bluuebunny/crossref_metadata_2025 huggingface dataset:
Representações sociais sobre cuidar e tratar: o olhar de pacientes e profissionais
Authors: Borges Moema da Silva , Queiroz Lilian Silva , Silva Hellén Cristina Pereira da
Published: January 2012

A pesquisa teve por objetivo conhecer o núcleo central das representações sociais de pacientes e enfermeiras(os) acerca do significado de cuidar e tratar. Consiste em um estudo de natureza qualitativa, baseado na fundamentação teórico-metodológica da abordagem estrutural das representações sociais. Participaram do estudo 90 sujeitos. Aplicou-se um questionário utilizando-se a técnica de livre associação. Os dados foram analisados com o auxílio do software Evoc. Os resultados revelam que as representações sociais de pacientes e profissionais acerca dos conceitos de cuidar expressam uma relação ética, sensível, solidária, afetiva e compromissada com a vida humana amorosa. Entretanto, as representações sobre o tratar apontam para diferentes significados e distintas expectativas. Conclui-se que a discrepância entre essas representações é bastante preocupante e merece atenção especial da categoria. Tal discrepância denuncia que o serviço oferecido pelos profissionais não satisfaz à demanda e ao desejo dos pacientes.
Escala diagramática para avaliação da severidade da mancha branca em milho
Authors: Sachs Paula Jimena Diniz , Neves Carmen Silvia Vieira Janeiro , Canteri Marcelo Giovanetti , Sachs Luís Guilherme
Published: January 2012

Escalas diagramáticas são importantes ferramentas para padronizar as estimativas da severidade de doenças em plantas. O objetivo deste trabalho foi desenvolver e validar uma escala diagramática para avaliação da severidade da mancha branca ou mancha de Phaeosphaeria em folhas de milho. A escala proposta ilustra os níveis de 1; 3; 6; 13; 25; 43; 63 e 79 % de severidade no terço médio de imagens de folhas de milho. A validação da escala foi realizada com o auxílio de dez avaliadores (cinco sem experiência e cinco com experiência), os quais estimaram a severidade da doença em 50 folhas de milho com sintomas da mancha branca, com e sem a utilização da escala. Análises de regressão foram utilizadas para avaliar a precisão e acurácia. A avaliação da acurácia indicou que sem o uso da escala sete avaliadores apresentaram desvios sistemáticos nas estimativas, enquanto que com o uso da escala foram apenas dois avaliadores. A precisão representada pelo coeficiente de determinação (r² ) das regressões, variou de 0,86 a 0,95 para os avaliadores inexperientes sem escala e 0,91 a 0,98 com escala. Os avaliadores experientes apresentaram r² variando de 0,91 a 0,95 sem escala e 0,94 e 0,98 com escala. A escala diagramática proposta melhorou a precisão e a acurácia das estimativas, independente da experiência do avaliador.
Susceptibility of leguminous green manure species to Rhizoctonia solani and Sclerotium rolfsii
Authors: Paula Júnior Trazilbo José de , Teixeira Hudson , Vieira Rogério Faria , Lehner Miller da Silva , Lima Renan Cardoso de , Queiroz Telma Fallieri Nascimento
Published: January 2012

We studied the susceptibility of species used as green manure in common bean fields to root rot (Rhizoctonia solani) and southern blight (Sclerotium rolfsii). Seeds of Crotalaria breviflora, Canavalia ensiformis, Cajanus cajan, Dolichos lablab, Stizolobium cinereum, S. aterrimum, and the bean cvs. "Pérola", "Valente" and "Carnaval" were sown in soil infested by either R. solani AG-4 or S. rolfsii in greenhouse. The emergence of D. lablab seedlings in soil infested by R. solani dropped to 62%. C. breviflora, C. ensiformis and cv. "Valente" presented the lowest root rot severity. The pathogen S. rolfsii drastically reduced seedling emergence in all species; no C. cajan and S. cinereum seedling emerged. All plant species presented high southern blight severity. We conclude that leguminous crops are not suitable as green manure for areas of bean cultivation with high R. solani and S. rolfsii populations.
Transpiração e temperatura foliar da cana-de-açúcar sob diferentes valores de potencial matricial
Authors: Trentin Roberto , Zolnier Sérgio , Ribeiro Aristides , Steidle Neto Antonio J
Published: January 2012

O objetivo deste trabalho foi avaliar a variação diurna da transpiração e da temperatura foliar da cana-de-açúcar, cv. RB867515, sob diferentes potenciais matriciais de água no substrato de cultivo e as condições meteorológicas em ambiente protegido. O efeito do estresse hídrico na transpiração e temperatura foliar foi determinado a partir da suspensão da irrigação, quando foram realizadas três campanhas de medições, iniciadas aos 122; 150 e 185 dias após o plantio (DAP) até que o potencial matricial de água no substrato (Ψ) alcançasse -1.500 kPa, aproximadamente. Sob ausência de estresse hídrico (Ψ>-50 kPa), a transpiração das plantas atingiu o valor máximo entre 10 e 13 h, próximo de 60; 70 e 100 g planta-1 h-1 para 122; 150 e 185 DAP, respectivamente. Sob condições de estresse hídrico severo (Ψ<-1.100 kPa), houve redução na transpiração diária de aproximadamente 73%, comparativamente às medições realizadas sem estresse e sob condições meteorológicas similares. Em condições de ausência de estresse hídrico e de céu nublado, o valor médio da diferença entre a temperatura foliar e a temperatura do ar foi de -2,9 ºC. Em contraste, sob condições de estresse hídrico severo e valores elevados de radiação solar global, a temperatura foliar chegou a ser 6,6 ºC superior à temperatura do ar.
Transporte, patogenicidade e transmissibilidade de fungos associados às sementes de pinhão manso
Authors: Sá Danila Alves Corrêa de , Santos Gil Rodrigues dos , Furtado Gleiber Quintão , Erasmo Eduardo Andréa Lemus , Nascimento Ildon Rodrigues do
Published: January 2012

Objetivou-se determinar a taxa de transporte de população de fungos associados às sementes de pinhão manso, a patogenicidade desses microrganismos a plântulas e frutos e a transmissibilidade fruto-semente e semente-plântula. Avaliaram-se a taxa de transporte, por meio de blotter test, de sementes produzidas nos estados de Minas Gerais, São Paulo, Bahia e Tocantins. As sementes foram submetidas aos tratamentos: sem desinfestação com tegumento (SDCT), sem desinfestação sem tegumento (SDST), com desinfestação com tegumento (CDCT) e com desinfestação sem tegumento (CDST). A incidência (%) dos fungos foi avaliada sob microscópio estereoscópico binocular. Para o teste de patogenicidade em plântulas e frutos inocularam-se suspensões de 10(6) esporos e discos de BDA com micélio, respectivamente. Para os fungos fitopatogênicos avaliaram-se a transmissibilidade fruto-semente e semente-plântula. O tratamento SDCT permitiu a detecção de maior número de fungos. Os fungos identificados foram Colletotrichum gloeosporioides, C. capsici, Curvularia sp., Verticillium sp., Fusarium sp., Penicillium sp., Aspergillus sp., A. niger e Rhizopus sp. Apenas as espécies de Colletotrichum são patogênicas às plântulas e frutos. Para ambas espécies há transmissibilidade fruto-semente, entretanto não é observada transmissão semente-plântula.
Avaliação do potencial fisiológico de lotes de sementes de soja
Authors: Santos Juliana Faria dos , Alvarenga Renata Oliveira , Timóteo Tathiana Silva , Conforto Elenice de Cássia , Marcos Filho Julio , Vieira Roberval Daiton
Published: January 2012

Vários procedimentos são utilizados para avaliar o potencial fisiológico de sementes, sendo fundamental a utilização daqueles que reflitam melhor o desempenho em campo. A pesquisa teve como objetivo avaliar o potencial fisiológico de sementes de soja por meio de testes de avaliação rápida, de vigor, de emergência de plântulas em campo e análise computadorizada de imagens (SVIS®), procurando identificar o procedimento mais eficiente na separação de lotes. Cinco lotes das cultivares BRS Valiosa RR e CD 208 foram avaliados em duas épocas (antes e após armazenamento) pelos testes de germinação, de avaliação rápida (embebição em água e pH do exsudato), de vigor (envelhecimento acelerado e condutividade elétrica), de emergência de plântulas em campo e análise computadorizada de imagens (SVIS®). Os testes de germinação em areia, de condutividade elétrica e de embebição em água foram eficientes na separação dos lotes, mas apenas este último possibilitou identificar diferenças consistentes entre os lotes nos dois períodos avaliados. Assim, o teste de embebição em água pode ser considerado promissor na composição de programas de controle de qualidade.
Apontamentos para a arquitetura hospitalar no Brasil: entre o tradicional e o moderno
Authors: Costa Renato Gama-Rosa
Published: January 2012

Aponta desafios para aprofundar a relação nem sempre evidente entre história da assistência em saúde e arquitetura, expressa de forma mais clara na construção dos espaços para tratamento médico, sobretudo os hospitais e os sanatórios. Estamos diante da constituição de um campo de conhecimento pouco explorado, que vem animando pesquisadores das ciências humanas e sociais aplicadas no Brasil, sobretudo nas últimas décadas.
Simulação termodinâmica e sua aplicação na avaliação do desempenho de materiais refratários
Authors: Luz A. P. , Pandolfelli V. C.
Published: January 2012

A corrosão, oxidação e o desgaste de materiais refratários têm sido objeto de vários estudos ao longo dos últimos anos. Por se tratarem de fenômenos complexos que ocorrem em temperaturas elevadas e em condições extremas de uso, a aplicação de simulações termodinâmicas na avaliação do desempenho destes materiais tem ganho cada vez mais destaque. Com o objetivo de verificar quais os tipos de cálculos que podem ser elaborados e quais as vantagens e desvantagens deste tipo de análise, neste trabalho é proposto o uso do programa FactSage® no estudo do desempenho de diversos refratários. O propósito deste trabalho vai além de uma simples revisão dos cálculos já efetuados na literatura, uma vez que várias outras simulações termodinâmicas foram elaboradas e discutidas. Os resultados destas avaliações comprovam que as informações provenientes destas análises podem auxiliar no entendimento das etapas e reações envolvidas na corrosão e desgaste dos refratários. No entanto, nenhum indicativo dos aspectos cinéticos e da distribuição espacial de cada produto de reação formado é fornecido nestes cálculos. Assim, para o completo entendimento dos mecanismos de reação são necessárias ambas as análises, termodinâmica e microestrutural.
Relevância dos conhecimentos, habilidades e métodos instrucionais na perspectiva de estudantes e profissionais da área contábil: estudo comparativo internacional
Authors: Ott Ernani , Cunha Jacqueline Veneroso Alves da , Cornacchione Júnior Edgard Bruno , De Luca Márcia Martins Mendes
Published: January 2012

Com o incentivo dos estudos de Albrecht e Sack (2000), Francisco e Kelly (2002) e com base na Taxonomia de Bloom (1956), o objetivo deste trabalho consiste em comparar a percepção de estudantes de cursos de Ciências Contábeis em Instituições de Ensino Superior (IES) brasileiras e profissionais da Contabilidade no Brasil quanto aos conhecimentos, habilidades e métodos de ensino-aprendizagem considerados como mais importantes para a atuação do contador no mercado de trabalho. O estudo contou com uma amostra de 1.710 sujeitos: 769 estudantes matriculados em cursos de graduação em Ciências Contábeis em IES brasileiras e 941 contadores registrados nos Conselhos Regionais de Contabilidade de várias regiões brasileiras, que responderam ao questionário desenvolvido por Lin, Xiong e Liu (2005) sobre a importância atribuída pelos respondentes aos quesitos conhecimento, habilidades e métodos de ensino-aprendizagem. Os resultados encontrados evidenciaram maiores níveis de importância percebida pelos profissionais (quando comparados aos estudantes) nos quesitos investigados. Comparativamente com a China e com os EUA, os escores dos profissionais brasileiros são sempre maiores para as três dimensões (conhecimentos, habilidades e métodos). Os estudantes brasileiros em comparação com os chineses, de forma geral, também atribuem maior importância para as três dimensões analisadas. Os elevados escores apontados pelos respondentes brasileiros merecem atenção por parte dos gestores das IES, levando em conta a intensidade das mudanças de perfil dos jovens estudantes e a velocidade das alterações do mercado profissional. Destaque-se que esses resultados devem ser mais explorados, analisando-se as suas razões, inferindo-se que o contexto atual da Contabilidade no Brasil, decorrente do processo global de harmonização das normas internacionais, é cenário propício para explicações a esse respeito.
Environmental variables and Piper assemblage composition: a mesoscale study in the Madeira-Purus interfluve, Central Amazonia
Authors: Bernardes Carolina , Capellotto Costa Flávia Regina
Published: January 2012

This study aimed to determine the effects of canopy openness, litter depth, soil cation content and texture on Piper assemblage composition at a mesoscale. Piper assemblage composition and environmental variables were inventoried in 41 0.125 ha (250 × 5 m) plots placed in a terra firme forest located in the Madeira-Purus interfluve, Central Amazonia. Ordination of the 41 plots by Non-metric Multidimensional Scaling (NMDS) in one dimension captured 58% of the floristic variation and was used as the response variable in multiple regression models. Environmental variables explained 39% of the variation in Piper assemblage composition, which was significantly related to litter depth, soil texture and canopy openness, but not to the cation content. Effects of edaphic components on plant assemblage structure have been reported for different plant groups, however the strong effect of litter depth at a mesoscale had not yet been demonstrated. We suggest that litter depth variation not only influences the structure of Piper assemblages, but also of other plant groups at a mesoscale, as this environmental variable has a direct or indirect effect on species germination and establishment.
Relative abundance and reproductive tactics of a Loricariidae species at Saraiva Lagoon, Ilha Grande National Park, MS-PR, Brazil
Authors: Bailly Dayani , Batista-Silva Valéria Flávia , Abelha Milza Celi Fedatto , Kashiwaqui Elaine Antoniassi Luiz , Fernandes Carlos Alexandre , Carvalho Edson Dias de
Published: January 2012

This study aimed to evaluate population abundance patterns and the main events in the reproductive cycle of Loricariichthys platymetopon at Saraiva Lagoon, Ilha Grande National Park, MS-PR, Brazil. Monthly samplings were conducted from October 2004 to September 2005 in three sections of the lagoon: entrance, middle and end, which resulted in the capture of 175 individuals. Spatial and temporal variation in abundance was obtained through CPUE (number of captured individuals/1000 m² of gillnets in 12 hours). The reproductive tactics considered were: duration, time and location of spawning, oocyte diameter and fecundity. The highest relative abundance was recorded in February, in the middle section of the lagoon, and the reproductive period lasted from September to February. The prevalence of females with spent ovaries and at rest in the following months indicated that reproductive activity ceased during autumn and winter. We observed that reproduction was high at the end section of the lagoon. The recorded mean oocyte diameter was 1.67 (SD ± 0.76) mm, mean absolute fecundity was 962.1 (SD ± 382.48) oocytes, and relative fecundity was 7.60 (SD ± 2.25) oocytes/g and 5.13 (SD ± 0.75) oocytes/cm. These tactics, probably are related to the settlement of L. platymetopom in Saraiva Lagoon, as well as in the different biotopes of the Upper Paraná River floodplain.
Fruit-feeding butterflies guide of subtropical Atlantic Forest and Araucaria Moist Forest in State of Rio Grande do Sul, Brazil
Authors: Santos Jessie Pereira dos , Iserhard Cristiano Agra , Teixeira Melissa Oliveira , Romanowski Helena Piccoli
Published: January 2012

This study presents a compilation of fruit-feeding butterflies species for Rio Grande do Sul Atlantic Forest aiming to be a tool for identification of these lepidopterans from two phytophysiognomies of this biome. Samples were carried out for more than four years with entomological nets and bait traps techniques in areas of Subtropical Atlantic Forest (SAF) and Araucaria Moist Forest (AMF). Seventy-six butterfly species were recorded in this region of Atlantic Forest, 60 species for SAF and 53 for AMF. Fruit-feeding butterflies represent about 50% of the total species richness of the Nymphalidae recorded for the region, a value of the same order of those found for similar studies in tropical forests regions. Dasyophthalma rusina is a new record for Rio Grande do Sul.
Diatomáceas perifíticas em Potamogeton polygonus Cham. & Schltdl.: citações pioneiras para o estado do Paraná
Authors: dos Santos Eloési Machado , Tremarin Priscila Izabel , Ludwig Thelma Alvim Veiga
Published: January 2012

Diatomáceas perifíticas em Potamogeton polygonus Cham. & Schltdl.: citações pioneiras para o Estado do Paraná. Realizou-se o estudo taxonômico das diatomáceas perifíticas associadas à macrófita aquática Potamogeton polygonus. Espécimes da macrófita foram coletados em fevereiro, maio e novembro/2005 e março/2006, em uma lagoa artificial e no rio Salto Amazonas, ambos localizados em fazendas no município de General Carneiro, Paraná. Baseados na análise de lâminas permanentes com material perifítico oxidado registraram-se cento e quarenta e sete táxons, sendo 55 exclusivos do ambiente lêntico, 34 exclusivos do ambiente lótico e 58 observados em ambos locais. As famílias mais representativas foram Eunotiaceae (13,6%), Pinnulariaceae (11,6%) e Naviculaceae (9,6%). Os gêneros com maior número de espécies e variedades foram Eunotia com 20 táxons e Pinnularia com 17. O estudo contribuiu com 18 novas citações para o Estado do Paraná.
Identificação de marsupiais do Rio Grande do Sul através da microestrutura dos pelos-guarda
Authors: Abreu Maury Sayão Lobato , Christoff Alexandre Uarth , Vieira Emerson Monteiro
Published: January 2012

A análise dos padrões microscópicos de pelos de mamíferos é uma técnica não-invasiva que pode auxiliar na identificação dos marsupiais brasileiros. O objetivo deste trabalho foi identificar padrões microscópicos dos pelos-guarda (cutícula e medula) de marsupiais ocorrentes no Rio Grande do Sul (RS), propondo uma chave dicotômica para sua identificação a partir dessas estruturas. Além disso, nós apresentamos, com detalhes, os padrões tricológicos de espécimes do gênero Monodelphis, um gênero ainda taxonomicamente obscuro que requer revisão no RS. Obtivemos o material analisado por meio da coleta de pelos de marsupiais capturados em campo ou provenientes de coleções de diferentes instituições. Identificamos os padrões dos pelos de dez espécies de marsupiais: Caluromys lanatus, Chironectes minimus, Didelphis aurita, Didelphis albiventris, Cryptonanus guahybae, Gracilinanus agilis, Gracilinanus microtarsus, Lutreolina crassicaudata, Micoureus paraguayanus e Philander frenatus. Os indivíduos do gênero Monodelphis foram analisados em conjunto, como parte do grupo dimidiata. Encontramos três padrões dentro desse grupo, sugerindo que possa haver uma terceira espécie além das duas normalmente reconhecidas (M. brevicaudis e M. dimidiata). A análise dos padrões microscópicos dos pelos possibilitou a identificação, com sucesso, da grande maioria das espécies à que pertencem os marsupiais do Rio Grande do Sul. Os resultados obtidos sugerem que as duas espécies de Monodelphis grupo dimidiata possam ocorrer com uma distribuição distinta no estado, estando uma presente principalmente na porção norte e a outra na porção leste do RS, com sobreposição na região central.
Anastrepha species (Diptera: Tephritidae), their hosts and parasitoids in southern Amapá State, Brazil
Authors: Silva Ricardo Adaime da , Lima Adilson Lopes , Xavier Samara Larissa Oliveira , Silva Wilson Rodrigues da , Marinho Cláudia Fidelis , Zucchi Roberto Antonio
Published: January 2012

This work was carried out to record the species of Anastrepha, their host plants and associated parasitoids in Laranjal do Jari and Vitória do Jari, Amapá State. Fleshy fruits of 17 species of 13 families were sampled, from February to July of 2006, in main districts of both municipalities. Nine species of Anastrepha and six species of braconid parasitoids were sampled during this study.
Avaliação do perfil dos profissionais da área de Ortodontia quanto às condutas legais
Authors: Paranhos Luiz Renato , Salazar Marcio , Torres Fernando César , Pereira Antônio Carlos , Silva Rhonan Ferreira da , Ramos Adilson Luiz
Published: January 2012

OBJETIVO: avaliar as condutas legais e o comportamento na relação profissional/paciente utilizadas pelos cirurgiões-dentistas atuantes na área de Ortodontia. MÉTODOS: a população objeto do presente estudo foi constituída de 525 profissionais com cadastro na Editora Dental Press (Maringá/PR). A pesquisa foi realizada por meio de um questionário contendo 17 perguntas dirigidas a esses profissionais. RESULTADOS E CONCLUSÕES: a maioria da população consultada é especialista em Ortodontia; 75% dos profissionais utilizam algum tipo de contrato no consultório e/ou clínica; 73,7% dos profissionais solicitam periodicamente radiografias de controle; grande parte dos profissionais (58,9%) arquiva a documentação do paciente por toda a vida. Os profissionais consultados apresentam um bom conhecimento do Código de Ética Odontológica, principalmente do Capítulo XIV - da Comunicação.
Abnormal Audit Fees and Restatements
Authors: Blankley Alan I. , Hurtt David N. , MacGregor Jason E.
Published: January 2012

We investigate the relationship between audit fees and subsequent financial statement restatements in the years following the Sarbanes-Oxley Act of 2002 (SOX). After controlling for internal control quality, we find that abnormal audit fees are negatively associated with the likelihood that financial statements are subsequently restated. This result conflicts with prior work that finds that audit fees are positively associated with future restatements. Overall, our evidence is consistent with the notion that restatements reflect low audit effort or underestimated audit risk in the periods leading up to the restatement year.
Improving Student Satisfaction in a First-Year Undergraduate Accounting Course by Team Learning
Authors: Opdecam Evelien , Everaert Patricia
Published: January 2012

This paper discusses student satisfaction and course experiences of first-year undergraduate students in an introductory financial accounting course where team learning was implemented during tutorials. Course experiences and satisfaction, as perceived by students in the team learning condition, were compared to those in a traditional lecture-based control condition. A post-experimental questionnaire, with open and closed-ended questions, was administered. Students reported significantly higher levels of satisfaction in the team learning condition and a more positive course experience compared to students in the lecture-based condition. The increased time spent on accounting in the team learning condition resulted in increased learning, as evidenced by higher grades on the final exam in the team learning condition. An analysis of open-ended questions revealed that both learning conditions fit for particular students. High pre-class preparation was considered a strength of the team learning condition, while the comprehensive explanation by the teacher was the most frequently mentioned advantage of the lecture-based condition. This paper further contributes to the practice of accounting education by illustrating a way to implement team learning in a large undergraduate accounting course.
Uniformly bounded set-valued Nemytskij operators acting between generalized Hölder function spaces
Authors: Matkowski Janusz , Wróbel Małgorzata
Published: January 2012

We show that the generator of any uniformly bounded set-valued Nemytskij composition operator acting between generalized Hölder function metric spaces, with nonempty, bounded, closed, and convex values, is an affine function.
Models of T cell antigen receptor activation: the puzzle still remained
Authors: Deswal Sumit
Published: January 2012

T cell antigen receptor (TCR) is a protein-complex expressed on all T cells of the immune system and is responsible for the activation of T cells when infectious agent is presented by an antigen presenting cell (APC) in the form of peptides bound to the major histocompatibility complex (pMHC). Despite numerous studies it is not clear what biochemical changes upon binding of antigen ligand to the extracellular domains of TCR leads to activation of intracellular signaling (a process known as TCR triggering). This review summarizes possible biochemical mechanisms for TCR triggering and discusses their comparative limitations and advantages in explaining various experimental observations.Keywords: T cell antigen receptor; activation; modelDOI: http://dx.doi.org/10.3126/njb.v2i1.5684Nepal Journal of Biotechnology Jan.2012, Vol.2(1): 62-71
A Laboratory Based Study On The Movement Of Radiocaesium In Some Soil Columns By Gamma Spectrometer
Authors: Haque MM , Ghose S , Islam SMA
Published: January 2012

The fate and movement of 137Cs in different types of soil profiles of Chittagong City and Ishwardi Upazila of Bangladesh were investigated with laboratory based column method by γ-spectrometer. The diffusion coefficient, distribution coefficient and retardation factors of 137Cs were measured. The physio-chemical characteristics and radioactive concentration of natural radionuclides of the soil samples were also measured. The maximum diffusion coefficient was found 2.06 X 10-5 cm2/s in the investigated soils. The vertical movement of 137Cs in those soil samples found to be slow. Maximum of clay content corresponded with the maximum of retardation factor and with the minimum of diffusion coefficient. This experimental findings demonstrated that caesium is strongly absorbed in soil particles and therefore, do not pose any threat to ground water contamination by the approximated future accidental release of 137Cs in the study area. Moreover, the locally available clay can be used as an adsorbent for the decontamination of liquid radioactive waste generated at nuclear facilities without any pretreatment. Key words: Radioisotopes; Physio-chemical; Transport parameters; Soil column DOI: http://dx.doi.org/10.3329/jbas.v35i2.9417 JBAS 2011; 35(2): 141-151
Characterization And Curie Temperature Of Co Doped Ni-Zn Perminvar Ferrite
Authors: Rana MD Sohal , Sinha Rabindra Chandra , Saha DK
Published: January 2012

Ni-Zn perminvar ferrites having the compositions Co0.02Zn0.20Ni0.58Fe2.2O4 and Co0.02Zn0.28 Ni0.50Fe2.2O4 were prepared through the solid state reaction using conventional ceramic method. The homogeneous phase of perminvar ferrites has been observed from the study of X-ray diffraction. Lattice parameter of the samples was found to be 8.369, 8.372 and 8.375Å for the sample Co0.02Zn0.20Ni0.58Fe2.2O4 and 8.382, 8.383 and 8.384Å for the sample Co0.02Zn0.28 Ni0.50Fe2.2O4 sintered at 1200, 1300 and 1350°C respectively. Both the bulk density and porosity decreases with Zn content and sintering temperatures. The values of Curie temperature of the two compositions were found to be 511, 508 and 508°C (for TS = 1200, 1300 and 1350°C) for the sample of Co0.02Zn0.20Ni0.58Fe2.2O4 and 460 and 455°C (for Ts = 1300 and 1350°C) for the sample of Co0.02Zn0.28Ni0.50Fe2.2O4, respectively. Frequency dependence permeability spectra, revealed that permeability of all the samples is almost independent of frequency up to 1 MHz. It is observed that permeability increases with Zn content and hence the relative quality factor decreases with increasing Zn content. Key words: Perminvar ferrite; Curie temperature; Initial permeability; Quality factor DOI: http://dx.doi.org/10.3329/jbas.v35i2.9421 JBAS 2011; 35(2): 171-178
Crystallization Of Zinc Sulphate Single Crystals And Its Structural, Thermal And Optical Characterization
Authors: Saha JK , Podder J
Published: January 2012

Zinc sulphate (ZnSO4.7H2O), an inorganic material has been crystallized by an isothermal evaporation method. ZnSO4.7H2O is highly soluble in water and the solubility is found to be increased almost linearly with the increase of temperature. At room temperature around 34°C, the solubility was found to be 92.41 gm/50 ml. The FT-IR spectroscopy was performed on pure zinc sulphate crystals to identify the presence of functional groups. The grown crystals have been subjected to powder X-ray diffraction to determine the unit cell dimensions and the crystal structure. The lattice parameters are found to be, a = 9.9810 Å, b = 7.2500 Å and c = 24.2800 Å, respectively. The values were in good agreement with those of the reported values. The TGA and DTA study revealed that the grown crystals have good thermal stability. The UV-vis spectrum showed that the material has wide optical transparency in the Ultra-violet region. Key words: Isothermal evaporation; Crystatization; Zinc sulphate; Structural characterization DOI: http://dx.doi.org/10.3329/jbas.v35i2.9426 JBAS 2011; 35(2): 203-210
Studies On The Electrical Properties Of Cu Substituted Li-Ferrites
Authors: Ullah M Samir , Hoque S Manjura , Khan FA , Noor Saroaut , Hakim MA , Saha DK
Published: January 2012

Polycrystalline Li-Cu mixed ferrites were prepared by double sintering ceramic technique. Cu substituted Li ferrites having the general formula Li0.5-x/2CuxFe2.5-x/2O4 where, x = 0.0 to 1.0 and the samples were sintered at 1100°C for 3 hours in the normal atmosphere. The prepared samples were confirmed in the spinel structure by the X-ray diffraction method. The lattice parameter and porosity were calculated for different compositions. The electrical resistivity and dielectric constant have been investigated as a function of composition and temperature. It was observed that the resistivity decreased with increasing temperature and exhibited semiconducting nature of the sample. The compositional variation of resistivity and dielectric constant showed inversed trend with each other at room temperature for Cu content, x > 0.3. This was found to support the electron hopping conduction mechanism. The dielectric constant increased slowly with temperature in the beginning and after that dielectric constant increased rapidly for different samples. As the temperature increased, thermal energy provided to the sample played an important role to decrease the relaxation time and hence there was an increase in dielectric constant. Dielectric constant has been observed as a function of frequency and it decreased with increasing frequency. Key words: Electrical resistivity; Porosity; Dielectric constant; Electron hopping DOI: http://dx.doi.org/10.3329/jbas.v35i2.9428 JBAS 2011; 35(2): 221-228
Positron Emission Tomography (PET) in Clinical Medicine and Bangladesh Perspective
Authors: Majumder MSH
Published: January 2012

Positron emission tomography (PET) imaging devices were first developed in the 1970. In the last thirty years PET imaging has been extensively used in research, but only in the last few years the technology has become more widely available for clinical applications. Most of the early works with PET focused on brain metabolism, partly because of the smaller size of detector needed to study head. With the introduction of improved instruments and suitable radionuclide, applications in oncology have developed into the major clinical uses of PET. Myocardial viability is usually assessed using perfusion studies with Signal photon emission computed tomography (SPECT) but in case of inconclusive result, metabolic assessment with short-lived PET tracers may be more decisive. PET allows study of body function; it helps detection of alterations in biochemical processes that suggest disease before changes in anatomy are apparent with other imaging tests, such as computed tomography (CT) or magnetic resonance imaging (MRI). The future of PET imaging is bright. New geometries are being studied especially to develop organ specific imaging devices, new detector materials are being developed and techniques for reconstruction are improving. However, perhaps the most important need for further utilization of PET imaging is the development of new radiopharmaceuticals or radiotracer compounds and better understanding of cellular physiology and metabolism in disease states. Until recently, Bangladesh had no positron emission tomography scanner, though the neighboring countries like India, Pakistan, Thailand & Singapore have PET scanning for last several years. PET scanning in Bangladesh has been introduced by a multidisciplinary tertiary level private hospital – United Hospital, Gulshan, Dhaka recently. Key Words: Position emission tomography; Positron 18; Flurodeoxyglucose DOI: http://dx.doi.org/10.3329/jbcps.v29i3.9436 JBCPS 2011; 29(3): 151-157
Caudal Regression Syndrome - A Case Report and Literature Review
Authors: Begum S , Shelim R , Begum T , Nahar N
Published: January 2012

Background and Purpose: Caudal regression syndrome (CRS) is a rare congenital abnormality in which a segment of the spine and spinal cord fails to develop. The severity of the morphologic derangement inversely correlates with residual spinal cord function. The caudal regression syndrome is frequently associated with maternal diabetes. The exact etiology is elusive, though maternal diabetes is one of the important factor; genetic factors, and hypoperfusion might play roles. Recently, the role of teratogens has been studied in animal. Here we report a case of CRS of a newborn baby of diabetic mother. Methods: The history of the patient was taken from parents and physical examination was done. Plain radiographs, USG of abdomen and other investigations were done for evaluation. Results: Agenesis of lower three thoracic, lumbar and sacral vertebrae with multiple congenital anomalies were observed. Lower limbs showed hypoplastic and talipes equinovarus. Hip joints were fixed, flexion contracture of the knees and webbing of Popliteal fossa were present. Other anomalies were dextrocardia and duplex right kidney. Conclusion: CRA is a rare congenital anomaly associated with maternal diabetes. Control of diabetes is necessary to reduce the risk of occurrence. DOI: http://dx.doi.org/10.3329/jbcps.v29i3.9439 JBCPS 2011; 29(3): 166-169
Induction of Apoptosis in Human Breast Adenocarcinoma Cells MCF-7 by Monapurpyridine A, a New Azaphilone Derivative from Monascus purpureus NTU 568
Authors: Hsu Li-Chuan , Hsu Ya-Wen , Liang Yu-Han , Liaw Chia-Ching , Kuo Yao-Haur , Pan Tzu-Ming
Published: January 2012

A new azaphilonidal derivative, monapurpyridine A (MPA), has recently been isolated from the fermented products of Monascus purpureus NTU 568. The structure of MPA was elucidated by nuclear magnetic resonance (1H-NMR, 13C-NMR, COSY, HMQC, and HMBC) and other spectroscopic analyses. Biological evaluation revealed that MPA could induce cell death in human breast adenocarcinoma cells MCF-7, and it has no significant toxicity to normal mammary epithelial cells M10. The MTT assay and flow cytometric analysis were employed to investigate cell viability and cell cycle influenced by MPA. Moreover, we used Western blot and caspase activity assay to demonstrate the activation of caspase-3, -8 and -9 resulted from MPA. All evidence supported that MPA was suitable for developing into a chemotherapeutic or chemopreventive agent against breast cancer.
Gamma Irradiation Increases the Antioxidant Properties of Tualang Honey Stored Under Different Conditions
Authors: Khalil Md. Ibrahim , Sulaiman Siti Amrah , Alam Nadia , Moniruzzaman Mohammed , Bai’e Saringat , Man Che Nin , Jamalullail Syed Mohsin Sahil , Gan Siew Hua
Published: January 2012

This study was conducted to evaluate the effects of evaporation, gamma irradiation and temperature on the total polyphenols, flavonoids and 1,1-diphenyl-2-picrylhydrazyl (DPPH) radical-scavenging activities of Tualang honey samples (n = 14) following storage over three, six or twelve months. The mean polyphenol concentrations of the six gamma irradiated honey samples at three, six and twelve months, respectively, were 96.13%, 98.01% and 102.03% higher than the corresponding values of the eight non-gamma irradiated samples. Similarly, the mean values for flavonoids at three, six and twelve months were 111.52%, 114.81% and 110.04% higher, respectively, for the gamma irradiated samples. The mean values for DPPH radical-scavenging activities at three, six and twelve months were also 67.09%, 65.26% and 44.65% higher, respectively, for the gamma irradiated samples. These data indicate that all gamma irradiated honey samples had higher antioxidant potential following gamma irradiation, while evaporation and temperature had minor effects on antioxidant potential.
Local Area Water Removal Analysis of a Proton Exchange Membrane Fuel Cell under Gas Purge Conditions
Authors: Lee Chi-Yuan , Lee Yu-Ming , Lee Shuo-Jen
Published: January 2012

In this study, local area water content distribution under various gas purging conditions are experimentally analyzed for the first time. The local high frequency resistance (HFR) is measured using novel micro sensors. The results reveal that the liquid water removal rate in a membrane electrode assembly (MEA) is non-uniform. In the under-the-channel area, the removal of liquid water is governed by both convective and diffusive flux of the through-plane drying. Thus, almost all of the liquid water is removed within 30 s of purging with gas. However, liquid water that is stored in the under-the-rib area is not easy to remove during 1 min of gas purging. Therefore, the re-hydration of the membrane by internal diffusive flux is faster than that in the under-the-channel area. Consequently, local fuel starvation and membrane degradation can degrade the performance of a fuel cell that is started from cold.
The Effects of Digestion Enzymes on Islet Viability and Cellular Composition
Authors: Iglesias Itzia , Valiente Luis , Shiang Keh-Dong , Ichii Hirohito , Kandeel Fouad , Al-Abdullah Ismail H.
Published: January 2012

The choice of enzyme blend is critical for successful islet isolation. Islet yield, viability, integrity, and function are important factors that influence the outcome of islet transplantation. Liberase HI has been used as a standard enzyme for pancreas digestion and has successfully produced islets that reversed diabetes. However, the replacement of Liberase HI with collagenase NB1 has significantly influenced the process outcome, both in quality and quantity of the isolated islets. The assessment of islet cells by Flow Cytometry (FC) has been reported to be useful for evaluating islet quality. The aim of this study was to assess the isolation outcomes and islet quality when comparing human islet cell processed with Liberase HI and NB1. A total of 66 islet isolations, 46 processed using Liberase HI and 20 using Serva NB1, were retrospectively analyzed. Islet yield, function in vitro, islet cell viability by FC, as well as isolation-related factors were compared. There was no significant difference in donor characteristics such as age and height; however, body mass index (BMI) in the Liberase HI group was significantly higher. There was also no significant difference in prepurification, postisolation, or postculture IEQ or percent recovery between the two groups. Flow data showed Liberase HI preparations had a significantly higher percent of live cells (DAPI-) and NG+/ TMRE+ when compared to NB1. Stimulation Indices (SI) for Liberase HI ( n = 45) showed 3.17 and NB1 ( n = 18) 2.71 ( p = NS). The results of Annexin V/DAPI staining for live, apoptotic, and necrotic cells were 50.7 ± 2.24%, 14.4 ± 1.02%, and 27.8 ± 1.92% for Liberase HI versus 48.1 ± 1.93%, 12.3 ± 0.92%, and 33.9 ± 2.28% for NB1. Islets isolated using Liberase HI showed higher viable β cells by NG/TMRE staining and decreased necrosis by Annexin V/DAPI staining. FC assessment may be useful for determining the choice of digestion enzyme to maximize viable islets.
Combined Mesenchymal Stem Cell Sheets and rhBMP-2-Releasing Calcium Sulfate–rhBMP-2 Scaffolds for Segmental Bone Tissue Engineering
Authors: Qi Yiying , Wang Yulu , Yan Weiqi , Li Hang , Shi Zhongli , Pan Zhijun
Published: January 2012

Repair of segmental bone defects remains a major challenge for orthopedic surgeons. This study aimed to investigate whether recombinant human bone morphogenetic protein-2 (rhBMP-2)-loaded calcium sulfate (CS) combined with mesenchymal stem cell (MSC) sheets could accelerate bone regeneration in ulnar segmental defects of rabbits. In vitro, the osteogenic differentiation of MSCs cultured on rhBMP-2-loaded CS was investigated. Forty complete 1.2-cm bone defects were treated with CS (group A), rhBMP-2-loaded CS (group B), MSC sheet-wrapped CS (group C), and MSC sheet-wrapped rhBMP-2-loaded CS (group D). At 4 and 8 weeks after implantation, the samples were treated by X-ray, microcomputed tomography, and histological observation. The rhBMP-2 could be released from the rhBMP-2-loaded CS scaffolds and maintain its bioactivity. The alkaline phosphatase (ALP) of MSCs cultured on rhBMP-2-loaded CS was significantly higher than that of CS at both 7 and 14 days ( p < 0.05). The defects treated with MSC sheet-wrapped rhBMP-2-loaded CS showed significantly higher scores by X-ray analysis and more bone formation determined by both histology and microcomputed tomography than the other three groups at both 4 and 8 weeks after implantation ( p < 0.05). No significant difference in X-ray score and bone formation was found between groups B and C, both significantly higher than group A ( p < 0.05). The results suggested that MSC sheet-wrapped rhBMP-2-loaded CS may be an effective approach to promote the repair of segmental bone defects and has great potential for repairing large segmental bone defects in clinic.
ANALYSIS OF ANGLE MEASUREMENTS AND A NEW APPROACH TO VERTICAL ANGLE CALIBATION / VERTIKALIŲJŲ KAMPŲ KALIBRAVIMO ANALIZĖ IR NAUJI KALIBRAVIMOBŪDAI / AНAЛИЗ УГЛOВЫХ ИЗМЕРЕНИЙ И НОВЫE МEТOДЫ КАЛИБРИРOВАНИЯ
Authors: Šiaudinytė Lauryna , Rybokas Mindaugas , Giniotis Vytautas
Published: January 2012

Testing and calibrating geodetic instruments is an important metrological procedure for precise instrumentation used in industry and geodesy. Electronic geodetic measuring instruments consist, among other elements, of circular scales and angular encoders for angle determination in two perpendicular horizontal and vertical planes. The accuracy of the instrument mostly depends on the accuracy of angle standards used for angle calibration in the horizontal plane. Although many methods are developed for angle calibration, the majority of those are not available for calibrating angles in the vertical plane. The method described in the International Standards of vertical angle calibration validates field testing geodetic instruments by taking precise angle readings between the calibrated points placed at long distance and height. Difficulties in creating such calibration basis and inconveniencies in proceeding with this field at long distances may appear. Also, the traceability of length and angle measurements is not ensured. The new method of calibrating the angles in the vertical plane for geodetic instruments was developed. The article describes the principle of indoor testing and the calibration of the vertical angle measuring system.

Santrauka

Daugelyje optinių elektroninių matavimo prietaisų yra įmontuotos apskritiminės skalės, skirtos kampinei padėčiai dviejose statmenose plokštumose – horizontaliojoje bei vertikaliojoje nustatyti. Prietaiso tikslumas daugiausia priklauso nuo sių skalių tikslumo. Rastrinių skalių metrologija yra gana specifinė sritis, būtina tam tikra metodika ir kalibravimo įranga. Trumpai apžvelgus pateikiami kai kurie būdai ir priemonės, taikytini kampų metrologijai, ypač vertikaliam plokščiajam kampui kalibruoti.

Резюме

Многие оптико-электронные измерительные инструменты состоят из круговых шкал для определения углов в двух перпендикулярных плоскостях – горизонтальной и вертикальной. Точность инструмента в основном зависит от точности этих угломерных шкал. Метрология угловых растровыx шкал довольно специфична и требует специфических мeтодов и приспособлений для калибрирования. В статье приводится обзор и некоторые простые способы и приспособления, которые можно использовать в метрологии углов, в частности, в калибрировании вертикального плоского угла.
INVESTIGATION INTO MEASUREMENTS USING GRAVIMETERS SCINTREX CG-5 / MATAVIMŲ SCINTREX CG-5 GRAVIMETRAIS ANALIZĖ / АНАЛИЗ ИЗМЕРЕНИЙ, ПРОВЕДЕННЫХ ГРАВИМЕТРАМИ SCINTREX CG-5
Authors: Petroškevičius Petras , Birvydienė Rosita , Obuchovski Romuald , Paršeliūnas Eimuntas
Published: January 2012

The article investigates four automatic gravimeters Scintrex CG-5. With reference to the measurements of the gravimetric calibration base set up in Lithuania, linear scale coefficients and the character of changes in the linear scale coefficients of gravimeters were estimated. The paper examines the vertical gradient of gravity acceleration in the eight-floor building, evaluates the range of changes into gravimeter drifts under laboratory conditions and describes daily gravimeter drift during gravimetric measurements.

Santrauka

Atlikti keturių Scintrex CG-5 gravimetrų tyrimai. Remiantis gravimetrinės bazės, įrengtos Lietuvos teritorijoje, matavimų duomenimis, nustatyta gravimetrų kalibravimo koeficientai ir jų kitimo pobūdis. Atlikti sunkio pagreičio vertikaliojo gradiento aštuonių aukštų pastate tyrimai. Laboratorinėmis sąlygomis nustatytas gravimetrų paros nulio slinkties kitimo diapazonas. Atlikti gravimetrų nulio slinkties matavimų metu tyrimai.

Резюме

Проведены исследования четырех гравиметров Scintrex CG-5. На основании измерений гравиметрической базы, находящейся на территории Литвы, получены коэффициенты калибровки гравиметров. Проведены исследования вертикального градиента ускорения силы тяжести в восьмиэтажном здании. Определен диапазон изменения лабораторного суточного смещения нуль-пункта гравиметров. Также оценено смещение нуль-пункта гравиметров во время измерений гравиметрической базы.
INVESTIGATION INTO THE RATE OF CHANGES IN KEPLERIAN ORBITAL ELEMENTS FOR GPS SATELLITES UNDER SOLAR STORMING / GPS PALYDOVŲ ORBITŲ KEPLERIO ELEMENTŲ KITIMO DĖL SAULĖS AUDRŲ ĮTAKOS ANALIZĖ / АНАЛИЗ ИЗМЕНЕНИЙ ЭЛЕМЕНТОВ КЕПЛЕРА СПУТНИКОВЫХ ОРБИТ В СЛУЧАЕ СОЛНЕЧНЫХ БУРЬ
Authors: Zubinaitė Vilma , Preiss George
Published: January 2012

Positioning using a satellite requires defining the instantaneous positions of navigation satellites. The established positions are predicted and transmitted to the users applying satellites, and, however become degraded with accuracy in cases solar events divert the satellites from their path. Meanwhile, getting satellite coordinates with reference to the made predictions involves computing effort. The question addressed in this paper is whether orbit disturbances can be detected by examining these predictions so that computing coordinates are avoided.

The paper argues that detection is possible but requires further experiments on confirmation due to the fact there have been relatively few solar storms in recent years while collecting data on satellite tracking. also, the paper also suggests that detection by examining orbital parameters is of a limited practical value when compared with the ease of interpreting satellite coordinates measured in meters.

Santrauka

Padėtį nustatant globaline padėties nustatymo sistema turi būti žinomos akimirkinės dirbtinių Žemės palydovų padėtys orbitoje, tačiau dėl Saulės reiškinių įtakos dirbtiniai Žemės palydovai nukrypsta nuo jų judėjimo kelio. Išanalizavus teigiama, kad tiriant pasirinktuoju metodu galima nustatyti dirbtinių Žemės palydovų nukrypimus nuo įprastinės orbitos bei numatyti prognozes. Šiems teiginiams patvirtinti būtini tolesni eksperimentai.

Резюме

Для того, чтобы было известно мгновенное положение искусственных спутников Земли на орбите, требуется определение позиции с помощью системы глобального позиционирования. Однако точность позиций спутников на орбите уменьшается из-за событий на Солнце, вследствие чего искусственные спутники Земли отклоняются от пути их движения. В статье рассматривается вопрос, можно ли обнаружить погрешности на орбите искусственных спутников Земли и предвидеть прогнозы на основании выбранного метода. Утверждается, что изменения обнаружить можно, однако для подтверждения этого требуются дальнейшие эксперименты.