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... Sir Henry Digby-Beste, Obituary, Dr. San Tiago Dantas Turbulent Politics Of Brazil, Sir Geoffrey Layton Naval ... New Contracts, U.K. Optical 1-For-2, Nelson Trust Capital Proposals, $18M. Cubitt Group Orders, Glasgow ...
1964 - Gale Group | TDA
Lucı́lia Domingues, Maria M. Dantas, Nelson Lima, J. A. Teixeira,
Alcohol fermentation of lactose was investigated using a recombinant flocculating Saccharomyces cerevisiae, expressing the LAC4 (coding for β-galactosidase) and LAC12 (coding for lactose permease) genes of Kluyveromyces marxianus. Data on yeast fermentation and growth on a medium containing lactose as the sole carbon source are presented. In the range of studied lactose concentrations, total lactose consumption was observed with a conversion yield of ethanol close to the expected theoretical value. ...
Tópico(s): Microbial Metabolic Engineering and Bioproduction
1999 - Wiley | Biotechnology and Bioengineering
Produção Nacional
Revisado por pares
Layla L. L. Rocha, André Luís Dantas Ramos, Nelson Roberto Antoniosi Filho, Nelson C. Furtado, Carlton A. Taft, Donato Alexandre Gomes Aranda,
In this work niobium oxide is used as catalyst for both hydrolysis and esterification steps in biodiesel production. Soybean and castor oils were the raw materials and the reactions were conducted in a batch reactor, analyzing the effect of temperature (250-300°C for hydrolysis, 150-200°C for esterification), water/oil and methanol/fatty acid molar ratios (5-20 for hydrolysis, 1.2-3 for esterification) and catalysts concentration (0-20% w/w for both reactions), according to an experimental plan (23). ...
Tópico(s): Lubricants and Their Additives
2010 - Bentham Science Publishers | Letters in Organic Chemistry
Produção Nacional
Amanda Dantas de Oliveira, Nelson M. Larocca, Luiz Antônio Pessan,
Blendas de poliamida 6 (PA6) com acrilonitrila-butadieno-estireno (ABS) foram preparadas em uma extrusora de rosca dupla, utilizando-se o copolímero estireno-anidrido maleico (SMA), com 7% de anidrido maleico, como compatibilizante. O efeito de três sequências de mistura na microestrutura e propriedades das blendas foi estudado. A morfologia e as propriedades mecânicas dos materiais foram caracterizadas por microscopia eletrônica de transmissão (MET) e testes de resistência ao impacto e módulo de elasticidade, ...
Tópico(s): Tribology and Wear Analysis
2011 - Associação Brasileira de Polímeros | Polímeros
Produção Nacional
Revisado por pares
Amanda Dantas de Oliveira, Nelson M. Larocca, D. R. Paul, Luiz Antônio Pessan,
Abstract Toughening of polyamide 6 (PA6) can be achieved by appropriate addition of an elastomeric matrix phase; however, this leads to a loss of rigidity and mechanical strength. As a result, much research has been directed at obtaining an optimal balance between toughness and rigidity for these thermoplastics. The approach explored here is the formation of nanocomposites from PA6/acrylonitrile–butadiene–styrene (ABS) blends prepared by melt mixing with a modified montmorillonite (Cloisite® 30B) and ...
Tópico(s): biodegradable polymer synthesis and properties
2012 - Wiley | Polymer Engineering and Science
Produção Nacional
Revisado por pares
Henrique Dantas de Menezes, Nelson Sidnei Massola Júnior, Stephan D. Flint, Geraldo José da Silva, Luciano Bachmann, Drauzio E.N. Rangel, Gilberto Úbida Leite Braga,
Light conditions can influence fungal development. Some spectral wavebands can induce conidial production, whereas others can kill the conidia, reducing the population size and limiting dispersal. The plant pathogenic fungus Colletotrichum acutatum causes anthracnose in several crops. During the asexual stage on the host plant, Colletototrichum produces acervuli with abundant mucilage-embedded conidia. These conidia are responsible for fungal dispersal and host infection. This study examined the ...
Tópico(s): Biocrusts and Microbial Ecology
2014 - Wiley | Photochemistry and Photobiology
Eliah Overbey, JangKeun Kim, Braden Tierney, Jiwoon Park, Nadia Houerbi, Alexander G. Lucaci, S. Medina, Namita Damle, Deena Najjar, Kirill Grigorev, Evan E. Afshin, Krista Ryon, Karolina Sienkiewicz, Laura Pătraș, Rémi Klotz, Veronica Ortiz, Matthew MacKay, Annalise Schweickart, Christopher R. Chin, Maria A. Sierra, Matías Fuentealba, Ezequiel Dantas, Theodore M. Nelson, Egle Cekanaviciute, Gabriel Deards, Jonathan Foox, S Narayanan, Caleb M. Schmidt, Michael A. Schmidt, Julian C. Schmidt, Sean Mullane, Seth Stravers Tigchelaar, Steven Levitte, Craig Westover, Chandrima Bhattacharya, Serena Lucotti, Jeremy Wain Hirschberg, Jacqueline Proszynski, Marissa Burke, Ashley S. Kleinman, Daniel Butler, Conor J. Loy, Omary Mzava, Joan Sesing Lenz, Doru Paul, Christopher Mozsary, Lauren Sanders, Lynn Taylor, Chintan Patel, Sharib Khan, Mir Suhail Mohamad, Syed Gufran Ahmad Byhaqui, Burhan Aslam, Aaron S. Gajadhar, Lucy Williamson, Purvi Tandel, Qiu Yang, Jessica Chu, Ryan W. Benz, Asim Siddiqui, Daniel Hornburg, Kelly Blease, Juan Carlos Moreno‐Piraján, Andrew M. Boddicker, Junhua Zhao, Bryan R. Lajoie, Ryan T. Scott, Rachel Gilbert, San-Huei Lai Polo, Andrew Altomare, Semyon Kruglyak, Shawn Levy, Ishara S. Ariyapala, Joanne C. Beer, Bingqing Zhang, Briana M. Hudson, Aric B.E. Rininger, Sarah E. Church, Afshin Beheshti, George M. Church, Scott M. Smith, Brian Crucian, Sara R. Zwart, Irina Matei, David Lyden, Francine E. Garrett-Bakelman, Jan Krumsiek, Qiuying Chen, Dawson Miller, Joe Shuga, Steve Williams, Corey M. Nemec, Guy Trudel, Martin Pelchat, Odette Laneuville, Iwijn De Vlaminck, Steven S. Gross, Kelly L. Bolton, Susan M. Bailey, Richard D. Granstein, David Furman, Ari Melnick, Sylvain V. Costes, Bader Shirah, Min Yu, Anil Menon, Jaime Mateus, Cem Meydan, Christopher E. Mason,
Spaceflight induces molecular, cellular and physiological shifts in astronauts and poses myriad biomedical challenges to the human body, which are becoming increasingly relevant as more humans venture into space
Tópico(s): Health, Environment, Cognitive Aging
2024 - Nature Portfolio | Nature
Lucı́lia Domingues, Maria M. Dantas, Nelson Lima, J. A. Teixeira,
Alcohol fermentation of lactose was investigated using a recombinant flocculating Saccharomyces cerevisiae, expressing the LAC4 (coding for -galactosidase) and LAC12 (coding for lactose permease) genes of Kluyveromyces marxianus.Data on yeast fermentation and growth on a medium containing lactose as the sole carbon source are presented.In the range of studied lactose concentrations, total lactose consumption was observed with a conversion yield of ethanol close to the expected theoretical value.For ...
Tópico(s): Fermentation and Sensory Analysis
1999 - Wiley | Biotechnology and Bioengineering
Produção Nacional
Revisado por pares
Lucely Nogueira dos Santos, Alberdan Silva Santos, Kelly das Graças Fernandes Dantas, Nelson Rosa Ferreira,
Cachaça (sugar cane spirit) is a typically Brazilian distilled beverage. Copper ions can be present in craft beverages despite their acceptance in the national and international market. This study aims to evaluate the efficiency of chitosan as an adsorbent in removing copper (II) from cachaça. The structural characteristics of the obtained chitosan and the effect of adsorbed copper were evaluated by Fourier Transform Infrared Spectroscopy (ATR-FTIR), viscosimetry, X-ray diffraction (XRD), and scanning ...
Tópico(s): Adsorption and biosorption for pollutant removal
2022 - Multidisciplinary Digital Publishing Institute | Polymers
Produção Nacional
Annete de Jesus Boari Lima, Angelita Duarte Corrêa, A.M. Dantas-Barros, David Lee Nelson, Ana Carolina L. Amorim,
The aim of this work was to determine the sugar, organic acid and mineral compositions of the whole fruit and fractions (skin, pulp and seed) of the Paulista (Plinia cauliflora) and Sabará (Plinia jaboticaba) jabuticaba tree genotypes, as well as the oil compositions of their skin and seeds. High levels of sugar, especially fructose, followed by glucose and sucrose, were encountered in the fruit. In the Paulista genotype, higher levels of total and reducing sugars were found in the pulp and skin, which ...
Tópico(s): Psidium guajava Extracts and Applications
2011 - Sociedade Brasileira de Fruticultura | Revista Brasileira de Fruticultura
Produção Nacional
Revisado por pares
Francisco Assis da Silva Santos, Islândia Maria Carvalho de Sousa, Idê Gomes Dantas Gurgel, Adriana Falangola Benjamin Bezerra, Nélson Filice de Barros,
To examine the involvement of stakeholders in the implementation of a local policy of integrative practices.Qualitative study conducted in the city of Recife, Northeastern Brazil. Data was collected from local health board records between 2004 and 2009, interviews with managers and key informants and focus groups with providers and users. The analysis was performed using the condensation of meaning model. The results were grouped into four categories of stakeholders according to their influence ...
Tópico(s): Rural Development and Agriculture
2011 - UNIVERSIDADE DE SÃO PAULO | Revista de Saúde Pública
Peifen Zhu, Hongyang Zhu, Weiping Qin, Breno H. Dantas, Wei Sun, Chee-Keong Tan, Nelson Tansu,
In this work, the amorphous Eu3+-doped TiO2 spheres were synthesized by low cost mixed-solvent method, while the anatase and rutile spheres can be obtained by annealing the as-synthesized amorphous TiO2 spheres at elevated temperatures. The optical properties of Eu3+-doped TiO2 spheres were also investigated, and strong red emission (centered at 610 nm) with narrow line-width of 30 nm was observed under 465 nm or 394 nm excitations for the Eu3+-doped anatase TiO2 spheres. Our findings indicate the ...
Tópico(s): Quantum Dots Synthesis And Properties
2016 - American Institute of Physics | Journal of Applied Physics
Produção Nacional
Rúiter Silva Ferreira, Carlos Arturo Levi D’Ancona, V.P. Dantas-Filho, Nelson Rodrígues Netto, Ricardo Miyaoka,
Evaluar los efectos de la rizotomía sacral percutánea por radiofrecuencia en pacientes con lesión de la médula espinal sobre parámetros urodinámicos (capacidad cistométrica máxima [CCM] y presión del detrusor a capacidad cistométrica máxima [PdetCCM]). En este estudio prospectivo se evaluó a 8 pacientes con LME (4 hombres y 4 mujeres) con una media de edad de 31,3 años (de 22 a 41). El intervalo medio entre la lesión de la médula espinal y la rizotomía fue de 53,5 meses (entre 20 y 96). A todos los pacientes ...
Tópico(s): Pelvic floor disorders treatments
2011 - Elsevier BV | Actas Urológicas Españolas
Produção Nacional
Revisado por pares
José Mário Araújo, Jason Bettega, Nelson J. B. Dantas, Carlos E.T. Dórea, Dario Richiedei, Iacopo Tamellin,
This paper proposes a method for active vibration control to a two-link flexible robot arm in the presence of time delay, by means of robust pole placement. The issue is of practical and theoretical interest as time delay in vibration control can cause instability if not properly taken into account in the controller design. The controller design is performed through the receptance method to exactly assign a pair of pole and to achieve a given stability margin for ensuring robustness to uncertainty. ...
Tópico(s): Iterative Learning Control Systems
2021 - Multidisciplinary Digital Publishing Institute | Applied Sciences
Produção Nacional
Revisado por pares
Nelson J. B. Dantas, Carlos E.T. Dórea, José Mário Araújo,
In this note, a novel approach to design rank-one – single input – feedback controllers for second-order systems with time delay is presented. The versatile, well-known receptance modeling is combined with classical frequency response methods of control design, and the feedback gains are computed in order to achieve a given stability margin based on sensitivity specifications. The systems under study are assumed to be stable in open-loop. A heuristic optimization technique, namely, genetic algorithm ...
Tópico(s): Numerical methods for differential equations
2019 - Elsevier BV | Mechanical Systems and Signal Processing
Produção Nacional
Revisado por pares
Nelson Spector, Mario Alberto Dantas L. da Costa, Wolmar Pulcheri, Ricardo C. Salgado, Márcio Nucci, Carlos Augusto Ferreira de Andrade, José Carlos de Morais, Onofre de Castro, Andrea F. Scaletsky, Eloá Pereira Brabo, Elisabeth Jorge, Sergio E. Allan, Halley Pacheco de Oliveira,
Over the last 15 years, a number of combination chemotherapy regimens have been reported to induce more than 80% complete remissions (CR) in patients with advanced Hodgkin disease (HD). Almost all such studies have been conducted in large institutions from North America and Europe. It remains to be proven, however, that those regimens are equally effective for the larger population of patients with HD who live in very different social conditions in third-world countries.Fifty-nine patients with advanced- ...
Tópico(s): Viral-associated cancers and disorders
1993 - Wiley | Cancer
Produção Nacional
Revisado por pares
Nelson J. B. Dantas, Carlos E.T. Dórea, José Mário Araújo,
Tópico(s): Structural Health Monitoring Techniques
2021 - Springer Science+Business Media | Meccanica
Produção Nacional
Revisado por pares
Carla C. A. Leal, Otidene Rossiter Sá da Rocha, Marta Maria Menezes Bezerra Duarte, Renato F. Dantas, Maurício da Motta, Nelson Medeiros de Lima Filho, Valdinete L. da Silva,
The textile industry is economically important for the development of Brazil. However, the generated effluents from this activity present a complex molecular structure that gives a recalcitrant characteristic in its residuary waters. Due to this reality, it is necessary to develop viable technologies that remove those compounds, which are mostly dyes. In this study, the green coconut mesocarp was used to remove Remazol Black B dye of an aqueous solution using the adsorption technique. To perform ...
Tópico(s): Dye analysis and toxicity
2010 - Association of Chemists of the Chemical Institute of Sarria | Afinidad
Produção Nacional
Revisado por pares
Henrique Dantas de Menezes, Gabriela Braga Rodrigues, Simone de Pádua Teixeira, Nelson Sidnei Massola Júnior, Luciano Bachmann, Mark Wainwright, Gilberto Úbida Leite Braga,
The increasing tolerance to currently used fungicides in both clinical and agricultural areas is of great concern. The nonconventional light-based approach of antimicrobial photodynamic treatment (APDT) is a promising alternative to conventional fungicides. We evaluated the effects of APDT with four phenothiazinium derivatives (methylene blue [MB], new methylene blue N [NMBN], toluidine blue O [TBO], and the novel pentacyclic phenothiazinium photosensitizer [PS] S137) on conidia of three fungal species ( ...
Tópico(s): Ocular Infections and Treatments
2013 - American Society for Microbiology | Applied and Environmental Microbiology
Produção Nacional
Revisado por pares
Donato Alexandre Gomes Aranda, Jussara de Araújo Gonçalves, José Sotolongo Peres, André Luís Dantas Ramos, Carlos Augusto Ribeiro de Melo, O. A. C. Antunes, Nelson C. Furtado, Carlton A. Taft,
Abstract We have evaluated the influence of alcohol/fatty acid molar ratio (methanol or ethanol), water and catalyst concentrations and temperature by the esterification of palm fatty acids by heterogeneous acid catalysts (varying types, forms, and particle size). Polynaphtalene sulfonic acid (PSA) and niobium oxide (Nb 2 O 5 ) presented better performance than zeolite catalysts. Reaction with methanol presented higher conversion than with ethanol. The experimental design showed that the most relevant ...
Tópico(s): Thermal and Kinetic Analysis
2009 - Wiley | Journal of Physical Organic Chemistry
Produção Nacional
Revisado por pares
Maria F. D. Amorim, Margareth de Fátima Formiga Melo Diniz, Maria Salete Trigueiro de Araújo, João Carlos Lima Rodrigues Pita, Jadson Gomes Dantas, Josué A. Ramalho, Aline Lira Xavier, Thayse V. Palomaro, Nelson L. B. Júnior,
Kava is an anxiolytic herbal medicine used in the treatment of sleep and anxiety disorders. Some cases of kava-induced hepatotoxicity have been reported in the literature leading to its banishment in most countries worldwide. Clinically, the spectrum ranged from transient elevations of liver enzyme levels to fulminant liver failure and death. Liver transplantation was performed in a few cases. This paper provides a review of the currently available literature on kava-related toxic hepatitis which ...
Tópico(s): Complementary and Alternative Medicine Studies
2007 - Springer Science+Business Media | Revista Brasileira de Farmacognosia
Produção Nacional
Revisado por pares
Renata Diniz, M. S. S. Dantas, Nelson G. Fernandes, Maria Terezinha C. Sansiviero,
Cobalt and zinc salts of 1,2,4,5-benzenetetracarboxylic acid (pyromellitic acid), [C(6)H(2)(COO)(4)H(4)], have been synthesized and investigate by polarized Raman spectroscopy. These compounds present short intramolecular hydrogen bonds (SHB) between adjacent carboxyl groups. Raman spectra indicate the presence of this interaction in both salts. Three specific vibrational of SHB modes have been investigated: O-H-O symmetric [nu(sym)(OHO)] and asymmetric [nu(asym)(OHO)] stretching modes and O-H stretching ...
Tópico(s): Nonlinear Optical Materials Research
2006 - Elsevier BV | Spectrochimica Acta Part A Molecular and Biomolecular Spectroscopy
Carina Dantas, Ana Jegundo, João Quintas, Ana Isabel Martins, Alexandra Queirós, Nelson Pacheco Rocha,
Background: The Usefulness, Satisfaction and Ease of use (USE) is a 30-item questionnaire developed to assess self-perceived usability. Objective: The study reported in this paper supports the translation, cultural adaptation and validation of the European Portuguese version of the USE. Methods: The study was divided into two phases, the questionnaire translation and adaptation, and the assessment of its validity and reliability. Results: The questionnaire translation resulted in a European Portuguese ...
Tópico(s): Technology Adoption and User Behaviour
2017 - Springer Nature | Advances in intelligent systems and computing
Produção Nacional
Revisado por pares
M. B. Dantas, Anderson R. Albuquerque, Allan Kardec Barros, Manoel Gabriel Rodrigues Filho, Nelson Roberto Antoniosi Filho, F. S. M. Sinfrônio, Raul Rosenhaim, L. E. B. Soledade, I. M. G. Santos, A. G. Souza,
The main factors responsible for the oxidative processes of biodiesel are oxygen, metal traces, high temperature and the amount of unsaturated fatty acids. The biodiesel quality is harmed by the oxidation products, which are corrosive to engine chambers and may lead to clogging of the injection pumps and filters, besides increasing the biodiesel viscosity. Thus, this work aimed at investigating the oxidative stability of corn biodiesel, obtained by base-catalyzed transesterification reaction, using ...
Tópico(s): Thermal and Kinetic Analysis
2010 - Elsevier BV | Fuel
Produção Nacional
Revisado por pares
Andréa Soares, Irène Biasoli, Adriana Scheliga, Ronir Raggio Luiz, Mario Alberto Dantas L. da Costa, Marcelo Gerardin Poirot Land, Sérgio Romano, José Carlos Morais, Nelson Spector,
Socioeconomic status (SES) is a determinant of outcome in various types of cancer. The aim of this study is to analyze the impact of the SES in Hodgkin's lymphoma (HL). From 2001 to 2005, 194 consecutive patients were prospectively followed in 5 institutions. Patients answered a questionnaire with a set of items used to determine the SES, and were then divided in 2 groups according to their SES score. There were 151 patients (78%) with a higher SES and 43 patients (22%) with a lower SES. The complete ...
Tópico(s): Multiple and Secondary Primary Cancers
2006 - Wiley | International Journal of Cancer
Produção Nacional
Acacio Figueiredo Figueiredo Neto, Bárbara França Dantas, José Castro Silva, Nélson Cárdenas Olivier, Maraisa Ferreira Silva,
Diante das necessidades de conhecimento prévio da perda de carga a ser vencida pelo conjunto motor-ventilador, em sistemas de aeração e secagem, decorrente da resistência apresentada pela massa porosa ao fluxo de ar, com este trabalho pretendeu-se estudar a resistência com diferentes percentuais de impurezas ao fluxo de ar, utilizando-se o produto com teor de umidade de 8%b.u. Para realização do experimento, utilizou-se um equipamento devidamente projetado. Foram medidas as perdas de carga na coluna ...
Tópico(s): Peanut Plant Research Studies
2012 - | Nucleus
Produção Nacional
Revisado por pares
Acacio Figueiredo Figueiredo Neto, Bárbara França Dantas, José Castro Silva, Nélson Cárdenas Olivier, Maraisa Ferreira Silva,
Diante das necessidades de conhecimento previo da perda de carga a ser vencida pelo conjunto motor-ventilador, em sistemas de aeracao e secagem, decorrente da resistencia apresentada pela massa porosa ao fluxo de ar, com este trabalho pretendeu-se estudar a resistencia com diferentes percentuais de impurezas ao fluxo de ar, utilizando-se o produto com teor de umidade de 8%b.u. Para realizacao do experimento, utilizou-se um equipamento devidamente projetado. Foram medidas as perdas de carga na coluna ...
Tópico(s): Peanut Plant Research Studies
2012 - Taylor & Francis | Nucleus
Produção Nacional
Revisado por pares
Marcos Dantas dos Santos, Newton Kiyoshi Fukumasu, André Paulo Tschiptschin, Nelson Batista de Lima, Carlos A. Figueroa, Jennifer Stefani Weber, Roberto Martins de Souza, Izabel Fernanda Machado,
Reduced hardness and wear resistance may limit SAE C17200 copper‐beryllium alloy use in manufacturing applications, such as plunger tips of die casting machines and as cores and inserts for steel dies in injection molding processes. In order to improve the surface properties of Cu—Be alloys, amorphous carbon (a-C) films have been selected since these coatings may show high hardness, low wear rate and low coefficient of friction. However, the adhesion of carbonaceous films on Cu—Be alloys remains ...
Tópico(s): Advanced materials and composites
2022 - Elsevier BV | Surface and Coatings Technology
Produção Nacional
Revisado por pares
Henrique Dantas de Menezes, Ana C. Pereira, Guilherme Thomaz Pereira Brancini, Helton Carlos de Leão, Nelson Sidnei Massola Júnior, Luciano Bachmann, Mark Wainwright, Jairo Kenupp Bastos, Gilberto Úbida Leite Braga,
Tópico(s): Photodynamic Therapy Research Studies
2014 - Elsevier BV | Journal of Photochemistry and Photobiology B Biology
Produção Nacional
Rafael P. Salomão, Ima Célia Guimarães Vieira, Chieno Suemitsu, Nélson de Araújo Rosa, Samuel Almeida, Dário Dantas do Amaral, Moirah Paula Machado de Menezes,
No intuito de se caracterizar a flora da região de Belo Monte ou Volta Grande do Xingu, efetuou-se uma análise da florística, fitossociologia, estrutura e etnobotânica nas fitofisionomias florestais na área de estudo que inclui os territórios de Altamira, Anapu, Senador José Porfírio e Vitória do Xingu, nas mesorregiões do baixo e médio Xingu, no estado do Pará. Nas quatro fitofisionomias florestais majoritárias (floresta ombrófila densa, floresta ombrófila aluvial, floresta ombrófila aberta com ...
Tópico(s): African Botany and Ecology Studies
2007 - | Boletim do Museu Paraense Emílio Goeldi - Ciências Naturais