Buchbesprechungen

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Book reviews

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Notices bibliographiques

     

Über Phenolalkohole

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Cell-based biosensors

Different classes of cell-based biosensors are introduced. These include devices to measure cell-cell contact and set-ups to determine metabolic products. Main emphasis is put on sensors based on nerve-cell networks which are able to detect neuro-active compounds. The different experimental set-ups are explained and examples for typical applications are given. A main point concerns new achievements and prospects for future developments. Received: 26 August 1999 / Revised: 29 November 1999 / Accepted: 11 December 1999     

On quantitative aspects of the unit sum number problem

We investigate the function u _K,S (n; q) which counts the number of representations of algebraic integers α with |N_{K/\mathbb Q}(a)| ￡ q{|N_{K/{\mathbb Q}}(\alpha)| \leq q} for some real positive q that can be written as sums of exactly n S-units of the number field K.     

Erzwungene Schwingungen mit konstanter Dämpfung

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A multi-coincident study of the quasimolecular 1s σ radiation and its angular distribution in 40 MeV Ni-Ni collisions

The production mechanism of quasimolecular (MO) x-rays in 40 MeV Ni-Ni collisions was investigated in a multi-parameter experiment. Impact parameter dependent MO x-ray production probabilities were determined. The study of the angular distribution of the emitted radiation allowed the determination of impact parameter dependent alignment parameters for this process. Triple coincident MO x-ray — NiK x-ray — scattered projectile data provided for the determination of state selective MO x-ray production probabilities. The results are compared to dynamical calculations describing the time dependent evolution of the relevant quasimolecular states and the radiative couplings among them.