bluuebunny/crossref_metadata_2025 huggingface dataset:
Covid19/IT the digital side of Covid19: A picture from Italy with clustering and taxonomy
Authors: Bonnici Vincenzo , Cicceri Giovanni , Distefano Salvatore , Galletta Letterio , Polignano Marco , Scaffidi Carlo
Published: June 2022

The Covid19 pandemic has significantly impacted on our lives, triggering a strong reaction resulting in vaccines, more effective diagnoses and therapies, policies to contain the pandemic outbreak, to name but a few. A significant contribution to their success comes from the computer science and information technology communities, both in support to other disciplines and as the primary driver of solutions for, e.g., diagnostics, social distancing, and contact tracing. In this work, we surveyed the Italian computer science and engineering community initiatives against the Covid19 pandemic. The 128 responses thus collected document the response of such a community during the first pandemic wave in Italy (February-May 2020), through several initiatives carried out by both single researchers and research groups able to promptly react to Covid19, even remotely. The data obtained by the survey are here reported, discussed and further investigated by Natural Language Processing techniques, to generate semantic clusters based on embedding representations of the surveyed activity descriptions. The resulting clusters have been then used to extend an existing Covid19 taxonomy with the classification of related research activities in computer science and information technology areas, summarizing this work contribution through a reproducible survey-to-taxonomy methodology.
Excluding the margins: Indonesian media’s framing of women and people with disability in the COVID-19 pandemic reporting
Authors: Parahita Gilang , Nurhadi
Published: June 2022

There are only a few pieces of research that show how online news covers the COVID-19 pandemic and its effect on different sections of society, including marginalized groups such as women and people with disabilities (PwD). During the COVID-19 pandemic, when marginalized people struggle for their livelihoods, inclusive journalism plays an important role. This research investigates the practice of inclusive journalism through the framing of women and PwD in some Indonesian online news media from March to June 2020. This research employed the content analysis method to analyse and study several news portals covering COVID-19 issues in local Yogyakarta and the national context. Framing data of the two marginalized groups showed the Indonesian news portals have portrayed women and PwD during the early phase of the pandemic. The dominant frames applied include government policies and solidarity for both women and PwD in national news, and solidarity and resilience for women and PwD in local news. It was found that all of the news on marginalized groups had a positive tone. However, because of limited access to marginalized groups and their supporters, government sources became dominant actors in determining news frames. Therefore, inclusive journalism has not been fully achieved.
Aproximación a los diálogos en prensa periódica de los siglos XIX y XX: primeras aportaciones para un repertorio bibliográfico digital
Authors: Faba Durán Celia
Published: June 2022

El presente trabajo tiene como objeto de estudio la búsqueda, recopilación y análisis de diálogos en prosa publicados en prensa periódica de los siglos XIX y XX para ser incorporados paulatinamente a Dialogyca BDDH. Para ello se han utilizado fuentes de información, tales como hemerotecas digitales o la Colección de índices de publicaciones periódicas del CSIC, que han facilitado el vaciado de 24 revistas, que contenían 102 diálogos en prosa, editadas entre los años 1804 y 2000. El análisis de los textos demuestra una clara continuidad del género dialogado acorde con la tradición y, además, presenta innovaciones propias del medio en que vieron la luz, como la publicación por entregas. Esta investigación finaliza con un avance para un repertorio bibliográfico de diálogos en prensa periódica del lapso seleccionado.
La migración como factor clave en el desarrollo de una filosofía romántica española
Authors: Bernal Ferriz Julia María
Published: June 2022

La migración global iniciada a principios del siglo XVIII fue un factor decisivo para que individuos de mentes preclaras estrecharan fuertes vínculos de amistad y compartieran ciencia y cultura. Habiendo padecido los rigores del absolutismo y conocedores de los errores y defectos de la sociedad, los liberales pacíficos elaboran un plan para la regeneración del país. La crítica artística y literaria dará a conocer el nuevo ideario a través de revistas como El Artista. El análisis pormenorizado de las biografías incluidas en la revista, así como los testimonios de emigrados, revelan el complejo entramado de relaciones personales entre los firmantes y los ingenios a los que aluden. La sólida formación ilustrada de base neoclásica se enriquece con las ideas de la masonería moderna y absorbe la estética romántica de origen alemán reformulada desde Italia y Francia. La conciencia histórica, avivada por la Revolución francesa, impulsa a una última reinterpretación de todo ese caudal informativo que devendrá en la Filosofía romántica española.
Peral Vega, Emilio. «De sentidos guarnecido y potencias ilustrado»: la recuperación del auto sacramental en España (1918-1939). Madrid: Guillermo Escolar Editor, 198 páginas, 978-84-18981-03-6
Authors: Coello Hernández Alejandro
Published: June 2022

Reseña del libro: Peral Vega, Emilio. «De sentidos guarnecido y potencias ilustrado»: la recuperación del auto sacramental en España (1918-1939). Madrid: Guillermo Escolar Editor, 198 pp., ISBN 978-84-18981-03-6.
OS CAMINHOS DA INTERNACIONALIZAÇÃO DE UMA EMPRESA PARAGUAIA: O CASO DA AGRÍCOLA TIERRA NOVA
Authors: Vieira Josy , Morandi Carine Leticia
Published: June 2022

Mediante o crescimento estratégico das empresas, o gestor é fundamental no processo de tomadas de decisões, principalmente no processo de uma correta internacionalização que vise às melhores estratégias e que garanta a eficácia de sua competitividade. Desta forma, este caso para o ensino aborda o posicionamento de López, um gestor visionário que, à frente da Agrícola Tierra Nova, localizada em Santa Fé, no Paraguai, viu os negócios prosperarem ao ponto de cogitar a possibilidade de abertura de uma subsidiária no Brasil. Para tanto, com o intuito de obter uma visão mais ampla do atual panorama interno e alguns fatores externos, uma empresa de consultoria em planejamento estratégico foi contratada para realizar uma análise SWOT. Mediante as análises, López vive um dilema sobre o futuro da empresa, e qualquer decisão errônea poderia comprometer tudo que foi conquistado. Deveria López acreditar na sua capacidade de gestão e arriscar na expansão da empresa ou manter o panorama atual? Com base na análise SWOT e considerando os ambientes externos, principalmente a respeito dos campos políticos e econômicos do Brasil, deve apostar na abertura da subsidiária no Brasil ou rever as estratégias de expansão? Estes são alguns dos questionamentos que López terá pela frente.
ECOLOGICAL NICHE BASED ON FISH FOOD COMPETITION AND FEEDING HABIT PATTERNS IN THE JATIBARANG RESERVOIR
Authors: Ain Churun , Anggoro Sutrisno , Wijayanto Dian , Rudiyanti Siti , Isroliyah Afifatul
Published: June 2022

The purpose of this study was to determine ecological niche, the types of fish caught using gillnet and fishhook, the abundance of plankton, feeding habits and food competition in Jatibarang reservoir. The research was conducted from July until October, 2020. Tilapia (Oreachromis niloticus), Milkfish (Chanos chanos), Grass Carp (Ctenopharyngodon idella), Java Barb (Barbonymus gonionotus), and Red Devil (Amphilophus amarillo) were several types of fish found in the Jatibarang Reservoir. The total abundance of plankton was 4220 ind /, with L.Chlorophyceae dominating with a value 1780 ind / L and Zooplankton with the lowest abundance value of 20 ind / L. The result of the dominant Index of Preponderence (IP) showed Chlorophyceae class as the staple food of Tilapia, Grass Carp and Java Barb with values of 49.86%, 45.16% and 52.34% respectively. Milk fish and Red Devil had no main food (IP < 40%). The others class of plankton (Bacillariophyceae, Coscinodiscophyceae, Dinophyceae, Euglenoidea Cyanopyceae, Fragilariophyceae, and Zygnematophyceae) appeared as complementary foods (IP value 4-40%) and as additional food (IP value lesser than 4%). Milkfish was also found to have the highest ecological niche value of 4.577 and the Red Devil with the lowest value. The result of the niche overlap indicated the strongest good competition occurred between Tilapia and Gras Carp with a yield value of 1, and the lowest overlap value was found between Milkfish and Red Devil.
Luwian Curses as Religious Discourse
Authors: Puértolas Rubio Laura
Published: June 2022

Luwian incantations embedded in Hittite ritual texts reflect local traditions and religious discourses of different parts of Anatolia and Northern Syria. Among the various types of Luwian incantations, this paper will focus on the contextual analysis of cuneiform Luwian curses related to the Kuwattalla and Puriyanni traditions. Curses will be studied as religious discourse, analysing how individual elements of the curse interplay with the general structure of the ritual text in which it is embedded. To do so, a comparative perspective will be applied. Hittite ritual texts coming from the same or adjacent areas and reflecting common religious traditions will be used to elucidate difficult passages. This study may contribute to improve our understanding of Luwian texts as well as to highlight local concepts related to witchcraft.
Relative Income Concerns, Dismissal, and the Use of Pay-for-Performance
Authors: Demougin Dominique , Upton Harvey
Published: June 2022

This paper studies optimal incentive contracting under moral hazard when workers exhibit relative income concerns and compare their earnings with the economy’s average wage. We show that when firms have access to a rich performance measure, the optimal contract takes a binary form if effort is sufficiently low and a ternary form otherwise. We then use these results to investigate how contractual structure varies throughout the economy when firm-worker pairs are heterogeneous with respect to either their productivity, or the information system used to align incentives. We argue that our findings suggest that the incidence of pay-for-performance should be highest for jobs which significantly contribute to overall firm profitability and for which a worker’s performance is difficult to measure. These predictions appear largely consistent with recent empirical evidence.
An efficient post-quantum KEM from CSIDH
Authors: Qi Mingping
Published: June 2022

The SIDH and CSIDH are now the two most well-known post-quantum key exchange protocols from the supersingular isogeny-based cryptography, which have attracted much attention in recent years and served as the building blocks of other supersingular isogeny-based cryptographic schemes. The famous SIKE is a post-quantum key encapsulation mechanism (KEM) constructed on the SIDH, motivated by which, this article presents a new post-quantum KEM-based on the CSIDH, which is thereby named as CSIKE. The presented CSIKE has much higher computation efficiency in the decapsulation part by involving an additional tag in the encapsulation results. The new CSIKE is formally proved to be IND-CCA secure under the standard isogeny-based quantum resistant security assumption. Moreover, by comparing the new CSIKE with the only two existing CSIDH-based KEM schemes, i.e., CSIDH-PSEC-KEM and CSIDH-ECIES-KEM, it can be easily found that the new CSIKE has a slightly longer encapsulation size than CSIDH-PSEC-KEM and CSIDH-ECIES-KEM, but (i) it beats the CSIDH-PSEC-KEM by the improvement of approximately 50% in decapsulation speed, and (ii) it has a certain advantage over the CSIDH-ECIES-KEM in security since in the random oracle model, the security proof for CSIDH-ECIES-KEM needs to rely on the stronger CSI-GDH assumption, while the new CSIKE just needs to rely on the basic CSI-CDH assumption.
Magyar építészek Dél-Ázsiában és közvetítőszerepük a magyar építészetben
Authors: Baldavári Eszter
Published: June 2022

The role of oriental art was significant in architecture at the turn of the 19th and 20th century. While the Art Nouveau movement in Western Europe was influenced by the Japanese and Persian art, Hungary made efforts to find the origin of the Hungarian architecture. This study presents the Asian trip of architect Károly Róbert Kertész, published in his work entitled Architecture of Ceylon. In the 1930’s architect István Medgyaszay was invited to India to design a museum in Mumbai. His archive, containing the plans, photographs and letters born during the trip, can be found in the Medgyaszay Memorial House. During the reconstruction of Medgyaszay’s Indian trip (2021) some mysterious watercolour plans were discovered among his designs. Additionally, as a result of the research in Mumbai (2020) this study introduces István Medgyaszay’s friendship with Perin Jamshedji Mistri, the first professional woman architect in India; and highlights the role of Jenő Cholnoky geographer in the work of both of the aforementioned architects.
La construcción democrática del precedente constitucional: un estudio de caso en las decisiones penales
Authors: Palomares García Jorge Ricardo , Torres Salazar Victoria
Published: June 2022

Este artículo presenta la construcción participativa del precedente como una alternativa para la tensión que existe entre la democracia y la defensa judicial de la Constitución. Esta alternativa considera que la arquitectura de la Constitución Política de Colombia permite que los ciudadanos participen en el diseño de reglas constitucionales a través de las intervenciones en los procesos de constitucionalidad, en general, y de revisión, excepcionalmente. Para ello, se revisará un conjunto particular de fallos relacionados con asuntos penales.
Teorías aplicables a la protección ambiental de los recursos hídricos compartidos internacionalmente
Authors: Becerra Dayana
Published: June 2022

El artículo presenta un avance de investigación alusivo al rol que desempeñan las diferentes teorías referidas a la soberanía sobre los recursos hídricos compartidos por Estados y analiza su pertinencia y utilidad, con el fin de identificar los elementos que puedan aportar a la construcción de una teoría novedosa de la soberanía sobre estos recursos, que garantice de forma óptima su protección y preservación ambiental. Para lograrlo, en primer lugar, se exploró el concepto de soberanía y los diferentes postulados que se han planteado al respecto para, en segundo lugar, profundizar en el análisis de las teorías de la soberanía concernientes al ejercicio de poder sobre los recursos hídricos. Entre dichas teorías se encuentra una variada gama de concepciones que van desde la soberanía territorial absoluta y la integridad territorial absoluta, hasta las restrictivas, basadas en el abuso del derecho, en las servidumbres internacionales y en las relaciones de vecindad, así como la referente a la comunidad de intereses y a la de cuenca hidrográfica internacional, todas las cuales conducen, en tercer lugar, a proponer la teoría de la soberanía común de los recursos hídricos compartidos.
Canales de transmisión del precio de la vivienda usada en Colombia: una aproximación FAVAR
Authors: Gómez Romero Óscar Daniel
Published: June 2022

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La sostenibilidad empresarial desde las prácticas sostenibles, los grupos de interés y la responsabilidad social corporativa: una revisión de la literatura
Authors: Montoya Morales Alexa Juliana , García Londoño Martha Lucía , Vélez Ramírez Rubén Antonio
Published: June 2022

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Plataformas blockchain para ejecutar contratos inteligentes, un acercamiento empresarial y gubernamental
Authors: Ahumada Lerma Rafael Santiago
Published: June 2022

El concepto de blockchain día a día va tomando más relevancia, por que, cada vez se hace más necesaria la elaboración de documentos en los que se ilustre sobre el funcionamiento de esta tecnología disruptiva, puesto que la literatura primaria y secundaria relacionada aún es muy poca. En el siguiente artículo se explicarán diferentes plataformas tecnológicas en las que se puede aplicar el blockchain, detectando sus respectivos aspectos positivos y negativos. Adicionalmente, se mostrarán casos de uso de cada una de estas plataformas, tanto a nivel empresarial como gubernamental, para que el lector se pueda acercar más al beneficio que tendría la aplicación de esta tecnología. Finalmente, se analizarán los retos y desafíos que debemos tener presentes al momento de incursionar en la implementación de esta.
Actores y víctimas del conflicto armado colombiano: batallas por la memoria en estudiantes
Authors: Arias Gómez Diego Hernán
Published: June 2022

El presente artículo parte de una investigación cuyo objetivo fue analizar relatos de estudiantes de octavo y décimo grado de colegios públicos y privados sobre el conflicto armado colombiano desde la perspectiva de las memorias sociales. Se indagó por los actores más negativos, los hechos más recordados y las víctimas de este pasado reciente. Para ello se recurrió a cuestionarios cerrados, producción de relatos y entrevistas virtuales. Entre los principales hallazgos está la relevancia dada a la guerrilla como actor nocivo, el Bogotazo como hecho detonante del conflicto y la solidaridad con las víctimas, principalmente campesinos, como sentimiento más evocado. Adicionalmente se considera que las miradas sobre el conflicto son construcciones sociales cruzadas por batallas de la memoria, donde versiones hegemónicas y alternativas buscan imponer legitimidad sobre lo sucedido.
Configuración de un ambiente de aprendizaje: una mirada desde la educación matemática crítica
Authors: ALVIS PUENTES JOHNNY FERNANDO , Aldana Bermúdez Eliécer , Sepúlveda Delgado Omaida
Published: June 2022

Asumir la formación de estudiantes como ciudadanos reflexivos, que puedan hacer una interpretación de la realidad desde las matemáticas escolares, configura aspectos de indagación desde la Educación Matemática. En ese sentido, este artículo tiene como propósito, describir las actuaciones y el posicionamiento de estudiantes en la configuración de un ambiente de aprendizaje, que potencie la integralidad de un ciudadano constructivo y reflexivo, en la formación de una ciudadanía crítica. Ante ello, la investigación fue orientada mediante un enfoque cualitativo con cortes descriptivos y comprensivos, teniendo como población estudiantes del grado noveno de una Institución de Educación Básica Secundaria en el contexto Colombiano. Se concluye que la configuración del ambiente de aprendizaje por parte de los estudiantes, es fruto de las nuevas visiones sobre lo que pueden ser las matemáticas escolares, permitiendo comprender que las matemáticas tienen el propósito de organizar parte de la realidad de los ciudadanos.
Evidence of improved bond strength of resin-based sealer with the use of natural antioxidants on hypochlorite treated dentin: an in vitro study
Authors: Aameenabanu Mayana , Sravanthi Tammineedi , Bolla Nagesh , Vemuri Sayesh , Basam Ram Chowdary , Garlapati Roopadevi , Chukka Ram Sunil
Published: June 2022

Aim. To evaluate the effect of natural antioxidants as final irrigants on the push-out bond strength of epoxy resin-based sealer to the hypochlorite treated dentin.

Methods. Eighty single-rooted human mandibular incisors were prepared using ProTaper Gold (Dentsply, TN, USA) and an irrigation protocol including 3% NaOCl, followed by ethylenediaminetetraacetic acid (EDTA), and 3% NaOCl. The groups (n =20) were divided according to the final irrigant used: Group 1: None (Control); Group 2: 5% sodium ascorbate, Group 3: 5% grape seed extract (GSE); and Group 4: 5% pine bark extract. The obturation of root canals was performed using gutta‑percha and AH Plus (Dentsply DeTrey, Germany). Bond strength was evaluated using the push‑out test under the universal testing machine at a crosshead speed of 0.5 mm/min, and statistical analyses were performed using one-way ANOVA. The p-value significance was evaluated by Tukey’s post hoc test (p<0.01).

Results. Mean push-out bond strength values were compared in all the groups, and there was a statistically significant improvement in the experimental final irrigating groups. 5% pine bark extract had improved bond strength than the other groups, and the least bond strength was observed in the control group.

Conclusion. The irrigation protocols and naturally derived antioxidants affected the resin‑based sealer’s bond strength to root dentin. It was observed that the use of antioxidants effectively reversed the compromised bond strength of resin‑based sealers to root dentin. 5% pine bark extract application showed better bond strength.
Yasser Arafat dan Konflik Palestina-Israel (Tinjauan Sejarah)
Authors: Firdaus Firdaus , Septian Putra Johan , Saaulia Reni , Adnis Sulfina
Published: June 2022

Artikel ini bertujuan untuk mengungkapkan bagaimana perjuangan Yasser Arafat dalam menghadapi konflik Palestina Israel. Penelitian ini menggunakan metode penelitian sejarah. Perubahan drastis ketika orang-orang imigran Yahudi berpindah ke tanah Palestina dan kemudian membentuk gerakan Zionis Israel serta mendirikan negara Israel di tanah yang dihuni oleh masyarakat Palestina. Akibatnya muncul perlawanan dan perjuangan rakyat Palestina. Salah seorang tokoh kenamaan Palestina Yasser Arafat mempunyai tekad kuat memperjuangkan rakyat Palestina dari penindasan dan penjajahan yang dilakukan oleh Zionis Israel di Palestina. Yasser Arafar dalam menghentikan kolonialisasi tersebut menggunakan wadah pergerakan organisasi PLO dan Fatah yang saling bersinergi dalam menuntaskan polemik hebat Palestina dan Israel di tanah Arab. Akan tetapi, semuanya tidak berjalan dengan lancar, bahkan melalui diplomasi maupun non-diplomasi pada akhirnya tidak menyelesaikan konflik tersebut hingga akhir hayat Yasser Arafat.
Pío XII y los inicios del CELAM. Primeras publicaciones
Authors: Bermúdez Catalina
Published: June 2022

El texto pretende ofrecer una mirada retrospectiva sobre la creación del Consejo Episcopal Latinoamericano, como un gran acierto histórico y eclesial fraguado lentamente en la mente y en la acción de los que denominamos «padres» de la teología y la pastoral latinoamericanas, ante las necesidades imperiosas de la región. Particularmente la mirada se centra en las intervenciones de Pío XII a lo largo de su pontificado, y sucesivamente en la continuidad creativa de sus sucesores, quienes, con una impronta propia, supieron dar continuidad a la visión profética del papa Pacelli, con miras al fortalecimiento y extensión de la Iglesia en América Latina.
Artificial senses and their fusion as a booming technique in food quality assessment
Authors: Kaur Kamaljit , Kiran Ekaspreet , Aggarwal Poonam
Published: June 2022

Sensory science has witnessed increased adoption of technological advancements in recent years. Food analysis using human senses severely impacted the evaluation responses due to errors and the complexity of the assessment methods. Hence, the adoption of tools capable of mimicking human senses is considered a more viable approach. This article provides a critical demonstration of the developments in sensory science detailing the technology behind the construction and working of the electronic tongue, electronic nose, and electronic eye. The paper also attempts to brief the industrial applications of artificial senses and the fusion technique in monitoring as well as assessment of food quality.
Morphological description and DNA barcoding study of Paramignya trimera collected in Khanh Hoa, Vietnam
Authors: Cam Mien Phi Thi , Bich Ngoc Pham , Hoang Ha Chu , Duc Bach Nguyen
Published: June 2022

Paramignya trimera is a valuable traditional medicinal plant, typically distributing in Khanh Hoa, Vietnam. In recent years, P. trimera has been exploited to treat liver diseases such as hepatitis, cirrhosis and liver cancers. The recorded during the investigation, in Khanh Hoa currently appears a number of species with similar phenotypes known collectively as P. trimera and appeared some morphology with differences in leaf morphology and thorns. Therefore, this study was carried out for identification, breeding and propagation conservation.This study has been described, characterized morphological characteristics and analyzed DNA barcodes based on ITS, matK and rbcL gene markers. About the morphology, P. trimera is distinguished from other species of the genus Paramignya with the following characteristics: elongated, single leaf, leaf-shaped lobe end, leaf veins shaped like a feather. Petiole with big, pointed and straight spines. Corolla 3, 6 stamens, upper election, with three sepals and two ovule leaves, the seed has a  seed coat. The analysis of DNA barcodes shows that the results combination of the analysis of the three regions of ITS, matK and rbcL can be used to determine the genetic relationship between five samples of P. trimera. The nucleotide sequence lengths of the samples for the three regions of the ITS, matK and rbcL genes are 850 bp, 850 bp and 500 bp, respectively. On the basis of phenotypic tree analysis, the samples (X1, X2, X3, X4, X5) have the same evolutionary origin in ITS, matK and rbcL. Base on to identified the five morphological forms of P. trimera distributed in Khanh Hoa as the same species and expanded the distribution area as well as in-depth research on P. trimera morphologies in Khanh Hoa, Vietnam.
Purification of wild type and recombinant xylanases and evaluation of their arabinoxylan hydrolysis ability
Authors: Tuyen Do Thi , Thu Ngan Nguyen , Mai Anh Dao Thi , Thi Hong Nhung Nguyen
Published: June 2022

Arabinoxylan hydrolyzing enzymes are very rich and diversified groups, among these, endo-1,4-β-xylanase is the most important group which catalyzes the cleavage of xylan main skeleton to release arabinoxylan oligosaccharides such as D-xylose, xylobiose, L-arabinose, xylotetraose, xylopentose.  This group of enzyme was efficiently produced from natural microorganism including bacteria, yeast and fungi and recombinant strains. In this study, we have purified wild-type and recombinant xylanase to compare the difference in hydrolysis products of these two enzymes. Using sephadex G-100 and DEAE-sephadex column chromatography, we have purified xylanase from wild-type Aspergillus niger DSM1957 with molecular weight of 25 kDa, specific activity of 3240 IU/mL, the purity increases 1.68 folds compare to crude extract, and a recovery rate of 36%. The recombinant enzyme from Pichia pastoris GS115/pPXlnA was purified by ProbondTM affinity chromatography column, with a molecular weight of 36 kDa; the purity increased 3.2 folds than the crude extract, and with the recovery efficiency of 21.1%. The activity of commercial wild-type xylanase was better than that of our recombinant and wild-type enzymes. Our wild-type xylanase could hydrolyze arabinoxylan into L-arabinose in 50 mM CH3COONa pH 5.0. Our results showed that xylanases purified from different sources were stable and highly specific to xylan. Xylanase has potential application in the production of high quality biotechnological products.
Benthic cyanobacteria composition and microcystin concentration in the sediment of the Tri An Reservoir
Authors: Thanh Luu Pham , Hoang Yen Tran Thi , Ha Bui Manh , Cam Loan Tu Thi , Thi Thanh Thuy Hoang , Thanh Son Dao , Tu Nguyen Van , Thai Tran Thanh , Quang Ngo Xuan
Published: June 2022

The occurrence of cyanobacterial blooms (CYBs) associated with cyanotoxins has been reported worldwide. While planktonic cyanobacteria and the contamination of microcystin (MC) in the water column have been the subject of many investigations, little attention is paid to the benthic cyanobacterial communities and MC concentration in the benthic environment. This study aimed to investigate the benthic cyanobacterial composition and MC concentration accumulated in sediment from the Tri An Reservoir (TAR), Dong Nai province. Benthic cyanobacterial communities and sediment were collected at five sites in dry and rainy seasons. The benthic cyanobacterial communities were morphological observation and identification. Different nitrogen, phosphorus species, and chlorophyll-a (Chl-a) in sediment were analyzed. MCs concentration in sediment was quantified by High-Performance Liquid Chromatography (HPLC). Results indicated that the sediment from the TAR was contaminated with nitrogen. A total of 19 species belonging to 12 genera, 3 orders of cyanobacteria were identified. In which, Anabaena, Oscillatoria, and Microcystis were the three most commonly found in the samples. Surface sediment samples contained high densities of colonial Microcystis. The Chl-a concentration in sediment in dry and rainy seasons ranged from 1.96–3.45 and 0.71–3.15 µg/g fresh weight (FW), respectively. MC was detected in sediment at all sites in both dry and rainy seasons with a concentration up to 191.4±14.2 ng/g FW. The outcome of this study provides basic knowledge on MC and potential MC-producing cyanobacteria in a drinking water supply. Further investigation on the toxic producing ability of the benthic cyanobacteria species from the Tri An Reservoir is required.
Effect of silver nanoparticles on sterilization of different explant sources of Gerbera jamesonii cultured in vitro
Authors: Hien Vu Thi , Tung Hoang Thanh , Khai Hoang Dac , Luan Vu Quoc , Cuong Do Manh , Lich Tran Van , The Vinh Bui Van , Thi Huong Trinh , Nhut Duong Tan
Published: June 2022

In this study, silver nanoparticles effects on the sterilization of different sources of explants (young leaves, young flower stalks and young flower buds) of Gerbera as well as on the in vitro morphogenesis and their growth were investigated. The explants were sterilized and cut transversally (1 mm) with the flower stalk, square (0.5 × 0.5 cm) for the leaf sample, longitudinally (0.5 mm) for the flowers (removed the petals) and cultured on MS medium; then, the explants (contamination-free or no browning/necrosis) were transferred into MS medium supplemented with 0.02 mg/L TDZ plus 0.8 mg/L adenine, 10% coconut water, 30 g/L sucrose and 8 g/L agar in 15 days. The results showed that AgNPs at the appropriate concentration and duration treatment was effective in explant sterilization of flower bud (0.02% AgNPs and 20 min), flower stalks (0.02% AgNPs and 30 min) and young leaves (0.05% AgNPs and 20 min) after 15 days of culture. In addition, 3 types of morphogenesis including callus induction, somatic embryogenesis and direct shoot regeneration of explants derived from sterilization by AgNPs were improved as compared to that of HgCl2. In addition, research on the optimal medium for shoot multiplication, rooting as well as evaluation of acclimatization and the growth at the greenhouse were also studied. Results showed that MS medium supplemented with 2 mg/L NAA combined with 0.5 mg/L BA and 2 mg/L KIN is suitable for shoot multiplication; meanwhile, MS medium supplemented with 2 mg/L NAA improved rooting ability as well as quality of plantlets and to improving survival rate and acclimatization of Gerbera cultured in vitro.
Growth assessment of various formulae of essential minerals and trace elements on whiteleg shrimp at different salinities
Authors: Viet Do Phuong , Thao Nguyen Suong , Tai Chau Tao , Nguyen TK Loan , Touchet Audric , Gutter Gaetan , Mahl Philippe , Phan Hoang
Published: June 2022

Whiteleg shrimp (Litopenaeus vannamei) is now the main species cultivated in various geographic locations. Whiteleg shrimp have a wide range of salinity tolerance, but a matter of deficiency of minerals and trace elements need to be taken care of when shrimp are grown in low saline area. It may induce higher mortality and slower growth performances of shrimp. Two stages of shrimp juveniles were subsequently tested with different formulae of a liquid nutraceutical of essential minerals and trace elements. Each stage was performed in a 28-day trial with follow-up parameters of shrimp growth indices and environmental changes throughout the tests. The use of mineral supplementation in whiteleg shrimp diet in low salinity area significantly increased growth performance, survival rate and color intensity. This study has demonstrated the efficacy of a liquid form of mineral supplement product administered by top-coating onto the feed to shrimp during 4 weeks of grow-out at 5‰ salinity, but the application was dependent on formula and dose. Further research on application regime using this liquid mineral product should be performed to optimize a protocol for a whole culture crop as different stages of shrimp may require different supplementation doses.
The first record of 4 species of monogenean flatworm on catfish (Clarias fuscus, Hemibagrus spilopterus and Pangasius macronema) in the Dak Lak, Vietnam
Authors: Quang Sang Tran , Thanh Huyen Tran Thi , Thuy Binh Dang
Published: June 2022

Catfish (Order Siluriformes) is one of the largest orders of teleosts containing about 4,100 species with with highly diverse and distributed worldwide, representing about 12% of all teleosts and ∼6.3% of all vertebrates. Catfish are of economic and ecological importance; many large fish species are raised or caught for food, and small fish are cultured as ornamental. Like other fish species, monogenean is a common ectoparasites on catfish with more than 379 species recorded. The current study collected 77 individuals of three catfish species, including Hong Kong catfish Clarias fuscus (n = 21), black spotted catfish Hemibagrus spilopterus (n = 17) and long barbels pangasiid catfish Pangasius macronema (n = 39)) in Dak Lak in 2016 - 2017. Based on morphological and genetic (18S rRNA gene) characters, this study recorded four new dactogyrid monogenean species on the hosts and in Vietnam, in which, Thaparocleidus armillatus and Mizelleus siamensis on P. macronema; Bychowskyella tchangi on C. fuscus, and Cornudiscoides longicirrus on H. spilopterus. Phylogenetic tree constructed of four 18S rRNA sequences from the current study and six sequences on Genbank showed Bychowskyella spp. species formed monophyletic clusters and is sisterly related to the remaining of the species. C. longicirrus species was clustered in the separate clade, while M. siamensis species exhibited paraphyly when grouped with species of the genus Thaparocleidus. There is a need for further analysis of taxonomic characteristics and molecular markers diversity (e.g. Cytochrome oxidase subunit (COI mtDNA), 16S rRNA) to determine the taxonomic position of monogenean species.
Expression of eg9 gene encoding endoglucanase GH8 derived from metagenomic DNA data of bacteria in humus around white rot fungi degrading woods, in Escherichia coli
Authors: Thi Huyen Do , Thu Hoai Le , Hai Dang Nguyen , Thi Quy Nguyen , Nam Hai Truong
Published: June 2022

Endoglucanase is an important enzyme participating in the hydrolysis of cellulose into oligosaccharides or glucoses can be used in a variety of industrial fields. A gene (code GL0183420 designated as eg9) of 1398 bp encoding for endoglucanase family GH8 was identified from metagenomic DNA data of bacteria in the humus surrounding wood hydrolyzed by white rot fungi. The 126 terminal nucleotides at 5' terminal of the gene encode for a signal peptide in gram-negative bacteria and the next 1269 nucleotides encode the endoglucanase GH8. In this study, the eg9 gene (lack of sequence encoding the signal peptid) coding for the mature endoglucanase was codon optimized for expression in E. coli, artificical synthesized, then inserted into pET22b(+) for gene expression in E. coli strains. Through a survey of 5 expressive strains, EG9 was overexpressed in Rosetta and C43 strains. However, at 30oC in LB medium, most of EG9 were expressed in the insoluble fraction, in which Rosetta was the best strain for synthesis of EG9. The enzyme EG9 can be overexpressed in Rosetta strain at a large range of OD600 from 0.2 to 1. After reducing the culture temperature to 25°C, 50% of EG9 was expressed in soluble fraction and exhibited good hydrolysis activity in CMC substrate on agar plate. The investigation of media showed that PE was the most suitable medium for the recombinant Rosetta strain grow and synthesize endoglucanase EG9. EG9 was well expressed at various IPTG concentrations from 0.05 to 0.9 mM. These results offer great potential for production of recombinant EG9 for enzyme properties research.
Determination of apoptotic inductive activities of physagulin P from Physalis angulata plant in Vietnam
Authors: Yen Pham Thi Hai , Nga Nguyen Thi , Phuong Trieu Ha , Cuc Nguyen Thi , Phuong Do Thi , Anh Hoang Le Tuan , Thi Thao Do
Published: June 2022

Currently, multimode treatment is current therapy for cancer that causes various unwanted side effects and costliness for patients. Therefore, finding new natural ingredients derived from plants of which are less toxic and more targeted, are considered to be urgent for development of potential effective drugs to treat cancer due to safety and economic concerns. Physagulin P (VPA22) was known as a novel structural compound, isolated from the species Physalis angulata of the genus Physalis in Vietnam. This active substance has demonstrated cytotoxic effect on lung cancer cell line (A549) with the IC50 value = 13.47±2.73 µM. In our study, VPA 22 was investigated for apoptotic inducing activity on A549 cells by using Hoechst staining, flowcytometry analysis and caspase-3 colorimetric assay. VPA 22 treatment changed the morphology of A549 tending to apoptotic cells whose percentage ranged from 10.09% to 19.18% at the concentration of 5 µM and 15 µM, respectively. In addition, the active ingredient at concentration of 5 µM to 15 µM also significantly activated caspase-3 in turn from 1.30 folds to 2.59 folds. These results together indicated that VPA 22 activated the caspase pathway to trigger out apoptosis on A549 cells and subsequently resulted in inhibition of cancer cell proliferation.
Mellanstadieelevers rörlighet i sina multimodala geografitexter
Authors: Bergh Nestlog Ewa
Published: June 2022

Att lära sig ett skolämne innebär att också lära sig att uttrycka kunskaper i ämnet, skriftligt såväl som muntligt. Den här fallstudien är inriktad på mellanstadieelevers sätt att tala om sina egna multimodala texter inom geografiämnet. Elevtexterna är uppbyggda av skrivet verbalspråk och fotografier. Tidigare studier av hur elever talar om egna texter, det vill säga hur de rör sig i sina texter, har huvudsakligen varit inriktade på verbalspråkliga aspekter, inte på aspekter som rör exempelvis bilder. Syftet med studien är att bidra med kunskap om hur eleverna muntligt uttrycker sig om de egna geografitexterna och textskapandet, och vilka tecken på meningsskapande de visar genom sin textrörlighet. De överordnade teorierna utgörs av dialogiska och socialsemiotiska perspektiv (Bakhtin 1986; Bergh Nestlog 2012; Halliday 1978; Kress 2010). Dessa teorier kombineras med textrörlighetsbegreppet (Langer 2011), som tillämpas i analyserna. Materialet består av transkriberade videoinspelningar av totalt fyra intervjuer med två elever. Resultatet visar att den multimodala orienteringen i texterna och geografiämnet framstår som central för eleverna. Genom textbaserad och transaktiv textrörlighet visar eleverna att texterna är betydelsefulla för dem. I synnerhet texternas multimodala karaktär och undervisningens upplägg verkar ha haft stor betydelse för elevernas engagemang och lärande.
Writing Fluency and Digital Source Use in Authentic Academic Writing
Authors: Ivanov Sergej , Johansson Annelie , Waldmann Christian
Published: June 2022

This paper presents a case study that uses keystroke logging to explore writing fluency and digital source use during an authentic academic writing process in a novice student of data science through the lens of the Simple View of Writing. The study found that the writing of the literature review lasted for 11 hours distributed over 12 sessions. The sessions were thematically divided into four well-defined units with only minor overlaps that could be explained by the design of the task and that may reflect the non-linear and recursive implementation of writing processes at the text production, transcription and monitoring level. The findings suggested that the writer’s fluency, as measured by pauses, revisions and production rate, as well as digital source use reflect the cognitive effort involved in academic writing. The combined pause and revision data indicated a flexible writing profile depending on the complexity of the task at hand and on any approaching deadline for submission of a draft and receipt of feedback. The student demonstrated an effective source use in writing both for informative purposes in the results section and for argumentative purposes in the introduction and discussion. The findings may inform the teaching and learning of academic writing in terms of time allocation for the associated tasks and pedagogical support that addresses crucial language and genre knowledge as well as facilitates the text production and efficient source use.
Main Media Strategies for Informing the Population About the Work of Municipal Organizations (using the example of the multifunctional center of the Sverdlovsk region)
Authors:   Ural Federal University, Amirov Valery M. , Temnikov Alexander S. ,   Ural Federal University
Published: June 2022

The article is devoted to the analysis of practices of informing the population of the region about the work of municipal organizations providing public services. On the basis of quite extensive theoretical material and materials published in the media, the main areas of information, issues of interaction between the media and press structures were identified and analyzed. Among these areas are budgeting issues, the work of offices and branches of municipal organizations, new opportunities that municipal organizations have to serve the population. A feature of the analysis of practices is the appeal to the media of various typologies — the state newspaper, an independent online publication of regional significance and the city online publication. The comparison of approaches to the studied issue of media of different forms of ownership and implementing different media strategies makes the results of the presented analysis more indicative, and the conclusions given at the end of the article sound more convincing.
The magical realism of the novel “The Heart of Parma” by Alexey Ivanov
Authors:   Linguistics University of Nizhny Novgorod, Mosova Diana V.
Published: June 2022

The study is devoted to the peculiarities of the implementation of the historical plot about the conquest of Permian by the Moscow state in the artistic work of Alexey Ivanov. Genre modifications of historical prose are considered on the basis of the novel “The Heart of Parma” in postmodern discourse. The main marker of magical realism in the novel is the author’s specific language, designed to recreate the world of “chthonic” Parma and romanticize the world of the Urals.
The Institutional Component in the Thinking and the First Reforms in Artistic Culture of Russian Avant-garde Artists
Authors:   Independent researcher, Strizhkova Nataliya A.
Published: June 2022

The paper aims to carry out a historical and cultural examination of the insufficiently studied social practice experience of Russian avant-garde artists: their innovative activities leading towards radical institutional modernization of artistic culture in the early years of Soviet power. An institution-and-system approach laid the methodological groundwork for the analysis since it is the phenomenon of the institute that integrates and regularizes various components of artistic culture: artistic consciousness, social subjects, their artistic practices and relationships, strategic and specific programs (goals, values and methods), economic, ideological and political conditions. The paper reflects upon the main paradigms and directions of the restructuring and systemic development of artistic culture and the creative role of avant-garde artists, the short but fruitful experience of their collaboration with the Soviet government. It started with the substantive coordination of the artistic avant-garde program and the ideological program of political power. Then this experience resumed in the avant-garde artists’ work in state cultural management bodies, in their large-scale practical participation in artistic and cultural construction, which they tried to combine with their pioneering notions of art and its social role. V. Kandinsky, K. Malevich, A. Rodchenko, V.Tatlin, N. Punin were among the ideologists and leaders of this transformation program, many avant-garde artists also took part in its implementation. These efforts resulted in creating a network of artistic and cultural institutions of a new type, the formation and implementation of a new state policy in the field of artistic culture, the change in the principles and forms of organization and functioning of all aspects of artistic culture. The author concludes that the short tenure of avant-garde artists and the implementation of their institutional construction program had a significant impact on the development of artistic culture of the early Soviet period. It has fulfilled the task of its drastic modernization, which had no analogues in the world, and later, even in the face of an artificially interrupted reform process, became a resource for its future development.
Floristic survey of a Caatinga area of high biological importance in the Mesoregion of Paraíba backlands, Northeast Brazil
Authors: Fernando Emanoel Messias Pereira , Campos Ketley Gomes , Mamede Mickaelly de Lucena , Lucena Maria de Fátima de Araújo
Published: June 2022

ABSTRACT The Caatinga occupies an area of approximately 912,529 km², being one of the most distinct phytogeographic regions of the Brazilian territory. It has a vegetation that varies according to its distribution and relationship with the geography of each area. This study aimed to carry out a floristic survey of ABA farm, located in the municipality of Passagem, mesoregion of the Paraíba backlands. For four years, fortnightly botanical collections were carried out in all the plant's physiognomies on the farm, following a standard botanical protocol of floristic survey and herborization techniques. The results of this research brought up an important floristic list, consisting of 322 species from 194 genera belonging to 62 botanical families. Among these families, the ones with the higher number of species were Fabaceae (48 spp.), Euphorbiaceae (23 spp.), Convolvulaceae (21 spp.), Malvaceae (19 spp.) and Asteraceae (15 spp.). The habits were herbs (108 spp.), trees (59 spp.), subshrubs (56 spp.), shrubs (46 spp.), lianas (46 spp.), epyphytes and parasites (four spp.) In addition, 38 new species records were registered for the Paraíba State.
Finding and Recognizing Popular Coalition Structures
Authors: Brandt Felix , Bullinger Martin
Published: June 2022

An important aspect of multi-agent systems concerns the formation of coalitions that are stable or optimal in some well-defined way. The notion of popularity has recently received a lot of attention in this context. A partition is popular if there is no other partition in which more agents are better off than worse off. In this paper, we study popularity, strong popularity, and mixed popularity (which is particularly attractive because existence is guaranteed by the Minimax Theorem) in a variety of coalition formation settings. Extending previous work on marriage games, we show that mixed popular partitions in roommate games can be found efficiently via linear programming and a separation oracle. This approach is quite universal, leading to efficient algorithms for verifying whether a given partition is popular and for finding strongly popular partitions (resolving an open problem). By contrast, we prove that both problems become computationally intractable when moving from coalitions of size 2 to coalitions of size 3, even when preferences are strict and globally ranked. Moreover, we show that finding popular, strongly popular, and mixed popular partitions in symmetric additively separable hedonic games and symmetric fractional hedonic games is NP-hard. Together, these results indicate strong boundaries to the tractability of popularity in both ordinal and cardinal models of hedonic games.