Analysis Of The Ergosterol Biosynthesis Pathway Cloning, Molecular Characterization And Phylogeny Of Lanosterol 14 α-demethylase (erg11) Gene Of Moniliophthora Perniciosa.

The phytopathogenic fungus Moniliophthora perniciosa (Stahel) Aime & Philips-Mora, causal agent of witches' broom disease of cocoa, causes countless damage to cocoa production in Brazil. Molecular studies have attempted to identify genes that play important roles in fungal survival and virulence. In this study, sequences deposited in the M. perniciosa Genome Sequencing Project database were analyzed to identify potential biological targets. For the first time, the ergosterol biosynthetic pathway in M. perniciosa was studied and the lanosterol 14α-demethylase gene (ERG11) that encodes the main enzyme of this pathway and is a target for fungicides was cloned, characterized molecularly and its phylogeny analyzed. ERG11 genomic DNA and cDNA were characterized and sequence analysis of the ERG11 protein identified highly conserved domains typical of this enzyme, such as SRS1, SRS4, EXXR and the heme-binding region (HBR). Comparison of the protein sequences and phylogenetic analysis revealed that the M. perniciosa enzyme was most closely related to that of Coprinopsis cinerea.

Enhanced Glucose-induced Intracellular Signaling Promotes Insulin Hypersecretion: Pancreatic Beta-cell Functional Adaptations In A Model Of Genetic Obesity And Prediabetes.

Obesity is associated with insulin resistance and is known to be a risk factor for type-2 diabetes. In obese individuals, pancreatic beta-cells try to compensate for the increased insulin demand in order to maintain euglycemia. Most studies have reported that this adaptation is due to morphological changes. However, the involvement of beta-cell functional adaptations in this process needs to be clarified. For this purpose, we evaluated different key steps in the glucose-stimulated insulin secretion (GSIS) in intact islets from female ob/ob obese mice and lean controls. Obese mice showed increased body weight, insulin resistance, hyperinsulinemia, glucose intolerance and fed hyperglycemia. Islets from ob/ob mice exhibited increased glucose-induced mitochondrial activity, reflected by enhanced NAD(P)H production and mitochondrial membrane potential hyperpolarization. Perforated patch-clamp examination of beta-cells within intact islets revealed several alterations in the electrical activity such as increased firing frequency and higher sensitivity to low glucose concentrations. A higher intracellular Ca(2+) mobilization in response to glucose was also found in ob/ob islets. Additionally, they displayed a change in the oscillatory pattern and Ca(2+) signals at low glucose levels. Capacitance experiments in intact islets revealed increased exocytosis in individual ob/ob beta-cells. All these up-regulated processes led to increased GSIS. In contrast, we found a lack of beta-cell Ca(2+) signal coupling, which could be a manifestation of early defects that lead to beta-cell malfunction in the progression to diabetes. These findings indicate that beta-cell functional adaptations are an important process in the compensatory response to obesity.

Fish Biodiversity Of The Vitória-trindade Seamount Chain, Southwestern Atlantic: An Updated Database.

Despite a strong increase in research on seamounts and oceanic islands ecology and biogeography, many basic aspects of their biodiversity are still unknown. In the southwestern Atlantic, the Vitória-Trindade Seamount Chain (VTC) extends ca. 1,200 km offshore the Brazilian continental shelf, from the Vitória seamount to the oceanic islands of Trindade and Martin Vaz. For a long time, most of the biological information available regarded its islands. Our study presents and analyzes an extensive database on the VTC fish biodiversity, built on data compiled from literature and recent scientific expeditions that assessed both shallow to mesophotic environments. A total of 273 species were recorded, 211 of which occur on seamounts and 173 at the islands. New records for seamounts or islands include 191 reef fish species and 64 depth range extensions. The structure of fish assemblages was similar between islands and seamounts, not differing in species geographic distribution, trophic composition, or spawning strategies. Main differences were related to endemism, higher at the islands, and to the number of endangered species, higher at the seamounts. Since unregulated fishing activities are common in the region, and mining activities are expected to drastically increase in the near future (carbonates on seamount summits and metals on slopes), this unique biodiversity needs urgent attention and management.

Nectar Robbery By A Hermit Hummingbird: Association To Floral Phenotype And Its Influence On Flowers And Network Structure.

Interactions between flowers and their visitors span the spectrum from mutualism to antagonism. The literature is rich in studies focusing on mutualism, but nectar robbery has mostly been investigated using phytocentric approaches focused on only a few plant species. To fill this gap, we studied the interactions between a nectar-robbing hermit hummingbird, Phaethornis ruber, and the array of flowers it visits. First, based on a literature review of the interactions involving  P. ruber, we characterized the association of floral larceny to floral phenotype. We then experimentally examined the effects of nectar robbing on nectar standing crop and number of visits of the pollinators to the flowers of Canna paniculata. Finally, we asked whether the incorporation of illegitimate interactions into the analysis affects plant-hummingbird network structure. We identified 97 plant species visited by P. ruber and found that P. ruber engaged in floral larceny in almost 30 % of these species. Nectar robbery was especially common in flowers with longer corolla. In terms of the effect on C. paniculata, the depletion of nectar due to robbery by P. ruber was associated with decreased visitation rates of legitimate pollinators. At the community level, the inclusion of the illegitimate visits of P. ruber resulted in modifications of how modules within the network were organized, notably giving rise to a new module consisting of P. ruber and mostly robbed flowers. However, although illegitimate visits constituted approximately 9 % of all interactions in the network, changes in nestedness, modularity, and network-level specialization were minor. Our results indicate that although a flower robber may have a strong effect on the pollination of a particular plant species, the inclusion of its illegitimate interactions has limited capacity to change overall network structure.

Encephalization And Diversification Of The Cranial Base In Platyrrhine Primates.

The cranial base, composed of the midline and lateral basicranium, is a structurally important region of the skull associated with several key traits, which has been extensively studied in anthropology and primatology. In particular, most studies have focused on the association between midline cranial base flexion and relative brain size, or encephalization. However, variation in lateral basicranial morphology has been studied less thoroughly. Platyrrhines are a group of primates that experienced a major evolutionary radiation accompanied by extensive morphological diversification in Central and South America over a large temporal scale. Previous studies have also suggested that they underwent several evolutionarily independent processes of encephalization. Given these characteristics, platyrrhines present an excellent opportunity to study, on a large phylogenetic scale, the morphological correlates of primate diversification in brain size. In this study we explore the pattern of variation in basicranial morphology and its relationship with phylogenetic branching and with encephalization in platyrrhines. We quantify variation in the 3D shape of the midline and lateral basicranium and endocranial volumes in a large sample of platyrrhine species, employing high-resolution CT-scans and geometric morphometric techniques. We investigate the relationship between basicranial shape and encephalization using phylogenetic regression methods and calculate a measure of phylogenetic signal in the datasets. The results showed that phylogenetic structure is the most important dimension for understanding platyrrhine cranial base diversification; only Aotus species do not show concordance with our molecular phylogeny. Encephalization was only correlated with midline basicranial flexion, and species that exhibit convergence in their relative brain size do not display convergence in lateral basicranial shape. The evolution of basicranial variation in primates is probably more complex than previously believed, and understanding it will require further studies exploring the complex interactions between encephalization, brain shape, cranial base morphology, and ecological dimensions acting along the species divergence process.

Towards A Deeper Understanding Of Structural Biomass Recalcitrance Using Phase-contrast Tomography.

The development of technological routes to convert lignocellulosic biomass to liquid fuels requires an in-depth understanding of the cell wall architecture of substrates. Essential pretreatment processes are conducted to reduce biomass recalcitrance and usually increase the reactive surface area. Quantitative three-dimensional information about both bulk and surface structural features of substrates needs to be obtained to expand our knowledge of substrates. In this work, phase-contrast tomography (PCT) was used to gather information about the structure of a model lignocellulosic biomass (piassava fibers). The three-dimensional cellular organization of piassava fibers was characterized by PCT using synchrotron radiation. This technique enabled important physical features that describe the substrate piassava fibers to be visualized and quantified. The external surface area of a fiber and internal surface area of the pores in a fiber could be determined separately. More than 96% of the overall surface area available to enzymes was in the bulk substrate. The pore surface area and length exhibited a positive linear relationship, where the slope of this relationship depended on the plant tissue. We demonstrated that PCT is a powerful tool for the three-dimensional characterization of the cell wall features related to biomass recalcitrance. Original and relevant quantitative information about the structural features of the analyzed material were obtained. The data obtained by PCT can be used to improve processing routes to efficiently convert biomass feedstock into sugars.

Mulheres indigenas: poder e tradição

This study contemplates reports and reflections about gender and the interfaces with work, power and woman's political participation within the Bororo indigenous communities in Mato Grosso, Guarani/Kaiowá and Kadiwéu ones, in Mato Grosso do Sul. In the study with the Bororo community, the woman valorization occurred because she represents the guardian of the culture and of the traditional knowledge, and at the same time, she is an important speaker for the Bororo and the non indigenous society. In the case of Guarani/Kaiowá community, the most important facts are, on one side, the departure of the men and their wish to become city men, and on the other, the women who wish or need to keep the Guarani identity and live in the reserve. In the Kadiwéu community, the most important fact is the women political power and a role division between men and women, without the attribution of more value to one role or the other.

Esclerite infecciosa espontânea por Nocardia asteroides: relato de caso

PURPOSE: To report a case of Nocardia asteroides scleritis in a patient without risk factors for infeccious scleritis. METHODS: A 38-year old woman was initially examined for pain, discharge, photophobia of 1 month duration in her right eye. Her medical and ophthalmological history were unremarkable. The results of laboratory tests were normal. Surgical debridement of necrotic tissue was performed and material was sent for biopsy and culture confirmed as Nocardia asteroides. Treatment consisted of amikacin eyedrops, and systemic trimethropim-sulfamethoxazole. The infection resolved leaving scleral thinning and a subconjunctival fibrovascular scar. Best corrected visual acuity two months after referral had improved to LE, 20/20. CONCLUSION: Prompt evaluation and treatment is essential for successful management of Nocardia asteroides infectious scleritis.

VUV spectral line emission measurements in the TCABR tokamak

The study of tokamak plasma light emissions in the vacuum ultraviolet (VUV) region is an important subject since many impurity spectral emissions are present in this region. These spectral emissions can be used to determine the plasma ion temperature and density from different species and spatial positions inside plasma according to their temperatures. We have analyzed VUV spectra from 500 Å to 3200 Å wavelength in the TCABR tokamak plasma including higher diffraction order emissions. There have been identified 37 first diffraction order emissions, resulting in 28 second diffraction order, 24 third diffraction order, and 7 fourth diffraction order lines. The emissions are from impurity species such as OII, OIII, OIV, OV, OVI, OVII, CII, CIII, CIV, NIII, NIV, and NV. All the spectra beyond 1900 Å are from higher diffraction order emissions, and possess much better spectral resolution. Each strong and isolated spectral line, as well as its higher diffraction order emissions suitable for plasma diagnostic is identified and discussed. Finally, an example of ion temperature determination using different diffraction order is presented.

A sexualidade de adolescentes vivendo com HIV: direitos e desafios para o cuidado

Sexualidade e saúde reprodutiva configuram questões relevantes para o cuidado integral à saúde de pessoas vivendo com HIV. Políticas públicas e serviços de saúde, entretanto, têm dedicado insuficiente atenção ao assunto. O objetivo deste trabalho é compreender como adolescentes e jovens soropositivos lidam com suas experiências sexuais e projetos de namoro, desejo de constituir família e de ter filhos. O estudo qualitativo entrevistou em profundidade 21 adolescentes vivendo com HIV (por transmissão vertical, sexual ou sanguínea) e 13 cuidadores de crianças e jovens, vivendo em São Paulo e em Santos, Brasil. As narrativas descrevem como aprenderam a lidar com a sexualidade e a ansiedade da revelação do diagnóstico nesse contexto. Destacam-se nas narrativas o despreparo, a desinformação sobre prevenção e a falta de apoio para lidar com a situação, assim como o estigma e a discriminação que atravessa grande parte das dificuldades relatadas. O artigo discute criticamente alguns dos desafios postos para uma adequada atenção à questão no Brasil, especialmente a consideração de jovens soropositivos como sujeitos de direitos sexuais, sugerindo diretrizes para a incorporação desta temática a um cuidado integral e humanizado de crianças e jovens vivendo com HIV.

Efficient synthesis of benzothiazine and acrylamide compounds

This article describes the synthesis of the new (2Z)-2-(4-methoxybenzylidene)-6-nitro-4H -benzo[1,4]thiazin-3-one, (2Z)-2-(4-methoxybenzylidene)-4-methyl-6-nitro-4H-benzo[1,4]thiazin-3-one, (2Z)-6-amino-2-(4-methoxybenzylidene)-4H -benzo[1,4]thiazin-3-one, (2Z)-6-butylamino-2-(4-methoxybenzylidene)-4-methyl-4H-benzo[1,4]-thiazin-3-one and (2E)-N-alkyl-N-(2-hydroxy-5-nitrophenyl)-3-phenylacrylamides and the spectroscopic data. The arylidenebenzothiazine compounds were prepared using the Knoevenagel condensation with substituted benzaldehydes in the presence of sodium methoxide in DMF. The presence of a nitro substituent in the 4-position, water and a slightly acid reaction medium in this condensation caused the rupture of the benzothiazine ring and subsequent formation of the phenylacrylamide compounds. A crystallographic data was presented for (2E)-3-(4-bromophenyl)-N-dodecyl-N -(2-hydroxy-5-nitrophenyl) acrylamide.

Vinculação determinística de Bancos de Dados sobre mortalidade por Aids

A vinculação determinística de bancos de dados sobre mortalidade por aids tem apresentado problemas causados por falhas nos arquivos. Assim, os objetivos deste estudo foram: avaliar o desempenho da vinculação determinística em bancos de óbito por aids do Programa de Aprimoramento das Informações de Mortalidade no Município de São Paulo (PRO-AIM) e da Fundação SEADE entre os anos de 2000 e 2004 e estimar a cobertura de cada banco. Utilizou-se a rotina merge de um software para vincular os bancos. A primeira etapa pareou os registros automaticamente e, na segunda etapa, cada banco foi conferido para localizar novos pares. Estimaram-se os óbitos pela soma entre casos pareados e não pareados para calcular a cobertura dos bancos. A primeira etapa da vinculação identificou 91,6% dos pares. A segunda etapa adicionou 457 pares. O total de óbitos foi estimado em 5.855, com cobertura de 97,1% do PRO-AIM e 96% do SEADE. O uso da vinculação determinística cobriu grande parte dos casos. O banco do PRO-AIM proporcionou a maior cobertura, com maior quantidade de informações completas e melhor localização geográfica dos casos.

Contraceptive use and associated factors among adolescents on Santiago Island - Cape Verde - Western Africa

OBJECTIVE: to estimate the prevalence of contraceptive use and associated factors among adolescents attending public schools on Santiago Island, Cape Verde. METHODS: a cross-sectional study was carried out with 368 sexually active adolescents aged 13-17years attending eight public elementary and high schools, randomly selected, on Santiago Island, Cape Verde, between January and March 2007. Poisson regression with robust variance was used for the multiple analysis of risk factors, at a 5% level of significance. RESULTS: among 368 adolescents, 69.3% reported having used a contraceptive method during the last act of sexual intercourse. The most frequently used method were condom (94.9%) and pill (26.4%). Factors significantly and positively associated with contraceptive use were: living in the capital (PR=1.23; CI95%: 1.07; 1.39); having dated and had sexual intercourse (PR =1.53; CI95%: 1.14;2.06); and having more than nine years of schooling (PR=1.19; CI95%: 1.02; 1.38). CONCLUSIONS: more educated adolescents who studied in Praia (the capital city) and were dating at the time of the study were more likely to use contraception. The high prevalence of condom use and the association between contraception use and years of schooling among adolescents may indicate that sexual and reproductive health policies have produced positive outcomes that may account for the decrease in HIV infection.

Condições de atmosfera controlada para pêssegos "maciel" colhidos em dois estádios de maturação

O objetivo deste trabalho foi avaliar o efeito de duas temperaturas e condições de atmosfera controlada (AC) sobre a conservação de pêssegos da cultivar Maciel, colhidos em dois estádios de maturação. Os tratamentos avaliados foram: armazenamento refrigerado (AR) na temperatura de +0,5°C; AR na temperatura de -0,5°C; 2,0kPa O2 + 4,0kPa CO2 em -0,5°C; 1,0kPa O2 + 3,0kPa CO2 em -0,5°C; 2,0kPa O2 + 6,0kPa CO2 em -0,5°C. As avaliações foram realizadas após 60 dias de armazenamento e mais dois e quatro dias de exposição dos frutos à temperatura de 20ºC. Na análise realizada após dois meses de armazenamento, mais dois dias a 20°C, verificou-se que os frutos submetidos a 2,0kPa de O2 + 4,0 kPa de CO2 apresentaram maior firmeza de polpa em relação aos demais tratamentos, sendo que a mesma não foi influenciada pelo estádio de maturação. Os sólidos solúveis totais foram maiores em frutos com estádio de maturação maduro independente da condição de armazenamento. A ocorrência de podridões e escurecimento interno da polpa não foi influenciada pelo estádio de maturação. No entanto, a condição de AC de 1,0 kPa de O2 + 3,0kPa de CO2 proporcionou o menor percentual de podridões e escurecimento interno da polpa em relação aos demais tratamentos. Na avaliação realizada aos quatro dias de exposição a 20°C, os frutos colhidos no estádio maduro estavam completamente podres, independente da condição de armazenamento praticada.

Previsão de bitter pit em maçãs por meio da infiltração de Mg2+ e da aplicação de ethephon nos frutos

Estudou-se o efeito da infiltração de magnésio e cálcio no desenvolvimento de sintomas de bitter pit de maçãs 'Gala'. Examinou-se, também, a eficiência da infiltração de magnésio e da aceleração da maturação de maçãs 'Royal Gala' como métodos de previsão da ocorrência de bitter pit após o armazenamento. No primeiro experimento, maçãs 'Gala' foram infiltradas com MgCl2; CaCl2 ou MgCl2 mais CaCl2. No segundo experimento, maçãs 'Royal Gala' foram infiltradas com MgCl2; ou imersas em solução contendo ethephon por cinco minutos. Como controle, frutos de cada cultivar foram armazenados em atmosfera controlada por seis meses mais 18 dias a 20°C. Frutos infiltrados com MgCl2 apresentaram significativo acréscimo na incidência e severidade de bitter pit, proporcional à concentração de MgCl2 na solução. Frutos infiltrados com CaCl2 não apresentaram sintomas de bitter pit. A aceleração da maturação de maçãs 'Royal Gala' na colheita foi efetiva na previsão de bitter pit após o armazenamento.