Asymmetric Cell Division in Plant Development

Plant embryogenesis creates a seedling with a basic body plan. Post-embryonically the seedling elaborates with a lifelong ability to develop new tissues and organs. As a result asymmetric cell divisions serve essential roles during embryonic and postembryonic development to generate cell diversity. This review highlights selective cases of asymmetric division in the model plant Arabidopsis thaliana and describes the current knowledge on fate determinants and mechanisms involved. Common themes that emerge are: 1. role of the plant hormone auxin and its polar transport machinery; 2. a MAP kinase signaling cascade and; 3. asymmetric segregating transcription factors that are involved in several asymmetric cell divisions

DEA performance assessment of mutual funds

The objectives of this paper are manyfold. First we present a comprehensive review of the literature of DEA models for the performance assessment of mutual funds. Then we discuss the problem of the presence of negative returns in DEA modeling for mutual funds and we identify a DEA model that is financially justified and tackles the issue of negative returns in a natural way. Moreover, we present an empirical application on real market data, considering different risk measures.\ud We consider also different holding periods, which include both a period of financial crisis and one of financial recovery. Moreover, we compare the results of the DEA performance measure with those obtained with traditional financial indicators