Bloodmeal hosts of Anopheles species (Diptera: Culicidae) in a malaria-endemic area of the Brazilian Amazon.
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):947-56.Bloodmeal hosts of Anopheles species (Diptera: Culicidae) in a malaria-endemic area of the Brazilian Amazon.1, , , , .1Florida Medical Entomology Laboratory, University of Florida/ IFAS, 200 9th St. SE, Vero Beach, FL 32962, USA.AbstractHosts of blood-fed anophelines (Diptera: Culicidae) were determined in three riverine villages, 1.5-7.0 km apart, along the Matapí River, Amapá state, Brazil, by enzyme-linked immunosorbent assay midgut analysis for IgG of common vertebrates. Anopheles marajoara Galv?o & Damsceno and Anopheles darlingi Root had higher human blood indices (HBI) than Anopheles nuneztovari Gabaldón, Anopheles triannulatus (Neiva and Pinto), and Anopheles intermedius (Chagas), which were relatively zoophilic. HBIs of An. darlingi varied significantly among villages, attributable to a low proportion of human-fed mosquitoes in Santo Ant?nio. Significantly higher incidence of An. marajoara and An. nuneztovari fed on pig blood at two villages, associated with a low number of pigs in Santo Ant?nio. The incidences of bovine blood varied significantly among villages for all three of the most common anopheline species. The incidence of mixed meals ranged from 7.1 to 27.6% among common species, and, for An. marajoara, varied significantly among villages. This study demonstrates differences in host selection patterns among villages only a few kilometers apart, which may be influenced by host availability and have important epidemiological consequences.PMID:
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External link. Please review our .Purification and characterization of adult diarrhea rotavirus: identification of viral structural proteins.
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):2191-7.Purification and characterization of adult diarrhea rotavirus: identification of viral structural proteins.1, , , , , , , , , , et al.1Viral Gastroenteritis Unit, Centers for Disease Control, Atlanta, Georgia 30333.AbstractAdult diarrhea rotavirus (ADRV) is a newly identified strain of noncultivable human group B rotavirus that has been epidemic in the People's Republic of China since 1982. We have used sodium dodecyl sulfate-polyacrylamide gel electrophoresis and Western (immuno-) blot analysis to examine the viral proteins present in the outer and inner capsids of ADRV and compared these with the proteins of a group A rotavirus, SA11. EDTA treatment of double-shelled virions removed the outer capsid and resulted in the loss of three polypeptides of 64, 61, and 41, kilodaltons (kDa). Endo-beta-N-acetylglucosaminidase H digestion of double-shelled virions identified the 41-kDa polypeptide as a glycoprotein. CaCl2 treatment of single-shelled particles removed the inner capsid and resulted in the loss of one polypeptide with a molecular mass of 47 kDa. The remaining core particle had two major structural proteins of 136 and 113 kDa. All of the proteins visualized on sodium dodecyl sulfate-polyacrylamide gel electrophoresis were antigenic by Western blot analysis when probed with convalescent-phase human and animal antisera. A 47-kDa polypeptide was most abundant and was strongly immunoreactive with human sera, animal sera raised against ADRV and against other group B animal rotaviruses (infectious diarrhea of infant rat virus, bovine and porcine group B rotavirus, and bovine enteric syncytial virus) and a monoclonal antibody prepared against infectious diarrhea of infant rat virus. This 47-kDa inner capsid polypeptide contains a common group B antigen and is similar to the VP6 of the group A rotaviruses. Human convalescent-phase sera also responded to a 41-kDa polypeptide of the outer capsid that seems similar to the VP7 of group A rotavirus. Other polypeptides have been given tentative designations on the basis of similarities to the control preparation of SA11, including a 136-kDa polypeptide designated VP1, a 113-kDa polypeptide designated VP2, 64- and 61-kDa polypeptides designated VP5 and VP5a, and several proteins in the 110- to 72-kDa range that may be VP3, VP4, or related proteins. The lack of cross-reactivity on Western blots between antisera to group A versus group B rotaviruses confirmed that these viruses are antigenically quite distinct.PMID:
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External link. Please review our .Preheating with nonminimal kinetic terms.
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2013 Aug 2;111(5):051301. Epub
2013 Jul 29.Preheating with nonminimal kinetic terms.1, , , .1Department of Physics, Kenyon College, Gambier, Ohio 43022, USA.AbstractWe present the first (3+1)-dimensional numerical simulations of scalar fields with nonminimal kinetic terms. As an example, we examine the existence and stability of preheating in the presence of a Dirac-Born-Infeld inflaton coupled to a canonical matter field. The simulations represent the full nonlinear theory in the presence of an expanding universe. We show that parametric resonance in the matter field along with self-resonance in the inflaton repopulate the universe with matter particles as efficiently as in traditional preheating. PMID:
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External link. Please review our .Sequential roles for Otx2 in visceral endoderm and neuroectoderm for forebrain and midbrain induction and specification.
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):845-56.Sequential roles for Otx2 in visceral endoderm and neuroectoderm for forebrain and midbrain induction and specification.1, , , , , .1Institut de Genetique et de Biologie Moleculaire et Cellulaire, CNRS/INSERM/Universite Louis Pasteur, Strasbourg, France.AbstractThe homeobox gene Otx2 is a mouse cognate of the Drosophila orthodenticle gene, which is required for development of the brain, rostral to rhombomere three. We have investigated the mechanisms involved in this neural function and specifically the requirement for Otx2 in the visceral endoderm and the neuroectoderm using chimeric analysis in mice and explant recombination assay. Analyses of chimeric embryos composed of more than 90% of Otx2-/- ES cells identified an essential function for Otx2 in the visceral endoderm for induction of the forebrain and midbrain. The chimeric studies also demonstrated that an anterior neural plate can form without expressing Otx2. However, in the absence of Otx2, expression of important regulatory genes, such as Hesx1/Rpx, Six3, Pax2, Wnt1 and En, fail to be initiated or maintained in the neural plate. Using explant-recombination assay, we could further demonstrate that Otx2 is required in the neuroectodem for expression of En. Altogether, these results demonstrate that Otx2 is first required in the visceral endoderm for the induction, and subsequently in the neuroectoderm for the specification of forebrain and midbrain territories.PMID:
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