1. On the use of the separation number as a criterion for the evaluation of gas chromatography capillary columns in isothermal conditions

   • J. Krupcik
   • J. Garaj
   • J. M. Schmitter

   Originals Pages: 501 - 506

2. The determination of phenol in urine by enzymatic hydrolysis/headspace gas chromatography

   • E. R. Adlard
   • C. B. Milne
   • P. E. Tindle

   Originals Pages: 507 - 509

3. Retention of diphenyls, terphenyls, phenylalkanes and fluorene on graphitized thermal carbon black

   • E. V. Kalashnikova
   • A. V. Kiselev
   • S. D. Vasileva

   Originals Pages: 510 - 514

4. Temperature gradients in HPLC columns due to viscous heat dissipation

   • H. Poppe
   • J. C. Kraak
   • J. H. M. van den Berg

   Originals Pages: 515 - 523

5. Preparation and modification of complex pyrolytic carbon-silica adsorbents

   • R. Leboda

   Originals Pages: 524 - 528

6. Separation of D- and L-DOPA as their L-leucine derivatives by reversed-phase HPLC

   • J. Hermansson
   • B. Wiese

   Originals Pages: 529 - 534

7. Book reviews

   • L. S. Ettre
   • D. A. Ferguson

   BookReview Pages: 535 - 535

8. Announcements

   Announcement Pages: 538 - 538

9. New products

   Announcement Pages: 539 - 545

10. Einflußfaktoren auf die Strömungsgeschwindigkeit in chromatographischen Trennsäulen

    • C. A. Cramers
    • J. A. Rijks
    • C. P. M. Schutjes

    Green Pages Pages: 547 - 553