The anaerobic decomposition in landfills produces a gas mixture known as landfill biogas. This biogas consists mainly of CH4 and CO2. The CO2 removal can be carried out by means of adsorption. In order to promote CO2 removal, zeolite type 4A was used as solid adsorbent. The synthesized zeolite was characterized by scanning electron microscopy and X-ray diffraction. CH4/CO2 mixture isotherms were obtained in a magnetic suspension balance equipped with a gas dosing unit and Extended Langmuir and Extended Sips models were used to predict mixture isotherms from monocomponent data. Three biogas emissions drains in a sanitary landfill in Caucaia (Ceará State, Brazil) - ASMOC - were chosen to test the performance of zeolite as CO2 adsorbent under real conditions. Zeolite 4A has proven to be very selective for CO2 even in the presence of H2S.

RESUMO A remoção de poluentes de efluentes industriais de forma efetiva e economicamente viável ainda é um desafio. Dessa forma, o presente trabalho propôs investigar a tecnologia de eletrocoagulação (EC) para o tratamento de efluente têxtil utilizando corrente contínua pulsada (CCP). A metodologia de superfície de resposta Box-Behnken foi utilizada para analisar e otimizar as condições operacionais, visando à máxima remoção de demanda química de oxigênio (DQO). Os experimentos foram realizados com um volume reacional de 2,6 L, em modo batelada. Diante dos resultados obtidos, a configuração ótima considerada foi: velocidade de agitação = 200 rpm, frequência dos pulsos = 1.000 Hz e espaçamento entre os eletrodos = 1 mm, em 50 minutos de EC. Nessas condições foi obtida uma remoção de DQO de 81,23% (valor remanescente de 152 mg O2.L-1). Em adição, verificou-se que o processo de EC também é eficaz para a redução de cor, turbidez, sólidos suspensos totais, sulfato e sulfeto. A concentração de íons cloreto não foi alterada durante a EC, apresentando-se como um aspecto favorável para a reutilização do efluente tratado no próprio processo produtivo têxtil, o qual demanda uma elevada concentração de NaCl.

ABSTRACT The effective and economically viable removal of industrial wastewater pollutants is still a challenge. Thus, this study proposed to investigate the electrocoagulation technology (EC) for the treatment of textile effluent using pulsed direct current (CCP). The methodology of Box-Behnken response surface was used to analyze and optimize the operating conditions, aimed at maximum chemical oxygen demand (COD) removal. The experiments were performed with a reaction volume of 2.6 L in batch mode. Based on these results, the optimal configuration was: agitation speed = 200 rpm, frequency of pulses = 1,000 Hz and spacing between electrodes = 1 mm, in 50 minutes of EC. Under these conditions it was obtained a COD removal of 81.23% (remainder value of 152 mg O2.L-1). In addition, it was found that the EC process is also effective for reduction of color, turbidity, total suspended solids, sulfate and sulfide. The concentration of chloride ions was not modified during the EC, presenting itself as a favorable aspect for the reuse of treated wastewater in the textile production process itself, which demands a high concentration of NaCl.

Perfumes are products mainly consisting of ethyl alcohol, water and fragrance. These fragrances are responsible for characterizing the pleasant and unique odor of each perfume. Among the fragrances, we highlight a group of fragrances which can cause contact allergy, leading to dermatitis. Brazilian and the European law state that when these concentrations of allergenic fragrances exceed the limit of 0.01% for non-rinse products and 0.001% for products with rinsing, the manufacturer is obliged to discriminate on its label their presence. This work aims to quantify allergic fragrances in original and Brazilian perfume using solid-phase microextraction and analyze by gas chromatography-mass detector.

Volatile organic compounds (VOCs) from ten endophytic fungal species belonging to the Botryosphaeriaceae family were extracted by headspace-solid phase micro-extraction (HS-SPME) and analyzed by gas chromatography-mass spectrometry (GC-MS). Thirty-four VOCs were identified. Most of the compounds are sesquiterpenes (14 non-oxygenated and 10 oxygenated), and two linear ketones and eight alcohols were also identified. Multivariate data analysis (PCA and HCA) allowed the differentiation of all investigated species, and proved to be efficient for the differentiation of Neofusicocum parvum and N. ribis, which are considered very similar species. α-Bisabolol, α-selinene, α-cedrene epoxide and guaiol acetate were suggested as biomarkers.

<p>An efficient, fast and cost-effective method for detecting adulteration in perfumes by UV spectroscopy and multivariate analysis is proposed. Classification of perfumes, either as original or fake, was accomplished with the spectroscopic data using chemometric techniques such as principal component analysis (PCA), soft independent modeling of class analogy (SIMCA) and linear discriminant analysis (LDA).</p>

OBJETIVO: Investigar a eficácia da cola de fibrina e da sutura usando fio de ácido poliglicólico para promover o fechamento da cúpula vaginal de coelhas, após histerectomia abdominal. MÉTODOS: Vinte coelhos fêmeas, New Zealand, adultas foram submetidas à histerectomia abdominal e distribuídas para sutura da cúpula vaginal com fio de ácido poliglicólico (G-PA / n=10) ou cola de fibrina (G-FG / n=10). Estudo radiológico foi realizado para identificar deiscências ou fístulas vesicais ou retais. Videovaginoscopia foi realizada para identificar a presença de secreções, abscessos, tecido de granulação ou granuloma tipo corpo estranho. Teste in vitro de pressão de rompimento sob selo d'água foi realizado para identificar a perviedade da sutura. O tecido de cicatrização foi estudado pela coloração com picrosirius red para mensuração do tecido fibrótico. RESULTADOS: A videovaginoscopia mostrou uma diferença significante (Teste de Fisher p<0,3142) no tecido de granulação do grupo G-PA (40%) em comparação com o grupo G-FG (20%). A análise macroscópica mostrou a mesma relação com o tecido de granulação (Teste de Fisher p< 0.1749) com G-PA (50%) e G-FB (20%). A aderência visceral à cúpula vaginal foi estatisticamente significativa (Teste de Fisher p< 0.1749) com o G-PA (50%) e G-FG (20%). A pressão de rompimento (mmHg) foi similar (p<0.0421) nos animais do grupo G-PA (61.5±19.3) e G-FG (72.5±21.9). A matriz colagenosa do tecido de cicatrização teve resultados semelhantes (p< 0.0231) entre G-PA (31.63±15) e G-FG (23.2±13.2). CONCLUSÃO: O fechamento da cúpula vaginal usando cola de fibrina é um procedimento seguro e confiável após histerectomia abdominal em coelhos fêmeas.

PURPOSE: To investigate the effectiveness of fibrin glue in comparison with polyglycolic acid suture to promote the closure of rabbit's vaginal vault, after abdominal hysterectomy. METHODS: Twenty female, adults, New Zealand rabbits, were submitted to abdominal hysterectomy and randomly distributed to polyglycolic acid suture (G-PA / n=10) or fibrin glue closure of vaginal vault (G-FG / n=10). Radiograph study allowed identifying vault vaginal suture disrupter or fistulas to urinary bladder or rectum. Videovaginoscopy study allowed identifying the presence of cellulites, abscess formation, tissue granulation or granuloma. Vaginal cuff burst test allowed to identify by the escape of air bubbles and rupture pression record. Histological sections stained with Picrosirius red allowed the measure of fibrous tissue healing. RESULTS: The videovaginoscopy identified a significant difference (Fisher Test p<0.3142) of granulation tissue in the animals of G-PA (40%) in comparison with the G-FG (20%). The gross inspection showed the same relation in the granulation tissue occurrence (Fisher test p< 0.1749) with G-PA (50%) and G-FB (20%). The visceral adhesion to the vaginal vault wound was statistical significant (Fisher test p< 0.1749) with G-PA (50%) and G-FG (20%). The pressure of rupture (mm Hg) of the burst test was similar (p<0.0421) in the animals of G-PA (61.5±19.3) and G-FG (72.5±21.9). The collagen matrix of vault wound healing was similar (p< 0.0231) between the G-PA (31.63±15) and the G-FG (23.2±13.2). CONCLUSION: The vaginal vault closure using the fibrin glue is a safe and reliable procedure after abdominal hysterectomy in female rabbit model.

Neste artigo, pretendo discutir como, num contexto racializado da associação entre juventude negra e música, surgem experiências que se desenvolvem como marcas identitárias, crítica social e ratificação de hierarquias raciais, de classe e gênero. Para tanto, trabalho com as idéias de juventude e geração como dado biológico, tanto quanto social e histórico, e com a idéia de música como sentido compartilhado. Além disso, rediscuto minhas notas etnográficas e de outros autores que refletiram sobre a relação entre música e juventude negra, cujos jovens observados, em contextos diversificados, são basicamente suburbanos, pobres e "negro-mestiços" com baixo grau de escolaridade, alguns com baixa capacidade de consumo, outros consumidores ansiosos. Concluo apontando para a importância da música como instrumento configurador de uma experiência juvenil e negra afro-diaspórica, mas também como instrumento repositor de antigas dessemelhanças que não estão nos genes.

In this article, I intend to discuss how, in the racialized context of the association between black youth and music, experiences arise and develop as identity marks, social criticism and the ratification of racial, class and gender hierarchies. To do so, I work with the idea of youth and generation as not only a biological, but also a social and historical data, and with the idea of music as a shared sense. Besides, I discuss my own ethnographical observations as well as those of other authors who reflected on the relationship between music and black youth and have basically observed, in various contexts, young, poor, partly Negro suburbanites with low schooling, some having a low buying power, others being anxious consumers. I conclude pinpointing the importance of music as a configuration instrument for a youthful and black Diaspora experience, but also as an instrument that renews old dissimilarities that are not genetic.