Extração, caracterização e atividades biológicas de proteínas da espécie cnidoscolus urens (L.) Arthur

The extraction, chemical and structural characterization of a wide variety of compounds derived from plants has been a major source of bioactive molecules. Several proteases have been isolated in the plant kingdom, with numerous pharmacological and biotechnological applications. Among the proteases isolated from plants, are the fibrinogenolytic, with relevant application in the treatment of disorders in the coagulation cascade, in addition to potential use as a tool in clinical laboratories. In this study, in addition to evaluating the effects of the protein extract of Cnidoscolus urens (L.) Arthur (Euphorbiaceae) in the coagulation cascade also investigates the presence of antimicrobial activity and characterizes the proteolytic activity detected in this extract, aiming to determine their potential pharmacological and biotechnological application. In this way, crude protein extracts obtained from the leaves of C. urens in Tris-HCl 0.05M, NaCl 0.15M, pH 7.5, were precipitated in different concentrations of acetone, and assessed for the presence of proteolytic activity in azocaseína and fibrinogen. The most active fraction (F1.0) in these tests was chosen for assessment of biological activity and biochemical characterization. The Aα chain and Bβ of fibrinogen were completely cleaved at a concentration of 0.18 μg/μL of protein fraction in 4 minutes. Fibrinogenolytic activity presented total inhibition in the presence of E-64 and partial in the presence of EDTA. The fraction demonstrated coagulant activity in plasm and reduced the APTT, demonstrating acting on the factors coagulation of the intrinsic pathway and common, not exerting effects on the PT. Fibrinolytic activity on plasma clot was detected only in SDS-PAGE in high concentrations of fraction, and there were no defibrinating. Although several proteases isolated from plants and venomous animals are classically toxic, the fraction F1.0 of C. urens not expressed hemorrhagic nor hemolytic activities. Fraction F1.0 also showed no antimicrobial activity. In proteolytic activity on the azocasein, the optimal pH was 5.0 and optimum temperature of 60ºC. The enzyme activity has been shown to be sensitive to the presence of salts tested, with inhibition for all compounds. The surfactant triton did not influence the enzyme activity, but the tween-20 and SDS inhibited the activity. In the presence of reducing agents increase in enzyme activity occurred, a typical feature of enzymes belonging to the class of cysteine proteases. Several bands with proteolytic activity were detected in zymogram, in the region of high-molecular-weight, which were inhibited by E-64. In this study, we found that C. urens presents in its constitution cysteine proteases with fibrinogenolytic and procoagulant activity, which may be isolated, with potential application in treatment of bleeding disorders, thrombolytic and clinical laboratory

E Rimbaud se fez Rimbauds

Rimbaud, de 16 à 20 ans, a promu le nouveau des idées et formes de la poésie, en abandonnant la tradition par la recherche de l'inconnu, du nouveau verbe poétique où «je est un autre» et contient Rimbauds, multiple. Selon cette perspective, nous limitons la première partie de ce travail, un profil de ce Rimbauds qui concerne: son «Adieu» à la poésie sous la forme de silence: «Je est un autre» - dans laquelle nous avons également parlé du style, l'innovation et caractéristiques, la question - projet poétique?, et, enfin, le mimétisme littéraire de ses premiers poèmes. Dans la seconde partie, on aborde sa poésie, en particulier ses deux proses majeures «Une saison en enfer» et «Illuminations». De la Saison, ont fait des considérations sur ses proses, les proses narratives précédants et les sept proses centrales, dont détaillée de la «Nuit de l'enfer» et illustrent deux caractéristiques de Rimbaud: indécidabilité et incompossibilité. Des «Illuminations» on a saisi les poèmes Ville et Villes «I et II» pour les étudier sous l optique du non-lieu. On travaille encore un autre concept, de la façon dont il est présenté, sept fois dans les Proses, la notion de l Orient :commme il apparaît dans chaque livre, ce qu il signifie et où Rimbaud a cherché ces représentations