145 research outputs found

    The Balby Seekers and Richard Farnworth

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    This paper describes the group of Seekers which flourished briefly in 1650 and 1651 around Balby, Warmsworth and Tickhill in South Yorkshire, and explores their origins. They may have numbered up to thirty, and had developed as radical puritans independently of any immediate local Separatist tradition or Grindletonian influence. They joined with George Fox on his arrival around December 1651, providing several pioneers who helped in launching the Quaker movement. These included Richard Farnworth, Thomas Aldam, Benjamin Nicholson, and John, Thomas and Margaret Killam, with Thomas and Elizabeth Stacy from Ballifield near Sheffield. Evidence is presented that Farnworth was born on 14th October 1627, and that he may have first encountered George Fox at Derby in early 1650

    Radio source calibration for the VSA and other CMB instruments at around 30 GHz

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    Accurate calibration of data is essential for the current generation of CMB experiments. Using data from the Very Small Array (VSA), we describe procedures which will lead to an accuracy of 1 percent or better for experiments such as the VSA and CBI. Particular attention is paid to the stability of the receiver systems, the quality of the site and frequent observations of reference sources. At 30 GHz the careful correction for atmospheric emission and absorption is shown to be essential for achieving 1 percent precision. The sources for which a 1 percent relative flux density calibration was achieved included Cas A, Cyg A, Tau A and NGC7027 and the planets Venus, Jupiter and Saturn. A flux density, or brightness temperature in the case of the planets, was derived at 33 GHz relative to Jupiter which was adopted as the fundamental calibrator. A spectral index at ~30 GHz is given for each. Cas A,Tau A, NGC7027 and Venus were examined for variability. Cas A was found to be decreasing at 0.394±0.0190.394 \pm 0.019 percent per year over the period March 2001 to August 2004. In the same period Tau A was decreasing at 0.22±0.070.22\pm 0.07 percent per year. A survey of the published data showed that the planetary nebula NGC7027 decreased at 0.16±0.040.16\pm 0.04 percent per year over the period 1967 to 2003. Venus showed an insignificant (1.5±1.31.5 \pm 1.3 percent) variation with Venusian illumination. The integrated polarization of Tau A at 33 GHz was found to be 7.8±0.67.8\pm 0.6 percent at pa =148±3 = 148^\circ \pm 3^\circ.}Comment: 13 pages, 15 figures, submitted to MNRA

    Detection of the florfenicol resistance gene floR in Chryseobacterium isolates from rainbow trout. Exception to the general rule?

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    Bacteria from the family Flavobacteriaceae often show low susceptibility to antibiotics. With the exception of two Chryseobacterium spp. isolates that were positive for the florfenicol resistance gene floR, no clinical resistance genes were identified by microarray in 36 Flavobacteriaceae isolates from salmonid fish that could grow in ≥ 4 mg/L florfenicol. Whole genome sequence analysis of the floR positive isolates revealed the presence of a region that contained the antimicrobial resistance genes floR, a tet(X) tetracycline resistance gene, a streptothricin resistance gene and a chloramphenicol acetyltransferase gene. In silico analysis of 377 published genomes for Flavobacteriaceae isolates from a range of sources confirmed that well-characterised resistance gene cassettes were not widely distributed in bacteria from this group. Efflux pump-mediated decreased susceptibility to a range of antimicrobials was confirmed in both floR positive isolates using an efflux pump inhibitor (phenylalanine-arginine β-naphthylamide) assay. The floR isolates possessed putative virulence factors, including production of siderophores and haemolysins, and were mildly pathogenic in rainbow trout. Results support the suggestion that, despite the detection of floR, susceptibility to antimicrobials in Flavobacteriaceae is mostly mediated via intrinsic mechanisms rather than the horizontally acquired resistance genes more normally associated with Gram-negative bacterial pathogens such as Enterobacteriaceae

    Virtual Machine Support for Many-Core Architectures: Decoupling Abstract from Concrete Concurrency Models

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    The upcoming many-core architectures require software developers to exploit concurrency to utilize available computational power. Today's high-level language virtual machines (VMs), which are a cornerstone of software development, do not provide sufficient abstraction for concurrency concepts. We analyze concrete and abstract concurrency models and identify the challenges they impose for VMs. To provide sufficient concurrency support in VMs, we propose to integrate concurrency operations into VM instruction sets. Since there will always be VMs optimized for special purposes, our goal is to develop a methodology to design instruction sets with concurrency support. Therefore, we also propose a list of trade-offs that have to be investigated to advise the design of such instruction sets. As a first experiment, we implemented one instruction set extension for shared memory and one for non-shared memory concurrency. From our experimental results, we derived a list of requirements for a full-grown experimental environment for further research
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