Measuring the Stable Isotope Composition of Water in Brine from Halite Fluid Inclusions and Borehole Brine Seeps Using Cavity Ring-Down Spectroscopy.

Naturally occurring bedded salt deposits are considered robust for the permanent disposal of heat-generating nuclear waste due to their unique physical and geological properties. The Brine Availability Test in Salt (BATS) is a US-DOE Office of Nuclear Energy funded project that uses heated borehole experiments underground (∼655 meters depth) at the Waste Isolation Pilot Plant (WIPP) in the bedded salt deposits of the Salado Formation to investigate the capacity for safe disposal of high-level, heat generating nuclear waste in salt. Uncertainties associated with brine mobility near heat-generating waste motivates the need to characterize the processes and sources of brine in salt deposits.

Dung predicts the global distribution of herbivore grazing pressure in drylands.

Dryland grazing sustains millions of people worldwide but, when poorly managed, threatens food security. Here we combine livestock and wild herbivore dung mass data from surveys at 760 dryland sites worldwide, representing independent measurements of herbivory, to generate high-resolution maps. We show that livestock and wild herbivore grazing is globally disconnected, and identify hotspots of herbivore activity across Africa, the Eurasian grasslands, India, Australia and the United States.

Publication of Medical Student Summer Research: A Multi-institutional Analysis.

Objective: Summer research programs can support medical students' exposure to research and scholarly activity, and strengthen their applications for residency positions, particularly if students are able to generate peer-reviewed publications resulting from their summer experience. We aimed to estimate the rate of publication among medical student summer projects and identify any predictors of projects' progress to publication.

Methods: Projects were identified from abstract books published by five medical schools' summer research programs for rising second-year medical students.

Rapid low-level nitrate determination by UV spectroscopy in the presence of competing ions.

The presence of excessive nitrate in environmental and drinking water even at low levels can pose both environmental and health hazards. Because of this, various methods for its removal have been investigated. Essential to conducting such research is a method to reliably quantify nitrate in relevant matrices.