bluuebunny/crossref_metadata_2025 huggingface dataset:
Analytical performances of a chemiluminescence immunoassay for SARS-CoV-2 IgM/IgG and antibody kinetics
Authors: Padoan Andrea , Cosma Chiara , Sciacovelli Laura , Faggian Diego , Plebani Mario
Published: April 2020

Background

Coronavirus disease 2019, abbreviated to COVID-19, represents an emerging health threat worldwide as, after initial reports in China, it has continued to spread rapidly. The clinical spectrum of the disease varies from mild to severe acute respiratory distress syndrome (ARDS). Moreover, many patients can be asymptomatic, thus increasing the uncertainty of the diagnostic work-up. Laboratory tests play a pivotal role in the diagnosis and management of COVID-19, the current gold standard being real-time reverse transcription polymerase chain reaction (rRT-PCR) on respiratory tract specimens. However, the diagnostic accuracy of rRT-PCR depends on many pre-analytical and analytical variables. The measurement of specific COVID-19 antibodies (both IgG and IgM) should serve as an additional, non-invasive tool for disease detection and management.

Methods

The imprecision of the MAGLUMI™ 2000 Plus 2019-nCov IgM and IgG assays (Snibe, Shenzhen, China) was assessed by adopting the Clinical and Laboratory Standards Institute (CLSI) EP15-A3 protocol. Linearity of dilution and recovery was evaluated by means of mixes of high-level pools and low-level pools of serum samples. Immunoglobulin time kinetics were evaluated using a series of serum samples, repeatedly collected from COVID-19-positive patients at different times, from <5 days up to 26–30 days.

Results

Findings at the analytical validation of the assay carried out according to the CLSI EP15-A3 guideline demonstrated that imprecision and repeatability were acceptable (repeatability was <4% and <6% for IgM and IgG, respectively, whilst intermediate imprecision was <6%). In addition, results of dilution and recovery studies were satisfactory. The kinetics of COVID-19 antibodies confirmed previously reported findings, showing a rapid increase of both IgM and IgG after 6–7 days from the symptom onset. IgG had 100% sensitivity on day 12, whilst 88% was the higher positive rate achieved for IgM after the same time interval.

Conclusions

The findings of this study demonstrate the validity of the MAGLUMI 2000 Plus CLIA assay for the measurement of specific IgM and IgG in sera of COVID-19 patients, and for obtaining valuable data on the kinetics of both (IgM and IgG) COVID-19 antibodies. These data represent a pre-requisite for the appropriate utilization of specific antibodies for the diagnosis and management of COVID-19 patients.
Checkerboard copula defined by sums of random variables
Authors: Kuzmenko Viktor , Salam Romel , Uryasev Stan
Published: April 2020

We consider the problem of finding checkerboard copulas for modeling multivariate distributions. A checkerboard copula is a distribution with a corresponding density defined almost everywhere by a step function on an m-uniform subdivision of the unit hyper-cube. We develop optimization procedures for finding copulas defined by multiply-stochastic matrices matching available information. Two types of information are used for building copulas: 1) Spearman Rho rank correlation coefficients; 2) Empirical distributions of sums of random variables combined with empirical marginal probability distributions. To construct checkerboard copulas we solved optimization problems. The first problem maximizes entropy with constraints on Spearman Rho coefficients. The second problem minimizes some error function to match available data. We conducted a case study illustrating the application of the developed methodology using property and casualty insurance data. The optimization problems were numerically solved with the AORDA Portfolio Safeguard (PSG) package, which has precoded entropy and error functions. Case study data, codes, and results are posted at the web.
Resistance Mechanisms ofSaccharomyces cerevisiaeto Commercial Formulations of Glyphosate Involve DNA Damage Repair, the Cell Cycle, and the Cell Wall Structure
Authors: Ravishankar Apoorva , Pupo Amaury , Gallagher Jennifer E G
Published: April 2020

The use of glyphosate-based herbicides is widespread and despite their extensive use, their effects are yet to be deciphered completely. The additives in commercial formulations of glyphosate, though labeled inert when used individually, have adverse effects when used in combination with other additives along with the active ingredient. As a species, Saccharomyces cerevisiae has a wide range of resistance to glyphosate-based herbicides. To investigate the underlying genetic differences between sensitive and resistant strains, global changes in gene expression were measured, when yeast were exposed to a glyphosate-based herbicide (GBH). Expression of genes involved in numerous pathways crucial to the cell’s functioning, such as DNA replication, MAPK signaling, meiosis, and cell wall synthesis changed. Because so many diverse pathways were affected, these strains were then subjected to in-lab-evolutions (ILE) to select mutations that confer increased resistance. Common fragile sites were found to play a role in adaptation to resistance to long-term exposure of GBHs. Copy number increased in approximately 100 genes associated with cell wall proteins, mitochondria, and sterol transport. Taking ILE and transcriptomic data into account it is evident that GBHs affect multiple biological processes in the cell. One such component is the cell wall structure which acts as a protective barrier in alleviating the stress caused by exposure to inert additives in GBHs. Sed1, a GPI-cell wall protein, plays an important role in tolerance of a GBH. Hence, a detailed study of the changes occurring at the genome and transcriptome levels is essential to better understand the effects of an environmental stressor such as a GBH, on the cell as a whole.
Genetic Selection Based on a Ste6*C-HA-Ura3 Substrate Identifies New Cytosolic Quality Control Alleles in Saccharomyces cerevisiae
Authors: Chan Shu Ning , Prasad Rupali , Matsudaira Paul
Published: April 2020

Protein quality control in the cytosol (CytoQC) is an important cellular pathway consisting of a network of components which monitor the folding of cytosolic proteins and ensure the efficient removal of aberrant ones. Our understanding of CytoQC mechanisms is limited in part by the ability of current approaches to identify new genes in the pathway. In this study, we developed a CytoQC reporter substrate, Ste6*C-HA-Ura3, for a new genetic selection of spontaneous CytoQC mutations in the yeast Saccharomyces cerevisiae. In addition to UBR1, which encodes for a known CytoQC E3 ligase, we identified six new CytoQC candidates. In the preliminary characterization of two mutants, we found that Doa4 is involved in the degradation of misfolded substrates while Pup2 functions in the selectivity of CytoQC and ERAD substrates. Overall, the strategy demonstrates the potential to identify novel genes and advance our understanding of CytoQC.
The Yeast Hsp70 Cochaperone Ydj1 Regulates Functional Distinction of Ssa Hsp70s in the Hsp90 Chaperoning Pathway
Authors: Gaur Deepika , Singh Prashant , Guleria Jyoti , Gupta Arpit , Kaur Satinderdeep , Sharma Deepak
Published: April 2020

Heat-shock protein (Hsp) 90 assists in the folding of diverse sets of client proteins including kinases and growth hormone receptors. Hsp70 plays a major role in many Hsp90 functions by interacting and modulating conformation of its substrates before being transferred to Hsp90s for final maturation. Each eukaryote contains multiple members of the Hsp70 family. However, the role of different Hsp70 isoforms in Hsp90 chaperoning actions remains unknown. Using v-Src as an Hsp90 substrate, we examined the role of each of the four yeast cytosolic Ssa Hsp70s in regulating Hsp90 functions. We show that the strain expressing stress-inducible Ssa3 or Ssa4, and the not constitutively expressed Ssa1 or Ssa2, as the sole Ssa Hsp70 isoform reduces v-Src-mediated growth defects. The study shows that although different Hsp70 isoforms interact similarly with Hsp90s, v-Src maturation is less efficient in strains expressing Ssa4 as the sole Hsp70. We further show that the functional distinction between Ssa2 and Ssa4 is regulated by its C-terminal domain. Further studies reveal that Ydj1, which is known to assist substrate transfer to Hsp70s, interacts relatively weakly with Ssa4 compared with Ssa2, which could be the basis for poor maturation of the Hsp90 client in cells expressing stress-inducible Ssa4 as the sole Ssa Hsp70. The study thus reveals a novel role of Ydj1 in determining the functional distinction among Hsp70 isoforms with respect to the Hsp90 chaperoning action.
Peanut Allergy: New Advances and Ongoing Controversies
Authors: Abrams Elissa M. , Chan Edmond S. , Sicherer Scott
Published: April 2020

Peanut allergy is one of the most common food allergies in children, with increasing prevalence over time. The dual-allergen exposure hypothesis now supports transcutaneous sensitization to peanut as a likely pathophysiologic mechanism for peanut allergy development. As a result, there is emerging evidence that early peanut introduction has a role in peanut allergy prevention. Current first-line diagnostic tests for peanut allergy have limited specificity, which may be enhanced with emerging tools such as component-resolved diagnostics. Although management of peanut allergy includes avoidance and carrying an epinephrine autoinjector, risk of fatal anaphylaxis is extremely low, and there is minimal risk related to cutaneous or inhalational exposure. Quality of life in children with peanut allergy requires significant focus. Moving forward, oral and epicutaneous immunotherapy are emerging and exciting tools that may have a role to play in desensitization to peanut.
Chromatographic fingerprinting and quantitative analysis for the quality evaluation of Xinfeng capsule
Authors: Gao Leilei , Wang Fang , Meng Mei
Published: April 2020

A simple, accurate and sensitive method of high performance liquid chromatography (HPLC) with diode array detector was established to identify Xinfeng capsules and systematically evaluated its quality, based on chromatographic fingerprint integrated with the similarity analysis, hierarchical cluster analysis and the quantitative analysis of multi-components by single marker (QAMS). In this study, 18 peaks were selected as the common peaks to evaluate the similarities among different batches (S1–S10) of Xinfeng capsules samples, which were manufactured in the First Affiliated Hospital of Anhui University of Chinese Medicine with a three-year span. Compared to control fingerprint, the similarities values for 10 batches of samples were more than 0.90. Moreover, by analyzing the reference of astragalus, the chromatogram of astragalus was developed, and 10 common peaks of astragalus were identified. More importantly, simultaneous quantification of three markers in Xinfeng capsule, including Calycosin-7-glucoside, calycosin and Formononetinaldehyde was performed, the three constituents showed good regression (R > 0.999) within linear ranges, and their recoveries were within the range of 97.6–101.5%. The validation results showed that the developed method was specific, accurate, precise and robust. This study demonstrated that the developed method offers an efficient, reliable and practical approach for systematic quality evaluation of Xinfeng capsule.
Spontaneous Retroperitoneal Hemorrhage in a Patient with Acquired Cystic Kidney Disease
Authors: Kotb Ahmed , Ismail Asmaa , Elmansy Hazem , Prowse Owen , Shahrour Walid
Published: April 2020

Spontaneous retroperitoneal hemorrhage (SRH) is a rare emergency. It is usually encountered in patients on hemodialysis and is associated with high rate of morbidity and mortality. This is a case from the emergency department. The patient had unstable vitals with SRH following dialysis. Immediate exploration and nephrectomy using transverse lateral lumbotomy incision were done. Patients on hemodialysis are at a risk of SRH and frequent surveillance is recommended. Acquired cystic kidney disease (ACKD) can develop in hemodialysis patients and put them at risk for bleeding. Transverse lateral lumbotomy may be a safe option for direct access to the kidney in emergency kidney surgery
Influence of charge conditions on battery dynamics of a commercial lithium-ion cell
Authors: MORALI Uğur
Published: April 2020

Electrochemical impedance spectroscopy measurements were performed to determine the effect of the state-of-charge, charge current, and current-drop time on battery dynamics of a commercial 2032 lithium-ion coin cell. The impedance response was systematically investigated and discussed by using the Taguchi design. The results showed that the state-of-charge had a statistically significant effect on both the resistance for solid electrolyte interphase formation and cathodic charge transfer resistance. It was showed that the Taguchi design is a valuable tool for analyzing battery dynamics obtained through the equivalent circuit model. The Taguchi design opened the door for a robust design of lithium-ion batteries in real life.
O rizoma deleuze-guattariano nas pesquisas em Estudos Organizacionais
Authors: BARRETO RAQUEL DE OLIVEIRA , CARRIERI ALEXANDRE DE PÁDUA , ROMAGNOLI ROBERTA CARVALHO
Published: April 2020

Resumo Neste ensaio, objetivamos discutir sobre a utilização do conceito de rizoma, desenvolvido por Deleuze e Guattari, no âmbito da pesquisa em Estudos Organizacionais. Trata-se de uma imagem-pensamento que se opõe à forma tradicional de pensar e conhecer baseada em uma perspectiva arborescente, organizada e centralizada. Dessa imagem-pensamento rizomática proposta pelos autores provém um entendimento da vida de uma forma mais ampla, considerando a complexidade e a processualidade que lhe são inerentes. Partindo de uma breve introdução à filosofia dos autores e, especificamente, ao conceito de rizoma, arriscamo-nos a propor formas de utilização desse conceito nas pesquisas em Estudos Organizacionais, a saber: como uma perspectiva rizomática e como operador metodológico. Enquanto a primeira proposta refere-se basicamente à postura do pesquisador frente à construção da pesquisa, a segunda remete a uma lente capaz de aumentar o grau de inteligibilidade sobre os objetos de investigação. Concluímos que as contribuições filosóficas de Deleuze e Guattari podem revelar-se extremamente produtivas quando pensamos na pesquisa nesse campo de estudo, em especial no que tange às investigações empíricas, por sustentar a complexidade e a processualidade também no que diz respeito à produção de conhecimento.
Estratégias políticas empresariais: o caso do setor ferroviário brasileiro de cargas
Authors: SILVA RODRIGO OLIVEIRA DA , MACEDO-SOARES TERESIA DIANA LEWE VAN ADUARD DE , BASTOS SÉRGIO AUGUSTO PEREIRA
Published: April 2020

Resumo O propósito desta pesquisa foi, por meio de estudo de casos múltiplos, identificar as estratégias políticas empresariais empregadas por 4 concessionárias ferroviárias de cargas brasileiras em 2 casos de mudança regulatória e em 1 caso de pedido de prorrogação de contratos de concessão. O tema vem ganhando notoriedade em função dos escândalos de corrupção na relação entre atores políticos e econômicos, públicos e privados, no Brasil. Foram conduzidas 33 entrevistas, tanto com gestores das concessionárias quanto com representantes de associações de defesa de interesses, do órgão regulador, do poder legislativo e de especialistas no setor. As evidências apontam que os comportamentos estratégicos analisados não se enquadram em uma única tipologia de estratégia genérica encontrada na literatura. No entanto, de modo geral, há uma tendência à postura reativa nos casos de mudança regulatória, em contraste com uma postura proativa quanto à alteração dos prazos dos contratos de concessão.
The rationality of decisions in the university professors’ inter-professional transitions
Authors: VELOSO ELZA FÁTIMA ROSA , DUTRA JOEL SOUZA , SILVA RODRIGO CUNHA DA , TREVISAN LEONARDO NELMI
Published: April 2020

Resumo O estudo apresentado neste artigo teve como objetivo analisar a racionalidade das decisões tomadas por professores universitários, em sua transição de outras profissões para a carreira docente. Foram analisados 357 respondentes, que consideram ter mudado de profissão na época em que decidiram seguir a carreira de docentes de nível superior. Quatro hipóteses foram avaliadas, relacionando a influência da profissão anterior, dos impulsionadores da transição, dos atributos da transição e dos recursos acionados pelo indivíduo sobre a racionalidade de suas decisões. Os resultados mostraram que os atributos e os recursos influenciam tanto as decisões racionais como as que extrapolam a racionalidade; a menor carga de trabalho na profissão atual permite que a pessoa identifique mais positivamente os atributos da transição que viveu; a percepção da incerteza na profissão anterior leva a decisões mais emocionais e mais sujeitas a variações contextuais. De forma geral, embora os estudos atuais considerem fortemente a emoção no processo decisório, para evitar frustrações futuras, é importante equilibrar a racionalidade e a subjetividade nas decisões de carreira.
Reason and Sentiment in Normative Disputes
Authors: Cardoso de Oliveira Luís R.
Published: April 2020

Abstract In the last fifty years, anthropology has engaged in intense debates about the rational grounds upon which ethnographic understanding rests. Whatever the particular stand taken by the respective interlocutors in these debates, the main reference shared by all interventions is the symbolic character of anthropological data and understanding. If that is so for any ethnographic context, the importance of focusing on the symbolic pre-structure of the lifeworld is even more significant when we look at normative disputes. This is because differently than assertoric statements about facts in the world, the meanings of norms exist prior to the research interests of the interpreter and lie first and foremost in the world views of the subjects who share them. My research about dispute resolution has shown that reason and sentiment often become entangled in these processes and their proper articulation is a condition for making the respective conflicts intelligible.
Traditional peoples and communities in Brazil: the work of the anthropologist, political regression and the threat to rights
Authors: Costa Filho Aderval
Published: April 2020

Abstract The article problematizes the questions of identities and territories, and the forms of resilience in contemporary Brazil, based on the correlation between power, territoriality, State and development, emphasizing situations of vulnerability of indigenous peoples, quilombos, peoples and traditional communities, as well as their fights for recognition, access to land/territory and other rights. The developmentalist perspective adopted by the Brazilian State has resulted in a series of impacts on territories and ways of life, resulting in deficits of citizenship for various historically excluded groups. This situation has worsened over the last few years with a political setting of demographic regression (revocation of legal frameworks, dissolution of social oversight bodies, dismantling of State apparatuses, cancelation of social programs, budget cuts), in line with hegemonic interests and projects. The article also problematizes the work of the anthropologist in the processes of recognizing collective and territorial rights, in dialogue with the judicial field, the federal government and social movements.
Anthropological practices, inter-group conflicts and shared colonial experiences in a regional context of the Lower Amazon
Authors: O’Dwyer Eliane Cantarino , Silva Katiane
Published: April 2020

Abstract The purpose of this paper is to present new reflections on ethnographic research conducted in the Lower Amazon, in social situations investigated under fieldwork conditions over two and a half decades. During this period, nation-building developmental projects promoted by capitalist enterprises and the modernising state, regarded as the two most important powers that organise space today, have been implemented. In this context of hegemonic developmental policies, narratives related to territorial and cultural rights are produced, which equally count on the contribution of anthropologists through academic research and the elaboration of legal and administrative reports in Brazil as new narrative genres.
Mathematics Conceptions by Teachers from an Ethnomathematical Perspective
Authors: Albanese Veronica , Perales Francisco Javier
Published: April 2020

Abstract The ethnomathematical perspective implies substantial epistemological changes in mathematics conception with respect to the positivist tradition. This research focuses on a workshop for pre-service teachers, designed and developed under the ethnomathematical perspective, and which promotes reflection on the nature of mathematical knowledge. To that end, we analyzed the teachers’ answers about the nature of the mathematics described after the participation in this workshop. First, we identified some characteristic approaches of mathematics from the ethnomathematical perspective - the practical, social, and cultural approaches - and then used them to analyze the participants’ observations, which are considered as evidence of their conceptions about the nature of mathematical knowledge. Later, we grouped participants in profiles defined in relation to the incorporation of mathematics approaches according to Ethnomathematics. In conclusion, the workshop is shown as an environment conducive to reflection.
Los Gráficos Estadísticos en los Libros de Texto de Educación Primaria en Costa Rica
Authors: Jiménez-Castro Maynor , Arteaga Pedro , Batanero Carmen
Published: April 2020

Resumen El objetivo del trabajo fue analizar los gráficos estadísticos incorporados en las dos series de libros de texto utilizadas con más frecuencia en la educación primaria en Costa Rica. Se analizan el tipo de gráfico, su complejidad semiótica y el contexto de donde se toman los datos, así como el tipo de tarea planteada, el nivel de lectura requerido y el propósito del gráfico dentro de la tarea. Se observa la predominancia del gráfico de barras, el tercer nivel de complejidad semiótica (representar una distribución), segundo nivel de lectura (leer entre los datos), contexto laboral y escolar, tareas de lectura y cálculo y propósito de análisis. Se describen las diferencias en función del grado y entre las dos editoriales, destacando las coincidencias y diferencias con resultados de otros estudios sobre la presentación de los gráficos estadísticos en los libros de texto en España y Chile.
É Possível Ensinar Estocástica para Crianças da Educação Infantil? Uma Análise à Luz da Teoria de Bruner
Authors: Dias Cristiane de Fátima Budek , Pereira Caroline Subirá , Dias Juliane Budek , dos Santos Junior Guataçara , Pinheiro Nilcéia Aparecida Maciel , Miquelin Awdry Feisser
Published: April 2020

Resumo Conceitos estocásticos são considerados complexos para serem ensinados para crianças, porém são importantes para a atuação cotidiana e demandam tempo para o desenvolvimento. Neste sentido, este artigo tem como objetivo analisar as contribuições de uma prítica pedagógica, desenvolvida para ensinar Estocística, a crianças da Educação Infantil, à luz da teoria de ensino de Bruner. A prítica foi aplicada em duas turmas de Educação Infantil, compreendendo a faixa etária de 3 a 5 anos. Os dados foram coletados por meio de gravações de vídeo, registros fotogríficos e de narrativa da professora das turmas. Para a anílise, optou-se pela metodologia da Anílise Textual Discursiva. Os resultados sugerem que a prítica contribuiu para o avanço no desenvolvimento intelectual das crianças, possibilitou a aprendizagem por descoberta, atendeu a todas as crianças e auxiliou na formação de conceitos estocásticos.
Formas de colaboración humana entre profesores y alumnos durante la elaboración de simuladores con GeoGebra
Authors: Prieto G. Juan Luis , Castillo B. Luis Andrés , Márquez T. Maximina
Published: April 2020

Resumen La investigación se centra en las formas de colaboración humana puestas de manfiesto por profesores y alumnos de educación media que participan en una experiencia de elaboración de simuladores con GeoGebra (ESG) en la que intervienen procesos de modelación matemática. Para analizar la colaboración en esta actividad nos apoyamos en la idea de subjetividad proveniente de la Teoría de la Objetivación (RADFORD, 2014). A través de un análisis interpretativo del momento en que un alumno comunica a otros la técnica empleada por él para construir un semicírculo con GeoGebra, fue posible identificar la presencia de la responsabilidad, el compromiso y el cuidado del otro, como las tres formas de colaboración características de la ESG. Además, el análisis permitió identificar el modo en que uno de los profesores promueve algunas de estas formas de colaboración en los alumnos. Las conclusiones sugieren que la manera de gestionar la comunicación de la técnica, la cultura individualista en la escuela y la resistencia al cambio por parte de los alumnos, fueron los tres aspectos que incidieron en la manifestación y promoción de estas formas de colaboración.
Interface Entre a Velocidade de Processamento Cognitivo e o Desempenho Aritmético e Leitor de Alunos do 5° e 7° Anos do Ensino Fundamental
Authors: Corso Luciana Vellinho , Assis Évelin Fulginiti de
Published: April 2020

Resumo A literatura que investiga a interface entre a velocidade de processamento cognitivo (VP) e as aprendizagens da Matemática e da leitura sugere que a VP exerce um papel crucial. Entretanto, resultados ainda controversos têm caracterizado este campo de investigaçâo e, portanto, faz-se necessária a busca de maior entendimento sobre as associações entre a VP e o desempenho acadêmico, assim como as relações entre a VP e a memória de trabalho (MT), outro domínio cognitivo de base. Para contribuir com este debate, o presente estudo buscou verificar a ocorrência de correlaçâo (Spearman) entre a VP e as seguintes variáveis: a) desempenho em competência numérica (aritmética e senso numérico); b) desempenho em leitura; c) memória de trabalho (componente executivo central); d) frequência no uso da estratégia de recuperaçâo da memória; e) número de acertos com a estratégia de recuperaçâo da memória. A pesquisa compreendeu 60 alunos, de 5° e 7° anos, com desempenho médio e baixo na aritmética e na leitura. Os resultados evidenciaram associações significativas e negativas (menor tempo=maior velocidade) entre as variáveis, de modo que a VP está associada tanto com a competência numérica, quanto leitora, assim como com a MT e com as variáveis relacionadas à estratégia de recuperaçâo de fatos básicos da memória. Tais dados indicam que uma fragilidade na VP pode tornar-se um fator de risco para o desenvolvimento de dificuldades naquelas áreas. Destacam-se algumas implicações educacionais e também a necessidade de mais evidência, relacionando as intervenções em VP e MT e o desempenho aritmético e leitor.
Diseño de un instrumento para valorar la comprensión alcanzada en divisibilidad por futuros profesores de matemática
Authors: Espinoza Ricardo Fabián , Pochulu Marcel David
Published: April 2020

Resumen La investigación que se presenta en este artículo, tuvo por objetivo valorar la comprensión que han alcanzado futuros profesores de matemática sobre objetos matemáticos de la divisibilidad. Para tal fin, se diseñó y validó un instrumento de indagación, el que se constituye en un insumo valioso para revisar no sólo las prácticas que llevan a cabo los futuros profesores de matemática, sino también, para explorar y potenciar la faceta del conocimiento epistémico sobre la divisibilidad en los formadores de profesores. La resolución de cada situación problema que compone el instrumento deja al descubierto funciones semióticas actuativas y argumentativas, y una amplia red de relaciones conceptuales involucradas entre objetos matemáticos primarios, lo que hace posible valorar la comprensión lograda de la divisibilidad.
Perspectivas de Professores de Matemática sobre o Humor e o seu Valor Educacional
Authors: Menezes Luís , Fernandes José António , Viseu Floriano , Ribeiro António , Flores Pablo
Published: April 2020

Resumo O humor tem uma aceitação crescente, por se lhe reconhecer contributos positivos para o bem-estar das pessoas, em contextos como a saúde e as empresas. O que acontece na Educação, em particular, no ensino da Matemática? Na procura desta resposta, desenhamos este estudo, de natureza quantitativa, com uma amostra de 1088 professores de Matemática (portugueses e espanhóis). Com recurso a inquérito, averigua se professores que ensinam Matemática, ao longo dos diversos níveis de ensino, apreciam o humor, que perspectiva têm dele e do seu valor educativo e se o utilizam no ensino. O estudo averigua, ainda, se o nível de ensino em que lecionam tem influência na perceção e uso do humor com fins instrucionais. O estudo procura verificar se há diferenças significativas entre os professores portugueses e espanhóis em relação a estes aspectos. Os resultados revelam que a maioria dos professores, de todos os níveis de ensino, reconhecem o significado de humor, consideram que têm sentido de humor, justificam o seu uso no ensino da Matemática e já o viram utilizar ou utilizam nas aulas, com o objetivo de criar bom ambiente de aprendizagem e de fazer pensar os alunos. O estudo revela diferenças entre os professores dos diversos níveis de ensino, indicando que existe maior predisposição dos professores dos Anos Iniciais, comparativamente com os demais, para valorizar e utilizar o humor no ensino. O estudo revela também diferenças entre professores portugueses e espanhóis, sendo os portugueses a apresentarem uma média de concordância superior na generalidade dos itens.
Flora do Ceará, Brasil: Symplocaceae
Authors: Rebouças Natanael Costa , Lima Igor Gonçalves , Cordeiro Luciana Silva , Ribeiro Rayane de Tasso Moreira , Loiola Maria Iracema Bezerra
Published: April 2020

Resumo Apresentamos o levantamento florístico-taxônomico das espécies de Symplocaceae para o estado do Ceará, como parte do projeto “Flora do Ceará: conhecer para conservar”. O estudo foi baseado na análise comparativa dos caracteres morfológicos de espécimes depositados nos Herbários ALCB, EAC, HUVA, IPA, R e UPCB, bibliografias especializadas e imagens de coleções-tipo. Para o estado foram registradas três espécies de Symplocos: S. guianensis, S. nitens e, possivelmente, S. oblongifolia. No entanto, por falta de material reprodutivo não foi confirmada a identificação do último táxon. As espécies ocorrem em vegetação de Floresta Ombrófila Densa e Savana. Symplocos nitens é uma nova ocorrência para o Ceará e foi registrada em duas Unidades de Conservação no estado.
Dunes in the North coast of Sergipe, Brazil: plant species and their ecological traits
Authors: Oliveira Eduardo Vinícius da Silva , Landim Myrna Friederichs
Published: April 2020

Abstract Restinga vegetation, which is a vegetation type of coastal zones, are present in two geomorphological features in the North coast of Sergipe state - Brazil: litoraneous dunes (LD) and continental dunes (CD). The objective of the present paper is to record the species composition, Raunkiaer’s life forms, dispersal syndromes and soil fertility differences between both habitats. Furthermore, we compared the life forms spectra of the studied features to the spectra of the main Brazilian phytogeographic domains. We conducted a floristic survey from November 2013 to May 2014 in different Restinga areas in two dune habitats in coastal Sergipe state, Brazil, and compared differences in the two localities. Although the two areas were geographically close, there was low floristic similarity between the two habitats; CD showed higher richness than LD. The spectrum of life forms was more similar to that of Caatinga, probably due to environmental similarities. Life forms and dispersal syndromes proportions significantly differed between features, as well as the pH, organic matter, phosphorus, sodium and base saturation index. Zoochory prevailed in both features, whereas phanerophytes prevailed in CD and chamaephytes and phanerophytes in LD. Despite the influence of historical processes, micro-environmental differences between features, which were amplified by their different distances from the sea, were assumingly responsible for the recorded differences.
Fabaceae em um afloramento rochoso no Semiárido brasileiro
Authors: Rodrigues Erimágna de Morais , Queiroz Rubens Teixeira de , Silva Luan Pedro da , Monteiro Fernanda Kalina da Silva , Melo José Iranildo Miranda de
Published: April 2020

Resumo Este trabalho consiste no levantamento florístico-taxonômico de Fabaceae em um afloramento rochoso situado no Semiárido paraibano, Nordeste brasileiro. Foram registradas 28 espécies em 22 gêneros e três subfamílias: Caesalpinioideae (12 spp.), Detarioideae (1 spp.) e Papilionoideae (15 spp.). As espécies Ancistrotropis peduncularis, Crotalaria pallida e Mimosa acutistipula consistem em novos registros para a flora da Paraíba. Foram produzidas chaves dicotômicas para as subfamílias e respectivas espécies, descrições para gêneros e espécies, comentários taxonômicos, dados de distribuição geográfica, ambientes, floração, frutificação e imagens das espécies encontradas durante esse estudo.
Verbenaceae no Parque Nacional da Serra da Canastra, Minas Gerais, Brasil
Authors: Cardoso Pedro Henrique , Cabral Andressa , Santos-Silva Fernanda , Salimena Fátima Regina Gonçalves
Published: April 2020

Resumo Apresenta-se um tratamento florístico de Verbenaceae no Parque Nacional da Serra da Canastra, localizado no sudoeste do estado de Minas Gerais, com vegetação representada predominantemente pelos cerrados e campos rupestres. No total, foram registrados oito táxons pertencentes a três gêneros: Lippia filifolia, L. lupulina, L. nana, L. rotundifolia, L. sericea, Petrea volubilis, Stachytarpheta longispicata subsp. brevibracteata e Stachytarpheta sp., que possivelmente trata-se de uma nova espécie. Para reconhecimento dos táxons são apresentadas descrições, chave de identificação, fotografias, comentários taxonômicos e de distribuição geográfica.
Flora da Mata do Buraquinho, João Pessoa, Paraíba: Orchidaceae
Authors: Moreira Luiz Henrique Liberato , Soares Neto Raimundo Luciano , Barbosa Maria Regina de Vasconcellos
Published: April 2020

Resumo A Mata do Buraquinho, situada no município de João Pessoa, com aproximadamente 520 ha, é um dos principais remanescentes de Floresta Atlântica no estado da Paraíba. Este trabalho teve como objetivo inventariar e descrever as espécies de Orchidaceae presentes nesta mata, visando fornecer informações sobre a riqueza e formas de vida da família predominantes nesse ambiente. Para o levantamento das espécies foram realizadas caminhadas por trilhas já existentes, observadas as populações in situ e coletadas aquelas em estágio reprodutivo, além da consulta de espécimes herborizados. O levantamento revelou a presença de 11 espécies reunidas em oito gêneros. O gênero mais diverso foi Vanilla com três espécies. Epidendrum micronocturnum, espécie disjunta amazônico-atlântica, é um novo registro para o estado da Paraíba. É apresentada uma chave para identificação das espécies, bem como descrições, ilustrações e comentários a respeito das mesmas.
A constituição da subjetividade na criança com diagnóstico de Transtorno de Déficit de Atenção e Hiperatividade
Authors: Signor Rita de Cassia Fernandes , Santana Ana Paula de Oliveira
Published: April 2020

RESUMO O objetivo deste trabalho é analisar implicações subjetivas decorrentes do processo de patologização da educação. Para tanto, foram realizadas entrevistas com duas crianças com diagnóstico de Transtorno de Déficit de Atenção/Hiperatividade, seus pais e professores, observação em sala de aula, avaliação fonoaudiológica individual e pesquisa documental. Os resultados do estudo apontam que os discursos que se instauram em torno do aluno considerado resistente ao que a escola propõe terminam por comprometer a formação da sua subjetividade, uma vez que ele passa a assimilar parte das percepções de seu grupo de convivência. Assumindo os postulados de Bakhtin, de que a autoimagem se constrói em meio ao olhar do outro, conclui-se que a criança pode apresentar sinais de desatenção e hiperatividade (e sintomas de sofrimento) a depender da qualidade das interações sociais em que está inserida.
Autobiografia e (res)significação
Authors: Santos Yuri Andrei Batista , Torga Vânia Lúcia Menezes
Published: April 2020

RESUMO É cada vez mais sensível a grande profusão de distintas formas de narratividade (auto) biográfica na sociedade contemporânea. A partir do que apresentam pesquisas em diferentes campos dos estudos em linguagem, faz-se incontestável a heterogenericidade com que diversas formas de narração do eu em diferentes tons de autorreferência têm insurgido numa sociedade altamente midiatizada e globalizada. Nesse entrever, ancorados no edifício teórico da análise dialógica do discurso em confluência com estudos que se debruçam sobre as escritas de si, propomo-nos a discutir a ressignificação como ato característico do movimento de autorreferência constitutivo da autobiografia e de algumas outras formas de narrativas do eu. Dentre outras observações, destacamos, na construção discursiva de textos autorreferentes, como a autobiografia, um entrecruzamento entre sentidos, memórias e vivências em uma relação de ressignificação sob a luz do que o sujeito não só foi como agora é.
Hibridização e gêneros do discurso em Recife frio, de Kleber Mendonça Filho
Authors: Silva Adriana Pucci Penteado de Faria e
Published: April 2020

RESUMO Neste trabalho, proponho uma leitura de aspectos discursivos do curta-metragem de ficção Recife frio (2009), de Kleber Mendonça Filho, com o objetivo de refletir sobre como a hibridização de gêneros na obra, decorrente da presença de gêneros intercalados no filme, cria sentidos e provoca determinada postura na interlocução com os espectadores. Para tanto, discuto alguns conceitos-chave da teoria bakhtiniana, descrevo momentos específicos do curta-metragem e proponho análises pontuais de determinadas cenas ou sequências. A forma de diálogo com o corpus segue os pressupostos da poética sociológica que perpassa as discussões empreendidas por Bakhtin e pelos demais pesquisadores do(s) Círculo(s). As reflexões apresentadas apontam para um jogo de cena entre ficção e realidade, que, no curta, são acionados pela presença de elementos que podem ser associados ao gênero documentário.
Vulnerabilidade das microrregiões do Nordeste brasileiro à pandemia do novo coronavírus (SARS-CoV-2)
Authors: Raimundo Rafael , Maia Kate , Muniz Danilo , Cantor Mauricio , Guimaraes, Jr. Paulo , Lemos-Costa Paula , Santana Erika , Gaiarsa Marilia , Santana Pamela , Giacobelli Leandro , Assis Ana Paula , Birskis-Barros Irina , Medeiros Lucas , Marquitti Flávia , Dáttilo Wesley , Andreazzi Cecilia , Pires Mathias , Velásquez Viviana , Migon Eduardo
Published: April 2020

Este é o primeiro relatório do Observatório COVID1920 - Grupo: Redes de Contágio – Laboratório de Estudos de Defesa para a região Nordeste do Brasil. Combinamos dados de casos confirmados do novo coronavírus (SARS-CoV-2) para o Nordeste, conforme disponível até o dia 02/04, com análises estruturais da rede de rotas rodoviárias intra e interestaduais para estimarmos a vulnerabilidade e potencial influência das microrregiões nordestinas na propagação da doença.
A benchmarked framework for geometric digital twinning of slab and beam-and-slab bridges
Authors: Lu Ruodan , Brilakis Ioannis
Published: April 2020

This paper describes the design, implementation and benchmarking of a framework for automating the process of geometric digital twinning for existing slab and beam-and-slab bridges. Called Lukis, the framework followed a top-down strategy to detect and twin bridge concrete elements in point clouds into an established data format. Existing software packages require modellers to spend many hours generating shapes to fit point-cloud sub-parts. Previous methods can generate surface primitives combined with rule-based classification to produce cuboid and cylinder models. While these methods work well in synthetic datasets or simplified cases, they encounter challenges when dealing with real-world point clouds. This challenge was tackled by investigating the entire workflow of geometric digital twinning for bridges and proposing a new framework to auto-generate bridge objects without needing to generate low-level surface primitives. The framework was implemented on a single software platform. Experiments demonstrated its ability rapidly to twin geometric bridge concrete elements. Compared with manual operation, the framework reduced the overall twinning time by at least 95% while the twinning quality (spatial accuracy) was improved. Lukis is the first framework of its kind to have achieved geometric digital twinning for primary concrete elements of bridges on one platform. It has laid foundations for researchers to generate semantically enriched digital twins.
Tracking Labor Market Developments during the COVID-19 Pandemic: A Preliminary Assessment
Authors: Cajner Tomaz , Crane Leland D. , Decker Ryan A. , Hamins-Puertolas Adrian , Kurz Christopher
Published: April 2020

Many traditional official statistics are not suitable for measuring high-frequency developments that evolve over the course of weeks, not months. In this paper, we track the labor market effects of the COVID-19 pandemic with weekly payroll employment series based on microdata from ADP. These data are available essentially in real-time, and allow us to track both aggregate and industry effects. Cumulative losses in paid employment through April 4 are currently estimated at 18 million; just during the two weeks between March 14 and March 28 the U.S. economy lost about 13 million paid jobs. For comparison, during the entire Great Recession less than 9 million private payroll employment jobs were lost. In the current crisis, the most affected sector is leisure and hospitality, which has so far lost or furloughed about 30 percent of employment, or roughly 4 million jobs.
ETYMOLOGY IN THE EARTH SCIENCES: FROM ‘GEOLOGIA' TO ‘GEOSCIENCE’
Authors: HOWARTH RICHARD J.
Published: April 2020

The origin and usage through time of geologia, geognosy, geogony, oryctognosy, geology and geophysics, as characterised by their frequency of occurrence in the Google Books Ngram Corpus, is discussed. The English, French, German, Italian and Spanish corpuses used in this study have been normalised over the same timespan using the average frequencies of occurrence of the same set of ‘neutral’ words in each language (as advocated by Younes and Reips 2019). Use of the term geology is found to predate publication of James Hutton's Theory of the Earth in 1795 by about 100 years; geognosy, oryctognosy and geogony, much less commonly used, became established in the 1780s and began to fall out of use around 1820. The terms geologist, and geognost follow a similar pattern. The emergence of geophysics is a less familiar field: While the phrases physics of the Earth and physical geography can both be traced back to the early 1700s, geophysics only began to be used in the early 1800s and did not really become common until about 1860; geophysicist becomes common in German after 1860, but more generally after 1880. The first geophysics-related publications were bulletins from magnetic and seismic observatories and its first dedicated journal, Beiträge zur Geophysik, began publication in 1887, eighty years after the formation of The Geological Society of London. The tems earth science and geoscience, popular today, have steadily increased in their usage since being introduced in the 1880s and 1930s respectively.
MONTE AMIATA VOLCANO (TUSCANY, ITALY) IN THE HISTORY OF VOLCANOLOGY, PART 1: ITS ROLE IN THE DEBATES ON EXTINCT VOLCANOES, SOURCES OF MAGMA, AND ERUPTIVE MECHANISMS (1733–1935)
Authors: VEZZOLI LUIGINA , PRINCIPE CLAUDIA
Published: April 2020

A review of the main contributions to the scientific literature between the eighteenth and twentieth centuries concerning the geology and volcanology of Monte Amiata volcano (Tuscany, central Italy) is presented. Monte Amiata, and the nearby volcano of Radicofani, are of great interest for the history of volcanology because they have the primacy of being the first to be recognized of volcanic origin in a region (Tuscany) which was not volcanically active, thirty years before Guettard's studies on the Auvergne region in France. Indeed, the Florentine botanist Pier Antonio Micheli identified as extinct volcanoes Radicofani in 1722 and Monte Amiata in 1733. Moreover, the merit of Micheli's work resides in interpreting Monte Amiata as an extinct volcano despite the absence of a conventional cone-shaped volcano morphology, and in his recognizing its rocks as lavas despite their marked differences to those produced by the known active volcanoes of its times, such as the iconic Vesuvius.

During the eighteenth century and until the first half of the nineteenth century, Monte Amiata was a destination for scientific journeys by Tuscan and foreign scholars (e.g. Micheli, Baldassarri, Arduino, Fortis, Ferber, Dolomieu, Santi, Repetti, Hoffmann). In addition, its rocks were part of important collections throughout Europe visited by illustrious mineralogists. Furthermore, samples from Monte Amiata were used to illustrate the general discussions on the nature and origin of rocks such as basalt and granite.

In the nineteenth century, Monte Amiata was included in the lists of known volcanoes recorded in the early treatises on volcanology made by Scrope, Daubeny, and Hoffmann, and its ‘trachyte’ was the subject of early essays on microscope petrography and chemical analysis of rocks, performed by vom Rath, Rosenbusch, Williams, Lacroix, and Washington. Between the end of the nineteenth century and the first quarter of the twentieth century, the volcano geologists of the Comitato Geologico Italiano, especially Verri, Lotti, and Sabatini, carried out field-surveys on Monte Amiata resulting in geological maps and volcano-stratigraphies. Moreover, modern petrographic (Novarese, Artini, Rodolico) and geographical (Dainelli and Olinto Marinelli) scientific studies were carried out on this volcano. Nevertheless, up to the middle part of the twentieth century, the major interest in Monte Amiata was related not to its volcanological aspects but to its natural resources: drinking waters, diatomaceous earths, earth pigments, and mercury ore-minerals.
EDWARD HITCHCOCK'S GEOLOGICAL SURVEY OF MASSACHUSETTS, 1830–1833
Authors: MCMASTER ROBERT T.
Published: April 2020

From 1830 to 1833, Edward Hitchcock (1793–1864) of Amherst College conducted a geological survey of the state of Massachusetts, the first comprehensive government-sponsored survey in the United States. It was an ambitious undertaking that resulted in a 700-page report published in 1833. The main goal of the survey was to assess the state's mineral resources, the better to promote their extraction and utilization. Increasing the understanding of the geological history of the state was a secondary goal. Some of Hitchcock's projections of potential economic benefit such as from coal, bog iron, and peat, proved to be illusory. But many of the geological insights gained from the survey were formative for Hitchcock and important in the development of geological thought in America. Perhaps the greatest legacy of the survey was its influence on other states, encouraging governors and legislators to emulate the high standard set by Hitchcock. In this paper I examine the major findings of the survey, the effects of those findings on Hitchcock's geological thinking, and the influence of the survey on American geology in the mid-nineteenth century.