Robert Ruprecht

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Resistance to methotrexate was induced in bone marrow cells of mice by transformation in vitro with DNA from a drug-resistant cell line. Transformed cells were injected in vivo and haematopoietic cells expressing resistance were selected by drug treatment of recipients. Transformed cells had elevated levels of dihydrofolate reductase and demonstrated a(More)
maSS tranSportation haS grown over the past few decades. Commuting by public transport is a phenomenon that seems to be spreading daily. In this context of travel, information has improved a lot. While there are fewer people physically present to produce information for lost travelers , there is much more information provided—even on bus stops and inside(More)
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