Spirochetes Bacteria
Mostrando 1-12 de 86 artigos, teses e dissertações.
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1. Passage of Borrelia burgdorferi through diverse Ixodid hard ticks causes distinct diseases: Lyme borreliosis and Baggio-Yoshinari syndrome
Baggio-Yoshinari syndrome is an emerging, tick-borne, infectious disease recently discovered in Brazil. This syndrome is similar to Lyme disease, which is common in the United States of America, Europe and Asia; however, Brazilian borreliosis diverges from the disease observed in the Northern Hemisphere in its epidemiological, microbiological, laboratory and
Clinics. Publicado em: 14/11/2018
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2. Fluorescent membrane markers elucidate the association of Borrelia burgdorferi with tick cell lines
This study aimed to describe the association of Borrelia burgdorferi s.s. with ixodid tick cell lines by flow cytometry and fluorescence and confocal microscopy. Spirochetes were stained with a fluorescent membrane marker (PKH67 or PKH26), inoculated into 8 different tick cell lines and incubated at 30°C for 24 h. PKH efficiently stained B. burgdorferi with
Braz J Med Biol Res. Publicado em: 20/06/2016
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3. Caracterizações biológicas das proteínas LipL32 e HlyX de Leptospira interrogans sorovar Copenhageni. / Biology characterizations of LipL32 and HlyX proteins of Leptospira interrogans sorovar Copenhageni.
Leptospirosis, a spirochaetal zoonotic disease caused by Leptospira, has been recognized as na important emerging infectious disease. LipL32 is a surface lipoprotein which is highly conserved among pathogenic Leptospira species and is also expressed at high levels either during cultivation and natural infection. Regarding HlyX, it has been annotated as a pro
Publicado em: 2009
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4. Description of Lyme disease-like syndrome in Brazil: is it a new tick borne disease or Lyme disease variation?
An emerging clinical entity that reproduces clinical manifestations similar to those observed in Lyme disease (LD) has been recently under discussion in Brazil. Due to etiological and laboratory particularities it is named LD-like syndrome or LD imitator syndrome. The condition is considered to be a zoonosis transmitted by ticks of the genus Amblyomma, possi
Brazilian Journal of Medical and Biological Research. Publicado em: 01/03/2007
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5. Murine Model for Lymphocytic Tropism by Borrelia burgdorferi
In vitro studies have demonstrated direct interactions between Borrelia burgdorferi and human B and T cells. However, largely because disseminated infections typically occur at very low density, little is known about associations between spirochetes and mammalian host cells in vivo. To assess whether spirochetes interact directly with lymphocytes in mammals,
American Society for Microbiology.
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6. Purification and Characterization of Borrelia burgdorferi from Feeding Nymphal Ticks (Ixodes scapularis)
Here we describe a protocol for purifying Borrelia burgdorferi from feeding ticks by velocity centrifugation and Percoll density gradient centrifugation. The purified spirochetes were motile and 10- to 20-fold purer than the bacteria in crude tick homogenates. The purified bacteria were present in sufficient quantity for protein and gene expression studies.
American Society for Microbiology.
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7. Glycerol-3-Phosphate Acquisition in Spirochetes: Distribution and Biological Activity of Glycerophosphodiester Phosphodiesterase (GlpQ) among Borrelia Species
Relapsing-fever spirochetes achieve high cell densities (>108/ml) in their host's blood, while Lyme disease spirochetes do not (<105/ml). This striking contrast in pathogenicity of these two groups of bacteria suggests a fundamental difference in their ability to either exploit or survive in blood. Borrelia hermsii, a tick-borne relapsing-fever spirochete, c
American Society for Microbiology.
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8. Human intestinal spirochetes are distinct from Serpulina hyodysenteriae.
Twenty-nine intestinal spirochetes isolated from Australian aboriginal children and six strains from Italian adults (HRM1, -2, -4, -5, -7, and -14) were genetically examined at 15 enzyme loci by using multilocus enzyme electrophoresis. Results were compared with those previously obtained for 188 porcine intestinal spirochetes. DNA from human strain HRM7 and
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9. Carotenoid pigments of facultatively anaerobic spirochetes.
Carotenoid pigments were purified from a previously undescribed, red, halophilic spirochete (spirochete RS1), and from Spirochaeta aurantia strain J1. Both spirochetes are facultative anaerobes and produce pigments when growing aerobically. The major pigments of the two spirochetes were identified by means of chromatographic analysis, absorption spectroscopy
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10. Induction of an outer surface protein on Borrelia burgdorferi during tick feeding.
Lyme disease spirochetes, Borrelia burgdorferi sensu lato, are maintained in zoonotic cycles involving ticks and small mammals. In unfed ticks, the spirochetes produce one outer surface protein, OspA, but not OspC. During infection in mammals, immunological data suggest that the spirochetes have changed their surface, now expressing OspC but little or no Osp
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11. Composite, large spirochetes from microbial mats: spirochete structure review.
Phenomena previously unknown in free-living spirochetes are reported: large-sized cells with variable diameter (length to 100 microns, width between 0.4 and 3.0 microns), composite structure (smaller spirochetes inside larger ones), and positive phototropic behavior. These bacteria, Spirosymplokos, are compared with all other spirochete genera. The large spi
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12. Leptospira genomes are modified at 5'-GTAC.
Genomic DNAs of 14 strains from seven species of the spirochete Leptospira were resistant to cleavage by the restriction endonuclease RsaI (5'-GTAC). A modified base comigrating with m4C was detected by chromatography. Genomic DNAs from other spirochetes, Borrelia group VS461, and Serpulina strains were not resistant to RsaI digestion. Modification at 5'-GTA