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排序方式: 共有192条查询结果,搜索用时 15 毫秒
181.
Catia Amancio Almeida Galba Maria de Campos-Takaki Maristela Barbosa Portela Luiz R Travassos Celuta Sales Alviano Daniela Sales Alviano 《Mycopathologia》2013,176(3-4):183-189
The possible role of sialic acids in host cells–fungi interaction and their association with glycoproteins were evaluated using a clinical isolate of the dimorphic fungus Mucor polymorphosporus. Lectin-binding assays with spores and yeast cells denoted the presence of surface sialoglycoconjugates containing 2,3- and 2,6-linked sialylglycosyl groups. Western blotting with peroxidase-labeled Limulus polyphemus agglutinin revealed the occurrence of different sialoglycoprotein types in both cell lysates and cell wall protein extracts of mycelia, spores, and yeasts of M. polymorphosporus. Sialic acids contributed to the surface negative charge of spores and yeast forms as evaluated by adherence to a cationic substrate. Sialidase-treated spores were less resistant to phagocytosis by human neutrophils and monocytes from healthy individuals than control (untreated) fungal suspensions. The results suggest that sialic acids are terminal units of various glycoproteins of M. polymorphosporus, contributing to negative charge of yeasts and spore cells and protecting infectious propagules from destruction by host cells. 相似文献
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A. Paige Adams Roberto Navarro-Lopez Francisco J. Ramirez-Aguilar Irene Lopez-Gonzalez Grace Leal Jose M. Flores-Mayorga Amelia P. A. Travassos da Rosa Kali D. Saxton-Shaw Amber J. Singh Erin M. Borland Ann M. Powers Robert B. Tesh Scott C. Weaver Jose G. Estrada-Franco 《PLoS neglected tropical diseases》2012,6(11)
185.
The complete mitochondrial DNA sequence of the shark Mustelus manazo: evaluating rooting contradictions to living bony vertebrates 总被引:5,自引:0,他引:5
A remarkable example of a misleading mitochondrial protein tree is
presented, involving ray-finned fishes, coelacanths, lungfishes, and
tetrapods, with sea lampreys as an outgroup. In previous molecular
phylogenetic studies on the origin of tetrapods, ray-finned fishes have
been assumed as an outgroup to the tetrapod/lungfish/coelacanth clade, an
assumption supported by morphological evidence. Standard methods of
molecular phylogenetics applied to the protein-encoding genes of
mitochondria, however, give a bizarre tree in which lamprey groups with
lungfish and, therefore, ray-finned fishes are not the outgroup to a
tetrapod/lungfish/coelacanth clade. All of the dozens of published
phylogenetic methods, including every possible modification to maximum
likelihood known to us (such as inclusion of site heterogeneity and
exclusion of potentially misleading hydrophobic amino acids), fail to place
the ray-finned fishes in a biologically acceptable position. A likely cause
of this failure may be the use of an inappropriate outgroup. Accordingly,
we have determined the complete mitochondrial DNA sequence from the shark,
Mustelus manazo, which we have used as an alternative and more proximal
outgroup than the lamprey. Using sharks as the outgroup, lungfish appear to
be the closest living relative of tetrapods, although the possibility of a
lungfish/coelacanth clade being the sister group of tetrapods cannot be
excluded.
相似文献
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J.O. Previato L. Mendonça-Previato R.Z. Lewanczuk L.R. Travassos P.A.J. Gorin 《Experimental parasitology》1982,53(2):170-178
The chemical structures of polysaccharide components of cells of several Crithidia species have been partially elucidated. The structures have been used as criteria to evaluate evolutionary lines previously proposed for species of Crithidia and Herpetomonas and for Trypanosoma cruzi. In accord with the suggestion that Crithidia and Herpetomonas are closely interrelated, all species investigated synthesize a linear (1→2)-linked β-d-mannopyranan and a heteropolysaccharide. These differ from T. cruzi polysaccharide, which contains α-d-mannopyranosyl structures and likely indicates a separate evolutionary route for this flagellate. Crithidia fasciculata, Crithidia harmosae, and Crithidia luciliae form a closely knit group since they form arabinogalactans with related structures. The similarity is particularly close between arabinogalactans of C. fasciculata and C. harmosae whose 13C nuclear magnetic resonance spectra show a high degree of resemblance. An unnamed Crithidia sp. contains polysaccharides with fucose and xylose units, intermediate between those of Crithidia deanei, which gave glucose and fucose on hydrolysis, and Herpetomnas samuelpessoai, which gave glucuronic acid and xylose. 相似文献
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Celuta S. Alviano Sonia R. Farbiarz Luiz R. Travassos Jayme Angluster Wanderley de Souza 《Mycopathologia》1992,119(1):17-23
The influence of growth conditions, as well as of propranolol on Fonsecaea pedrosoi morphogenesis was established using the chemically defined media of Czapeck-Dox (CD) and Butterfield (BF). Mycelial growth of F. pedrosoi in both media was obtained at room temperature (25 °C) for 14 days, without shaking, whereas conidia formed at 37 °C, for 4 days, in shaken cultures and could be isolated free from the mycelium by filtration in gauze. At low pH (2.5–3.0), there appeared sclerotic cells attached to normal hyphae. When propranolol was added to the CD medium moniliform hyphae were observed, whereas this drug in the BF medium induced formation of sclerotic cells. Ultrastructural examination revealed that the propranolol-induced sclerotic cells were very similar to those observed in infected tissues. 相似文献
190.