149,678 research outputs found
Intrinsic paramagnetic Meissner effect due to s-wave odd-frequency superconductivity
No full textIn 1933, Meissner and Ochsenfeld reported the expulsion of magnetic flux-the diamagnetic Meissner effect-from the interior of superconducting lead. This discovery was crucial in formulating the Bardeen-Cooper-Schrieffer (BCS) theory of superconductivity. In exotic superconducting systems BCS theory does not strictly apply. A classical example is a superconductor-magnet hybrid system where magnetic ordering breaks time-reversal symmetry of the superconducting condensate and results in the stabilization of an odd-frequency superconducting state. It has been predicted that under appropriate conditions, odd-frequency superconductivity should manifest in the Meissner state as fluctuations in the sign of the magnetic susceptibility, meaning that the superconductivity can either repel (diamagnetic) or attract (paramagnetic) external magnetic flux. Here, we report local probe measurements of faint magnetic fields in a Au=Ho=Nb trilayer system using low-energy muons, where antiferromagnetic Ho (4.5 nm) breaks time-reversal symmetry of the proximity-induced pair correlations in Au. From depth-resolved measurements below the superconducting transition of Nb, we observe a local enhancement of the magnetic field in Au that exceeds the externally applied field, thus proving the existence of an intrinsic paramagnetic Meissner effect arising from an odd-frequency superconducting state.Peer reviewe
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Origin and regenerative potential of vertebrate mechanoreceptor-associated stem cells
No full textWidera D, Hauser S, Kaltschmidt C, Kaltschmidt B. Origin and regenerative potential of vertebrate mechanoreceptor-associated stem cells. Anatomy Research International. 2012;2012:1-9.Meissner corpuscles and Merkel cell neurite complexes are highly specialized mechanoreceptors present in the hairy and glabrous skin, as well as in different types of mucosa. Several reports suggest that after injury, such as after nerve crush, freeze injury, or dissection of the nerve, they are able to regenerate, particularly including reinnervation and repopulation of the mechanoreceptors by Schwann cells. However, little is known about mammalian cells responsible for these regenerative processes. Here we review cellular origin of this plasticity in the light of newly described adult neural crest-derived stem cell populations. We also discuss further potential multipotent stem cell populations with the ability to regenerate disrupted innervation and to functionally recover the mechanoreceptors. These capabilities are discussed as in context to cellularly reprogrammed Schwann cells and tissue resident adult mesenchymal stem cells
Gemälde über die Ober-Lausiz : Gesammelt auf einer kleinen Fußreise; Mit einem illuminirten Tittelkupfer / Von G. Benj. Meißner
No full textEnth. 6 Bl. Verzeichnis neuer Bücher im Verlag G. Benj. MeißnerVorlageform des Erscheinungsvermerks: Leipzig 1798 bei G. Benj. Meißner Im Fürstenhause. - Vorlageform des Erscheinungsvermerks vom Kolophon: Leipzig gedruckt bei Carl Tauchnitz.Frontisp
Topographische Karte des Herzogtums Oldenburg im Maßstabe 1:50000 / Blatt 4 Stollhamm
No full textentworfen vom Verm.-Director von Schrenck ; gezeichnet von den Verm.-Conducteurs Francke u. Meissner ; gravirt von VogelZählung oben links, Titel oben rechts, Maßstab unten MitteMaßstab in grafischer Form (Oldenb. Kataster Ruthen, Geogr. Meile)Mit TiefenangabenNullmeridian: Ferr
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Meissner holes in remagnetized superconductors
No full textFlux distributions on different faces of YBCO single crystals remagnetized by unidirectional and rotating fields are studied using advanced magneto-optical techniques. Unusual structures corresponding to the appearance of strong current concentration along certain fronts are found. At such fronts the vortex lines bend into closed loops which then collapse and form flux free cylinders. Strong magnetization currents along these Meissner holes result in essential flux redistribution and development of dynamical instabilities in the samples
Mettlerkamp, der Führer einer am deutschen Freiheitskriege theilnehmenden Bürgerwehr : mit Benutzung des handschriftlichen Nachlasses Mettlerkamps
No full textvon Fr. WilleMit Exlibris von Conrad Ferdinand Meyer Exemplar der Zentralbibliothek Zürich, C.F.-Meyer-BibliothekAus dem Vorbesitz von Conrad Ferdinand Meyer Exemplar der Zentralbibliothek Zürich, C.F.-Meyer-Bibliothek"Herrn K F. Meyer / in freundschaftlicher Hochachtung u Sympath / der Verfasser" Exemplar der Zentralbibliothek Zürich, C.F.-Meyer-Bibliothe
Clinical Features of Rapidly Progressive Alzheimer's Disease
No full textObjective: To characterize clinical features, CSF biomarkers and genetic polymorphisms of patients suffering from a rapidly progressing subtype of Alzheimer's dementia (rpAD). Methods: Retrospective analyses of 32 neuropathologically confirmed cases differentially diagnosed as AD out of a group with rapidly progressive dementia. CSF biomarkers (14-3-3, tau, beta-amyloid 1-42) and genetic markers (PRNP codon 129, apolipoprotein E, ApoE, polymorphism) were determined. Results: Median survival was 26 months, age at onset 73 years. Biomarkers: mean beta-amyloid 1-42: 266 pg/ml, median tau: 491 pg/ml, 14-3-3 positive: 31%. Genetic polymorphisms showed a predominance of methionine homozygosity at PRNP codon 129 and a low frequency of ApoE4 (38%, no homozygous patients). Thirty-five symptoms were studied. Frequent symptoms were myoclonus (75%), disturbed gait (66%) and rigidity (50%). Discussion: rpAD is associated with a diversity of neurological signs even able to mimic Creutz feldt-Jakob disease. Biomarkers and genetic profile differ from those seen in classical AD. The findings on biomarkers, symptomatology and genetics may aid the differential diagnostic process. Copyright (C) 2010 S. Karger AG, Base
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