bluuebunny/crossref_metadata_2025_split huggingface dataset:
Determination of polyolefin additives by reversed-phase liquid chromatography
Authors: Dopico-García M. , Noguerol-Cal Rosalía , Castro-López M. , Cela-Pérez M. , Piñón-Giz Elena , López-Vilariño Jose , González-Rodríguez M. 
Published: March 2012

Abstract
This article examines the contribution of liquid chromatography to the study of polyolefin additives commonly used to obtain improved environmental resistance (antioxidants, ultraviolet light stabilizers, antistatics, and so on) and appearance enhancements (e.g. colorants). Several reversed-phase liquid chromatographic methods are summarized, and a detailed description of different detectors is provided. In addition, ways of applying these methods to analyse food contact materials and plastic toys are emphasized. Finally, the potential use of these methods is addressed which complies with European health safety regulations.
Morphological, structural and optical properties of MoO2 films electrodeposited on SnO2∣glass plate
Authors: Dukstiene Nijole , Sinkeviciute Dovile , Guobiene Asta 
Published: March 2012

Abstract
MoO2 films were prepared by electrodeposition under potential controlled conditions from an aqueous alkaline solution of sodium molybdate. Optical microscopy showed that films of different morphology were deposited. The surface roughness and grain size were determined by atomic force microscopy. The characterization of as-deposited films by X-ray diffraction analysis revealed their amorphous nature. The optical constants of films were derived from transmittance spectra recorded in the 310–1100 nm wavelength range. All films were highly absorptive and showed a direct band to band transition. From the absorption edge data, the values of the optical band gap E g and the Urbach energy E U were determined based on Tauc’s model. The influence of film thickness on the extinction coefficient k, refractive index n, absorption coefficient a and the band gap energy E g was studied.
Unusual reaction of 3,4-bis(3-nitrofurazan-4-yl)furoxan with ammonia, primary amines and hydrazine
Authors: Astrat’ev Alexander , Dashko Dmitry , Stepanov Andrei 
Published: March 2012

Abstract
The nucleophilic displacement of two nitro groups in 3,4-bis(3-nitrofurazan-4-yl)furoxan with ammonia, primary aliphatic amines and hydrazine leads to formation of a novel heterocyclic system, 7H-tris[1,2,5]oxadiazolo[3,4-b:3′,4′-d:3″,4″-f]azepine. The reaction of compound 1 with secondary aliphatic amines proceeds in a typical way for nitrofurazans when the nitro-group in the starting compound is substituted by RR’N-group.
Ionic liquids in microextraction techniques
Authors: Vičkačkaitė Vida , Padarauskas Audrius 
Published: March 2012

Abstract
The tremendous potential of room temperature ionic liquids as an alternative to environmentally harmful ordinary organic solvents is well recognized. Due to their unique properties, such as low volatility, tunable viscosity and miscibility, and electrolytic conductivity, ionic liquids have attracted extensive attention and gained popularity in many areas of analytical chemistry including modern sample preparation techniques. In this review the advantages and limitations of application of ionic liquids as solvents/sorbents for microextraction are critically discussed. Topics covered include solid-phase microextraction, single drop microextraction, dispersive liquid-liquid microextraction and hollow-fiber liquid-phase microextraction. The compatibility of the ionic liquid-based microextraction with different analytical techniques such as gas chromatography, high-performance liquid chromatography, electrothermal or flame atomic absorption spectrometry and some others is also discussed. Finally, the main practical applications on this topic are summarized.
Impact of un-polymerized acrylamide monomer residues onto protein identification by MALDI TOF MS
Authors: Talian Ivan , Kováčová Veronika , Petrovič Marián , Sabo Ján 
Published: March 2012

Abstract
Polyacrylamide gel electrophoresis is a powerful tool for protein mixture separation frequently used in proteomic studies. This article describes the problems which can arise during the identification process of separated proteins by matrix assisted laser desorption/ionization mass spectrometry. Presence of residual acrylamide monomers in the peptide samples leads to a significant peptide signal suppression. In the case of protein prohibitin, isolated from the MCF 7 breast cancer cell line, the peptide signal suppression was observed in 50% of all detected peptides.
Mercury determination and speciation analysis in surface waters
Authors: Mladenova Elisaveta , Dakova Ivanka , Tsalev Dimiter , Karadjova Irina 
Published: March 2012

Abstract
A sorbent L-cysteine grafted silica gel has been evaluated for separation and enrichment of dissolved inorganic i-Hg(II) and methylmercury CH3Hg(I) from surface waters at sub-µg L−1 concentrations. Chemical parameters for mercury species enrichment and separation have been optimized. Analytical schemes for the determination of Hg species, using selective column solid phase extraction (SPE) with continuous flow chemical vapor generation atomic absorption spectrometry (CF-CVG-AAS) or inductively coupled plasma-mass spectrometry (ICP-MS) were developed. Possibilities for on-site SPE enrichment were demonstrated as well. The limits of quantification were 1.5 and 5 ng L−1 for dissolved i-Hg(II) and CH3Hg(I) by CF-CVG-AAS and 1 and 2.5 ng L−1 by ICP-MS with relative standard deviations between 7–12% and 7–14%, respectively. The chemically modified SPE sorbent has demonstrated high regeneration ability, chemical and mechanical stability, acceptable capacity and good enrichment factors. Results for total dissolved mercury were in reasonable agreement with those from independent analyses by direct ICP-MS determinations for river waters and for estuarine water certified reference material.
Skew Killing spinors
Authors: Habib Georges , Roth Julien 
Published: March 2012

Abstract
We study the existence of a skew Killing spinor on 2- and 3-dimensional Riemannian spin manifolds. We establish the integrability conditions and prove that these spinor fields correspond to twistor spinors in the two dimensional case while, up to a conformal change of the metric, they correspond to parallel spinors in the three dimensional case.
Stress coping and psychological adaptation in the international students
Authors: Sapranaviciute Laura , Perminas Aidas , Pauziene Neringa 
Published: March 2012

Abstract
International students all over the world meet a lot of stressful situations due to different academic demands, cultural context, language problems and other adaptation difficulties. There is little evidence to explain what stress coping strategies are used by international students to cope with stressful situations and how they are connected to psychological adaptation. So the purpose of this study was to assess associations between psychological adaptation and stress coping strategies in international and domestic students. The study recruited 356 students: 258 host and 98 international students. Stress coping strategies were measured by Coping Orientation of Problem Experience questionnaire. Zung Self-Rating Depression Scale was used to measure depressive symptoms. Stress related health complaints were measured using a scale devised by the authors of this study. The study ascertained that in stressful situations international students used different stress coping strategies when compared to domestic students. Moreover, stress coping strategies used by international and domestic students were differently connected to health outcomes. The study pointed out that by researchers and counselors’ special attention should be given to international students.
Trunk, Pelvis, Hip, and Knee Kinematics, Hip Strength, and Gluteal Muscle Activation During a Single-Leg Squat in Males and Females With and Without Patellofemoral Pain Syndrome
Authors: Nakagawa Theresa H. , Moriya Érika T.U. , Maciel Carlos D. , SerrãO Fábio V. 
Published: March 2012

Study Design Controlled laboratory study using a cross-sectional design. Objectives To determine whether there are any differences between the sexes in trunk, pelvis, hip, and knee kinematics, hip strength, and gluteal muscle activation during the performance of a single-leg squat in individuals with patellofemoral pain syndrome (PFPS) and control participants. Background Though there is a greater incidence of PFPS in females, PFPS is also quite common in males. Trunk kinematics may affect hip and knee function; however, there is a lack of studies of the influence of the trunk in individuals with PFPS. Methods Eighty subjects were distributed into 4 groups: females with PFPS, female controls, males with PFPS, and male controls. Trunk, pelvis, hip, and knee kinematics and gluteal muscle activation were evaluated during a single-leg squat. Hip abduction and external rotation eccentric strength was measured on an isokinetic dynamometer. Group differences were assessed using a 2-way multivariate analysis of variance (sex by PFPS status). Results Compared to controls, subjects with PFPS had greater ipsilateral trunk lean (mean ± SD, 9.3° ± 5.3° versus 6.7° ± 3.0°; P = .012), contralateral pelvic drop (10.3° ± 4.7° versus 7.4° ± 3.8°; P = .003), hip adduction (14.8° ± 7.8° versus 10.8° ± 5.6°; P<.0001), and knee abduction (9.2° ± 5.0° versus 5.8° ± 3.4°; P<.0001) when performing a single-leg squat. Subjects with PFPS also had 18% less hip abduction and 17% less hip external rotation strength. Compared to female controls, females with PFPS had more hip internal rotation (P<.05) and less muscle activation of the gluteus medius (P = .017) during the single-leg squat. Conclusion Despite many similarities in findings for males and females with PFPS, there may be specific sex differences that warrant consideration in future studies and when clinically evaluating and treating females with PFPS. J Orthop Sports Phys Ther 2012;42(6):491–501, Epub 8 March 2012. doi:10.2519/jospt.2012.3987
Emprise criminelle familiale
Authors: Bessoles Philippe 
Published: March 2012

Élargissant la notion de famille à toute forme groupale restreinte et élargie du lien, nous proposons une analyse du meurtre dans les familles comme dépôt de la pulsion d’emprise. Le paradigme psychopathologique est la paranoïa. Le but du crime n’est pas la destructivité, fût-elle inévitable, de l’autre mais la logique de la toute-puissance exercée sur l’altérité, la construction sociale et sociétale. Le père incestueux, le criminel, le serial killer , le dictateur procèdent des mêmes logiques inconscientes définies par l’emprise : la cruauté, la fécalisation et le sadisme. L’enjeu est la maîtrise de l’objet, de l’espace et du temps dans une quête d’un pouvoir absolu.
L'enfant idéal, un frère sacrifié. Du fratricide à la cession altruiste
Authors: Houssier Florian 
Published: March 2012

Le frère constitue un objet primaire dans l’histoire des investissements libidinaux du sujet ; l’élaboration de la haine, participant de l’intégration de l’ambivalence, représente un enjeu central du lien fraternel. En entrecroisant la mythologie et la clinique du fratricide, nous proposons l’hypothèse d’une préférence incestueuse d’un parent envers son enfant, celui qui sera tué/sacrifié par le frère rival. Le meurtre fratricide y apparaît comme un équivalent de scène primitive du meurtre intrafamilial, l’envers de la haine fratricide prenant notamment la forme de la cession altruiste.
Présentation du dossier inédit d'Élisabeth Geblesco sur Pierre Rivière, 1973
Authors: Aleksić Branko 
Published: March 2012

Le cas de Pierre Rivière, qui a commis un parricide retentissant au XIX e siècle, a été étudié au cours d’un séminaire de Foucault en 1973, dans le cadre des rapports entre psychiatrie et justice pénale. Dans les archives d’Élisabeth Geblesco, psychanalyste, qui a assisté à ce séminaire, nous avons trouvé un manuscrit relatif au Mémoire (1836) de Rivière, édité et commenté par Foucault au cours du travail collectif au Collège de France en 1973. L’analyse d’Élisabeth Geblesco, transcrite ici pour la première fois, comble la lacune laissée dans le dossier constitué par Foucault : les états de paranoïa et de l’inceste, remplacent ce « brouillard » des discours juridique et de médecine mentale. L’acte de Rivière serait resté incompréhensible sans l’approche psychanalytique.
« Il était une fois... Jack l'Éventreur »
Authors: Drossart Francis 
Published: March 2012

À partir de l’histoire et du mythe de Jack l’Éventreur, nous essaierons de montrer que, par-delà la « libération des forces pulsionnelles » le plus souvent invoquée, le « serial killer » poursuit un véritable dessein qui n’est rien moins que de mettre au point (avec souvent de savantes et progressives améliorations) un véritable « appareil à détruire la pensée de l’autre » (attaques contre les liens, fonction anti– C au sens de Bion). Cet appareil lui permet efficacement de maintenir un semblant d’intégrité psychique qui fait de lui un être apparemment normal. De ce point de vue, de par le clivage ainsi instauré, l’auteur de meurtres en série est celui d’un véritable récit dont la fonction déstabilisatrice, quant à ceux à qui il s’adresse, est exactement inverse de celle que l’on reconnaît aux contes de fées.
Meurtres dans la nation : contribution à l'épistémologie psychanalytique
Authors: Barzin Nader 
Published: March 2012

Ayant identifié les limites de l’explication psychanalytique – de ne prendre en considération que les processus psychiques au niveau individuel et groupal – cet article appelle à une approche interdisciplinaire pour analyser les événements politiques et sociaux complexes. L’analogie entre la famille et la nation nous a permis de mettre en lumière les carences intrinsèques de l’explication psychanalytique à prendre en considération l’impact des institutions et le processus politique. Au travers des exemples de la guerre, du SIDA, des génocides et des révolutions – notamment le printemps arabe – nous avons pu affirmer cette hypothèse.
Impaired IL-17 Signaling Pathway Contributes to the Increased Collagen Expression in Scleroderma Fibroblasts
Authors: Nakashima Taiji , Jinnin Masatoshi , Yamane Keitaro , Honda Noritoshi , Kajihara Ikko , Makino Takamitsu , Masuguchi Shinichi , Fukushima Satoshi , Okamoto Yoshinobu , Hasegawa Minoru , Fujimoto Manabu , Ihn Hironobu 
Published: March 2012

AbstractAmong IL-17 families, IL-17A and IL-17F share amino acid sequence similarity and bind to IL-17R type A. IL-17 signaling is implicated in the pathogenesis of various autoimmune diseases, but its role in the regulatory mechanism of extracellular matrix expression and its contribution to the phenotype of systemic sclerosis (SSc) both remain to be elucidated. This study revealed that IL-17A expression was significantly increased in the involved skin and sera of SSc patients, whereas the IL-17F levels did not increase. In contrast, the expression of IL-17R type A in SSc fibroblasts significantly decreased in comparison with that in normal fibroblasts, due to the intrinsic TGF-β1 activation in these cell types. Moreover, IL-17A, not IL-17F, reduced the protein expression of α1(I) collagen and connective tissue growth factor. miR-129-5p, one of the downregulated microRNAs in SSc fibroblasts, increased due to IL-17A and mediated the α1(I) collagen reduction. These results suggest that IL-17A signaling, not IL-17F, has an antifibrogenic effect via the upregulation of miR-129-5p and the downregulation of connective tissue growth factor and α1(I) collagen. IL-17A signaling is suppressed due to the downregulation of the receptor by the intrinsic activation of TGF-β1 in SSc fibroblasts, which may amplify the increased collagen accumulation and fibrosis characteristic of SSc. Increased IL-17A levels in the sera and involved skin of SSc may be due to negative feedback. Clarifying the novel regulatory mechanisms of fibrosis by the cytokine network consisting of TGF-β and IL-17A may lead to a new therapeutic approach for this disease.
Protein Kinase C-θ Is Required for Murine Neutrophil Recruitment and Adhesion Strengthening under Flow
Authors: Bertram Anna , Zhang Hong , von Vietinghoff Sibylle , de Pablo Carmen , Haller Hermann , Shushakova Nelli , Ley Klaus 
Published: March 2012

Abstract
Protein kinase C (PKC)-θ is involved in T cell activation via regulating the avidity of the β2 integrin LFA-1 in the immunological synapse. LFA-1 also mediates leukocyte adhesion. To investigate the role of PKC-θ in neutrophil adhesion, we performed intravital microscopy in cremaster venules of mice reconstituted with bone marrow from LysM-GFP+ (wild-type [WT]) and PKC-θ gene-deficient (Prkcq−/−) mice. Following stimulation with CXCL1, both WT and Prkcq−/− cells became adherent. Although most WT neutrophils remained adherent for at least 180 s, 50% of Prkcq−/− neutrophils were detached after 105 s and most by 180 s. Upon CXCL1 injection, rolling of all WT neutrophils stopped for 90 s, but rolling of Prkcq−/− neutrophils started 30 s after CXCL1 stimulation. A similar neutrophil adhesion defect was seen in vitro, and spreading of Prkcq−/− neutrophils was delayed. Prkcq−/− neutrophil recruitment was impaired in fMLP-induced transmigration into the cremaster muscle, thioglycollate-induced peritonitis, and LPS-induced lung injury. We conclude that PKC-θ mediates integrin-dependent neutrophil functions and is required to sustain neutrophil adhesion in postcapillary venules in vivo. These findings suggest that the role of PKC-θ in outside–in signaling following engagement of neutrophil integrins is relevant for inflammation in vivo.
A Unique Role for ITK in Survival of Invariant NKT Cells Associated with the p53-Dependent Pathway in Mice
Authors: Qi Qian , Huang Weishan , Bai Yuting , Balmus Gabriel , Weiss Robert S. , August Avery 
Published: March 2012

Abstract
Invariant NKT (iNKT) cells play important roles in the immune response. ITK and TXK/RLK are Tec family kinases that are expressed in iNKT cells; the expression level of ITK is ∼7-fold higher than that of TXK. Itk−/− mice have reduced iNKT cell frequency and numbers, with defects in development and cytokine secretion that are exacerbated in Itk/Txk double-knockout mice. In contrast, there is no iNKT cell defect in Txk−/− mice. To determine whether ITK and TXK play distinct roles in iNKT cell development and function, we examined mice that overexpress TXK in T cells at levels similar to Itk. Overexpression of TXK rescues the maturation and cytokine secretion of Itk−/− iNKT cells, as well as altered expression of transcription factors T-bet, eomesodermin, and PLZF. In contrast, the increased apoptosis observed in Itk−/− splenic iNKT cells is not affected by TXK overexpression, likely due to the lack of effect on the elevated expression of p53 regulated proapoptotic pathways Fas, Bax, and Bad in those cells. Supporting this idea, p53−/− and Bax−/− mice have increased splenic iNKT cells. Our results suggest that TXK plays an overlapping role with ITK in iNKT cell development and function but that ITK also has a unique function in the survival of iNKT cells, likely via a p53-dependent pathway.
The E3 Ubiquitin Ligase Adaptor Ndfip1 Regulates Th17 Differentiation by Limiting the Production of Proinflammatory Cytokines
Authors: Ramon Hilda E. , Beal Allison M. , Liu Yuhong , Worthen George Scott , Oliver Paula M. 
Published: March 2012

Abstract
Ndfip1 is an adaptor for the E3 ubiquitin ligase Itch. Both Ndfip1- and Itch-deficient T cells are biased toward Th2 cytokine production. In this study, we demonstrate that lungs from Ndfip1−/− mice showed increased numbers of neutrophils and Th17 cells. This was not because Ndfip1−/− T cells are biased toward Th17 differentiation. In fact, fewer Ndfip1−/− T cells differentiated into Th17 cells in vitro due to high IL-4 production. Rather, Th17 differentiation was increased in Ndfip1−/− mice due to increased numbers of IL-6–producing eosinophils. IL-6 levels in mice that lacked both Ndfip1 and IL-4 were similar to wild-type controls, and these mice had fewer Th17 cells in their lungs. These results indicate that Th2 inflammation, such as that observed in Ndfip1−/− mice, can increase Th17 differentiation by recruiting IL-6–producing eosinophils into secondary lymphoid organs and tissues. This may explain why Th17 cells develop within an ongoing Th2 inflammatory response.
An Unusual Case of Central Venous Catheter-Related Bacteremia
Authors: Badin Julie , François Maud , Birmelé Béatrice , Turmel-Rodrigues Luc , Nivet Hubert , Pengloan Josette 
Published: March 2012

Some hemodialysed patients need definitive central venous catheterization. One of the main complications is catheter infection, and each infection must be treated. We report a case of an unusual cause of central venous catheter (CVC) infection: physical examination and catheter opacification demonstrated two pin-holes in the catheter. It was possible to salvage the catheter following a treatment regimen combining systemic antibiotics, antibiotic locks, fibrinolytics, and removal of a catheter segment.
Medicaid Managed Care and Pediatric Dental Emergency Department Visits
Authors: Baker Lawrence , Munnich Elizabeth L. , Kranz Ashley M. 
Published: June 2024

ImportanceMillions of economically disadvantaged children depend on Medicaid for dental care, with states differing in whether they deliver these benefits using fee-for-service or capitated managed care payment models. However, there is limited research examining the association between managed care and the accessibility of dental services.ObjectiveTo estimate the association between the adoption of managed care for dental services in Florida’s Medicaid program and nontraumatic dental emergency department visits and associated charges.Design, Setting, and ParticipantsThis cohort study used an event-study difference-in-differences design, leveraging Florida Medicaid’s staggered adoption of managed care to examine its association with pediatric nontraumatic dental emergency department visits and associated charges. This study included all Florida emergency department visits from 2010 to 2014 in which the patient was 17 years or younger, the patient was a Florida resident, Medicaid paid for the visit, and a primary or secondary International Classification of Diseases, Ninth Revision, code was used to classify a nontraumatic dental condition. Analyses were conducted between May 2023 and April 2024.ExposureThe county of residence transitioning Medicaid dental services from fee-for-service to a fully capitated managed care program managed by a dental plan.Main Outcomes and MeasuresThe rate of nontraumatic dental emergency department visits per 100 000 pediatric Medicaid enrollees and the associated mean charges per visit. Nontraumatic dental emergency department visits are a well-documented proxy for access to dental care. Data on emergency department visit counts came from the Florida Agency for Health Care Administration. Medicaid population denominators were derived from the American Community Survey’s 5-year estimates.ResultsAmong the 34 414 pediatric nontraumatic dental emergency department visits that met inclusion criteria across Florida’s 67 counties, the mean (SD) age of patients was 8.11 (5.28) years, and 50.8% of patients were male. Of these, 10 087 visits occurred in control counties and 24 327 in treatment counties. Control counties generally had lower rates of NTDC ED visits per 100 000 enrollees compared with treatment counties (123.5 vs 132.7). Over the first 2.5 years of implementation, the adoption of managed care was associated with an 11.3% (95% CI, 4.0%-18.4%; P = .002) increase in nontraumatic dental emergency department visits compared with pre-implementation levels. There was no evidence that the average charge per visit changed.Conclusions and RelevanceIn this cohort study, Florida Medicaid’s adoption of managed care for pediatric dental services was associated with increased emergency department visits for children, which could be associated with decreased access to dental care.