منابع مشابه
Guns, germs and dogs: On the origin of Leishmania chagasi.
The evolutionary history of Leishmania chagasi, the aetiological agent of visceral leishmaniasis in South America has been widely debated. This study addresses the problem of the origin of L. chagasi, its timing and demography with fast evolving genetic markers, a suite of Bayesian clustering algorithms and coalescent modelling. Here, using 14 microsatellite markers, 450 strains from the Leishm...
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The sudden appearance of chytridiomycosis, the cause of amphibian deaths and population declines in several continents, suggests that its etiologic agent, the amphibian chytrid Batrachochytrium dendrobatidis, was introduced into the affected regions. However, the origin of this virulent pathogen is unknown. A survey was conducted of 697 archived specimens of 3 species of Xenopus collected from ...
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A heterogenetic antibody showing fixation of complement with human liver and agglutination of sheep erythrocytes was found in certain cases of acute infective hepatitis. The antigen concerned in these reactions was apparently heat stable and alcohol soluble. Differences from other heterogenetic antigen-antibody systems have been noted. The possible relation of the heterogenetic antibody to live...
متن کاملThe origin of Ceratocystis fagacearum, the oak wilt fungus.
The oak wilt pathogen, Ceratocystis fagacearum, may be another example of a damaging, exotic species in forest ecosystems in the United States. Though C. fagacearum has received much research attention, the origin of the fungus is unknown. The pathogen may have been endemic at a low incidence until increased disturbances, changes in land use, and forest management created conditions favorable f...
متن کاملHolomorphic Germs and the Problem of Smooth Conjugacy in a Punctured Neighborhood of the Origin
We consider germs of conformal mappings tangent to the identity at the origin in C. We construct a germ of a homeomorphism which is a C∞ diffeomorphism except at the origin conjugating these holomorphic germs with the time-one map of the vector field V (z) = zm ∂ ∂z . We then show that, in the case m = 2, for a germ of a homeomorphism which is real-analytic in a punctured neighborhood of the or...
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ژورنال
عنوان ژورنال: Nature
سال: 1905
ISSN: 0028-0836,1476-4687
DOI: 10.1038/071272b0