bluuebunny/crossref_metadata_2025_split huggingface dataset:
In Quest of productive modeling‐based learning discourse in elementary school science
Authors: Louca Loucas T. , Zacharia Zacharias C. , Constantinou Constantinos P. 
Published: August 2011

AbstractThe purpose of this study was to investigate whole classroom discourse during modeling‐based learning in science, seeking to describe the discourse's characteristics, its relation to the micro‐context in which it took place and to the student‐constructed models, and to ascertain when it becomes productive. Additionally, we aimed to describe how whole classroom modeling discourse in science may be better supported by the teacher as well as the role of the modeling tool. In doing so, we analyzed student conversations and student‐constructed models from two groups of 11‐ to 12‐year‐old students. All students used a computer programming environment, namely Stagecast Creator, as a modeling tool. Findings revealed three distinct discourse types (modeling frames): (a) (initial) phenomenological description, (b) operationalization of the physical system's story, and (c) construction of algorithms. Finally, we discuss what we consider productive modeling discourse, as well as the contributions of the software and the teacher in this respect. © 2011 Wiley Periodicals, Inc. J Res Sci Teach 48: 919–951, 2011
Gene expression during activation of Paracoccidioides brasiliensis conidia
Authors: Hernandez O. , Garcia A. M. , Almeida A. J. , Tamayo D. , Gonzalez A. , Restrepo A. , McEwen J. G. 
Published: August 2011

AbstractThis study focuses on gene expression during crucial biological phenomena of the dimorphic fungal human pathogen Paracoccidioides brasiliensis, the conidia‐to‐yeast (C‐Y) transition and the conidia‐to‐mycelia (C‐M) germination. We studied 10 genes involved in different cellular functions: oxidative stress response (alternative oxidase (AOX), superoxide dismutase (SOD), flavodoxin, conserved hypothetical protein (Y20)); cell metabolism (glyceraldehyde‐3‐phosphate dehydrogenase (GADPH), cholestenol Delta‐isomerase (ChDI), glycine dehydrogenase (GDh)) and heat shock response (Heat shock protein 90 (HSP90)), and cell synthesis and wall structure (glucan synthase‐1 (GS‐1), α‐1,3‐glucan synthase (αGS), and mannosyltransferase (MT)). Gene expression was measured during the first 72 h and 96 h of C‐Y and C‐M, respectively, previously shown to be a fundamental time frame for the consolidation of these cellular processes. The gene expression of AOX, GAPDH, HSP90, MT, αGS, and GDh was significantly increased during the C‐Y transition, while SOD, ChDI, GAPDH, MT, GDh, and GS‐1 were increased during C‐M germination. Additionally, some were highly expressed in each process: AOX, HSP90, and αGS during C‐Y; SOD, ChDI, and GS‐1 during C‐M. Altogether, these data add new information regarding gene expression during the C‐Y and C‐M processes. Future research will be targeted to further characterize the true relevance of the studied genes during the morphological transition, either during adaptation to the environment or to the infected host. Copyright © 2011 John Wiley & Sons, Ltd.
Long‐term Outcomes of Extended Proximal Gastrectomy for Oesophagogastric Junctional Tumours
Authors: Khan Omar , Goh Steven , Byrne Ben , Somers Shaw , Mercer Stuart , Toh Simon 
Published: August 2011

AbstractBackgroundThere is no consensus on the optimum approach for resection of oesophagogastric junctional (OGJ) tumours. We prospectively evaluated the efficacy of transabdominal radical extended proximal gastrectomy with oesophagogastric anastomosis (EPGOG) for selected tumours of the OGJ.MethodsBetween 1998 and 2007, 66 selected consecutive patients with tumours of the OGJ underwent successful EPGOG. Selection was limited to tumours where the maximal proximal extent was 36 cm ab oral. Pre‐, peri‐, and postoperative outcomes together with long‐term survival data for these patients were prospectively collected.ResultsMedian theatre time was 242 min (range = 120–480), with a median blood loss of 300 ml (range = 50–1720). Eighty‐nine percent of patients were extubated in theatre; major complications occurred in 9 (14%) patients, with an overall in‐hospital mortality rate of 8%. Thirty‐five (53%) patients had nodal disease and the median lymph node yield was 13 (range = 4–36), with an R0 resection rate of 80%. In terms of long‐term outcomes, the 2‐ and 5‐year actuarial survival rates were 54 ± 6% and 41 ± 6%.ConclusionExtended radical proximal gastrectomy with oesophagogastric anastomosis for selected junctional tumours is a feasible technique which does not compromise oncological principles as evidenced by an excellent long‐term survival rate.
Percutaneous Fasciotomy for the Treatment of Dupuytren's Disease—A Systematic Review
Authors: Salhi Saoussen , Cardin-Langlois Etienne , Luc Mario 
Published: August 2011

Background Dupuytren's disease is described as a thickening of the palmar fascia. It typically affects men of Northern European descent in their fifties. The disease process starts as a nodule at the distal palmar crease that progressively gives rise to a cord invading distally toward the finger. Historically, different treatments have been described. Our purpose was to perform a meta-analysis of the evidence published on the percutaneous fasciotomy (PCF) treatment. Methods We searched Medline, PubMed, and the Cochrane Library for articles evaluating the use of PCF for Dupuytren's disease. No study was excluded based on quality. Results The search yielded nine studies. Because of their different methodologies, a meta-analysis could not be performed. However, we were able to extract common qualitative conclusions. PCF is an effective treatment modality for patients in whom general anesthesia is contraindicated, with a good outcome especially at the metacarpophalangeal joint, a low recurrence rate in the short term, and few complications. Conclusions Similar conclusions were reached by all the articles under study. Nevertheless, there remains the need for a prospective study with a higher statistical power and standardized clinical evaluation and surgical methods in order to achieve more objective quantitative results. It would also be pertinent to compare the outcomes and complication rates of PCF with the new collagenase treatment.
Changing Trends in Pediatric Upper Extremity Electrical Burns
Authors: Talbot Simon G. , Upton Joseph , Driscoll Daniel N. 
Published: August 2011

Background Upper extremity electrical burns are a cause of major morbidity and disability in affected individuals. Anecdotally, we have noted changes in the presentation of cases to our institution. We sought to compare current data on upper extremity electrical burns in children with our previously published historical data. Methods Using the Shriners Hospital Boston and American Burn Association databases, we retrospectively analyzed electrical upper extremity burns in patients aged 21 years or younger. Data regarding demographics, etiology, and reconstruction were collated and analyzed. Results In our institutional cohort, patients were most commonly males (37/48, 77%) aged 10–15 years (19/48, 40%). We have seen a rise in the proportion of female, younger patients, with burns attributed to domestic wiring, indicative of a reduction in the number of high-voltage injuries in males due to demonstrations of bravado. High-voltage injuries correlate with severity of injury and tended to be transferred to our institution from foreign countries (9/48, 19%). We have also seen a reduction in the need to amputate extremities. Conclusions Changes in upper extremity electrical burn demographics and etiology since the 1970s may be indicative of effective education and safety campaigns. Consequently, reconstructive requirements have also changed. We hope that similar ongoing efforts in the developing world may bring about comparable positive results.
Flow visualization using reflective flakes
Authors: Goto Susumu , Kida Shigeo , Fujiwara Shohei 
Published: August 2011

AbstractThe pattern in an image of flow visualizations using reflective flakes stems from their non-uniform orientation rather than their spatial accumulation. It is shown, based on the assumption that flakes are infinitely thin elliptic discs without inertia, that the temporal evolution of their orientations is identical to that for infinitesimal material surface elements. In general, bright regions in a visualized image are the superposition of those where the flake (i.e. the material surface element) orientation is isotropic and those where flakes tend to align in the direction for which the incident rays are reflected into the line of sight. A non-trivial example of the visualization of a steady flow in a precessing sphere is given to verify these conclusions.
THE INVARIANTS FIELD OF SOME FINITE PROJECTIVE LINEAR GROUP ACTIONS
Authors: CHEN YIN 
Published: August 2011

AbstractLet Fq be a finite field with q elements, V an n-dimensional vector space over Fq and 𝒱 the projective space associated to V. Let G≤GLn(Fq) be a classical group and PG be the corresponding projective group. In this note we prove that if Fq (V )G is purely transcendental over Fq with homogeneous polynomial generators, then Fq (𝒱)PG is also purely transcendental over Fq. We compute explicitly the generators of Fq (𝒱)PG when G is the symplectic, unitary or orthogonal group.
EFFECT OF ORGANIC FERTILIZERS ON NITRATE ACCUMULATION IN VEGETABLES AND MINERAL NITROGEN IN TROPICAL SOILS OF MOROGORO, TANZANIA
Authors: BAITILWAKE MARCELINA A , DE BOLLE SARA , SALOMEZ JOOST , MREMA JEROME P , DE NEVE STEFAAN 
Published: August 2011

SUMMARYNitrogen (N) nutrition is a key factor for vegetable growth and yield. However, different rates of nitrogen fertilization may trigger different responses to vegetables. A survey was conducted to investigate the effect of soil fertility management practices on nitrate concentration in vegetables. The survey results were used to plan experiments on the effect of chicken and cattle manures on nitrate levels in Chinese cabbage (Brassica rapa) and amaranthus (Amaranthus cruentus) grown in Tanzania and the patterns of mineral nitrogen in soils under open field conditions. Chicken or cattle manure at 200, 300 kg N ha−1and 170 250 kg N ha−1for Chinese cabbage and amaranthus respectively, and control were compared in a randomized complete block design. We observed a higher nitrate content in fertilized Chinese cabbage at day 30 than at day 44 after sowing, ranging from 3243 to 4993 mg kg−1fresh matter regardless of the N source and rates. Only application of manures at high levels (250 kg N ha−1) induced significantly (p< 0.05) higher nitrate contents in amaranthus at day 28 after sowing, although there was a clear indication of nitrate accumulation even at 170 kg N ha−1application. Soil NH4+-N + NO3−-N in both Chinese cabbage and amaranthus plots were increased with increasing N application rates and differences between control and amended soils were significant (p< 0.01). There was a positive relationship between NO3−concentration in vegetables and NO3−-N in the rooted top soil layer (0–15 cm). However, higher NH4+concentrations depressed NO3−build up in crops and a significant negative relationship between soil (NH4+-N)/(NO3−-N) ratio and crop NO3−content was found. It is concluded that low manure application rates result in similar yields to high rates but reduces nitrate accumulation in vegetables and excess mineral nitrogen in soils.
Risk factors for Salmonella prevalence in laying-hen farms in Japan
Authors: SASAKI Y. , MURAKAMI M. , MARUYAMA N. , TSUJIYAMA Y. , KUSUKAWA M. , ASAI T. , YAMADA Y. 
Published: August 2011

SUMMARYHuman salmonellosis cases, particularly those caused by Salmonella Enteritidis, have been closely linked to egg consumption. This epidemiological survey was conducted to determine the baseline Salmonella prevalence and identify the risk factors for Salmonella prevalence in laying-hen farms in Japan. Caecal excrement samples and dust samples were obtained from 400 flocks in 338 laying-hen farms. Salmonella was identified in 20·7% of the farms and 19·5% of the flocks. The prevalence of Salmonella was significantly higher in flocks reared in windowless houses than in those reared in open houses. In addition, the risk of Salmonella presence was significantly higher when the windowless house farms implemented induced moulting or in-line egg processing. Efforts to reduce human salmonellosis in Japan should continue to focus on the establishment of control measures in laying-hen farms, especially those with windowless houses implementing induced moulting and equipped with in-line egg processing.
Household preferences for municipal water services in Nicaragua
Authors: Vásquez William F. , Franceschi Dina , Van Hecken Gert T. 
Published: August 2011

AbstractChoice models and a referendum format contingent valuation survey are used to investigate household preferences for improved water services and decentralization levels (actual departmental administration vs. further decentralization to the municipality) in urban Matiguás, Nicaragua. Choice models suggest that households prefer the current departmental administration over municipal provision for service and capacity, but believe that the municipality would be more interested in improving services. Results also indicate that households are willing to pay an increment of at least 112 per cent above their current monthly water bill for reliable and safe drinking water services, regardless of administration type.
Is natural openness or trade policy good for the environment?
Authors: Yamarik Steven , Ghosh Sucharita 
Published: August 2011

AbstractIn this paper, we estimate the individual effects of natural openness and trade policy on air pollution. Natural openness is the component of the trade share (imports and exports as a percentage of GDP) attributable to population, geography and factor endowment differences. We find that natural openness reduces air pollution, while trade policy has a limited impact. The implication is that ‘natural’ geographic and endowment differences play a more important role than deliberate trade policy decisions in explaining the trade and environment link.
Using organizational economics to engage cultural key masters in creating change in forensic science administration to minimize bias and errors
Authors: COWAN EVERARD JAMES 
Published: August 2011

Abstract:The administration of the forensic science process falls into the hands of supervisors, local administrators, and prosecution attorneys and police agencies. In the current structure, the police and prosecution are the principal and the forensic scientists the agent. I identify changes that must be made in that relationship to eliminate biases and to determine the major obstacles that stand in the way of creating the necessary changes. I focus on the ‘middle managers’ – the supervisors and laboratory directors – as the cultural key masters. I recommend: mechanism design principles to enable laboratories to report to a board of directors, rather than the prosecutor and police; for the development of compensation plans for middle managers to build a culture of learning based on error tolerance rather than error punishment; and for the use of intrinsic and extrinsic motivations to facilitate the identity changes of cultural key masters.
Protein kinase D controls voluntary-running-induced skeletal muscle remodelling
Authors: Ellwanger Kornelia , Kienzle Christine , Lutz Sylke , Jin Zheng-Gen , Wiekowski Maria T. , Pfizenmaier Klaus , Hausser Angelika 
Published: August 2011

Skeletal muscle responds to exercise by activation of signalling pathways that co-ordinate gene expression to sustain muscle performance. MEF2 (myocyte enhancer factor 2)-dependent transcriptional activation of MHC (myosin heavy chain) genes promotes the transformation from fast-twitch into slow-twitch fibres, with MEF2 activity being tightly regulated by interaction with class IIa HDACs (histone deacetylases). PKD (protein kinase D) is known to directly phosphorylate skeletal muscle class IIa HDACs, mediating their nuclear export and thus derepression of MEF2. In the present study, we report the generation of transgenic mice with inducible conditional expression of a dominant-negative PKD1kd (kinase-dead PKD1) protein in skeletal muscle to assess the role of PKD in muscle function. In control mice, long-term voluntary running experiments resulted in a switch from type IIb+IId/x to type IIa plantaris muscle fibres as measured by indirect immunofluorescence of MHCs isoforms. In mice expressing PKD1kd, this fibre type switch was significantly impaired. These mice exhibited altered muscle fibre composition and decreased running performance compared with control mice. Our findings thus indicate that PKD activity is essential for exercise-induced MEF2-dependent skeletal muscle remodelling in vivo.
Simultaneous recognition and segmentation of cells: application in C.elegans
Authors: Qu Lei , Long Fuhui , Liu Xiao , Kim Stuart , Myers Eugene , Peng Hanchuan 
Published: August 2011

Abstract
Motivation: Automatic recognition of cell identities is critical for quantitative measurement, targeting and manipulation of cells of model animals at single-cell resolution. It has been shown to be a powerful tool for studying gene expression and regulation, cell lineages and cell fates. Existing methods first segment cells, before applying a recognition algorithm in the second step. As a result, the segmentation errors in the first step directly affect and complicate the subsequent cell recognition step. Moreover, in new experimental settings, some of the image features that have been previously relied upon to recognize cells may not be easy to reproduce, due to limitations on the number of color channels available for fluorescent imaging or to the cost of building transgenic animals. An approach that is more accurate and relies on only a single signal channel is clearly desirable.
Results: We have developed a new method, called simultaneous recognition and segmentation (SRS) of cells, and applied it to 3D image stacks of the model organism Caenorhabditis elegans. Given a 3D image stack of the animal and a 3D atlas of target cells, SRS is effectively an atlas-guided voxel classification process: cell recognition is realized by smoothly deforming the atlas to best fit the image, where the segmentation is obtained naturally via classification of all image voxels. The method achieved a 97.7% overall recognition accuracy in recognizing a key class of marker cells, the body wall muscle (BWM) cells, on a dataset of 175 C.elegans image stacks containing 14 118 manually curated BWM cells providing the ‘ground-truth’ for accuracy. This result was achieved without any additional fiducial image features. SRS also automatically identified 14 of the image stacks as involving ±90○ rotations. With these stacks excluded from the dataset, the recognition accuracy rose to 99.1%. We also show SRS is generally applicable to other cell types, e.g. intestinal cells.
Availability: The supplementary movies can be downloaded from our web site http://penglab.janelia.org/proj/celegans_seganno. The method has been implemented as a plug-in program within the V3D system (http://penglab.janelia.org/proj/v3d), and will be released in the V3D plugin source code repository.
Contact: pengh@janelia.hhmi.org
Error patterns in age estimation of harp seals (Pagophilus groenlandicus): results from a transatlantic, image-based, blind-reading experiment using known-age teeth
Authors: Frie Anne K. , Fagerheim Kjell-Arne , Hammill Mike O. , Kapel Finn O. , Lockyer Christina , Stenson Garry B. , Rosing-Asvid Aqqalu , Svetochev Vladislav 
Published: August 2011

Abstract
Frie, A. K., Fagerheim, K-A., Hammill, M. O., Kapel, F. O., Lockyer, C., Stenson, G. B., Rosing-Asvid, A., and Svetochev, V. 2011. Error patterns in age estimation of harp seals (Pagophilus groenlandicus): results from a transatlantic, image-based, blind-reading experiment using known-age teeth. – ICES Journal of Marine Science, 68: 1942–1953. Blind readings of known-age samples are the ultimate quality control method for age estimates based on hard tissues. Unfortunately, this is often not feasible for many species because of the scarcity of known-age samples. Based on a unique collection of known-age teeth of harp seals (age range: 1–18 years), ageing errors were evaluated in relation to true age, reader experience, sex, and tooth format (images vs. originals). Bias was estimated by linear models fitted to deviations from true age, and precision was estimated as their residual standard error. Image-based blind readings of 98 tooth sections by 14 readers, representing different levels of experience, generally showed high accuracy and precision up to a seal age of ∼8 years, followed by an increasingly negative bias and increased variance. Separate analyses were therefore conducted for young seals (1–7 years) and older seals. For young seals, moderate associations were found between reader experience and levels of bias, precision, and proportions of correct readings. For older seals, only precision levels showed a significant association with reader experience. Minor effects of sex and tooth format are unlikely to affect these main patterns. Observed errors, even for highly experienced readers, may affect important age-related parameters, emphasizing the importance of known-age calibration of the output from all readers.
Estimation of total retained catch based on frequency of fishing trips, inspections at sea, transhipment, and VMS data
Authors: Aanes Sondre , Nedreaas Kjell , Ulvatn Sigbjørn 
Published: August 2011

Abstract
Aanes, S., Nedreaas, K., and Ulvatn, S. 2011. Estimation of total retained catch based on frequency of fishing trips, inspections at sea, transhipment, and VMS data. – ICES Journal of Marine Science, 68: 1598–1605. The satellite-based vessel monitoring system in the Norwegian Economic Zone provides detailed information about individual trips by vessels. Vessel sizes are available through official registries, and the storage capacity for fish is estimated using the established conversion factors as a function of the vessel's gross registered tonnage. Scientists have had access to the database of both transport and fishing vessels, with records for individual trips, in addition to information about the total round weight (whole fish) of cod and haddock for trips inspected by the coastguard. The analysis assumes that trips with complete documentation of the fish on board are a random sample, so allowing estimation of the mean amount of both cod and haddock per trip, and annual totals give the number of trips per vessel annually. ICES has accepted this methodology for estimating illegal, unregulated, and unreported (IUU) catches, which has resulted in 15 000–166 000 t (3–35%) being added to the officially reported landings of Northeast Arctic cod during the years 2002–2008. IUU landings have decreased in recent years, but are so important for assessment and management that estimates continue to be made annually.
Disruption of essential habitat by a coastal invader: new evidence of the effects of green crabs on eelgrass beds
Authors: Malyshev Andrey , Quijón Pedro A. 
Published: August 2011

AbstractMalyshev, A., and Quijón, P. A. 2011. Disruption of essential habitat by a coastal invader: new evidence of the effects of green crabs on eelgrass beds. – ICES Journal of Marine Science, 68: 1852–1856. Eelgrass (Zostera marina) beds have been declining in Atlantic Canada and elsewhere, partly as a result of sediment disruption and direct feeding/cutting of basal meristems by the green crab (Carcinus maenas). Green crabs are detrimental to eelgrass beds, and field and laboratory experiments have confirmed that the deleterious role of this invasive species is mediated by at least two mechanisms, depending on the size/age of the crabs: uprooting by adults and grazing by juveniles. Eelgrass uprooting and grazing by green crabs are likely to contribute to further declines or a lack of recovery of eelgrass beds.