Preliminary evaluation of decolourisation of procion and everdirect dyes by yeasts

info:eu-repo/semantics/publishedVersio

Innovative approach for decolorizing textile effluents using yeast-alginate capsules

Textile industry is an economic activity that produces high volumes of effluents used in fabric processing that are discharged in the environment [1]. These discharged effluents loaded with synthetic dyes and other chemicals, are resistant to biodegradation and persistent in water, and are responsible for toxicity and mutagenic effects on the aquatic life, causing a potential risk to the aquatic ecosystems [2]. Traditionally, industry uses classic chemical methods to treat these effluents that are expensive and potentially harmful, since it could further generate large quantities of toxic by-products that are also difficult to eliminate [3]. In order to aid and complement the traditional wastewater treatment, a yeast-based solution for decolorization of textile industrial wastewater is under evaluation. This research aims to develop a new and innovative biological solution for the effective decolorization of the textile effluents usingalginate-calcium capsules filled with a proven decolorizing yeast.info:eu-repo/semantics/publishedVersio

Assessment of drying conditions of a yeast-based solution for application on textile industrial wastewater treatment plants

info:eu-repo/semantics/publishedVersio

Branching and Mixing: New Signals of the Ubiquitin Signaling System

Posttranslational modifications allow cells and organisms to adapt to their environment without the need to synthesize new proteins. The ubiquitin system is one of the most versatile modification systems as it does not only allow a simple on–off modification but, by forming a chain of ubiquitin molecules, allows conveying multiple signals. The structure of the chains is dependent on the linkage to the previous ubiquitin molecule as every lysine can serve as an acceptor point for this modification. Different chain types code for specific signals ranging from protein degradation to protein targeting different cellular compartments. Recently the code of ubiquitin signals has been further expanded as branching and mixing of different chain types has been detected. As an additional layer of complexity, modifications of the ubiquitin chain by ubiquitin-like modifiers, like NEDD8, SUMO, or ISG15, have been found. Here we will discuss the different chain types and the technical challenges which are associated with analyzing ubiquitin topology-based signaling

Optimizing the Parameters Governing the Fragmentation of Cross-Linked Peptides in a Tribrid Mass Spectrometer

We compared the five different ways of fragmentation available on a tribrid mass spectrometer and optimized their collision energies with regard to optimal sequence coverage of cross-linked peptides. We created a library of bis­(sulfosuccinimidyl)­suberate (BS3/DSS) cross-linked precursors, derived from the tryptic digests of three model proteins (Human Serum Albumin, creatine kinase, and myoglobin). This enabled in-depth targeted analysis of the fragmentation behavior of 1065 cross-linked precursors using the five fragmentation techniques: collision-induced dissociation (CID), beam-type CID (HCD), electron-transfer dissociation (ETD), and the combinations ETciD and EThcD. EThcD gave the best sequence coverage for cross-linked <i>m</i>/<i>z</i> species with high charge density, while HCD was optimal for all others. We tested the resulting data-dependent decision tree against collision energy-optimized single methods on two samples of differing complexity (a mix of eight proteins and a highly complex ribosomal cellular fraction). For the high complexity sample the decision tree gave the highest number of identified cross-linked peptide pairs passing a 5% false discovery rate (on average ∼21% more than the second best, HCD). For the medium complexity sample, the higher speed of HCD proved decisive. Currently, acquisition speed plays an important role in allowing the detection of cross-linked peptides against the background of linear peptides. Enrichment of cross-linked peptides will reduce this role and favor methods that provide spectra of higher quality. Data are available via ProteomeXchange with identifier PXD006131

Crosstalk between ROS Homeostasis and Secondary Metabolism in S. natalensis ATCC 27448: Modulation of Pimaricin Production by Intracellular ROS

Streptomyces secondary metabolism is strongly affected by oxygen availability. The increased culture aeration enhances pimaricin production in S. natalensis, however the excess of O2 consumption can lead to an intracellular ROS imbalance that is harmful to the cell. The adaptive physiological response of S. natalensis upon the addition of exogenous H2O2 suggested that the modulation of the intracellular ROS levels, through the activation of the H2O2 inducible catalase during the late exponential growth phase, can alter the production of pimaricin. With the construction of defective mutants on the H2O2 related enzymes SodF, AhpCD and KatA1, an effective and enduring modulation of intracellular ROS was achieved. Characterization of the knock-out strains revealed different behaviours regarding pimaricin production: whilst the superoxide dismutase defective mutant presented low levels of pimaricin production compared to the wild-type, the mutants defective on the H2O2-detoxifying enzymes displayed a pimaricin overproducer phenotype. Using physiological and molecular approaches we report a crosstalk between oxidative stress and secondary metabolism regulatory networks. Our results reveal that the redox-based regulation network triggered by an imbalance of the intracellular ROS homeostasis is also able to modulate the biosynthesis of pimaricin in S. natalensis

Evolução da técnica de PCR: sua contribuição no diagnóstico da infecção por HPV

Introdução: a reação em cadeia da polimerase (PCR) é a técnica de biologia molecular mais utilizada na detecção viral, principalmente em situações onde a quantidade de DNA disponível é pequena. O papilomavírus humano (HPV) representa um dos mais graves problemas de saúde pública e está associado ao câncer do colo do útero, especialmente em países em desenvolvimento, como o Brasil, que desde 2009 já apresentava 40 mil novos casos por ano. Objetivo: descrever a evolução da PCR e sua contribuição no diagnóstico do HPV. Metodologia: realizou-se uma revisão de literatura a partir de publicações disponíveis em base de dados eletrônicos, como Science Direct, SciELO, Pubmed, Instituto Nacional do Câncer e Ministério da Saúde do Brasil, nos últimos cinco anos. Resultados: dentre as técnicas citadas nesta revisão de literatura, todas têm alta relevância na detecção de genotipagem do HPV, embora a escolha quanto ao melhor desempenho fique a critério do pesquisador. A técnica de Nested PCR demonstra ser a mais vantajosa na detecção do vírus, pelo fato de ter uma maior sensibilidade, em comparação com as demais. Conclusão: a técnica PCR possui alta sensibilidade (90-100%) e apresenta 92,8 a 100% de especificidade, sendo padrão ouro para a detecção de DNA do HPV, em amostras citológicas do câncer de colo do útero. Assim, os dados obtidos permitem constatar que a técnica PCR, utilizada para o rastreamento do HPV, é considerada padrão ouro, tendo maior sensibilidade, especificidade e velocidade de análise, devendo ser o método de escolha para o diagnóstico eficiente do HPV

A Simple in situ Assay to Assess Plant-Associative Bacterial Nitrogenase Activity

Assessment of plant-associative bacterial nitrogen (N) fixation is crucial for selection and development of elite diazotrophic inoculants that could be used to supply cereal crops with nitrogen in a sustainable manner. Although diazotrophic bacteria possess diverse oxygen tolerance mechanisms, most require a sub 21% oxygen environment to achieve optimal stability and function of the N-fixing catalyst nitrogenase. Consequently, assessment of N fixation is routinely carried out on “free-living” bacteria grown in the absence of a host plant and such experiments may not accurately divulge activity in the rhizosphere where the availability and forms of nutrients such as carbon and N, which are key regulators of N fixation, may vary widely. Here, we present a modified in situ acetylene reduction assay (ARA), utilizing the model cereal barley as a host to comparatively assess nitrogenase activity in diazotrophic bacteria. The assay is rapid, highly reproducible, applicable to a broad range of diazotrophs, and can be performed with simple equipment commonly found in most laboratories that investigate plant-microbe interactions. Thus, the assay could serve as a first point of order for high-throughput identification of elite plant-associative diazotrophs