820 resultados para Value of complex use


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A serologic study was undertaken in a group of 43 patients with active paracoccidioidomycosis who were treated in the same form (ketoconazole), for identical periods of time (6 months), and folio wed-up for various periods posttherapy. The tests employed were agar gel immunodiffusion (AGID) and complement fixation (FC). Also studied were 50 sera from patients with proven histoplasmosis and pulmonary aspergilloma, 30 patients with culturaly proven tuberculosis as well as 92 specimens from healthy individuals, residents in the endemic area for paracoccidioidomycosis. A single lot of yeast filtrate antigen was used throughout the study. The value of each test was measured according to GALEN and GAMBINO6. Both tests were highly sensitive, 89 and 93% respectively. Regarding their specificity, the AGID was totally specific while the CF exhibited 96.6% and 97% specificity in front of tuberculosis patients and healthy individuals respectively and 82% in comparison with patients with other mycoses. The concept of predictive value, that is, the certainty one has in accepting a positive test as diagnostic of paracoccidioidomycosis, favored the AGID procedure (100%) over the CF test. The latter could sort out with 93% certainty a patient with paracoccidioidomycosis among a group of healthy individuals and with 97.5% in the case of TB patients; when the group in question was composed by individuals with other deep mycoses, such certainty was lower (81%). The above results indicate that both the AGID and the CF tests furnish results of high confidence; one should not relay, however, in the CF alone as a means to establish the specific diagnosis of paracoccidioidomycosis.

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A chromatographic separation of active ingredients of Combivir, Epivir, Kaletra, Norvir, Prezista, Retrovir, Trivizir, Valcyte, and Viramune is performed on thin layer chromatography. The spectra of these nine drugs were recorded using the Fourier transform infrared spectroscopy. This information is then analyzed by means of the cosine correlation. The comparison of the infrared spectra in the perspective of the adopted similarity measure is possible to visualize with present day computer tools, and the emerging clusters provide additional information about the similarities of the investigated set of complex drugs.

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Palaeodiversity 3: 59–87; Stuttgart 30 December 2010

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Leishmania braziliensis is a causative agent of American Cutaneous Leishmaniasis (ACL). The 034-JCG strain, isolated from a patient from the northern region of Paraná State, Brazil, was cultivated in Blood Agar Base medium, lyophilized and submitted to phenol-water extraction. The extract was treated with RNase I. The carbohydrate containing-antigen (Ag-CHO) was immunogenic to rabbits and showed at least a fraction with some negative charge at pH 8.2. This antigen showed cross-reactivity with the phenol-water extract of the growth medium used for the culture of promastigotes and with the surface antigens of promastigotes. Its composition is: 24.3% of total sugars, from which 11.2% of galactose, 7.5% of mannose and 5.6% of ribose. Protein content was 5.4% and phosphate 18.5%. The antigenic activity was maintained after: repeated freezing-thawing; lyophilization; heating at 100ºC for 30 minutes; treatment with RNase, trichloroacetic acid and sodium metaperiodate. The precipitin line obtained is Periodic Acid Schiff positive. The application of the Ag-CHO in counterimmunoelectrophoresis reaction for the immunodiagnosis of ACL showed 60% sensitivity, and no cross-reaction with the five sera of Chagas' disease patients tested. The use of this antigen in a more sensitive technique, with more samples of sera, may improve these results.

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In order to evaluate the role of the determination of adenosine deaminase activity (ADA) in ascitic fluid for the diagnosis of tuberculosis, 44 patients were studied. Based on biochemical, cytological, histopathological and microbiological tests, the patients were divided into 5 groups: G1 - tuberculous ascites (n = 8); G2 - malignant ascites (n = 13); G3 - spontaneous bacterial peritonitis (n = 6); G4 - pancreatic ascites (n = 2); G5 - miscelaneous ascites (n = 15). ADA concentration were significantly higher in G1 (133.50 ± 24.74 U/l) compared to the other groups (G2 = 41.85 ± 52.07 U/l; G3 = 10.63 ± 5.87 U/l; G4 = 18.00 ± 7.07 U/l; G5 = 11.23 ± 7.66 U/l). At a cut-off value of >31 U/l, the sensitivity, specificity and positive and negative preditive values were 100%, 92%, 72% and 100%, respectively. ADA concentrations as high as in tuberculous ascites were only found in two malignant ascites caused by lymphoma. We conclude that ADA determination in ascitic fluid is a useful and reliable screening test for diagnosing tuberculous ascites. Values of ADA higher than 31 U/l indicate more invasive methods to confirm the diagnosis of tuberculosis.

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This study aims to analyze which determinants predict frailty in general and each frailty domain (physical, psychological, and social), considering the integral conceptual model of frailty, and particularly to examine the contribution of medication in this prediction. A cross-sectional study was designed using a non-probabilistic sample of 252 community-dwelling elderly from three Portuguese cities. Frailty and determinants of frailty were assessed with the Tilburg Frailty Indicator. The amount and type of different daily-consumed medication were also examined. Hierarchical regression analysis were conducted. The mean age of the participants was 79.2 years (±7.3), and most of them were women (75.8%), widowed (55.6%) and with a low educational level (0–4 years: 63.9%). In this study, determinants explained 46% of the variance of total frailty, and 39.8, 25.3, and 27.7% of physical, psychological, and social frailty respectively. Age, gender, income, death of a loved one in the past year, lifestyle, satisfaction with living environment and self-reported comorbidity predicted total frailty, while each frailty domain was associated with a different set of determinants. The number of daily-consumed drugs was independently associated with physical frailty, and the consumption of medication for the cardiovascular system and for the blood and blood-forming organs explained part of the variance of total and physical frailty. The adverse effects of polymedication and its direct link with the level of comorbidities could explain the independent contribution of the amount of prescribed drugs to frailty prediction. On the other hand, findings in regard to medication type provide further evidence of the association of frailty with cardiovascular risk. In the present study, a significant part of frailty was predicted, and the different contributions of each determinant to frailty domains highlight the relevance of the integral model of frailty. The added value of a simple assessment of medication was considerable, and it should be taken into account for effective identification of frailty.

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Three 10 µg doses of the recombinant hepatitis B vaccine, manufactured by Instituto Butantan by original technology, were administered in a adult population, mean age 30 years old, following the 0, 1 and 6 months schedule immunization. The clinical trial was considered satisfactory in terms of immunogenicity (anti-HBs titers between 17.5-29500 IU/l, seroconversion 95.3%) and reactogenicity (no incapacitating side effects)

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Dissertation presented to obtain the Doutoramento (Ph.D.) degree in Biochemistry at the Instituto de Tecnologia Qu mica e Biol ogica da Universidade Nova de Lisboa

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Resumo A tumorigénese é um processo de transformação celular que se desenrola tipicamente em várias etapas. Os diferentes níveis de evolução tumoral resultam da acumulação sucessiva de mutações genéticas numa célula normal que lhe conferem uma vantagem selectiva no respectivo meio tecidular. As mutações podem manifestar-se sob a forma de alterações nucleotídicas pontuais ao nível da sequência de DNA, levando a uma desregulação da função proteíca ou à formação de proteínas não-funcionais, ou através de alterações cromossómicas numéricas ou estruturais. Na leucemia, por exemplo, os genes híbridos que resultam de translocações cromossómicas desempenham um importante papel no processo tumorigénico. Estes genes são transcritos sob a forma de um RNA mensageiro de fusão, o qual é traduzido numa proteína híbrida com função oncogénica. Frequentemente, os subtipos de doença leucémica estão associados com translocações cromossómicas que envolvem 2 pontos de quebra recorrentes e específicos. É disto exemplo a leucemia mielóide crónica, em que uma translocação recíproca entre os cromossomas 9 e 22 conduz à formação de um gene de fusão BCR-ABL1. Em diferentes subtipos de doença, existe também uma pequena proporção de casos que apresenta translocações cromossómicas complexas, que envolvem um ou mais pontos de quebra adicionais em outras localizações genómicas além das que estão implicadas na formação dos genes de fusão. Por vezes, os pontos de quebra estão também associados a delecções extensas de material genético que se pensa terem uma função importante na tumorigénese. No entanto, o papel destas regiões genómicas no desenvolvimento tumoral não tem sido um motivo recorrente de estudo. Neste contexto, o objectivo desta dissertação foi o de determinar o potencial papel tumorigénico de alterações génicas adicionais ocorridas nos pontos de quebra de translocações cromossómicas complexas. Para a prossecução do objectivo proposto, foram estudados 5 rearranjos cromossómicos distintos associados com diferentes tipos de doença hematológica maligna, nomeadamente a leucemia linfoblástica aguda de células B (2 casos), leucemia mielóide aguda, neoplasma mieloproliferativo e síndrome mielodisplásico/neoplasma ieloproliferativo, não classificável. O mapeamento dos pontos de quebra foi efectuado utilizando a hibridação fluorescente in situ e diferentes metodologias de biologia molecular, tendo como base a informação inicial da análise citogenética. Em casos seleccionados, o papel dos novos genes candidatos foi avaliado in vitro utilizando modelos de linhas celulares, nomeadamente no que respeita às funções de controlo da proliferação celular e de regulação transcricional. De entre os 5 casos estudados, quatro deles evidenciaram translocações complexas envolvendo 3 cromossomas, nomeadamente t(12;21;5)(p13;q22;q13), t(12;6;15)(p13;p24~25;q22), t(9;11;19)(p22;q23;p13) e t(X;20;16)(p11;q13;q23). No caso remanescente, foi observada uma translocação dicêntrica dic(9;12)(p11;p11) acompanhada de delecções extensas em ambos os pontos de quebra. Nos casos com t(12;21;5) e t(9;11;19) as translocações estavam associadas com a presença de genes de fusão recorrentes, nomeadamente TV6(12p13)-RUNX1(21q22) e TLL(11q23)-MLLT3(9p22), indicando que se tratavam de rearranjos complexos das translocações t(12;21) e t(9;11) associadas com a leucemia linfoblástica aguda de células B e a leucemia mielóide aguda, respectivamente. O papel dos pontos de quebra adicionais foi estudado em detalhe no caso com t(9;11;19). Através da metodologia de long distance inverse-polymerase chain reaction, foram identificados os pontos de quebra na sequência de DNA dos 3 cromossomas envolvidos na translocação. Além dos pontos de quebra nos genes MLL e MLLT3, foi observado que o local de quebra no cromossoma 19 interrompeu a sequência de um novo gene, designado CCDC94,conduzindo à sua haplo-insuficiência nas células com t(9;11;19). Através de ensaios de reverse transcription-polymerase chain reaction verificámos que o gene CCDC94 é expresso ubiquitariamente em tecidos humanos normais. A análise informática da sequência prevista da proteína CCDC94 indicou uma elevada identidade de aminoácidos com a proteína cwf16, envolvida na regulação do ciclo celular da levedura Schizosaccharomyces pombe. Através da clonagem do DNA complementar de CCDC94 em vectores de expressão, e após a transfecção destes em culturas de linhas celulares in vitro, observámos que este gene codifica uma proteína de localização exclusivamente nuclear. A expressão ectópica da proteína CCDC94 diminuiu a progressão do ciclo celular e a proliferação das células em cultura. Inversamente, a supressão do transcrito do gene CCDC94 através de interferência de RNA conduziu a um aumento significativo da proliferação celular, confirmando que CCDC94 regula negativamente a proliferação e a progressão do ciclo celular. Estes resultados mostram que os pontos de quebra adicionais, presentes em translocações cromossómicas complexas em leucemia, podem resultar na haplo-insuficiência de genes controladores dos mecanismos proliferativos, cooperando desta forma com a acção das proteínas de fusão para proporcionar ao clone leucémico uma proliferação celular descontrolada. Nos restantes 3 casos estudados não foram identificados genes de fusão. Ao invés, todos aqueles apresentaram delecções de extensão variável associadas com os pontos de quebra cromossómicos. No caso com t(12;6;15), identificámos uma delecção de 1.2 megabases de DNA na banda 12p13 que resultou na eliminação de 9 genes incluindo ETV6 e CDKN1B. O gene ETV6 codifica um factor de transcrição que é essencial para a formação das diferentes linhagens hematopoiéticas na medula óssea, enquanto CDKN1B é traduzido numa proteína responsável por bloquear a entrada das células na fase G1 do ciclo celular e,consequentemente, por travar a proliferação celular. Neste contexto, os resultados obtidos indicam que a perda simultânea de ETV6 e de CDKN1B, através de uma translocação cromossómica complexa, constituiu uma acção cooperativa na leucemogénese. A mesma noção pode aplicar-se ao caso com dic(9;12), no qual pelo menos 2 genes que codificam para factores de transcrição importantes na linhagem hematopoiética, PAX5 no cromossoma 9 e ETV6 no cromossoma 12, estavam deleccionados como resultado do rearranjo cromossómico. Dado que o factor de transcrição PAX5 regula negativamente a expressão do gene FLT3, que desempenha uma função pró-proliferativa, é expectável que a haplo-insuficiência de PAX5 no caso com dic(9;12) terá tido como consequência uma elevação dos níveis de expressão de FLT3, contribuindo deste modo para uma proliferação celular aumentada. A t(X;20;16) foi identificada num doente com trombocitémia essencial (TE), uma doença que está intimamente relacionada com alterações de vias intracelulares reguladas por citocinas. Neste caso, através da utilização de um array genómico, identificámos a presença de pequenas delecções associadas com os pontos de quebra nos cromossomas 16 e 20. No cromossoma 16 apenas um gene, MAF, estava deleccionado, enquanto no cromossoma 20 a delecção tinha abrangido 3 genes. Dos genes deleccionados, dois deles, NFATC2 (20q13) e MAF (16q23), codificam proteínas que operam como reguladores transcricionais de citocinas hematopoiéticas. Dado que NFATC2 se localiza numa região que constitui um alvo frequente de delecções em neoplasmas ieloproliferativos, incluindo a trombocitémia essencial,efectuámos um estudo detalhado do papel deste gene na proliferação megacariocítica e na regulação da expressão de uma citocina hematopoiética (GM-CSF), implicada na maturação das diferentes linhagens mielóides. Utilizando um modelo de linha celular de trombocitémia essencial, verificámos que a supressão do transcrito do gene NFATC2 in vitro, por interferência de RNA, estava associada com um aumento da proliferação celular. Em concordância, o bloqueio da activação da proteína NFATC2 através de um inibidor específico da sua interacção com a calcineurina, conduziu a um aumento da proliferação celular in vitro. Utilizando a PCR quantitativa em tempo real, detectou-se um aumento da produção do RNA de GM-CSF em ambos os ensaios celulares, indicando que o factor de transcrição NFATC2 pode regular negativamente a expressão de GM-CSF em células de trombocitémia essencial. No geral, estes resultados mostram que a redução dos níveis fisiológicos do transcrito NFATC2, ou a redução da respectiva actividade proteica, estão relacionados com a proliferação de megacariocitos através do aumento da produção de GM-CSF. De acordo com estes resultados, verificámos que as células dos doentes com TE apresentam níveis mais baixos do transcrito NFATC2 do que a população normal. Dado que o factor de transcrição MAF desempenha igualmente um papel como regular transcricional de citocinas, é plausível que a haplo-insuficiência dos genes NFATC2 e MAF, resultante do rearranjo cromossómico complexo t(X;20;16), teve um efeito cooperativo importante na patogénese da trombocitémia essencial através da alteração do padrão normal de expressão das citocinas hematopoiéticas. Em síntese, efectuámos nesta dissertação um estudo citogenético de 4 translocações cromossómicas complexas incluindo t(12;21;5), t(12;6;15), t(9;11;19) e t(X;20;16), e de uma translocação dicêntrica dic(9;12), associadas com diferentes neoplasmas hematológicos. Em casos seleccionados efectuámos também um estudo molecular detalhado das regiões dos pontos de quebra. Esta análise permitiu-nos identificar 2 genes, CCDC94 no cromossoma 19 e NFATC2 no cromossoma 20, cuja haplo-insuficiência pode promover o aumento da proliferação celular das células leucémicas. A partir destes estudos podem ser retiradas 2 noções principais: (i) Os pontos de quebra adicionais, que ocorrem em translocações complexas associadas com a formação de genes de fusão, podem ter como consequência a desregulação de genes controladores da proliferação celular (e.g., CCDC94); (ii) As translocações complexas caracterizadas pela ausência de genes de fusão recorrentes poderão estar preferencialmente associadas com a presença de delecções, envolvendo um ou mais genes, nos pontos de quebra; nestas situações, serão necessários pelo menos 2 genes com funções celulares semelhantes (e.g., NFATC2 e MAF) ou complementares (e.g., ETV6 e CDKN1B) para, quando deleccionados, promoverem de forma cooperativa a leucemogénese. Nestes termos, o modelo de alterações genéticas sequenciais que caracteriza o desenvolvimento do cancro pode ser substituído por um modelo em que vários genes-alvo são simultaneamente desregulados pela formação de uma translocação cromossómica complexa, evitando deste modo a necessidade de ocorrência de alterações genéticas subsequentes.----------------------ABSTRACT: Tumourigenesis is a multistep process which results from the accumulation of successive genetic mutations in a normal cell. In leukemia for instance, recurrent translocations play a part in this process by generating fusion genes which lead to the production of hybrid proteins with an oncogenic role. However, a minor subset of chromosomal translocations referred to as complex or variant involves extra breakpoints at variable genome locations in addition to those implicated in the formation of fusion genes. We aimed to describe in this work the role, if any, of genes located at extra breakpoint locations or which are affected by breakpoint-adjacent deletions through the study of 5 leukemia patients.Two of the patients presented with TV6(12p13)-RUNX1(21q22) and MLL(11q23)- MLLT3(9p22) fusion genes as a result of a t(12;21;5) and a t(9;11;19), respectively. Detailed molecular characterization of the extra breakpoint at chromosome 19 in the latter case revealed that a novel ubiquitously expressed gene, CCDC94, with a potential role in cell cycle regulation, was disrupted by the breakpoint. We demonstrated using in vitro cellular assays that this gene codifies for a nuclear protein which negatively regulates cell cycle progression. These data shows that extra breakpoint locations of complex translocations may result in haplo-insufficiency of critical proliferation genes, thereby cooperating with the generation of hybrid proteins to provide unrestrained cell proliferation. In the other 3 patients there were reakpoint-associated deletions which precluded the formation of putative fusion genes. In a case with a t(12;6;15) we characterized a deletion at 12p13 which eliminated ETV6 and 8 other genes including CDKN1B. These findings indicate that concomitant loss of ETV6 and CDKN1B, which encodes a cyclin-dependent kinase inhibitor responsible for blocking entry of cells into the G1 phase of the cell cycle, acted cooperatively to promote leukemogenic proliferation. The same notion applied to a case with a dic(9;12) in which 2 genes encoding hematopoietic transcription factors - ETV6 and PAX5 (9p13)- were deleted as a result of breakpoint-adjacent deletions. Similarly, we found that 2 transcription factor genes involved in the regulation of cytokine expression, NFATC2 (20q13) and MAF (16q23), were involved in deletions contiguous to the breakpoints in a patient with a t(X;20;16). In vitro suppression of NFATC2 mRNA or inhibiton of NFATC2 protein activity enhanced cell proliferation as a result of an increase in the production of a myeloid-lineage stimulating hematopoietic cytokine, GM-CSF. These results suggest that haplo-insufficiency of NFATC2 and MAF genes had a cooperative effect in inducing cell proliferation as a result of a disregulation of cytokine production. Two main conclusions may be drawn from our studies: (i) In complex translocations associated with the production of fusion genes, additional breakpoints may cooperate in tumourigenesis by targeting genes that control cell proliferation; (ii) In complex translocations associated with small breakpoint-adjacent deletions, at least 2 genes with similar or complementary functions need to be deregulated to promote tumourigenesis.

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INTRODUCTION: A growing body of evidence shows the prognostic value of oxygen uptake efficiency slope (OUES), a cardiopulmonary exercise test (CPET) parameter derived from the logarithmic relationship between O(2) consumption (VO(2)) and minute ventilation (VE) in patients with chronic heart failure (CHF). OBJECTIVE: To evaluate the prognostic value of a new CPET parameter - peak oxygen uptake efficiency (POUE) - and to compare it with OUES in patients with CHF. METHODS: We prospectively studied 206 consecutive patients with stable CHF due to dilated cardiomyopathy - 153 male, aged 53.3±13.0 years, 35.4% of ischemic etiology, left ventricular ejection fraction 27.7±8.0%, 81.1% in sinus rhythm, 97.1% receiving ACE-Is or ARBs, 78.2% beta-blockers and 60.2% spironolactone - who performed a first maximal symptom-limited treadmill CPET, using the modified Bruce protocol. In 33% of patients an cardioverter-defibrillator (ICD) or cardiac resynchronization therapy device (CRT-D) was implanted during follow-up. Peak VO(2), percentage of predicted peak VO(2), VE/VCO(2) slope, OUES and POUE were analyzed. OUES was calculated using the formula VO(2) (l/min) = OUES (log(10)VE) + b. POUE was calculated as pVO(2) (l/min) / log(10)peakVE (l/min). Correlation coefficients between the studied parameters were obtained. The prognosis of each variable adjusted for age was evaluated through Cox proportional hazard models and R2 percent (R2%) and V index (V6) were used as measures of the predictive accuracy of events of each of these variables. Receiver operating characteristic (ROC) curves from logistic regression models were used to determine the cut-offs for OUES and POUE. RESULTS: pVO(2): 20.5±5.9; percentage of predicted peak VO(2): 68.6±18.2; VE/VCO(2) slope: 30.6±8.3; OUES: 1.85±0.61; POUE: 0.88±0.27. During a mean follow-up of 33.1±14.8 months, 45 (21.8%) patients died, 10 (4.9%) underwent urgent heart transplantation and in three patients (1.5%) a left ventricular assist device was implanted. All variables proved to be independent predictors of this combined event; however, VE/VCO2 slope was most strongly associated with events (HR 11.14). In this population, POUE was associated with a higher risk of events than OUES (HR 9.61 vs. 7.01), and was also a better predictor of events (R2: 28.91 vs. 22.37). CONCLUSION: POUE was more strongly associated with death, urgent heart transplantation and implantation of a left ventricular assist device and proved to be a better predictor of events than OUES. These results suggest that this new parameter can increase the prognostic value of CPET in patients with CHF.

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We study the peculiar dynamical features of a fractional derivative of complex-order network. The network is composed of two unidirectional rings of cells, coupled through a "buffer" cell. The network has a Z3 × Z5 cyclic symmetry group. The complex derivative Dα±jβ, with α, β ∈ R+ is a generalization of the concept of integer order derivative, where α = 1, β = 0. Each cell is modeled by the Chen oscillator. Numerical simulations of the coupled cell system associated with the network expose patterns such as equilibria, periodic orbits, relaxation oscillations, quasiperiodic motion, and chaos, in one or in two rings of cells. In addition, fixing β = 0.8, we perceive differences in the qualitative behavior of the system, as the parameter c ∈ [13, 24] of the Chen oscillator and/or the real part of the fractional derivative, α ∈ {0.5, 0.6, 0.7, 0.8, 0.9, 1.0}, are varied. Some patterns produced by the coupled system are constrained by the network architecture, but other features are only understood in the light of the internal dynamics of each cell, in this case, the Chen oscillator. What is more important, architecture and/or internal dynamics?

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We examined the longitudinal changes of VEGF levels after percutaneous coronary intervention for predicting major adverse cardiac events (MACE) in coronary artery disease (CAD) patients. VEGF was measured in 94 CAD patients' serum before revascularization, 1-month and 1-year after. Independently of clinical presentation, patients had lower VEGF concentration than a cohort of healthy subjects (median, IQ: 15.9, 9.0-264 pg/mL versus 419, 212-758 pg/mL; P < 0.001) at baseline. VEGF increased to 1-month (median, IQ: 276, 167-498 pg/mL; P < 0.001) and remained steady to 1-year (median, IQ: 320, 173-497 pg/mL; P < 0.001) approaching control levels. Drug eluting stent apposition and previous medication intake produced a less steep VEGF evolution after intervention (P < 0.05). Baseline VEGF concentration <40.8 pg/mL conveyed increased risk for MACE in a 5-year follow-up. Results reflect a positive role of VEGF in recovery and support its importance in CAD prognosis.

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Dissertation submitted in partial fulfillment of the requirements for the Degree of Master of Science in Geospatial Technologies.

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A Work Project, presented as part of the requirements for the Award of a Masters Degree in Finance from the NOVA – School of Business and Economics