Kinematics of the Outer Stellar Halo

We have tested whether the simple model for the kinematics of the Galactic stellar halo (in particular the outer halo) proposed by Sommer-Larsen, Flynn and Christensen (SLFC) is physically realizable, by directly integrating particles in a 3-D model of the Galactic potential. We are able to show that the SLFC solution can be realized in terms of a distribution of particles with stationary statistical properties in phase-space. Hence, the SLFC model, which shows a notable change in the anisotropy from markedly radial at the sun to markedly tangential beyond about Galactocentric radius r=20 kpc, seems a tenable description of outer halo kinematics.Comment: 13 pages, 6 figures, accepted for publication in MNRAS. also available at http://astro.utu.fi/~cflynn/papers/fslc4/fslc4.htm

Biological Control of Alfalfa Insect Pests

Alfalfa is a succulent plant that obviously is good feed for large herbivores such as cattle and horses. Therefore, it should not be surprising that a large number of small herbivores such as insects also find this plant delicious. Fortunately, most of these insects are not major pests. However, we do have a couple pest insects that annually attack this valuable crop and often cause economic damage. Controlling insect pests is expensive and time consuming. However, not controlling them can be disastrous to the profit margin of the alfalfa producer. Entomologists who work on the insect pests of alfalfa have been constantly on the alert for more effective natural control measures

Kentucky\u27s IPM Program for Alfalfa

Integrated Pest Management (IPM) is a concept that encourages the use of a variety of strategies in the management of crop pests. It is very important to have an indepth understanding of the crop production system when implementing an IPM program. An IPM program is dynamic requiring a continual evaluation of the status of the crop, the associated pest complex, the effects of the pests and the biological deterrents to those pests. If a pest population gets out of hand and begins to cause economic damage, pest management techniques may need to be applied. These pest management measures may be biological, mechanical, chemical or cultural or combinations of these types of controls

Reflections on the Struggle Against the Canada-US Free Trade Agreement (TFA), 30 Years Later

The implementation of the Canada-US Free Trade Agreement (CUSFTA) in January 1989 marked a decisive moment in the rise of neoliberalism as a political project in Canada. While the left, and socialist political economists in particular, played a central role in galvanizing opposition to the agreement and contributed in no small part to the demise of the Conservative government in 1993, the free trade agenda continued to move forward through the 1990s. This Special Issue revisits the history of struggles against free trade in Canada with two aims in mind: first to remember the coalitions through which opposition was organized, the mobilization of socialist critiques by activists and intellectuals, and the key events leading up to the adoption of the agreement. Second, drawing from this history to make sense of how things have changed over the past 30 years, as right-wing nationalists have increasingly taken the lead in opposing free trade, while neoliberals have sought to rebrand their project as ‘progressive’.  How can those on the left effectively confront the project of free trade today while at the same time challenging both far-right nationalism and neoliberal globalization

Cervical screening in Australia 2002–2003

The report presents most recent information on participation in cervical screening, rate of early re-screening, low-grade and high-grade abnormalities detected, incidence of cervical cancer and mortality. Analyses of incidence and mortality data by location (major cities, regional and remote) as well as mortality by Indigenous status are also presented. Where possible, data are presented by state and territory stratification

Cervical screening in Australia 2001–2002

This report is the sixth national report on the performance of the National Cervical Screening Program in Australia. Cervical screening services are provided as part of mainstream health services with general practitioners performing approximately 80% of Pap smears. The program is funded by the Australian Government, and the state and territory governments. This report presents statistics on the performance monitoring indicators agreed to by the National Advisory Committee to the program

An assessment of chemical contaminants in the marine sediments of southwest Puerto Rico

This report summarizes the results of a characterization of chemical contaminants in the sediments in southwest Puerto Rico. The report is part of a project to integrate various analytical specialties to assess linkages between chemical contaminants and the condition of coral reefs. In this phase of the project, over 120 chemical contaminants were analyzed in sediments collected, including a number of organic (e.g., hydrocarbons), inorganic (e.g., metals), and biological (bacterial) compounds/analytes. The report also provides a preliminary analysis of the association between sediment contaminants and coral species richness. Overall, the levels of chemical contaminants in the study area between Guanica Bay and the town of La Parguera were fairly low. At most of the sites sampled, particularly adjacent to the town of La Parguera, concentrations of organic and inorganic contaminants were below the median values from NOAA’s National Status and Trends Program, which monitors the Nation’s coastal and estuarine waters for chemical contaminants. Elevated levels of a number of contaminant classes were seen at the two sites sampled within Guanica Bay. An initial analysis of modeled PAH (hydrocarbon) data and coral species richness (reef building species) indicated a strong negative correlation between the presence of PAHs in the sediments and coral species richness. Additional work is needed to assess possible reasons for this observed pattern. (PDF contains 126 pages)

Investigating oxygen transport efficiencies in precision-cut liver slice-based organ-on-a-chip devices

Microfluidic ‘organ-on-a-chip’ devices hold great potential for better mimicking the continuous flow microenvironment experienced by tissue and cells in vivo, thereby ensuring realistic transport of nutrients and elimination of waste products. However, the mass transport of oxygen, which arguably is the most critical nutrient due to its inherently low solubility in water, is rarely assessed. To this aim, the suitability of various precision-cut liver slice (PCLS) microfluidic devices for the defined maintenance of oxygen mass transport were evaluated using COMSOL simulations, leading to the development of a novel, optimised design to provide defined in vivo oxygenation conditions within an organ-on-a-chip system. Simulations found that the proposed device was capable of maintaining 43% of the tissue slice volume within the physiological range of the liver against 18% for the best performing literature device. The optimal device architecture derived from the modelling was then fabricated and its operation confirmed with an LDH assay. These simulation results form the basis for a greater understanding of not just the challenges involved in designing organ-on-a-chip devices, but also highlight issues that would arise from the incorporation of additional organs, as research progresses towards complete human-on-a-chip model systems