TRACER TECHNIQUES FOR THE STUDY OF HOST-PARASITE RELATIONS. Autoradiographic techniques have been used to study the interaction of many facultative and obligate parasites, including viruses. After feeding the host plant with labelled substrates, labelled material accumulates in the infected cells and seems to penetrate into structures of the parasite. After labelling the parasite, its influence...

It was found that DNP (2,4-dinitrophenol) will inhibit completely the propagation of influenza virus in chorioallantoic membrane. This reagent did not permanently alter those metabolic processes required for the synthesis of virus and at the concentrations employed demonstrated no virucidal effects. In minced preparations of chorioallantoic membrane DNP was shown to have a pronounced stimulator...

The topography associated with the fundamental crustal dichotomy in much of eastern Mars can be largely ascribed to a single event: the very large impact which produced the Utopia Basin. Subsequent internal and surficial processes have been unable to remove the topographic signature of this basin. In particular, endogenic processes appear to have been ineffective in contributing to the basic di...

This paper challenges Alasdair MacIntyre's assertion that the modern firm such as Google, Unilever, or Microsoft is inimical to human flourishing within an Aristotelian framework. The paper begins by questioning MacIntyre's rendering ofutopian communities. It then addresses four specific criticisms ofthe modern firm to be found throughout MacIntyre's oeuvre, namely compartmentalisation, myopia,...

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