Digital Commons Network^™

Introduction Of The 305Arg→305Ser Mutation In The Large Extrinsic Loop E Of The Cp43 Protein Of Synechocystis Sp. Pcc 6803 Leads To The Loss Of Cytochrome C550 Binding To Photosystem Ii, Terry M. Bricker, Andrew Young, Laurie K. Frankel, Cindy Putnam-Evans

Faculty Publications

CP43, a component of Photosystem II (PSII) in higher plants, algae and cyanobacteria, is encoded by the psbC gene. Previous work demonstrated that alteration of an arginine residue occurring at position 305 to serine produced a strain (R305S) with altered PSII characteristics including lower oxygen-evolving activity, fewer assembled reaction centers, higher sensitivity to photoinactivation, etc. [Biochemistry 38 (1999) 1582]. Additionally, it was determined that the mutant exhibited an enhanced stability of its S2 state. Recently, we observed a significant chloride effect under chloride-limiting conditions. The mutant essentially lost the ability to grow photoautotrophically, assembled fewer fully functional PSII reaction centers …

A Large-Area Ccd Camera For The Schmidt Telescope At The Venezuelan National Astronomical Observatory, C. Baltay, J. A. Snyder, P. Andrews, W. Emmet, B. Schaefer, J. Sinnott, C. Bailyn, P. Coppi, A. Oemler, C. N. Sabbey, S. Sofia, W. Van Altena, A. K. Vivas, C. Abad, A. Bongiovanni, C. Briceño, G. Bruzual, F. Della Prugna, G. Magris, Ge Sánchez, Gu Sánchez, H. Schenner, J. Stock, B. Adams, M. Gebhard, R. K. Honeycutt, J. Musser, A. Rengstorff, I. Ferrin, F. Fuenmayor, J. Hernandez, O. Naranjo, P. Rosenzweig

Faculty Publications

We have designed, constructed, and put into operation a large-area CCD camera that covers a large fraction of the image plane of the 1 m Schmidt telescope at Llano del Hato in Venezuela. The camera consists of 16 CCD devices arranged in a 4 × 4 mosaic covering 2.°3 × 3.°5 of sky. The CCDs are 2048 × 2048 LORAL devices with 15 μm pixels. The camera is optimized for drift-scan photometry and objective-prism spectroscopy. The design considerations, construction features, and performance parameters are described in the following paper.

The C-Function For Non-Compactly Causal Symmetric Spaces, Bernhard Krötz, Gestur Ólafsson

Faculty Publications

No abstract provided.

Wave Packet Spreading: Temperature And Squeezing Effects With Applications To Quantum Measurement And Decoherence, G. W. Ford, R. F. O'Connell

Faculty Publications

A localized free particle is represented by a wave packet and its motion is discussed in most quantum mechanics textbooks. Implicit in these discussions is the assumption of zero temperature. We discuss how the effects of finite temperature and squeezing can be incorporated in an elementary manner. The results show how the introduction of simple tools and ideas can bring the reader into contact with topics at the frontiers of research in quantum mechanics. We discuss the standard quantum limit, which is of interest in the measurement of small forces, and decoherence of a mixed ("Schrödinger cat") state, which has …

Phylogeny Of Acridocarpus-Brachylophon (Malpighiaceae): Implications For Tertiary Tropical Floras And Afroasian Biogeography, Charles C. Davis, Charles D. Bell, Peter W. Fritsch, Sarah Mathews

Faculty Publications

A major tenet of African Tertiary biogeography posits that lowland rainforest dominated much of Africa in the late Cretaceous and was replaced by xeric vegetation as a response to continental uplift and consequent widespread aridification beginning in the late Paleogene. The aridification of Africa is thought to have been a major factor in the extinction of many African humid-tropical lineages, and in the present-day disparity of species diversity between Africa and other tropical regions. This primarily geologically based model can be tested with independent phylogenetic evidence from widespread African plant groups containing both humid- and xeric-adapted species. We estimated the …

Tectonic And Climatic Evolution Of The Arabian Sea Region: An Introduction, Peter D. Clift, Dick Kroon, Christoph Gaedicke, Jonathan Craig

Faculty Publications

No abstract provided.

Review Of Hitler And The Power Of Aesthetics, Michael F. Russo

Faculty Publications

No abstract provided.

Annotations, Cwbr_Editor

Civil War Book Review

No abstract provided.

Between History And Fiction, Laura Ng

Civil War Book Review

Unfortunately fiction and history, both the products of our contemplation, compilation, and creativity, have not always been happy bedfellows. Historians fear that writers will abandon all facts, as William Faulkner seems to advocate: "I don't care much for facts, am not much interested in them, you....

War Is All Hell, James I. Robertson Jr.

Civil War Book Review

'War is all Hell'

Just The Facts?: Historians And Novelists Discuss The Relationship Between History And Fiction, Mark C. Carnes

Civil War Book Review

Just the Facts?

Historians and novelists discuss the relationship between history and fiction Very few phrases can make an historian flinch like "artistic license." Likewise, even a writer of the highest ....

Perspectives In History: Gary W. Gallagher Probes Perceptions Of Confederate History, Bonnie L. Bates

Civil War Book Review

Civil War Book Review (cwbr): Which do you find more informative about Lee from an historical standpoint: his military strategy or his writings? Gary W. Gallagher (gg): Both afford numerous insights into Lee's military personality. Strategically, he almost always sought to f....

The Power Of Place, Morgan N. Knull

Civil War Book Review

The Power of Place

Homeward Bound: The Demobilization Of The Union And Confederate Armies, 1865-1866, Terrence J. Winschel

Civil War Book Review

Long road home

The transformation from soldier to civilian

Embedding Dissipation And Decoherence In Unitary Evolution Schemes, A. R.P. Rau, R. A. Wendell

Faculty Publications

The dissipation and decoherence in unitary evolution schemes of quantum physics was discussed. The master equations of damped, driven two-level system were used in the density matrix. The elements of density matrix were embedded in higher-dimensional Liouville-Bloch equations. The density matrix was solved as a function of time using nonunitary integration.

A Quantum Rosetta Stone For Interferometry, Hwang Lee, Pieter Kok, Jonathan P. Dowling

Faculty Publications

Heisenberg-limited measurement protocols can be used to gain an increase in measurement precision over classical protocols. Such measurements can be implemented using, for example, optical Mach-Zehnder interferometers and Ramsey spectroscopes. We address the formal equivalence between the Mach-Zehnder interferometer, the Ramsey spectroscope and a generic quantum logic circuit. Based on this equivalence we introduce the 'quantum Rosetta stone', and we describe a projective-measurement scheme for generating the desired correlations between the interferometric input states in order to achieve Heisenberg-limited sensitivity. The Rosetta stone then tells us that the same method should work in atom spectroscopy.

Canonical Quantization Of Constrained Theories On Discrete Spacetime Lattices, Cayetano Di Bartolo, Rodolfo Gambini, Jorge Pullin

Faculty Publications

We discuss the canonical quantization of systems formulated on discrete spacetimes. We start by analysing the quantization of simple mechanical systems with discrete time. The quantization becomes challenging when the systems have anholonomic constraints. We propose a new canonical formulation and quantization for such systems in terms of discrete canonical transformations. This allows us to construct, for the first time, a canonical formulation for general constrained mechanical systems with discrete time. We extend the analysis to gauge field theories on the lattice. We consider a complete canonical formulation, starting from a discrete action, for lattice Yang-Mills theory discretized in space …

Faculty Senate Resolution 03-04, Louisiana State University And Agricultural & Mechanical College

LSU Faculty Senate Publications

Faculty Senate Resolution on grades and standards, adopted on November 7, 2002.

Strong Founder Effect In Drosophila Pseudoobscura Colonizing New Zealand From North America, J. Reiland, S. Hodge, Mohamed A.F. Noor

Faculty Publications

The North American native species Drosophila pseudoobscura was first identified in New Zealand in the last few decades. Here, we have studied the genetic consequences of its spread across the Pacific Ocean. Using 10 microsatellites that are highly variable in North American populations, we found that the New Zealand population has substantially fewer alleles, a much lower average heterozygosity, and significantly different allele frequencies at these loci. We have discussed the relative sensitivity of these parameters for detecting the founding event. X-linked loci were more strongly differentiated between continents than autosomal loci, as reflected by larger changes in allele frequencies …

Nitrogen Loading Into An Urban Estuary: Lake Pontchartrain (Louisiana, U.S.A.), R. Eugene Turner, Q. Dortch, Dubravko Justic, Erick M. Swenson

Faculty Publications

We constructed a nitrogen loading budget for the Lake Pontchartrain watershed located north of New Orleans, Louisiana (U.S.A.). Water quality measurements, discharge estimates, and literature values were used to establish the annual and seasonal variations in loading rates for total nitrogen and nitrate. The relatively stable annual loadings (million kg N) are about 10× that of the pre-settlement nitrogen loading, and come from atmosphere (1.3), the watershed (7.8), pumped urban runoff from New Orleans (1.0), and leakage through the Bonnet Carré flood control structure (0.5–0.9). Relatively minor additional amounts come from nitrogen fixation in the Lake. Occasional openings of the …

Infection Outcome And Cytokine Gene Expression In Brugia Pahangi-Infected Gerbils (Meriones Unguiculatus) Sensitized With Brucella Abortus, Sharon R. Chirgwin, Philip H. Elzer, Sharon U. Coleman, Jena M. Nowling, Sue D. Hagius, Matthew D. Edmonds, Thomas R. Klei

Faculty Publications

Filarial infections have been associated with the development of a strongly polarized Th2 host immune response and a severe impairment of mitogen-driven proliferation and type 1 cytokine production in mice and humans. The role of this polarization in the development of the broad spectra of clinical manifestations of lymphatic filariasis is still unknown. Recently, data gathered from humans as well as from immunocompromised mouse models suggest that filariasis elicits a complex host immune response involving both Th1 and Th2 components. However, responses of a similar nature have not been reported in immunologically intact permissive models of Brugia infection. Brucella abortus-killed …

Protein Folding Studies Of Adipocyte Lipid Binding Protein And Homologous Mesophilic And Thermophilic Type I Dna Polymerases, Allyn J. Schoeffler

Honors Theses

No abstract provided.

Variations In The Xenodontid Water Snake Helicops Scalaris Jan, And The Status Of H. Hogei Lancini, Douglas A. Rossman

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

No abstract provided.

Modification Of An Injection Molding Machine To Mold Micro Parts With A Liga Mold, Emil John Geiger

Honors Theses

No abstract provided.

Histone Methyltransferase Activity Of A Drosophila Polycomb Group Repressor Complex, Jürg Müller, Craig M. Hart, Nicole J. Francis, Marcus L. Vargas, Aditya Sengupta, Brigitte Wild, Ellen L. Miller, Michael B. O'Connor, Robert E. Kingston, Jeffrey A. Simon

Faculty Publications

Polycomb group (PcG) proteins maintain transcriptional repression during development, likely by creating repressive chromatin states. The Extra Sex Combs (ESC) and Enhancer of Zeste [E(Z)] proteins are partners in an essential PcG complex, but its full composition and biochemical activities are not known. A SET domain in E(Z) suggests this complex might methylate histones. We purified an ESC-E(Z) complex from Drosophila embryos and found four major subunits: ESC, E(Z), NURF-55, and the PcG repressor, SU(Z)12. A recombinant complex reconstituted from these four subunits methylates lysine-27 of histone H3. Mutations in the E(Z) SET domain disrupt methyltransferase activity in vitro and …

Faculty Senate Resolution 03-02, Louisiana State University And Agricultural & Mechanical College

LSU Faculty Senate Publications

Faculty Senate Resolution on tuition waivers for graduate assistants, adopted on October 2, 2002.

Faculty Senate Resolution 03-01, Louisiana State University And Agricultural & Mechanical College

LSU Faculty Senate Publications

Faculty Senate Resolution on increasing admissions standards, adopted on October 2, 2002.

Mammalian Retroelements, Prescott L. Deininger, Mark A. Batzer

Faculty Publications

The eukaryotic genome has undergone a series of epidemics of amplification of mobile elements that have resulted in most eukaryotic genomes containing much more of this 'junk' DNA than actual coding DNA. The majority of these elements utilize an RNA intermediate and are termed retroelements. Most of these retroelements appear to amplify in evolutionary waves that insert in the genome and then gradually diverge. In humans, almost half of the genome is recognizably derived from retroelements, with the two elements that are currently actively amplifying, L1 and Alu, making up about 25% of the genome and contributing extensively to disease. …

The Composition Of Cosmic Rays At The Knee, S. P. Swordy, L. F. Fortson, J. Hinton, J. Hörandel, J. Knapp, C. L. Pryke, T. Shibata, S. P. Wakely, Z. Cao, M. L. Cherry, S. Coutu, J. Cronin, R. Engel, J. W. Fowler, K. H. Kampert, J. Kettler, D. B. Kieda, J. Matthews, S. A. Minnick, A. Moiseev, D. Muller, M. Roth, A. Sill, G. Spiczak

Faculty Publications

The observation of a small change in spectral slope, or 'knee' in the fluxes of cosmic rays near energies 1015 eV has caused much speculation since its discovery over 40 years ago. The origin of this feature remains unknown. A small workshop to review some modern experimental measurements of this region was held at the Adler Planetarium in Chicago, USA in June 2000. This paper summarizes the results presented at this workshop and the discussion of their interpretation in the context of hadronic models of atmospheric air showers. © 2002 Elsevier Science B.V. All rights reserved.

Identification Of A Streptolysin S-Associated Gene Cluster And Its Role In The Pathogenesis Of Streptococcus Iniae Disease, Jeffrey D. Fuller, Alvin C. Camus, Carla L. Duncan, Victor Nizet, Darrin J. Bast, Ronald L. Thune, Donald E. Low, Joyce C.S. De Azavedo

Faculty Publications

Streptococcus iniae causes meningoencephalitis and death in cultured fish species and soft-tissue infection in humans. We recently reported that S. iniae is responsible for local tissue necrosis and bacteremia in a murine subcutaneous infection model. The ability to cause bacteremia in this model is associated with a genetic profile unique to strains responsible for disease in fish and humans (J. D. Fuller, D. J. Bast, V. Nizet, D. E. Low, and J. C. S. de Azavedo, Infect. Immun. 69:1994-2000, 2001). S. iniae produces a cytolysin that confers a hemolytic phenotype on blood agar media. In this study, we characterized the …