28 Works

Direct observation of hyperpolarization breaking through the spin diffusion barrier

Quentin Stern, Samuel F. Cousin, Frederic Mentink-Vigier, Arthur C. Pinon, Stuart J. Elliott, Olivier Cala & Sami Jannin
Dynamic nuclear polarization (DNP) is a widely used tool for overcoming the low intrinsic sensitivity of nuclear magnetic resonance spectroscopy and imaging. Its practical applicability is typically bounded, however, by the so-called ‘spin diffusion barrier’, which relates to the poor efficiency of polarization transfer from highly polarized nuclei close to paramagnetic centers to bulk nuclei. A quantitative assessment of this barrier has been hindered so far by the lack of general methods for studying nuclear-polarization...

Niche differences in co-occurring cryptic coral species (Pocillopora spp.)

Erika Johnston, Alex Wyatt, James Leichter & Scott Burgess
Cryptic species that are morphologically similar co-occur because either the rate of competitive exclusion is very slow, or because they are not, in fact, ecologically similar. The processes that maintain cryptic local diversity may, therefore, be particularly subtle and difficult to identify. Here, we uncover differences among several cryptic species in their relative abundance across a depth gradient within a dominant and ecologically important genus of hard coral, Pocillopora. From extensive sampling unbiased towards morphological...

A comparative study between outcomes of an in-person vs. online introductory field course

Alexandra Race, Maria De Jesus, Roxanne Beltran & Erika Zavaleta
The COVID-19 pandemic has disrupted many standard approaches to STEM education. Particularly impacted were field courses, which rely on specific natural spaces often accessed through shared vehicles. As in-person field courses have been found to be particularly impactful for undergraduate student success in the sciences, we aimed to compare and understand what factors may have been lost or gained during the conversion of an introductory field course to an online format. Using a mixed methods...

Registration Year

  • 2021

Resource Types

  • Dataset


  • Florida State University
  • Clemson University
  • University of Michigan-Ann Arbor
  • The Hong Kong University of Science and Technology
  • University of Gothenburg
  • University of Toronto
  • University of California, Riverside
  • University of Oxford
  • University of West Florida
  • South African National Biodiversity Institute