bluuebunny/crossref_metadata_2025_split huggingface dataset:
Effects of Cultivation Media on In vitro Callus Induction and Regeneration Capabilities of Pakaumpuel Rice (Oryza sativa L.), Thai Rice Landrace
Authors: TRUNJARUEN Attachai , RASO Sayam , MANEERATTANARUNGROJ Pitakpong , TARATIMA Worasitikulya 
Published: November 2020

Current study determined the effects of different cultivation media and some factors on in vitro callus induction and shoot regeneration of Pakaumpuel rice (Oryza sativa L.), the Thai rice landrace. Pakaumpuel’s dehusked seeds were surface sterilized by 20% Sodium hypoclorite for 20 mins before washed and cultured on Murashige and Skoog (MS) medium in various concentrations of BAP (0, 0.1, 0.5 and 1 mg/l) and 2,4-D (0, 1, 2 and 3 mg/l) and cultivated in off -light or dark cycle condition for 15 days. Results showed that MS medium with 2 mg/l 2,4-D incubated in light condition provided the highest callus induction percentage (80 %). For shoot regeneration, calli were desiccated by using silica gel for 0, 30, 90 and 180 minutes prior to culture on MS medium with 1 mg/l NAA and various concentrations of BAP (0, 1, 2, 3 and 4 mg/l) for 30 days. The results revealed that desiccation periods had no effect on regeneration percentage and number of shoot per callus, but had effects on shoot length and number of leaves per shoot. Therefore, MS medium with 1 mg/l NAA and 3 mg/l BAP induced the highest regeneration percentage (53.33 %) and number of shoot per callus (4.40 shoots), while the longest shoot (12.82 cm) and the highest number of leaves per shoot (3.00 leaves) were found on the culture on this medium after desiccation for 90 minutes. This discovery can be applied for micropropagation of other Thai rice landraces.
Análise de Impacto Regulatório (AIR) e participação social no Brasil
Authors: Da Silva Cristóvam José Sérgio , Sonsol Gondim Liliane , Pereira de Sousa Thanderson 
Published: November 2020

No contexto do paradigma do Estado regulador busca-se, precipuamente, determinar os traços da Análise de Impacto Regulatório (AIR) no Brasil e, nesse seguimento, identificar a participação social, suas potencialidades e desafios. No aspecto metodológico, adota-se abordagem dedutiva, com técnicas de pesquisa bibliográfica, legislativa e documental. Infere-se, da pesquisa realizada, que a AIR corresponde ao procedimento de verificação de evidências para lastrear edição ou alteração de ato normativo regulatório, caracterizando-se predominantemente pela técnica. Entretanto, é mecanismo aberto à participação social, que se corporifica na fase de elaboração do relatório de AIR e no processo de deliberação propriamente dito. Apesar dos desafios enfrentados (captura das agências e assimetria informacional), a participação social representa instrumento para a legitimação e melhoria da política regulatória, bem como conduz à adoção de um modelo regulatório responsivo.
Mathematical Laboratory: Semiotic mediation and cultural artefacts in the mathematics classroom
Authors: Bartolini Bussi Maria G. 
Published: November 2020

Aim of this presentation is to summarize the influence of Tamas Varga on the Italian research and practice concerning didactics of mathematics since the 70s of the 20th centuries. While being in Budapest for the Conference I noticed that this influence was not known by most Hungarian mathematics educators. I guess that also in Italy, only the teacher educators of my generation know Varga’s influence on the teaching and learning of mathematics in primary school. Hence I start from a brief summary of development of mathematics curriculum in Italy (mainly in primary school) in the last decades of the 20th century. I focus some elements that may be connected with Varga’s influence and, later, some recent development of them.
Subject Classification: 97G20, 97-U6, 97A40
Mapping students’ motivation in a problem oriented mathematics classroom
Authors: Báró Emőke 
Published: November 2020

This research focuses on mapping students’ motivation by implementing problem-solving activities, namely how the problem-oriented approach affects the students’ commitment, motivation, and attitude to learning. As a practicing teacher, the author faced difficulties with motivation and sought to improve her practice in the form of action research as described in this paper. Based on the literature, the author describes sources of motivation as task interest, social environment, opportunity to discover, knowing why, using objects, and helping others. The author discusses the effect of problem-oriented teaching on the motivation of 7th-grade students. In this paper, the results of two lessons are presented.
Subject Classification: 97C20, 97D40, 97D50, 97D60
Straight line or line segment?
Authors: Moravcová Vlasta , Hromadová Jana 
Published: November 2020

The article focuses on students’ understanding of the concept of a straight line. Attention is paid to whether students of various ages work with only part of a straight line shown or if they are aware that it can be extended. The presented results were obtained by a qualitative analysis of tests given to nearly 1,500 Czech students. The paper introduces the statistics of students’ solutions, and discusses the students’ thought processes. The results show that most of the tested students, even after completing upper secondary school, are not aware that a straight line can be extended. Finally, we present some recommendations for fostering the appropriate concept of a straight line in mathematics teaching.
Subject Classification: 97C30, 97D70, 97G40
Geographic variation in the skull morphology of the lesser grison (Galictis cuja: Carnivora, Mustelidae) from two Brazilian ecoregions
Authors: Migliorini Raissa Prior , Fornel Rodrigo , Kasper Carlos Benhur 
Published: November 2020

BackgroundThe lesser grison (Galictis cuja) is one of the least known carnivores in the Neotropical region. Its wide geographical occurrence and range of habitats could lead to morphological variations along its distribution. So, this study aimed to investigate the variation in skull shape and size of this species, by testing the existence of ecotypes adapted to their respective environments (Uruguayan savanna and Atlantic Forest), as well as its relationship with selected abiotic variables.MethodsThe skulls of 52 museum specimens were photographed in the ventral, dorsal, and lateral views, and were analyzed using geometric morphometric techniques.ResultsWe found sexual size dimorphism, with males being larger than females. The shape variation between sexes, as well as between ecoregions, is mostly explained by the effect of allometry. The specimens from Uruguayan savanna are larger than the ones from the Atlantic Forest. Size variation was also significantly correlated to latitude, temperature and precipitation patterns. No correlation between skull shape with geographical distance was detected.DiscussionMorphometric measurements and diet data of lesser grison in regions from higher latitudes than our sampling show a tendency to heavier individuals, and the consumption of bigger prey compared to Uruguayan savanna. The results indicated the smaller specimens associated to low variability in annual temperature, congruent to Atlantic Forest region. An explanation for observed variation may be related to the “resource rule” but, due the minimal natural history information regards this species, we can just speculate about this.
Entrepreneurial Intention of Final Year Undergraduate Students of the Faculty of Agriculture, University of Peradeniya, Sri Lanka
Authors: Madhushyanthi Shanika , Wijerathna Madhavi 
Published: November 2020

Aims: The scientific literature on Entrepreneurial Intention (EI) among agricultural university students in Sri Lanka is meager. Therefore, the focus of this study was to evaluate the EI and to understand what factors affect on EI of the final year undergraduate students of the Faculty of Agriculture, University of Peradeniya, Sri Lanka.
Study Design: The study adopted a cross-sectional survey research design. A stratified simple random sample of 100 final year undergraduates that represented 50% of each of the three degree programs of the Faculty of Agriculture, university of Peradeniya were selected for the study. The primary data was collected through a self-administered structured questionnaire.
Place and Duration of Study: Faculty of Agriculture, University of Peradeniya, Sri Lanka from October 2018 to February 2019.
Methodology: The Theory of Planned Behavior (TPB) was used to measure the EI. Thus, it examined the influence of personal attitudes, subjective norms, and perceived behavioral control factors on EI. Short-term risk taking, perceived structural support and social capital on business start-up were examined as additional variables to the theory.
Results: The results revealed that each of the TPB variables significantly (P = 0.05) affect on EI, with an overall R2 = 0.606. Attitudes were the strongest predictor of EI, followed by subjective norms and perceived behavioral control. However, overall level of EI of the students was neutral. Awareness programmes, financial support, introducing and updating the entrepreneurial subjects were some major suggestions of the respondents to improve entrepreneurship among the students.
Conclusion: Attitudes toward entrepreneurship is the strongest predictor of EI. However, overall EI of the students was neutral. Improving individual attitudes through motivational programmes, providing an approving nature of the staff towards entrepreneurship (subjective norms), mechanisms to develop entrepreneurial capabilities among students and linking entrepreneurship to the present curriculum, would be important to improve the EI of the students leading to a greater entrepreneurship.
The impact of SARS-CoV-2 on the mental health of healthcare workers in a hospital setting—A Systematic Review
Authors: Sanghera Jaspinder , Pattani Nikhil , Hashmi Yousuf , Varley Kate F , Cheruvu Manikandar Srinivas , Bradley Alex , Burke Joshua R 
Published: November 2020

Abstract

Objectives
The SARS-CoV-2 global pandemic has subjected healthcare workers (HCWs) to high risk of infection through direct workplace exposure, coupled with increased workload and psychological stress. This review aims to determine the impact of SARS-CoV-2 on mental health outcomes of hospital-based HCWs and formulate recommendations for future action.

Methods
A systematic review was performed between 31st December 2019 and 17th June 2020 through Ovid Medline and Embase databases (PROSPERO ID CRD42020181204). Studies were included for review if they investigated the impact of SARS-CoV-2 on mental health outcomes of hospital-based HCWs and used validated psychiatric scoring tools. Prevalence of ICD-10 classified psychiatric disorders was the primary outcome measure.

Results
The initial search returned 436 articles. Forty-four studies were included in final analysis, with a total of 69,499 subjects. Prevalence ranges of six mental health outcomes were identified: depression 13.5%-44.7%; anxiety 12.3%-35.6%; acute stress reaction 5.2%-32.9%; post-traumatic stress disorder 7.4%-37.4%; insomnia 33.8%-36.1%; and occupational burnout 3.1%-43.0%. Direct exposure to SARS-CoV-2 patients was the most common risk factor identified for all mental health outcomes except occupational burnout. Nurses, frontline HCWs, and HCWs with low social support and fewer years of working experience reported the worst outcomes.

Conclusion
The SARS-CoV-2 pandemic has significantly impacted the mental health of HCWs. Frontline staff demonstrate worse mental health outcomes. Hospitals should be staffed to meet service provision requirements and to mitigate the impact onmental health. This can be improved with access to rapid-response psychiatric teams and should be continually monitored throughout the pandemic and beyond its conclusion.
Workplace and community social capital and burnout among professionals of health and welfare services for the seniors: A multilevel analysis in Japan
Authors: Murayama Hiroshi , Nonaka Kumiko , Hasebe Masami , Fujiwara Yoshinori 
Published: November 2020

Abstract

Objective
Despite the potential of the social capital approach in preventing burnout, there is sparse evidence of its contextual effect. This study aimed to reveal the contextual association of workplace and community social capital on burnout among professionals of health and welfare services for seniors in Japan.

Methods
We collected data from a cross-sectional questionnaire survey for all health and welfare professionals working in Community Comprehensive Support Centers (CCSCs) in the central Tokyo area in 2015. We assessed burnout using the Japanese version of the Maslach Burnout Inventory, which consists of three subscales: emotional exhaustion, depersonalization, and reduced personal accomplishment. We prepared social capital items regarding workplace (the CCSC the participants belonged to) and community (the current catchment area of the CCSC). We aggregated individual responses of workplace and community social capital within each CCSC to create group-level workplace and community social capital indicators.

Results
Among the 1771 questionnaires distributed, we analyzed 1110 from 211 CCSCs. Multilevel analysis showed that higher group-level workplace social capital was significantly associated with lower scores of all three subscales after adjusting for covariates. Moreover, we found a significant association between greater group-level community social capital and lower scores of depersonalization and reduced personal accomplishment.

Conclusion
Working in workplaces and communities with higher social capital is related to lower burnout. The findings suggest that strategies to enhance the social capital of their workplace and community would be beneficial in the prevention of burnout among professionals in the field of health and social welfare.
From membrane to mineralization: the curious case of the ABCC6 transporter
Authors: Verschuere Shana , Van Gils Matthias , Nollet Lukas , Vanakker Olivier M. 
Published: November 2020

ATP‐binding cassette subfamily C member 6 gene/protein (ABCC6) is an ATP‐dependent transmembrane transporter predominantly expressed in the liver and the kidney. ABCC6 first came to attention in human medicine when it was discovered in 2000 that mutations in its encoding gene, ABCC6, caused the autosomal recessive multisystemic mineralization disease pseudoxanthoma elasticum (PXE). Since then, the physiological and pathological roles of ABCC6 have been the subject of intense research. In the last 20 years, significant findings have clarified ABCC6 structure as well as its physiological role in mineralization homeostasis in humans and animal models. Yet, several facets of ABCC6 biology remain currently incompletely understood, ranging from the precise nature of its substrate(s) to the increasingly complex molecular genetics. Nonetheless, advances in our understanding of pathophysiological mechanisms causing mineralization lead to several treatment options being suggested or already tested in pilot clinical trials for ABCC6 deficiency. This review highlights current knowledge of ABCC6 and the challenges ahead, particularly the attempts to translate basic science into clinical practice.
Toughened epoxy‐liquid polybutadiene networks cured with anhydride with outstanding thermal and mechanical properties
Authors: Soares Bluma Guenther , Silva Adriana A. , Lima Verônica D. , Barros Deborah N. , Livi Sebastien 
Published: November 2020

AbstractToughened epoxy systems cured with anhydride‐based hardener were successfully prepared by incorporating nonpolar liquid polybutadiene (PB) previously functionalized with isocyanate groups (PBNCO). The NCO groups in PBNCO react with the hydroxyl and/or epoxy groups of the matrix forming a ER‐PB‐ER triblock copolymer. The block copolymer is evidenced by transmission electron microscopy (TEM). In fact the modified epoxy resin (ER) networks presented domains with cocontinuous‐like morphology, composed by PB and ER phases in nanomeric dimensions. The effect of PBNCO on the curing process of ER was studied by rheometry. Also the resulting networks were characterized by mechanical and dynamic mechanical properties, differential scanning calorimetry, and TEM. By adding an amount of rubber as high as 20 phr, a great improvement of toughness (around 140%) and impact resistance as well as a good transparency were achieved without significantly affecting the modulus and stiffness. Also the glass transition temperature (Tg) increased around 10°C with the presence of 5 phr of PBNCO. Even with the addition of 20 phr of rubber, the Tg of the system was superior than that found for the neat epoxy network. The outstanding physic‐mechanical performance is attributed to the peculiar morphology.
Molecular dynamics simulation of thermal degradation of silicone grease using reactive force field
Authors: Wei Xinyu , Xu Chi , Jia Zhidong , Wang Xilin 
Published: November 2020

AbstractSilicone grease, consisting of polydimethylsiloxane (PDMS) chains and silica, has been widely used in electrical power systems; this causes thermal aging of silicone grease at high temperatures. In this study, the thermal degradation process of silicone grease was analyzed at different temperatures using reactive force field (ReaxFF). The effects of different factors, such as silica surface chemistry and oxygen content, on the final products have been studied. The results showed that the final products can be divided into two main categories: small gaseous molecules and large‐molecule products. The number of gaseous hydrocarbon products and their unsaturation increased with increasing temperature. The large‐molecule products were consisted of silica and surrounding PDMS chains, which were broken and reorganized during the thermal degradation process. The time interval required for the formation of the large‐molecule products is larger when silica with a modified surface is used. The addition of oxygen during thermal degradation provided a new decomposition route. The O/Si ratio in the residue of silica grease increased while the C/Si ratio decreased with the increasing oxygen content. A new method for the generation of SiO2 residues in a sufficient oxygen environment was proposed based on the reactions between oxygen and Si–CH3.
Superparamagnetic polyvinylpyrrolidone/chitosan/Fe3O4 electrospun nanofibers as effective U(VI) adsorbents
Authors: Philippou Katerina , Christou Christos N. , Socoliuc Vlad , Vekas Ladislau , Tanasă Eugenia , Miclau Marinela , Pashalidis Ioannis , Krasia‐Christoforou Theodora 
Published: November 2020

AbstractMagnetoactive electrospun fibrous membranes consisting of polyvinylpyrrolidone (PVP), chitosan (CS) and pre‐fabricated, double‐layer oleic acid‐coated magnetite nanoparticles (OA.OA.Fe3O4) were fabricated and evaluated as new adsorbent materials for the removal and recovery of uranium (U(VI)) from aqueous solutions. The adsorption has been investigated by batch‐type experiments and the solid material has been characterized by X‐ray diffraction spectroscopy (XRD), Fourier‐transform infrared spectroscopy (FTIR), scanning electron microscopy (SEM), transmission electron microscopy/energy dispersive X‐ray analysis (TEM/EDX) and vibration sample magnetometry (VSM) measurements prior and after uranium adsorption. The experimental adsorption data were found to be well fitted with the Langmuir isotherm and the pseudo‐second order kinetic model. The results indicate that PVP/CS/OA.OA.Fe3O4 fibrous adsorbents exhibit good adsorption properties towards U(VI) in aqueous solutions, achieving a qmax value of 0.77 mol kg−1 (183.3 mg g−1) at pH 6.0. The experiments regarding the regeneration and reuse of the magnetoactive adsorbents were carried out using Na2CO3, at pH ~11. After four cycles, the percentage relative adsorption remained stable (~100%) whereas the desorption percentage decreased from 31.9% to 21.0%. Generally, the presented results demonstrate that the incorporation of the Fe3O4 NPs has a positive effect on the adsorption efficiency of U(VI) from aquatic environments.
Large‐Scale Characterization of Systemic Sclerosis Serum Protein Profile: Comparison to Peripheral Blood Cell Transcriptome and Correlations With Skin/Lung Fibrosis
Authors: Bellocchi Chiara , Ying Jun , Goldmuntz Ellen A. , Keyes‐Elstein Lynette , Varga John , Hinchcliff Monique E. , Lyons Marka A. , McSweeney Peter , Furst Daniel E. , Nash Richard , Crofford Leslie J. , Welch Beverly , Goldin Jonathan G. , Pinckney Ashley , Mayes Maureen D. , Sullivan Keith M. , Assassi Shervin 
Published: November 2020

ObjectiveTo provide a large‐scale assessment of serum protein dysregulation in diffuse cutaneous systemic sclerosis (dcSSc) and to investigate serum protein correlates of SSc fibrotic features.MethodsWe investigated serum protein profiles of 66 participants with dcSSc at baseline who were enrolled in the Scleroderma: Cyclophosphamide or Transplant Trial and 66 age‐ and sex‐matched healthy control subjects. A panel of 230 proteins, including several cytokines and chemokines, was investigated. Whole blood gene expression profiling in concomitantly collected samples was performed.ResultsAmong the participants with dcSSc, the mean disease duration was 2.3 years. All had interstitial lung disease (ILD), and none were being treated with immunosuppressive agents at baseline. Ninety proteins were differentially expressed in participants with dcSSc compared to healthy control subjects. Similar to previous global skin transcript results, hepatic fibrosis, granulocyte and agranulocyte adhesion, and diapedesis were the top overrepresented pathways. Eighteen proteins correlated with the modified Rodnan skin thickness score (MRSS). Soluble epidermal growth factor receptor was significantly down‐regulated in dcSSc and showed the strongest negative correlation with the MRSS, being predictive of the score’s course over time, whereas α1‐antichymotrypsin was significantly up‐regulated in dcSSc and showed the strongest positive correlation with the MRSS. Furthermore, higher levels of cancer antigen 15‐3 correlated with more severe ILD, based on findings of reduced forced vital capacity and higher scores of disease activity on high‐resolution computed tomography. Only 14 genes showed significant differential expression in the same direction in serum protein and whole blood RNA gene expression analyses.ConclusionDiffuse cutaneous SSc has a distinct serum protein profile with prominent dysregulation of proteins related to fibrosis and immune cell adhesion/diapedesis. The differential expression for most serum proteins in SSc is likely to originate outside the peripheral blood cells.