This article develops a co-citation analysis covering the period 1991–2014 outlining the collective logic of authors conducting studies of entrepreneurship education. The core themes, major contributions and topological features characterising their relationships are identified. The findings indicate that the field has a polycentric structure with five core themes of which entrepreneurial intentions emerges as the most influential while the entrepreneurial learning and evaluation themes have emerged in recent years. These two core themes appear to foster changes within the current structure with the introduction of new theoretical inputs and the formation of new theoretical hubs. We argue that future research should attempt to organise focal themes into a theoretical framework that allows a comprehensive picture of entrepreneurship education

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Photosystem II has been purified from a transplastomic strain of Nicotiana tabacum according to two different protocols. Using the procedure described in Piano et al. (Photosynth Res 106:221–226, 2010) it was possible to isolate highly active PSII composed of monomers and dimers but depleted in their PsbS protein content. A “milder” procedure than the protocol reported by Fey et al. (Biochim Biophys Acta 1777:1501–1509, 2008) led to almost exclusively monomeric PSII complexes which in part still bind the PsbS protein. This finding might support a role for PSII monomers in higher plants.