39 research outputs found
Dynamical effects induced by long range activation in a nonequilibrium reaction-diffusion system
We both show experimentally and numerically that the time scales separation
introduced by long range activation can induce oscillations and excitability in
nonequilibrium reaction-diffusion systems that would otherwise only exhibit
bistability. Namely, we show that the Chlorite-Tetrathionate reaction, where
autocatalytic species diffuses faster than the substrates, the spatial
bistability domain in the nonequilibrium phase diagram is extended with
oscillatory and excitability domains. A simple model and a more realistic model
qualitatively account for the observed behavior. The latter model provides
quantitative agreement with the experiments.Comment: 19 pages + 9 figure
Verrucous Carcinoma of the Nasal Septum and Columella
Tumours of the nasal septum are rare. They mostly concern squamous cell carcinomas. Verrucous carcinomas are exceptional, with only three well-documented cases in the literature. We operated such a tumour, localized both on the columella and nasal septum.SCOPUS: ar.jinfo:eu-repo/semantics/publishe
Pilomatrix carcinoma.
A 43-year-old man presented with a tumour of the medial part of the right eyebrow. A biopsy was performed and histological examination revealed a malignant transformation of a 'calcifying epithelioma of Malherbe'. A secondary wide excision was performed. Clinical and pathological findings of this extremely rare tumour are reviewed. Factors influencing the prognosis are proposed, based on a compilation of the literature.Case ReportsJournal ArticleSCOPUS: ar.jinfo:eu-repo/semantics/publishe