105,238 research outputs found
Review: ``From Newton to Boltzmann: Hard Spheres and Short-range Potentials''
No full textReview of: From Newton to Boltzmann: Hard Spheres and Short-range Potentials, by Isabelle Gal- lagher, Laure Saint-Raymond and Benjamin Texier, Zurich Lectures in Advanced Mathematics, vol. 18, European Mathematical Society, Zu ̈rich, 2014, xi+135 pp., ISBN 978-3- 03719-129-3
Kinetic roughening of a terrace ledge
No full textWe study the motion of an isolated terrace ledge on a crystalline surface within the framework of the terrace-ledge-kink model. We argue that for length scales larger than the diffusion length the step roughness is governed by the Kardar-Parisi-Zhang (KPZ) equation that predicts a broadening as t1/3. For smaller length scales a variety of possibilities are explored. Their occurrence depends sensitively on the rates for the adsorption and desorption processes both on the terraces and at the ledge. The ledge could be unstable, developing a fractal, dendritic type of structure. If the ledge is stable, we obtain a crossover from a t1/6 (conserved dynamics, model B) to a t1/4 (nonconserved dynamics, model A) and a t1/3 (KPZ) broadening
explore, Spring 2007, Vol. 10, no. 2: William C. Spohn\u27s Contributions to Theological Scholarship
No full textContents: Follow the Friendships: The Work of William Spohn; Hearers and Doers of the Word: The Challenge of William C. Spohn to Scripture and Ethics; Jesus and the Moral Life: Edwards, H. R. Niebuhr, and Spohn; William C. Spohn\u27s Contribution to Moral Theology; Where Do We Go From Here? Ways We Can Build on Spohn’s Contributions; Bannan Grant Report: Shakespeare at San Quentin - Santa Clara Students Perform Shakespeare For and With Inmates; Spohn Memorial Fund and Next Issuehttps://scholarcommons.scu.edu/explore/1025/thumbnail.jp
Rendering of Corrin Hall
No full textThe information on the blueprint reads: "Scale 1/8" - 1'0"; Womans' Dormitory - Corrin Hall, Rollins College - Winter Park - Florida, Dr. Hamilton Holt President; George H. Spohn, Architect, May 6, 1946.
Small-angle x-ray scattering under grazing incidence: The cross section in the distorted-wave Born approximation
No full textThe specular and nonspecular intensity of x rays scattered from a rough surface with fluctuations in the electron density is calculated in the distorted-wave Born approximation. The contributions to the nonspecular intensity of roughness and density fluctuations can be separated. The structure factor is given by a convolution integral of the Fourier transform of the density correlation function. Special geometries of density fluctuations are discussed
Motility of Helicobacter priori is coordinately regulated by the transcriptional activator FlgR, an NtrC homolog
No full textσ54 is the subunit of bacterial RNA polymerase that transcribes from promoters with enhancer elements bound by enhancer-binding proteins. By computer searches of Helicobacter pylori genomic sequences, chromosomal gene disruption, and RNA analyses, we have identified σ54-recognized promoters that regulate transcription of flagellar basal body and hook genes, as well as the enhancer-binding protein FlgR (flagellum regulator), a transactivating protein of the NtrC family. We demonstrate that FlgR is required for bacterial motility and transcription of five promoters for seven basal body and hook genes. In addition, FlgR acts as a repressor of transcription of the σ28-regulated flaA flagellin gene promoter, while changes in DNA topology repress transcription of the σ54-regulated flaB flagellin gene promoter. Our data indicate that regulation of flagellar gene expression in H. priori shows similarities with that in enterobacteriaceae and Caulobacter
The autoregulatory HspR repressor protein governs chaperone gene transcription in Helicobacter pylori
No full textIn the present study, we provide evidence that the groESL, hrcA-grpE-dnaK and cbpA-hspR-orf operons encoding the major chaperones of the human gastric pathogen Helicobacter pylori are transcribed by the vegetative sigma factor σ80 and are regulated negatively by the transcriptional repressor HspR. In vitro studies with purified recombinant HspR protein established that the protein represses transcription by binding to large DNA regions centred around the transcription initiation site in the case of the P(cbp) promoter, and around -85 and -120 in the case of the P(gro) and P(hrc) promoters respectively. All three binding sites contain DNA motifs with some similarity to the HAIR sequence identified as a consensus for the HspR protein of Streptomyces. In contrast to the situation in Streptomyces, in which transcription of HspR-regulated genes is induced in response to heat shock, transcription of the HspR-dependent genes in H. pylori is not inducible by thermal stimuli. Transcription of the groESL and cbpA-hspR-orf operons is induced by osmotic shock, while transcription of the hrcA-grpE-dnaK operon, although HspR dependent, is not affected by salt treatment. The possibility that HspR could constitute a global transcriptional regulator for diverse cellular functions with implications for pathogenesis is discussed
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