to oxidize CO and for M. smegmatis to consume molecular hydrogen. M. bovis BCG, M. gordonae, M. smegmatis, and M. tuberculosis H37Ra oxidized CO at environmentally relevant concentrations (<50 >ppm); H2 oxidation by M. gordonae and M. smegmatis also occurred at environmentally relevant concentrations (< 10 ppm). CO was not consumed by M. avium or M. microti, although the latter appeared to possess CO dehydrogenase (CODH) genes based on PCR results with primers designed for the CODH large subunit, coxL. M. smegmatis and M. gordonae oxidized CO under suboxic (10 and 1% atmospheric oxygen) and anoxic conditions in the presence of nitrate; no oxidation occurred under anoxic conditions without nitrate. Similar results were obtained for H2 oxidation by M. smegmatis. Phylogenetic analyses of coxL PCR products indicated that mycobacterial sequences form a subclade distinct from that of other bacterial coxL, with limited differentiation among fast- and slow-growing strains.
Design-Dependent Loads In Topology Optimization, Blaise Bourdin, Antonin Chambolle
Design-Dependent Loads In Topology Optimization, Blaise Bourdin, Antonin Chambolle
Faculty Publications
We present, analyze, and implement a new method for the design of the stiffest structure subject to a pressure load or a given field of internal forces. Our structure is represented as a subset S of a reference domain, and the complement of S is made of two other "phases", the "vold" and a fictitious "liquid" that exerts a pressure force on its interface with the solid structure. The problem we consider is to minimize the compliance of the structure S, which is the total work of the pressure and internal forces at the equilibrium displacement. In order to prevent …
Regularization Of Integral Equations In Spaces Of Distributions, Ricardo Estrada
Regularization Of Integral Equations In Spaces Of Distributions, Ricardo Estrada
Faculty Publications
In this article the notion of multiplicative regularizator, a smooth function that by multiplication allows the extension of operators in spaces of distributions, is introduced, and several of the properties are obtained. Applications to Hilbert transforms, Carleman operators, fractional integration operators and generalized Abel operators are given. © 2003 Rocky Mountain Mathematics Consortium.
Military Education: Republican Virtues And Civic Responsibility, Benjamin Price
Military Education: Republican Virtues And Civic Responsibility, Benjamin Price
Civil War Book Review
In this monograph, Rod Andrew Jr. studies the development of southern military academies and land grant universities with military-training components. Outgrowths of the antebellum and postbellum periods, V.M.I., The Citadel, Texas A&M, Clemson and other such schools sought to instill discipline in ....
Cwbr Author Interview: Compelling Images Enhance Narrative Histories: Interview With William C. Davis, Colleen H. Fava, Leah Wood Jewett
Cwbr Author Interview: Compelling Images Enhance Narrative Histories: Interview With William C. Davis, Colleen H. Fava, Leah Wood Jewett
Civil War Book Review
William C. Davis is the author or editor of more than 40 books on the Civil War and Southern history, as well as numerous documentary screenplays. He has served as historical consultant on various television and film productions. Davis has twice been nominated for the Pulitzer Prize in history and is currently professor of history at the Virginia Polytechnic Institute and State University. His most recent book, The Civil War in Photographs (Carlton 2002), served as the platform for this interview...
A New Beginning, Colleen H. Fava
A New Beginning, Colleen H. Fava
Civil War Book Review
On behalf of the previous editors, the U.S. Civil War Center, and myself I would like to thank Michael Zibart and the BookPage team for their commitment to this publication over the last few years. It is with regret, for both parties, that our publishing partnership has been dissolved. As most of ....
A Comparative Survey Of The U.S. And Italy, Morgan N. Knull
A Comparative Survey Of The U.S. And Italy, Morgan N. Knull
Civil War Book Review
The strong winds of political unification during the 1990s were met with a countervailing gust of nationalism. Germany reunited and the European Union solidified, even as the Soviet Union, Yugoslavia, and Czechoslovakia disintegrated sectional movements in such places as Quebec, Scotland, and Italy ....
A Meditation: Essays Question The Meaning Of War, Randal Allred
A Meditation: Essays Question The Meaning Of War, Randal Allred
Civil War Book Review
Few of the writers have done so well at asking the truly hard questions about the Civil War as has Kent Gramm, whose compelling Somebody's Darling: Essays on the Civil War approaches the masterful achievement of Robert Penn Warren's The Legacy Civil War as a meditation on what the War ....
Literature In Context, David Madden
Literature In Context, David Madden
Civil War Book Review
This novel, sesquicentennial edition of Harriet Beecher Stowe's world classic novel Uncle Tom's Cabin is Charles Johnson's book. His brief but forceful and provocative introduction will overwhelm whatever the reader experiences in the Johnson has written four novels, one of which, Middle P....
Annotations, Cwbr_Editor
Local-Field Factors In A Polarized Two-Dimensional Electron Gas, Juana Moreno, C. Marinescu
Local-Field Factors In A Polarized Two-Dimensional Electron Gas, Juana Moreno, C. Marinescu
Faculty Publications
We derive approximate expressions for the static local-field factors of a spin-polarized two-dimensional electron gas that smoothly interpolate between their small- and large-wave-vector asymptotic limits. The proposed analytical expressions reproduce recent diffusion Monte Carlo data for the unpolarized and fully polarized electron gas. We find that the degree of spin polarization produces important modifications to the local factors of the minority spins, while the local-field functions of the majority spins are less affected. © 2003 The American Physical Society.
All Linear Optical Quantum Memory Based On Quantum Error Correction, Robert M. Gingrich, Pieter Kok, Hwang Lee, Farrokh Vatan, Jonathan P. Dowling
All Linear Optical Quantum Memory Based On Quantum Error Correction, Robert M. Gingrich, Pieter Kok, Hwang Lee, Farrokh Vatan, Jonathan P. Dowling
Faculty Publications
An error-correction scheme that encodes an unknown two-photon state into four photons, up to one of which can be lost in the transmission is presented. Such a device acts as a simple repeater or quantum transponder when it is placed in series, and it acts as an optical quantum memory when it is inserted in an optical loop. Using this scheme, the conversion between flying qubits and stationary qubits in memory is not necessary, as the memory and quantum logic gates are composed fo the same optical resources.
Novel Finite-Differencing Techniques For Numerical Relativity: Application To Black-Hole Excision, Gioel Calabrese, Luis Lehner, David Neilsen, Jorge Pullin, Oscar Reula, Olivier Sarbach, Manuel Tiglio
Novel Finite-Differencing Techniques For Numerical Relativity: Application To Black-Hole Excision, Gioel Calabrese, Luis Lehner, David Neilsen, Jorge Pullin, Oscar Reula, Olivier Sarbach, Manuel Tiglio
Faculty Publications
We use rigorous techniques from numerical analysis of hyperbolic equations in bounded domains to construct stable finite-difference schemes for numerical relativity, in particular for their use in black-hole excision. As an application, we present 3D simulations of a scalar field propagating in a Schwarzschild black-hole background.
A New General Purpose Event Horizon Finder For 3d Numerical Spacetimes, Peter Diener
A New General Purpose Event Horizon Finder For 3d Numerical Spacetimes, Peter Diener
Faculty Publications
I present a new general purpose event horizon finder for full 3D numerical spacetimes. It works by evolving a complete null surface backwards in time. The null surface is described as the zero-level set of a scalar function, which in principle is defined everywhere. This description of the surface allows the surface, trivially, to change topology, making this event horizon finder able to handle numerical spacetimes where two (or more) black holes merge into a single final black hole.
New Constraints On Ωm, Ωλ And W From An Independent Set Of 11 High-Redshift Supernovae Observed With The Hubble Space Telescope, R. A. Knop, G. Aldering, R. Amanullah, P. Astier, G. Blanc, M. S. Burns, A. Conley, S. E. Deustua, M. Doi, R. Ellis, S. Fabbro, G. Folatelli, A. S. Fruchter, G. Garavini, S. Garmond, K. Garton, R. Gibbons, G. Goldhaber, A. Goobar, D. E. Groom, D. Hardin, I. Hook, D. A. Howell, A. G. Kim, B. C. Lee, C. Lidman, J. Mendez, S. Nobili, P. E. Nugent, R. Pain, N. Panagia, C. R. Pennypacker, S. Perlmutter
New Constraints On Ωm, Ωλ And W From An Independent Set Of 11 High-Redshift Supernovae Observed With The Hubble Space Telescope, R. A. Knop, G. Aldering, R. Amanullah, P. Astier, G. Blanc, M. S. Burns, A. Conley, S. E. Deustua, M. Doi, R. Ellis, S. Fabbro, G. Folatelli, A. S. Fruchter, G. Garavini, S. Garmond, K. Garton, R. Gibbons, G. Goldhaber, A. Goobar, D. E. Groom, D. Hardin, I. Hook, D. A. Howell, A. G. Kim, B. C. Lee, C. Lidman, J. Mendez, S. Nobili, P. E. Nugent, R. Pain, N. Panagia, C. R. Pennypacker, S. Perlmutter
Faculty Publications
We report measurements of ΩM, ΩΛ nd w from 11 supernovae (SNe) at z = 0.36-0.86 with high-quality light curves measured using WFPC2 on the Hubble Space Telescope (HST). This is an independent set of high-redshift SNe that confirms previous SN evidence for an accelerating universe. The high-quality light curves available from photometry on WFPC2 make it possible for these 11 SNe alone to provide measurements of the cosmological parameters comparable in statistical weight to the previous results. Combined with earlier Supernova Cosmology Project data, the new SNe yield a measurement of the mass density ΩM = 0.25 -0.06+0.07 (statistical) …
Small Magellanic Cloud-Type Interstellar Dust In The Milky Way, Lynne A. Valencic, Geoffrey C. Clayton, Karl D. Gordon, Tracy L. Smith
Small Magellanic Cloud-Type Interstellar Dust In The Milky Way, Lynne A. Valencic, Geoffrey C. Clayton, Karl D. Gordon, Tracy L. Smith
Faculty Publications
It is well known that the sight line toward HD 204827 in the cluster Trumpler 37 shows a UV extinction curve that does not follow the average Galactic extinction relation. However, when a dust component, fore-ground to the cluster, is removed, the residual extinction curve is identical to that found in the SMC within the uncertainties. The curve is very steep and has little or no 2175 A bump. The position of HD 204827 in the sky is projected onto the edge of the Cepheus IRAS bubble. In addition, HD 204827 has an IRAS bow shock, indicating that it may …
Faculty Senate Resolution 04-01, Louisiana State University And Agricultural & Mechanical College
Faculty Senate Resolution 04-01, Louisiana State University And Agricultural & Mechanical College
LSU Faculty Senate Publications
Faculty Senate Resolution on adding an undergraduate student to the Faculty Senate general election committee, adopted on November 7, 2003.
Faculty Senate Resolution 04-03, Louisiana State University And Agricultural & Mechanical College
Faculty Senate Resolution 04-03, Louisiana State University And Agricultural & Mechanical College
LSU Faculty Senate Publications
Faculty Senate Resolution regarding a constitutional amendment on faculty governance, adopted on November 7, 2003.
High Throughput Virus-Induced Gene Silencing Implicates Heat Shock Protein 90 In Plant Disease Resistance, Rui Lu, Isabelle Malcuit, Peter Moffett, Maria T. Ruiz, Jack Peart, Ai Jiuan Wu, John P. Rathjen, Abdelhafid Bendahmane, Louise Day, David C. Baulcombe
High Throughput Virus-Induced Gene Silencing Implicates Heat Shock Protein 90 In Plant Disease Resistance, Rui Lu, Isabelle Malcuit, Peter Moffett, Maria T. Ruiz, Jack Peart, Ai Jiuan Wu, John P. Rathjen, Abdelhafid Bendahmane, Louise Day, David C. Baulcombe
Faculty Publications
Virus-induced gene silencing was used to assess the function of random Nicotiana benthamiana cDNAs in disease resistance. Out of 4992 cDNAs tested from a normalized library, there were 79 that suppressed a hypersensitive response (HR) associated with Pto-mediated resistance against Pseudomonas syringae. However, only six of these clones blocked the Pto-mediated suppression of P. syringae growth. The three clones giving the strongest loss of Pto resistance had inserts corresponding to HSP90 and also caused loss of Rx-mediated resistance against potato virus X and N-mediated tobacco mosaic virus resistance. The role of HSP90 as a cofactor of disease resistance is associated …