Showing papers by "University of South Carolina published in 2006"

The Unhealthy = Tasty Intuition and Its Effects on Taste Inferences, Enjoyment, and Choice of Food Products

Abstract: Across four experiments, the authors find that when information pertaining to the assessment of the healthiness of food items is provided, the less healthy the item is portrayed to be, (1) the better is its inferred taste, (2) the more it is enjoyed during actual consumption, and (3) the greater is the preference for it in choice tasks when a hedonic goal is more (versus less) salient. The authors obtain these effects both among consumers who report that they believe that healthiness and tastiness are negatively correlated and, to a lesser degree, among those who do not report such a belief. The authors also provide evidence that the association between the concepts of “unhealthy” and “tasty” operates at an implicit level. The authors discuss possibilities for controlling the effect of the unhealthy = tasty intuition (and its potential for causing negative health consequences), including controlling the volume of unhealthy but tasty food eaten, changing unhealthy foods to make them less unhealthy...

Effect of Weight Loss With Lifestyle Intervention on Risk of Diabetes

Abstract: OBJECTIVE —Diabetes Prevention Program (DPP) participants randomized to the intensive lifestyle intervention (ILS) had significantly reduced risk of diabetes compared with placebo participants. We explored the contribution of changes in weight, diet, and physical activity on the risk of developing diabetes among ILS participants. RESEARCH DESIGN AND METHODS —For this study, we analyzed one arm of a randomized trial using Cox proportional hazards regression over 3.2 years of follow-up. RESULTS —A total of 1,079 participants were aged 25–84 years (mean 50.6 years, BMI 33.9 kg/m2). Weight loss was the dominant predictor of reduced diabetes incidence (hazard ratio per 5-kg weight loss 0.42 [95% CI 0.35–0.51]; P < 0.0001). For every kilogram of weight loss, there was a 16% reduction in risk, adjusted for changes in diet and activity. Lower percent of calories from fat and increased physical activity predicted weight loss. Increased physical activity was important to help sustain weight loss. Among 495 participants not meeting the weight loss goal at year 1, those who achieved the physical activity goal had 44% lower diabetes incidence. CONCLUSIONS —Interventions to reduce diabetes risk should primarily target weight reduction.

Bank Ownership and Efficiency in China: What will Happen in the World's Largest Nation?

Abstract: China's economy has been growing rapidly based on globalization of trade, but the country is only beginning to globalize its banking sector China's current banking reform includes partially privatizing three of its dominant Big Four state-owned banks and taking on minority foreign ownership of these institutions Other state-owned banks are also engaging in this practice Predicting the efficiency effects of these and other reforms is difficult because of little relevant background research evidence This paper helps to fill some of the gaps in the literature, analyzing the profit and cost efficiency of banks representing 95% of commercial banking assets in China over 1994-2003 with different majority and minority ownership structures The key findings are that the Big Four state-owned banks are by far the least efficient, and that minority foreign ownership of other banks is associated with significantly improved efficiency These and other findings suggest that minority foreign ownership of the Big Four and other reforms that allow foreign banks to play larger roles will likely improve the performance of the Chinese banking sector, with positive effects on economic growth

Complex Graphs and Networks

Abstract: Graph theory in the information age Old and new concentration inequalities A generative model--the preferential attachment scheme Duplication models for biological networks Random graphs with given expected degrees The rise of the giant component Average distance and the diameter Eigenvalues of the adjacency matrix of $G(\mathbf{w})$ The semi-circle law for $G(\mathbf{w})$ Coupling on-line and off-line analyses of random graphs The configuration model for power law graphs The small world phenomenon in hybrid graphs Bibliography Index.

Who cares about corruption

Abstract: This paper examines the impact of corruption on foreign direct investment (FDI). It argues that corruption results not only in a reduction in FDI, but also in a change in the composition of country of origin of FDI. It presents two key findings. First, corruption results in relatively lower FDI from countries that have signed the Organization for Economic Cooperation and Development Convention on Combating Bribery of Foreign Public Officials in International Business Transactions. This suggests that laws against bribery abroad may act as a deterrent against engaging in corruption in foreign countries. Second, corruption results in relatively higher FDI from countries with high levels of corruption. This suggests that investors who have been exposed to bribery at home may not be deterred by corruption abroad, but instead seek countries where corruption is prevalent.

A Single Amino Acid Mutation Contributes to Adaptive Beach Mouse Color Pattern

Abstract: Natural populations of beach mice exhibit a characteristic color pattern, relative to their mainland conspecifics, driven by natural selection for crypsis. We identified a derived, charge-changing amino acid mutation in the melanocortin-1 receptor (Mc1r) in beach mice, which decreases receptor function. In genetic crosses, allelic variation at Mc1r explains 9.8% to 36.4% of the variation in seven pigmentation traits determining color pattern. The derived Mc1r allele is present in Florida's Gulf Coast beach mice but not in Atlantic coast mice with similar light coloration, suggesting that different molecular mechanisms are responsible for convergent phenotypic evolution. Here, we link a single mutation in the coding region of a pigmentation gene to adaptive quantitative variation in the wild.

Quantitation of Metal Content in the Silver-Assisted Growth of Gold Nanorods

Abstract: The seed-mediated approach to making gold nanorods in aqueous surfactant solutions has become tremendously popular in recent years Unlike the use of strong chemical reductants to make spherical gold nanoparticles, the growth of gold nanorods requires weak reducing conditions, leading to an unknown degree of gold reduction The metal content of gold nanorods, made in high yield in the presence of silver ion, is determined by inductively coupled plasma atomic emission spectroscopy Through the use of the known gold concentration in nanorods, molar extinction coefficients are calculated for nanorods of varying aspect ratios from 20 to 45 The extinction coefficients at the longitudinal plasmon band peak maxima for these nanorods vary from 25 × 109 to 55 × 109 M-1 cm-1, respectively, on a per-particle basis Many of the gold ions present in the growth solution remain unreacted; insights into the growth mechanism of gold nanorods are discussed

Living on the Edge of Two Changing Worlds: Forecasting the Responses of Rocky Intertidal Ecosystems to Climate Change

Abstract: Long-term monitoring shows that the poleward range edges of intertidal biota have shifted by as much as 50 km per decade, faster than most recorded shifts of terrestrial species. Although most studies have concentrated on species-range edges, recent work emphasizes how modifying factors such as regional differences in the timing of low tide can overwhelm large-scale climatic gradients, leading to a mosaic of environmental stress. We discuss how changes in the mean and variability in climatic regimes, as modified by local and regional factors, can lead to complex patterns of species distribution rather than simple range shifts. We describe how ecological forecasting may be used to generate explicit hypotheses regarding the likely impacts of different climatic change scenarios on the distribution of intertidal species and how related hindcasting methods can be used to evaluate changes that have already been detected. These hypotheses can then be tested over a hierarchy of temporal and spatial scales using coupled field and laboratory-based approaches.

Validation and Calibration of an Accelerometer in Preschool Children

Abstract: Objective: Obesity rates in young children are increasing, and decreased physical activity is likely to be a major contributor to this trend. Studies of physical activity in young children are limited by the lack of valid and acceptable measures. The purpose of this study was to calibrate and validate the ActiGraph accelerometer for use with 3- to 5-year-old children. Research Methods and Procedures: Thirty preschool children wore an ActiGraph accelerometer (ActiGraph, Fort Walton Beach, FL) and a Cosmed portable metabolic system (Cosmed, Rome, Italy) during a period of rest and while performing three structured physical activities in a laboratory setting. Expired respiratory gases were collected, and oxygen consumption was measured on a breath-by-breath basis. Accelerometer data were collected at 15-second intervals. For cross-validation, the same children wore the same instruments while participating in unstructured indoor and outdoor activities for 20 minutes each at their preschool. Results: In calibrating the accelerometer, the correlation between Vo2 (ml/kg per min) and counts was r = 0.82 across all activities. The only significant variable in the prediction equation was accelerometer counts (R2 = 0.90, standard error of the estimate = 4.70). In the cross-validation, the intraclass correlation coefficient between measured and predicted Vo2 was R = 0.57 and the Spearman correlation coefficient was R = 0.66 (p < 0.001). Cut-off points for moderate- and vigorous-intensity physical activity were identified at 420 counts/15 s (Vo2 = 20 mL/kg per min) and 842 counts/15 s (Vo2 = 30 mL/kg per min), respectively. When these cutpoints were applied to the cross-validation data, percentage agreement, kappa, and modified kappa for moderate activity were 0.69, 0.36, and 0.38, respectively. For vigorous activity, the same measures were 0.81, 0.13, and 0.62. Discussion: Accelerometer counts were highly correlated with Vo2 in young children. Accelerometers can be appropriately used as a measure of physical activity in this population.

Characteristics of Adolescents Who Report Very High Life Satisfaction

Abstract: This study investigated the characteristics of adolescents who report high levels of life global satisfaction. A total of 485 adolescents completed the Students’ Life Satisfaction Scale (SLSS) (Huebner, E. S. (1991). Sch. Psychol. Int. 12: 231–240.) along with self-report measures of intrapersonal, interpersonal, and school-related functioning. Based on their SLSS scores, students were divided into three groups: “low” (bottom 20% of the distribution), “average” (middle 50%), and “high” (upper 20%). Youth in the high satisfaction group reported significantly higher adaptive functioning on all dependent variables than youth in the low satisfaction group. Relative to students with average life satisfaction, students with high life satisfaction reported superior scores on a measure of social stress, a measure of attitudes toward teachers, and on all measures of intrapersonal functioning. Also, no adolescents in the high life satisfaction group demonstrated clinical levels of psychological symptoms, whereas 7% of the average group and 42% of the low satisfaction group reported clinical levels of symptoms. Taken together, the findings suggested that high life satisfaction is associated with some mental health benefits that are not found among youth reporting comparatively lower satisfaction levels.

Concentration Inequalities and Martingale Inequalities: A Survey

Abstract: We examine a number of generalized and extended versions of concentration inequalities and martingale inequalities. These inequalities are effective for analyzing processes with quite general conditions as illustrated in an example for an infinite Polya process and web graphs.

Observation of muon neutrino disappearance with the MINOS detectors in the NuMI neutrino beam

Abstract: This letter reports results from the MINOS experiment based on its initial exposure to neutrinos from the Fermilab NuMI beam. The rate and energy spectra of charged current muon neutrino interactions are compared in two detectors located along the beam axis at distances of 1 km and 735 km. With 1.27 x 10^{20} 120 GeV protons incident on the NuMI target, 215 events with energies below 30 GeV are observed at the Far Detector, compared to an expectation of 336 \\\\\\\\\\\\\\\\pm 14.4 events. The data are consistent with muon neutrino disappearance via oscillation with |\\\\\\\\\\\\\\\\Delta m^2_{23}| = 2.74^{+0.44}_{-0.26} x 10^{-3} eV^2/c^4 and sin^2(2\\\\\\\\\\\\\\\\theta_{23}) > 0.87 (at 60% C.L.).

National culture and financial systems

Abstract: Countries differ in the way their financial activities are organized In Anglo-Saxon countries such as the US and the UK financial systems are dominated by stock markets, whereas in continental Europe and Japan banks play a predominant role Why do countries differ in the configuration of their financial systems? We argue that national culture plays a significant role We find that countries characterized by higher uncertainty avoidance are more likely to have a bank-based system

Public Parks and Physical Activity Among Adolescent Girls

Abstract: OBJECTIVES.Physical activity may be constrained or facilitated by local environments. The availability of neighborhood facilities for physical activity may be particularly relevant for youth, who are unable to drive and whose activity is often limited to the immediate distance they are able to walk or bicycle. Several studies have shown that proximity to recreational facilities and parks is one of the most important predictors of physical activity. Because the United States already has an extensive infrastructure of parks, with 70% of adults indicating that they live within walking distance of a park or playground, parks may be a potential venue for increasing physical activity. This might be particularly important for adolescent girls, whose physical activity levels decline substantially as they go through puberty. The goal of this study was to examine the association between park proximity, park type, and park features and physical activity in adolescent girls. PATIENTS AND METHODS.This was a cross-sectional study using baseline data from the Trial of Activity for Adolescent Girls. It included 1556 grade 6 girls who were randomly selected from 6 middle schools in each of the following 6 field site areas: Washington, DC, and Baltimore, Maryland; Columbia, South Carolina; Minneapolis, Minnesota; New Orleans, Louisiana; Tucson, Arizona; and San Diego, California. Girls wore accelerometers for 6 days to measure metabolic equivalent‐ weighted moderate-to-vigorous physical activity, a measure accounting for the volume and intensity of activity. Metabolic equivalent‐weighted moderate-tovigorous physical activity was calculated for the hours outside of school time using 2 different cutpoints, activity levels 3.0 metabolic equivalents and 4.6 metabolic equivalents, the latter indicating activity at the intensity of a brisk walk or higher. We mapped all of the parks within 1 mile of each girl’s home. Trained staff used a checklist to document the presence of facilities and amenities at each park, including passive amenities, such as drinking fountains, restrooms, and areas with shade, as well as active amenities like basketball courts, multipurpose fields, playgrounds, and tennis courts.

Aspect ratio dependence on surface enhanced Raman scattering using silver and gold nanorod substrates

Abstract: Silver and gold nanorods with aspect ratios from 1 to 16 have been used as substrates for surface enhanced Raman spectroscopy (SERS) in colloidal solution. The nanorod aspect ratio is varied to give different degrees of overlap between the nanorod longitudinal plasmon band and excitation source in order to determine its effect on overall surface enhancement. Results suggest that enhancement factors are a factor of 10–102 greater for substrates that have plasmon band overlap with the excitation source than for substrates whose plasmon bands do not.

Not seeing the ocean for the islands: the mediating influence of matrix-based processes on forest fragmentation effects.

Abstract: The pervasive influence of island biogeography theory on forest fragmentation research has often led to a misleading conceptualization of landscapes as areas of forest/habitat and ‘non-forest/non-habitat’ and an overriding focus on processes within forest remnants at the expense of research in the human-modified matrix. The matrix, however, may be neither uniformly unsuitable as habitat nor serve as a fully‐absorbing barrier to the dispersal of forest taxa. In this paper, we present a conceptual model that addresses how forest habitat loss and fragmentation affect biodiversity through reduction of the resource base, subdivision of populations, alterations of species interactions and disturbance regimes, modifications of microclimate and increases in the presence of invasive species and human pressures on remnants. While we acknowledge the importance of changes associated with the forest remnants themselves (e.g. decreased forest area and increased isolation of forest patches), we stress that the extent, intensity and permanence of alterations to the matrix will have an overriding influence on area and isolation effects and emphasize the potential roles of the matrix as not only a barrier but also as habitat, source and conduit. Our intention is to argue for shifting the examination of forest fragmentation effects away from a patch-based perspective focused on factors such as patch area and distance metrics to a landscape mosaic perspective that recognizes the importance of gradients in habitat conditions.

Exercise and body image: A meta-analysis

Abstract: This review applied meta-analytic procedures to integrate research findings examining the impact of exercise on body image. We performed extensive literature searching strategies and located 121 published and unpublished studies that examined the impact of exercise on body image. Primary study results were coded, and meta-analytic procedures were conducted. Studies were grouped into intervention (i.e., exercise vs nonexercise group post-exercise intervention body-image scores), single group (i.e., pre vs post exercise intervention body-image scores), and correlational (i.e., exercisers vs nonexercisers body-image scores) effect sizes. Small effect sizes (that were weighted by sample size), that were significantly different from zero, indicated that: (a) exercisers had a more positive body image than nonexercisers; (b) exercise intervention participants reported a more positive body image post intervention compared to the nonexercising control participants; and (c) exercisers had a significant improvement ...

Mosaic patterns of thermal stress in the rocky intertidal zone: implications for climate change

Abstract: We explicitly quantified spatial and temporal patterns in the body temperature of an ecologically important species of intertidal invertebrate, the mussel Mytilus californianus, along the majority of its latitudinal range from Washington to southern California, USA. Using long-term (five years), high-frequency temperature records recorded at multiple sites, we tested the hypothesis that local ''modifying factors'' such as the timing of low tide in summer can lead to large-scale geographic mosaics of body temperature. Our results show that patterns of body temperature during aerial exposure at low tide vary in physiologically meaningful and often counterintuitive ways over large sections of this species' geographic range. We evaluated the spatial correlations among sites to explore how body temperatures change along the latitudinal gradient, and these analyses show that ''hot spots'' and ''cold spots'' exist where temperatures are hotter or colder than expected based on latitude. We identified four major hot spots and four cold spots along the entire geographic gradient with at least one hot spot and one cold spot in each of the three regions examined (Washington- Oregon, Central California, and Southern California). Temporal autocorrelation analysis of year-to-year consistency and temporal predictability in the mussel body temperatures revealed that southern animals experience higher levels of predictability in thermal signals than northern animals. We also explored the role of wave splash at a subset of sites and found that, while average daily temperature extremes varied between sites with different levels of wave splash, yearly extreme temperatures were often similar, as were patterns of predictability. Our results suggest that regional patterns of tidal regime and local pattern of wave splash can overwhelm those of large-scale climate in driving patterns of body temperature, leading to complex thermal mosaics of temperature rather than simple latitudinal gradients. A narrow focus on population changes only at range margins may overlook climatically forced local extinctions and other population changes at sites well within a species range. Our results emphasize the importance of quantitatively examining biogeographic patterns in environ- mental variables at scales relevant to organisms, and in forecasting the impacts of changes in climate across species ranges.