1. Ion pair absorption of ionized drugs —fact or fiction ?

   • J. H. G. Jonkman
   • C. A. Hunt

   Review Articles Pages: 41 - 48

2. The effect of the molecular structure of closely related N₁-substituents of sulfonamides on the pathways of elimination in man

   • T. B. Vree
   • Y. A. Hekster
   • E. F. S. Termond

   Original Articles Pages: 49 - 56

3. Formulation of a stable vidarabine infusion fluid

   • L. M. L. Stolk
   • W. Huisman
   • A. Vyth

   Original Articles Pages: 57 - 60

4. Novel techniques for determination of antibacterial activity of silver sulfanilamides

   • J. J. M. Van Saene
   • A. Bult
   • C. F. Lerk

   Original Articles Pages: 61 - 64

5. In vitro testing of controlled release theophylline preparations: Theolair ®, Theograd® and Theolin®

   • J. P. Crombeen
   • C. J. De Blaey

   Original Articles Pages: 65 - 69

6. Determination of phenol in the presence of resorcinol applying substitution with excess bromine water; structure of the bromination products

   • S. M. Dreijer Van Der Glas
   • T. Schalekamp
   • A. Bult

   Short Communications Pages: 70 - 73

7. Comparison of lung deposition of a solution after nebulization by three commonly used portable nebulizers

   • R. A. Foulds
   • L. O. M. J. Smithuis

   Short Communications Pages: 74 - 76

8. Distinction between the tautomeric forms of sulfanilamide derivatives by¹³C- NMR

   • A. Bult

   Short Communications Pages: 77 - 78

9. Abstracts of Dutch Ph.D. theses

   • W. B. J. Mens

   Abstract Pages: 79 - 80