The effects of soil moisture, soil texture, and host orientation on the ability of Heterorhabditis bacteriophora (Rhabditida: Heterorhabditidae) to infect Galleria mellonella (Lepidoptera: Pyralidae)

Abstract Entomopathogenic nematodes (EPN) demonstrate potential as a biological control for soil dwelling insects. However, edaphic factors, such as soil moisture and texture impact the efficacy of EPN on a host. The objectives were to examine the effects of soil texture and moisture on 1) the infection rate of Galleria mellonella L. by EPN and; 2) the ability of H. bacteriophora (Poinar) to move through the soil to find a host at different orientations. Soil textures consisted of sand, a sand/silt/peat mixture, and a silt/peat mixture at 50% and 100% moisture. A general linear model was used to evaluate infection rates and EPN movement. Both soil moisture (p \u3c 0.05) and texture (p \u3c 0.05) had significant effects on nematodes infection rates of G. mellonella. Texture, moisture, and host orientation did not significantly affect (p \u3e 0.05) the ability of EPN to find a host. While EPN were able to find a host within a variety of soil types, soils that held more water had higher infection rates than soils that held less water, suggesting that moisture may be a key component in facilitating infection by EPN. By understanding the factors that influence the ability of EPN to find and infect a host, improved bio-control programs using EPN can be developed

Youth Internet Radio Network: Can we Innovate Democracy?

The Youth Internet Radio Network (YIRN) explores the connection between media technologies and citizenship, building on work by Hartley and Tacchi on 'radiocracy' (radio, democracy & development)4. YIRN combines: 1. Content creation: Establishing a network of young content providers across urban, regional, remote and Indigenous locations; 2. Ethnographic Action Research: Researching how young people interact as both producers and consumers of new media content and technology; 3. Technology Innovation: Identifying how different ‘communicative ecologies’ within the network influence and learn from each other; and, 4. Enterprise development: Understanding how culture and creativity combined with new technologies can be a seedbed for innovation and enterprise. Groups of young people across Queensland will be trained in how to produce content for a dedicated website - audio (music and speech), text (stories, reports, journals) and visuals (photographs, artworks). In addition, the network will allow groups of young people to interact with each other and with others (including Government) on topics and issues chosen by them - through forums, messaging services, message boards, blogs and emails. This research project investigates important questions about new media and participation. If the new economy is a network economy, if the new raw materials are information and knowledge, and if the new workforce needs content creation skills, how will these young people set about using and developing the YIRN network? How do creativity, access, networks and connectivity work together - what are the results of ensuring access and training at this level to a diverse and dispersed set of groups of young people? How does this network work as a communication space: how will the young people interact with each other? And how will they communicate with Government and other agencies? When they are participating in an interactive network are they simultaneously being citizens? Would enterprises built around creative content be civic institutions? This paper presents some of the challenges that face this research project as it seeks to discover how youth civic participation might be addressed through innovative Internet use by embracing practices that are often considered resistant and the domain of a 'subversive youth' (Hartley 1992, 21-42)

Evaluation of off-road terrain with static stereo and monoscopic displays

The National Aeronautics and Space Administration is currently funding research into the design of a Mars rover vehicle. This unmanned rover will be used to explore a number of scientific and geologic sites on the Martian surface. Since the rover can not be driven from Earth in real-time, due to lengthy communication time delays, a locomotion strategy that optimizes vehicle range and minimizes potential risk must be developed. In order to assess the degree of on-board artificial intelligence (AI) required for a rover to carry out its' mission, researchers conducted an experiment to define a no AI baseline. In the experiment 24 subjects, divided into stereo and monoscopic groups, were shown video snapshots of four terrain scenes. The subjects' task was to choose a suitable path for the vehicle through each of the four scenes. Paths were scored based on distance travelled and hazard avoidance. Study results are presented with respect to: (1) risk versus range; (2) stereo versus monocular video; (3) vehicle camera height; and (4) camera field-of-view

Reconstruction of drainage evolution in a Large Igneous Province : Intra-basaltic sedimentation in the Columbia River Basalt Province, Washington State, USA

Peer reviewe