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21.
Background
The presynaptic protein α-synuclein is involved in a range of neurodegenerative diseases. Here we analyze potential compensatory mechanisms in α-synuclein null mutant mice. Furthermore, the findings reveal problems that may be associated with inbred mouse strains. 相似文献22.
Arnaldi R Banicz K Castor J Chaurand B Cicalò C Colla A Cortese P Damjanovic S David A de Falco A Devaux A Ducroux L En'yo H Fargeix J Ferretti A Floris M Förster A Force P Guettet N Guichard A Gulkanian H Heuser JM Keil M Kluberg L Lourenço C Lozano J Manso F Martins P Masoni A Neves A Ohnishi H Oppedisano C Parracho P Pillot P Poghosyan T Puddu G Radermacher E Ramalhete P Rosinsky P Scomparin E Seixas J Serci S Shahoyan R Sonderegger P Specht HJ Tieulent R Usai G Veenhof R 《Physical review letters》2007,99(13):132302
The NA60 experiment studies muon pair production at the CERN Super Proton Synchrotron. In this Letter we report on a precision measurement of J/psi in In-In collisions. We have studied the J/psi centrality distribution, and we have compared it with the one expected if absorption in cold nuclear matter were the only active suppression mechanism. For collisions involving more than approximately 80 participant nucleons, we find that an extra suppression is present. This result is in qualitative agreement with previous Pb-Pb measurements by the NA50 experiment, but no theoretical explanation is presently able to coherently describe both results. 相似文献
23.
24.
R. Baur A. Breskin R. Chechik A. Drees C. Jacob U. Faschingbauer P. Fischer Z. Fraenkel E. Gatti P. Glässel Th. Günzel C. P. de los Heros F. Hess D. Irmscher B. Lenkeit L. H. Olsen Y. Panebrattsev A. Pfeiffer I. Ravinovich P. Rehak A. Schön J. Schukraft J. Schukraft M. Sampietro A. Shor H. J. Specht V. Steiner S. Tapprogge G. Tel-Zur I. Tserruya Th. Ullrich J. P. Wurm 《Zeitschrift fur Physik C Particles and Fields》1997,74(4):593-594
25.
26.
R. Schuch R. Hoffmann K. Müller E. Pflanz H. Schmidt-Böcking H. J. Specht 《Zeitschrift für Physik A Hadrons and Nuclei》1984,316(1):5-14
K-vacancy production probabilitiesP K (b) were measured with gas and solid targets byK-x-ray particle coincidences (impact parameterb is determined by the particle detection angle) in the region of light (Z P ?Z T ?10) up to intermediate heavy (Z P ?Z T ?36) collision systems. The measuredP K (b) reveal a very strong difference in shape between solid and gas targets independent ofZ. Only theP K (b) measured with gas targets and those measured with solid targets at very small impact parameters show reasonable good agreement with the 2pπ x-2pσ rotational coupling model. At largeb theP K (b) from solid targets are strongly influenced by a multiple collision effect, where projectileL-vacancies seem to be produced in collisions beforeK-vacancy production. However, this effect cannot be understood just by a two collision process whereL-vacancy production and 2pπ x-2pσ rotational coupling occurs in consecutive collisions. 相似文献
27.
S. Specht B. O. Schütz H. -J. Born 《Journal of Radioanalytical and Nuclear Chemistry》1974,21(1):167-176
In the course of ion-exchange separations of highly active solutions, the radiolysis gives rise to considerable disturbances
and deteriorated separation results. On the example of241Am/242Cm separations some results of radiolysis investigations for Dowex 50X8 are briefly shown, and experiences with the choice
of parameters of a high-pressure column system are described for several examples. 相似文献
28.
D. Habs V. Metag J. Schukraft H. J. Specht C. O. Wene K. D. Hildenbrand 《Zeitschrift für Physik A Hadrons and Nuclei》1977,283(3):261-268
Excitation functions and angular distributions have been measured for fission of238U induced by136Xe ions with bombarding energies between 4.5 and 5.9 MeV/N. Structures expected theoretically as characteristic for Coulomb fission have not been observed. The Q-value of ?(7.5±1.0) MeV measured for bombarding energies below 4.7MeV/N, however, appears to be compatible with inelastic scattering (e.g. Coulomb excitation) rather than subcoulomb transfer followed by fission. The total kinetic energy of deep inelastic events at 5.9 MeV/N is consistent with the current knowledge about mass diffusion, but also (for the highest excitation energies) with a fast fission process in the presence of the projectile. 相似文献
29.
Wolfgang Specht und Monika Tillkes 《Fresenius' Journal of Analytical Chemistry》1985,322(5):443-455
Zusammenfassung Für die im Jahre 1980 veröffentlichte Methode zur Aufarbeitung von Lebensmitteln und Futtermitteln für die Multirückstandsanalyse von Pflanzenbehandlungsmitteln [1] wird eine wesentlich erweiterte Tabelle der Bedingungen bei Gel-Chromatographie und MiniKieselgel-Säulen-Chromatographie von Pflanzenschutzmittel-Wirkstoffen, deren Metaboliten und Abbauprodukten sowie von umweltrelevanten Stoffen mitgeteilt. Es werden zusätzliche Hinweise zu den einzelnen Arbeitsschritten der 3. Mitteilung gegeben. Insgesamt werden Elutionsdaten für die Gel-Chromatographie und für die Mini-Kieselgel-Säulen-Chromatographie von mehr als 400 Stoffen aufgeführt.
1. Mitt. (1979) Organochlorpflanzenbehandlungsmittel in Tabak und Tabakerzeugnissen. Beitr Tabakforsch Int 10:73–79
2. Mitt. (1980) Bestimmung der Fungicide Bitertanol, Fluotrimazol, Fuberidazol, Imazalil, Rabenzazole, Triadimefon und Triadimenol in Pflanzen und Boden. Pflanzenschutz-Nachrichten Bayer 33:61–85
3. Mitt. (1980) Methode zur Aufarbeitung von Lebensmitteln und Futtermitteln pflanzlicher und tierischer Herkunft für die Multirückstandsbestimmung lipoid- und wasserlöslicher Pflanzenbehandlungsmittel. Fresenius Z Anal Chem 301:300–307
4. Mitt. (1981) Gas-chromatographische Bestimmung von 11 herbiciden Phenoxyalkancarbonsäuren und ihren Estern in Pflanzenmaterial. Fresenius Z Anal Chem 307:257–264 相似文献
Gas-chromatographic determination of pesticide residues after clean-up by gel-permeation chromatography and mini-silicagel-column chromatographyPart 5. Clean-up of foods and feeds of vegetable and animal origin for multiresidue analysis of fat-soluble and water-soluble pesticides
Summary An extended list of gel-permeation chromatography (GPC) conditions and mini-silicagel column chromatography conditions for the analysis of pesticides using the multiresidue method, first published in 1980 [1], is presented. Data for the elution of more than 400 pesticides, their metabolites and pollutants are given.
1. Mitt. (1979) Organochlorpflanzenbehandlungsmittel in Tabak und Tabakerzeugnissen. Beitr Tabakforsch Int 10:73–79
2. Mitt. (1980) Bestimmung der Fungicide Bitertanol, Fluotrimazol, Fuberidazol, Imazalil, Rabenzazole, Triadimefon und Triadimenol in Pflanzen und Boden. Pflanzenschutz-Nachrichten Bayer 33:61–85
3. Mitt. (1980) Methode zur Aufarbeitung von Lebensmitteln und Futtermitteln pflanzlicher und tierischer Herkunft für die Multirückstandsbestimmung lipoid- und wasserlöslicher Pflanzenbehandlungsmittel. Fresenius Z Anal Chem 301:300–307
4. Mitt. (1981) Gas-chromatographische Bestimmung von 11 herbiciden Phenoxyalkancarbonsäuren und ihren Estern in Pflanzenmaterial. Fresenius Z Anal Chem 307:257–264 相似文献
30.
Hans-Peter Thier Tjakko Stijve Wolfgang Specht 《Fresenius' Journal of Analytical Chemistry》1989,334(6):546-549
Summary During the last few years, the Working Group Pesticide Residues of the Food Chemistry and Forensic Chemistry Division of the Gesellschaft Deutscher Chemiker (German Chemical Society) has organised six laboratory performance tests on the analysis of pesticide residues in which numerous laboratories were involved. In these tests the choice of the analytical methods for the examination of fats or vegetable substrates was free. Organochlorine pesticides in concentrations of over 0.01 mg/kg were mostly readily identified, whereas in the analysis of organophosphorus residues often only the classic compounds (parathion, diazinon, etc.) were reported. Many a false positive result could have been avoided by using more adequate methods for confirmatory analysis. The quantitative results, however, were generally quite reliable and were mostly within the official acceptable dispersion range. It can be concluded that the performance of a residue laboratory is by no means constant, and that it is necessary to assess regularly the quality of the analytical results by participating in such interlaboratory tests.
Qualitätssicherung bei Rückstandsanalysen von PflanzenschutzmittelnErfahrungen aus Ringversuchen相似文献