
Fernanda Cristina P. Rocha e Silva, Nathália Maria Padilha da Rocha e Silva, Ivison Amaro da Silva, Pedro Pinto Ferreira Brasileiro, Juliana M. Luna, Raquel D. Rufino, Valdemir Alexandre dos Santos, Leonie Asfora Sarubbo,
The increasingly automated industrial processes are responsible for a large part of the generation of oily effluents, which present great difficulty of treatment due to the complexity of removal of fine particles of oil. The application of biosurfactants and the dimensionless number of Damköhler (Da) in a prototype of dissolved air flotation (DAF) allowed predictions of efficiency of oil removal in oily waters. Two different biosurfactants were used in order to confirm a first-order kinetic law for ...
Tópico(s): Minerals Flotation and Separation Techniques
2018 - Elsevier BV | Journal of Water Process Engineering

Bruno Freitas, Juliana G. M. Brito, Pedro Pinto Ferreira Brasileiro, Raquel D. Rufino, Juliana M. Luna, Valdemir Alexandre dos Santos, Leonie Asfora Sarubbo,
Oil spills in oceans cause irreparable damage to marine life and harm the coastal populations of affected areas. It is therefore fundamental to develop treatment strategies for such spills. Currently, chemical dispersants have been used during oil spills, although these agents have been increasingly restricted due to their toxic potential. Thus, the aim of the present study was to formulate a biodegradable commercial biosurfactant for application as a dispersant. Biosurfactants are scientifically ...
Tópico(s): Toxic Organic Pollutants Impact
2016 - Frontiers Media | Frontiers in Microbiology

Valdemir Queiroz de Oliveira, Otávio Augusto Lacerda Ferreira Pimentel, Caio Rubens do Rêgo Oliveira, Elizabeth Pereira dos Santos, Alitiene Moura Lemos Pereira, Alfredo Olivera Gálvez, Luís Otávio Brito,
Ions are important for shrimp metabolic processes and can affect their growth. However, little is known about the need to supplement the major ions to maintain an adequate Ca:Mg:K ratio for shrimp as well as how often these ratios should be adjusted during a culture cycle using low-salinity water so that shrimp growth is not affected. The aim of this study was to evaluate the effect of ionic adjustment frequencies in low-salinity water in a synbiotic nursery system and verify its effects on Litopenaeus ...
Tópico(s): Aquaculture disease management and microbiota
2022 - Elsevier BV | Aquaculture

Caio Rubens do Rêgo Oliveira, Valdemir Queiroz de Oliveira, Otávio Augusto Lacerda Ferreira Pimentel, Elizabeth Pereira dos Santos, Paulo Roberto Campagnoli de Oliveira Filho, Alfredo Olivera Gálvez, Luís Otávio Brito,
Tópico(s): Aquatic life and conservation
2022 - Springer Science+Business Media | Aquaculture International

Lyvia Neves Rebello Alves, Débora Dummer Meira, Luiza Poppe Merigueti, Matheus Correia Casotti, Diego do Prado Ventorim, Jucimara Ferreira Figueiredo Almeida, Valdemir Pereira de Sousa, Marllon Cindra Sant’Ana, Rahna Gonçalves Coutinho da Cruz, Luana Santos Louro, Gabriel Mendonça Santana, Thomas Erik Santos Louro, Rhana Evangelista Salazar, Danielle Ribeiro Campos da Silva, Aléxia Stefani Siqueira Zetum, Raquel Silva dos Reis Trabach, Flávia Imbroisi Valle Errera, Flavia Paula, Eldamária de Vargas Wolfgramm dos Santos, Elizeu Fagundes de Carvalho, Iúri Drumond Louro,
Breast cancer is the second most frequent cancer in the world. It is a heterogeneous disease and the leading cause of cancer mortality in women. Advances in molecular technologies allowed for the identification of new and more specifics biomarkers for breast cancer diagnosis, prognosis, and risk prediction, enabling personalized treatments, improving therapy, and preventing overtreatment, undertreatment, and incorrect treatment. Several breast cancer biomarkers have been identified and, along with ...
Tópico(s): Breast Cancer Treatment Studies
2023 - Multidisciplinary Digital Publishing Institute | Genes

Paulo Eduardo Guedes Carvalho, Valdemir Muzulon dos Santos, Hassan Isber, Flávio Augusto Cotrim-Ferreira,
INTRODUCTION: LED light-curing devices seek to provide a cold light activator which allows protocols of material polymerization with shorter duration. OBJECTIVE: The present study aimed to evaluate the shear bond strength of bracket bonding using three types of light-curing devices: One with halogen light (Optilight Plus - Gnatus) and two with LEDs (Optilight CL - Gnatus and Elipar Freelight - 3M/ESPE). RESULTS: Comparing the results by analysis of variance, the Gnatus LED device showed an inferior statistical ...
Tópico(s): Additive Manufacturing and 3D Printing Technologies
2013 - Dental Press Editora | Dental Press Journal of Orthodontics

Elias J. Silva, Ivison A. Silva, Pedro Pinto Ferreira Brasileiro, Priscilla F. Correa, Darne Germano de Almeida, Raquel D. Rufino, Juliana M. Luna, Valdemir Alexandre dos Santos, Leonie Asfora Sarubbo,
Tópico(s): Environmental Chemistry and Analysis
2019 - Springer Science+Business Media | Biodegradation

Pedro Pinto Ferreira Brasileiro, Rita de Cássia F. Soares da Silva, Valdemir Alexandre dos Santos, Leonie Asfora Sarubbo, Mohand Benachour,
Microbubble flotation is a process for the treatment of oily water that requires attention to the variables of the oil removal process. In the present study, experimental designs were applied to a microbubble generation and measuring unit. The factors selected for optimization of the microbuble production were water flow rate, airflow rate, pH, and surfactant concentration. The response variables were dynamic Sauter diameter (DSD), static Sauter diameter (SSD), and microbubble haze height (MHH). Factor ...
Tópico(s): Electrohydrodynamics and Fluid Dynamics
2021 - Elsevier BV | Process Safety and Environmental Protection

Sylvana Melo dos Santos, Anderson Luiz Ribeiro de Paiva, Valdemir Ferreira da Silva,
A região semiárida de Pernambuco tem baixa intensidade pluviométrica e elevada evapotranspiração. Barragens subterrâneas possibilitam as práticas de agricultura familiar irrigada e criação de animais com finalidade de subsistência e comercial. Esta água, após constantes períodos de estiagem, pode apresentar elevada concentração de sais, reduzindo a produtividade das culturas, além de salinizar e sodificar o solo tornando-se imprópria para irrigação ou consumo animal. Nesse trabalho avaliou-se as ...
Tópico(s): Environmental and biological studies
2016 - | Revista Brasileira de Agricultura Irrigada

Ana Carla da Silva Santos, Itamar Ferreira da Silva, José Romualdo de Sousa Lima, Alberício Pereira de Andrade, Valdemir Ribeiro Cavalcante,
Com o objetivo de avaliar a eficiência de duas leguminosas e duas gramíneas na melhoria das características químicas do solo (carbono orgânico, CTC efetiva e potencial e teores de P, K, Na, Ca, Mg, H + Al e pH do solo), considerando a profundidade e a posição de coleta das amostras, foi realizado experimento com arranjo fatorial em parcelas subdivididas, utilizadas anteriormente para estudos de perdas de solos por erosão, em um Nitossolo Vermelho eutrófico textura argilosa, localizado no município ...
Tópico(s): Growth and nutrition in plants
2001 - Sociedade Brasileira de Ciência do Solo | Revista Brasileira de Ciência do Solo
Darne Germano de Almeida, Juliana M. Luna, Ivison A. Silva, Elias Silva, Valdemir Alexandre dos Santos, Pedro Pinto Ferreira Brasileiro, Leonie Asfora Sarubbo,
A common practice adopted by several Brazilian companies is to collect residual frying oil and to use it for detergent or soap production. This practice, however, is challenging for the industry, since the use of waste oil generates a heterogenous effluent with high turbidity and containing numerous suspended particles. In this context, the flotation process has proven to be quite efficient for the treatment of this type of effluent, with the capability of removing a larger amount of oil in comparison ...
Tópico(s): Minerals Flotation and Separation Techniques
2019 - AIDIC-Italian Association of Chemical Engineering | Chemical engineering transactions

Valdemir Garcia Ferreira, Rafael Alves Bonfim de Queiroz, Miguel Antonio Caro Candezano, Giseli Aparecida Braz de Lima, Laís Corrêa, Cassio M. Oishi, Fernando Luiz Pio dos Santos,
This paper reports experiments on the use of a recently introduced advection bounded upwinding scheme, namely TOPUS (Computers & Fluids 57 (2012) 208-224), for flows of practical interest. The numerical results are compared against analytical, numerical and experimental data and show good agreement with them. It is concluded that the TOPUS scheme is a competent, powerful and generic scheme for complex flow phenomena. Mathematical subject classification: Primary: 06B10; Secondary: 06D05.
Tópico(s): Fluid Dynamics and Turbulent Flows
2012 - Springer Science+Business Media | Computational and Applied Mathematics

Otávio Augusto Lacerda Ferreira Pimentel, Valdemir Queiroz de Oliveira, Caio Rubens do Rêgo Oliveira, Elizabeth Pereira dos Santos, William Severi, Jesus Malpartida Pasco, Maurício Gustavo Coelho Emerenciano, Alfredo Olivera Gálvez, Luís Otávio Brito,
Tópico(s): Aquaculture disease management and microbiota
2023 - Springer Science+Business Media | Aquaculture International

Leonardo Bandeira dos Santos, Rita de Cássia F. Soares da Silva, Pedro Pinto Ferreira Brasileiro, Rodrigo Dias Baldo, Leonie Asfora Sarubbo, Valdemir Alexandre dos Santos,
The increase in water-oil separation efficiency as a function of biosurfactant in a novel process of a continuous induced pre-saturation tower (IPST) with stages was described. The pre-saturation of the effluent in a new IPST prior to its entrance in each stage enabled enhancing the effect of the biosurfactant on the flocculation of oil droplets due to the close contact with the air during the formation of microbubbles inside a centrifuge pump. This change of a conventional dissolved-air flotation ...
Tópico(s): Electrohydrodynamics and Fluid Dynamics
2021 - Elsevier BV | Biotechnology Reports
I. Silva, Ana Helena Mendonça Resende, NIKOLLE BARBOSA DA SILVA, Pedro Pinto Ferreira Brasileiro, J. Pedrosa Didier, Juliana M. Luna, Raquel D. Rufino, Valdemir Alexandre dos Santos, Leonie Asfora Sarubbo,
Oil spills, whether in an aquatic or terrestrial environment, cause the imbalance of ecosystems. It is essential to develop actions and strategies for the remediation of such accidents. Currently, chemical surfactants have been used in oil spills, although the use of these agents is increasingly restricted because of their toxic potential. One solution for the remediation of soils contaminated by oils is the use of biosurfactants, which are biodegradable and nontoxic. In this sense, the biosurfactants ...
Tópico(s): Environmental Chemistry and Analysis
2018 - AIDIC-Italian Association of Chemical Engineering | Chemical engineering transactions

Pedro Pinto Ferreira Brasileiro, Leonardo Bandeira dos Santos, Marcos José Chaprão, Darne Germano de Almeida, Rita de Cássia F. Soares da Silva, Bruno Augusto Cabral Roque, Valdemir Alexandre dos Santos, Leonie Asfora Sarubbo, Mohand Benachour,
Flotation with microbubbles is one of the most viable methods for separating oil from water. Microbubbles are formed by the injection of a small air flow through a pressurized liquid flow. In the present study, a microbubble generation and measurement unit (MBGMU) was constructed to measure mean microbubble size through the liquid flow and airflow of the system. The liquid flow rate was measured by a Hall effect-type sensor, whereas it was necessary to construct a sensor for bubbles immersed in glycerin ...
Tópico(s): Electrical and Bioimpedance Tomography
2019 - Elsevier BV | Process Safety and Environmental Protection

Otávio Augusto Lacerda Ferreira Pimentel, Luke A. Roy, Elizabeth Pereira dos Santos, Valdemir Queiroz de Oliveira, Luís Otávio Brito,
... very little attention by researchers. Otávio Augusto Lacerda Ferreira Pimentel: Conceptualization; investigation; visualization; writing – original draft. Luke Aaron Roy: Investigation; visualization; writing – review and editing. Elizabeth Pereira dos Santos: Investigation; visualization; writing – review and editing. Valdemir Queiroz de Oliveira: Investigation; visualization; writing – review and ...
Tópico(s): Aquatic life and conservation
2022 - Wiley | Reviews in Aquaculture
Maria do Carmo Ferreira dos Santos Silva, Valdemir da Silva, Kleber Luís Alves Guedes, Andreza Cristiane Silva de Lima, Elyrouse Cavalcante de Oliveira Bellini,
Tópico(s): Business and Management Studies
2025 - CENTRO UNIVERSITÁRIO CHRISTUS | Revista Gestão em Análise
Bruno Augusto Cabral Roque, Matheus Henrique Castanha Cavalcanti, Pedro Pinto Ferreira Brasileiro, Paulo Henrique Ramalho Pereira Gama, Valdemir Alexandre dos Santos, Attílio Converti, Mohand Benachour, Leonie Asfora Sarubbo,
Tópico(s): Global Energy and Sustainability Research
2025 - Elsevier BV | Gondwana Research

Otávio Augusto Lacerda Ferreira Pimentel, Valdemir Queiroz de Oliveira, Rildo José Vasconcelos de Andrade, Carlos Yure B. Oliveira, Elizabeth Pereira dos Santos, Alitiene Moura Lemos Pereira, Luís Otávio Brito, Alfredo Olivera Gálvez,
The aim of this study was to evaluate plankton communities in Penaeus vannamei nurseries under different frequencies of adjustment on Ca:Mg:K ratio in low salinity water and with synbiotic system. A nursery culture was carried out for 40 days, using 2000 shrimp m⁻³. Following treatments were established: 1IA (Ca:Mg:K ratio adjustment to 1:3:1 on day 1); 2IA (Ca:Mg:K ratio adjustment to 1:3:1 on day 1 and day 20); 3IA (Ca:Mg:K ratio adjustment to 1:3:1 on day 1, day 10, and day 20); SW (seawater - salinity ...
Tópico(s): Innovations in Aquaponics and Hydroponics Systems
2023 - Elsevier BV | Aquaculture and Fisheries
Daniel de Morais Sobral, Dayana Montero Rodríguez, Ákylla Fernanda Souza Silva, Adriana Ferreira de Souza, Valdemir Alexandre dos Santos, Galba Maria de Campos‐Takaki,
Nowadays, water pollution caused by dye contaminants has become a severe global issue and aroused tremendous attention, since it is estimated that more than 100 thousand types of commercial organic dyes have been produced. Meanwhile, huge amounts of dyes have been discharged into natural environment during the production process, which causes serious environmental problems. Hence, it is quite urgent to remove the dyestuffs from water, and several methods have been devoted to resolving this issue, ...
Tópico(s): Enzyme-mediated dye degradation
2022 - Brazilian Journal of Development | Brazilian Journal of Development

Leonie Asfora Sarubbo, Alexandre Augusto P. Selva Filho, Lais Alexandre do Nascimento, Raquel D. Rufino, Juliana M. Luna, Pedro Pinto Ferreira Brasileiro, Rita de Cássia F. Soares da Silva, Mohand Benachour, Valdemir Alexandre dos Santos,
In this study, we developed a hybrid system for the treatment of oily water composed of two pilot-scale prototypes combining physicochemical and biological separation methods.Oily water flowed through a dissolved air flotation (DAF) prototype in the first step.At the exit of this prototype, part of the water was saturated with atmospheric air and sent back into the DAF chamber with the aid of a centrifuge pump and the injection of microbubbles.The other part of the treated water fed a constructed ...
Tópico(s): Aquatic Ecosystems and Phytoplankton Dynamics
2021 - Polytechnic Institute of Iasi | Environmental Engineering and Management Journal
Maria Thayná Nascimento Ferreira, José Valdemir da Silva Dantas, Marli Nascimento dos Santos Andreza, Thainá Gonçalves Henrique, Victória Hellen Nicácio Dias Tavares, Willma José de Santana,
O desenvolvimento sustentável, é o desenvolvimento que satisfaz as necessidades do presente sem comprometer a capacidade das gerações futuras de satisfazerem as suas próprias necessidades. Esse conceito surgiu na comissão mundial sobre meio ambiente e desenvolvimento da ONU, em 1983, o desenvolvimento sustentável, visa o crescimento econômico, sem esgotar os recursos para o futuro. Esse estudo tem como objetivo descrever a importância do desenvolvimento sustentável para a sociedade e enfatizar como ...
Tópico(s): Environmental Sustainability and Education
2024 - Brazilian Journal of Development | Brazilian Journal of Development

Weverton Alves dos Santos, Rodrigo de Alencar Ferreira de Araújo, Valdemir da Silva, Anderson de Barros Dantas, Andreza Cristiane Silva de Lima,
O objetivo deste estudo é identificar o grau de satisfação dos alunos de graduação do curso de Ciências Contábeis das Instituições de Ensino Superior Públicas de Alagoas, a partir das variáveis de percepção propostas por Paswan e Young (2002), modelo intitulado por Student Instructional Rating System. A pesquisa é descritiva quanto aos objetivos, quantitativa com relação à abordagem e tem seu procedimento realizado por intermédio de levantamento de dados, com amostra de 169 estudantes de Ciências ...
Tópico(s): Education and Public Policy
2024 - UNIVERSIDADE DO EXTREMO SUL CATARINENSE | Criar Educação

Thainá Gonçalves Henrique, Victória Hellen Nicácio Dias Tavares, Cícera Lais Ferreira Diniz, Marli Nascimento dos Santos Andreza, Maria Thayná Nascimento Ferreira, José Valdemir da Silva Dantas, Willma José de Santana,
A água ao longo da história humana, teve as suas necessidades de uso alteradas, a tecnologia possibilitou a criação de padrões de qualidade mais exigentes e determinou os volumes necessários para as diversas atividades. O objetivo deste estudo é demonstrar a importância das análises de Água para a saúde e bem estar da população, verificando os procedimentos para realização das análises, bem como dados que comprovem a qualidade e segurança de águas destinadas ao abastecimento. Trata-se de uma revisão ...
Tópico(s): Water Quality Monitoring Technologies
2024 - Brazilian Journal of Development | Brazilian Journal of Development
Aldemar Antônio Pedrosa Campello Filho, Pedro Pinto Ferreira Brasileiro, Marcos José Chaprão, Valdemir Alexandre dos Santos, Rita de Cássia F. Soares da Silva, Vitor Luiz de Paula Silva Santos, Leonie Asfora Sarubbo,
Dissolved air flotation technology is the most efficient and economical solution for the treatment of industrial effluents, using biosurfactants to replace chemical surfactants, due to the tensoactive properties, greater stability and biodegradability. The present work aims to present an efficient solution through the new DAF technology, configured in the Induced Saturation Tower (IST) in stages, in bench scale. To increase the efficiency of the process, an anionic polymer as flocculating and a microbial ...
Tópico(s): Microbial bioremediation and biosurfactants
2019 - AIDIC-Italian Association of Chemical Engineering | Chemical engineering transactions
Talita dos Santos Ferreira, Eliane Perlatto Moura, Sandy Hosken, Valdemir Fonseca da Silva, José Maria Peixoto,
Tópico(s): Ethics in medical practice
2025 - Revista Eletronica Acervo Saude | Revista Eletrônica Acervo Saúde

Eliezio Nascimento Barboza, Valdemir Fonseca da Silva, Agílio Tomaz Marques, Suzana Araújo dos Santos, Matheus Matos Ferreira Silva, Adryele Gomes Maia, Francisco Igor Dalles da Mata Vieira,
O processo de impermeabilização nas cidades tem causado elevado escoamento superficial e, consequentemente, causando cheias pela inexistência e/ou precariedade dos sistemas de drenagem. Sendo assim, esta pesquisa objetiva realizar um estudo acerca do escoamento superficial em uma microbacia urbana no município de Barro. Para a delimitação da bacia utilizou-se de um MDE proveniente da imagem SRTM, obtida pelo projeto TOPODATA. Para a delimitação da bacia, elaboração dos mapas de curvas de nível, ...
Tópico(s): Geography and Environmental Studies
2022 - Grupo de Pesquisa Metodologias em Ensino e Aprendizagem em Ciências | Research Society and Development
Agna Soares da Silva Menezes, J Santos, Valdemir Fonseca da Silva, Patrícia Ferreira Costa, Gláucia Cavalcante Oliveira, Mariane Mendes Gomes, Érika Fernanda Sales Martuscelli, Paulo Henrique da Cruz Ferreira, Murilo Soares Costa, Tatiana Almeida de Magalhães,
As neoplasias podem ser definidas como proliferações celulares anormais, pois há descontrole da produção dessas células, submetendo o organismo a efeitos agressivos causado por elas. Os pacientes com tumores cerebrais sofrem alterações neuropsiquiátricas e físicas devido a efeitos colaterais severos tanto da doença, quanto do tratamento, sendo em alguns casos alterações irreversíveis. Qualidade de vida é a percepção que o indivíduo tem sobre sua posição na vida, que engloba todos os conceitos, tudo ...
Tópico(s): Health, Nursing, Elderly Care
2024 - Servicios Academicos Intercontinentales | Contribuciones a las Ciencias Sociales

Eliezio Nascimento Barboza, Valdemir Fonseca da Silva, Agílio Tomaz Marques, Hiran Mendes Castro Filho, Suzana Araújo dos Santos, Matheus Matos Ferreira Silva, Adryele Gomes Maia, Francisco Igor Dalles da Mata Vieira,
O crescimento urbano das cidades brasileiras ocorreu de forma desordenada, sem planejamento ambiental e urbano, ocasionando diversos problemas para a população. Diversas cidades foram inicialmente ocupadas próximas aos rios e não levavam em consideração a dinâmica natural dos mesmos, ocorrendo desastrosas as enchentes e inundações pelos índices pluviométricos que proporcionam um aumento no volume dos corpos hídricos. No município do Crato não foi diferente, em que, atualmente, as áreas de escoamento ...
Tópico(s): Environmental and biological studies
2022 - Grupo de Pesquisa Metodologias em Ensino e Aprendizagem em Ciências | Research Society and Development