We review some recent endeavors and add some new results to characterize and understand underlying mechanisms in Wikipedia (WP), the paradigmatic example of collaborative value production. We analyzed the statistics of editorial activity in different languages and observe typical circadian and weekly patterns, which enabled us to estimate the geographical origins of contributions to WPs in lang...

Measures devised to quantify production upstreamness and downstreamness in value chains have been introduced and used increasingly in recent years. While the constructs embodied in these measures are meaningful, this paper identifies an overlooked implementation problem. Specifically, the algorithms have been applied either as though the underlying data represent flows, or under the assumption ...

Article history: Received 8 March 2007 Received in revised form 14 October 2009 Accepted 20 October 2009 Available online xxxx JEL classification: D24 L63 L86

Increasing interest in recombinant protein technologies for human and animal health applications has spotlighted microalgae as a platform with the potential to meet a large impending demand. Here we describe an algae protein expression system and compare the advantages and disadvantages to other platforms currently operating on a commercial level. High-value recombinant proteins that have been ...

We present a new method of resummation of QCD threshold distributions to the hard scattering function of the dilepton production cross section in hadron-hadron collisions. Our formulation by-passes the infrared singularities of the QCD running coupling through a principal value prescription, and does not require an explicit infrared cut-off. The resulting large corrections exponentiate, and we ...