Front Matter

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• Inner Workings: Combating antibiotic resistance from the ground up
  Researchers are attempting to use adjuvants to enhance the potency of existing antimicrobials. Image courtesy of Andrew King.

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• News Feature: To master memory, researchers pursue its roots
  Novel approaches have reinvigorated the search for the elusive memory engram—and energized attempts to control it. Image courtesy of Dave Cutler.

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• Science and Culture: Petri palettes create microbial masterpieces
  Artist-researcher collaborations are creating living works of art to explore new aesthetics and debunk microbe myths. Artwork by Md Zohorul Islam (University of Copenhagen, Copenhagen). Image courtesy of American Society for Microbiology.

PNAS in the News

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• Physicians’ political views and patient care
  A study suggests that patient care can vary based on physicians’ political views.
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• Frog population recovery in the Sierra Nevada
  The endangered Sierra Nevada yellow-legged frog (Rana sierrae) has increased in abundance in Yosemite National Park, California, according to a study.
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• Sound-meaning associations in language
  Based on an analysis of nearly two-thirds of the world’s languages, researchers report statistical associations between sounds and word meanings, such as ”n” with words for “nose” and “r” with “round,” which are common across otherwise unrelated languages, suggesting that the relationship between sound and meaning in human languages might not be entirely arbitrary.
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