Publications by authors named "M J DARRACH"

Article Synopsis
  • Delimiting species boundaries is a complex issue in systematics, especially when dealing with subtle morphological variations that can arise from environmental influences or speciation.
  • The Lomatium foeniculaceum species complex, widespread in the western U.S. and Canada, has traditionally been classified into five subspecies, but genetic analysis suggests these may be distinct clades.
  • Using molecular data from the Angiosperm353 baits kit, the study identified six monophyletic clades and highlights the need for a reevaluation of taxonomic ranks based on both genetic and morphological traits.
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Objectives: Indigenous peoples are the first peoples of what is now called Canada. Canadians have benefitted from their largesse and contributions in a myriad of ways that remain unacknowledged. Indeed, ongoing colonization and systemic anti-Indigenous racism in all quarters of our society have had heinous impacts on their health and well-being.

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Objective: The Intergovernmental Panel on Climate Change recently issued a statement that the fate of human society and human health is at serious risk of catastrophic impacts unless we take bold action to keep global warming under 1.5 °C. In 2015, the Canadian Public Health Association noted emerging efforts to embrace intersectoral approaches to global change in public health research and practice.

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A new technique that has applications for the detection of nonvolatile organics on Ocean Worlds has been developed. Here, liquid mixtures of fatty acids (FAs) and/or amino acids (AAs) are introduced directly into a miniature quadrupole ion trap mass spectrometer (QITMS) developed at Jet Propulsion Laboratory and analyzed. Two ionization methods, electron impact and chemical ionization (EI and CI, respectively), are compared and contrasted.

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We present the multi-particle simulation program suite Computational Ion Trap Analyzer (CITA) designed to calculate the ion trajectories within a Paul quadrupole ion trap developed by the Jet Propulsion Laboratory (JPL). CITA uses an analytical expression of the electrodynamic field, employing up to six terms in multipole expansion and a modified velocity-Verlet method to numerically calculate ion trajectories. The computer code is multithreaded and designed to run on shared-memory architectures.

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