M. Fátima das G. F. da Silva
Other affiliations: Universidade Estadual de Londrina
Bio: M. Fátima das G. F. da Silva is an academic researcher from Federal University of São Carlos. The author has contributed to research in topic(s): Limonoid & Atta sexdens. The author has an hindex of 26, co-authored 94 publication(s) receiving 1866 citation(s). Previous affiliations of M. Fátima das G. F. da Silva include Universidade Estadual de Londrina.
TL;DR: The fruits of Neoraptua magnifica afforded three new flavonoids: 2'-hydroxy-4,4',-dimethoxy-5',6'-(2'',2''-dimethylpyrano)chalcone, and 3',4'-methylenedioxy-5,6,7-trimethoxyflavone, which were identified on the basis of spectroscopic methods.
Abstract: The fruits of Neoraptua magnifica var. magnifica afforded three new flavonoids: 2'-hydroxy-4,4',-dimethoxy-5',6'-(2'',2''-dimethylpyrano)chalcone, 2'-hydroxy-3,4,4'-trimethoxy-5',6'-(2'',2''-dimethylpyrano)chalcone, and 3',4'-methylenedioxy-5,7-dimethoxyflavone which were identified on the basis of spectroscopic methods. The known flavonoids 2'-hydroxy-3,4,4',5-tetramethoxy-5',6'-(2'',2''-dimethylpyrano)chalcone, 2'-hydroxy-3,4,4',5,6'-pentamethoxychalcone, 3',4'-methylenedioxy-5,6,7-trimethoxyflavone, 3',4'-methylenedioxy-5',5,6,7-tetramethoxyflavone, 3',4',5',5,7-pentamethoxyflavanone and 3',4',5'5,7-pentamethoxyflavone were also identified. The latter flavone was the most active as glyceraldehyde-3-phosphate dehydrogenase-inhibitor.
Abstract: Nine limonoids were isolated from Carapa guianensis and Cedrela fissilis Among them, 1,2-dihydro-3b-hydroxy-7-deacetoxy-7-oxogedunin is a new compound Moreover, the assignments of some chemical shifts of xyloccensin k have been corrected and 1H NMR data of 7-deacetylgedunin have been assigned for the first time These isolated limonoids were assayed on Atta sexdens rubropilosa workers showing moderate insecticidal activities
TL;DR: Evolutionary trends of meliacin chemistry thus correspond to the morphological division of the Meliaceae, according to their basic skeletal specialization and state of oxidation.
Abstract: The structural types of limonoids or meliacins can be characterized in terms of complexity by their position along biosynthetic routes on a biogenetic map, as well as by their basic skeletal specialization and state of oxidation. Genera of the Melioidease, one major subfamily of the Meliaceae, contain meliacins formed along several biosynthetic routes and characterized by relatively low skeletal specializations and oxidation states. Genera of the Swietenioideas, the other major subfamily of the Meliceae, contain meliacins formed along only one biosynthetic route and characterized by relatively high skeletal specializations and oxidation states. Evolutionary trends of meliacin chemistry thus correspond to the morphological division of the Meliaceae.
TL;DR: The inhibitory effects of a small library of natural and synthetic anacardic acid derivatives against the target enzyme showed clear noncompetitive inhibition with respect to both substrate and cofactor, indicating that aggregate-based inhibition did not occur.
Abstract: Chagas’ disease, a parasitic infection caused by the ﬂagellate protozoan Trypanosoma cruzi, is a major pub-lic health problem affecting millions of individuals in Latin America. On the basis of the essential role inthe life cycle of T. cruzi, the glycolytic enzyme glyceraldehyde-3-phosphate dehydrogenase (GAPDH) hasbeen considered an attractive target for the development of novelantitrypanosomatid agents. In thepres-ent work, we describe the inhibitory effects of a small library of natural and synthetic anacardic acidderivatives against the target enzyme. The most potent inhibitors, 6-n-pentadecyl- (1) and 6-n-dodecyl-salicilic acids (10e), have IC 50 values of 28 and 55 l M, respectively. The inhibition was not reversed orprevented by the addition of Triton X-100, indicating that aggregate-based inhibition did not occur. Inaddition, detailed mechanistic characterization of the effects of these compounds on the T. cruzi GAP-DH-catalyzed reaction showed clear noncompetitive inhibition with respect to both substrate andcofactor. 2008 Elsevier Ltd. All rights reserved.
Abstract: Astilbin was isolated in high yield from Dimorphandra mollis, and its insecticidal and growth inhibiting activity by stomach ingestion were evaluated against Anticarsia gemmatalis and Spodoptera frugiperda. The insecticidal activity of astilbin, the weight reduction of the larval phase and the prolongation of the larval and pupal phases were verified for both species. Astilbin was identified on the base of its NMR, MS and physical data.
Joseph P. Michael1•Institutions (1)
TL;DR: This review covers the isolation, structure determination, synthesis and biological activity of quinoline, quinazoline and acridone alkaloids from plant, microbial and animal sources.
Abstract: Covering: July 2005 to June 2006. Previous review: Nat. Prod. Rep., 2007, 24, 223–246 This review covers the isolation, structure determination, synthesis and biological activity of quinoline, quinazoline and acridone alkaloids from plant, microbial and animal sources; 115 references are cited.
TL;DR: A historical introduction of drugs assayed against Chagas disease beginning in 1912 with the works of Mayer and Rocha Lima up to the experimental use of nitrofurazone, and a survey about new classes of synthetic and natural compounds studied after 1992/1993.
Abstract: In this "Critical Review" we made a historical introduction of drugs assayed against Chagas disease beginning in 1912 with the works of Mayer and Rocha Lima up to the experimental use of nitrofurazone. In the beginning of the 70s, nifurtimox and benznidazole were introduced for clinical treatment, but results showed a great variability and there is still a controversy about their use for chronic cases. After the introduction of these nitroheterocycles only a few compounds were assayed in chagasic patients. The great advances in vector control in the South Cone countries, and the demonstration of parasite in chronic patients indicated the urgency to discuss the etiologic treatment during this phase, reinforcing the need to find drugs with more efficacy and less toxicity. We also review potential targets in the parasite and present a survey about new classes of synthetic and natural compounds studied after 1992/1993, with which we intend to give to the reader a general view about experimental studies in the area of the chemotherapy of Chagas disease, complementing the previous papers of Brener (1979) and De Castro (1993).
Robert F. Thorne1•Institutions (1)
Abstract: Thome, Robert F. (Rancho Santa Ana Botanic Garden, Claremont, CA 91711). Classification and geography of the flowering plants. Bot. Rev.58(3): 225–348. 1992.—This treatment of the flowering plants is the latest revision of my classification of the Class Angiospermae and replaces my 1983 and more recent 1992 synopses. An update is necessary because so much new information has been published in the last decade pertinent to the classification of the flowering plants. About 870 such recent books, monographs, and other botanical papers are cited in the Introduction, listed primarily by the botanical discipline that they represent. Also considerable changes in my classification have been necessitated by my narrowed family- and ordinal-gap concepts, acceptance of the ending “-anae” for superorders in place of the traditional but inappropriate “-iflorae,” and acceptance of more prior or more widely used names for the categories above the family. A new phyletic “shrub” replaces earlier versions, and attempts to indicate visually relative sizes and relationships among the superorders, orders, and suborders. One table includes a statistical summary of floweringplant taxa: ca. 233,900 species of 12,650 genera, 437 families, and 708 subfamilies and undivided families in 28 superorders, 71 orders, and 71 suborders of Angiospermae. Three other tables summarize the known indigenous distribution of the families and subfamilies of angiosperms about the world. The synopsis lists the flowering plant taxa from the class down to the subfamily (and in Asteraceae down to the tribe) with indication of the degree of confidence I place in the circumscription and placement of each category above the subfamily, the best available estimates of the number of genera and species for each category, and the known indigenous distribution of each subfamily and family. Table V lists alphabetically the geographical abbreviations used in the synopsis. The extensive bibliography of recent literature should be helpful to those persons interested in the classification of the flowering plants.
Author's H-index: 26