FUNGOS ASSOCIADOS À CASCA DO CAULE DE Platanus orientalis L.

Influence of Environmental Pollution on Leaf Properties of Urban Plane Trees, Platanus orientalis L.

To investigate whether leaves of plane trees (Platanus orientalis) are damaged by traffic pollution, trees from a megacity (Mashhad, Iran) and a rural area were investigated. Soil and air from the urban centre showed enrichment of several toxic elements, but only lead was enriched in leaves. Leaf size and stomata density were lower at the urban site. At the urban site leaf surfaces were heavily...

C&L: Uma Ferramenta de Apoio à Engenharia de Requisitos

This paper presents an experimental tool to support requirements engineering activities. This tool, called C&L, is based on two techniques to model software requirements, Scenarios and the Extend Lexicon of the Language. C&L supports a cooperative process to edit Scenarios and the Lexicon. It aims to maintain the traceability between requirements and code. C&L is one of the Requirements Enginee...

Les politiques de l''invisible - Du mythe de l'intégration à la fabrique de l''évidence

A lot of discourses about the so-called « screen civilization » pay little attention to screens. They usually speculate about a supposed cyberspace instead of examining the visible forms of effective communication. This paper looks at what is visible or invisible on computer-supported medias. To do this, it considers both the semiotics of visible signs displayed on the screen and the metasemiot...

Triterpenoid Saponins from Stem Bark of Pentaclethra macroloba

Duas novas e duas conhecidas saponinas triterpênicas foram isoladas da casca do caule de Pentaclethra macroloba. As estruturas foram determinadas usando uma combinação de técnicas de RMN homo(1D: RMNH, RMNC-{H}, RMNC-DEPT135; 2D: H-H-COSY, H-HTOCSY, H-H-NOESY) and heteronuclear 2D (HMQC and HMBC), espectros de massas obtidos com ionização por pulverização eletrônica (ESIMS) e métodos químicos. ...

Contribution à l'étude de la maladie athéromateuse