• PNAS Anthropology Portal
  • Science Sessions: The PNAS Podcast Program
June 30, 2009; 106 (26)

Cover image

Cover image expansion

Cover image: Molecular capsules self-assemble when the space inside is occupied by compounds with the appropriate size, shape, and chemical surface. Shown are dimeric calixpyrrole capsules held together by a cyclic seam of hydrogen bonds. The capsule recognizes bipyridine bis-N-oxide as an occupant that provides complementary polar functions: the N-oxides of the guest are hydrogen bonded to the NH array of the tetrapyrrole host. See the article by Pablo Ballester and Guzmáan Gil-Ramírez on pages 10455–10459. The introduction to the Molecular Recognition and Self-Assembly Special Feature is on pages 10423–10424. Image by Guzmán Gil-Ramirez.

Online Impact

  • 864971864 2018-01-22
  • 258841863 2018-01-22
  • 957295862 2018-01-22
  • 553518861 2018-01-22
  • 983792860 2018-01-22
  • 539694859 2018-01-22
  • 956115858 2018-01-22
  • 730379857 2018-01-22
  • 346624856 2018-01-22
  • 201609855 2018-01-22
  • 72549854 2018-01-21
  • 795928853 2018-01-21
  • 752345852 2018-01-21
  • 566508851 2018-01-21
  • 615722850 2018-01-21
  • 689612849 2018-01-21
  • 846903848 2018-01-21
  • 674896847 2018-01-21
  • 11197846 2018-01-21
  • 986896845 2018-01-21