Testing the Alchian-Allen Theorem: A Study of Consumer Behavior in the Gasoline Market

This paper uses a data set of daily sales at a single gasoline station over a seven year period to determine if consumers respond to relative price changes among the three grades of gasoline. Based on the reasoning of Alchian and Allen (1964) and Barzel (1976), market shares of higher quality gasoline should increase at the expense of regular grade gasoline when overall gasoline prices increase. The empirical results do not conform to this expectation. We find instead that the consumers in this sample responded to higher gasoline prices by switching to mid grade gasoline from premium grade gasoline leaving the market share of regular gasoline unchanged.Alchian-Allen Theorem

An analysis of the factors inhibiting ECDIS from effectually achieving its intended primary function of contributing to safe navigation

This research is contextualised in the maritime domain, where since the introduction of legislation mandating the carriage of Electronic Chart Display and Information Systems (ECDIS) by merchant vessels, evidence has emerged of unintended consequences of this legislation – which threaten the safety of navigation. The real-time presentation of information displayed by ECDIS should improve deck officers’ cognitive assessment of their navigational situation, yet the terms ‘ECDIS-assisted accidents’ and ‘ECDIS-assisted groundings’ have of late become part of maritime terminology. This dissertation presents an analysis of the factors inhibiting ECDIS from effectually achieving its intended primary function of contributing to safe navigation. Applicable legislation is identified and case studies are used to scrutinise the efficacy of the current legal framework regulating the use of ECDIS. The potentially unsafe technical operational aspects and limitations of ECDIS are analysed and the human factor and human error in the use of ECDIS are critically evaluated. Current industry initiatives to improve the safety of navigation with ECDIS are outlined and additional measures to mitigate unsafe practices in the use of ECDIS by deck officers are considered. This research finds that despite an apparently robust legal framework regulating the use of ECDIS, the current legislative provisions do not appear to be effective in preventing ECDIS-assisted accidents, particularly vessel groundings. It is found that ECDIS training has not been sufficiently integrated into the STCW Code and express provisions mandating how ECDIS should be used as an aid to navigation are inadequate. Overreliance is identified as a primary risk in the use of ECDIS, as it significantly reduces navigational safety. ECDIS is an aid to navigation and must be used in conjunction with traditional watchkeeping skills and the practices of good seamanship. Given that most maritime casualties are caused by human error, measures to address the human factor should be embedded into ECDIS pedagogy. Instead of fulfilling its primary function of improving the safety of navigation, the use of ECDIS can in fact reduce situational awareness by distracting navigators from looking out of the bridge windows. This research concludes that in the case of ECDIS, the introduction of technology intended to reduce human error in shipboard operations has inadvertently created new error sources. Improved training methods are required to address these types of technologically-generated error pathways

Commodification of the Information Profession: A Critique of Higher Education Under Neoliberalism

The structures that govern society’s understanding of information have been reorganised under a neoliberal worldview to allow information to appear and function as a commodity. This has implications for the professional ethics of library and information labour, and the need for critical reflexivity in library and information praxes is not being met. A lack of theoretical understanding of these issues means that the political interests governing decision-making are going unchallenged, for example the UK government’s specific framing of open access to research. We argue that building stronger, community oriented praxes of critical depth can serve as a resilient challenge to the neoliberal politics of the current higher education system in the UK and beyond. Critical information literacy offers a proactive, reflexive and hopeful strategy to challenge hegemonic assumptions about information as a commodity

Scarce Water in Site: A Content Analysis of News Coverage of the Sites Reservoir Project

Plagued by recent and historic drought, the need for water storage and management solutions in California is apparent. As a potential solution, the Sites Reservoir project offers an opportunity to a state eager to conserve and better manage water. The Sites Reservoir project involves complexities from a variety of standpoints and stakeholder perspectives. This study investigated the frames and sources used by The Sacramento Bee to communicate about the Sites Reservoir project over a 10-year period. The most frequently used frames throughout the dataset were “policy and government” and “water conscious,” and the sources most frequently utilized for information about the project in the articles were elected officials, government agency representatives, and nonprofit representatives. The findings suggest water management is linked with political activities and supports the assertion that the media tend to focus on the role of policy and political opinion in water management issues. At the same time, the findings suggest the need for water solutions is evident, given the prominence of the “water conscious” frame. Future studies should evaluate frames over time, and investigate the potential nuance between frames used to communicate about water management in different areas of the United States facing water management issues

Do touch that dial: A guide to continuous response measurement in agricultural communications

As the gap in agricultural experiences between farmers and consumers grow, it is important for agricultural communicators to communicate strategically with their audiences and be proactive in addressing consumers’ concerns. Communication media can present a variety of messages or pieces of information that represent multiple perspectives within one unit. The dynamic nature of communication media, such as video and audio messages, lead to the fluctuation of feelings and responses to different elements within one singular message. While agricultural communications has traditionally relied upon quantitative and qualitative survey data, there are likely gaps in complete understandings of individual perceptions in response to varying elements of the communications message. Continuous response measurement (CRM) is a method that can be used to monitor and track individual responses to media messages in real-time to reveal critical moments within a communications message. CRM holds the potential to help those in agricultural communications understand what specific elements within messages resonate most with consumers. This professional paper explores how researchers can use CRM, showcases benefits and drawbacks of CRM, and provides recommendations for contributions to agricultural communications literature

Bacteria in Salt Pans Along the Mississippi Gulf Coast

Salt pans form in shallow depressions in the ground where salt water evaporates leaving a hypersaline environment remaining. These pans become flooded during extremely high tides and as time progresses, this additional salt water is evaporated leaving behind more salt deposits. Marine salt pans can provide habitat for halophilic microorganisms and provide an interesting environment for study as conditions can change with both sediment and water depth. Towards the surface of sediment in salt pans, oxygen is still available, however, deeper sediments have limited oxygen availability and are likely anaerobic. Deeper sediments can also have higher salt concentrations so may provide an optimal environment for anaerobic halophiles. Samples were taken in July and October 2018, when the salt pans were dry and flooded, and from the surface and 30cm deep in the sediment. DNA was extracted and the V4 region of the 16S rRNA gene sequenced to determine the bacterial microbiome. Bacterial communities were compared between the surface and deeper samples and flooded and dry samples. Samples taken from surface sediments had more bacterial sequences than those taken from deeper into the sediment, and surface samples accounted for 73% of the 105,000 sequences in the dataset. Salt pan bacterial communities were primarily composed of members of the Proteobacteria, Bacteroidetes, Cyanobacteria, and Planctomycetes, although a total of 21 distinct bacterial phyla were detected. These phyla differed in their distributions, with members of the Bacteroidetes, Cyanobacteria, Planctomycetes, and Chloroflexi being mainly associated with surface sediment, and Proteobacteria being more prevalent in deeper sediment. Proteobacteria, Bacteroidetes, Cyanobacteria, and Planctomycetes accounted for a greater proportion of the dry (July) bacterial community, whereas members of the Actinobacteria were more prevalent in the flooded (October) samples. In conclusion, salt pans along the Mississippi Gulf Coast harbor a diverse bacterial community that differs both spatially (by depth) and temporally (by season and/or flooded versus dry conditions). These environments can become hypersaline when dry, suggesting that this diverse community is adapted to both flooding and high salinity conditions

Coping Strategies among Caregivers of Children with Autism Spectrum Disorders: A Cluster Analysis

Introduction/Background: The variability in coping strategies among caregivers of children with ASD may contribute to broader health outcomes; however, it is unclear if specific coping strategies are related to overall strain in this population. Therefore, this study identified groups of caregivers based on coping mechanisms and investigated differences in strain among groups. Materials & Methods: This study utilized a secondary data analysis, and included survey responses of 273 caregivers of children with ASD. Measures consisted of the COPE Inventory, and the Caregiver Strain Questionnaire. Data analyses consisted of cluster analysis to group caregiver coping strategies, and Analysis of Variance to compare the caregiver coping groups on strain level. Results: There were four distinct groups of caregivers of children with ASD with different coping styles: Social-Supported/ Planning, Spontaneous/ Reactive, Self-Supporting/ Reappraisal, and Religious/ Expressive. Caregivers in the Social-Supported/ Planning group demonstrated significantly higher levels than the remaining three groups in the use of the following coping strategies: planning, use of instrumental social support, and use of emotional social support, relative to the other three groups. Caregivers in group the Spontaneous/ Reactive group used less restraint and less suppression of competing activities relative to the other three groups. Caregivers in the Self-Supporting/ Reappraisal showed more acceptance, and positive reinterpretation and growth coping strategies. Caregivers in the Religious/ Expressive group demonstrated significantly higher levels of religious coping relative to the other three groups and utilized more venting of emotions strategies. Groups did not differ on strain level. Conclusion: This study showed that caregivers of children with ASD may utilize differential combinations of coping strategies. Future research should investigate differences between groups of caregivers based subjective strain

The saltpan microbiome is structured by sediment depth and minimally influenced by variable hydration

© 2020 by the authors. Licensee MDPI, Basel, Switzerland. Saltpans are a class of ephemeral wetland characterized by alternating periods of inundation, rising salinity, and desiccation. We obtained soil cores from a saltpan on the Mississippi Gulf coast in both the inundated and desiccated state. The microbiomes of surface and 30 cm deep sediment were determined using Illumina sequencing of the V4 region of the 16S rRNA gene. Bacterial and archaeal community composition differed significantly between sediment depths but did not differ between inundated and desiccated states. Well-represented taxa included marine microorganisms as well as multiple halophiles, both observed in greater proportions in surface sediment. Functional inference of metagenomic data showed that saltpan sediments in the inundated state had greater potential for microbial activity and that several energetic and degradation pathways were more prevalent in saltpan sediment than in nearby tidal marsh sediment. Microbial communities within saltpan sediments differed in composition from those in adjacent freshwater and brackish marshes. These findings indicate that the bacterial and archaeal microbiomes of saltpans are highly stratified by sediment depth and are only minimally influenced by changes in hydration. The surface sediment community is likely isolated from the shallow subsurface community by compaction, with the microbial community dominated by marine and terrestrial halophiles

Multigene manipulation of photosynthetic carbon assimilation increases CO2 fixation and biomass yield in tobacco

Over the next 40 years it has been estimated that a 50% increase in the yield of grain crops such as wheat and rice will be required to meet the food and fuel demands of the increasing world population. Transgenic tobacco plants have been generated with altered combinations of sedoheptulose-1,7-bisphosphatase, fructose-1,6-bisphosphate aldolase, and the cyanobacterial putative-inorganic carbon transporter B, ictB, of which have all been identified as targets to improve photosynthesis based on empirical studies. It is shown here that increasing the levels of the three proteins individually significantly increases the rate of photosynthetic carbon assimilation, leaf area, and biomass yield. Furthermore, the daily integrated measurements of photosynthesis showed that mature plants fixed between 12-19% more CO2 than the equivalent wild-type plants. Further enhancement of photosynthesis and yield was observed when sedoheptulose-1,7-bisphosphatase, fructose-1,6-bisphosphate aldolase, and ictB were over-expressed together in the same plant. These results demonstrate the potential for the manipulation of photosynthesis, using multigene-stacking approaches, to increase crop yields