569 research outputs found
Dringliche Eingriffe in der endokrinen Chirurgie
Während Notfalloperationen aus mechanischer Indikation immer wieder vorkommen (z. B. Chiasma-Syndrom, Atemwegsobstruktion), sind die kritischen Überfunktionen der endokrinen Drüsen in der Regel durch konservativ-medikamentöse Therapie ausreichend zu beherrschen. Ausnahmen: z. B. thyreotoxische Krise (bei nur kurz anhaltender Besserung durch Plasmapherese bei einer jodinduzierten Hyperthyreose) oder akutes Cushing-Syndrom (nicht beherrschbare hypokaliämische Alkalose). Solche Einzelfälle hängen von der optimalen Kooperation von Anaesthesie, Chirurgie und internistischer Intensivmedizin ab. Gesetze der Diagnose und der konservativen Vorbereitung für die operative Behandlung von endokrinen Überfunktionszuständen nur ultima ratio übertreten!Urgent surgery for emergency situations in endocrine diseases is needed for mechanical problems (e.g., chiasma syndrome or tracheal obstruction) and very rarely for endocrine hyperfunction, which can usually be treated by nonsurgical means. Exceptions are patients suffering from thyroid storm (impending early relapse after plasmapheresis due to excess iodine) or from acute Cushing's syndrome (intractable potassium loss and alkalosis whom we have successfully transferred to surgery. The rules for diagnosis and medical preparation for surgery of endocrine hyperfunctional states should only be disregarded ultima ratio
Limits on Neutrino Oscillations from the CHOOZ Experiment
We present new results based on the entire CHOOZ data sample. We find (at 90%
confidence level) no evidence for neutrino oscillations in the anti_nue
disappearance mode, for the parameter region given by approximately Delta m**2
> 7 x 10**-4 eV^2 for maximum mixing, and sin**2(2 theta) = 0.10 for large
Delta m**2. Lower sensitivity results, based only on the comparison of the
positron spectra from the two different-distance nuclear reactors, are also
presented; these are independent of the absolute normalization of the anti_nue
flux, the cross section, the number of target protons and the detector
efficiencies.Comment: 19 pages, 11 figures, Latex fil
Search for neutrino oscillations on a long base-line at the CHOOZ nuclear power station
This final article about the CHOOZ experiment presents a complete description
of the electron antineutrino source and detector, the calibration methods and
stability checks, the event reconstruction procedures and the Monte Carlo
simulation. The data analysis, systematic effects and the methods used to reach
our conclusions are fully discussed. Some new remarks are presented on the
deduction of the confidence limits and on the correct treatment of systematic
errors.Comment: 41 pages, 59 figures, Latex file, accepted for publication by
Eur.Phys.J.
Photoproduction of eta mesons from the neutron: cross sections and double polarization observable E
Photoproduction of mesons from neutrons} \abstract{Results from
measurements of the photoproduction of mesons from quasifree protons and
neutrons are summarized. The experiments were performed with the CBELSA/TAPS
detector at the electron accelerator ELSA in Bonn using the
decay. A liquid deuterium target was used for the
measurement of total cross sections and angular distributions. The results
confirm earlier measurements from Bonn and the MAMI facility in Mainz about the
existence of a narrow structure in the excitation function of . The current angular distributions show a forward-backward
asymmetry, which was previously not seen, but was predicted by model
calculations including an additional narrow state. Furthermore, data
obtained with a longitudinally polarized, deuterated butanol target and a
circularly polarized photon beam were analyzed to determine the double
polarization observable . Both data sets together were also used to extract
the helicity dependent cross sections and . The
narrow structure in the excitation function of
appears associated with the helicity-1/2 component of the reaction
The polarization observables T, P, and H and their impact on multipoles
Data on the polarization observables T, P, and H for the reaction are reported. Compared to earlier data from other experiments, our
data are more precise and extend the covered range in energy and angle
substantially. The results were extracted from azimuthal asymmetries measured
using a transversely polarized target and linearly polarized photons. The data
were taken at the Bonn electron stretcher accelerator ELSA with the CBELSA/TAPS
detector. Within the Bonn-Gatchina partial wave analysis, the new polarization
data lead to a significant narrowing of the error band for the multipoles for
neutral-pion photoproduction
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