bluuebunny/crossref_metadata_2025_split huggingface dataset:
Parenting practices and the development of adolescents’ social trust
Authors: Wray‐Lake Laura , Flanagan Constance A. 
Published: October 2011

ABSTRACTSocial trust (ST) (i.e., beliefs that people are generally fair and trustworthy) is a critical disposition for democratic governance. Yet there has been scant research on its developmental foundations. We assess factors related to ST in 11–18 year olds with survey data collected over two years from 1150 U.S. adolescents and their mothers. Adolescents’ ST in year 1 and their reports of a positive neighborhood climate predicted ST one year later. Adolescents’ reports of family practices were stronger predictors of their ST than were mothers’ reports. Regression analyses revealed different factors predicting changes in ST for three adolescent age groups: With ST at T1 and background factors controlled, democratic parenting boosted ST for early‐ and middle‐adolescents. Adolescents’ reports that parents encouraged compassion for others boosted ST for middle‐ and late‐adolescents, and parental cautions about other people taking advantage diminished ST among middle adolescents. Results suggest that the disposition to trust others is formed, in part, by what adolescents hear from parents about their responsibilities to fellow human beings and by modeling of democratic parenting.
Inhibitory effect of Survivin promoter‐regulated oncolytic adenovirus carrying P53 gene against gallbladder cancer
Authors: Liu Chen , Sun Bin , An Ni , Tan Weifeng , Cao Lu , Luo Xiangji , Yu Yong , Feng Feiling , Li Bin , Wu Mengchao , Su Changqing , Jiang Xiaoqing 
Published: October 2011

Gene therapy has become an important strategy for treatment of malignancies, but problems remains concerning the low gene transferring efficiency, poor transgene expression and limited targeting specific tumors, which have greatly hampered the clinical application of tumor gene therapy. Gallbladder cancer is characterized by rapid progress, poor prognosis, and aberrantly high expression of Survivin. In the present study, we used a human tumor‐specific Survivin promoter‐regulated oncolytic adenovirus vector carrying P53 gene, whose anti‐cancer effect has been widely confirmed, to construct a wide spectrum, specific, safe, effective gene‐viral therapy system, AdSurp‐P53. Examining expression of enhanced green fluorecent protein (EGFP), E1A and the target gene P53 in the oncolytic adenovirus system validated that Survivin promoter‐regulated oncolytic adenovirus had high proliferation activity and high P53 expression in Survivin‐positive gallbladder cancer cells. Our in vitro cytotoxicity experiment demonstrated that AdSurp‐P53 possessed a stronger cytotoxic effect against gallbladder cancer cells and hepatic cancer cells. The survival rate of EH‐GB1 cells was lower than 40% after infection of AdSurp‐P53 at multiplicity of infection (MOI) = 1 pfu/cell, while the rate was higher than 90% after infection of Ad‐P53 at the same MOI, demonstrating that AdSurp‐P53 has a potent cytotoxicity against EH‐GB1 cells. The tumor growth was greatly inhibited in nude mice bearing EH‐GB1 xenografts when the total dose of AdSurp‐P53 was 1 × 109 pfu, and terminal dUTP nick end‐labeling (TUNEL) revealed that the apoptotic rate of cancer cells was (33.4 ± 8.4)%. This oncolytic adenovirus system overcomes the long‐standing shortcomings of gene therapy: poor transgene expression and targeting of only specific tumors, with its therapeutic effect better than the traditional Ad‐P53 therapy regimen already on market; our system might be used for patients with advanced gallbladder cancer and other cancers, who are not sensitive to chemotherapy, radiotherapy, or who lost their chance for surgical treatment.
Microfluidic propulsion by the metachronal beating of magnetic artificial cilia: a numerical analysis
Authors: Khaderi S. N. , den Toonder J. M. J. , Onck P. R. 
Published: October 2011

AbstractIn this work we study the effect of metachronal waves on the flow created by magnetically driven plate-like artificial cilia in microchannels using numerical simulations. The simulations are performed using a coupled magneto-mechanical solid–fluid computational model that captures the physical interactions between the fluid flow, ciliary deformation and applied magnetic field. When a rotating magnetic field is applied to super-paramagnetic artificial cilia, they mimic the asymmetric motion of natural cilia, consisting of an effective and recovery stroke. When a phase difference is prescribed between neighbouring cilia, metachronal waves develop. Due to the discrete nature of the cilia, the metachronal waves change direction when the phase difference becomes sufficiently large, resulting in antiplectic as well as symplectic metachrony. We show that the fluid flow created by the artificial cilia is significantly enhanced in the presence of metachronal waves and that the fluid flow becomes unidirectional. Antiplectic metachrony is observed to lead to a considerable enhancement in flow compared to symplectic metachrony, when the cilia spacing is small. Obstruction of flow in the direction of the effective stroke for the case of symplectic metachrony was found to be the key mechanism that governs this effect.
A ‘reciprocal’ theorem for the prediction of loads on a body moving in an inhomogeneous flow at arbitrary Reynolds number
Authors: Magnaudet Jacques 
Published: October 2011

AbstractSeveral forms of a theorem providing general expressions for the force and torque acting on a rigid body of arbitrary shape moving in an inhomogeneous incompressible flow at arbitrary Reynolds number are derived. Inhomogeneity arises because of the presence of a wall that partially or entirely bounds the fluid domain and/or a non-uniform carrying flow. This theorem, which stems directly from Navier–Stokes equations and parallels the well-known Lorentz reciprocal theorem extensively employed in low-Reynolds-number hydrodynamics, makes use of auxiliary solenoidal irrotational velocity fields and extends results previously derived by Quartapelle & Napolitano (AIAA J., vol. 21, 1983, pp. 911–913) and Howe (Q. J. Mech. Appl. Maths, vol. 48, 1995, pp. 401–426) in the case of an unbounded flow domain and a fluid at rest at infinity. As the orientation of the auxiliary velocity may be chosen arbitrarily, any component of the force and torque can be evaluated, irrespective of its orientation with respect to the relative velocity between the body and fluid. Three main forms of the theorem are successively derived. The first of these, given in (2.19), is suitable for a body moving in a fluid at rest in the presence of a wall. The most general form (3.6) extends it to the general situation of a body moving in an arbitrary non-uniform flow. Specific attention is then paid to the case of an underlying time-dependent linear flow. Specialized forms of the theorem are provided in this situation for simplified body shapes and flow conditions, in (3.14) and (3.15), making explicit the various couplings between the body’s translation and rotation and the strain rate and vorticity of the carrying flow. The physical meaning of the various contributions to the force and torque and the way in which the present predictions reduce to those provided by available approaches, especially in the inviscid limit, are discussed. Some applications to high-Reynolds-number bubble dynamics, which provide several apparently new predictions, are also presented.
Unsteady flow in a rotating torus after a sudden change in rotation rate
Authors: Hewitt R. E. , Hazel A. L. , Clarke R. J. , Denier J. P. 
Published: October 2011

AbstractWe consider the temporal evolution of a viscous incompressible fluid in a torus of finite curvature; a problem first investigated by Madden & Mullin (J. Fluid Mech., vol. 265, 1994, pp. 265–217). The system is initially in a state of rigid-body rotation (about the axis of rotational symmetry) and the container’s rotation rate is then changed impulsively. We describe the transient flow that is induced at small values of the Ekman number, over a time scale that is comparable to one complete rotation of the container. We show that (rotationally symmetric) eruptive singularities (of the boundary layer) occur at the inner or outer bend of the pipe for a decrease or an increase in rotation rate respectively. Moreover, on allowing for a change in direction of rotation, there is a (negative) ratio of initial-to-final rotation frequencies for which eruptive singularities can occur at both the inner and outer bend simultaneously. We also demonstrate that the flow is susceptible to a combination of axisymmetric centrifugal and non-axisymmetric inflectional instabilities. The inflectional instability arises as a consequence of the developing eruption and is shown to be in qualitative agreement with the experimental observations of Madden & Mullin (1994). Throughout our work, detailed quantitative comparisons are made between asymptotic predictions and finite- (but small-) Ekman-number Navier–Stokes computations using a finite-element method. We find that the boundary-layer results correctly capture the (finite-Ekman-number) rotationally symmetric flow and its global stability to linearised perturbations.
A Yahgan for the killing: murder, memory and Charles Darwin
Authors: YANNIELLI JOSEPH L. 
Published: October 2011

AbstractIn March 1742, British naval officer John Byron witnessed a murder on the western coast of South America. Both Charles Darwin and Robert FitzRoy seized upon Byron's story a century later, and it continues to play an important role in Darwin scholarship today. This essay investigates the veracity of the murder, its appropriation by various authors, and its false association with the Yahgan people encountered during the second voyage of theBeagle(1831–1836). Darwin's use of the story is examined in multiple contexts, focusing on his relationship with the history of European expansion and cross-cultural interaction and related assumptions about slavery and race. The continuing fascination with Byron's story highlights the key role of historical memory in the development and interpretation of evolutionary theory.
Effects of grape seed extract supplementation on exercise-induced oxidative stress in rats
Authors: Belviranlı Muaz , Gökbel Hakkı , Okudan Nilsel , Başaralı Kemal 
Published: October 2011

The aim of the present study was to investigate the effects of grape seed extract (GSE) supplementation on exercise performance and oxidative stress in acutely and chronically exercised rats. A total of sixty-four male rats were used in the study. Rats were divided into six groups: control, chronic exercise control, acute exercise control (AEC), GSE-supplemented control, GSE-supplemented chronic exercise and GSE-supplemented acute exercise groups. Chronic exercise consisted of treadmill running at 25 m/min, 45 min/d, 5 d a week for 6 weeks. Rats in the acute exercise groups were run on the treadmill at 30 m/min until exhaustion. GSE were given at 100 mg/kg of body weight with drinking water for 6 weeks. Plasma was separated from blood samples for the analysis of oxidative stress markers. There was no significant difference in time of exhaustion between the acute exercise groups. Plasma malondialdehyde (MDA) levels were higher in the acute exercise groups and lower in the chronic exercise groups. GSE supplementation decreased MDA levels. Xanthine oxidase and adenosine deaminase activities were higher in the AEC group compared to all the other groups. NO levels were increased with both chronic exercise and GSE supplementation. Superoxide dismutase and glutathione peroxidase activities were lower in the acute exercised groups and higher in the chronic exercised groups. GSE supplementation caused an increase in antioxidant enzyme activities. In conclusion, GSE supplementation prevents exercise-induced oxidative stress by preventing lipid peroxidation and increasing antioxidant enzyme activities.
Cambrian to early Silurian ophiolite and accretionary processes in the Beishan collage, NW China: implications for the architecture of the Southern Altaids
Authors: AO S. J. , XIAO W. J. , HAN C. M. , LI X. H. , QU J. F. , ZHANG J. E. , GUO Q. Q. , TIAN Z. H. 
Published: October 2011

AbstractThe mechanism of continental growth of the Altaids is currently under debate between models invoking continuous subduction-accretion or punctuated accretion by closure of multiple ocean basins. We use the Yueyashan–Xichangjing ophiolite belt of the Beishan collage (southern Altaids) to constrain the earliest oceanic crust in the southern Palaeo-Asian Ocean. Five lithotectonic units were identified from S to N: the Huaniushan block, a sedimentary passive margin, the structurally incoherent Yueyashan–Xichangjing ophiolite complex, a coherent sedimentary package and the Mazongshan island arc with granitic rocks. We present a structural analysis of the accretionary complex, which is composed of the incoherent ophiolitic melange and coherent sedimentary rocks, to work out the tectonic polarity. A new weighted mean206Pb–238U age of 533 ± 1.7 Ma from a plagiogranite in the Yueyashan–Xichangjing ophiolite indicates that the ocean floor formed in early Cambrian time. Furthermore, we present new geochemical data to constrain the tectonic setting of the Yueyashan–Xichangjing ophiolite. The Yueyashan–Xichangjing ophiolite was emplaced as a result of northward subduction of an oceanic plate beneath the Mazongshan island arc to the north in late Ordovician to early Silurian time. Together with data from the literature, our work demonstrates that multiple overlapping periods of accretion existed in the Palaeozoic in the northern and southern Altaids. Therefore, a model of multiple accretion by closure of several ocean basins is most viable.
A longitudinal study of the bi-directional relationship between tobacco smoking and psychological distress in a community sample of young Australian women
Authors: Leung J. , Gartner C. , Hall W. , Lucke J. , Dobson A. 
Published: October 2011

BackgroundTobacco smoking and poor mental health are both prevalent and detrimental health problems in young women. The temporal relationship between the two variables is unclear. We investigated the prospective bi-directional relationship between smoking and mental health over 13 years.MethodParticipants were a randomly selected community sample of 10 012 young women with no experience of pregnancy, aged 18–23 years at baseline (1996) from the Australian Longitudinal Study on Women's Health. Follow-up surveys over 13 years were completed in 2000, 2003, 2006 and 2009, allowing for five waves of data. Measures included self-reported smoking and mental health measured by the Mental Health Index from the 36-item short-form health questionnaire and the 10-item Center for Epidemiologic Studies Depression Scale. Sociodemographic control variables included marital status, education level and employment status.ResultsA strong cross-sectional dose–response relationship between smoking and poor mental health was found at each wave [odds ratio (OR) 1.41, 95% confidence intervals (CI) 1.17–1.70 to OR 2.27, 95% CI 1.82–2.81]. Longitudinal results showed that women who smoked had 1.21 (95% CI 1.06–1.39) to 1.62 (95% CI 1.24–2.11) times higher odds of having poor mental health at subsequent waves. Women with poor mental health had 1.12 (95% CI 1.17–1.20) to 2.11 (95% CI 1.68–2.65) times higher odds of smoking at subsequent waves. These results held after adjusting for mental health history and smoking history and sociodemographic factors. Correlation analysis and structural equation modelling results were consistent in showing that both directions of the relationship were statistically significant.ConclusionsThe association between poor mental health and smoking in young women appeared to be bi-directional.
Memory control in post-traumatic stress disorder: evidence from item method directed forgetting in civil war victims in Northern Uganda
Authors: Zwissler B. , Hauswald A. , Koessler S. , Ertl V. , Pfeiffer A. , Wöhrmann C. , Winkler N. , Kissler J. 
Published: October 2011

BackgroundTraumatized individuals and particularly post-traumatic stress disorder (PTSD) patients are characterized by memory disturbances that suggest altered memory control. The present study investigated the issue using an item method, directed forgetting (DF) paradigm in 51 civil war victims in Uganda. All participants had been exposed to severe traumatic stress and 26 additionally suffered from PTSD.MethodIn an item cued, DF paradigm photographs were presented, each followed by an instruction to either remember or forget it. A recognition test for all initially presented photographs and thematically similar distracters followed. DF patterns were compared between the non-PTSD and the PTSD groups. Post-experimental ratings of picture valence and arousal were collected and correlated with DF.ResultsResults revealed DF, that is, reduced recognition for ‘to-be-forgotten’ items in the non-PTSD but not in the PTSD group. Moreover, in the non-PTSD, but not in the PTSD group, false alarms were reduced for ‘to-be-remembered’ items. Finally, DF was reduced in those participants who rated the pictures as more arousing, the PTSD group giving, on average, higher arousal ratings.ConclusionsData indicate that DF is reduced in PTSD and that the reduction is related to stimulus arousal. Furthermore, individuals with PTSD are characterized by a more global encoding style than individuals without PTSD, reflected in a higher false alarm rate. In sum, traumatized individuals with (but not without) PTSD are impaired in their ability to selectively control episodic memory encoding. This impairment may contribute to clinical features of the disorder such as intrusions and flashbacks.
Three-dimensional modeling of coordinate measuring machines probing accuracy and settings using fuzzy knowledge bases: Application to TP6 and TP200 triggering probes
Authors: Achiche Sofiane , Wozniak Adam 
Published: October 2011

AbstractOne of the fundamental elements that determines the precision of coordinate measuring machines (CMMs) is the probe, which locates measuring points within measurement volume. In this paper genetically generated fuzzy knowledge based models of three-dimensional (3-D) probing accuracy for one- and two-stage touch trigger probes are proposed. The fuzzy models are automatically generated using a dedicated genetic algorithm developed by the authors. The algorithm uses hybrid coding, binary for the rule base and real for the database. This hybrid coding, used with a set of specialized operators of reproduction, proved to be an effective learning environment in this case. Data collection of the measured objects' coordinates was carried out using a special setup for probe testing. The authors used a novel method that applies a low-force high-resolution displacement transducer for probe error examination in 3-D space outside the CMM measurement. The genetically generated fuzzy models are constructed for both one stage (TP6) and two stage (TP200) types of probes. First, the optimal number of settings is defined using an analysis of the influence of fuzzy rules on TP6 accuracy. Then, once the number of settings is obtained, near optimal fuzzy knowledge bases are generated for both TP6 and TP200 triggering probes, followed by analysis of the finalized fuzzy rules bases for knowledge extraction about the relationships between physical setup values and error levels of the probes. The number of fuzzy sets on each premise leads to the number of physical setups needed to get satisfactory error profiles, whereas the fuzzy rules base adds to the knowledge linking the design experiment parameters to the pretravel error of CMM machines. Satisfactory fuzzy logic equivalents of the 3-D error profiles were obtained for both TP6 and TP200 with root mean squsre errors ranging from 0.00 mm to a maximum of 0.58 mm.
DISPATCHES FROM A COLONIAL OUTPOST
Authors: Alamo Carlos 
Published: October 2011

AbstractOver the last few decades social movements and race scholars have begun to uncover and critically examine the social, economic, and political linkages shared between Puerto Ricans and African Americans. Much of this literature has focused exclusively on the period of the Civil Rights Movement with particular emphasis on the Young Lords and Black Panthers. Despite this rich and informative literature, we know very little of the connective social histories and relationships between African Americans and Puerto Ricans that preceded these later social movements. This article traces the historically contingent and multifaceted ways in which African American journalists, between 1942 and 1951, found new political meanings in Puerto Rico as the island underwent a massive economic and social transformation, and how they used that knowledge to reconceptualize challenges to Black personhood in the United States. Examining the Black popular press in Puerto Rico during this period reveals that Black journalists took an active interest in the island because it represented a useful point of comparison for understanding the internal colonial model of social inequality hampering the U.S. African American community during the first half of the twentieth century. The racialized nature of U.S. colonialism experienced by the island, the sociopolitical and economic effects of its monocultural sugar economy, and the second-class citizenship of Puerto Ricans were among the most salient factors that led African American journalists to a broader anti-imperialist understanding of racism, illuminating the lack of civil and economic rights Blacks experienced within the United States.