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The human parvovirus B19 causes aplastic crises in sickle cell anemia patients and the disease erythema infectiosum. So far, it has not been possible to grow B19 virus in cultured cells. Here we report the use of in vitro transcription in HeLa cell extract ...
In this paper, we prove that if f is a conformal map between two Riemannian surfaces, and if the curvature of the target is nonpositive and less than or equal to the curvature of the source, then the map is contracting. ...
