Application of a modified Polonovski reaction for serratinine (1) resulted in generation of serratezomine A (2) with a novel seco-serratinine-type skeleton recently isolated from the club moss Lycopodium serratum var. serratum. This biomimetic transformation supports a biogenetic pathway proposed for serratezomine A (2). The absolute stereochemistry of serratezomine A (2) was established by an ...

Resumo Objetivo Comparar o tempo de execução do banho no leito pelo método tradicional e a seco seus efeitos sobre as alterações oxi-hemodinâmicas em pacientes críticos. Métodos Ensaio clínico randomizado crossover, aberto, com 50 submetidos aos dois tipos leito: seco. Avaliou-se dos banhos variáveis (temperatura timpânica axilar, saturação oxigênio arterial, frequência respiratória, cardíaca p...

Risky land use decisions have led to large amounts of damages from flooding. Wildfires can potentially alter the risk of flooding by increasing the likeliness of high flow events due to multiple physical processes that increase the volume and intensity of runoff and erosion. In June and July of 2008, the Basin Complex fire burned 240,170 acres of the Arroyo Seco Watershed located in Monterey Co...

This document describes a rule learning framework called SeCo (derived from Separate-and-Conquer). This framework uses building blocks to specify each component that is needed to build up a configuration for a rule learner. It is based on a general separate-and-conquer algorithm. The framework allows to configurate any given rule learner that fulfills some properties. These are mainly that it e...

Asphaltenes from four different crude oils (Arab Heavy, B6, Canadon Seco, and Hondo) were fractionated in mixtures of heptane and toluene and analyzed chemically, by vapor pressure osmometry (VPO), and by small angle neutron scattering (SANS). Solubility profiles of the asphaltenes and their subfractions indicated strong cooperative asphaltene interactions of a particular subfraction that is po...

Rosangela da Silva*, Paulo Marcos Donate, Gil Valdo José da Silva, Susimaire Pedersoli a and Carlos Alemán Departamento de Química, Faculdade de Filosofia, Ciências e Letras de Ribeirão Preto, Universidade de São Paulo, Av. Bandeirantes, 3900, 14040-901 Ribeirão Preto SP, Brazil Departament d’Enginyería Química, E.T.S. d’Enginyers Industrials de Barcelona, Universitat Politécnica de Catalunya, ...

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A "stop-and-flow" strategy was developed for the chemoselective dioxygenation of alkenes with a PIFA-initiated cyclization. This method is conceived for the desymmetrization of seco-diene, and a series of substituted 5-hydroxymethyl-γ-lactones were constructed after hydrolysis. This strategy also differentiates terminally substituted alkenes and constitutes a potentially novel synthetic approac...

An investigation of the MeOH extract from the roots of Peritassa campestris (Hippocrateaceae) afforded two isomeric seco-A-ring quinonemethide triterpenoids, campestrine-I (1) and -II (2). This appears to be the first report of a C26,-type triterpene carbon skeleton from the Celastraceae or Hippocrateaceae families. The structures were elucidated on the basis of spectral data, particularly HMQC...