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6-Nitrodopamine is a novel catecholamine released by vascular tissues, heart, and vas deferens. The aim of this study was to investigate whether 6-nitrodopamine is released from the thoracic aorta and pulmonary artery rings of marmosets (Callithrix spp.) and to evaluate the relaxing and anti-contractile actions of this catecholamine. Release of 6-nitrodopamine, dopamine, noradrenaline, and adrenaline was assessed by liquid chromatography with tandem mass spectrometry (LC-MS/MS). The relaxations induced by 6-nitrodopamine and by the selective dopamine D2 receptor antagonist L-741,626 were evaluated on U-46619 (3 nM)-pre-contracted vessels. The effects of 6-nitrodopamine and L-741,626 on the contractions induced by electric-field stimulation (EFS), dopamine, noradrenaline, and adrenaline were also investigated. Both aorta and pulmonary artery rings exhibited endothelium-dependent release of 6-nitrodopamine, which was significantly reduced by the NO synthesis inhibitor L-NAME. Addition of 6-nitrodopamine or L-741,626 caused concentration-dependent relaxations of both vascular tissues, which were almost abolished by endothelium removal, whereas L-NAME and the soluble guanylate cyclase inhibitor ODQ had no effect on 6-nitrodopamine-induced relaxations. Additionally, pre-incubation with 6-nitrodopamine antagonized the dopamine-induced contractions, without affecting the noradrenaline- and adrenaline-induced contractions. Pre-incubation with L-741,626 antagonized the contractions induced by all catecholamines. The EFS-induced contractions were significantly increased by L-NAME, but unaffected by ODQ. Immunohistochemical assays showed no immunostaining of the neural tissue markers S-100 and calretinin in either vascular tissue. The results indicated that 6-nitrodopamine is the major catecholamine released by marmoset vascular tissues, and it acts as a potent and selective antagonist of dopamine D2-like receptors. 6-nitrodopamine release may be the major mechanism by which NO causes vasodilatation.

https://doi.org/10.1590/1414-431x2023e12622

High prevalence of hepatitis A and E viruses in environmental and clinical samples from West Argentina
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Castro, Ivana Lo

; Espul, Carlos

; Paula, Vanessa Salete de

; Altabert, Nancy R.

; Gonzalez, Jorge E.

; Lago, Barbara Vieira

; Villar, Livia Melo

Brazilian Journal of Infectious Diseases

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2023, Volume 27 Nº 2 elocation 102738

Resumo: En | Texto: En | PDF: En

ABSTRACT Environmental surveillance of water sources is important to monitoring viral hepatitis transmission in clinical settings. This study investigated the circulation of hepatitis A (HAV) and E (HEV) viruses in sewage and clinical samples from Argentina. Between 2016 and 2017, 80 raw sewage samples and 86 clinical samples (stool and serum) from suspected cases of hepatitis A and hepatitis E were obtained. HAV and HEV were tested by both real-time and nested PCR. Positive samples were sequenced for genotype determination and phylogenetic analysis. Overall, HAV was recovered in 39% of sewage samples and 61.1% of clinical samples. HEV was detected in 22.5% of sewage samples and 15.9% of clinical samples. HAV was found more frequently in sewage during the winter and in clinical samples in spring; HEV was more prevalent in sewage during summer and in clinical samples in autumn. All HAV isolates belonged to genotype IA and HEV isolates belonged to genotype 3, the most prevalent genotypes in South America. High prevalence of HAV and HEV in environmental and clinical samples in Mendoza, Argentina was observed. These findings reinforce the importance of environmental surveillance and implementation of health strategies to control the spread of HAV and HEV in developing countries.

https://doi.org/10.1016/j.bjid.2022.102738

Quadrastichus mendeli (Hymenoptera: Eulophidae): parasitism on Leptocybe invasa (Hymenoptera: Eulophidae) and first record in Brazil
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Puretz, B. O.

; Gonzalez, C. J.

; Mota, T. A.

; Dallacort, S.

; Carvalho, V. R.

; Silva, R. M. L.

; Serrão, J. E.

; Zanuncio, J. C.

; Wilcken, C. F.

Brazilian Journal of Biology

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2022, Volume 82 elocation e264771

Resumo: En | Texto: En | PDF: En

https://doi.org/10.1590/1519-6984.264771

Antiproliferative, genotoxic and mutagenic potential of synthetic chocolate food flavoring
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Frâncica, L. S.

; Gonçalves, E. V.

; Santos, A. A.

; Vicente, Y. S.

; Silva, T. S.

; Gonzalez, R. S.

; Almeida, P. M.

; Feitoza, L. L.

; Bueno, P. A. A.

; Souza, D. C.

; Peron, A. P.

Brazilian Journal of Biology

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2022, Volume 82 elocation e243628

Resumo: Pt En | Texto: Pt En | PDF: Pt | PDF: En

Resumo Os aditivos aromatizantes têm grande importância tecnológica para a indústria de alimentos. Contudo, poucas são as informações quanto as propriedades toxicológicas desses microingredientes, especialmente, em nível celular. No presente estudo avaliou-se, sobre as células meristemáticas de raízes de Allium cepa L., a toxicidade de um aditivo sintético líquido de aroma e sabor de chocolate, fabricado e amplamente comercializado em todo Brasil, e exportado para outros países da América do Sul. As concentrações de aromatizante avaliadas foram 100,00; 50,00; 25,00; 1,00; 0,50 e 0,25 µL/L, onde a maior concentração estabelecida foi cem vezes menor que a sugerida comercialmente para uso. Com base na interpretação dos resultados, a concentração 100 µL/L reduziu substancialmente a divisão celular dos meristemas nas 24 e 48 horas de exposição. As concentrações 100,00 a 0,50 µL/L demonstraram número significativo de prófases em detrimento as outras fases da divisão celular, indicando ação aneugênica, e induziram número significativo de alterações celulares, com ênfase a micronúcleos, broto nucleares e quebras cromossômicas. Nas condições de análises estabelecidas, com exceção a concentração 0,25 µL/L, o aromatizante de chocolate causou citotoxicidade, genotoxicidade e mutagenicidade aos meristemas radiculares.

Abstract Flavoring additives are of great technological importance for the food industry. However, there is little information regarding the toxicological properties of these micro-ingredients, especially at the cellular level. The present study used meristematic root cells of Allium cepa L. to evaluate the toxicity of a liquid, aroma and flavor synthetic chocolate additive, manufactured and widely marketed throughout Brazil and exported to other countries in South America. The flavoring concentrations evaluated were 100.00; 50.00; 25.00; 1.00; 0.50 and 0.25 µL/L, where the highest concentration established was one-hundred times lower than that commercially suggested for use. The concentration 100 µL/L substantially reduced cell division of meristems within 24- and 48-hours exposure. Concentrations from 100.00 to 0.50 µL/L resulted in a significant number of prophases to the detriment of the other phases of cell division, indicating an aneugenic activity, and induced a significant number of cellular changes, with emphasis on micronuclei, nuclear buds and chromosomal breaks. Under the established analysis conditions, with the exception of concentration 0.25 µL/L, the flavoring of chocolate caused cytotoxicity, genotoxicity and mutagenicity to root meristems.

https://doi.org/10.1590/1519-6984.243628 256 downloads

Clinical characteristics and evolution of hematological patients and COVID-19 in Argentina: a report from the Argentine Society of Hematology
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Basquiera, Ana L.

; García, Mercedes J

; Martinez Rolón, Juliana

; Olmedo, Julieta

; Laviano, Julia

; Burgos, Rubén

; Caeiro, Gastón

; Remaggi, Guillermina

; Raña, Pablo

; Paoletti, Mariano

; González, Carlos M.

; Fernández, Isolda

; Pavlovsky, Astrid

; Perusini, Maria A.

; Rodriguez, Andrea

; Guanchiale, Luciana

; Carvani, Analia

; Mandrile, Laura

; Figueroa, Flavia

; Vicente Reparaz, Ángeles

; Fragapane Mathus, Patricia N.

; Garate, Gonzalo

; Fauque, María E.

; Kantor, Gustavo

; Cruset, Soledad

; Gonzalez Lorch, Jacqueline S.

; Szelagowski, Milagros

; Giarini, María P.

; Oliveira, Natalia

; García, María C.

; Ventriglia, María V.

; Pereyra, Patricio H.

; Gutierrez, Daniel R.

; Kusminsky, Gustavo

; Troccoli, Josefina

; Freitas, María J.

; Cranco, Santiago

; Del V.Sanchez, Natalia

; Rey, Irene

; Funes, María E.

; Jarchum, Sol

; Freue, Julian

; Miroli, Augusto

; Guerrero, Osvaldo

; López Ares, Lisa

; Campestri, Reinaldo

; Bove, Victor

; Salinas, Graciela N.

; Cabrejo, María

; Milone, Jorge H.

; Zabaljauregui, Soledad

; Gotta, Daniel

; Dupont, Juan Carlos

; Stemmelin, German

Medicina (Buenos Aires)

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Ago 2021, Volume 81 Nº 4 Páginas 536 - 545

Resumo: En Es | Texto: En Es | PDF: En | PDF: Es

Abstract Individuals with malignancies and COVID-19 have a lower survival compared with the general population. However, the information about the impact of COVID-19 on the whole hematological population is scarce. We aimed to describe the 30th day overall survival (OS) after COVID-19 infection in pa tients with a hematological disease in Argentina. A completely anonymous survey from the Argentine Society of Hematology was delivered to all the hematologists in Argentina; it started in April 2020. A cut-off to analyze the data was performed in December 2020 and, finally, 419 patients were reported and suitable for the analysis (average age: 58 years, 90% with malignant diseases). After the COVID-19 diagnosis, the 30-day OS for the whole population was 80.2%. From the entire group (419), 101 (24.1%) individuals required intensive care unit admission, where the 30-day OS was 46.6%. Among allogeneic stem cell transplant recipients, the 30-day OS was 70.3%. Factors associated with a low OS were two or more comorbidities, an active hematological disease and history of chemotherapy. In individuals with the three factors, the 30-day OS was 49.6% while the 30-day OS in those without those factors was 100%. Patients with hematological diseases have a higher mortality than the general population. This group represents a challenge and requires careful decision-making of the treatment in order not to compromise the chances of cure.

Resumen El presente estudio tuvo por objetivo primario conocer la mortalidad de pacientes con enfermedad hematológica que presentaron infección por COVID-19 en Argentina. Para ello se difundió una encuesta desde la Sociedad Argentina de Hematología (SAH) entre los hematológos para informar sobre los pacientes con enfermedades hematológicas y diagnóstico de infección por SARS- CoV-2, entre el 19/4/2020, y el 7/12/2020. Se incluyeron individuos de todas las edades con diagnóstico de enfermedad hematológica benigna o maligna e infección por SARS-CoV-2 confirmada por técnica de RT-PCR. Se analizaron 419 pacientes (mediana 58 años; 90% enfermedades malignas). La supervivencia al día 30 fue de 80.2%. La supervivencia fue menor en aquellos que requirieron internación (74.2%), cuidados intensivos (46.6%) y asistencia respiratoria mecánica (36.8%). Entre los trasplantados alogénicos la supervivencia fue 70.3%. Los factores vinculados a la supervivencia global fueron las comorbilidades, el estado de la enfermedad al momento de la infección y el antecedente de quimioterapia. Se pudo establecer un score en el que aquellos que tuvieron un puntaje de 4 alcanzaron una supervivencia del 49.6% al día 30, mientras que la de los pacientes con score 0 fue del 100% a 30 días. En comparación con la población general, los pacientes con enfermedades hematológicas presentan una mayor mortalidad vinculada al COVID-19, motivo por el cual es primordial definir pautas destinadas a disminuir la exposición de los mismos sin comprometer las posibilidades de beneficiarse del tratamiento de la enfermedad de base.

121 downloads

Structural correlations in Cs2CuCl4: Pressure dependence of electronicstructures
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Jara, E.

; Barreda-Argueso, J. A.

; Gonzalez, J.

; Valiente, R.

; Rodrguez, F.

Papers in physics

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Jun 2019, Volume 11 Nº 1 Páginas 1 - 4

Resumo: En | Texto: En | PDF: En

We have investigated the crystal structure of Cs2CuCl4 in the 0-20 GPa range as a function of pressure and how pressure affects its electronic properties by means of optical absorption spectroscopy. In particular, we focused on the electronic properties in the low-pressure Pnma phase, which are mainly related to the tetrahedral CuClp units distorted by the Jahn-Teller effect. This study provides a complete characterization of the electronic structure of Cs2CuCl4 in the Pmna phase as a function of the cell volume and the Cu-Cl bond length, Rc-u-ci. Interestingly, the opposite shift of the charge-transfer band-gap and the Cu1 4+ d-d crystal-field band shift with pressure are responsible for the strong piezochromism of Cs2CuCl4. We have also explored the high-pressure structure of Cs2CuCl4 above 4.9 GPa yielding structural transformations that are probably associated with a change of coordination around Cu2+. Since the high-pressure phase appears largely amorphized, any structural information from X-ray diffraction is ruled out. We use electronic probes to get structural information of the high-pressure phase.

120 downloads

Long-term visual and anatomic outcomes after photodynamic therapy for symptomatic circumscribed choroidal hemangioma
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Gonzalez-Cortes, Jesus H.

; Olvera-Barrios, Abraham

; Perez-Salas, Jose R.

; Trevino-Rodríguez, Hugo A.

; Trevino-Cavazos, Ezequiel E.

; Gonzalez-Cantu, Jesus E.

; Mohamed-Hamsho, Jesus

Cirugía y cirujanos

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Abr 2019, Volume 87 Nº 2 Páginas 224 - 229

Resumo: En Es | Texto: En Es | PDF: En | PDF: Es

Abstract Circumscribed choroidal hemangiomas (CCHs) are relatively rare. We report the response of a symptomatic CCH to photodynamic therapy (PDT). A 70-year-old male presented with blurred vision of the left eye (OS). Best-corrected visual acuity (BCVA) was 20/60 right eye and 20/160 OS. Biomicroscopy revealed bilateral cataracts. Diagnosis of CCH was made fundoscopically for OS and confirmed with optical coherence tomography (OCT). One session of PDT with individualized parameters was administered. After 2 months, anatomical improvement was evidenced with OCT and BCVA was 20/60. After cataract surgery, his BCVA was of 20/25 and remained stable. PDT showed excellent anatomic and visual results after a 2-year follow-up.

Resumen Los hemangiomas coroideos circunscritos son relativamente raros. Reportamos la respuesta de uno sintomático con terapia fotodinámica. Un hombre de 70 años presentó visión borrosa en el ojo izquierdo. La mejor agudeza visual corregida fue de 20/60 en el ojo derecho y de 20/160 en el izquierdo. La biomicroscopía demostró catarata en ambos ojos. En el ojo izquierdo se diagnosticó un hemangioma coroideo circunscrito confirmado con tomografía de coherencia óptica. Se administró una sesión de terapia fotodinámica con parámetros individualizados. Dos meses después se observó mejoría anatómica en la tomografía de coherencia óptica, y la mejor agudeza visual corregida fue de 20/60. Después de la cirugía de catarata, la mejor agudeza visual corregida fue de 20/25 y tuvo estabilidad. La terapia fotodinámica mostró excelentes resultados anatómicos y funcionales a los 2 años.

https://doi.org/10.24875/ciru.18000362 6 downloads

How are HCV-infected patients being identified in Brazil: a multicenter study
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Portari-Filho, Luiz H.

; Álvares-da-Silva, Mario R.

; Gonzalez, Aline

; Ferreira, Adalgisa P.

; Nogueira, Cristiane V.

; Mendes-Correa, Maria C.

; Lima, José M.

; Lopes, Edmundo P.

; Brandão, Carlos E.

; Ivantes, Cláudia

; Lyra, André

; Lindenberg, Andreia

; Ferraz, Maria L.

Brazilian Journal of Infectious Diseases

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Jan 2019, Volume 23 Nº 1 Páginas 34 - 39

Resumo: En | Texto: En | PDF: En

ABSTRACT Background: Hepatitis C is an important health problem. In Brazil, 1-2 million people are infected. Despite this expressive number, and the availability of very successful treatment, many patients remained undiagnosed mainly because of the asymptomatic nature of the infection. Objectives: To describe epidemiological characteristics of HCV-infected patients seen at referral centers in Brazil, the source of referral, and the time spanned to reach a reference center, in order to improve the identification of undiagnosed patients. Methods: Multicenter observational, cross-sectional study carried out in 15 centers of Brazil, between January/2016 and June/2017. Data of patients with a confirmed diagnosis (anti-HCV and HCV-RNA) were collected by interview using standard questionnaires and by review of charts. Results: Two thousand patients were included; 55.1% were male, mean age 58 ± 11 years. Only 14.9% had higher education and 84.2% received up to five monthly minimum Brazilian wages (approximately US$260.00/month). The time between diagnosis and beginning of follow-up was 22.9 months. The most common reasons for testing were check-up (33.2%) and blood donation (19%). General practitioners diagnosed most of the patients (30.1%). Fibrosis stage was mainly evaluated by liver biopsy (61.5%) and 31.3% of the patients were cirrhotic at diagnosis. Conclusions: This multicenter Brazilian study showed that the mean time to reach a referral center for treatment was almost two years. Primary care physicians diagnoses most hepatitis C cases in the country. Population campaigns and medical education should be encouraged to intensify screening of asymptomatic individuals, considering the efficiency of check-ups in identifying new patients.

https://doi.org/10.1016/j.bjid.2019.01.006 533 downloads

Diversity of ichneumonoidea (Hymenoptera) in three types of land use in a multiple production agroecosystem in Xmatkuil, Yucatan, Mexico.
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Castillo-Sánchez, L. E.

; Jiménez-Osornio, J. J.

; Delfín-González, H.

; Ramírez Pech, J.

; Canul-Solís, J. R.

; Gonzalez-Moreno, A.

; Campos-Navarrete, M. J.

Revista bio ciencias

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2019, Volume 6 elocation e543

Resumo: En Es | Texto: En Es | PDF: En | PDF: Es

Abstract The presence of natural enemies can be influenced by many factors like the type of land use. These organisms are considered of great importance due to the pest control they perform without causing disturbance to the environment. In this study, the structure of the community of the Ichneumonoidea superfamily was analyzed, in three sites of an agroecosystem with different types of land use. Sampling was carried out in the period of July 2004 to June 2005. Twenty-four yellow traps and one Malaise trap were placed per site, in three fixed transects of 35 m in length. Traps remained open for two days per month. A total of 1052 individuals, 37 subfamilies, 107 genera and 306 morphospecies were recorded. For the Braconidae family, 553 individuals belonging to 21 subfamilies, 57 genera and 172 morphospecies were collected. For the Ichneumonidae family, 499 individuals belonging to 16 subfamilies, 50 genera and 134 morphospecies were collected. The family garden site presented a higher diversity for both families. Richness estimators point out that family garden and secondary vegetation presented a higher richness, abundance and diversity of parasitoid species; where the koinobiont habits are frequently present. According to these results, it can be hypothesized that a high diversity of plant species favors beneficial factors for parasitoid survival.

Resumen La presencia de enemigos naturales puede estar influenciada por muchos factores como el tipo de uso de suelo. Estos organismos son considerados de gran importancia debido al control de plagas que realizan sin causar trastorno al ambiente. En este estudio se analiza la estructura de la comunidad de la superfamilia Ichneumonoidea, en tres sitios de un agroecosistema con diferentes usos de suelo. El muestreo se realizó en el período julio 2004-junio 2005. Se colocaron 24 trampas amarillas y una trampa Malaise por sitio, en tres transectos fijos de 35 m de longitud. Las trampas permanecieron durante dos días por mes. Se registró un total de 1052 individuos, 37 subfamilias, 107 géneros y 306 morfoespecies. Para la familia Braconidae se colectaron 553 individuos pertenecientes a 21 subfamilias, 57 géneros y 172 morfoespecies. Para la familia Ichneumonidae se colectaron 499 individuos pertenecientes a 16 subfamilias, 50 géneros y 134 morfoespecies. El sitio de huerto familiar presentó mayor diversidad para ambas familias. Los estimadores de riqueza indican que el huerto familiar y la vegetación secundaria presentaron mayor riqueza, abundancia y diversidad de especies de parasitoides, donde frecuentemente presenta el modo de vida koinobionte. De acuerdo con estos resultados, se puede sugerir que una alta diversidad de especies vegetales propicia factores benéficos para la supervivencia de los parasitoides.

https://doi.org/10.15741/revbio.06.e543 391 downloads

10.

Acquiring skills in malignant hyperthermia crisis management: comparison of high-fidelity simulation versus computer-based case study
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Mejía, Vilma

; Gonzalez, Carlos

; Delfino, Alejandro E.

; Altermatt, Fernando R.

; Corvetto, Marcia A.

Revista Brasileira de Anestesiologia

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Jun 2018, Volume 68 Nº 3 Páginas 292 - 298

Resumo: Pt En | Texto: Pt En | PDF: Pt | PDF: En

Resumo Introdução: O objetivo primário deste estudo foi comparar o efeito da simulação de alta-fidelidade versus autoestudo baseado em resolução de casos no computador, a aquisição de habilidades sobre hipertermia maligna em residentes de anestesiologia do primeiro ano. Métodos: Após a aprovação do Comitê de Ética institucional, 31 residentes de anestesiologia do primeiro ano foram inscritos neste estudo prospectivo, randômico e encoberto. Os participantes foram randomizados para um ambiente de simulação de alta-fidelidade (SAF) ou um estudo de caso (EC) em computador sobre hipertermia maligna. Após a intervenção, o desempenho de todos os indivíduos foi avaliado através de um ambiente de simulação de alta-fidelidade utilizando uma rubrica de avaliação previamente validada. Além disso, uma pesquisa de satisfação e testes de conhecimento foram aplicados. Por fim, uma entrevista semiestruturada foi realizada para avaliar a autopercepção do processo de raciocínio e da tomada de decisão. Resultados: Vinte e oito residentes do primeiro ano concluíram o estudo com sucesso. Os escores dos residentes na aquisição de habilidades no manejo da hipertermia maligna foram globalmente maiores no Grupo SAF que no Grupo EC, mas a significância foi em quatro dos oito elementos da rubrica de desempenho: reconhecer os sinais e sintomas (p = 0,025), priorizaras ações iniciais do manejo (p = 0,003), reconhecer complicações (p = 0,025) e comunicação (p = 0,025). As médias dos escores nos questionários de conhecimento pré- e pós-teste melhoraram de 74% para 85% no Grupo SAF e diminuíram de 78% para 75% no Grupo EC (p = 0,032). Em relação à análise qualitativa, não houve diferença nos fatores que influenciaram o processo de raciocínio e de tomada de decisão dos alunos com ambas as estratégias de ensino. Conclusão: O treinamento baseado em simulação com um ambiente de alta-fidelidade de hipertermia maligna foi superior ao estudo de caso em computador, melhorou o conhecimento e as habilidades no manejo de crises de hipertermia maligna, com um nível de satisfação muito bom entre os residentes de anestesia.

Abstract Introduction: The primary purpose of this study was to compare the effect of high fidelity simulation versus a computer-based case solving self-study, in skills acquisition about malignant hyperthermia on first year anesthesiology residents. Methods: After institutional ethical committee approval, 31 first year anesthesiology residents were enrolled in this prospective randomized single-blinded study. Participants were randomized to either a High Fidelity Simulation Scenario or a computer-based Case Study about malignant hyperthermia. After the intervention, all subjects' performance in was assessed through a high fidelity simulation scenario using a previously validated assessment rubric. Additionally, knowledge tests and a satisfaction survey were applied. Finally, a semi-structured interview was done to assess self-perception of reasoning process and decision-making. Results: 28 first year residents finished successfully the study. Resident's management skill scores were globally higher in High Fidelity Simulation versus Case Study, however they were significant in 4 of the 8 performance rubric elements: recognize signs and symptoms (p = 0.025), prioritization of initial actions of management (p = 0.003), recognize complications (p = 0.025) and communication (p = 0.025). Average scores from pre- and post-test knowledge questionnaires improved from 74% to 85% in the High Fidelity Simulation group, and decreased from 78% to 75% in the Case Study group (p = 0.032). Regarding the qualitative analysis, there was no difference in factors influencing the student's process of reasoning and decision-making with both teaching strategies. Conclusion: Simulation-based training with a malignant hyperthermia high-fidelity scenario was superior to computer-based case study, improving knowledge and skills in malignant hyperthermia crisis management, with a very good satisfaction level in anesthesia residents.

https://doi.org/10.1016/j.bjane.2018.01.009 1179 downloads

11.

Practical Considerations of Real Life of Hepatocellular Carcinoma in a Tertiary Center of Brazil
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Carvalho, Sandra R. Almeida

; Ferraz, Maria L. Gomes

; Matos, Carla A. Loureiro

; Silva, Antônio E. Benedito

; Filho, Roberto J. Carvalho

; Perez, Rogério Renato

; Gonzalez, Adriano Miziara

; Salzedas-Netto, Alcides A.

; Szejnfeld, Denis

; D’Ippolito, Giuseppe

; Lanzoni, Valéria Pereira

; Silva, Ivonete S. Souza

Annals of Hepatology

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Abr 2017, Volume 16 Nº 2 Páginas 255 - 262

Resumo: En | Texto: En | PDF: En

ABSTRACT Background. Hepatocellular carcinoma (HCC) is the most common malignancy that develops in cirrhotic livers. Its clinical and epidemiological characteristics and mortality rates vary according to geographical region. The objective of this study was to evaluate the clinical profile, epidemiological characteristics, laboratory parameters, treatment and survival of patients with HCC. Material and methods. Patients with HCC seen between 2000 and 2012 were studied. The Kaplan-Meier method was used for survival analysis according to variables in question. Results. The study included 247 patients with a mean age of 60 ± 10 years. There was a predominance of males (74%). The main etiologies of HCC were HCV infection (55%), excessive alcohol consumption (12%), and HBV infection (8%). Liver cirrhosis was present in 92% of cases. The mean tumor number and diameter were 2 and 5 cm, respectively. Patients meeting the Milan criteria corresponded to 43% of the sample. Liver transplantation was performed in 22.4% of patients of the Milan subset and in 10% of the whole sample. The overall mean survival was 60 months, with a 1-, 3- and 5-year survival probability of 74%, 40% and 29%, respectively. Lower survival was observed among patients with alcoholic etiology. Survival was higher among patients submitted to liver transplantation (P < 0.001), TACE (P < 0.001), or any kind of treatment (P < 0.001). However, no difference was found for surgical resection (P = 0.1) or sorafenib (P = 0.1). Conclusion. Patients with HCC were mainly older men diagnosed at an advanced stage. Treatment was associated with better overall survival, but few patients survived to be treated.

https://doi.org/10.5604/16652681.1231584 596 downloads

12.

CARACTERÍSTICAS ESTRUCTURALES Y FISIOLÓGICAS DE Petunia axillaris RELACIONADAS CON SU BAJA SENSIBILIDAD A GLIFOSATO
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DELLAFERRERA, I.

; PANIGO, E.

; GONZALEZ-TORRALBA, F.

; PRADO, R. DE

; CHRISTOFFOLETI, P.

; PERRETA, M.

Planta Daninha

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Set 2015, Volume 33 Nº 3 Páginas 451 - 462

Resumo: En Es | Texto: En Es | PDF: En | PDF: Es

ABSTRACTRepeated use of glyphosate as herbicide in the same site, among other things, increases the frequency of individuals with low sensitivity. Petunia axillaris is among the many reported cases of weed species that have presented problems for proper management. This study evaluates their sensitivity and discusses the possible mechanisms involved in its differential sensitivity. For this purpose, we analyzed the retention, absorption and translocation of radiolabeled herbicide, and the morphological characteristics related to the herbicide response. Studies confirms that Petunia axillaris is a glyphosate tolerant specie and the shikimic acid metabolic pathway is not altered. The low sensitivity to glyphosate in Petunia axillaris could be associated to low foliar retention and increased time of absorption, which delayed the entrance and movement of the herbicide. Regardless the altered structure with glyphosate, seed production is high enough which ensures the perpetuation of the less sensitive genotypes. Petunia axillaris showed a combination of morphological, structural, and physiological characteristics that determined their adaptive advantage to perpetuate and increase its population in systems with intensive use of glyphosate.

RESUMENLa utilización repetida de glifosato como herbicida, entre otros aspectos, aumenta la frecuencia de individuos con baja sensibilidad al mismo. Entre los numerosos casos reportados de especies de malezas que han presentado algún inconveniente para su adecuado manejo se encuentra Petunia axillaris. En este trabajo se evalúa su sensibilidad y se estudian posibles mecanismos involucrados. Se analizó la retención, absorción y translocación con herbicida radiomarcado, así como también la modificación estructural producida por la aplicación del herbicida. Los análisis comprueban que Petunia axillaris es una especie tolerante a glifosato, no mostrando inhibición de la ruta metabólica del ácido shikímico. La menor sensibilidad al herbicida podría estar relacionada con una menor retención foliar de glifosato y un mayor tiempo de absorción; lo cual retarda el ingreso y movimiento del herbicida. Desde el punto de vista estructural se afecta el desarrollo del eje principal, mateniendo sin embargo una elevada producción de flores y semillas. Petunia axillaris muestra una combinación de características morfológicas-estructurales y fisiológicas que determinan su ventaja adaptativa para permanecer y aumentar su población en sistemas con uso intensivo de glifosato.

https://doi.org/10.1590/S0100-83582015000300008 4088 downloads

13.

CO and ethanol electro-oxidation on Pt-Rh/C
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Calderón-Cárdenas, Alfredo

; Ortiz-Restrepo, John E.

; Mancilla-Valencia, Nelson D.

; Torres-Rodriguez, Gerardo A.

; Lima, Fabio H. B.

; Bolaños-Rivera, Alberto

; Gonzalez, Ernesto R.

; Lizcano-Valbuena, William H.

Journal of the Brazilian Chemical Society

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Ago 2014, Volume 25 Nº 8 Páginas 1391 - 1398

Resumo: Pt En | Texto: Pt En | PDF: Pt | PDF: En

Neste trabalho foi estudado o efeito da composição e tratamento térmico em H2, de materiais de Pt-Rh/C com proporções atómicas Pt:Rh de 3:1, 1:1 e 1:3 e 40% em massa de metal com relação a carbono, para a oxidação de COads e a oxidação de etanol. Os catalisadores foram preparados utilizando redução química com ácido fórmico e caracterizados fisicamente pelas técnicas de energia dispersiva de raios-X (EDX), retroespalhamento de elétron (EBS) e microscopia eletrônica de transmissão (TEM), mostrando relações Pt:Rh muito próxima às previstas, tamanhos de partícula médios similares e uma apropriada distribuição do metal sobre o suporte de carbono na micro e nano escala. Experimentos de voltametria cíclica mostraram um enriquecimento da superfície em Pt, devido à instabilidade termodinámica do sistema na temperatura experimental. A normalização das correntes foi feitas utilizando a carga de dessorção oxidativa de CO permitindo observar as diferenças entre os níveis atuais gerados exclusivamente pelos efeitos eletrônicos do Rh na Pt. O tratamento térmico dos catalisadores de Pt-Rh em uma atmosfera de H2, mostrou grande estabilidade dos materiais e também um notório incremento nos níveis de corrente para as reações de eletro-oxidação de CO e etanol. Isto sugere a necessidade de melhor explorar os efeitos dos tratamentos térmicos na eletrocatálise da reação de oxidação do etanol.

In this work we studied the effect of the composition and thermal treatment in H2 of Pt-Rh/C materials with atomic ratios close to Pt:Rh 3:1, 1:1 and 1:3 and metal loading of 40 wt. %, for the COads and ethanol oxidation. Catalysts were prepared by chemical reduction with formic acid and physically characterized by energy dispersive X-rays spectroscopy (EDX), electron backscattering (EBS) and transmission electron microscopy (TEM), showing Pt:Rh ratios close to the nominals values, similar average particle sizes and an appropriated distributions of metal on carbon support at micro and nano scale. Cyclic voltammetry experiments showed a surface enriched in Pt due to the termodinamically unstable Pt-Rh system at the experimental temperature. The currents were normalized using the charge of oxidative desorption of CO allowing to observe differences among the current levels generated exclusively by the Rh electronic effects on the Pt. The thermal treatments of the Pt-Rh catalysts in a hydrogen atmosphere showed greater stability of the materials and notorious increases of the current levels for CO and ethanol electro-oxidation reactions. This suggests the necessity of better exploring the effects of thermal treatments in the electrocatalysis of the ethanol oxidation reaction.

https://doi.org/10.5935/0103-5053.20140121 1995 downloads

14.

Reporting detection of Chlamydia trachomatisDNA in tissues of neonatal death cases
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Trejo, Maria Hernandez

; Gonzalez, Norma E. Herrera

; Guerra, Marcos R. Escobedo

; Cruz, M. de Jesus de Haro

; Moreno-Verduzco, Elsa R.

; Lopez-Hurtado, Marcela

; Guerra-Infante, Fernando M.

Jornal de Pediatria

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Abr 2014, Volume 90 Nº 2 Páginas 182 - 189

Resumo: Pt En | Texto: Pt En | PDF: Pt | PDF: En

OBJETIVO: determinar se a C. trachomatis está presente em neonatos com infecção, porém sem patógeno isolado, que morreram durante a primeira semana de vida.MÉTODOS: casos de óbito neonatal precoce cujas causas de óbito haviam sido anteriormente determinadas pelo Comitê de Mortalidade da instituição foram aleatoriamente selecionados. Foram utilizadas as reações em cadeia da polimerase convencional e em tempo real do gene omp1 da C. trachomatis, para identificar, às cegas, a presença de DNA de clamídia nas amostras desparafinizadas de cinco órgãos (de autópsias autorizadas) de cada um dos neonatos mortos. Além disso, foram realizados diagnósticos diferenciais por amplificação de um fragmento do rRNA 16S de Mycoplasma ssp.RESULTADOS: em cinco casos (35,7%) a presença de DNA de C. trachomatis foi detectada em um ou mais órgãos. Havia infecção neonatal grave em três casos; um deles correspondente ao genótipo D de C. trachomatis. Curiosamente, outro caso preencheu os mesmos critérios, porém possuía uma reação em cadeia da polimerase positiva para Mycoplasma hominis, um patógeno conhecido por causar sepse em recém-nascidos.CONCLUSÃO: a utilização de técnicas de biologia molecular nos casos de mortalidade infantil precoce mostrou que a C. trachomatis poderia desempenhar um papel no desenvolvimento de infecção grave e no óbito neonatal precoce semelhante ao observado com a Mycoplasma hominis. São necessários estudos adicionais para determinar a patogênese dessa infecção perinatal.

OBJECTIVE:to determine whether C. trachomatis was present in neonates with infection, but without an isolated pathogen, who died during the first week of life.METHODS:early neonatal death cases whose causes of death had been previously adjudicated by the institutional mortality committee were randomly selected. End-point and real-time polymerase chain reaction of the C. trachomatis omp1 gene was used to blindly identify the presence of chlamydial DNA in the paraffinized samples of five organs (from authorized autopsies) of each of the dead neonates. Additionally, differential diagnoses were conducted by amplifying a fragment of the 16S rRNA of Mycoplasma spp.RESULTS:in five cases (35.7%), C. trachomatis DNA was found in one or more organs. Severe neonatal infection was present in three cases; one of them corresponded to genotype D of C. trachomatis. Interestingly, another case fulfilled the same criteria but had a positive polymerase chain reaction for Mycoplasma hominis, a pathogen known to produce sepsis in newborns.CONCLUSION:the use of molecular biology techniques in these cases of early infant mortality demonstrated that C. trachomatis could play a role in the development of severe infection and in early neonatal death, similarly to that observed with Mycoplasma hominis. Further study is required to determine the pathogenesis of this perinatal infection.

https://doi.org/10.1016/j.jped.2013.09.002 10467 downloads

15.

Cardiac resynchronization therapy: evaluation of ventricular dysynchrony and patient selection
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Baquero, Giselle

; Banchs, Javier E.

; Davidson, William R.

; Penny-Peterson, Erica D.

; Samii, Soraya M.

; Wolbrette, Deborah L.

; Naccarelli, Gerald V.

; Gonzalez, Mario D.

Archivos de cardiología de México

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Dez 2010, Volume 80 Nº 4 Páginas 289 - 300

Resumo: En Es | Texto: En Es | PDF: En | PDF: Es

Cardiac resynchronization therapy (CRT) is an established treatment modality for systolic heart failure. Aimed to produce simultaneous biventricular stimulation and correct the lack of ventricular synchrony in selected patients with congestive heart failure, CRT has shown to improve mortality and reduce hospital admissions when compared to medical treatment. At present, the indication criteria for the implantation of a CRT device include an ejection fraction of less than 35%, heart failure symptoms consistent with NYHA functional class III-IV and a QRS complex duration equal or longer than 120 milliseconds. It has been reported that 30% of patients who meet those criteria still may not derive clinical benefit from CRT. Due to the existing diversity of imaging modalities and resources for their process and analysis, a great expectation in terms of more accurate diagnosis of ventricular dyssynchrony has been raised. Reliable identification of dyssynchrony could allow us to better predict the favorable response of an individual patient to CRT and therefore offer this procedure to those individuals most likely to benefit. We review the available techniques for the study of ventricular dyssynchrony for CRT patient selection and the results of its application in clinical trials. Despite tremendous progress in the imaging technology available for the assessment and diagnosis of ventricular dyssynchrony, an ideal method has not been identified and the duration of the QRS complex in the surface ECG remains the accepted criteria of dyssynchrony in the selection of patients for CRT.

La terapia de resincronización cardiaca es una modalidad de tratamiento bien establecida para la insuficiencia sistólica cardiaca. Dirigida a producir una estimulación biventricular simultánea y a corregir la falta de sincronía ventricular en pacientes seleccionados con insuficiencia cardiaca congestiva, la terapia de resincronización cardiaca ha mostrado ser capaz de mejorar los índices de mortalidad y reducir las admisiones hospitalarias cuando se compara con el tratamiento médico. Actualmente, los criterios para la implantación de un dispositivo de terapia de resincronización cardiaca incluyen una fracción de eyección menor a 35%, síntomas de insuficiencia cardiaca consistentes con la clase funcional NYHA III-IV, y una duración del complejo QRS igual o mayor de 120 milisegundos. Se ha reportado que 30% de los pacientes que cumplen con estos criterios pueden inclusive no obtener beneficio clínico de la terapia de resincronización cardiaca. Debido a la diversidad existente de los estudios de imagenología y de los recursos para su proceso y análisis, ha surgido una gran expectativa en términos de un diagnóstico más exacto de la asincronía ventricular. La identificación confiable de la asincronía nos podría permitir predecir mejor la respuesta favorable de un paciente en particular a la terapia de resincronización cardiaca y así ofrecer este procedimiento a aquellos pacientes con mayores probabilidades de beneficiarse de dicha terapia. Hacemos una revisión de las técnicas disponibles para el estudio de la asincronía ventricular para la selección de pacientes para esta terapia y los resultados de su aplicación en pruebas clínicas. A pesar de los grandes progresos alcanzados en la tecnología de imágenes disponibles para la evaluación y diagnóstico de la asincronía ventricular, no se ha identificado un método ideal y la duración del complejo QRS en el ECG de superficie sigue siendo el criterio aceptado de asincronía en la selección de pacientes para terapia de resincronización cardiaca.

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