Thermodynamic investigation of the helix-coil transitions of a polyribonucleotide system

Neumann E, Ackermann T. Thermodynamic investigation of the helix-coil transitions of a polyribonucleotide system. Journal of Physical Chemistry. 1969;73(7):2170-2178

Experimental thermodynamics of the helix-random coil transition. II. Calorimetric measurement of transition enthalpies of poly A in acid aqueous solution

Klump H, Ackermann T, Neumann E. Experimental thermodynamics of the helix-random coil transition. II. Calorimetric measurement of transition enthalpies of poly A in acid aqueous solution. Biopolymers. 1969;7(3):423-431.The enthalpy change accompanying the double helix-coil transition of polyriboadenylic acid (poly A) in aqueous solution has been measured optically and calorimetrically in the pH range 5.7-4.5. The course of this cooperative transition was followed optically by measuring changes in ultraviolet absorption as a function of temperature at different pH values, and calorimetrically by determining the heat capacity of the solution through the transition region. From the latter measurements, the enthalpy of transition was calculated. It is shown, that H is dependent on pH as it is expected from the influence of protonation of the double helix of poly A

Calorimetric measurement of transition enthalpies in the polynucleotidesystem poly A-poly U

Neumann E, Ackermann T. Calorimetric measurement of transition enthalpies in the polynucleotidesystem poly A-poly U. Journal of Physical Chemistry. 1967;71(7):2377-2379

Atlas zu: Die Choleraepidemie des Jahres 1859 im Grossherzogthum Mecklenburg-Schwerin

von Th. Ackerman

Ueber die Ursachen epidemischer Krankheiten : Vortrag, gehalten in der Aula der Universität zu Rostock

von Ackerman

Études calorimétriques et spectroscopiques (I. R.) des solutions électrolytiques

En continuant des investigations précédentes l’influence des ions et des groupes non-polaires sur la structure de l’eau est discutée en raison de mesures de chaleurs molaires partielles [math] de quelques électrolytes. Des études par spectrométrie infrarouge sur des films de résine échangeuse d’anions permettent aussi des affirmations sur l’interaction ion-solvant