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Annotations, Cwbr_Editor

Civil War Book Review

No abstract provided.

Timescale Stretch Parameterization Of Type Ia Supernova B-Band Light Curves, G. Goldhaber, D. E. Groom, A. Kim, G. Aldering, P. Astier, A. Conley, S. E. Deustua, R. Ellis, S. Fabbro, A. S. Fruchter, A. Goobar, I. Hook, M. Irwin, M. Kim, R. A. Knop, C. Lidman, R. Mcmahon, P. E. Nugent, R. Pain, N. Panagia, C. R. Pennypacker, S. Perlmutter, P. Ruiz-Lapuente, B. Schaefer, N. A. Walton, T. York

Faculty Publications

R-band intensity measurements along the light curve of Type Ia supernovae (SNe Ia) discovered by the Supernova Cosmology Project (SCP) are fitted in brightness to templates allowing a free parameter the time-axis width factor w ≡ s(1 + z). The data points are then individually aligned in the time axis, normalized, and K-corrected back to the rest frame, after which the nearly 1300 normalized intensity measurements are found to lie on a well-determined common rest-frame B-band curve, which we call the "composite curve." The same procedure is applied to 18 low-redshift Calán/Tololo SNe with z < 0.11; these nearly 300 B-band photometry points are found to lie on the composite curve equally well. The SCP search technique produces several measurements before maximum light for each supernova. We demonstrate that the linear stretch factor, s, which parameterizes the light-curve timescale, appears independent of z, and applies equally well to the declining and rising parts of the light curve. In fact, the B-band template that best fits this composite curve fits the individual supernova photometry data when stretched by a factor s with x2/dof ≈ 1 - thus, as well as any parameterization can, given the current data sets. The measurement of the date of explosion, however, is model dependent and not tightly constrained by the current data. We also demonstrate the 1 + z light-curve time-axis broadening expected from cosmological expansion. This argues strongly against alternative explanations, such as tired light, for the redshift of distant objects.

Immortal Image: Harold Holzer Reflects On Representations Of Lincoln, Bonnie L. Bates

Civil War Book Review

Civil War Book Review (cwbr): What inspired you to re-release The Lincoln Image (University of Illinois Press, ISBN0252026691, $30.00 hardcover), 16 years after its original publication? Harold Holzer(hh): For years my co-author and good friend, Gabor Boritt, has been tr....

Echoes From The Past: An Interview With Photographer A. J. Meek, Leah Wood Jewett

Civil War Book Review

Civil War Book Review (cwbr):What first drew you to these sites? A. J. Meek (ajm): When David Madden, founding director of the Civil War Center, invited me to serve on the board, I thought I should learn something about the Civil War. My expertise was in photography and especia....

Living With History, Laura Ng

Civil War Book Review

Most often when the term "living history" is used, it is in reference to reenactments. From my short tenure as editor at Civil War Book Review, I find this definition far too limiting. Instead, I turn to T.S. Eliot who once said, "The historical sense involves a perception, not only of the pastness ....

The Moral Equivalent Of War, Morgan N. Knull

Civil War Book Review

'The moral equivalent of war'

Review Of Silent Night: The Remarkable 1914 Christmas Truce, Michael F. Russo

Faculty Publications

No abstract provided.

Measurement Of The Cosmic-Ray Energy Spectrum And Composition From 1017 To 1018.3 Ev Using A Hybrid Technique, T. Abu-Zayyad, K. Belov, D. J. Bird, J. Boyer, Z. Cao, M. Catanese, G. F. Chen, R. W. Clay, C. E. Covault, H. Y. Dai, B. R. Dawson, J. W. Elbert, B. E. Fick, L. F. Fortson, J. W. Fowler, K. G. Gibbs, M. A.K. Glasmacher, K. D. Green, Y. Ho, A. Huang, C. C. Jui, M. J. Kidd, D. B. Kieda, B. C. Knapp, S. Ko, C. G. Larsen, W. Lee, E. C. Loh, E. J. Mannel, J. Matthews, J. N. Matthews, B. J. Newport, D. F. Nitz

Faculty Publications

We study the spectrum and average mass composition of cosmic rays with primary energies between 1017 and 1018 eV using a hybrid detector consisting of the High Resolution Fly's Eye (HiRes) prototype and the Michigan Muon Array (MIA). Measurements have been made of the change in the depth of shower maximum as a function of energy. A complete Monte Carlo simulation of the detector response and comparisons with shower simulations leads to the conclusion that the cosmic-ray intensity is changing from a heavier to a lighter composition in this energy range. The spectrum is consistent with earlier Fly's Eye measurements …

L-Cysteine-Mediated Destabilization Of Dinitrosyl Iron Complexes In Proteins, Paul A. Rogers, Huangen Ding

Faculty Publications

Nitric oxide is a signaling molecule in intercellular communication as well as a powerful weapon used by macrophages to kill tumor cells and pathogenic bacteria. Here, we show that when Escherichia coli cells are exposed to nitric oxide, its ferredoxin [2Fe-2S] cluster is nitrosylated, forming the dinitrosyl iron complex with a characteristic EPR signal at gav = 2.04. Such formed ferredoxin dinitrosyl iron complex is efficiently repaired in E. coli cells even in the absence of new protein synthesis. However, the repair activity is completely inactivated once E. coli cells are disrupted, indicating that repairing the ferredoxin dinitrosyl iron complex …

An Α-Helical Domain Within The Carboxyl Terminus Of Herpes Simplex Virus Type 1 (Hsv-1) Glycoprotein B (Gb) Is Associated With Cell Fusion And Resistance To Heparin Inhibition Of Cell Fusion, Timothy P. Foster, Jeff M. Melancon, Konstantin G. Kousoulas

Faculty Publications

Previous studies from our laboratory indicated that a 28-amino-acid carboxyl-terminal truncation of gB caused extensive virus-induced cell fusion (Baghian et al., 1993, J Virol 67, 2396-2401). We tested the ability of additional truncations and mutations within gB to cause cell fusion in the recently established virus-free cell fusion assay (Turner et al., 1998, J. Virol. 72, 873-875). Deletion of the carboxyl-terminal 28 amino acids of gB (gBΔ28), which removed part of the predicted α-helical structure H17b, caused extensive cell fusion. A gB truncation specified by gBΔ36, which removed the entire H17b domain, caused as much cell fusion as the gBΔ28 …

Two-Channel Kondo Lattice Model On A Ladder Studied By The Density-Matrix Renormalization-Group Method, Juana Moreno, Shaojin Qin, P. Coleman, Lu Yu

Faculty Publications

Using the density-matrix renormalization-group (DMRG) method we study a two-channel Kondo lattice model on a half-filled ladder. Our model involves an on-site s-wave and a nearest neighbor d-wave coupling between the local moments and the conduction electrons on the ladder. By changing the relative strength of the two Kondo interactions we examine the evolution of the system from a conventional Kondo insulator with a singlet at each site to a special kind of semimetallic state formed by overlapping of Zhang-Rice-like singlets. The DMRG is used to study how the spin and charge correlation functions evolve between these two regimes.

Commentary: Considerations For Use Of Racial/Ethnic Classification In Etiologic Research, Jay S. Kaufman, Richard S. Cooper

Faculty Publications

Numerous authors have critiqued the use of race as an etiologic quantity in medical research. Despite this criticism, the use of variables encoding racial/ethnic categorization has increased in epidemiology, and most researchers agree that important variation in disease risk is captured by this classification system. Previous discussions have generally neglected to articulate guidelines for appropriate use of racial/ethnic information in etiologic research. The authors summarize the logical, conceptual, and practical problems associated with the "ethnic paradigm" as currently applied in biomedical sciences and offer a set of methodological recommendations toward more valid use of racial/ethnic classification in etiologic studies. These …

Kaufman And Copper Respond To "Race,'Racism,And The Practice Of Epidemiology, Jay S. Kaufman, Richard S. Cooper

Faculty Publications

No abstract provided.

Measurement Of The Rate Of Ve + D → P + P + E− Interactions Produced By 8B Solar Neutrinos At The Sudbury Neutrino Observatory, Q. R. Ahmad, R. C. Allen, T. C. Andersen, J. D. Anglin, G. Bühler, J. C. Barton, E. W. Beier, M. Bercovitch, J. Bigu, S. Biller, R. A. Black, I. Blevis, R. J. Boardman, J. Boger, E. Bonvin, M. G. Boulay, M. G. Bowler, T. J. Bowles, S. J. Brice, M. C. Browne, T. V. Bullard, T. H. Burritt, K. Cameron, J. Cameron, Y. D. Chan, M. Chen, H. H. Chen, X. Chen

Faculty Publications

Solar neutrinos from 8B decay have been detected at the Sudbury Neutrino Observatory via the charged current (CC) reaction on deuterium and the elastic scattering (ES) of electrons. The flux of νe’s is measured by the CC reaction rate to be φCC(ve) = 1.75 ± 0.07(stat)+0.12−0.11(syst) ± 0.05(theor) × 106 cm−2s−1. Comparison of φCC(ve) to the Super-Kamiokande Collaboration’s precision value of the flux inferred from the ES reaction yields a 3.3σ difference, assuming the systematic uncertainties are normally distributed, providing evidence of an active non-ve component in the solar flux. The total flux of active 8B neutrinos is determined to …

Function Of Escherichia Coli Biotin Carboxylase Requires Catalytic Activity Of Both Subunits Of The Homodimer, Kamala Janiyani, Tee Bordelon, Grover L. Waldrop, John E. Cronan

Faculty Publications

Biotin carboxylase catalyzes the ATP-dependent carboxylation of biotin and is one component of the multienzyme complex acetyl-CoA carboxylase that catalyzes the first committed step in fatty acid synthesis. The Escherichia coli biotin carboxylase is readily isolated from the other components of the acetyl-CoA carboxylase complex such that enzymatic activity is retained. The three-dimensional structure of biotin carboxylase, determined by x-ray crystallography, demonstrated that the enzyme is a homodimer consisting of two active sites in which each subunit contains a complete active site. To understand how each subunit contributes to the overall function of biotin carboxylase, we made hybrid molecules in …

Polymerized Oligopeptide-Surfactant Chiral Micelles, Isiah M. Warner, Eugene J. Billiot, Shahab A. Shamsi, Stefan J. Thibodeaux

College of Science Patents

Chiral separations can be enhanced through the use of polymerized dipeptide-surfactant or oligopeptide-surfactant chiral micelles. Because polymerized micelles eliminate much of the complex dynamic behavior associated with conventional micelles, polymerized chiral micelles have stronger chiral recognition properties than do otherwise-identical, "conventional" or non-polymerized chiral micelles. Recovery of chiral ligands from polymerized chiral micelles is often easier, as the chiral ligands may typically be recovered by simple extraction with an appropriate organic solvent. By contrast, recovering the solute from a conventional, non-polymerized micellar medium by extraction with an organic solvent frequently results in the formation of troublesome emulsion systems. Polymerized chiral …

Internal Parasites Of Cattle In Louisiana And Other Southern States (Research Information Sheet #104), James C. Williams, Alvin F. Loyacano

LSU AgCenter Research Information Sheets

Cattle of all ages, but particularly young cattle, are affected by a diversity of internal parasites. This publication includes information on the different types and effects of treatments.

Evidence For Temperature Dependent Moments Ordering In Ferromagnetic Nimnsb(100), C. N. Borca, Takashi Komesu, Hae Kyung Jeong, P. A. Dowben, Delia Ristoiu, Ch Hordequin, J. P. Nozières, J. Pierre, Shane Stadler, Y. U. Idzerda

Faculty Publications

From magnetic circular dichroism measurements of the Heusler alloy NiMnSb, in combination with other techniques, we show that a dramatic increase in the Mn and Ni moments occurs below a "crossover" transition temperature of about 80-100 K. This phase transition is well below the Curie temperature of NiMnSb (∼730 K). While the spin polarization near the Fermi level, from spin-polarized inverse photoemission, remains very high for k=0, it is unlikely that NiMnSb is a half-metallic ferromagnet near room temperature.

Late Cretaceous Mammals And Magnetostratigraphy, Big Bend, Texas, Julia T. Sankey, Wulf Gose

Occasional Papers of the Museum of Natural Science, Louisiana State University

No abstract provided.

Artin-Schreier Families And 2-D Cyclic Codes, Cem Guneri

LSU Historical Dissertations and Theses

We start with the study of certain Artin-Schreier families. Using coding theory techniques, we determine a necessary and sufficient condition for such families to have a nontrivial curve with the maximum possible number of rational points over the finite field in consideration. This result produces several nice corollaries, including the existence of certain maximal curves; i.e., curves meeting the Hasse-Weil bound. We then present a way to represent two-dimensional (2-D) cyclic codes as trace codes starting from a basic zero set of its dual code. This representation enables us to relate the weight of a codeword to the number of …

The Scientific Foundations Of Habitat Conservation Plans: A Quantitative Assessment, Elaine K. Harding, Elizabeth E. Crone, Bret D. Elderd, Jonathan M. Hoekstra, Alexa J. Mckerrow, John D. Perrine, Jim Regetz, Leslie J. Rissler, Amanda G. Stanley, Eric L. Walters

Faculty Publications

The number of habitat conservation plans (HCP) has risen dramatically since the first plan was written over 18 years ago. Until recently, no studies have quantitatively investigated the scientific foundations underlying these documents. As part of a larger study of HCPs, we examined 43 plans primarily to assess the availability and use of scientific data and secondarily to determine the extent of involvement by, and influence of independent scientists within the process. Specifically, our analysis focused on five key steps taken when an HCP is developed: assessing status of a species, determining take, predicting the project effects, mitigating for those …

Quasi-Su(3) Truncation Scheme For Even-Even Sd-Shell Nuclei, C. E. Vargas, J. G. Hirsch, J. P. Draayer

Faculty Publications

The quasi-SU(3) symmetry was uncovered in full pf and sdg shell-model calculations for both even-even and odd-even nuclei. It manifests itself through a dominance of single-particle and quadrupole-quadrupole terms in a Hamiltonian used to describe well-deformed nuclei. A practical consequence of the quasi-SU(3) symmetry is an efficient basis truncation scheme. In [C.E. Vargas et al., Phys. Rev. C 58 (1998) 1488] it is shown that when this type of Hamiltonian is diagonalized in an SU(3) basis, only a few irreducible representations (irreps) of SU(3) are needed to describe the yrast band, the leading S=0 irrep augmented with the leading S=1 …

Diets Of Wild Versus Released, And Pen-Raised White-Tailed Deer In Southeastern Louisiana, Richard James Meyers

LSU Historical Dissertations and Theses

Twenty pen-raised white-tailed deer (Odocoileus virginianus) were released into mixed pine-hardwood forest habitat in southeastern Louisiana to compare their seasonal diets to the diets of the wild white-tailed deer population. Microhistological analysis was used to estimate the botanical composition of fecal pellet samples collected from both populations of deer over four consecutive seasons. Wild and pen-raised deer diets were found to be an average of 75.18% similar during the entire year of the study, and were significantly associated during all seasons (P < 0.001), indicating that all deer foraged on similar plant taxa in similar proportions regardless of season. Both populations of deer were found to be predominantly browsers during all seasons, with browse and fruit accounting for a yearly average of >55% of deer diets. Results from this study indicate that rehabilitated or translocated deer released into new environments …

Observation Of An Anomalous Number Of Dimuon Events In A High Energy Neutrino Beam, T. Adams, A. Alton, S. Avvakumov, L. De Barbaro, P. De Barbaro, R. H. Bernstein, A. Bodek, T. Bolton, J. Brau, D. Buchholz, H. Budd, L. Bugel, J. Conrad, R. B. Drucker, B. T. Fleming, R. Frey, J. A. Formaggio, J. Goldman, M. Goncharov, D. A. Harris, R. A. Johnson, J. H. Kim, S. Koutsoliotas, M. J. Lamm, W. Marsh, D. Mason, J. Mcdonald, C. Mcnulty, K. S. Mcfarland, D. Naples, P. Nienaber, A. Romosan, W. K. Sakumoto

Faculty Publications

A search for long-lived neutral particles (N0’s) with masses above 2.2GeV/c2 that decay into at least one muon has been performed using an instrumented decay channel at the NuTeV experiment at Fermilab. Data were examined for particles decaying into the final states μμ, μe, and μ π . Three μ μ events were observed over an expected standard model background of 0.069 ± 0.010 events; no events were observed in the other modes. © 2001 American Physical Society.

Decoherence Without Dissipation, G. W. Ford, R. F. O'Connell

Faculty Publications

The prototypical Schrödinger cat state, i.e., an initial state corresponding to two widely separated Gaussian wave packets, is considered. The decoherence time is calculated solely within the framework of elementary quantum mechanics and equilibrium statistical mechanics. This is at variance with common lore that irreversible coupling to a dissipative environment is the mechanism of decoherence. Here, we show that, on the contrary, decoherence can in fact occur at high temperature even for vanishingly small dissipation. © 2001 Elsevier Science B.V. All rights reserved.

First Principles Thermoelasticity Of Mgsio3-Perovskite: Consequences For The Inferred Properties Of The Lower Mantle, Bijaya B. Karki, Renata M. Wentzcovitch, Stefano De Gironcoli, Stefano Baroni

Faculty Publications

Some key thermoelastic properties of MgSiO - perovskite (pv) have been determined at lower mantle (LM) pressures and temperatures using the quasi-harmonic approximation in conjunction with first principles phonon dispersions. The adiabatic bulk moduli (K ) of pv and of an assemblage of 80 vol% pv and 20 vol% MgO were obtained along the thermodynamically inferred adiabat and compared with the seismic counterpart given by the preliminary reference Earth model (K ). The discrepancy between calculated K 's and K in the deep LM suggests a super-adiabatic gradient, or subtle changes of composition, or phase, or all beginning at about …

Site-Directed Mutagenesis Of Atp Binding Residues Of Biotin Carboxylase: Insight Into The Mechanism Of Catalysis, Valerie Sloane, Carol Z. Blanchard, Frankie Guillot, Grover L. Waldrop

Faculty Publications

Acetyl-CoA carboxylase catalyzes the first committed step in fatty acid synthesis in all plants, animals, and bacteria. The Escherichia coli form is a multimeric protein complex consisting of three distinct and separate components: biotin carboxylase, carboxyltransferase, and the biotin carboxyl carrier protein. The biotin carboxylase component catalyzes the ATP-dependent carboxylation of biotin using bicarbonate as the carboxylate source and has a distinct architecture that is characteristic of the ATP-grasp superfamily of enzymes. Included in this superfamily are D-Ala D-Ala ligase, glutathione synthetase, carbamyl phosphate synthetase, N⁵-carboxyaminoimidazole ribonucleotide synthetase, and glycinamide ribonucleotide transformylase, all of which have known three-dimensional …

Non-Conformally Flat Bulk Spacetime And The 3-Brane World, Parampreet Singh, Naresh Dadhich

Faculty Publications

We show that for non-conformally flat bulk spacetime, there exist no bound modes for zero mass graviton on the 3-brane. The brane world model is therefore unstable for the bulk spacetime being different from the conformally flat anti-de Sitter space. © 2001 Elsevier Science B.V.

Fibers. A Model For Studying Cell Differentiation, Cell Elongation, And Cell Wall Biosynthesis, R. Zhong, D. H. Burk, Z. H. Ye

Faculty Publications

No abstract provided.

Preparations For Transformation Of Drosophila Melanogaster With Green Fluorescent Protein-Tagged Dmnopp140 And Dmnopp140-Rgg By P-Element Transformation, Jennifer Mccain

Honors Capstones

No abstract provided.