University of South Carolina Aiken

The slow rate of the oxygen reduction reaction (ORR) in the polymer electrolyte membrane fuel cell (PEMFC) is the main limitation for automotive applications. We demonstrated that the Pt3Ni(111) surface is 10-fold more active for the ORR than the corresponding Pt(111) surface and 90-fold more active than the current state-of-the-art Pt/C catalysts for PEMFC. The Pt3Ni(111) surface has an unusual electronic structure (d-band center position) and arrangement of surface atoms in the near-surface region. Under operating conditions relevant to fuel cells, its near-surface layer exhibits a highly structured compositional oscillation in the outermost and third layers, which are Pt-rich, and in the second atomic layer, which is Ni-rich. The weak interaction between the Pt surface atoms and nonreactive oxygenated species increases the number of active sites for O2 adsorption.

Mass mortalities due to disease outbreaks have recently affected major taxa in the oceans. For closely monitored groups like corals and marine mammals, reports of the frequency of epidemics and the number of new diseases have increased recently. A dramatic global increase in the severity of coral bleaching in 1997–98 is coincident with high El Niño temperatures. Such climate-mediated, physiological stresses may compromise host resistance and increase frequency of opportunistic diseases. Where documented, new diseases typically have emerged through host or range shifts of known pathogens. Both climate and human activities may have also accelerated global transport of species, bringing together pathogens and previously unexposed host populations.

Using the methodology of Walker and Avant, the purpose of this paper was to identify the most frequently used theoretical and operational definitions of social support. A positive relationship between social support and health is generally accepted in the literature. However, the set of dimensions used to define social support is inconsistent. In addition, few measurement tools have established reliability and validity. Findings from this conceptual analysis suggested four of the most frequently used defining attributes of social support: emotional, instrumental, informational, and appraisal. Social network, social embeddedness, and social climate were identified as antecedents of social support. Social support consequences were subsumed under the general rubric of positive health states. Examples were personal competence, health maintenance behaviours, effective coping behaviours, perceived control, sense of stability, recognition of self-worth, positive affect, psychological well-being, and decreased anxiety and depression. Recommendations for future research were made.

OBJECTIVE: The authors conducted a meta-analysis of empirical studies investigating associations between indices of posttraumatic stress disorder (PTSD) and intimate relationship problems to empirically synthesize this literature. METHOD: A literature search using PsycINFO, Medline, Published International Literature on Traumatic Stress (PILOTS), and Dissertation Abstracts was performed. The authors identified 31 studies meeting inclusion criteria. RESULTS: True score correlations (ρ) revealed medium-sized associations between PTSD and intimate relationship discord (ρ = .38, N = 7,973, K = 21), intimate relationship physical aggression perpetration (ρ = .42, N = 4,630, K = 19), and intimate relationship psychological aggression perpetration (ρ = .36, N = 1,501, K = 10). The strength of the association between PTSD and relationship discord was higher in military (vs. civilian) samples, and when the study was conducted in the United States (vs. other country), and the study represented a doctoral dissertation (vs. published article). The strength of the association between PTSD and physical aggression was higher in military (vs. civilian) samples, males (vs. females), community (vs. clinical) samples, studies examining PTSD symptom severity (vs. diagnosis), when the physical aggression measure focused exclusively on severe violence (vs. a more inclusive measure), and the study was published (vs. dissertation). For the PTSD-psychological aggression association, 98% of the variance was accounted for by methodological artifacts such as sampling and measurement error; consequently, no moderators were examined in this relationship. CONCLUSIONS: Findings highlight a need for the examination of models explaining the relationship difficulties associated with PTSD symptomatology and interventions designed to treat problems in both areas.

Populations of the shallow-water Caribbean elkhorn coral, Acropora palmata, are being decimated by white pox disease, with losses of living cover in the Florida Keys typically in excess of 70%. The rate of tissue loss is rapid, averaging 2.5 cm2 x day(-1), and is greatest during periods of seasonally elevated temperature. In Florida, the spread of white pox fits the contagion model, with nearest neighbors most susceptible to infection. In this report, we identify a common fecal enterobacterium, Serratia marcescens, as the causal agent of white pox. This is the first time, to our knowledge, that a bacterial species associated with the human gut has been shown to be a marine invertebrate pathogen.

The vitality of Caribbean coral reefs has undergone a continual state of decline since the late 1970s, a period of time coincidental with large increases in transatlantic dust transport. It is proposed that the hundreds of millions of tons/year of soil dust that have been crossing the Atlantic during the last 25 years could be a significant contributor to coral reef decline and may be affecting other ecosystems. Benchmark events, such as near synchronous Caribbean‐wide mortalities of acroporid corals and the urchin Diadema in 1983, and coral bleaching beginning in 1987, correlate with the years of maximum dust flux into the Caribbean. Besides crustal elements, in particular Fe, Si, and aluminosilicate clays, the dust can serve as a substrate for numerous species of viable spores, especially the soil fungus Aspergillus . Aspergillus sydowii , the cause of an ongoing Caribbean‐wide seafan disease, has been cultured from Caribbean air samples and used to inoculate sea fans.

Abstract It has been argued that the buyer's trust of the vendor is a critical precursor to a transactional relationship in an e-commerce environment. This study uses an experimental survey to test a model that includes a number of factors such as trust mechanisms, "system trust," and vendor reputation. The results suggest that one trust mechanism, vendor guarantees, has a direct influence on system trust. Further, within e-commerce situations, system trust plays an important role in the nomological network by directly affecting trust in vendors and indirectly affecting attitudes and intentions to purchase. These results held in the case of both firms with and without an established reputation. The results demonstrate the importance of interventions such as self-reported vendor guarantees that affect system trust in enabling successful e-commerce outcomes. Keywords: e-commerceintention to purchasereputation in e-commercesystem trusttrust in vendor

The relationship between sense of community and subjective well-being (SWB) was tested by conducting telephone interviews with three random samples in South Carolina and Alabama (ns = 151, 399, and 442). Respondents answered the 17-item Sense of Community Scale (Davidson & Cotter, 1986), a measure of three facets of SWB (happiness, worrying, and personal coping), and questions about their demographic characteristics and subjective evaluations of their community. Partial correlation coefficients were computed between sense of community and SWB, partialling out the influence of demographic and community-evaluation variables. Sense of community was significantly related to SWB in all three samples. The effects were especially pronounced for the happiness facet of SWB. Implications are drawn for theory and intervention, and recommendations are made for further research.

Abstract Diseases are causing alarming declines in reef‐building coral species, the foundation blocks of coral reefs. The emergence of these diseases has occurred simultaneously with large increases in the abundance of benthic macroalgae. Here, we show that physical contact with the macroalga Halimeda opuntia can trigger a virulent disease known as white plague type II that has caused widespread mortality in most Caribbean coral species. Colonies of the dominant coral Montastraea faveolata exposed to algal transplants developed the disease whereas unexposed colonies did not. The bacterium Aurantimonas coralicida , causative agent of the disease, was present on H. opuntia sampled close to, and away from diseased corals, indicating that the alga serves as a reservoir for this pathogen. Our results suggest that the spread of macroalgae on coral reefs could account for the elevated incidence of coral diseases over past decades and that reduction of macroalgal abundance could help control coral epizootics.

Figures just released from the 2000 U.S. Census reveal what demographers have predicted for the past decade: Latinos are surpassing African Americans as the country’s largest minority group. Yet because of differences in national origin, physical appearance, historical memory, class, and religion, no single group identity exists for this rapidly growing population. In part because of this diversity, in the 2000 Census, respondents, for the first time, could select more than one racial category. Clara Rodríguez’s newest work on Latinos in the U.S. examines difficulties in categorizing this group as part of a broader discussion of ethnicity and race in the United States. She chose as her lens the U.S. Census Bureau because census categories and definitions reveal a society’s “dominant ideals and beliefs” (p. xiv) and such definitions shape how peoples and individuals see themselves and others. Rodríguez’s aim is to demonstrate through the Latino experience that race is not fixed; it is “imperfectly measured” and can lead to discrimination and misunderstanding. A sociologist by training, Rodríguez draws upon her own experiences as a Latina, on interviews, analyses of census data, and secondary works from a variety of disciplines.The difficulty in classifying Latinos underscores one of Rodríguez’s main points: definitions of race and ethnicity are subjective and dependent on context. Some public agencies consider Latinos a race, but the Bureau of the Census does not (a topic to which the author devotes ample space). Rodríguez argues that most in the U.S. conflate race and ethnicity, and see race as genetically determined and fixed (as evidenced by Census Bureau efforts to make Latinos and other groups fit the bipolar racial categories of white and non-white). Meanwhile, for Latinos, race and ethnicity are culturally determined, fluid, and contextual. As Rodríguez explains, these divergent notions of race and ethnicity came out of our respective historical experiences.Rodríguez describes the evolution of the U.S.’s bipolar racial paradigm by tracing the Census Bureau’s two-hundred-year history of shifting categories and criteria. She ably links changing racial definitions over time to broader social and political factors, and sees the Bureau’s recent efforts to more accurately categorize Hispanics as evidence that notions of race and ethnicity are undergoing further adjustment in this country.This broad treatment of Latino identity and U.S. efforts to categorize its diverse populations will complement the plethora of new works on the Latino experience in the U.S. It should prove useful also to historians of race and ethnicity in America. While Rodríguez’s arguments are somewhat disorganized and repetitive, the redundancy permits the use of individual chapters for teaching purposes. Further, although little new scholarship appears here, the author provides a relatively thorough review of the literature on issues such as Latino identity formation and acculturation. In addition, Rodríguez’s history of Census activities is also quite thorough, and the book is richly documented. Those seeking more on the historical development of notions of race and ethnicity in Latin America will no doubt be disappointed, however, given the outdated and limited resources consulted. Perhaps the real value of this work is the perspective it offers on how Latinos in this country have been perceived and how they perceive themselves. It is likely that this population group will prove quite instrumental in reshaping our ideas of race and ethnicity.

Recent findings on the ecology, etiology and pathology of coral pathogens, host resistance mechanisms, previously unknown disease/syndromes and the global nature of coral reef diseases have increased our concern about the health and future of coral reef communities. Much of what has been discovered in the past 4 years is presented in this special issue. Among the significant findings, the role that various Vibrio species play in coral disease and health, the composition of the 'normal microbiota' of corals, and the possible role of viruses in the disease process are important additions to our knowledge. New information concerning disease resistance and vectors, variation in pathogen composition for both fungal diseases of gorgonians and black band disease across oceans, environmental effects on disease susceptibility and resistance, and temporal and spatial disease variations among different coral species is presented in a number of papers. While the Caribbean may still be the 'disease hot spot' for coral reefs, it is now clear that diseases of coral reef organisms have become a global threat to coral reefs and a major cause of reef deterioration.

Purpose Using the resource-based and the resource dependence theoretical approaches of the firm, the paper explores firm responses to supply chain disruptions during COVID-19. The paper explores how firms develop localization, agility and digitization (L-A-D) capabilities by applying (or not applying) their critical circular economy (CE) and blockchain technology (BCT)-related resources and capabilities that they either already possess or acquire from external agents. Design/methodology/approach An abductive approach, applying exploratory qualitative research was conducted over a sample of 24 firms. The sample represented different industries to study their critical BCT and CE resources and capabilities and the L-A-D capabilities. Firm resources and capabilities were classified using the technology, organization and environment (TOE) framework. Findings Findings show significant patterns on adoption levels of the blockchain-enabled circular economy system (BCES) and L-A-D capability development. The greater the BCES adoption capabilities, the greater the L-A-D capabilities. Organizational size and industry both influence the relationship between BCES and L-A-D. Accordingly, research propositions and a research framework are proposed. Research limitations/implications Given the limited sample size, the generalizability of the findings is limited. Our findings extend supply chain resiliency research. A series of propositions provide opportunities for future research. The resource-based view and resource-dependency theories are useful frameworks to better understanding the relationship between firm resources and supply chain resilience. Practical implications The results and discussion of this study serve as useful guidance for practitioners to create CE and BCT resources and capabilities for improving supply chain resiliency. Social implications The study shows the socio-economic and socio-environmental importance of BCES in the COVID-19 or similar crises. Originality/value The study is one of the initial attempts that highlights the possibilities of BCES across multiple industries and their value during pandemics and disruptions.

A bacterium previously isolated from a diseased colony of the scleractinian coral Dichocoenia stokesi (common name elliptical star coral) was subjected to a detailed polyphasic taxonomic characterization. The isolate, designated WP1T, was halophilic and strictly aerobic and formed golden-orange-pigmented colonies after prolonged incubation. Cells of WP1T were gram-negative, rod-shaped and showed a characteristic branching rod morphology. Chemotaxonomically, WP1T was characterized by having Q-10 as the major respiratory lipoquinone and sym-homospermidine as the main component of the cellular polyamine content. The predominant constituent in the cellular fatty acid profile was C18:1 omega7c, along with C19:0 cyclo omega8c and C16:0. Other fatty acids present in smaller amounts were C17:0, C18:0, C16:1 omega7c, C20:1 omega7c and C18:1 2-OH. The major polar lipids were phosphatidylethanolamine, phosphatidylglycerol and phosphatidylcholine. Minor amounts of diphosphatidylglycerol, phosphatidylmonomethylethanolamine and phosphatidyldimethylethanolamine were present. The G + C content of the genomic DNA was 66.3 mol%. Phylogenetic analysis of the 16S rRNA gene sequence showed that WP1T represents a separate subline of descent within the order 'Rhizobiales' of the 'Alphaproteobacteria'. The new line of descent falls within the group of families that includes the Rhizobiaceae, Bartonellaceae, Brucellaceae and 'Phyllobacteriaceae', with no particular relative within this group. The 16S rRNA gene sequence similarity to all established taxa within this group was not higher than 92.0% (to Mesorhizobium mediterraneum). To accommodate this emerging coral pathogen, the creation of a new genus and species is proposed, Aurantimonas coralicida gen. nov., sp. nov. (type strain WP1T = CIP 107386T = DSM 14790T).

The stigma experienced by women with HIV/AIDS is much like that of Hester Prynne in The Scarlet Letter. At the time of diagnosis with HIV/AIDS, women already are aware of the stigma associated with the disease. They immediately see themselves differently and believe others do also. The purpose of this article is to explore the multidimensional effect of stigma on women's efforts to promote, maintain, and enhance their health. The experiences of the women in this study tell of rejection by family members, friends, health care providers, employers, and church members. This rejection caused by stigma affects access to health care, medication adherence, social interaction, and social support. Interventions are needed to decrease the impact of stigma on women with HIV/AIDS so they can achieve a higher level of wellness, increase their life span, continue in the workforce, and improve their quality of life.

The goal of this investigation was to examine gender differences in experiences of sexual harassment during military service and the negative mental health symptoms associated with these experiences. Female (n = 2,319) and male (n = 1,627) former reservists were surveyed about sexual harassment during their military service and current mental health symptoms. As expected, women reported a higher frequency of sexual harassment. Further, women had increased odds of experiencing all subtypes of sexual harassment. Being female conferred the greatest risk for experiencing the most serious forms of harassment. For both men and women, sexual harassment was associated with more negative current mental health. However, at higher levels of harassment, associations with some negative mental health symptoms were stronger for men than women. Although preliminary, the results of this investigation suggest that although women are harassed more frequently than men, clinicians must increase their awareness of the potential for sexual harassment among men in order to provide the best possible care to all victims of harassment.

Based on a deductive process, several objective items were developed to measure people's sense of community with their city of residence. An item analysis produced a 17‐item scale, which was then evaluated for homogeneity and external validity in three studies using telephone interviews on random samples in Alabama and South Carolina. Of seven hypotheses that were tested, six received support. Results described the scale as internally reliable and unidimensional, and the scale differentiated between people who differed in terms of demographics, home ownership, and civic contributions. Contrary to prediction, the scale did not relate to how long people had lived in their city. Explanations for this were offered and then conclusions were drawn about the potential usefulness of the scale.

The bacterial and temperature factors leading to yellow blotch/band disease (YBD), which affects the major reef-building Caribbean corals Montastrea spp., have been investigated. Groups of bacteria isolated from affected corals and inoculated onto healthy corals caused disease signs similar to those of YBD. The 16S rRNA genes from these bacteria were sequenced and found to correspond to four Vibrio spp. Elevating the water temperature notably increased the rate of spread of YBD on inoculated corals and induced greater coral mortality. YBD-infected corals held at elevated water temperatures had 50% lower zooxanthella densities, 80% lower division rates, and a 75% decrease in chlorophyll a and c2 pigments compared with controls. Histological sections indicated that the algal pyrenoid was fragmented into separate segments, along with a reconfiguration and swelling of the zooxanthellae, as well as vacuolization. YBD does not appear to produce the same physiological response formerly observed in corals undergoing temperature-related bleaching. Evidence indicates that YBD affects primarily the symbiotic algae rather than coral tissue.

BACKGROUND: Long-term pedometer monitoring has not been attempted. PURPOSE: The purpose of this project was to collect 365 days of continuous self-monitored pedometer data to explore the natural variability of physical activity. METHODS: Twenty-three participants (7 men, 16 women; M age = 38 +- 9.9 years; M body mass index = 27.7 +- 6.2 kg/m2) were recruited by word of mouth at two southern U.S. universities. Participants were asked to wear pedometers at their waist during waking hours and record steps per day and daily behaviors (e.g., sport/exercise, work or not) on a simple calendar. In total, participants wore pedometers and recorded 8,197 person-days of data (of a possible 8,395 person-days, or 98%) for a mean of 10,090 +- 3,389 steps/day. Missing values were estimated using the Missing Values Analysis EM function in SPSS, Version 11.0.1. RESULTS: A mean of 10,082 +- 3,319 steps/day was computed. Using the corrected data, differences in steps/day were significant for season (summer > winter, F = 7.57, p = .001), day of the week (weekday > weekend, F = 3.97, p = .011), type of day (workday vs. nonworkday, F = 9.467, p = .008), and participation in sport/exercise (day with sport/exercise > day without sport/exercise, F = 102.5, p < .0001). CONCLUSIONS: These data suggest that surveillance should be conducted in the spring/fall or that an appropriate correction factor should be considered if the intent is to capture values resembling the year-round average.

AIMS: To determine the relationship between yellow band disease (YBD)-associated pathogenic bacteria found in both Caribbean and Indo-Pacific reefs, and the virulence of these pathogens. YBD is one of the most significant coral diseases of the tropics. MATERIALS AND RESULTS: The consortium of four Vibrio species was isolated from YBD tissue on Indo-Pacific corals: Vibrio rotiferianus, Vibrio harveyi, Vibrio alginolyticus and Vibrio proteolyticus. This consortium affects Symbiodinium (zooxanthellae) in hospite causing symbiotic algal cell dysfunction and disorganization of algal thylakoid membrane-bound compartment from corals in both field and laboratory. Infected corals have decreased zooxanthella cell division compared with the healthy corals. Vibrios isolated from diseased Diploastrea heliopora, Fungia spp. and Herpolitha spp. of reef-building corals display pale yellow lesions, which are similar to those found on Caribbean Montastraea spp. with YBD. CONCLUSIONS: The Vibrio consortium found in YBD-infected corals in the Caribbean are close genetic relatives to those in the Indo-Pacific. The consortium directly attacks Symbiodinium spp. (zooxanthellae) within gastrodermal tissues, causing degenerated and deformed organelles, and depleted photosynthetic pigments in vitro and in situ. infected fungia spp. have decreased cell division compared with the healthy zooxanthellae: 4.9%vs 1.9%, (p > or = 0.0024), and in d. heliopora from 4.7% to 0.7% (P > or = 0.002). SIGNIFICANCE AND IMPACT OF THE STUDY: Pathogen virulence has major impacts on the survival of these important reef-building corals around the tropics.

This yearlong study was implemented in seventh-grade life science classes with the students' regular teacher serving as teacher/researcher. In the study, a method of scoring concept maps was developed to assess knowledge and comprehension levels of science achievement. By linking scoring of concept maps to instructional objectives, scores were based upon the correctness of propositions. High correlations between the concept map scores and unit multiple choice tests provided strong evidence of the content validity of the map scores. Similarly, correlations between map scores and state criterion-referenced and national norm-referenced standardized tests were indicators of high concurrent validity. The approach to concept map scoring in the study represents a distinct departure from traditional methods that focus on characteristics such as hierarchy and branching. A large body of research has demonstrated the utility of such methods in the assessment of higher-level learning outcomes. The results of the study suggest that a concept map might be used in assessing declarative and procedural knowledge, both of which have a place in the science classroom. One important implication of these results is that science curriculum and its corresponding assessment need not be dichotomized into knowledge/comprehension versus higher-order outcomes. © 1998 John Wiley & Sons, Inc. J Res Sci Teach 35: 1103–1127, 1998.