Jean Michel Guilmot

SO2 Absorption Cross-section Measurement in the UV using a Fourier Transform Spectrometer

Absorption cross sections of SO2 have been recorded at 295 K at the resolutions of 2 and 16 cm−1. The 27000- to 40000-cm−1 spectral region has been investigated. The comparison with data available from the literature shows a good agreement between the different data sets (less than 5%). However, local discrepancies, for example at the peaks of absorption, can reach 20%.

The ν4 fundamental bands of trans- and cis-HNO2

Abstract The spectra of trans - and cis -HNO 2 have been recorded at an apodized resolution of 1.86 × 10 −3 cm −1 in the region of 600 to 1000 cm −1 . Some 1950 lines of a -type are assigned to the ν 4 fundamental band of trans -HNO 2 and over 3100 lines of a - and of b -types to the ν 4 fundamental band of cis -HNO 2 . Relative intensity information is discussed.

Arresting the mitotic oscillator and the control of cell proliferation: insights from a cascade model for cdc2 kinase activation.

We consider a minimal cascade model previously proposed11 for the mitotic oscillator driving the embryonic cell division cycle. The model is based on a bicyclic phosphorylation-dephosphorylation cascade involving cyclin and cdc2 kinase. By constructing stability diagrams showing domains of periodic behavior as a function of the maximum rates of the kinases and phosphatases involved in the two cycles of the cascade, we investigate the role of these converter enzymes in the oscillatory mechanism. Oscillations occur when the balance of kinase and phosphatase rates in each cycle is in a range bounded by two critical values. The results suggest ways to arrest the mitotic oscillator by altering the maximum rates of the converter enzymes. These results bear on the control of cell proliferation.