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The Phytochrome Gene Family In Grasses (Poaceae): A Phylogeny And Evidence That Grasses Have A Subset Of The Loci Found In Dicot Angiosperms, S. Mathews, Robert A. Sharrock Jan 1996

The Phytochrome Gene Family In Grasses (Poaceae): A Phylogeny And Evidence That Grasses Have A Subset Of The Loci Found In Dicot Angiosperms, S. Mathews, Robert A. Sharrock

Faculty Publications

The phytochrome nuclear gene family encodes photoreceptor proteins that mediate developmental responses to red and far red light throughout the life of the plant. From studies of the dicot flowering plant Arabidopsis, the family has been modeled as comprising five loci, PHYA-PHYE. However, it has been shown recently that the Arabidopsis model may not completely represent some flowering plant groups because additional PHY loci related to PHYA and PHYB of Arabidopsis apparently have evolved independently several times in dicots, and monocot flowering plants may lack orthologs of PHYD and PHYE of Arabidopsis. Nonetheless, the phytochrome nucleotide data were informative in …

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In Situ Analyses Of Methane Oxidation Associated With The Roots And Rhizomes Of A Bur Reed, Sparganium Eurycarpum, In A Maine Wetland, G. M. King Jan 1996

In Situ Analyses Of Methane Oxidation Associated With The Roots And Rhizomes Of A Bur Reed, Sparganium Eurycarpum, In A Maine Wetland, G. M. King

Faculty Publications

Methane oxidation associated with the belowground tissues of a common aquatic macrophyte, the burweed Sparganium eurycarpum, was assayed in situ by a chamber technique with acetylene or methyl fluoride as a methanotrophic inhibitor at a headspace concentration of 3 to 4%. Acetylene and methyl fluoride inhibited both methane oxidation find peat methanogenesis. However, inhibition of methanogenesis resulted in no obvious short-term effect on methane fluxes. Since neither inhibitor adversely affected plant metabolism and both inhibited methanotrophy equally well, acetylene was employed for routine assays because of its low cost and ease of use. Root-associated methanotrophy consumed a variable but significant …

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Characterization Of The Denaturation And Renaturation Of Human Plasma Vitronectin I. Biophysical Characterization Of Protein Unfolding And Multimerization, Ping Zhuang, Michael N. Blackburn, Cynthia B. Peterson Jan 1996

Characterization Of The Denaturation And Renaturation Of Human Plasma Vitronectin I. Biophysical Characterization Of Protein Unfolding And Multimerization, Ping Zhuang, Michael N. Blackburn, Cynthia B. Peterson

Faculty Publications

Upon treatment with denaturing agents, vitronectin has been observed to exhibit conformational alterations which are similar to the structural changes detected when vitronectin binds the thrombin-antithrombin complex or associates with the terminal attack complex of complement. Denaturation and renaturation of vitronectin isolated from human plasma were characterized by changes in intrinsic fluorescence. Unfolding by chemical denaturants was irreversible and accompanied by self-association of the protein to form vitronectin multimers. Self-association was evaluated by equilibrium analytical ultracentrifugation which demonstrated that multimers form only during the refolding process after removal of denaturant, that multimeric vitronectin dissociates to constituent subunits readily upon treatment …

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The Nazca Lines, Andrew Sluyter Jan 1996

The Nazca Lines, Andrew Sluyter

Faculty Publications

No abstract provided.

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Veracruz (State), Andrew Sluyter Jan 1996

Veracruz (State), Andrew Sluyter

Faculty Publications

No abstract provided.

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The Ecological Origins And Consequences Of Cattle Ranching In Sixteenth-Century New Spain, Andrew Sluyter Jan 1996

The Ecological Origins And Consequences Of Cattle Ranching In Sixteenth-Century New Spain, Andrew Sluyter

Faculty Publications

Despite the dramatic landscape changes Mexico has undergone due to the introduction of cattle ranching by the Spaniards in the early sixteenth century, the ecological origins of that pastroecosystem have remained obscure. About 1521, Gregorio de Villalobos implanted an Andalusian-derived herding ecology in the Gulf Coast lowlands that involved seasonal movement of cattle between wetlands and hill lands. Land-grant records demonstrate that as the colonial economy expanded, the transhumant model proliferated and came into conflict with those native settlements that had survived the pandemics of the early sixteenth century. In circumventing viceregal laws meant to protect native cultures and ecologies, …

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Efficient Long-Pcr Site-Specific Mutagenesis Of A High Gc Template, Vladimir Chouljenko, Sukhanya Jayachandra, Galina Rybachuk, Konstantin G. Kousoulas Jan 1996

Efficient Long-Pcr Site-Specific Mutagenesis Of A High Gc Template, Vladimir Chouljenko, Sukhanya Jayachandra, Galina Rybachuk, Konstantin G. Kousoulas

Faculty Publications

A long-PCR method was developed for the efficient site-specific mutagenesis of herpes simplex virus (HSV-1) DNA fragments with high GC content. In this protocol, a PCR product was partially extended first using a cloned DNA fragment. The final mutagenized fragment was produced after a second extension using another PCR product and final amplification using external primers. The sequential use of two extension reduction increased the predicted frequency of the engineered mutation in the final product to 100%. This method was used to generate a mutated glycoprotein K (gK) gene specified by HSV-1. A recombinant virus that carried the mutated gK …

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Optimal Culture Conditions For The Propagation Of The Oyster Pathogen Perkinsus Marinus (Apicomplexa) In Protein Deficient Medium, J. F. La Peyre, M. Faisal Jan 1996

Optimal Culture Conditions For The Propagation Of The Oyster Pathogen Perkinsus Marinus (Apicomplexa) In Protein Deficient Medium, J. F. La Peyre, M. Faisal

Faculty Publications

The protozoan, Perkinsus marinus, acclimated and proliferated in the culture medium JL-ODRP-1 without bovine serum albumin. The principal culture conditions for the optima propagation of P. marinus in this protein deficient culture medium, were determined. The greatest growth rates of the parasite occurred at 28 °C, 661 mOsm/kg and pH 7.5. Decreasing seeding densities from 16 × 105 to 1 × 105 also increased growth rate. After several passages in the absence of 5 % CO2 tension, the growth rote of P. marinus was similar to its original value in the presence of 5 % CO2 tension. This protein deficient …

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The Htra Stress Response Protease Contributes To Resistance Of Brucella Abortus To Killing By Murine Phagocytes, Philip H. Elzer, Robert W. Phillips, Gregory T. Robertson, R. Martin Roop Jan 1996

The Htra Stress Response Protease Contributes To Resistance Of Brucella Abortus To Killing By Murine Phagocytes, Philip H. Elzer, Robert W. Phillips, Gregory T. Robertson, R. Martin Roop

Faculty Publications

Compared with virulent Brucella abortus 2308, the isogenic htrA mutant PHE1 shows decreased resistance to killing by cultured murine neutrophils and macrophages and significant attenuation during the early stages of infection in the BALB/c mouse model. These findings further define the contributions of the htrA gene product to the pathogenesis of B. abortus infections.

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Gastrointestinal Motility And Disease In Large Animals, Christine B. Navarre, Allen J. Roussel Jan 1996

Gastrointestinal Motility And Disease In Large Animals, Christine B. Navarre, Allen J. Roussel

Faculty Publications

An understanding of the relationship between gastrointestinal (GI) motility and disease is imperative for the proper treatment of large animal patients, especially as new therapeutic agents become available. However, the abundance of information that has become available in the last 2 decades makes gaining this understanding a formidable task. This article summarizes the changes in GI motility caused by some common diseases and conditions encountered in large animal practice, such as GI obstruction, postoperative ileus, resection and anastomosis, diarrhea, endotoxemia, GI parasitism, hypocalcemia, and pregnancy. Copyright © 1996 by the American College of Veterinary Internal Medicine.

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Gastrointestinal Motility And Disease In Large Animals, Christine B. Navarre, Allen J. Roussel Jan 1996

Gastrointestinal Motility And Disease In Large Animals, Christine B. Navarre, Allen J. Roussel

Faculty Publications

An understanding of the relationship between gastrointestinal (GI) motility and disease is imperative for the proper treatment of large animal patients, especially as new therapeutic agents become available. However, the abundance of information that has become available in the last 2 decades makes gaining this understanding a formidable task. This article summarizes the changes in GI motility caused by some common diseases and conditions encountered in large animal practice, such as GI obstruction, postoperative ileus, resection and anastomosis, diarrhea, endotoxemia, GI parasitism, hypocalcemia, and pregnancy. Copyright © 1996 by the American College of Veterinary Internal Medicine.

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The Mobile Genetic Element Alu In The Human Genome, Gabriel E. Novick, Mark A. Batzer, Prescott L. Deininger, Rene J. Herrera Jan 1996

The Mobile Genetic Element Alu In The Human Genome, Gabriel E. Novick, Mark A. Batzer, Prescott L. Deininger, Rene J. Herrera

Faculty Publications

No abstract provided.

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Alu Fossil Relics - Distribution And Insertion Polymorphism, Santosh S. Arcot, Aaron W. Adamson, Jane E. Lamerdin, Brian Kanagy, Prescott L. Deininger, Anthony V. Carrano, Mark A. Batzer Jan 1996

Alu Fossil Relics - Distribution And Insertion Polymorphism, Santosh S. Arcot, Aaron W. Adamson, Jane E. Lamerdin, Brian Kanagy, Prescott L. Deininger, Anthony V. Carrano, Mark A. Batzer

Faculty Publications

Screening of a human genomic library with an oligonucleotide probe specific for one of the young subfamilies of Alu repeats (Ya5/8) resulted in the identification of several hundred positive clones. Thirty-three of these clones were analyzed in detail by DNA sequencing. Oligonucleotide primers complementary to the unique sequence regions flanking each Alu repeat were used in PCR-based assays to perform phylogenetic analyses, chromosomal localization, and insertion polymorphism analyses within different human population groups. All 33 Alu repeats were present only in humans and absent from orthologous positions in several nonhuman primate genomes. Seven Alu repeats were polymorphic for their presence/absence …

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Development Of A Defined Minimal Medium For The Growth Of Edwardsiella Ictaluri, L. A. Collins, R. L. Thune Jan 1996

Development Of A Defined Minimal Medium For The Growth Of Edwardsiella Ictaluri, L. A. Collins, R. L. Thune

Faculty Publications

In this report, a complete defined medium and a minimally defined medium are described for Edwardsiella ictaluri. The complete defined medium consists of 46 individual components, including a basal salt solution, glucose, magnesium sulfate, iron sulfate, six trace metals, four nucleotides, 10 vitamins, and 19 amino acids. This medium supports growth in broth and on solid media. Optimal growth at 30°C was obtained at pH 7.0, and at an osmolality of 390 mosmol/kg of H2O, with a glucose concentration of 4 g/liter. The defined minimal medium reduces the 46 components of the complete medium to eight essential components, including the …

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Historical Diversification Of Birds In Northwestern South America: A Molecular Perspective On The Role Of Vicariant Events, Robb T. Brumfield, A. P. Capparella Jan 1996

Historical Diversification Of Birds In Northwestern South America: A Molecular Perspective On The Role Of Vicariant Events, Robb T. Brumfield, A. P. Capparella

Faculty Publications

Studies of South American biodiversity have identified several areas of endemism that may have enhanced historical diversification of South American organisms. Hypotheses concerning the derivation of birds in the Choco area of endemism in northwestern South America were evaluated using protein electrophoretic data from 14 taxonomically diverse species groups of birds. Nine of these groups demonstrated that the Choco area of endemism has a closer historical relationship to Central America than to Amazonia, a result that is consistent with phytogeographic evidence. Within species groups, genetic distances between cis-Andean (east of the Andes) and trans-Andean (west of the Andes) taxa are, …

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Quality Of Mercy Must Be Restrained, And Other Lessons In Learning To Love The Federal Sentencing Guidelines, Frank O. Bowman Iii Jan 1996

Quality Of Mercy Must Be Restrained, And Other Lessons In Learning To Love The Federal Sentencing Guidelines, Frank O. Bowman Iii

Faculty Publications

In the remarks that follow, I do four things. First, for those unfamiliar with the Federal Sentencing Guidelines, I begin by explaining briefly how the Guidelines work. Second, I endeavor to show why Judge Cabranes is wrong, absolutely wrong in declaring the Guidelines a failure, and mostly wrong in the specific criticisms he and others level against the Guidelines. Third, after jousting with Judge Cabranes a bit, I discuss some problems with the current federal sentencing system, most notably the sheer length of narcotics sentences. Finally, I comment briefly on some of the implications of the Guidelines, and the principles …

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Once A Century: Time For A Structural Overhaul Of The Federal Courts, Martha Dragich Jan 1996

Once A Century: Time For A Structural Overhaul Of The Federal Courts, Martha Dragich

Faculty Publications

In this Article, I describe a structure capable of accommodating growing caseloads in a manner consistent with basic values of appellate justice. Before doing so, I sketch in Part I the structural evolution of the federal courts. Part II describes the current pressures on the courts of appeals, while Part III examines the effects of internal reforms on the quality of appellate justice and the development of a coherent body of national law. Next, in Part IV, I posit requirements for the federal courts' third century. Part V reviews major proposals to address the caseload crisis in the courts of …

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Trademark Parody: Lessons From The Copyright Decision In Campbell V. Acuff-Rose Music, Gary Myers Jan 1996

Trademark Parody: Lessons From The Copyright Decision In Campbell V. Acuff-Rose Music, Gary Myers

Faculty Publications

Parodies have long provided many of us with amusement, entertainment,and sometimes even information. An effective parody can convey one or more messages with powerful effect. The message may be a political statement, social commentary, commercial speech, a bawdy joke, ridicule of a brand name, criticism of commercialism, or just plain humor for its own sake. Often someone's ox is being gored, or someone feels that a property right has been infringed. The party so injured often contemplates a lawsuit, and an array of legal theories are available to further that impulse. Perhaps copyright infringement is the claim, if some protectable …

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Defamation, Reputation, And The Myth Of Community, Lyrissa Lidsky Jan 1996

Defamation, Reputation, And The Myth Of Community, Lyrissa Lidsky

Faculty Publications

The complex interaction between defamation, reputation, and community values defines the tort of defamation. A defamatory communication tends to harm a plaintiff's reputation in the eyes of the plaintiff's community. Thus, to determine whether a given statement is defamatory, courts must first identify the plaintiff's community and its norms - an inquiry that presents both theoretical and doctrinal difficulties in a heterogeneous and pluralistic society. Current approaches to identifying the plaintiff's community are particularly inadequate in two common types of cases: (1) cases in which the plaintiff belongs to a subcommunity espousing different values than those prevailing generally, and (2) …

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Survey Results: Use Of Durable Powers, David M. English Jan 1996

Survey Results: Use Of Durable Powers, David M. English

Faculty Publications

The use of durable powers of attorney (DPA) has developed rapidly over the last decade. This growth reflects the public's desire for a simple and effective method of planning for possible incapacity. Although there are other planning tools, individuals frequently prefer the DPA. It is more comprehensive and provides greater certainty of result than does a joint bank account. A DPA is much easier to create than a revocable trust. By using a DPA, one can avoid an intrusive and possibly cumbersome guardianship or conservatorship proceeding.

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High-Multiplicity Lead-Lead Interactions At 158 Gev/C Per Nucleon, P. Deines-Jones, M. L. Cherry, A. Dabrowska, R. Holynski, W. V. Jones, E. D. Kolganova, D. Kudzia, B. S. Nilsen, A. Olszewski, E. A. Pozharova, K. Sengupta, M. Szarska, A. Trzupek, C. J. Waddington, J. P. Wefel, B. Wilczynska, H. Wilczynski, W. Wolter, B. Wosiek, K. Wozniak Jan 1996

High-Multiplicity Lead-Lead Interactions At 158 Gev/C Per Nucleon, P. Deines-Jones, M. L. Cherry, A. Dabrowska, R. Holynski, W. V. Jones, E. D. Kolganova, D. Kudzia, B. S. Nilsen, A. Olszewski, E. A. Pozharova, K. Sengupta, M. Szarska, A. Trzupek, C. J. Waddington, J. P. Wefel, B. Wilczynska, H. Wilczynski, W. Wolter, B. Wosiek, K. Wozniak

Faculty Publications

The Krakow-Louisiana-Minnesota-Moscow Collaboration (KLMM) has exposed a set of emulsion chambers with lead targets to a 158 GeV/c per nucleon beam of 208Pb nuclei, and we report the initial analysis of 40 high-multiplicity Pb-Pb collisions. To test the validity of the superposition model of nucleus-nucleus interactions in this new regime, we compare the shapes of the pseudorapidity distributions with FRITIOF Monte Carlo model calculations, and find close agreement for even the most central events. We characterize head-on collisions as having a mean multiplicity of 1550± 120 and a peak pseudorapidity density of 390± 30. These estimates are significantly lower than …

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Ultrasound Attenuation In Gap-Anisotropic Systems, J. Moreno, P. Coleman Jan 1996

Ultrasound Attenuation In Gap-Anisotropic Systems, J. Moreno, P. Coleman

Faculty Publications

Transverse ultrasound attenuation provides a weakly coupled probe of momentum current correlations in electronic systems. We develop a simple theory for the interpretation of transverse ultrasound attenuation coefficients in systems with nodal gap anisotropy. Applying this theory we show how ultrasound can delineate between extended-(Formula presented) and (Formula presented)-wave scenarios for the cuprate superconductors. © 1996 The American Physical Society.

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The Peak Brightness Of Sn 1960f In Ngc 4496 And The Hubble Constant, Bradley E. Schaefer Jan 1996

The Peak Brightness Of Sn 1960f In Ngc 4496 And The Hubble Constant, Bradley E. Schaefer

Faculty Publications

The light curve of the Type Ia supernova SN1960F (in NGC 4496) is important because the Bubble Space Telescope has measured the distance to the host galaxy by means of Cepheid variables, and thus the Hubble constant can be derived. Important parameters in this derivation include the peak magnitude as well as the decline rate of the supernova. In this Letter, I report on the results of my quantitative light-curve template fitting to all published data. These reported data are widely discrepant yet can be made all consistent after the brightnesses of the comparison stars are brought onto the Johnson …

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Measurement Of Elastic Ω Photoproduction At Hera, M. Derrick, D. Krakauer, S. Magill, D. Mikunas, B. Musgrave, J. R. Okrasiński, J. Repond, R. Stanek, R. L. Talaga, H. Zhang, M. C.K. Mattingly, F. Anselmo, P. Antonioli, G. Bari, M. Basile, L. Bellagamba, D. Boscherini, A. Bruni, G. Bruni, P. Bruni, G. Cara Romeo, G. Castellini, L. Cifarelli, F. Cindolo, A. Contin, M. Corradi, I. Gialas, P. Giusti, G. Iacobucci, G. Laurenti, G. Levi, A. Margotti, T. Massam Jan 1996

Measurement Of Elastic Ω Photoproduction At Hera, M. Derrick, D. Krakauer, S. Magill, D. Mikunas, B. Musgrave, J. R. Okrasiński, J. Repond, R. Stanek, R. L. Talaga, H. Zhang, M. C.K. Mattingly, F. Anselmo, P. Antonioli, G. Bari, M. Basile, L. Bellagamba, D. Boscherini, A. Bruni, G. Bruni, P. Bruni, G. Cara Romeo, G. Castellini, L. Cifarelli, F. Cindolo, A. Contin, M. Corradi, I. Gialas, P. Giusti, G. Iacobucci, G. Laurenti, G. Levi, A. Margotti, T. Massam

Faculty Publications

No abstract provided.

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Evidence For Ν¯Μ → Ν¯E Oscillations From The Lsnd Experiment At The Los Alamos Meson Physics Facility, C. Athanassopoulos, L. B. Auerbach, R. L. Burman, I. Cohen, D. O. Caldwell, B. D. Dieterle, J. B. Donahue, A. M. Eisner, A. Fazely, F. J. Federspiel, G. T. Garvey, M. Gray, R. M. Gunasingha, R. Imlay, K. Johnston, H. J. Kim, W. C. Louis, R. Majkic, J. Margulies, K. Mcilhany, W. Metcalf, G. B. Mills, R. A. Reeder, V. Sandberg, D. Smith, I. Stancu, W. Strossman, R. Tayloe, G. J. Vandalen, W. Vernon, N. Wadia, J. Waltz, Y. X. Wang Jan 1996

Evidence For Ν¯Μ → Ν¯E Oscillations From The Lsnd Experiment At The Los Alamos Meson Physics Facility, C. Athanassopoulos, L. B. Auerbach, R. L. Burman, I. Cohen, D. O. Caldwell, B. D. Dieterle, J. B. Donahue, A. M. Eisner, A. Fazely, F. J. Federspiel, G. T. Garvey, M. Gray, R. M. Gunasingha, R. Imlay, K. Johnston, H. J. Kim, W. C. Louis, R. Majkic, J. Margulies, K. Mcilhany, W. Metcalf, G. B. Mills, R. A. Reeder, V. Sandberg, D. Smith, I. Stancu, W. Strossman, R. Tayloe, G. J. Vandalen, W. Vernon, N. Wadia, J. Waltz, Y. X. Wang

Faculty Publications

A search for ν¯μ → ν¯e oscillations has been conducted at the Los Alamos Meson Physics Facility by using ν¯μ from μ+ decay at rest. The ν¯e are detected via the reaction ν¯e p → e+ n, correlated with a γ from np → dγ (2.2 MeV). The use of tight cuts to identify e+ events with correlated γ rays yields 22 events with e+ energy between 36 and 60 MeV and only 4.6 ± 0.6 background events. A fit to the e+ events between 20 and 60 MeV yields a total excess of 51.8+18.7−16.9 ± 8.0 events. If attributed …

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Evidence For Neutrino Oscillations From Muon Decay At Rest, C. Athanassopoulos, L. B. Auerbach, R. L. Burman, I. Cohen, D. O. Caldwell, B. D. Dieterle, J. B. Donahue, A. M. Eisner, A. Fazely, F. J. Federspiel, G. T. Garvey, M. Gray, R. M. Gunasingha, R. Imlay, K. Johnston, H. J. Kim, W. C. Louis, R. Majkic, J. Margulies, K. Mcilhany, W. Metcalf, G. B. Mills, R. A. Reeder, V. Sandberg, D. Smith, I. Stancu, W. Strossman, R. Tayloe, G. J. Vandalen, W. Vernon, N. Wadia, J. Waltz, Y. X. Wang Jan 1996

Evidence For Neutrino Oscillations From Muon Decay At Rest, C. Athanassopoulos, L. B. Auerbach, R. L. Burman, I. Cohen, D. O. Caldwell, B. D. Dieterle, J. B. Donahue, A. M. Eisner, A. Fazely, F. J. Federspiel, G. T. Garvey, M. Gray, R. M. Gunasingha, R. Imlay, K. Johnston, H. J. Kim, W. C. Louis, R. Majkic, J. Margulies, K. Mcilhany, W. Metcalf, G. B. Mills, R. A. Reeder, V. Sandberg, D. Smith, I. Stancu, W. Strossman, R. Tayloe, G. J. Vandalen, W. Vernon, N. Wadia, J. Waltz, Y. X. Wang

Faculty Publications

A search for ν̄μ→ν̄e oscillations has been conducted at the Los Alamos Meson Physics Facility using ν̄μ from μ+ decay at rest. The ν̄e are detected via the reaction ν̄ep→e+n, correlated with the 2.2 MeV γ from np→dγ. The use of tight cuts to identify e+ events with correlated γ rays yields 22 events with e+ energy between 36 and 60 MeV and only 4.6±0.6 background events. The probability that this excess is due entirely to a statistical fluctuation is 4.1×10-8. A χ2 fit to the entire e+ sample results in a total excess of 51.0+20.2-19.5±8.0 events with e+ energy …

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Inclusive Charged Particle Distributions In Deep Inelastic Scattering Events At Hera, M. Derrick, D. Krakauer, S. Magill, D. Mikunas, B. Musgrave, J. Repond, R. Stanek, R. L. Talaga, H. Zhang, G. Bari, M. Basile, L. Bellagamba, D. Boscherini, A. Bruni, G. Bruni, P. Bruni, G. Cara Romeo, G. Castellini, L. Cifarelli, F. Cindolo, A. Contin, M. Corradi, I. Gialas, P. Giusti, G. Iacobucci, G. Laurenti, G. Levi, A. Margotti, T. Massam, R. Nania, F. Palmonari, A. Polini, G. Sartorelli Jan 1996

Inclusive Charged Particle Distributions In Deep Inelastic Scattering Events At Hera, M. Derrick, D. Krakauer, S. Magill, D. Mikunas, B. Musgrave, J. Repond, R. Stanek, R. L. Talaga, H. Zhang, G. Bari, M. Basile, L. Bellagamba, D. Boscherini, A. Bruni, G. Bruni, P. Bruni, G. Cara Romeo, G. Castellini, L. Cifarelli, F. Cindolo, A. Contin, M. Corradi, I. Gialas, P. Giusti, G. Iacobucci, G. Laurenti, G. Levi, A. Margotti, T. Massam, R. Nania, F. Palmonari, A. Polini, G. Sartorelli

Faculty Publications

A measurement of inclusive charged particle distributions in deep inelastic ep scattering for γ*p centre-of-mass energies 75 < W < 175 GeV and momentum transfer squared 10 < Q2 < 160 GeV2 from the ZEUS detector at HERA is presented. The differential charged particle rates in the γ*p centre-of-mass system as a function of the scaled longitudinal momentum, xF, and of the transverse momentum, pt* and , as a function of xF, W and Q2 are given. Separate distributions are shown for events with (LRG) and without (NRG) a rapidity gap with respect to the proton direction. The data are compared with results from experiments at lower beam energies, with the naive quark parton model and with parton models including perturbative QCD corrections. The comparison shows the importance of the higher order QCD processes. Significant differences of the inclusive charged particle rates between NRG and LRG events at the same W are observed. The value of for LRG events with a hadronic mass MX, which excludes the forward produced baryonic system, is similar to the

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Measurement Of The Diffractive Cross Section In Deep Inelastic Scattering, M. Derrick, D. Krakauer, S. Magill, D. Mikunas, B. Musgrave, J. R. Okrasinski, J. Repond, R. Stanek, R. L. Talaga, H. Zhang, M. C.K. Mattingly, G. Bari, M. Basile, L. Bellagamba, D. Boscherini, A. Bruni, G. Bruni, P. Bruni, G. Cara Romeo, G. Castellini, L. Cifarelli, F. Cindolo, A. Contin, M. Corradi, I. Gialas, P. Giusti, G. Iacobucci, G. Laurenti, G. Levi, A. Margotti, T. Massam, R. Nania, F. Palmonari Jan 1996

Measurement Of The Diffractive Cross Section In Deep Inelastic Scattering, M. Derrick, D. Krakauer, S. Magill, D. Mikunas, B. Musgrave, J. R. Okrasinski, J. Repond, R. Stanek, R. L. Talaga, H. Zhang, M. C.K. Mattingly, G. Bari, M. Basile, L. Bellagamba, D. Boscherini, A. Bruni, G. Bruni, P. Bruni, G. Cara Romeo, G. Castellini, L. Cifarelli, F. Cindolo, A. Contin, M. Corradi, I. Gialas, P. Giusti, G. Iacobucci, G. Laurenti, G. Levi, A. Margotti, T. Massam, R. Nania, F. Palmonari

Faculty Publications

Diffractive scattering of γ∗p → X + N, where N is either a proton or a nucleonic system with MN < 4 GeV has been measured in deep inelastic scattering (DIS) at HERA. The cross section was determined by a novel method as a function of the γ∗p c.m. energy W between 60 and 245 GeV and of the mass MX of the system X up to 15 GeV at average Q2 values of 14 and 31 GeV2. The diffractive cross section dσdi f f /dMX is, within errors, found to rise linearly with W. Parameterizing the W dependence by the form dσdi f f /dMX ∞ (W2)(2αIP - 2) the DIS data yield for the pomeron trajectory αIP = 1.23±0.02(stat)±0.04(syst) averaged over t in the measured kinematic range assuming the longitudinal photon contribution to be zero. This value for the pomeron trajectory is substantially larger than αIP extracted from soft interactions. The value of αIP measured in this analysis suggests that a substantial part of the diffractive DIS cross section originates from processes which can be described by perturbative QCD. From the measured diffractive cross sections the diffractive structure function of the proton F2D(3) (β,Q2, xIP) has been determined, where β is the momentum fraction of the struck quark in the pomeron. The form F2D(3) = constant·(1/xIP)a gives a good fit to the data in all β and Q2 intervals with a = 1.46 ± 0.04(stat) ± 0.08(syst).

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Measurement Of The F2 Structure Function In Deep Inelastic E+P Scattering Using 1994 Data From The Zeus Detector At Hera, M. Derrick, D. Krakauer, S. Magill, D. Mikunas, B. Musgrave, J. R. Okrasinski, J. Repond, R. Stanek, R. L. Talaga, H. Zhang, M. C.K. Mattingly, F. Anselmo, P. Antonioli, G. Bari, M. Basile, L. Bellagamba, D. Boscherini, A. Bruni, G. Bruni, P. Bruni, G. Cara Romeo, G. Castellini, L. Cifarelli, F. Cindolo, A. Contin, M. Corradi, I. Gialas, P. Giusti, G. Iacobucci, G. Laurenti, G. Levi, A. Margotti, T. Massam Jan 1996

Measurement Of The F2 Structure Function In Deep Inelastic E+P Scattering Using 1994 Data From The Zeus Detector At Hera, M. Derrick, D. Krakauer, S. Magill, D. Mikunas, B. Musgrave, J. R. Okrasinski, J. Repond, R. Stanek, R. L. Talaga, H. Zhang, M. C.K. Mattingly, F. Anselmo, P. Antonioli, G. Bari, M. Basile, L. Bellagamba, D. Boscherini, A. Bruni, G. Bruni, P. Bruni, G. Cara Romeo, G. Castellini, L. Cifarelli, F. Cindolo, A. Contin, M. Corradi, I. Gialas, P. Giusti, G. Iacobucci, G. Laurenti, G. Levi, A. Margotti, T. Massam

Faculty Publications

We present measurements of the structure function F2 in e+p scattering at HERA in the range 3.5 GeV2 < Q2 < 5000 GeV2. A new reconstruction method has allowed a significant improvement in the resolution of the kinematic variables and an extension of the kinematic region covered by the experiment. At Q2 < 35 GeV2 the range in x now spans 6.3 · 10-5 < x < 0.08 providing overlap with measurements from fixed target experiments. At values of Q2 above 1000 GeV2 the x range extends to 0.5. Systematic errors below 5% have been achieved for most of the kinematic region. The structure function rises as x decreases; the rise becomes more pronounced as Q2 increases. The behaviour of the structure function data is well described by next-to-leading order perturbative QCD as implemented in the DGLAP evolution equations. © Springer-Verlag 1996.

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The Allegro Gravitational Wave Detector: Data Acquisition And Analysis, E. Mauceli, Z. K. Geng, W. O. Hamilton, W. W. Johnson, S. Merkowitz, A. Morse, B. Price, N. Solomonson Jan 1996

The Allegro Gravitational Wave Detector: Data Acquisition And Analysis, E. Mauceli, Z. K. Geng, W. O. Hamilton, W. W. Johnson, S. Merkowitz, A. Morse, B. Price, N. Solomonson

Faculty Publications

We discuss the data acquisition and analysis procedures used on the Allegro gravity wave detector, including a full description of the filtering used for bursts of gravity waves. The uncertainties introduced into timing and signal strength estimates due to stationary noise are measured, giving the windows for both quantities in coincidence searches. © 1996 The American Physical Society.

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