This paper has been prepared for a chapter in the Handbook of Labor Economics Volume IV edited by David Card and Orley Ashenfelter. We would like to thank the Economic and Social Research Council for their financial support through the Center for Economic Performance. This survey draws substantially on joint work with Daron Acemoglu, Philippe Aghion, Eve Caroli, Luis Garicano, Christos Genakos,...

Congenital hepatic fibrosis (CHF) is a rare, autosomal recessive disorder, clinically characterized by hepatic fibrosis and portal hypertension. CHF results from ductal plate malformation (DPM) of the intrahepatic bile ducts. Four clinical forms can be observed: portal hypertensive, cholangitic, mixed and latent. CHF is one of the "fibropolycystic diseases" which also include several conditions...

Three new taxa, endemic of Sardinia, are described in the genus Asida Latreille, 1802: Asida (Asida) dryas sp. nov. (type locality: Capoterra, Gutturu Mannu), A. (Asida) anachoreta sp. nov. (type locality: Gonnosfanadiga, Punta Cammedda), and A. (Asida) solieri caroli ssp. nov. (type locality: Morgongiori, Is Benas). Additional systematic, distributional and ecological data are provided for som...

This study was undertaken in order to determine whether proinflammatory cytokines are involved in a previously described protection against Klebsiella infection mediated by antilipopolysaccharide antibodies. BALB/c mice were infected intraperitoneally with a lethal challenge of Klebsiella pneumoniae Caroli. One group of mice was protected with monoclonal antibodies against lipopolysaccharide pr...