This continuing series gathers and presents original research results on the leading edge of medicine and biology. Each article has been carefully selected in an attempt to present substantial topical data across a broad spectrum. Topics discussed in this compilation include serum ascorbic acid levels in selected surgical diseases; liver transplantation and therapy; background of orthodontic treatment; infectious complications in pregnancy; assessment of child dietary intake and the role of endothelin in regulating neutrophil recruitment to the lungs.