Ongewenste neveneffecten van lokale anesthesie

Lokale anesthetica worden in de tandheelkunde frequent toegepast. Aangezien weinig gegevens bekend zijn over de incidentie van complicaties na toediening van lokale anesthesie, werd een prospectief onderzoek verricht onder een groep van 219 patiënten. Complicaties die het meest frequent werden waargenomen waren insufficiënte anesthesie (17%) en positieve aspiratie (3%). Pijn tijdens injecteren, parese van de nervus facialis, lokale bleekheid (´blanching´), hematoom en vasovagale collaps werden als afzonderlijke complicatie bij minder dan 1% van de patiënten waargenomen. De resultaten suggereerden dat toediening van een lokaal anestheticum geassocieerd is met een kleine kans op ongewenste neveneffecten en dat deze ongewenste neveneffecten meestal lokale complicaties betreffen met een beperkte omvang en ernst

BTB and TAZ domain scaffold proteins perform a crucial function in Arabidopsis development

Plant science

Momentum Distribution in Nuclear Matter and Finite Nuclei

A simple method is presented to evaluate the effects of short-range correlations on the momentum distribution of nucleons in nuclear matter within the framework of the Green's function approach. The method provides a very efficient representation of the single-particle Green's function for a correlated system. The reliability of this method is established by comparing its results to those obtained in more elaborate calculations. The sensitivity of the momentum distribution on the nucleon-nucleon interaction and the nuclear density is studied. The momentum distributions of nucleons in finite nuclei are derived from those in nuclear matter using a local-density approximation. These results are compared to those obtained directly for light nuclei like $^{16}O$.Comment: 17 pages REVTeX, 10 figures ps files adde

Momentum and Energy Distributions of Nucleons in Finite Nuclei due to Short-Range Correlations

The influence of short-range correlations on the momentum and energy distribution of nucleons in nuclei is evaluated assuming a realistic meson-exchange potential for the nucleon-nucleon interaction. Using the Green-function approach the calculations are performed directly for the finite nucleus $^{16}$O avoiding the local density approximation and its reference to studies of infinite nuclear matter. The nucleon-nucleon correlations induced by the short-range and tensor components of the interaction yield an enhancement of the momentum distribution at high momenta as compared to the Hartree-Fock description. These high-momentum components should be observed mainly in nucleon knockout reactions like $(e,e'p)$ leaving the final nucleus in a state of high excitation energy. Our analysis also demonstrates that non-negligible contributions to the momentum distribution should be found in partial waves which are unoccupied in the simple shell-model. The treatment of correlations beyond the Brueckner-Hartree-Fock approximation also yields an improvement for the calculated ground-state properties.Comment: 12 pages RevTeX, 7 figures postscript files appende