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F Dauvergne

Publications and source records attributed to F Dauvergne.

3 recordsLinked to original sources

[Disabilities, access to medical care, and way of life of adults with cerebral palsy. APIB study: initial results].

UNLABELLED: Cerebral palsy is defined as a nonprogressive brain lesion that occurs during prenatal or perinatal development. The Breizh IMC health network objective is to improve the knowledge about the way of life and the health status of adults with cerebral palsy. OBJECTIVE: To describe disabilities, way of life and access to medical care for older teens and adults with cerebral palsy. METHOD: We conducted a descriptive study using health insurance data to contact patients. A questionnaire was addressed to people with cerebral palsy who were older than 16 years. Data were then compared to data of a general population sample. RESULTS: In total, 562 persons responded: 56% male and 44% female, mean age 36. Motor disability was more important with age (50% at age 20 and 70% after 60). A total of 66% of the sample? had cognitive impairment or mental retardation, 60% needed help when going outside, and 40% required assistance with eating, bathing and dressing. The level of education was variable. Health problems were more frequent in patients with cerebral palsy than in the general population and were progressive. Of the sample, 75% experienced pain and half felt depressed or lonely. Medication use was higher in the sample than in the general population. CONCLUSION: More study is needed to improve the knowledge of the health status of patients with cerebral palsy. This study highlights health problems that may be considered a basis for the development of care programs.

Adult↗

Anomalous Dispersion with Edges in the Soft X-ray Region: First Results of Diffraction from Single Crystals of Trypsin Near the K-Absorption Edge of Sulfur.

Anomalous dispersion of X-ray diffraction at wavelengths near the X-ray K-absorption edge of sulfur at wavelengths around 5 A has been applied to single crystals of trypsin obtained from an ammonium sulfate solution. The multiwavelength anomalous-dispersion method based on 775 unique reflections (+183 Bijvoet mates) measured at three wavelengths near the K-absorption edge of sulfur in trypsin (two methionines and disulfide bridges of six cystines) reproduces the known features of the trypsin structure of a resolution of 4 A. It appears that there is anisotropic anomalous scattering from the disulfide bridges of cystine. The multiwavelength anomalous solvent contrast shows up at wavelengths near the K-absorption edge of the sulfate ions, which is shifted by 10 eV to higher energies with respect to that of sulfur in trypsin. The influence of the complex contrast of trypsin in 2.5 M ammonium sulfate on the dispersion of a low-order reflection is analyzed. The measurement of anomalous dispersion of X-ray diffraction at long wavelengths beyond 5 A requires a special diffractometer, the features of which are presented. An outstanding one is a detector system consisting of four multiwire proportional counters. Its efficiency is compared with that of imaging plates. The influence of radiation damage with soft X-ray diffraction from single crystals of trypsin is presented and possible remedies are discussed.

Journal Article↗

Image plate detectors for macromolecular neutron diffractometry.

Neutron diffraction studies of macromolecules require large position sensitive detectors. It is proposed that such a device can be based on image plate technology, which relies on re-usable photostimuable phosphors, combined with a neutron to gamma-ray converter. Design parameters such as the best wavelength for the neutron radiation and the optimum sample to detector distance are discussed, and a design for a cylindrical detector is outlined. Presently a prototype of such a detector is being built, and the very first test-recording of an X-ray diffraction pattern from a protein crystal is presented.

Journal Article↗