bluuebunny/crossref_metadata_2025_split huggingface dataset:
Trust of nurse practitioners and physicians among African Americans with hypertension
Authors: Benkert Ramona , Peters Rosalind , Tate Nutrena , Dinardo Ellen 
Published: May 2008

AbstractPurpose:To examine correlates of low‐income African Americans’ level of trust in healthcare providers. Specific aims were to (a) describe the levels and correlations of trust, mistrust, and satisfaction; (b) compare trust scores by provider type (nurse practitioner [NP] and medical doctor) and clinic type (nurse‐managed clinic [NMC] and joint‐managed clinic [JMC]); and (c) examine the relationship of patient and provider demographic factors (e.g., race concordance) with trust in the provider.Data sources:This descriptive cross‐sectional study was conducted with 145 low‐income African Americans (51% women, 49% men; mean age = 49.4 years). All participants were enrolled in a larger study that examined the effect of psychosocial variables on hypertension outcomes. Participants completed three questionnaires: Trust in Provider Scale, Cultural Mistrust Inventory, and the Michigan Academic Consortium Patient Satisfaction tool. Chart audits were performed to collect clinical data.Conclusions:Trust and satisfaction were moderately high,M= 3.9 (0.56),M= 4.1 (0.57), respectively, on the 5‐point scales, and cultural mistrust was in the moderate range,M= 3.9 (0.79), on a 7‐point scale. No significant differences in mistrust,t(142) =−1.43,p= .155, or satisfaction,t(142) = 0.716,p= .475, were noted by provider type. Trust was significantly higher for patients seen by NPs,t(142) = 2.57,p= .011. Additionally, patients seen in the NMC reported significantly higher levels of trust than those seen in the JMC,t(143) = 3.62,p< .001. Race concordance between provider and patient did not change these findings.Implications for practice:Low‐income African American patients have experienced unequal and discriminatory treatment, which can result in a cultural mistrust of providers; yet, providers in this study were able to engender high trust and satisfaction among these respondents. Still, the sociocultural effects of race concordance require further exploration to better understand the impact on trust in the patient–provider relationship. Finally, the high levels of trust in the NMC may offer a promising solution to the health disparities of African Americans; yet, more research is needed.
The role of serotonin in intestinal luminal sensing and secretion
Authors: Hansen M. Berner , Witte A.‐B. 
Published: May 2008

AbstractThis mini‐review addresses the role of the neuroendocrine substance serotonin (5‐hydroxytryptamine, 5‐HT) in intestinal luminal sensing and secretion. Intestinal sensory neurones are activated by several mechanisms, in particular following stimulation of ‘specialized’ cells in the mucosa. These specialized cells are the enteroendocrine cells, which contain a wide variety of neuroendocrine transmitters. One of these enteroendocrine cells is the enterochromaffin (EC) cell, which is present throughout the intestines and contains large amounts of serotonin, predominantly in the duodenum in humans. The EC cells act as mucosal sensory transducers and secrete serotonin in response to various physiological and pathological luminal stimuli. Following release, serotonin participates in several mucosal protecting processes, one being secretion. Serotonin stimulates active ion, mucus and fluid secretion. Epithelial 5‐HT2 receptors and neuronal 5‐HT1P, 5‐HT3 and 5‐HT4 receptors mediate the secretory effect of serotonin. A transmembrane serotonin transporter terminates epithelial serotonergic signalling. The transient receptor potential ion channel family is important for processing intestinal luminal sensory signalling. Accumulating evidence suggests a significant interaction between serotonin and one of the transient receptor potential ion channels, the capsaicin‐sensitive transient receptor potential vanilloid type 1. Accordingly, EC cells, serotonergic receptors and transporter(s), and transient receptor potential vanilloid type‐1 ion channels are all explored as pharmacological targets for treatment of some intestinal functional disorders.
Infinitely repeated contests: How strategic interaction affects the efficiency of governance
Authors: Shaffer Sherrill , Shogren Jason 
Published: May 2008

AbstractContests over the scope and strength of regulation and governance are commonplace – and commonly repeated. The same players vie for the same government prize year after year: for example, environmental standards, government contracts, research grants, and public good provision. The open question is whether more rents are dissipated in repeated regulatory contests than onetime competitions. This question matters for regulation and governance because societies should design policies to waste the fewest scarce resources. According to some, the answer is “no”, but others say “yes”– more resources are wasted when people compete repeatedly for the same government prize. Herein, we use two game theoretic equilibrium concepts to help untangle the answer. Our results suggest non‐myopic contestants are more likely to behave as partners than rivals – provided the context is relatively sterile. Several common complications help break up the tacit partnership, including a disparity in relative ability, a shrinking prize, and additional players.
Magmatic evolution of the Mantos Blancos copper deposit, Coastal Range of northern Chile: insight from Sr–Nd isotope, geochemical data and silicate melt inclusions
Authors: Ramírez Luis E. , Parada Miguel A. , Palacios Carlos , Wittenbrink Jens 
Published: May 2008

AbstractThe Mantos Blancos copper deposit (500 Mt at 1.0% Cu) was affected by two superimposed hydrothermal events: (i) phyllic alteration related to a rhyolitic dome emplacement and brecciation at ca 155 Ma; and (ii) potassic, sodic and propylitic alteration at ca 142 Ma, coeval with stocks and sills emplacement of dioritic and granodioritic porphyries, that locally grade upwards into polymictic magmatic hydrothermal breccias. Major hypogene copper sulfide mineralization is related to the second event. A late‐ore mafic dike swarm cross‐cuts all rocks in the deposit. Two types of granodioritic porphyries can be distinguished from petrographic observations and geochemical data: granodiorite porphyry I (GP I) and granodiorite porphyry II (GP II), which resulted from two different trends of magmatic evolution. The concave shape of the rare earth element (REE) distribution pattern together with the weak or absence of negative Eu anomalies in mafic dikes, dioritic and GP I porphyries, suggest hornblende‐dominated fractionation for this magmatic suite. In contrast, distinct negative Eu anomalies and the flat REE patterns suggest plagioclase‐dominated fractionation, at low oxygen fugacity, for the GP II porphyry suite. But shallow mixing and mingling between silicic and dioritic melts are also likely for the formation of the GP II and polymictic breccias, respectively. Sr‐Nd isotopic compositions suggest that the rhyolitic dome rocks were generated from a dominantly crustal source, while the GP I has mantle affinity. The composition of melt inclusions (MI) in quartz crystals from the rhyolitic dome is similar to the bulk composition of their host rock. The MI analyzed in quartz from GP II and in the polymictic magmatic hydrothermal breccia of the deposit are compositionally more evolved than their host rocks. Field, geochemical and petrographic data provided here point to dioritic and siliceous melt interaction as an inducing mechanism for the release of hydrothermal fluids to form the Cu mineralization.
Regional Probabilistic and Statistical Mineral Potential Mapping of Gold–Silver Deposits Using GIS in the Gangreung Area, Korea
Authors: Oh Hyun‐Joo , Lee Saro 
Published: May 2008

AbstractThe aim of the present study is to analyze relationships between epithermal Au‐Ag deposits of the hydrothermal type and related geological factors and integrate the relationships using probabilistic and statistical models in a geographic information system (GIS) environment. A variety of spatial geological data were compiled, evaluated and integrated to produce a map of potential Au and Ag deposits in the Gangreung area, Korea. This empirical approach assumes that all deposits shared a common genesis. The method consists of three main steps: (i) identification of spatial relationships; (ii) quantification of such relationships and (iii) integration of multiple quantified relationships. A spatial database containing Au and Ag deposits, topographic, geologic, geophysical and geochemical data was constructed using a GIS. The factors relating to 103 Au and Ag mineral deposits are the geological data such as lithology and fault structure, geochemical data including the abundance of Al, As, Ba, Ca, Cd, Co, conductivity, Cr, Cu, Eh, Fe, HCO3–, K, Li, Mg, Mn, Mo, Na, Ni, Pb, pH, Si, Sr, V, W, Zn, Cl−, F−, PO43−, NO2−, NO3− and SO42−, and geophysical data including Bouguer and magnetic anomalies. Using the constructed spatial database, the relationships between mineral deposit areas and 36 related factors are identified and quantified by probabilistic and statistical modeling; that is, likelihood ratio, weights of evidence and logistic regression. All the factors were combined to produce a map of the regional mineral potential using the overlay method in a GIS environment. The mineral potential map was then verified by comparison with known mineral deposits. The verification results give respective accuracies of 82.52%, 72.45% and 81.60% for the likelihood ratio, weights of evidence and logistic regression models, respectively. The mineral potential map can be used as a source of basic information for mineral resource development.
Nonisothermal
Transient Flow in Natural Gas Pipeline
Authors: Abbaspour M. , Chapman K.
S. 
Published: May 2008

Abstract
The fully implicit finite-difference method is used to solve the continuity, momentum, and energy equations for flow within a gas pipeline. This methodology (1) incorporates the convective inertia term in the conservation of momentum equation, (2) treats the compressibility factor as a function of temperature and pressure, and (3) considers the friction factor as a function of the Reynolds number and pipe roughness. The fully implicit method representation of the equations offers the advantage of guaranteed stability for a large time step, which is very useful for gas pipeline industry. The results show that the effect of treating the gas in a nonisothermal manner is extremely necessary for pipeline flow calculation accuracies, especially for rapid transient process. It also indicates that the convective inertia term plays an important role in the gas flow analysis and cannot be neglected from the calculation.
EVALUATING ENTREPRENEURSHIP PROGRAMMES – OBJECTIVES AND MEASUREMENT DILEMMAS
Authors: HAVNES PER-ANDERS , SKJEKKELAND LINE MARIE B 
Published: May 2008

The manifestation of entrepreneurship is new business ventures that may be organised within or outside existing firms. Governments in all countries in the industrial world attempt to encourage entrepreneurship as an instrument to renew and strengthen their economy. Many of these governments evaluate their policies by monitoring results of the programmes.This paper examines the evaluation of an ongoing entrepreneurial support programme in Norway. The evaluation of the programme demonstrates that inconsistent and ambiguous goals complicate the measurements that are required for the evaluation. Further complications arise from the fact that some goals are specified in quantitative, others in qualitative terms. Finally, the evaluation draws attention to the significance of the incubation period between cause and effect.Such problems indicate that however precise quantitative measures appear to be when presented in statistical table or graphs, caution is necessary when the measurements are used to assess the effects of programmes and activities.
Functional Neuroanatomy of Meaning Acquisition from Context
Authors: Mestres-Missé Anna , Càmara Estela , Rodriguez-Fornells Antoni , Rotte Michael , Münte Thomas F. 
Published: May 2008

Abstract
An important issue in language learning is how new words are integrated in the brain representations that sustain language processing. To identify the brain regions involved in meaning acquisition and word learning, we conducted a functional magnetic resonance imaging study. Young participants were required to deduce the meaning of a novel word presented within increasingly constrained sentence contexts that were read silently during the scanning session. Inconsistent contexts were also presented in which no meaning could be assigned to the novel word. Participants showed meaning acquisition in the consistent but not in the inconsistent condition. A distributed brain network was identified comprising the left anterior inferior frontal gyrus (BA 45), the middle temporal gyrus (BA 21), the parahippocampal gyrus, and several subcortical structures (the thalamus and the striatum). Drawing on previous neuroimaging evidence, we tentatively identify the roles of these brain areas in the retrieval, selection, and encoding of the meaning.
Timing, Storage, and Comparison of Stimulus Duration Engage Discrete Anatomical Components of a Perceptual Timing Network
Authors: Coull Jennifer T. , Nazarian Bruno , Vidal Franck 
Published: May 2008

Abstract
The temporal discrimination paradigm requires subjects to compare the duration of a probe stimulus to that of a sample previously stored in working or long-term memory, thus providing an index of timing that is independent of a motor response. However, the estimation process itself comprises several component cognitive processes, including timing, storage, retrieval, and comparison of durations. Previous imaging studies have attempted to disentangle these components by simply measuring brain activity during early versus late scanning epochs. We aim to improve the temporal resolution and precision of this approach by using rapid event-related functional magnetic resonance imaging to time-lock the hemodynamic response to presentation of the sample and probe stimuli themselves. Compared to a control (color-estimation) task, which was matched in terms of difficulty, sustained attention, and motor preparation requirements, we found selective activation of the left putamen for the storage (“encoding”) of stimulus duration into working memory (WM). Moreover, increased putamen activity was linked to enhanced timing performance, suggesting that the level of putamen activity may modulate the depth of temporal encoding. Retrieval and comparison of stimulus duration in WM selectively activated the right superior temporal gyrus. Finally, the supplementary motor area was equally active during both sample and probe stages of the task, suggesting a fundamental role in timing the duration of a stimulus that is currently unfolding in time.
Neural Organization of Linguistic Short-term Memory is Sensory Modality–dependent: Evidence from Signed and Spoken Language
Authors: Pa Judy , Wilson Stephen M. , Pickell Herbert , Bellugi Ursula , Hickok Gregory 
Published: May 2008

Abstract
Despite decades of research, there is still disagreement regarding the nature of the information that is maintained in linguistic short-term memory (STM). Some authors argue for abstract phonological codes, whereas others argue for more general sensory traces. We assess these possibilities by investigating linguistic STM in two distinct sensory–motor modalities, spoken and signed language. Hearing bilingual participants (native in English and American Sign Language) performed equivalent STM tasks in both languages during functional magnetic resonance imaging. Distinct, sensory-specific activations were seen during the maintenance phase of the task for spoken versus signed language. These regions have been previously shown to respond to nonlinguistic sensory stimulation, suggesting that linguistic STM tasks recruit sensory-specific networks. However, maintenance-phase activations common to the two languages were also observed, implying some form of common process. We conclude that linguistic STM involves sensory-dependent neural networks, but suggest that sensory-independent neural networks may also exist.
Enhancement of Auditory-evoked Potentials in Musicians Reflects an Influence of Expertise but not Selective Attention
Authors: Baumann Simon , Meyer Martin , Jäncke Lutz 
Published: May 2008

Abstract
Instrumental tones and, in some instances, simple sine-wave tones were shown to evoke stronger auditory-evoked responses in musicians compared to nonmusicians. This effect was taken as an example for plasticity in the auditory cortex elicited by training. To date, however, it is unknown whether an enlarged cortical representation for (instrumental) tones or increased neuronal activity provoked by focused attention in musicians accounts for the reported difference. In an attempt to systematically investigate the influence of attention on the processing of simple sine wave and instrumental tones, we compared auditory-evoked potentials recorded from musicians and nonmusicians. During the electroencephalogram recording, the participants were involved in tasks requiring selective attention to specific sound features such as pitch or timbre. Our results demonstrate that the effect of selective attention on the auditory event-related potential (AEP) has a different time course and shows a different topography than the reproduced effect of music expertise at the N1 component or the previously demonstrated effect at the P2 component. N1 peak potentials were unaffected by attention modulation. These results indicate that the effect of music expertise, which was traced by current density mapping to the auditory cortex, is not primarily caused by selective attention, and it supports the view that increased AEPs on tones in musicians reflect an enlarged neuronal representation for specific sound features of these tones. However, independent from the N1–P2 complex, attention evoked an Nd-like negative component in musicians but not in nonmusicians, which suggests that plasticity also affects top–down processes.
Convergence of the Visual Field Split: Hemispheric Modeling of Face and Object Recognition
Authors: Hsiao Janet Hui-wen , Shieh Danke X. , Cottrell Garrison W. 
Published: May 2008

Abstract
Anatomical evidence shows that our visual field is initially split along the vertical midline and contralaterally projected to different hemispheres. It remains unclear at which processing stage the split information converges. In the current study, we applied the Double Filtering by Frequency (DFF) theory (Ivry & Robertson, 1998) to modeling the visual field split; the theory assumes a right-hemisphere/low-frequency bias. We compared three cognitive architectures with different timings of convergence and examined their cognitive plausibility to account for the left-side bias effect in face perception observed in human data. We show that the early convergence model failed to show the left-side bias effect. The modeling, hence, suggests that the convergence may take place at an intermediate or late stage, at least after information has been extracted/encoded separately in the two hemispheres, a fact that is often overlooked in computational modeling of cognitive processes. Comparative anatomical data suggest that this separate encoding process that results in differential frequency biases in the two hemispheres may be engaged from V1 up to the level of area V3a and V4v, and converge at least after the lateral occipital region. The left-side bias effect in our model was also observed in Greeble recognition; the modeling, hence, also provides testable predictions about whether the left-side bias effect may also be observed in (expertise-level) object recognition.
A Fast Three-Dimensional Approximation for the Calculation of Surface Irradiance in Large-Eddy Simulation Models
Authors: Wapler Kathrin , Mayer Bernhard 
Published: May 2008

Abstract
Cloud-resolving models—in particular, large-eddy simulation (LES) models—are important tools to improve the understanding of cloud–radiation interactions. A method is presented for accurate, yet fast, three-dimensional calculation of surface shortwave irradiance within an LES model using the tilted independent column approximation with smoothing of the diffuse irradiance. The algorithm calculates a tilted optical thickness for each surface pixel that is then used as input to a one-dimensional radiative transfer code. In a sensitivity analysis, it is shown that this calculation can even be replaced by a simple precalculated lookup table that tabulates surface irradiance as a function of only solar zenith angle and cloud optical thickness. Because the vertical variability of the cloud is of little relevance for the surface irradiance, this approximation introduces little extra uncertainty. In a final step, surface irradiance is smoothed to account for horizontal photon transport between individual columns. The algorithm has been optimized for parallelization, which enhances its applicability in LES models. In this implementation, the total computational time of the LES model increased by only 3% relative to the reference run without radiation. Comparisons between the fast approximation and detailed three-dimensional radiative transfer calculations showed very good agreement for different cloud conditions and several solar zenith and azimuth angles, with a root-mean-square difference of 6%.