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Search Results: 1 - 4 of 4 matches for " Delprete "
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Systematics, taxonomy and floristics of Brazilian Rubiaceae: an overview about the current status and future challenges
Delprete, Piero Giuseppe;Jardim, Jomar Gomes;
Rodriguésia , 2012, DOI: 10.1590/S2175-78602012000100009
Abstract: the rubiaceae is the fourth angiosperm family in number of species in the world and in the neotropics. its overwhelming diversity and presence in most biomes, and at most vegetation layers, makes this family one of the most important components of tropical vegetation. during the last two decades, family classification went through several reorganizations, mostly influenced by the advent of molecular phylogenetic studies, and many taxonomic revisions and floristic studies on brazilian rubiaceae have become available. in view of the considerable amount of literature that has recently been produced on neotropical rubiaceae, the present work has two main objectives: the first is to offer an overall view of the most recent family classification with emphasis on the genera of rubiaceae occurring in brazil, and to indicate particular taxa that are still in need of phylogenetic and taxonomic studies; the second objective is to present a short discussion on the state of floristic and taxonomic knowledge with respect to the various regions of brazil, indicating the taxa and the geographic areas that need to be studied.
ANOVA parameters influence in LCF experimental data and simulation results
Delprete C.,R. Sesanaa,Vercelli A.
EPJ Web of Conferences , 2010, DOI: 10.1051/epjconf/20100643003
Abstract: The virtual design of components undergoing thermo mechanical fatigue (TMF) and plastic strains is usually run in many phases. The numerical finite element method gives a useful instrument which becomes increasingly effective as the geometrical and numerical modelling gets more accurate. The constitutive model definition plays an important role in the effectiveness of the numerical simulation [1, 2] as, for example, shown in Figure 1. In this picture it is shown how a good cyclic plasticity constitutive model can simulate a cyclic load experiment. The component life estimation is the subsequent phase and it needs complex damage and life estimation models [3-5] which take into account of several parameters and phenomena contributing to damage and life duration. The calibration of these constitutive and damage models requires an accurate testing activity. In the present paper the main topic of the research activity is to investigate whether the parameters, which result to be influent in the experimental activity, influence the numerical simulations, thus defining the effectiveness of the models in taking into account of all the phenomena actually influencing the life of the component. To obtain this aim a procedure to tune the parameters needed to estimate the life of mechanical components undergoing TMF and plastic strains is presented for commercial steel. This procedure aims to be easy and to allow calibrating both material constitutive model (for the numerical structural simulation) and the damage and life model (for life assessment). The procedure has been applied to specimens. The experimental activity has been developed on three sets of tests run at several temperatures: static tests, high cycle fatigue (HCF) tests, low cycle fatigue (LCF) tests. The numerical structural FEM simulations have been run on a commercial non linear solver, ABAQUS 6.8. The simulations replied the experimental tests. The stress, strain, thermal results from the thermo structural FEM simulations have been used to assess specimens life by means of several damage models implemented in two dedicated softwares. One of them is commercial life estimation software and the second one has been developed by the present research group. The life estimations results obtained from the two softwares and from the damage models have been compared with experimental duration in different test conditions. A statistical analysis of life estimation results allowed evaluating the effectiveness of the procedure.
Chemotaxonomic significance of flavonoids, coumarins and triterpenes of Augusta longifolia (Spreng.) Rehder, Rubiaceae-Ixoroideae, with new insights about its systematic position within the family
Choze, Rafael;Delprete, Piero G.;Li?o, Luciano M.;
Revista Brasileira de Farmacognosia , 2010, DOI: 10.1590/S0102-695X2010000300002
Abstract: augusta has traditionally been placed in the tribe rondeletieae, subfamily cinchonoideae. however, recent molecular phylogenies positioned it near to wendlandia (ixoroideae), but locate a. longifolia near to the clade ixoroidinae ii. the study of a. longifolia afforded two coumarins, five flavonoids, three triterpenoids and one benzoic acid derivative. these metabolites reinforce the separation of augusta as a monospecific genus, and lindenia as a genus of three species, closely related to wendlandia.
Antiprotozoal alkaloids from Psychotria prunifolia (Kunth) Steyerm
Lucilia, Kato;Oliveira, Cecília M. A. de;Faria, Emiret O.;Ribeiro, Laryssa C.;Carvalho, Brenda G.;Silva, Cleuza C. da;Schuquel, Ivania T. A.;Santin, Silvana M. O.;Nakamura, Celso V.;Britta, Elisandra A.;Miranda, Nathielle;Iglesias, Amadeu H.;Delprete, Piero G.;
Journal of the Brazilian Chemical Society , 2012, DOI: 10.1590/S0103-50532012000200024
Abstract: the continuity of the phytochemical study of crude extracts of p. prunifolia's roots and branches led to the isolation of five indole-β-carboline alkaloids. among them, the 10-hydroxy-iso-deppeaninol and n-oxide-10-hydroxy-antirhine derivatives are described here for the first time. the structures were achieved through 1d and 2d nmr, ir and hrms analyses. the branches and roots crude extracts and the alkaloids 14-oxoprunifoleine and strictosamide showed selective activity against l. amazonensis, with ic50 values of 16.0 and 40.7 μg per ml, respectively.
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