Publications by authors named "A M Collot"
Emissions of plastic waste to the environment and the subsequent degradation into microplastic particles that have the potential to interact with biological organisms represent a concern for global society. Current understanding of the potential impacts on aquatic and terrestrial population stability and ecosystem structure and function associated with emissions of microplastic particles is limited and insufficient to fully assess environmental risks. Multistakeholder discussions can provide an important element in helping to identify and prioritize key knowledge gaps in assessing potential risks.
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- A study shows that metal ions are more effective catalysts than protons in the enolization of phenylacetylpyrazine, with zinc being significantly more efficient (k(Zn)/k(H) = 600) compared to phenacylpyridine (k(Zn)/k(H) = 0.0065).
- The difference in catalytic efficiency is linked to the thermodynamics of proton and metal ion binding, highlighting that protons bind more strongly to the nitrogen in pyridine compared to pyrazine.
- The research also includes measurements of tautomerization equilibrium constants and pKa values, indicating that ketonization is efficiently catalyzed by metal ions but inhibited by acids.
Atrial septal aneurysm is an uncommon condition. Between 1981 and 1984 10 cases of atrial septal aneurysm were diagnosed by real time cross sectional echocardiography performed in 4840 patients. The aneurysm was associated either with mitral valve prolapse (three patients) or with atrial septal defect (three patients) or occurred in isolation (four patients, two of whom had had a previous embolic event leading to the diagnosis of atrial septal aneurysm by cross sectional echocardiography).
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