Göttingen, Germany
Göttingen, Germany

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Castren M.,Sodersjukhuset | Castren M.,Karolinska Institutet | Nordberg P.,Sodersjukhuset | Svensson L.,Sodersjukhuset | And 19 more authors.
Circulation | Year: 2010

Background: Transnasal evaporative cooling has sufficient heat transfer capacity for effective intra-arrest cooling and improves survival in swine. The aim of this study was to determine the safety, feasibility, and cooling efficacy of prehospital transnasal cooling in humans and to explore its effects on neurologically intact survival to hospital discharge. Methods and Results: Witnessed cardiac arrest patients with a treatment interval ≤20 minutes were randomized to intra-arrest cooling with a RhinoChill device (treatment group, n=96) versus standard care (control group, n=104). The final analysis included 93 versus 101 patients, respectively. Both groups were cooled after hospital arrival. The patients had similar demographics, initial rhythms, rates of bystander cardiopulmonary resuscitation, and intervals to cardiopulmonary resuscitation and arrival of advanced life support personnel. Eighteen device-related adverse events (1 periorbital emphysema, 3 epistaxis, 1 perioral bleed, and 13 nasal discolorations) were reported. Time to target temperature of 34°C was shorter in the treatment group for both tympanic (102 versus 282 minutes, P=0.03) and core (155 versus 284 minutes, P=0.13) temperature. There were no significant differences in rates of return of spontaneous circulation between the groups (38% in treated subjects versus 43% in control subjects, P=0.48), in overall survival of those admitted alive (44% versus 31%, respectively, P=0.26), or in neurologically intact survival to discharge (Pittsburgh cerebral performance category scale 1 to 2, 34% versus 21%, P=0.21), although the study was not adequately powered to detect changes in these outcomes. Conclusions-: Prehospital intra-arrest transnasal cooling is safe and feasible and is associated with a significant improvement in the time intervals required to cool patients. © 2010 American Heart Association, Inc.

Kveder V.,RAS Institute of Solid State Physics | Khorosheva .,RAS Institute of Solid State Physics | Seibt M.,Georg August UniversitatGottingen
Solid State Phenomena | Year: 2016

We show experimentally that dislocations in Si crystals can generate some unknown vacancy complexes Vxtrail in their slip planes during their motion at 600°C. Most of these “dislocation trail defects” are not electrically active but can be detected by their reaction with gold atoms during in-diffusion experiments. It was also shown that contrary to gold, the Vxtrailcomplexes do not react with interstitial Ni atoms. It means that the binding energy Ebind of Vxtrail complexes is quite high (Ebind>2.5eV), higher than the binding energy of vacancy complexes generated during FZ-Si crystal growth. It was also shown that Ni in-diffusion results in a strong increase of electron-hole recombination at dislocations and in a strong increase of dislocationrelated DLTS C-line. © (2016) Trans Tech Publications, Switzerland.

Vanderpoorten A.,University of Liège | Schafer-Verwimp A.,Mittlere Letten 11 | Heinrichs J.,Georg August UniversitatGottingen | Devos N.,University of Liège | Long D.G.,Royal Botanic Garden Edinburgh
Taxon | Year: 2010

A revised classification of the liverwort genus Leptoscyphus (Lophocoleaceae) is presented on the basis of previous phylogenetic analyses as well as morphological examination of recent plant material and type specimens. The three subgenera that have traditionally been recognized based on morphological grounds, namely Leptoscyphus subg. Anomylia, L.subg. Physoscyphus, and L.subg. Leptoscyphus, are well retrieved by the phylogeny. Two new subgenera, L. subg. Spinoscyphus and L. subg. Australoleptoscyphus, are created for L.cleefii and L.spectabilis and the southern South Hemisphere species, respectively. Three new species, namely L.gradsteinii,L.lambinonii, and L.sotiauxii,are described here based on molecular and morphological evidence. The new combination L.porphyrius subsp. azoricus is made. Lectotypes are designated for Chiloscyphus australis, C. huidobroanus, Jungermannia amphibolia, J. pallidovirens, J. physocalyx, Lophocolea belmorana, L. diversifolia, L. excipulata, and Mylia azorica.

Stingl C.,Georg August UniversitatGottingen | Perry R.S.,University of Edinburgh | Maeno Y.,Kyoto University | Gegenwart P.,Georg August UniversitatGottingen
Physica Status Solidi (B) Basic Research | Year: 2010

Weuse high-resolution capacitive dilatometry to study the lowtemperature linear magnetostriction of the bilayer ruthenate Sr3Ru2O7 as a function of magnetic field applied perpendicular to the ruthenium-oxide planes (B k c). The relative length change ΔL(B)/L is detected either parallel or perpendicular to the c-axis close to the metamagnetic region near B=8T. In both cases, clear peaks in the coefficient λ(B) = d(ΔL/L)/dB at three subsequent metamagnetic transitions are observed. For ΔL ? c, the third transition at 8.1 T bifurcates at temperatures below 0.5 K. This is ascribed to the effect of an in-plane uniaxial pressure of about 15 bar, unavoidable in the dilatometer, which breaks the original fourfold in-plane symmetry. © 2010 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim.

Bergmann C.,Georg August UniversitatGottingen | Jeevan H.S.,Georg August UniversitatGottingen | Schubert M.,Georg August UniversitatGottingen | Geibel C.,Max Planck Institute for Chemical Physics of Solids | Gegenwart P.,Georg August UniversitatGottingen
Physica Status Solidi (B) Basic Research | Year: 2010

In order to investigate the low-temperature electronic properties of the heavy-fermion metal CeNi2Ge2, single crystals were grown using the floating zone technique. Previous investigations on polycrystals of CeNi2Ge2 have revealed that the low-temperature properties, i.e., non-Fermi liquid (NFL) behavior and incipient superconductivity, are strongly sample dependent, possibly due to a slight variation of the Ni and Ge content. We prepared polycrystalline feed rods of slightly off-stoichiometric composition by induction or arc-melting methods and grew single crystals using a four-mirror optical furnace under high-purity argon atmosphere. As a result, large single crystals of few centimeter size have been obtained. Annealed pieces were investigated by measurements of the temperature dependence of the electrical resistivity r(T). A clear correlation between the starting composition and the obtained resistivity ratio (RR2K) was found with the highest ratio for a nominal starting composition of Ce0.98Ni2.025Ge1.975 (RR2K = 29). The temperature dependence of the electrical resistivity is similar as reported previously and displays NFL behavior below 1 K. © 2010 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim.

Schneider M.,Georg August UniversitatGottingen | Moshnyaga V.,Georg August UniversitatGottingen | Gegenwart P.,Georg August UniversitatGottingen
Physica Status Solidi (B) Basic Research | Year: 2010

The ferromagnetic (FM) quantum phase transition in the perovskite ruthenate Sr1_xCaxRuO3 is studied by low-temperature magnetization and electrical resistivity measurements on thin films. The films were grown epitaxially on SrTiO3 substrates using metalorganic aerosol deposition and characterized by X-ray diffraction and room temperature scanning tunneling microscopy. High residual resistivity ratios of 29 and 16 for x = 0 and 1, respectively, prove the high quality of the investigated samples. We observe a continuous suppression of the FM Curie temperature from TC = 160K at x = 0 towards TC → 0 at xc ≈ 0:8. The analysis of the electrical resistivity between 2 and 10K reveals T* and T* behavior at x ≤ 0:6 and x ≥ 0:7, respectively. For undoped CaRuO3, the measurement has been extended down to 60 mK, revealing a crossover to T* behavior around 2K, which suggests a Fermi-liquid ground state in this system. © 2010 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim.

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