bluuebunny/crossref_metadata_2025 huggingface dataset:
Factores asociados a la lactancia materna en mujeres de un municipio colombiano
Authors: Orrego Celestino Luisa María , Flórez-Salazar Mateo , Revelo-Moreno Santiago , Sánchez-Ortiz Geraldine , Duque-Palacio Laura , Montoya-Martínez Juan José , Agudelo-Ramírez Alexandra
Published: April 2018

Introducción:la lactancia materna es una de las estrategias más costo-efectivas para disminuir la morbimortalidad infantil. UNICEF afirma que la Lactancia Materna Exclusiva  en la población infantil mundial fue 38%. La Encuesta Nacional de Demografía y Salud reportó que Caldas-Risaralda-Quindío tienen la menor duración de Lactancia Materna en Colombia, y la Lactancia Materna Exclusiva en Risaralda es de 2.1 meses.Identificar los factores que determinaron la adherencia y el abandono de la lactancia materna y el papel del profesional de la salud, en madres de dos comunidades de Dosquebradas, Colombia. Métodos: estudio de corte transversal sobre una muestra de 117 madres de niños a quienes a se aplicó una encuesta que indagó por aspectos biopsicosociales que impactan sobre la lactancia materna. Resultados:la  duración de la lactancia materna exclusiva tuvo una mediana de 5 meses y la complementaria una mediana de 10 meses. La principal causa de adherencia fue “es el alimento ideal” (27,9 %) y de abandono fue “poca producción de leche” (58,1 %). Los factores que impactaron significativamente la duración la lactancia materna exclusiva fueron la ocupación de la madre, incomodidad al lactar, uso de sucedáneos de la leche y tiempo de lactancia materna complementaria. El papel del profesional de salud no impactó la duración de la lactancia materna. Conclusiones: existe una amplia brecha entre lo recomendado por la Organización Mundial de la Salud y lo practicado por las comunidades.
Peculiaridades do uso da voz por professores de educação física escolar: origem e função interativa
Authors: Pedersen Vagner José , Dragone Maria Lúcia Suzigan
Published: April 2018

Introdução: Professores de educação física têm a voz como recurso de trabalho com peculiaridades que os diferenciam de outros professores: uso vocal como incentivo à atividade física de seus alunos em meio a aspectos organizacionais e ambientais diferenciados dos encontrados em sala de aula. Há poucos estudos sobre a origem histórica do uso vocal desses profissionais. Objetivo: Discorrer sobre a origem militar da educação física como determinante do estilo vocal adotado por grande parte dos professores e das peculiaridades relacionadas ao uso da voz por esses profissionais. Método: Trata-se de um artigo de revisão bibliográfica envolvendo busca de textos teóricos e documentos oficiais sobre a origem da educação física, comunicação oral e voz do professor de educação física em livros, dissertações, teses e artigos científicos específicos das áreas da Educação e da Fonoaudiologia. Resultados: Os dados encontrados salientam a característica incentivadora da voz desse profissional que busca desencadear e manter o movimento corporal dos alunos, em meio à concorrência sonora das atividades práticas e ruidosas das aulas de educação física, na maioria das vezes em ambiente de grande amplitude, ou em locais improvisados com poucas condições apropriadas ao uso vocal. Discussão: Os dados alertam para uma prática profissional com uso vocal em forte intensidade. O não reconhecimento dos professores como profissionais da voz favorece o pouco cuidado e treinamento vocal. Conclusão: Reforça-se a ideia de que professores de educação física necessitam de formação para o adequado uso da voz, tanto na graduação como no decorrer do exercício profissional.
Revista Distúrbios da Comunicação: análise dos artigos publicados nos últimos cinco anos
Authors: Ferreira Leslie Piccolotto , Santos Telma Dias dos , Barbosa Caroline Lopes , Ichitani Tatiane , Hernandez Ana Maria , Esturaro Giovana Targino , Rosa Barbara  Cristina da Silva , Trenche Maria Cecília Bonini , Mendes Beatriz  De Castro Andrade
Published: April 2018

A revista Distúrbios da Comunicação (DIC) realizou sua primeira publicação em 1986. Atualmente, está disponibilizada on-line, inserida na base de Literatura Latina Americana e do Caribe em Ciências da Saúde (LILACS) e classificada como B2 na área 21 da Coordenação de Aperfeiçoamento de Pessoal de Nível Superior (CAPES). Objetivo: analisar a publicação científica especificamente na categoria de artigos originais, nos últimos cinco anos da Revista Distúrbios da Comunicação, segundo a instituição de ensino, temática, tipo de pesquisa e descritores. Método: trata-se de estudo retrospectivo e exploratório. Foi realizado levantamento das publicações na modalidade artigo científico dos últimos cinco anos, considerando número da revista, volume, título, resumo, área temática, tipo de pesquisa (revisão de literatura, estudo observacional ou de intervenção), número de centros de pesquisa envolvidos e descritores. Resultados: foram avaliados 250 artigos e desses 19,2% das publicações pertencem às Pontifícias Universidades Católicas (São Paulo, Rio Grande do Sul e de Campinas), vindo a seguir a Universidade Federal de Santa Maria – UFSM (18,8%). Linguagem é a principal temática abordada (38,8%), 69,6% são estudos observacionais e entre os 250 primeiros descritores selecionados.  13.6% do primeiro descritor foi Fonoaudiologia e 8.8% foi Voz. Conclusão: Os dados evidenciaram que a revista DIC tem conseguido ampliar sua abrangência com participação expressiva de instituições de ensino de diferentes regiões do Brasil. Destaca-se a prevalência de artigos de linguagem e de estudos observacionais. A pesquisa constatou o uso generalizado e, portanto, equivocado do descritor Fonoaudiologia.
Diagnosis of edge condition based on force measurement during milling of composites
Authors: Felusiak Agata , Twardowski Paweł
Published: April 2018

The present paper presents comparative results of the forecasting of a cutting tool wear with the application of different methods of diagnostic deduction based on the measurement of cutting force components. The research was carried out during the milling of the Duralcan F3S.10S aluminum-ceramic composite. Prediction of the toolwear was based on one variable, two variables regression Multilayer Perceptron(MLP)and Radial Basis Function(RBF)neural networks. Forecasting the condition of the cutting tool on the basis of cutting forces has yielded very satisfactory results.
IDENTIFIKASI KARAKTERISTIK RESPON PERTUMBUHAN GENOTIPE Moringa Olifera (L) TERHADAP CEKAMAN KEKERINGAN
Authors: Wati Henny Diana
Published: April 2018

Tanaman Moringa Oleifera (L) dibudidayakan pada lahan kering yangpengairannya hanya mengandalkan dari curah hujan. Untuk mengantisipasidampak buruk dari adanya cekaman kekeringan akibat kemarau panjangdiperlukan strategi teknik budidaya yang tepat dan penggunaan varietas unggulMoringa Oleifera (L) yang toleran terhadap kekeringan. Sampai saat ini informasitentang ketahanan tanaman Moringa Oleifera (L) masih sangat terbatas. Tujuandari penelitian ini adalah untuk mengidentifikasi tingkat ketahanan beberapagenotype Moringa Oleifera(L) terhadap cekaman kekeringan. Manfaatnnyadiperoleh informasi kemungkinan adanya genotipe Moringa Oleifera (L) yangtoleran terhadap kekeringan. Penelitian ini diharapkan nantinya dapat diperolehgenotipe Moringa Oleifera (L) di Kabupaten Sumenep yang toleran terhadapkekeringan. Hasil pengamatan pada umur 120 HST terlihat bahwa komponenpertumbuhan dan produksi biomas genotipe Moringa Oleifera(L) A4.Berdasarkan data hasil pengamatan pertumbuhan, produksi dan pengujianketahanan cekaman kekeringan mengindikasikan bahwa genotipe MoringaOleifera (L) A4 paling toleran. Genotipe A4 diidentifikasi sebagai genotipe yanglebih toleran terhadap cekaman kekeringan dengan kandungan prolin 2,16. Olehkarena itu untuk pengembangan tanaman Moringa Oleifera(L) di daerah yangsering terjadi cekaman kekeringan, menggunakan genotipe MoringaOleifera(L)A4 dapat dianjurkan.
The Effect of Open- Versus Closed-Kinetic-Chain Exercises on Anterior Tibial Laxity, Strength, and Function Following Anterior Cruciate Ligament Reconstruction: A Systematic Review and Meta-analysis
Authors: Perriman Alyssa , Leahy Edmund , Semciw Adam Ivan
Published: April 2018

Background

There is controversy surrounding the early use of open-kinetic-chain (OKC) quadriceps-strengthening exercises following anterior cruciate ligament reconstruction (ACLR) due to the belief that increased strain on the graft could cause damage.

Objectives

To determine whether OKC quadriceps exercises result in differences in anterior tibial laxity, strength, function, quality of life, or adverse events in the ACLR population, when compared to closed-kinetic-chain (CKC) quadriceps exercises.

Methods

Seven electronic databases (MEDLINE, Embase, AMED, CINAHL, SPORTDiscus, PEDro, and the Cochrane Central Register of Controlled Trials) were searched through April 2017. A systematic review with meta-analysis was conducted on randomized controlled trials comparing OKC versus CKC exercises following ACLR. Outcomes of interest were tibial laxity, strength, and function. A methodological quality assessment of the included studies was completed, and the results were synthesized using meta-analysis and the Grading of Recommendations Assessment, Development and Evaluation (GRADE) approach.

Results

Ten studies were included in the review. The meta-analysis demonstrated low- to moderate-quality evidence of no between-group differences in anterior tibial laxity, strength, or patient-reported function at any time point. Meta-analysis was unable to be performed for functional outcomes.

Conclusion

There was limited to moderate-quality evidence of no difference in anterior tibial laxity, strength, patient-reported function, or physical function with early or late introduction of OKC exercises in the ACLR population, when compared to CKC exercises, at all follow-up time points.

Level of Evidence

Therapy, level 1a. J Orthop Sports Phys Ther 2018;48(7):552–566. Epub 23 Apr 2018. doi:10.2519/jospt.2018.7656
Mapeamento de processos na BU/UFSC: aplicação do framework GC@BU
Authors: Rossi Tatiana , Prim Márcia Aparecida , Bem Roberta Moraes de , Dandolini Gertrudes Aparecida
Published: April 2018

O conhecimento humano necessita ser capturado, organizado e disponibilizado para tornar-se recuperável e acessível por todos. Neste sentido, a adoção da Gestão do Conhecimento (GC) direciona ao uso de práticas que contribuem para o registro deste conhecimento, como o mapeamento de processos. A Biblioteca Universitária da Universidade Federal de Santa Catarina (BU/UFSC) desenvolve seus trabalhos com base das diretrizes da GC desde maio de 2015, quando iniciou a aplicação do Framework GC@BU, por meio de uma comissão de GC, a qual deu origem a comissão de Mapeamento de Processos. Objetiva-se apresentar a metodologia utilizada pela BU/UFSC para mapear os processos das principais atividades realizadas. São 11 processos com 79 subprocessos, desmembrados em 131 atividades, mapeados a partir da realização de um esboço, o qual é apresentado e validado pela Comissão. Após a validação e realização de ajustes necessários é desenhado o fluxograma em software específico e submetido ao mesmo processo. Para exemplificar, apresenta-se o mapeamento do processo “Empréstimo de item” e o fluxograma. Conclui-se que a receptividade e disponibilização dos servidores, trás um resultado positivo para a realização e sucesso do mapeamento de processos. Formalizando o registro das atividades obtendo a padronização, retenção do conhecimento gerado e compartilhamento do mesmo.
Pensando e repensando o documento
Authors: Gugliotta Alexandre Carlos
Published: April 2018

O presente artigo procura apresentar os principais discursos em torno do documento como objeto de pesquisa para o campo da Ciência da Informação. A partir das contribuições legadas por Paul Otlet e Suzanne Briet, várias pesquisadores passaram a desenvolver interessantes reflexões em torno do documento. Entre os pesquisadores da temática, encontramos estudos utilizam os autores clássicos da documentação – Otlet e Briet – para desenvolverem uma maior reflexão em torno das práticas dos profissionais da informação e investigações que encontram nos documentos um campo fértil para as reflexões que os observam como um construto sócio-histórico envoltos em relações de poderes que nem sempre são fáceis de serem percebidas. Conclui-se afirmando que a área da Ciência da Informação vem ganhando muito com as duas visões que unidas constroem um amplo espaço para o aprofundamento de conceitos importantes para a construção do campo científico.
Aplicação do método storytelling de gestão do conhecimento para a constituição da memória organizacional do movimento Shindo Renmei
Authors: Kajimoto Natacha , Valentim Marta Lígia Pomim
Published: April 2018

Introdução: A partir da última década do Século XIX ocorreram as primeiras relações entre o Brasil e o Japão. No Brasil a imigração japonesa teve seu início em 1908, com a vinda do navio Kasato-Maru. Com o início da Segunda Guerra Mundial, houve uma interrupção no ciclo de imigração, resultado dos ataques em Hiroshima e Nagasaki e com a rendição do Japão aos Estados Unidos. No Brasil, os imigrantes que aqui viviam não aceitavam o fato de que o Japão havia perdido a Guerra e, assim, se dividem em dois grupos – os Kachigumi [vitoristas] e os Makegumi [derrotistas]. O Movimento Shindo Renmei era constituído pelos que se denominavam Kachigumi que, por sua vez, matavam e destruíam os estabelecimentos dos japoneses que admitiam a derrota do Japão para os Estados Unidos. Objetivo: Reconstituir parte da memória do Movimento Shindo Renmei, mais especificamente referente à região de Marília, Estado de São Paulo, se faz necessário. Metodologia: Apoiando-se na gestão do conhecimento, cujos métodos possibilitam a conversão do conhecimento tácito para explícito, utilizou-se o método denominado Storytelling, com o objetivo de obter relatos de pessoas que participaram ou vivenciaram o Movimento Shindo Renmei na região de Marília, Estado de São Paulo, de modo a propiciar o resgate de parte da memória dessa organização. Resultados: Apresentam-se os relatos de 5 (cinco) pessoas que vivenciaram a época em que a Shindo Renmei atuava na região. Conclusão: O estudo realizado proporcionou a compreensão sobre a relevância do regaste da memória organizacional, neste caso a do Movimento Shindo Renmei como uma organização formal que foi constituída com objetivos muito bem definidos, bem como provou a viabilidade de se aplicar o método Storytelling da gestão do conhecimento para o resgate de memórias deste tipo.
Por uma semântica do patrimônio cultural
Authors: Gomes Ana Lúcia de Abreu
Published: April 2018

O objetivo deste artigo é discutir as inflexões semânticas do vocábulo patrimônio ao longo de sua trajetória na proteção de bens culturais no Brasil. A política de proteção dos bens culturais no Brasil se definiu durante parte significativa de sua trajetória em uma dimensão artística e histórica que desvela suas matrizes europeias, especialmente aquelas relacionadas ao campo da conservação e do restauro: de um lado uma corrente que defendia o restauro a qualquer custo, priorizando a dimensão artísticas das obras e de outro a que defendia a trajetória histórica dos bens móveis e imóveis. A ressemantização do vocábulo patrimônio presente na Constituição de 1988 indica um processo de autonomização e apropriação do campo pela sociedade brasileira.
Preservação de acervo audiovisual
Authors: Oliveira Angélica Gasparotto de
Published: April 2018

O artigo tem por objetivo apresentar informações relevantes sobre preservação fílmica, incluindo parâmetros apresentados pelo Programa Memória do Mundo da Unesco. Exemplos de catástrofes e acidentes que destruíram vários filmes, no Brasil e em outras partes do mundo, mostram o risco que corre a memória contida nesse suporte, se não tomadas as devidas medidas para sua preservação. Para que se entenda melhor tais medidas, são dadas informações sobre a composição física das películas cinematográficas. Cita-se ainda o Projeto Filmografia Baiana, coordenado por Laura Bezerra, o qual é um exemplo de preservação de filmes no Brasil. Como conclusão, assume-se que um trabalho conjunto de investimentos, tanto financeiros como de conhecimentos, pode ser feito com a união do Estado e de profissionais da informação.
Preservação de documentos especiais
Authors: Manini Miriam Paula
Published: April 2018

Este artigo é, antes de tudo, um “manual de primeiros socorros” para profissionais ou interessados que trabalham com acervos compostos por uma diversidade grande de espécies documentais. As informações são fruto de pesquisa bibliográfica e de experiência de trabalho em acervos múltiplos. São abordadas espécies documentais presentes em acervos desde muito antes do advento do digital. São abordadas questões especificamente ligadas aos suportes materiais da informação e não aos seus conteúdos. A parte referente à preservação fotográfica – a mais extensa e importante – é baseada na formação junto ao Centro de Conservação e Preservação Fotográfica, da Fundação Nacional de Arte, no Rio de Janeiro. Os demais materiais (películas, fitas de vídeo e de áudio, discos, objetos e disquetes, entre outros) são abordados de maneira mais econômica pela escassez de informações encontradas. A parte final, Controvérsias Preciosas, é quase um apêndice, que reúne as principais discussões da área que causam dúvidas de qual o melhor procedimento a adotar.
Assessing The Effects Of Climate Change On Sea Level Rise Along The Gulf Of Guinea
Authors: Eric Mortey Caleb Mensah Amos T. Kabo-bah
Published: April 2018

The sea level is rising due to global warming in response, by and large, to anthropogenic activities. Coastal communities along the Gulf of Guinea are low lying which makes them more vulnerable to rising sea level. Due to the topography of the Gulf of Guinea, the coastal belt is a highly erosive sandy barrier system that is susceptible to flooding. In West Africa, highlyproductive ecosystem like mangroves, estuaries, and deltas, that form the vital socio-economic activities like trade, tourism, fisheries and industrial growth due to the oil and gas development are found in these coastal communities. Therefore, majority of the population in West Africa who live in these mega cities along the coast face possible threats. Thus, climate adaptation is the only option to address these future threats as reduction in the emission of carbon dioxide (CO2) and other green house gases is not enough for now to prevent global warming which leads to sea level rise. Thus, this study seeks to investigate from other research works, how sea level rise has affected these coastal communities along the Gulf of Guinea and how the communities are adapting to these challenges to new ways of living. It concludes with a recommendation on a climate change based framework.
Assessment of locally produced waxing materials on the shelf life and fruit quality of two tomato varieties (Solanum lycopersicum)
Authors: J. O. Anim R. Osae G. Essilfie
Published: April 2018

The study was conducted to assess the effect of different waxing materials on the quality attributes of tomato fruits. A 2 x8 factorial experiment layout in complete randomized design with 16 treatment combinations and 3 replication was adopted.The materials that were used for the experiment are two (2) varieties of tomatoes (Pectomech and Power Rano) and seven(7) waxing material (shea butter, cassava starch, beeswax, and a combination of shea butter + cassava starch, shea butter + beeswax, cassava starch + beeswax, shea butter + cassava starch + beeswax) and a control. Results from the experiment indicated that all waxing treatments delayed the development of weight loss, firmness, pH, total soluble solids, and total titrable acidity. The results also suggested that edible wax coatings delayed the ripening process and colour development of tomato fruits during the storage period and extended the shelf life. However Beewax treatment and its combinations performed better than the other treatments. It was therefore recommended that locally produced wax such as Beewax, Shea butter, Cassava Starch treatments and their combinations could be a good technology for preserving the quality and extending the shelf life of fresh tomato fruit as well as maintaining the physical and chemical properties.
Planning Optimal Path Networks Using Dynamic Behavioral Modeling
Authors: Kudinov Sergei , Smirnov Egor , Malyshev Gavriil , Khodnenko Ivan
Published: April 2018

Mistakes in pedestrian infrastructure design in modern cities decrease transfer comfort for people, impact greenery due to appearance of desire paths, and thus increase the amount of dust in the air because of open ground. These mistakes can be avoided if optimal path networks are created considering behavioral aspects of pedestrian traffic, which is a challenge. In this article, we introduce Ant Road Planner, a new method of computer simulation for estimation and creation of optimal path networks which not only considers pedestrians' behavior but also helps minimize the total length of the paths so that the area is used more efficiently. The method, which includes a modeling algorithm and its software implementation with a user-friendly web interface, makes it possible to predict pedestrian networks for new territories with high precision and detect problematic areas in existing networks. The algorithm was successfully tested on real territories and proved its potential as a decision making support system for urban planners.
PENGARUH KOMPOS TERHADAP HASIL PANEN TOMAT (Lycopersicum esculentum Mill)
Authors: Rakun Ahmad , Mertha I Gde
Published: April 2018

Penelitian tentang pengaruh kompos terhadap hasil panen tomat, telah dilaksanakan di Desa Montong Are Kabupaten Lombok Barat. Tujuan dilaksanakannya penelitian ini adalahÃÂ  untuk mengetahui: (1) pengaruh pemberian komposÃÂ  terhadap hasil panen tomat pada lahan pertanian Desa Montong Are, (2) dosis kompos yang perlu diberikanÃÂ  pada lahan pertanian Desa Montong Are agar tomat dapat berproduksi secara optimal. Dalam penelitian ini digunakan rancangan acak lengkapÃÂ  dengan enam ulangan. Data penelitian dianalisis dengan analisis sidik ragam dan uji lanjut dengan Uji Beda Nyata Terkecil (BNT). Hasil penelitian ÃÂ menunjukkan bahwa (1) aplikasi kompos pada lahan pertanian Desa Montong berpengaruh signifikan terhadap hasil panen tomat, (2) kadar optimum kompos yang perlu diberikan pada lahan pertanian Desa Montong Are agar tomat berproduksi secara optimal adalah 1,2 kg untuk setiap 10 kg tanahStudy on the influence of compost on the yield of tomato was carried out in Montong Are Village West Lombok. The objective of this researchÃÂ are: (1) to identify the effect of the use of compost on the yield of tomato, (2) to identify the optimum dosage of compost that must be added to the soil ofÃÂ  Montong Are farmland in order that tomato can product optimally. Completely randomized design with six replicates was used in this research. Data analysis withÃÂ AnovaÃÂ and least significant difference test (LSD).The result of this research are: (1) the application of compost has a significant effect on the yield of tomato, (2)ÃÂ  the optimum dosage of compost that must be given to the soil ofÃÂ  Montong Are farmland in order that tomato can product optimally is 1.2 kg compost/10 kg soil.ÃÂ
Determination of Antioxidants in Fruit Tissues from Three Accessions of Habanero Pepper (Capsicum chinense Jacq.)
Authors: Castro-Concha Lizbeth A. , Canche-Chuc Ismael , Miranda-Ham María de Lourdes
Published: April 2018

Three accessions of habanero pepper (Capsicum chinense Jacq.), differing in the color of the fruits throughout the maturation process, were analyzed for antioxidants, namely carotenoids, ascorbate and glutathione. The mature fruits from the three accessions contained high levels of the above mentioned antioxidants. Accession MR8H presented the highest content of red carotenoids, while in SBN01, the ascorbate level was the maximal found regardless of the maturation stage.
Identification of Proteins from Cap-Binding Complexes by Mass Spectrometry During Maize (Zea mays L.) Germination
Authors: Lázaro-Mixteco Pedro E. , Dinkova Tzvetanka D.
Published: April 2018

This work describes the identification of components in the Cap-binding complexes in non-germinated and 24-h-imbibed seeds using mass spectrometry. This approach revealed new components particularly present in the non-germinated seed. Among these, two heat shock proteins, HSP101 and HSP70, were detected as well as several proteins involved in carbohydrate metabolism. Between the new components of maize Cap-binding complexes, several proteins contain a motif that identifies them as potential direct interactors with eIF4E or eIF(iso)4E.Together with the major abundance of eIF(iso)4E at this developmental stage, our findings indicate clear differences between the translation initiation complexes that are available for protein synthesis right upon water imibition and those that are present once germination has been completed.
2D and 3D Supramolecular Structures of trans- and cis-Octahedral Coordination Compounds of Ethyl-5-methyl-4-imidazolecarboxylate with Transition Metal Ions
Authors: Barrera-Guzmán Víctor Adán , Ramírez-Trejo Raúl , Rodríguez-Hernández Edgar Omar , Barba- Behrens Noráh
Published: April 2018

Ethyl-5-methyl-4-imidazolecarboxylate (emizco) is an important intermediate in the synthesis of pharmacological active compounds. In this work, there were synthetized and characterized the following coordination compounds with emizco: trans-[Co(emizco)2(H2O)2](NO3)2 1, trans-[Ni(emizco)2(H2O)2](NO3)2 2, trans-[Cd(emizco)2(H2O)2](NO3)2 (3) and cis-[Cd(emizco)2Br2] (4). 2D or 3D supramolecular arrangements were stabilized. All nitrate trans octahedral compounds stabilized a 3D supramolecular arrangement via hydrogen bonding, throughout the nitrate anions, the ligand and the coordinated water molecules; the cis-octahedral halide complex formed a 2D pleated sheet arrangement, by intermolecular π stacking and halide-hydrogen bonding.
Allosteric Regulation of the Photosynthetic C4 Isoenzyme of Phosphoenolpyruvate Carboxylase: A Comparative Study Between Enzymes from Monocot and Dicot Plants
Authors: Güémez-Toro Rodrigo , Mújica-Jiménez Carlos , Muñoz-Clares Rosario A.
Published: April 2018

In the present study, we have investigated the complex allosteric regulation of the non-phosphorylated forms of the photosynthetic phosphoenolpyruvate carboxylase isoenzymes (PEPC-C4) from amaranth (AhPEPC-C4) and maize (ZmPEPC-C4) leaves. Previous studies showed that glycine (Gly) only activates PEPC-C4 from monocot plants, as maize, but not from dicot plants, as amaranth. Our initial velocity data confirm this, in spite that AhPEPC-C4 binds Gly with much higher affinity than ZmPEPC-C4. In AhPEPC-C4, the lack of Gly activation is overcome mainly by its higher affinity for the substrate phosphoenolpyruvate and its lower affinity for the inhibitor malate compared with ZmPEPC-C4. We have also explored the structural determinants of the differences in Gly activation by performing multiple alignments between the known monocot and dicot PEPC-C4 sequences and by modeling, in both the AhPEPC-C4 and ZmPEPC-C4 isoenzymes, the three-dimensional structure of the loop proposed as the Gly binding site, which was not observed in the crystal structure of the maize enzyme due to its high flexibility. The models suggest that conserved lysyl and aspartyl residues are important for binding to the activator molecule, and that a nearby non-conserved residue may be responsible for differences between the amaranth and maize enzymes in the loop conformation, which would account for the poorer affinity for Gly of the maize enzyme as well as for its higher degree of activation.
Evaluation of the Extracellular Proteome Profile During the Somatic Embryogenesis Process of Coffea spp.
Authors: Mukul-López Héctor Gabriel , De-la-Peña Clelia , Galaz-Ávalos Rosa María , Loyola-Vargas Víctor Manuel
Published: April 2018

The somatic embryogenesis (SE) has been used as an important tool for the study of molecular events in plant cell differentiation. Some studies have revealed that suspensions of somatic embryos secrete a vast array of proteins that could be involved in the regulation of this process. Many of these molecules have been suggested to work as inductors and others as inhibitors of the process. In the present work, suspension cultures of both Coffea canephora and Coffea arabica were used to study the population of proteins secreted into the media. Two types of cultures were used; one for the propagation of suspension cultures (non-embryogenic) and another for the induction of SE (embryogenic). The evaluated days were 14 and 42 for non-embryogenic condition and 21, 42, and 98 for the embryogenic condition. An embryogenic system was established in the C. arabica species, obtaining 4,000 embryos per liter. We analyzed the proteins secreted into the culture media, both under non-embryogenic and SE induction conditions. In C. canephora medium, we found 173 proteins after 14 d of culture under non-embryogenic conditions. In C. arabica we found 523 after 14 d under non-embryogenic conditions. Under embryogenic conditions we found 379, 409 and 175 proteins after 21, 42 and 98 d, respectively. We also determined that some proteins are secreted exclusively under embryogenic conditions and others proteins under non-embryogenic conditions.
Numerical Simulation of the Behaviors of the Bray-Liebhafsky Oscillating Chemical Reaction by a Four-variable Model
Authors: Ren Jie , Gao Jinzhang , Yang Wu
Published: April 2018

Based on a ten-step chemical model involving the concentrations of I2(aq), O2(aq), and the intermediates of I- and HIO2, four independent variables and seven irreversible steps, the nonlinear behavior of Bray-Liebhafsky (BL) oscillating reaction was investigated. The results showed that with different values of initial concentrations of reactants in the process of simulation, both periodic oscillation and chaotic behavior could be observed. In addition, at the same initial concentrations and rate constants, the system becomes more and more regular after being chaos. That is to say, the translation from chaos to periodic oscillation at the same initial conditions appeared in the BL system. The nonlinear behavior of system was also investigated briefly
Effect of the Ligand in the Synthesis of 1-Sulfonyl-1,2,3-triazoles Through Copper-Catalyzed Alkyne-Azide Cycloaddition
Authors: Valencia Rocío A. , Corona David , Cuevas-Yañez Erick
Published: April 2018

Copper-catalyzed alkyne-azide cycloaddition of p-toluenesulfonylazide and phenylacetylene was investigated, using catalytic amounts of copper (I) chloride and diverse additives which were tested as copper ligands. The best results were obtained using a catalytic amount of diphenyl disulfide
Towards the Bioassay Activity Landscape Modeling in Compound Databases
Authors: Medina-Franco José Luis , Waddell Jacob
Published: April 2018

Public compound databases annotated with biological activity are increasingly being used in drug discovery programs. A prominent example is of such databases is PubChem. Herein, we introduce an approach to systematically characterize the structure-bioassay activity relationships in PubChem using the concept of bioassay activity landscape. This strategy is general and can be applied to any data set screened across multiple bioassays. We also present a visual representation of the chemical space of an in-house data set using a recently developed web-based public tool.
Structural and Compositional Optimization of the LiNi0.8Co0.2O2 Electrode by New Synthesis Conditions
Authors: Mosqueda Laffita Yodalgis , Milian Pila Carlos. R. , Pomares Alfonso Mario , Rodríguez Hernández Joelis , Pérez Cappe Eduardo
Published: April 2018

The optimization of Citrate Precursor Method to obtain the LiNi0.8Co0.2O2 oxide from the thermal decomposition of the citrate precursor (NH4)3LiNi0.8Co0.2(C6H5O7) is presented. The optimization procedure consists of both the lithium atmosphere and the reaction time control during the decomposition of the citrate precursor. Were obtained and characterized two kind of the (Li1-xNix)(Ni0.8Co0.2)O2 oxides, with and without optimized synthesis conditions, identified as A and B oxides, respectively. The A and B oxides are characterized by compositional, structural and electrochemical studies. The results showed that is possible to reach the ordered oxide phase at smaller reaction time if the lithium atmosphere is controlled. From the combination of the chemical analysis by ICP and the DRX Rietveld structural refinement it is possible to establish the Li, Ni(II), Ni(III) and Co(III) composition with great accuracy. The resulted structural and compositional transformations have a close relation with technological parameters of the rechargeable lithium battery using Li Ni0.8Co0.2O2 oxide as cathode.
Reaction of o-Aminobenzamides with Dialkyl Carbonates and Ionic Liquids: A Novel one-pot, High-yield, Microwave-assisted Synthesis of 1-Alkylquinazoline-2,4-diones
Authors: Guerrero R. Leticia , Rivero Ignacio A.
Published: April 2018

A simple and efficient methodology for the synthesis of 1-alkyl-2,4-(1H,3H)-quinazolinediones from o-aminobenzamides has been developed. The novel one-pot cyclization-alkylation reactions are easier and faster than any other reported protocols and resulted in excellent yields (96-98%) and high purities, making this methodology suitable for library synthesis in drug discovery efforts. By applying microwave irradiation at 130 °C and in the presence of ionic liquids, dimethyl or diethyl carbonates simultaneously act as carbonylating and alkylating agents.
Qualitative Investigation on some H-bonded Interpolymer Complexes by Determination of Thermodynamic Parameters
Authors: Vasheghani Farahani Bahman , Rajabi Farzaneh Hosseinpour , Hoseein Ahmadi Mohammad , Zenooz Naser
Published: April 2018

Qualitative analysis for stability of some hydrogen bonded interpolymer complexes of poly (acrylic acid) with non ionic polymers such as poly (methacryl amide) (PMAm), poly (vinyl pyrrolidon) (PVP), poly (ethylene oxide) (PEO) and poly (ethylene glycol) (PEG), has been done by determining the stability constant (K) and thermodynamic parameters (e.g. ΔH0 and ΔS0) of these complexes at several temperatures. The comparative studies indicate considerable difference in the values of these parameters. They can be explained on the basis of influence of other interacting forces such as hydrophobic and ion dipole interactions during interpolymer complex formation. It has been found that the stability of H-bonding interpolymer complex is greatly enhanced by these two factors.
Do Casiopeinas® Prevent Cancer Disease by Acting as Antiradicals? A Chemical Reactivity Study Applying Density Functional Theory
Authors: Avelar Mayra , Martínez Ana
Published: April 2018

The main goal of this investigation is to study the possible mechanisms of Casiopeinas® as anticancer agents. Electrodonating (χ-) and electroaccepting (χ+) electronegativity were calculated applying Density Functional Theory. Two different anticancer mechanisms of Casiopeínas® are proposed. There might be antiradical molecules preventing the formation of cancer cells or these molecules could reduce the amount of GSH and as a result over-produce free radicals, increasing the oxidative stress which in turn kills the cancer cells.
The Storage of Hydrogen in Nanoporous Carbons
Authors: Alonso Julio A. , Cabria Iván , López María J.
Published: April 2018

An efficient storage of hydrogen is a crucial requirement for its use as a fuel in the cars of the future. Experimental and theoretical work has revealed that porous carbons are promising materials for storing molecular hydrogen, adsorbed on the surfaces of the pores. The microstructure of porous carbons is not well known, and we have investigated a class of porous carbons, the carbide-derived carbons, by computer simulation, showing that these materials exhibit a structure of connected pores of nanometric size, with graphitic-like walls. We then apply a thermodynamical model of hydrogen storage in planar and curved pores. The model accounts for the quantum effects of the motion of the molecules in the confining potential of the pores. The optimal pore sizes yielding the highest storage capacities depend mainly on the shape of the pore, and slightly on temperature and pressure. At 300 K and 10 MPa, the optimal widths of the pores lie in the range 6-10 Å. The theoretical predictions are consistent with experiments for activated carbons. The calculated storage capacities of those materials at room temperature fall below the targets. This is a consequence of an insufficiently strong attractive interaction between the hydrogen molecules and the walls of carbon pores. Recent work indicates the beneficial effect of metallic doping of the porous carbons in enhancing the binding energy of H2 to the pore walls, and then the hydrogen storage.
Theoretical quantum study about the adsorption of BH4 - onto X(100) where (X = Cu, Ag and Au)
Authors: Mendoza-Huizar Luis Humberto , García Rodríguez Diana Elizabeth , Rios-Reyes Clara Hilda , Alatorre-Ordaz Alejandro
Published: April 2018

In present work we analyzed some electronic properties involved during the adsorption of BH4- on Cu(100), Ag(100) and Au(100) surfaces. Reactivity descriptors such as ionization energy, hardness, electrophilicity, frontier molecular orbitals, condensed Fukui function, adsorption energies and density of states were calculated to identify changes in the reactivity on Cu(100), Ag(100) and Au(100). The results suggest the BH4- adsorption is favored on Cu(100) more than on Ag(100) or Au(100). The BH4- -Au(100) system showed higher values of μ and ω in comparison with BH4- -Ag(100) and BH4- -Cu(100) systems. Last results suggest that gold is a better electron acceptor in comparison with silver and copper. Also, the fraction of electrons transferred during the BH4- adsorption was calculated indicating a bigger electron transfer from BH4- to Cu(100) compared to Au and Ag.
Rate Constants and Branching Ratios in the Oxidation of Aliphatic Aldehydes by OH Radicals under Atmospheric Conditions
Authors: Castañeda Romina , Iuga Cristina , Álvarez-Idaboy J. Raúl , Vivier-Bunge Annik
Published: April 2018

In this work, a theoretical study is presented on the mechanism of OH reactions with C1-C5 aliphatic aldehydes. We have shown that, starting from butanal, the Cβ H-abstraction channel becomes relatively important and it contributes moderately to the total rate constant. Calculated overall rate coefficients at the CCSD(T)/6-311++G**//BHandHLYP/6-311++G** level are in excellent agreement with experimental data, supporting the proposed mechanisms. Negative activation energies are found to be in agreement with the temperature dependence observed for aldehydes. The branching ratio between the aldehydic and Cβ hydrogen abstraction is not significantly modified as temperature increases from 230 to 330 K.
Auxiliary Density Perturbation Theory for Restricted Open-Shell Systems
Authors: Guzmán-Ramírez Gregorio , Tenorio Francisco José , Rodríguez-Zavala Jaime Gustavo , Flores-Moreno Roberto
Published: April 2018

The recently developed approach to auxiliary density perturbation theory (J. Chem. Phys. 2008, 128, 134105) for the purpose of calculating molecular properties is here extended to include open-shell systems. Both unrestricted and restricted formalisms are considered. A linear equation system, twice as large as the auxiliary function set is obtained in both cases. For the first time, the formulation for auxiliary density perturbation theory for restricted open-shell formalism is derived.
GGA/PBE study of the spin isomers of Fe34,40, Co23,34, and Co12Cu Clusters with Selected Geometries
Authors: Aguilera-Granja Faustino , Vega Andrés , Balbás Luis Carlos
Published: April 2018

In a recent beam deflecting experiment was found that high and low spin states of pure Fen and Con clusters with n ≤ 300 atoms coexist at cryogenic temperatures. In this work we have studied the high spin (HS) and low spin (LS) states of several structural isomers of Co23, Co34, Fe34, and Fe40 using the generalized gradient approximation (GGA) to density functional theory as implemented in the first-principles pseudo-potential code SIESTA. The calculated energy difference between these HS and LS isomers is not consistent with the observed coexistence, which can be due to an insufficient account of many body correlation effects in the GGA description, or to unknown isomer structures of these clusters. We have calculated within the same tools the magnetic isomers of Co12Cu cluster aimed to re-visit a former DFT prediction of an anti-ferromagnetic ground state. We find, however, a ferromagnetic ground state as expected on physical grounds. Our results exemplify the difficulties of the current DFT approaches to describe the magnetic properties of transition metal systems.
Kinetic Spectrophotometric Method for the Estimation of Ofloxacin in Pharmaceutical Formulations
Authors: Kishore Lalit , Kumar Ashok , Nair Anroop , Kaur Navpreet
Published: April 2018

The objective of the current study was to develop a direct, sensitive spectrophotometric method based on the oxidation of Ofloxacin using potassium permanganate in alkaline medium. The rate of change of absorbance was measured at 603 nm. The initial rate method and fixed time method (at 4 min) are utilised to construct calibration graphs for calculating the concentration of the drug. The results were validated through inter day and intraday precision assays according to the ICH guidelines and also through recovery studies. Statistical comparison of the proposed methods with that of reference method shows excellent agreement and indicates no significant difference in their accuracy and precision.
Synthesis of Some Novel Derivatives of 2-(9H-purin-6-ylsulfanyl) Acetohydrazide as Potential Antithyroid Agents
Authors: Fatima Ismat , Munawar Munawar A. , Nasir Waqar , Khan Misbahul A. , Tasneem Affia , Fatima Tauqir , Adil Muhammad R.
Published: April 2018

Some novel derivatives of 2-(9H-Purin-6-ylsulfanyl)acetohydrazide were synthesized by reacting it with respective aldehydes in ethanol. The antithyroid effect of these compounds was ascertained in vitro by studying their complexation with iodine spectrophotometrically. In vivo, the hormonal as well as histological variations in male Wistar rats demonstrated significant antithyroid potential (p ≤ 0.05) of these compounds.
Traditional Methods for Whey Protein Isolation and Concentration: Effects on Nutritional Properties and Biological Activity
Authors: Tovar Jiménez Xóchitl , Arana Cuenca Ainhoa , Téllez Jurado Alejandro , Abreu Corona Arturo , Muro Urista Claudia Rosario
Published: April 2018

Traditional methods used for concentration of whey proteins have various levels of performance and effects on the nutritional properties and biological activities of the products. In this study, we showed that the greatest protein content was obtained using ultrafiltration and salt treatment methods. The effective concentration was approximately 40-53% (w/w) protein. Using electrophoresis and solubility tests, we also found that these methods offer the fundamental advantage of maintaining certain proteins in their native states. The products maintained key ABTS•+ radical scavenging activity; however, the antimicrobial activity was adversely affected by these separation methods.
Chemical Hydrolysis of the Polysaccharides of the Tamarind Seed
Authors: González-Hernández Juan Carlos , Farías Rosales Lorena , Zamudio Jaramillo Miguel Ángel , Álvarez-Navarrete Mariana , Vera Villa Juan Carlos , Martínez Corona Ricardo , Chávez-Parga Ma. del Carmen , Peña Antonio
Published: April 2018

Biotechnological processes with lignocellulose materials are promising technologies for the production of chemicals and energy involving the same main production stages: hydrolysis of the hemicellulose and the cellulose to monomeric sugars, fermentation, recovery of the product, and concentration. We studied the effect of different treatments on the release of reducing sugars (RS) from seeds. Three factors were tested: temperature from 86 to 130.2 °C; acid concentration, 0.32 to 3.68% (v/v); and exposure time, from 13.2 to 40 min. Two acids were tested. Temperature and time were the factors that had more effect on hydrolysis, whereas no interactions between factors had a significant effect on the release of RS. The best conditions for RS release were for both acids (2% v/v), 130.2 °C, and 30 min, with a concentration of about 110 g/L. Results suggest tamarind seed is a feasible option for xylitol production.
Regioselective Ring Opening of Epoxides with Amines Using Silica-bonded S-sulfonic Acid under Solvent-free Conditions
Authors: Tajbakhsh Mahmood , Hosseinzadeh Rahman , Rezaee Parizad , Alinezhad Heshmatollah
Published: April 2018

Silica-bonded S-sulfonic acid (SBSSA) was used as a recyclable and reusable catalyst for the synthesis of β-amino alcohols. Several amines were reacted with epoxides to afford regioselective β-amino alcohols in high yield under solvent-free conditions at room temperature.
Studies on the Development of New Efficient Corrosion Inhibitors for Crude Oil Pipelines: Electrochemical Impedance Spectroscopy Results for 1,8-Naphthyridines
Authors: Álvarez-Manzo Rodolfo , Mendoza-Canales Joel , Castillo-Cervantes Salvador , Marín-Cruz Jesús
Published: April 2018

Five 1,8-naphthyridines were tested as corrosion inhibitors, including three non-previously reported 3-alkyl-1,8-naphthyridines. All were produced via the extended Friedländer synthesis, that for 3-alkyl-1,8-naphthyridines involves the earliest use of aliphatic aldehydes. Fragmentation pattern in MS for 3-alkyl-1,8-naphthyridines shows a remarkable parallel with that exhibited by 3-alkylpyridines. Electrochemical Impedance Spectroscopy (EIS) was used to assess the inhibiting properties of these compounds on samples of API X52 carbon steel pipelines immersed in oilfield-related water. Except for one of the molecules tested, the inhibition  efficiency (IE%) values were significantly higher than that calculated for a reference commercial inhibitor.
Catalytic Properties of Pure and K+-Doped CuO/MgO System Towards 2-Propanol Conversion
Authors: El-Molla Sahar A. , El-Shobaky Gamil A. , Amin Nabil H. , Hammed Mohamed N. , Sultan Sahar N.
Published: April 2018

CuO/MgO system having different compositions was prepared by impregnation method followed by calcination at 400-900 °C. The effect of CuO content, calcination temperature and doping with small amounts of K+ species (1-3 mol %) on physicochemical, surface and catalytic properties of the system were investigated using XRD, adsorption of N2 at -196 °C, and conversion of isopropyl alcohol at 150-400 °C using a flow technique. The results revealed that the solids having the formulae 0.2 and 0.3 CuO/MgO calcined at 400 °C consisted of nanosized MgO and CuO as major phases together with Cu2O as minor phase. The BET-surface areas of different adsorbents are decreased by increasing CuO content, calcination temperature and K+- doping. MgO-support material showed very small catalytic activity in 2-propanol conversion. The investigated system behaved as selective catalyst for dehydrogenation of 2-propanol with selectivity > 80%. The catalytic activity increased by increasing CuO content and decreased by increasing the calcination temperature within 400-900 °C. K+ - doping increased the catalytic activity and catalytic durability.