GATT AND THE ENVIRONMENT: POLICY RESEARCH NEEDS

This paper is a brief review of current problems in which trade and environmental issues intersect. After a statement of these problems, it focuses on some recent empirical research and future research needs of special relevance to agricultural economists.Environmental Economics and Policy, International Relations/Trade,

Working Together more than Alone: Students\u27 Evolving Perceptions of Self and Community within a Four-Year Educational Administration Doctoral Cohort

School administrators rarely have the opportunity to confer and share their challenges with colleagues. To address this problem in 2005 the Educational Administration Department (EAD) at Central University (a Midwestern PhD granting institution located in a thriving city of about 100,00 people) created a virtual/local doctoral cohort for 14 school leaders living and working in two states. Three years into the course of study we conducted a year long inquiry that asked, How did students\u27 self-perceptions evolve within a cohort context, and how did these changes advance or retard professional learning community (PLC) growth? Our interviews had a phenomenological focus but we used symbolic interactionism to analyze them and dramaturgy to present our findings. Themes of faculty and student relationships, work and/or personal problems and dealing with technology indicated that despite some significant hurdles students\u27 identity evolutions moved the group toward becoming a PLC, a collaborative culture of thinkers

Play MNIST For Me! User Studies on the Effects of Post-Hoc, Example-Based Explanations & Error Rates on Debugging a Deep Learning, Black-Box Classifier

This paper reports two experiments (N=349) on the impact of post hoc explanations by example and error rates on peoples perceptions of a black box classifier. Both experiments show that when people are given case based explanations, from an implemented ANN CBR twin system, they perceive miss classifications to be more correct. They also show that as error rates increase above 4%, people trust the classifier less and view it as being less correct, less reasonable and less trustworthy. The implications of these results for XAI are discussed.Comment: 2 Figures, 1 Table, 8 page

Influence of Message Theme on Consumer Perceptions of Lab Grown Meat

Lab grown meat is a new technology being developed as a potential alternative protein source. Although some research has been done about public perception of lab grown meat, no studies to date have observed the effects of message themes on public perception of lab grown meat. The study sought to better understand measures of uncertainty and risk and benefit perceptions after viewing a themed blog post about lab grown meat. Participants were randomly assigned one of three themed blog posts - against lab grown meat, neutral, or support lab grown meat. Perception questions were asked after viewing the blog post, and a total of 238 responses were collected. Results indicated the message theme had a statistically significant effect on risk perception, benefit perception, and intention to consume, but not on message evaluation or measures of uncertainty. Further discussion as well as suggestions for future research are included

Status of climate change adaptation in Africa and Asia

This paper documents and analyzes the current status of adaptation initiatives in 47 vulnerable ‘hotspots’ in Asia and Africa, based on a review of grey literature, peer-reviewed articles and policy documents. Adaptations are primarily being reported from African and low-income countries, particularly those receiving adaptation funds, and primarily being driven by national governments, NGOs, and international institutions, with minimal involvement of lower levels of government or collaboration across nations. Gaps are particularly notable in North Africa and Central Asia, with limited evidence of initiatives being targeted at vulnerable populations. Agriculture is the dominant focus of reported adaptation initiatives

Habitable Climates: The Influence of Eccentricity

In the outer regions of the habitable zone, the risk of transitioning into a globally frozen "snowball" state poses a threat to the habitability of planets with the capacity to host water-based life. We use a one-dimensional energy balance climate model (EBM) to examine how obliquity, spin rate, orbital eccentricity, and ocean coverage might influence the onset of such a snowball state. For an exoplanet, these parameters may be strikingly different from the values observed for Earth. Since, for constant semimajor axis, the annual mean stellar irradiation scales with (1-e^2)^(-1/2), one might expect the greatest habitable semimajor axis (for fixed atmospheric composition) to scale as (1-e^2)^(-1/4). We find that this standard ansatz provides a reasonable lower bound on the outer boundary of the habitable zone, but the influence of obliquity and ocean fraction can be profound in the context of planets on eccentric orbits. For planets with eccentricity 0.5, our EBM suggests that the greatest habitable semimajor axis can vary by more than 0.8 AU (78%!) depending on obliquity, with higher obliquity worlds generally more stable against snowball transitions. One might also expect that the long winter at an eccentric planet's apoastron would render it more susceptible to global freezing. Our models suggest that this is not a significant risk for Earth-like planets around Sun-like stars since such planets are buffered by the thermal inertia provided by oceans covering at least 10% of their surface. Since planets on eccentric orbits spend much of their year particularly far from the star, such worlds might turn out to be especially good targets for direct observations with missions such as TPF-Darwin. Nevertheless, the extreme temperature variations achieved on highly eccentric exo-Earths raise questions about the adaptability of life to marginally or transiently habitable conditions.Comment: References added, text and figures updated, accepted by Ap

C24 Sphingolipids Govern the Transbilayer Asymmetry of Cholesterol and Lateral Organization of Model and Live-Cell Plasma Membranes

Mammalian sphingolipids, primarily with C24 or C16 acyl chains, reside in the outer leaflet of the plasma membrane. Curiously, little is known how C24 sphingolipids impact cholesterol and membrane microdomains. Here, we present evidence that C24 sphingomyelin, when placed in the outer leaflet, suppresses microdomains in giant unilamellar vesicles and also suppresses submicron domains in the plasma membrane of HeLa cells. Free energy calculations suggested that cholesterol has a preference for the inner leaflet if C24 sphingomyelin is in the outer leaflet. We indeed observe that cholesterol enriches in the inner leaflet (80%) if C24 sphingomyelin is in the outer leaflet. Similarly, cholesterol primarily resides in the cytoplasmic leaflet (80%) in the plasma membrane of human erythrocytes where C24 sphingolipids are naturally abundant in the outer leaflet. We conclude that C24 sphingomyelin uniquely interacts with cholesterol and regulates the lateral organization in asymmetric membranes, potentially by generating cholesterol asymmetry

Heat Shock Protein 70 Expression in Juvenile Eastern Oysters, Crassostrea virginica (Gmelin, 1791), Exposed to Anoxic Conditions

Anoxic water events in conjunction with summer high temperatures are thought to be one of the causes of declines in natural oyster reefs on the eastern shore of Mobile Bay. Work is underway to determine whether tolerance to low oxygen can be selected for in hatchery-produced oysters. As a component of this work, the expression of heat shock protein 70 (HSP 70) was examined in control (normoxia) and anoxia-challenged juvenile oysters. Parental Eastern oysters, Crassostrea virginica were collected from 2 sites, Cedar Point Reef (CP), an area considered to have normoxic conditions, and White House Reef (WH), an area suspected to experience periodic anoxia. F1 generation oysters were produced from CP and WH parents that survived an anoxic exposure of 96 h. Control F1 generation oysters from both parental stocks not exposed to anoxia were also produced. The F1 generation oysters were subsequently exposed to anoxia or control normoxic conditions, and differences in expression of HSP 70 were examined. Nitrogen was used to create the anoxic conditions for both the parental and F1 generations. Three HSP 70 isoforms—2 constitutive forms (HSC 77 and HSC 72) and 1 inducible form (HSP 69)—were expressed in both anoxia- and normoxia-exposed oysters from all groups. Although there were differences among groups of oysters from the 2 sites, there were no differences in the expression of HSC 77 and HSC 72 between the control and anoxia-treated oysters within a group. Interestingly, the expression of HSP 69 was higher in oysters exposed to normoxia than the ones from anoxia treatments. These differences are thought to reflect a combination of responses to nutritional stress in the controls and facultative anaerobiosis and metabolic arrest in the anoxia groups

Skin Cancer Knowledge, Attitudes, and Behaviors in Collegiate Athletes

Outdoor athletes represent an important group at risk for skin cancer because they are routinely exposed to high levels of ultraviolet radiation. The purpose of this study was to assess current skin cancer knowledge, attitudes, and behaviors among collegiate athletes. A modified version of the Melanoma Risk Behavior Survey was completed by 343 athletes attending a Southern University in the USA, generating an 87% response rate. Survey results demonstrated that the majority of the athletes do not limit their sun exposure and reported low levels of sun protective behaviors. In addition, athletes lacked knowledge about skin cancer and sun protection. Eighty-three percent of the athletes stated that tanning beds improve one's overall health. Race was significantly associated with skin cancer knowledge, whereas, gender was found to be significantly associated with knowledge, attitudes, and behaviors towards skin cancer. Additionally, there was a significant relationship between knowledge and behavior, but not between attitude and behavior. This study highlights the need to educate athletes about the hazards of tanning to minimize UV exposure and promote sun protection habits. Moreover, athletes should be educated on the dangers of indoor tanning facilities and encouraged to avoid these facilities

Preserving Engagement: Orientation amidst a Global Pandemic

When we met in November of 2019 to hold our annual orientation brainstorming session, our New Student & Family Programs (NSFP) staff dreamed of additional small groups, affinity group spaces, revamped evening programming, and increased opportunities for student connections. Four short months and many hours of planning/training later, we found ourselves in a similar brainstorming session. Except this time, it was late March, we were facing a global pandemic, and we had just shifted our orientation season completely online in response to COVID-19. Like most orientation, transition, and retention professionals around the world, we found ourselves devastated and overwhelmed. We had a very short turnaround time (18 days), but one thing was essential for us—we would preserve as much student/family engagement and interaction as possible. In this article, we explore the decision-making process, methods, action steps, and considerations for implementing a virtual orientation that embraced student and familial engagement despite the global pandemic