pH and calcium change in the microenvironment of a benthic foraminifer (Ammonia sp.) and its size during experiments

Calcareous foraminifera are well known for their CaCO3 shells. Yet, CaCO3 precipitation acidifies the calcifying fluid. Calcification without pH regulation would therefore rapidly create a negative feedback for CaCO3 precipitation. In unicellular organisms, like foraminifera, an effective mechanism to counteract this acidification could be the externalization of H+ from the site of calcification. In this study we show that a benthic symbiont-free foraminifer Ammonia sp. actively decreases pH within its extracellular microenvironment only while precipitating calcite. During chamber formation events the strongest pH decreases occurred in the vicinity of a newly forming chamber (range of gradient about 100 µm) with a recorded minimum of 6.31 (< 10 µm from the shell) and a maximum duration of 7 h. The acidification was actively regulated by the foraminifera and correlated with shell diameters, indicating that the amount of protons removed during calcification is directly related to the volume of calcite precipitated. The here presented findings imply that H+ expulsion as a result of calcification may be a wider strategy for maintaining pH homeostasis in unicellular calcifying organisms.

Cittadinanza, lavoro e diritti sociali nella crisi europea = Citizenship, work and social rights in the European crisis. WP C.S.D.L.E. “Massimo D’Antona”.INT – 100/2013

This paper explores the limits and potentials of European citizenship as a transnational form of social integration, taking as comparison Marshall's classical analysis of the historical development of social rights in the context of the national Welfare State. It is submitted that this potential is currently frustrated by the prevailing negative-integration dimension in which the interplay between Union citizenship and national systems of Welfare State takes place. This negative dimension pervades the entire case law of the Court of Justice on Union citizenship, even becoming dominant – after the famous Viking and Laval judgements – in the ways in which the judges in Luxembourg have built, and limited, what in Marshall’s terms might be called the European collective dimension of “industrial citizenship”. The new architecture of the economic and monetary governance of the Union, based as it is on an unprecedented effort towards a creeping constitutionalisation of a neo-liberal politics of austerity and welfare retrenchment, is destined to strengthen the de-structuring pressures on the industrial-relation and social protection systems of the member States. The conclusions sum-up the main critical arguments and make some suggestions for an alternative path for re-politicising the social question in Europe.

Fair Access to Energy Resources, Market Transfers and Climate Change in the WTO

This paper addresses the issues of dual pricing and export restrictions in the energy sector, stressing the comparability of their economic and climate change impacts. It assesses whether WTO disciplines relevant and applicable to such practices are well-equipped to ensure fair access to energy resources. It finds that relevant GATT disciplines are overall deficient in the case of dual pricing and export taxes, while the landscape of WTO-plus obligations generally consisting of a network of narrowly tailored commitments. It discusses possible avenues to address such practices under the ASCM to the extent that they distort domestic energy prices and subsidize consumption of cheap fossil fuels

A Year book of the church and social service in the United States.

Includes bibliographies.