Foreword to 5th International Conference on Whole Body Vibration Injuries held at Academic Medical Center, University of Amsterdam, The Netherlands, 5-7 June 2013

Foreword to 5th International Conference on Whole Body Vibration Injuries held at Academic Medical Center, University of Amsterdam, The Netherlands, 5-7 June 201

Zero Modes and the Atiyah-Singer Index in Noncommutative Instantons

We study the bosonic and fermionic zero modes in noncommutative instanton backgrounds based on the ADHM construction. In k instanton background in U(N) gauge theory, we show how to explicitly construct 4Nk (2Nk) bosonic (fermionic) zero modes in the adjoint representation and 2k (k) bosonic (fermionic) zero modes in the fundamental representation from the ADHM construction. The number of fermionic zero modes is also shown to be exactly equal to the Atiyah-Singer index of the Dirac operator in the noncommutative instanton background. We point out that (super)conformal zero modes in non-BPS instantons are affected by the noncommutativity. The role of Lorentz symmetry breaking by the noncommutativity is also briefly discussed to figure out the structure of U(1) instantons.Comment: v3: 24 pages, Latex, corrected typos, references added, to appear in Phys. Rev.

On the mechanisms governing gas penetration into a tokamak plasma during a massive gas injection

A new 1D radial fluid code, IMAGINE, is used to simulate the penetration of gas into a tokamak plasma during a massive gas injection (MGI). The main result is that the gas is in general strongly braked as it reaches the plasma, due to mechanisms related to charge exchange and (to a smaller extent) recombination. As a result, only a fraction of the gas penetrates into the plasma. Also, a shock wave is created in the gas which propagates away from the plasma, braking and compressing the incoming gas. Simulation results are quantitatively consistent, at least in terms of orders of magnitude, with experimental data for a D 2 MGI into a JET Ohmic plasma. Simulations of MGI into the background plasma surrounding a runaway electron beam show that if the background electron density is too high, the gas may not penetrate, suggesting a possible explanation for the recent results of Reux et al in JET (2015 Nucl. Fusion 55 093013)

Reproductive characteristics of invasive hyperparasitoid Baeoanusia albifunicle have implications for the biological control of eucalypt pest Paropsis charybdis

Hyperparasitoids can impede the establishment of primary parasitoid biological control agents or limit their control capacity. Although modern quarantine practices generally prevent hyperparasitoids being introduced with biological control agents, introductions can occur via natural pathways or accidentally with incoming passengers and cargo. In New Zealand, Baeoanusia albifunicle Girault is a self-introduced hyperparasitoid of Enoggera nassaui Girault, an intentionally introduced control agent of the eucalypt pest Paropsis charybdis Stål. A self-introduced primary parasitoid, Neopolycystus insectifurax (Girault), also parasitises P. charybdis in New Zealand. We assessed B. albifunicle biology to better understand its potential to disrupt P. charybdis control. It was determined that B. albifunicle is an obligate solitary hyperparasitoid with a longer lifespan, lower fecundity and longer generation time than its host. The hyperparasitoid reduced effective parasitism by E. nassaui to <10% in the lab, indicating it may limit control of the first P. charybdis generation by slowing spring population growth. It was confirmed that N. insectifurax is not hyperparasitised by B. albifunicle and therefore has some potential to substitute for any hyperparasitoid-driven decline in E. nassaui

Symmetries of a class of nonlinear third-order partial differential equations

In this paper, we study symmetry reductions of a class of nonlinear third-order partial differential equations (1) U-t - epsilon u(xxt) + 2 kappa u(x) = uu(xxx) + alpha uu(x) + beta u(x)u(xx), where epsilon, kappa, alpha, and beta are arbitrary constants. Three special cases of equation (1) have appeared in the literature, up to some rescalings. In each case, the equation has admitted unusual travelling wave solutions: the Fornberg-Whitham equation, for the parameters epsilon = 1, alpha = -1, beta = 3, and kappa = 1/2, admits a wave of greatest height, as a peaked limiting form of the travelling wave solution; the Rosenau-Hyman equation, for the parameters epsilon = 0, alpha = 1, beta = 3, and kappa = 0, admits a ''compacton'' solitary wave solution; and the Fuchssteiner-Fokas-Camassa-Holm equation,for the parameters epsilon = 1, alpha = -3, and beta = 2, has a ''peakon'' solitary wave solution. A catalogue of symmetry reductions for equation (1) is obtained using the classical Lie method and the nonclassical method due to Bluman and Cole

Specificity of interaction between carcinogenic polynuclear aromatic hydrocarbons and nuclear proteins: widespread occurrence of a restricted pattern of histone-binding in intact cells

Metabolic activation of benzo(a)pyrene (B(a)P) produces a number of potentially reactive metabolites. The endproducts of one metabolic pathway, 7,8-dihydroxy-9,10-oxy-7,8,9,10-tetrahydro-B(a)P (BPDE) are responsible for essentially all DNA adduct formation in animal cells treated with B(a)P, and a particular stereoisomer, designated (+)-anti-BPDE is thought to be the ultimate carcinogenic derivative of B(a)P. In hamster embryo cell nuclei treated with (+)-anti-BPDE, two of the histones of the nucleosomal core, H3 and H2A, are covalently modified, while the remaining core histones, H4 and H2B, are essentially unmodified. All four purified core histones, however, serve as targets. 7,12-dimethylbenz(a)anthracene and 3-methylcholanthrene show the same pattern of histone binding in hamster embryo cells. Treatment of mouse embryo cells with (/sup 3/H)-BPDE results in covalent binding of the hydrocarbon to histones H3 and H2A among the many cellular targets, while histones H2B and H4 are not bound. Similar binding patterns are seen in mouse embryo cells, a permanent murine, fibroblastic cell line, and a human mammary epithelial cell line, T47D, treated with (/sup 3/H)B(a)P. Again, the histones are unevenly labeled, displaying the H3 and H2A pattern. Histone-binding in the human cells may also be mediated by BPDE. Similar BPDE binding patterns were observed in other murine and human cell lines and in primary cultures of murine epidermal epithelial cells. The restriction of histone H2B and H4 binding appears to be general when intact cultured cells are studied. This specificity was not observed in a mixed reconstituted system in which rat liver microsomes were used to activate B(a)P. This finding reinforces reservations concerning the use of microsomal systems to probe the interactions of carcinogens with macromolecules and the relationships of adduct formation with the processes of carcinogenesis. (ERB

Resilience of veterinarians at different career stages: The role of self‐efficacy, coping strategies and personal resources for resilience in veterinary practice

Background The aim of this study was to determine the effect of demographic and psychological factors on resilience in new graduate-, mid- and late-career veterinarians working in Australia. Method An online cross-sectional survey of 800 veterinarians collected demographic and descriptive data in two stages from late 2015 to 2017, such as gender, average hours worked per week, type and region of practice and intention to leave veterinary medicine. Psychological factors were measured utilising the Brief Resilience Scale, the Veterinary Resilience Scale–Personal Resources, the Brief COPE and General Self-Efficacy measures. Results Using a full-factorial univariate General Linear Model, no significant difference in general resilience was evident between the three career-stage groups (p > 0.05). However, higher self-efficacy, higher personal resources for resilience in veterinary practice, and lower problem-focused, higher emotion-focused and lower dysfunctional coping strategies were related to higher resilience. In the model for mid- and late-career veterinarians, a weak positive relationship existed between higher average hours worked per week and higher resilience, while intention to leave veterinary practice was also related to lower resilience in mid- and late-career veterinarians. Conclusion This study supports the value of personal resources, rather than career stage, gender or region of work, as influential in developing veterinarian resilience