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Articles 1 - 30 of 33
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Association Of K-1 Capsule, Smooth Lipopolysaccharides, Trat Gene, And Colicin V Production With Complement Resistance And Virulence Of Avian Escherichia Coli, Richard E. Wooley, Lisa K. Nolan, John Brown, Penelope S. Gibbs, Catherine W. Giddings, Kathy S. Turner
Association Of K-1 Capsule, Smooth Lipopolysaccharides, Trat Gene, And Colicin V Production With Complement Resistance And Virulence Of Avian Escherichia Coli, Richard E. Wooley, Lisa K. Nolan, John Brown, Penelope S. Gibbs, Catherine W. Giddings, Kathy S. Turner
Lisa K. Nolan
A group of complement-resistant, virulent avian Eschberichia coli isolates were compared with a group of complement-sensitive, avirulent avian isolates for the presence of K-1 capsule, smooth lipopolysaccharides (LPS), the traT gene, and Colicin V (ColV) production. These parameters were selected because of their reported association with complement resistance and virulence in E. coli. Lethality in chicken embryos has also been shown to be correlated with virulence of avian E. colifor chickens. The complement-resistant, virulent E. coli isolates did not possess a K-1 capsule. Production of ColV and the presence of smooth LPS were significantly correlated with embryo lethality. There was …
Brittle Composites Modeling: Compazisons With Mosi2/Zro2, S.P. Chen, Richard Alan Lesar, A. D. Rollett
Brittle Composites Modeling: Compazisons With Mosi2/Zro2, S.P. Chen, Richard Alan Lesar, A. D. Rollett
Richard Alan Lesar
We have calculated the mechanical properties of brittle composites with spring-network (SN) model. The composites that we studied involve the transformation toughening effects and the accompanying micro-cracking. Our simulation results are consistent with experiments of MoSi2 toughened with ZrO2. By monitoring the stress changes due to the transformation and micro-cracking we are able to separate, for the first time, the contributions from these two competing effects. We also found that the fracture toughness of the composite increases as the modulus, interfacial cohesion of particle increases.
Parallel Image Segmentation Using A Hopfield Neural Network With Annealing Schedule For Neural Gains, Yungsik Kim, Sarah A. Rajala
Parallel Image Segmentation Using A Hopfield Neural Network With Annealing Schedule For Neural Gains, Yungsik Kim, Sarah A. Rajala
Sarah A. Rajala
Neural network architectures have been proposed as new computer architectures and a Hopfield neural network has been shown to find good solutions very fast in solving complex optimization problems. It should be noted, however, that a Hopfield neural network with fixed neural gains only guarantees to find local optimum solutions, not the global optimum solution. Image segmentation, like other engineering problems, can be formalized as an optimization problem and implemented using neural network architectures if an appropriate optimization function is defined. To achieve a good image segmentation, the global or the nearly global optimum solutions of the appropriate optimization function …
Inclusion Of Charge Correlations In Calculations Of The Energetics And Electronic Structure For Random Substitutional Alloys, Duane D. Johnson, F. J. Pinski
Inclusion Of Charge Correlations In Calculations Of The Energetics And Electronic Structure For Random Substitutional Alloys, Duane D. Johnson, F. J. Pinski
Duane D. Johnson
Currently, the coherent-potential approximation (CPA) implemented via the multiple-scattering theory of Korringa, Kohn, and Rostoker (KKR) gives the best first-principles description of the electronic structure for random substitutional alloys. However, the total energy has an important component of electrostatic energy missing, namely, that arising from the correlation of charges with varying atomic environments. We develop a ‘‘charge-correlated’’ CPA method (cc-CPA) which includes (some) local environmental charge correlations within the KKR-CPA method. We investigate the cc-CPA energetics for several alloys and show that the formation energies are in better agreement with experimental results. These calculations show that the excess charge on …
Resistivity Of The High-Temperature Metallic Phase Of Vo2, Werner W. Schulz, Philip B. Allen, Renate M. Wentzcovitch, Paul C. Canfield
Resistivity Of The High-Temperature Metallic Phase Of Vo2, Werner W. Schulz, Philip B. Allen, Renate M. Wentzcovitch, Paul C. Canfield
Paul C. Canfield
Measurements are reported on the electrical resistivity ρ(T) along the c axis of a single crystal of VO2, from the metal-insulator transition at T=333 K up to 840 K. The temperature dependence is very linear, and a fit to Bloch-Grüneisen theory gives a residual resistivity ρ0=65 μΩ cm and a ratio ρ(840 K)/ρ0=8. With the help of a local-density-approximation band-structure calculation, we further pursue the conventional (Bloch-Boltzmann) interpretation by extracting the electron-phonon coupling constant λ=1.1 and the mean free path l(800 K)=3.3 Å. The short mean free path implies that the conventional interpretation is internally inconsistent. The most likely explanation …
Does Methane Invert Through Square Planar?, Mark S. Gordon, Michael Schmidt
Does Methane Invert Through Square Planar?, Mark S. Gordon, Michael Schmidt
Mark S. Gordon
MCSCF calculations using a triple-t basis set augmented with diffuse and polarization functions are used to probe that part of the singlet methane potential energy surface that pertains to the inversion of CH4 from one t~trahedral structure t.o another. The true inversion transition state is found to have a distorted C, structure, quite different both ge?me.tncally ~nd energetically from the previously presumed square planar saddle point. At the secondorder configuration mte.ractl~n.level of theory, the barrier to inversion is predicted to be just 7-8 kcaljmol higher in energy than the bond diSSOCiation energy for the first C-H bond cleavage in methane.
Three-Point Correlation Functions In Uniformly And Randomly Driven Diffusive Systems, K. Hwang, Beate Schmittmann, R. K. P. Zia
Three-Point Correlation Functions In Uniformly And Randomly Driven Diffusive Systems, K. Hwang, Beate Schmittmann, R. K. P. Zia
Beate Schmittmann
Driven far away from equilibrium by both uniform and random external fields, a system of diffusing particles with short-range attractive forces displays many singular thermodynamic properties. Surprisingly, measuring pair correlations in lattice-gas models with saturation drives, we find little difference between the uniform and random cases, even though the underlying symmetries are quite distinct. Motivated by this puzzle, we study three-point correlations using both field-theoretic and simulation techniques. The continuum theory predicts the following: (a) The three-point function is nonzero only for the uniformly driven system; (b) it is odd under a parity transformation; and (c) there exists an infinite …
Optimum Displacement Estimates Using Mean Field Annealing, Ikhlas M. Abdelqader, Sarah A. Rajala, Griff L. Bilbro, Wesley E. Snyder
Optimum Displacement Estimates Using Mean Field Annealing, Ikhlas M. Abdelqader, Sarah A. Rajala, Griff L. Bilbro, Wesley E. Snyder
Sarah A. Rajala
In this paper a new algorithm to estimate dense displacement fields from a sequence of images is developed. The algorithm is based on modeling the displacement fields as Markov Random fields. The Markov Random fields-Gibbs equivalence is then used to convert the problem into one of finding an appropriate energy function that describes the motion and any constraints imposed on it. Mean field annealing, a technique which finds global minima in nonconvex optimization problems, is used to minimize the energy function, and solve for the optimum displacement fields. The algorithm results in accurate estimates even for scenes with noise or …
Experimental And Computational Studies Of Four-Coordinate Aluminum: The Reaction Of Aluminates And Acids, Robert Damrauer, Michèle Krempp, Niels H. Damrauer, Michael W. Schmidt, Mark S. Gordon
Experimental And Computational Studies Of Four-Coordinate Aluminum: The Reaction Of Aluminates And Acids, Robert Damrauer, Michèle Krempp, Niels H. Damrauer, Michael W. Schmidt, Mark S. Gordon
Mark S. Gordon
The gas-phase reactions of trimethylaluminates with a variety of acids are considered from both an experimental and computational perspective. The experimental work involves product and kinetic studies of ten aluminates, [(CH3hAlX]- (X= H, CH3, NH2, OH, F, SiH3, PH2, SH, Cl, and OCH3). Both X and methyl cleavage pathways are observed in these reactions. X cleavage occurs with several aluminates (X = H, NH2, OH, and PH2), in contrast to the thermochemical predictions of ab initio computations performed at the MP2/6-31 ++G(d,p) level. These indicate that methyl cleavage is favored in the reaction of nine aluminates (OCH3 was not computed) …
Bacterial Starvation Stress And Contamination Of Beef, James S. Dickson, J. F. Frank
Bacterial Starvation Stress And Contamination Of Beef, James S. Dickson, J. F. Frank
James S. Dickson
Salmonella typhimurium, Listeria monocytogenes, ad Escherichia coli 0157;H7 were starved by suspending washed cells in phosphate buffer for 5 days at 10, 25 or 37 degrees C. Starved bacteria were evaluated for their ability to attach to beef tissue and their sensitivity to acetic acid sanitizing. Starvation stress generally decreased the numbers of bacteria which attached to the tissue when compared to control bacterial cultures grown to late logarithmic growth phase. Starvation temperature was negatively correlated to the numbers of attached bacteria. Starvation slightly increased the sensitivity of attached S. typhimurium and L. monocytogenes cells to acetic acid, but did …
Identification Of Β2 Integrins In Bovine Neutrophils By Scanning Electron Microscopy In The Backscatter Mode And Transmission Electron Microscopy, Mark R. Ackermann, M. E. Kehrli Jr., H. K. Hawkins, J. L. Amenson, J. E. Gallagher
Identification Of Β2 Integrins In Bovine Neutrophils By Scanning Electron Microscopy In The Backscatter Mode And Transmission Electron Microscopy, Mark R. Ackermann, M. E. Kehrli Jr., H. K. Hawkins, J. L. Amenson, J. E. Gallagher
Mark R. Ackermann
Mac-I, LFA-I, and p150,95 are β2 integrin glycoproteins present in the plasma membranes of neutrophils, macrophages, and lymphocytes.
Forage Yield, Quality, Compatibility, And Persistence Of Warm-Season Grass—Legume Mixtures, G. L. Posler, Andrew W. Lenssen, G. L. Fine
Forage Yield, Quality, Compatibility, And Persistence Of Warm-Season Grass—Legume Mixtures, G. L. Posler, Andrew W. Lenssen, G. L. Fine
Andrew W. Lenssen
Development of compatible, persistent, warm-season grass-legume mixtures could increase forage yield and quality during summer months. We established a trial to determine forage yield, quality, species compatibility, and persistence of binary mixtures of warm-season grasses with selected legumes, five of which are native to the central USA. Grass entries were switchgrass (Panicum virgatum L.), sideoats grama (Bouteloua curtipendula Michx.), and indiangrass [Sorghastrum nutans (L.) Nash]. Legume entries were purple prairieclover [Dalea purpurea Vent.; syn. Petalostemon purpureum (Vent.) Rydb.], roundhead lespedeza (Lespedeza capitata Michx.), leadplant (Amorpha canescens Pursh), Illinois bundleflower [Desmanthus illinoensis (Michx.) MacMill., B. Robins. & Fern.], catclaw sensitive brier …
Evaluation Of A Ceramic Roof Coating, William H. Allen, Jay D. Harmon, Dale E. Linvill, Matthew V. Bramblett
Evaluation Of A Ceramic Roof Coating, William H. Allen, Jay D. Harmon, Dale E. Linvill, Matthew V. Bramblett
Jay D. Harmon
Surfaces treated with a ceramic roof coating (CRC) marketed as AZTEC No. 100 were compared to untreated and white painted surfaces. Dry-bulb and black globe temperatures in the space below or behind the surface were the criteria for comparison. Comparisons included small horizontal panels with open sides, small unvented galvanized steel and styrofoam boxes, and an open-side steel poultry building. The CRC was effective in reducing temperatures in the enclosed test boxes, but less effective with open-side test panels and the open-side steel building. Tests also indicated the CRC is characterized by high emissivity (0.95) and reflectivity (0.87). The evidence …
The Kavousi Coarse Wares: A Bronze Age Chronology For Survey In The Mirabello Area, East Crete, Donald C. Haggis, Margaret S. Mook
The Kavousi Coarse Wares: A Bronze Age Chronology For Survey In The Mirabello Area, East Crete, Donald C. Haggis, Margaret S. Mook
Margaret S. Mook
This paper presents the results of the Kavousi-Thriphti Survey coarse-ware study. It is argued that coarse utilitarian pottery can be used for dating sites in archaeological survey, and further, that coarse pottery on the surface of any site with a domestic or storage function may represent a wider, and thus more accurate, chronological range than the associated fine wares. Detailed descriptions of 18 coarse fabric types identified in the survey region are presented. Thirteen of these fabrics were determined to be chronologically diagnostic. These fabric types, with their proposed chronological ranges and proveniences, provide sufficient data to begin analyzing the …
New Excavations Of A Middle Minoan Cemetery In East Crete, Donald C. Haggis, Margaret S. Mook, Jennifer L. Tobin, B.J. Hayden
New Excavations Of A Middle Minoan Cemetery In East Crete, Donald C. Haggis, Margaret S. Mook, Jennifer L. Tobin, B.J. Hayden
Margaret S. Mook
The Kalo Khorio Archaeological Rescue Project (KARP) is the excavation of a Middle Minoan (I-II) cemetery in the region of Kalo Khorio-Istron, at the southern edge of the Bay of Mirabella in eastern Crete. Excavation was conducted in September 1991 by members of the American School of Classical Studies at Athens, and under the auspices and general directorship of Metaxia Tsipopoulou and Costis Davaras of the Greek Archaeological Service of eastern Crete.
The Late Minoan Iiic Pottery From The Kastro At Kavousi, East Crete, Margaret S. Mook, William D.E. Coulson
The Late Minoan Iiic Pottery From The Kastro At Kavousi, East Crete, Margaret S. Mook, William D.E. Coulson
Margaret S. Mook
The last phase of the Bronze Age on Crete, Late Minoan IIIC, is poorly understood both culturally and chronologically. Although much has been said about the shapes and decoration of LM IIIC pottery, the analyses are primarily stylistic and lack a precise stratigraphical basis. The stylistic development within the pottery sequence is ill defined because the remains from type sites (such as Kastri, Karphi, and Phaistos) are incompletely published, extremely meager, or stratigraphically discontinuous. On the Kastro at Kavousi, however, three distinct chronological phases of LM IIIC occupation, representing the entirety of the period, in addition to a transitional LM …
Interim Report On Data And Methods For Assessment Of 2,3,7,8-Tetrachlorodibenzo-P-Dioxin Risks To Aquatic Life And Associated Wildlife, Steven P. Bradbury, Philip M. Cook, Russell J. Erickson, Robert L. Spehar, Gerald T. Ankney
Interim Report On Data And Methods For Assessment Of 2,3,7,8-Tetrachlorodibenzo-P-Dioxin Risks To Aquatic Life And Associated Wildlife, Steven P. Bradbury, Philip M. Cook, Russell J. Erickson, Robert L. Spehar, Gerald T. Ankney
Steven P. Bradbury
In April, 1991 the Administrator of the U.S. Environmental Protection Agency (EPA) announced that the Agency would conduct a scientific reassessment of the risk of 2,3,7,8-tetrachlorodibenzo-p-dioxin (hereafter referred to as TCDD), and similar chemicals, to human health and the environment. Since 1985, EPA has classified TCDD, which it considers the most potent known animal carcinogen, as a probable human carcinogen. Sources of TCDD in the environment were subsequently regulated on the basis of animal cancer rates extrapolated to doses associated with human exposures. Recently, consensus has developed that the toxic effects of TCDD appear to be mediated by its binding …
Ligand Binding By A Recombinant Insect Juvenile Hormone Binding Protein, Kazushige Touhara, Keith A. Lerro, Bryony C. Bonning, Bruce D. Hammock, Glenn D. Prestwich
Ligand Binding By A Recombinant Insect Juvenile Hormone Binding Protein, Kazushige Touhara, Keith A. Lerro, Bryony C. Bonning, Bruce D. Hammock, Glenn D. Prestwich
Bryony C. Bonning
A cDNA for the hemolymph juvenile hormone binding protein (JHBP) of larval Manduca sexta has been isolated, sequenced, and expressed in an insect cell line. A recombinant baculovirus, containing the JHBP cDNA fused to the p10 promoter of Autographa californica nuclear polyhedrosis virus, was constructed. Insect cells (Sf9) infected with this virus secreted recombinant JHBP (rJHBP) into the medium (>50 pg/mL), and cotranslational removal of an 18 amino acid leader sequence was observed. rJHBP was cross-reactive with an antiserum prepared to the hemolymph JHBP and was specifically labeled by [3H]EHDA, a photoaffinity analog of JH 11, demonstrating that rJHBP …
Measuring Security Price Perfonnance Using Daily Returns: Issues Associated With Using Nasdaq Securities, Cynthia J. Campbell, Charles E. Wasley
Measuring Security Price Perfonnance Using Daily Returns: Issues Associated With Using Nasdaq Securities, Cynthia J. Campbell, Charles E. Wasley
Cynthia J. Campbell
This study addresses issues that arise when using daily NASDAQ security returns in event studies. Its objective is to provide benchmarks for assessing the impact of alternative research design choices. The results indicate that test statistics commonly used in event studies are subject to varying degrees of misspecification in samples of NASDAO securities. Misspecification is most severe for traditional z-statistics based on standardized abnormal returns. Across a wide variety of event study settings the rank statistic introduced in Corrado (1989) is consistently well-specified and quite powerful in detecting abnormal performance.
Insertion Reactions Of Monovalent Silicon: A Nonvanishing Barrier For The Silylidyne Plus Hydrogen Reaction Sih + H2, Mark S. Gordon, Yaoming Xie, Yukio Yamaguchi, Roger S. Grev, Henry F. Schaefer Iii
Insertion Reactions Of Monovalent Silicon: A Nonvanishing Barrier For The Silylidyne Plus Hydrogen Reaction Sih + H2, Mark S. Gordon, Yaoming Xie, Yukio Yamaguchi, Roger S. Grev, Henry F. Schaefer Iii
Mark S. Gordon
Ab initio quantum mechanical methods have been applied to the SiH (X zrr) insertion into the Hz molecule. The transition state has no elements of symmetry. The classical barrier height is predicted to be 5.6 :I: I kcaljmol. The barrier is qualitatively consistent with an estimate from Jasinski's experimental reaction rates, which are much slower than those observed for the related CH + Hz, SiH + SiH4, and SiH2 + Hz reactions.
Protection Of Pasteurella Multocida Dermonecrotic Toxin-Challenged Rats By Toxoid-Induced Antibody, R. K. Pettit, R. B. Rimler, Mark R. Ackermann
Protection Of Pasteurella Multocida Dermonecrotic Toxin-Challenged Rats By Toxoid-Induced Antibody, R. K. Pettit, R. B. Rimler, Mark R. Ackermann
Mark R. Ackermann
Two different doses of glutaraldehyde-treated Pasteurella multocida dermonecrotic toxin (PMDT) were used to immunize rats. Rats developed serum IgG antibodies specific for native PMDT, and IgG titers increased with dose and number of toxoid immunizations. Survival rates in both active immunization and passive serum neutralization experiments were dependent on dose of toxoid vaccination and serum levels of anti-PMDT IgG. Vaccination with toxoid prevented weight loss but not leukocytosis and increased complement titers in toxin-challenged rats. Toxoid, itself, induced minimal leukocytosis but no alterations in complement titers or weight gain.
Isolation Of Listeria Spp. From Feces Of Feedlot Cattle, James S. Dickson, G. R. Siragusa, E. K. Daniels
Isolation Of Listeria Spp. From Feces Of Feedlot Cattle, James S. Dickson, G. R. Siragusa, E. K. Daniels
James S. Dickson
Healthy feedlot beef cattle were surveyed for the presence of Listeria spp. in fecal grab samples taken over 3 months. Composite samples were made from 224 individual animals each month. Listeria monocytogenes was isolated from one composite sample (4%) from the first sampling and not from the subsequent two. Listeria innocua was found in composite samples from all three samplings at levels of 17, 9, and 35%, respectively. From the individual samples comprising the Listeria spp.—positive composites, L. monoytogenes was isolated from one sample (3%) in the second sampling but not in the first or third samplings. L. innocua was …
Toxicokinetics And Metabolism Of Aniline And 4-Chloroaniline In Medaka (Oryzias Latipes), Steven P. Bradbury, Julia M. Dady, Patrick N. Fitzsimmons, Michelle M. Voit, Dean E, Hammermeister, Russell J. Erickson
Toxicokinetics And Metabolism Of Aniline And 4-Chloroaniline In Medaka (Oryzias Latipes), Steven P. Bradbury, Julia M. Dady, Patrick N. Fitzsimmons, Michelle M. Voit, Dean E, Hammermeister, Russell J. Erickson
Steven P. Bradbury
The in vivo toxicokinetics and in vitro hepatic microsomal metabolism of (14C)aniline and (14C)4-chloroaniline in medaka (Oryzias latipes) were investigated to provide a basis upon which to interpret the toxicological responses of small aquarium fish to aniline derivatives. During static aqueous exposures of up to 320 min, parent equivalents failed to reach steady state and results from depuration studies clearly demonstrated biphasic elimination. Due to low elimination rates, 40 to 20% of absorbed aniline and 4-chloroaniline doses, respectively, remained within the fish through 330 min postexposure. Based on an analysis of excreted metabolites, N-acetylation was the dominant route of in …
A Non-Invasive Neurotoxicity Assay Using Larval Medaka, Steven P. Bradbury, Dave Featherstone, Charles D. Drewes, Joel R. Coats
A Non-Invasive Neurotoxicity Assay Using Larval Medaka, Steven P. Bradbury, Dave Featherstone, Charles D. Drewes, Joel R. Coats
Steven P. Bradbury
We present a method for non-invasive electrophysiological analysis of rapid escape responses in intact, freely behaving larval medaka (Oryzias latipes) before and after short-term exposure to environmental toxicants. Recordings are obtained as a larval medaka swims in a small chamber of water above pairs of recording electrodes etched onto a printed circuit board. When the chamber is briefly vibrated by a sinusoidal pulse from a speaker attached to the grid, a stereotyped Mauthner cell-initiated escape response is evoked. The following parameters were quantified from recordings: 1) Mauthner axon conduction velocity, 2) delay between Mauthner axon spike and motoneuron spike in …
Tables Of Coincidence Orientations For Ordered Tetragonal L Lo Alloys For A Range Of Axial Ratios, Abha Singh, Alexander H. King
Tables Of Coincidence Orientations For Ordered Tetragonal L Lo Alloys For A Range Of Axial Ratios, Abha Singh, Alexander H. King
Alexander H. King
In this paper we develop and apply techniques for computation of CSL, DSCL and step-vector data for grain boundaries in tetragonal materials for a range of axial ratios. This has application to L10 alloys including TiA1, which is a candidate for lightweight high-temperature structural applications. Our results are compared with others and found to be more accurate and complete. We provide data for a wider range of axial ratios than those considered by previous workers. We have also derived equivalent quaternions for tetragonal crystals in tetragonal-crystal coordinates and listed conditions for selecting a unique reduced rotation in tetragonal-crystal coordinates so …
Heterophil Chemotaxis In Chickens With Natural Staphylococcal Infections, James R. Andreasen Jr., Claire B. Andreasen, Mohammad Anwer, Anita E. Sonn
Heterophil Chemotaxis In Chickens With Natural Staphylococcal Infections, James R. Andreasen Jr., Claire B. Andreasen, Mohammad Anwer, Anita E. Sonn
Claire B. Andreasen
Heterophil chemotaxis using heterophils isolated from the peripheral blood of five commercial broiler chickens naturally infected with staphylococcal bacteria was compared by the modified Boyden-chamber technique with chemotaxis of heterophils from two chickens from the same flock not infected with Staphylococcus (field controls) and from four healthy laboratory control broiler chickens. The infected chickens had gross and histologic lesions of staphylococcal tenosynovitis and osteomyelitis. Staphylococci were isolated from the lesions. Hematologic parameters and histologic lesions of infected chickens also were examined. Compared with field and laboratory controls, Staphylococcus-infected chickens had heterophilic leukocytosis. The heterophils of Staphylococcus-infected chickens had significantly lower …
Acting Naturally: Cultural Distinction And Critiques Of Pure Country, Barbara Ching
Acting Naturally: Cultural Distinction And Critiques Of Pure Country, Barbara Ching
Barbara Ching
Country music has the fastest-growing audience in America but it is still rather scandalous for an intellectual to admit to liking it. Contemporary cultural theory—which is to say cultural studies—has thus had practically nothing to say about it. At first glance, it may seem that everything has already been said. I know well enough that many people find country music to be dumb, reactionary, sentimental, maudlin, primitive, etc. Still others, perhaps influenced one way or another by the Frankfurt school, sneer at what they feel is the contrived, hokey, convention-bound nature of the music: they hear a commodification and cheapening …
A Geometrical Rationalization Of The Special Properties Of The 14° [001] Grain Boundary In Yba2cu3o7−Δ, Alexander H. King, Abha Singh
A Geometrical Rationalization Of The Special Properties Of The 14° [001] Grain Boundary In Yba2cu3o7−Δ, Alexander H. King, Abha Singh
Alexander H. King
14° [001] tilt grain boundaries in YBa2Cu3O7−δ have been found to exhibit anomalously good superconducting critical currents, associated with magnetic flux pinning, although no special interfacial structure has heretofore been associated with this misorientation. We present an analysis of the geometry of the grain boundary in question and show that it can correspond to a special interface, within the definition of constrained lattice coincidence, which may lead to new understanding of the superconducting behavior of grain boundaries. Our analysis shows that the tetragonal‐to‐orthorhombic phase transformation may have important effects upon grain boundary structure and properties, indicating new approaches to producing …
Doping And Pressure Studies On Ybbipt, A. Lacerda, R. Movshovich, M. F. Hundley, Paul C. Canfield, D. Arms, G. Sparn, J. D. Thompson, Z. Fisk, N. E. Philips, H.-R. Ott
Doping And Pressure Studies On Ybbipt, A. Lacerda, R. Movshovich, M. F. Hundley, Paul C. Canfield, D. Arms, G. Sparn, J. D. Thompson, Z. Fisk, N. E. Philips, H.-R. Ott
Paul C. Canfield
The compound YbBiPt exhibits an extremely large low‐temperature C/T (γ∼8 J K−2 mol−1/Yb) which, if due solely to a renormalized effective mass, would make this material the heaviest correlated electron system known to date. In the Kondo model, the very large γ corresponds to a small characteristic energy scale that is expected to be pressure dependent. We have studied the effect of chemical pressure on YbBiPt single crystals by heat‐capacity measurements on Y and Lu‐doped samples. We have also made preliminary low‐temperature measurements under hydrostatic pressure of the heat capacity (300 mK≤T≤2 K, up to 8 kbar) and resistance (30 …
Chicken Heterophil Chemotaxis Using Staphylococcus-Generated Chemoattractants, James R. Andreasen Jr., Claire B. Andreasen, Mohammad Anwer, Anita E. Sonn
Chicken Heterophil Chemotaxis Using Staphylococcus-Generated Chemoattractants, James R. Andreasen Jr., Claire B. Andreasen, Mohammad Anwer, Anita E. Sonn
Claire B. Andreasen
Heterophil chemotaxis, in response to chemotactic factors generated by three different strains of staphylococcal bacteria, was measured using the modified Boyden-chamber technique. Heterophils were obtained from healthy 6-to-8-week-old broiler chickens. Each bacterial strain generated factors that were chemotactic for chicken heterophils. Factors generated by two pathogenic isolates of Staphylococcus aureus, however, induced significantly greater chemotaxis in chicken heterophils than those generated by a nonpathogenic Staphylococcus isolate.