The zoonotic potential of dogs in Aboriginal communities in Central Australia.

This article reviews the established zoonoses from dogs, and identifies the potential burden of speculative zoonoses of canine origin in Aboriginal communities in Central Australia. A variety of organisms such as bacteria, viruses, and parasites including protozoa, ectoparasites and helminths (worms) have possible zoonotic capability; these organisms are discussed. Observational research was conducted in seven Aboriginal Town Camps of Alice Springs to describe the human and dog interactions and behaviours, and risk factors for transmission. Information was also gathered on the cultural significance of dogs to Aboriginal people in the community under observation. The relationship between Aboriginal people and their dogs appears to be not only one of companionship, but involves other more complex cultural factors. The contribution dogs make to infections and infestations of Aboriginal people in communities throughout Australia remains unclear. Education and dog health programs have an important role in reducing the risk of canine-related human morbidity in Aboriginal communities.Sharyn Gaskin, Richard Bentham, Nancy Cromar and Howard Fallowfiel

Master of Science

thesisMyasthenia Gravis (MG) is a neuromuscular autoimmune disease primarily associated with the presence of antibodies directed toward receptors embedded in the motor end-plate at the neuromuscular junction (NMJ). These antibodies cause blockage, dysfunction, and degradation of acetylcholine receptors (AChR) leading to muscle weakness and fatigability. Three main types of AChR antibodies have been identified and are referred to as binding, modulating, and blocking. Detection of acetylcholine receptor antibodies through the use of a radio-label has become standard procedure in most laboratories. Known drawbacks are associated with radioimmunoassay; cost of radioisotopes, hazards to laboratory professionals, and manufacture and disposal of radioactive materials have prompted investigation into replacement assays. In 2009, scientists described a method of detecting AChR modulating antibodies using flow cytometric techniques. They utilized fluorescently-labeled molecules to aid in the detection of modulated AChR and to confirm the presence of AChR modulating antibodies. We postulate that similar techniques could enable the conversion of the AChR blocking assay to flow cytometry as well. Described here is a high-throughput immunofluorescent flow cytometric assay designed for the detection of AChR blocking antibodies. Three-hundred-twenty-four sera were tested on both the AChR blocking radio-assay and the new immunofluorescent flow cytometric assay. Analysis of the results revealed a 96.9% concordance between the two assay methodologies. Our results indicate that a new immunofluorescent flow cytometric AChR blocking antibody assay is not only feasible, but clinically comparable in both sensitivity (91%) and specificity (99%) when compared to radio-assay

Workshop - Virtual Involvement Plan

This is a Workshop offered during the AIS 2021 National Student Leadership Conference (SCLC)

Detectability of gravitational wave events by spherical resonant-mass antennas

We have calculated signal-to-noise ratios for eight spherical resonant-mass antennas interacting with gravitational radiation from inspiralling and coalescing binary neutron stars and from the dynamical and secular bar-mode instability of a rapidly rotating star. We find that by using technology that could be available in the next several years, spherical antennas can detect neutron star inspiral and coalescence at a distance of 15 Mpc and the dynamical bar-mode instability at a distance of 2 Mpc.Comment: 39 pages, 4 EPS Figures, some additional SNRs for secular instabilities, some changes to LIGO SNRs, Appendix added on the asymptotic expansion of energy sensitivity, corrected supernova rates. Results available at http://www.physics.umd.edu/rgroups/gen_rel_exp/snr.html Submitted to Phys. Rev.

Ambient particulate matter air pollution exposure and mortality in the NIH-AARP diet and health cohort

BACKGROUND: Outdoor fine particulate matter (≤ 2.5 μm; PM2.5) has been identified as a global health threat, but the number of large U.S. prospective cohort studies with individual participant data remains limited, especially at lower recent exposures. OBJECTIVES: We aimed to test the relationship between long-term exposure PM2.5 and death risk from all nonaccidental causes, cardiovascular (CVD), and respiratory diseases in 517,041 men and women enrolled in the National Institutes of Health-AARP cohort. METHODS: Individual participant data were linked with residence PM2.5 exposure estimates across the continental United States for a 2000–2009 follow-up period when matching census tract–level PM2.5 exposure data were available. Participants enrolled ranged from 50 to 71 years of age, residing in six U.S. states and two cities. Cox proportional hazard models yielded hazard ratio (HR) estimates per 10 μg/m3 of PM2.5 exposure. RESULTS: PM2.5 exposure was significantly associated with total mortality (HR = 1.03; 95% CI: 1.00, 1.05) and CVD mortality (HR = 1.10; 95% CI: 1.05, 1.15), but the association with respiratory mortality was not statistically significant (HR = 1.05; 95% CI: 0.98, 1.13). A significant association was found with respiratory mortality only among never smokers (HR = 1.27; 95% CI: 1.03, 1.56). Associations with 10-μg/m3 PM2.5 exposures in yearly participant residential annual mean, or in metropolitan area-wide mean, were consistent with baseline exposure model results. Associations with PM2.5 were similar when adjusted for ozone exposures. Analyses of California residents alone also yielded statistically significant PM2.5 mortality HRs for total and CVD mortality. CONCLUSIONS: Long-term exposure to PM2.5 air pollution was associated with an increased risk of total and CVD mortality, providing an independent test of the PM2.5–mortality relationship in a new large U.S. prospective cohort experiencing lower post-2000 PM2.5 exposure levels. CITATION: Thurston GD, Ahn J, Cromar KR, Shao Y, Reynolds HR, Jerrett M, Lim CC, Shanley R, Park Y, Hayes RB. 2016. Ambient particulate matter air pollution exposure and mortality in the NIH-AARP Diet and Health cohort. Environ Health Perspect 124:484–490; http://dx.doi.org/10.1289/ehp.150967

Comparison of advanced gravitational-wave detectors

We compare two advanced designs for gravitational-wave antennas in terms of their ability to detect two possible gravitational wave sources. Spherical, resonant mass antennas and interferometers incorporating resonant sideband extraction (RSE) were modeled using experimentally measurable parameters. The signal-to-noise ratio of each detector for a binary neutron star system and a rapidly rotating stellar core were calculated. For a range of plausible parameters we found that the advanced LIGO interferometer incorporating RSE gave higher signal-to-noise ratios than a spherical detector resonant at the same frequency for both sources. Spheres were found to be sensitive to these sources at distances beyond our galaxy. Interferometers were sensitive to these sources at far enough distances that several events per year would be expected

Trophic positioning of meiofauna revealed by stable isotopes and food-web analyses

Despite important advances in the ecology of river food-webs, the strength and nature of the connection between the meio- and macrofaunal components of the web are still debated. Some unresolved issues are the effects of the inclusion of meiofaunal links and their temporal variations on the overall river food web properties, and the significance of autochtonous and allochtonous material for these components. In the present study we conducted gut content of macro- and meiofauna, and stable isotope analyses of meiofauna to examine seasonal food webs of a chalk stream. The results of the gut content analyses, confirmed by the δ13C signatures, revealed a seasonal shift from a dependence on autochthonous (biofilm) to allochthonous food sources. Here, we demonstrate that aggregating basal or meiofaunal species into single categories affects key web properties such as web size, links, linkage density, and predator-prey ratios. More importantly, seasonal variation in attributes characterized the entire web and these changes persist regardless of taxonomic resolution. Furthermore, our analyses evidenced discrete variations in δ15N across the meiofauna community with a trophic structure that confirms gut content analyses, placing the meiofauna high in the food web. We, therefore, conclude that small body-sized taxa can occur high in dynamic river food webs, questioning assumptions that trophic position increases with body size and that webs are static