Planting Pattern and Cultivar Effects on Flax Yields in Northwestern Iowa

In the United States, consumption of flaxseed and flaxseed oil is increasing both by direct consumption and as processed foods. Flaxseeds are high in alpha-linolenic acid, an omega-3 essential fatty acid, which is important for cardiovascular health. Whole-ground flaxseed in livestock diets can raise the level of these “healthy” fatty acids in meat and eggs. A new facility for organic flaxseed oil processing in Iowa has the potential to attract production to Iowa. Other grain buyers in the Upper Midwest are also increasing their purchase of flaxseed for animal feeds

Evaluating the adaptability of forage species and varieties

Iowa\u27s harsh climate can make forage establishment and maintenance difficult. This project examined which forages might be best adapted to growth and survival in northwest Iowa

Seeding Rate for Flax, 2005–2006

Demand for certified organic flax has increased due to a rise in human consumption of food products rich in omega-3 oil and due to the recent construction of a certified organic oilseed expelling facility in Cherokee, IA.Challenges exist to raising organic flax in the upper Midwest, including a lack of region-specific production guidelines, adequate weed management strategies, and seed availability. Contract requirements stipulate specific flax cultivars to be grown, but seed for these is not available locally. Seed shipped from Canada can be expensive,so accurate seeding rate recommendations are needed. Seeding rates may need to be increased for organic production over those suggested for conventional production to aid in weed suppression. In 2005 and 2006, ranges of seeding rates were evaluated to assess the effect on flax grain yield and oil quantity

Optimal R&D investment in the management of invasive species

Invasive alien species (IAS) threaten world biodiversity, ecosystem services, and economic welfare. While existing literature has characterized the optimal control of an established IAS, it has not considered how research and development (R&D) into new removal methods or technologies can affect management decisions and costs over time. R&D can lower the costs of control in a management plan and creates an intertemporal trade-off between quick but costly control and gradual but cheaper removal over time. In this paper, we develop and solve a continuous time dynamic optimization model to study how investment in R&D influences the optimal control of an established invasive species. After characterizing the dynamic model solution, we solve the model numerically to study the benefits from R&D in the management of the brown tree snake (Boiga irregularis), and explore how optimal solutions vary across economic and biological conditions. We find that the introduction of R&D significantly reduces overall costs of IAS and management and that the cost reductions substantially outweigh research expenditure. These results imply that policymakers seeking to control IAS should consider R&D as a vital component of cost effective control strategies

Tinkering With Testing:Understanding How Museum Program Design Advances Engineering Learning Opportunities for Children

Using a design-based research approach, we studied ways to advance opportunities for children and families to engage in engineering design practices in an informal educational setting. 213 families with 5–11-year-old children were observed as they visited a tinkering exhibit at a children’s museum during one of three iterations of a program posing an engineering design challenge. Children’s narrative reflections about their experience were recorded immediately after tinkering. Across iterations of the program, changes to the exhibit design and facilitation provided by museum staff corresponded to increased families’ engagement in key engineering practices. In the latter two cycles of the program, families engaged in the most testing, and in turn, redesigning. Further, in the latter cycles, the more children engaged in testing and retesting during tinkering, the more their narratives contained engineering-related content. The results advance understanding and the evidence base for educational practices that can promote engineering learning opportunities for children

A Systematic Review of the Efficacy of Cognitive Stimulation Therapy (CST) on Quality of Life in Persons with Dementia

Quality of life (QoL) is an established outcome measure of patients with dementia and is strongly influenced by an individual\u27s environment and mood. While there are many outcomes that can be examined with Cognitive stimulation therapy (CST) interventions, this systematic review focused on quality of life

Economics of Invasive Species Damage and Damage Management

Annually, the estimated damage caused by invasive species in the United States has exceeded $100 billion, becoming one of the leading causes of environmental change and global biodiversity loss (Wilcove et al. 1998; Mack et al. 2000; Sala et al. 2000; Pimentel et al. 2005). Invasions by nonnative species highlight the undeniable link and feedback loops between ecological and economic systems (Perrings et al. 2002; Julia et al. 2007). Ecological systems determine if the conditions are suitable for invasion by nonnative species; however, economic systems help fuel the introduction of nonnative species and are themselves affected by invasive species when the ecosystem’s ability to provide services is diminished or when livestock or crops are made unmarketable (Julia et al. 2007). Invasive species have played an important role in U.S. agriculture. While some of the goods cultivated by the U.S. agricultural sector are indigenous plant and animal species, many are introduced; a minimum of 4542 species currently existing in the United States originated from outside its borders (Office of Technology Assessment 1993). Introduced species, such as corn, wheat, rice, as well as cattle, poultry, and other livestock, are all important commodities produced by the U.S. agricultural sector. Some introduced species have potential conservation values as well, providing food and shelter for native species, acting as catalysts for restoration, serving as substitutes for extinct species, and augmenting ecosystem services (Schlaepfer et al. 2011). A distinction can be drawn, then, between introduced species and invasive species. Like introduced species, invasive species are nonnative to that ecosystem; however, invasive species have the potential to cause harm, whether measured economically, environmentally, or as a human health hazard (The White House 1999)

Program Design Considerations for Leadership Training for Dental and Dental Hygiene Students

Peer Reviewedhttps://deepblue.lib.umich.edu/bitstream/2027.42/153631/1/jddj002203372012762tb05246x.pd