Soil moisture mediated interaction between Polygonatum biflorum and leaf spot disease

Fungal pathogens can regulate the abundance and distribution of natural plant populations by inhibiting the growth, survival, and reproduction of their hosts. The abiotic environment is a crucial component in host–pathogen interactions in natural plant populations as favorable conditions drive pathogen development, reproduction, and persistence. Foliar plant pathogens, such as fungal lesions referred to generically as “leaf spot disease,” are particularly responsive to increased moisture levels, but the manner in which the abiotic environment drives disease dynamics, and how these diseases regulate natural plant populations, is not fully understood. We investigate (1) the impact of ambient soil moisture and diffuse light on the prevalence of a leaf spot pathogen (Phyllosticta sp.) in a natural population of Polygonatum biflorum, an understory herb native to deciduous forest understories in the eastern US, and (2) the effects of the fungal pathogen on the survival, growth, and abundance of the plants. We tracked six P. biflorum populations and disease incidence, as well as soil moisture and diffuse light, between 2003 and 2005 in the understory deciduous forest of the southern Appalachian Mountains, North Carolina, USA. Results show that both the occurrence of P. biflorum and the prevalence of P. biflorum leaf spot disease are highest where soil moisture is intermediate and diffuse light is lowest. Disease occurrence depends upon plant presence, but it also adversely impacts plant survival, abundance, and growth. These results suggest that leaf spot disease is likely to impact population dynamics, which in turn vary as a function of environmental drivers

Real Welfare Reform Requires Jobs: Lessons from a Progressive Welfare Agency

This article discusses evidence from a local progressive welfare agency that has, along with other achievements, created innovate work programs within the framework of Job Opportunities and Basic Skills (JOBS). We discuss the institutional and bureaucratic limits of what such agencies can accomplish and that there has been some room for innovation for agencies that are so inclined. We then focus on two work-related innovations within the local JOBS program that demonstrate that there are many welfare clients ready and able to work in useful jobs. We take the position that government job creation is necessary to fill the employment gap left by normal labor markets and to make welfare reform effective

On the Rates of Type Ia Supernovae in Dwarf and Giant Hosts with ROTSE-IIIb

We present a sample of 23 spectroscopically confirmed Type Ia supernovae that were discovered in the background of galaxy clusters targeted by ROTSE-IIIb and use up to 18 of these to determine the local (z = 0.05) volumetric rate. Since our survey is flux limited and thus biased against fainter objects, the pseudo-absolute magnitude distribution (pAMD) of SNeIa in a given volume is an important concern, especially the relative frequency of high to low-luminosity SNeIa. We find that the pAMD derived from the volume limited Lick Observatory Supernova Search (LOSS) sample is incompatible with the distribution of SNeIa in a volume limited (z<0.12) sub sample of the SDSS-II. The LOSS sample requires far more low-luminosity SNeIa than the SDSS-II can accommodate. Even though LOSS and SDSS-II have sampled different SNeIa populations, their volumetric rates are surprisingly similar. Using the same model pAMD adopted in the SDSS-II SNeIa rate calculation and excluding two high-luminosity SNeIa from our sample, we derive a rate that is marginally higher than previous low-redshift determinations. With our full sample and the LOSS pAMD our rate is more than double the canonical value. We also find that 5 of our 18 SNeIa are hosted by very low-luminosity (M_B > -16) galaxies, whereas only 1 out 79 nearby SDSS-II SNeIa have such faint hosts. It is possible that previous works have under-counted either low luminosity SNeIa, SNeIa in low luminosity hosts, or peculiar SNeIa (sometimes explicitly), and the total SNeIa rate may be higher than the canonical value.Comment: 18 pages; accepted for publication in The Astronomical Journa

Population size bias in descendant-weighted diffusion quantum Monte Carlo simulations

We consider the influence of population size on the accuracy of diffusion quantum Monte Carlo simulations that employ descendant weighting or forward walking techniques to compute expectation values of observables that do not commute with the Hamiltonian. We show that for a simple model system, the d-dimensional isotropic harmonic oscillator, the population size must increase rapidly with d in order to ensure that the simulations produce accurate results. When the population size is too small, expectation values computed using descendant-weighted diffusion quantum Monte Carlo simulations exhibit significant systematic biases

Musculoskeletal specialist community outreach patterns : a pilot study

This poster presents the findings of a pilot study examining volunteerism among musculoskeletal specialty physicians

Exploiting opportunities for leadership development of surgeons within the operating theatre

AbstractIt is increasingly recognised that leadership skills are a key requirement in being successful in surgery, regardless of speciality and at all levels of experience and seniority. Where the emphasis was previously on technical ability, knowledge and diagnostic acumen, we now know that non-technical skills such as communication and leadership contribute significantly to patient safety, experience and outcomes, and should be valued.The operating theatre is a unique micro-environment which is often busier, noisier, more stressful and more physically demanding than the clinic or ward setting. As a result surgeons and their trainers, who are striving to develop leadership skills require an in-depth awareness of the challenges in this environment and the opportunities that arise from them to develop leadership effectively. This article outlines why leadership learning is so beneficial in the operating theatre, both for the team and the patient as well as what elements of daily routine activity such as the WHO checklist use, list-planning and audit can be exploited to transform the average busy operating theatre into a rich, learning environment for future leaders in surgery

AN ANALYSIS OF HOW THE U.S. GOVERNMENT CAN EFFECTIVELY TACKLE SUPPLY CHAIN BARRIERS TO SCALE UP THE LOW COST UNMANNED AERIAL VEHICLE (UAV) SWARMING TECHNOLOGY (LOCUST) PROGRAM

The LOCUST program is a scalable system of inexpensive swarming unmanned aerial vehicles to provide disruptive capability in contested environments against anti-area access denial defenses, enabling manned strike operations and localized landing site superiority with reduced cost, risk, and operator launch and workload. Our research and analysis will emphasize the challenges of moving from a U.S. Special Operations Command (USSOCOM) effort to a large program of record. Specific supply chain concerns that will be addressed include: 1) DOD organizational structure; 2) service-specific objectives and currently operating platforms; 3) requirements generation and related procurements to include production and quality challenges; 4) safety and quality assurance standards; 5) lead times, inventory plans, and throughput to include supplier base considerations and consolidations; and 6) latest evolving technologies and continuous improvement principles. Our team will utilize the Define, Measure, Analyze, Improve, Control (DMAIC) evaluative methodology that focuses on data-driven improvement cycles to better optimize process, design and results. Our results and recommendations highlighted multiple strategies that the Office of Naval Research (ONR) must focus on when developing the LOCUST supply chain. These conclusions and findings address both current supply chain development opportunities for the LOCUST program, as well as where the program must focus its efforts in the future.http://archive.org/details/ananalysisofhowt1094563516Civilian, Department of the NavyCivilian, Department of the ArmyCivilian, Department of the ArmyApproved for public release; distribution is unlimited

The Wildlife Society and Wildlife Damage Management Professionals

The Wildlife Society (TWS) recognizes wildlife-human interactions as both a challenge and an opportunity whereby we can serve the wildlife profession and human society. TWS first officially supported wildlife damage management professionals in 1959 when it created the TWS Committee on Economic Losses Caused by Vertebrates. In 1994, this committee ultimately became the TWS Wildlife Damage Management Working Group (WDMWG), whose goal is to better understand and manage the biological, ecological, social, political, legal, and economic aspects of wildlife-human interactions. The WDMWG has sponsored numerous symposia, workshops, publications, etc., all of which are designed to serve TWS, wildlife damage management professionals, and the public. In addition, several recent TWS publications have been designed to serve wildlife damage management professionals. TWS also has sponsored or co-sponsored technical sessions at meetings and international conferences to help disseminate the most current information on wildlife damage management. Furthermore, TWS\u27 Certified Wildlife Biologist Program can help the wildlife damage management professional achieve public trust and confidence in their scientific and technical training, as well as legal recognition in courts of law. Wildlife professionals are increasingly challenged by wildlife-human conflicts, which often are the focus of attention from the news media. Wildlife professionals should endeavor to minimize the negative and enhance the positive values of wildlife, even for those species that have become locally overabundant and are sometimes regarded as pests. TWS will continue to support wildlife damage management professionals in their efforts to objectively manage wildlife species for the benefit of society and the wildlife resource