Rostrum size differences between Toarcian belemnite battlefields

Toarcian oceanic anoxic event: An assessment of global causes using belemnite C isotope records

[1] Two hypotheses have been proposed to explain simultaneous large negative excursions (up to 7% PeeDee belemnite) in bulk carbonate (dCcarb) and organic carbon isotope records (d Corg) from black shales marking the Toarcian oceanic anoxic event (T-OAE). The first explanation envisions recycling of dissolved inorganic carbon (DIC) with a light isotopic signature into the photic zone from the l...

Battlefields That See

This talk will introduce two new applications of automated video analysis being pursued by DARPA. Video Verification of Identity (VIVID) is concerned with automatically tracking moving vehicles from a moving aircraft and searching the surrounding area for others who may be nearby. Combat Zones That See (CTS) is coordinating the analysis of large numbers of fixed cameras to identify and track ve...

New battlefields for costimulation

Costimulation regulates the activation of naive T cells as they first encounter antigens in the secondary lymphoid organs. But recently characterized costimulatory molecules of the B7 family appear to have roles beyond initial T cell activation. New evidence shows that negative costimulators expressed by tumors and normal tissues afford local protection from T cell-mediated attack.

The effect of shell secretion rate on Mg / Ca and Sr / Ca ratios in biogenic calcite as observed in a belemnite rostrum

Isotopic ratios and concentrations of the alkaline earth metals Mg and Sr in biogenic calcite are of great importance as proxies for environmental parameters. In particular, the Mg /Ca ratio as a temperature proxy has had considerable success. It is often hard to determine, however, which parameter ultimately controls the concentration of these elements in calcite. Here, multiple Mg /Ca and Sr ...

Sexuality: Size and Sex Differences