DNA double‐strand breaks (DSBs) are one of the most deleterious forms of DNA damage and can result in cell inviability or chromosomal aberrations. The Mre11‐Rad50‐Nbs1 (MRN) ATPase‐nuclease complex is a central player in the cellular response to DSBs and is implicated in the sensing and nucleolytic processing of DSBs, as well as in DSB signaling by activating the cell cycle checkpoint kinase ATM. ATP binding to Rad50 switches MRN from an open state with exposed Mre11 nuclease sites to a closed (...) state with partially buried nuclease sites. The functional meaning of this switch remained unclear. A new study shows that ATP binding to Rad50 promotes DSB recognition, tethering, and ATM activation, while ATP hydrolysis opens the nuclease active sites to promote processing of DSBs. MRN thus emerges as functional switch that may coordinate the temporal transition from signaling to processing of DSBs. (shrink)

The present note is a reworking and streamlining of Daigneault and Monk's Representation Theory for Polyadic Algebras. MSC: 03G15.

A theorem on the extendability of certain subsets of a Boolean algebra to ultrafilters which preserve countably many infinite meets (generalizing Rasiowa-Sikorski) is used to pinpoint the mechanism of the Barwise proof in a way which bypasses the set theoretical elaborations.

Global health conceives the notion of partnership between North and South as central to the foundations of this academic field. Indeed, global health aspires to an equal positioning of Northern and Southern actors. While the notion of partnership may be used to position the field of global health morally, this politicization may mask persisting inequalities in global health. In this paper, we reflect on global health partnerships by revisiting the origins of global health and deconstructing the notion of partnership. We (...) also review promising initiatives that may help to rebalance the relationship. Historical accounts are helpful in unpacking the genesis of collaborative research between Northerners and Southerners – particularly those coming from the African continent. In the 1980s, the creation of a scientific hub of working relationships based on material differences created a context that was bound to create tensions between the alleged “partners”. Today, partnerships provide assistance to underfunded African research institutions, but this assistance is often tied with hypotheses about program priorities that Northern funders require from their Southern collaborators. African researchers are often unable to lead or contribute substantially to publications for lack of scientific writing skills, for instance. Conversely, academics from African countries report frustrations at not being consulted when the main conceptual issues of a research project are discussed. However, in the name of political correctness, these frustrations are not spoken aloud. Fortunately, initiatives that shift paternalistic programs to formally incorporate a mutually beneficial design at their inception with equal input from all stakeholders are becoming increasingly prominent, especially initiatives involving young researchers. Several concrete steps can be undertaken to rethink partnerships. This goes hand in hand with reconceptualizing global health as an academic discipline, mainly through being explicit about past and present inequalities between Northern and Southern universities that this discipline has thus far eluded. Authentic and transformative partnerships are vital to overcome the one-sided nature of many partnerships that can provide a breeding-ground for inequality. (shrink)

INTRODUCTORY* Teleology, ok Moeal Causation. 1. Man aim 8 Before studying the laws which gov- at Fruition — ie, ern human actions, it is useful, ...