965 research outputs found
Searching for a Quantum Critical Point in Rh doped ferromagnetic Ce2.15Pd1.95In0.9
No full textLow temperature magnetic and thermal ( C m ) properties of the ferromagnetic (FM) alloys Ce 2.15 (Pd 1− x Rh x ) 1.95 In 0.9 were investigated in order to explore the possibility for tuning towards a quantum critical point (QCP) by doping Pd with Rh. As expected, the magnetic transition decreases from T = 4.1K at x = 0 with increasing Rh concentration. However, the phase boundary splits into two transitions, the upper being antiferromagnetic (AF) whereas the lower FM. The AF phase boundary extrapolates to T N = 0 for x cr ≈ 0.65 whereas the first order FM transition vanishes at x ≈ 0.3. The quantum critical character of the T N → 0 point is inferred from the divergent T dependence of the tail of C m /T observed in the x = 0.5 and 0.55 alloys, and the tendency to saturation of the maximum of C m ( T N )/ T currently observed in exemplary Ce compounds when T N → 0. Beyond the critical concentration the unit cell volume deviates from the Vegard´s law in coincidence with a strong increase of the Kondo temperature.Fil: Sereni, Julian Gustavo Renzo. Consejo Nacional de Investigaciones Científicas y Técnicas; Argentina. Comisión Nacional de Energía Atómica. Gerencia del Area de Investigación y Aplicaciones No Nucleares. Gerencia de Física (Centro Atómico Bariloche). División Bajas Temperaturas; ArgentinaFil: Giovannini, M.. Università di Genova; ItaliaFil: Gomez Berisso, Mariano. Consejo Nacional de Investigaciones Científicas y Técnicas; Argentina. Comisión Nacional de Energía Atómica. Gerencia del Area de Investigación y Aplicaciones No Nucleares. Gerencia de Física (Centro Atómico Bariloche). División Bajas Temperaturas; ArgentinaFil: Saccone, A.. Università di Genova; Itali
"Ognun esser non puote il sacro Dante": un percorso letterario tra Quattro e Cinquecento
No full textEvaluation of damaging effects of splicing mutations: validation of an in vitro method for diagnostic laboratories
No full textBackground: Pre-mRNA splicing defects may have an important impact on clinical phenotype in several diseases, but often their pathogenic role is difficult to demonstrate. The aim of this study was to validate an in vitro method to assess the effects of putative splicing variants. Materials and methods: We studied three novel variants in vitro using a novel minigene approach and compared results with in silico and ex vivo strategies from patient samples. Results: For the c.1146C>T variant in the LMNA gene, in vitro and ex vivo studies were concordant with the prediction obtained by in silico tools, confirming the loss of 13. bp at the end of exon 6. In the second case (c.1140+1G>A, SCN5A gene), in vitro experiments identified the insertion of 94 intronic bp in exon 9 as well as exon 9 skipping, but these results were not correctly predicted by ex vivo data and in silico tools. In the third case (c.1608+1C>T, LMNA gene) in vitro and ex vivo studies suggested the recognition of an exonic cryptic site leading to the loss of 29. bp in exon 9, not predicted by in silico analysis. Conclusion: Our results revealed how in silico tools are often unreliable requiring wetRNA analysis. Since ex vivo studies are not always feasible, the use of an in vitro construct represents an efficient and useful method for the evaluation of damaging effects of unknown splicing variants, especially in diagnostic laboratories. � 2014 Elsevier B.V
Dante Alighieri, "Opere", vol. I ("Rime", "Vita nova", "De vulgari eloquentia"), a c. di C. Giunta. G. Gorni, M. Tavoni, Milano, Mondadori, 2011
No full textElectron concentration effects on the Shastry-Sutherland phase stability in Ce<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mrow><mml:msub><mml:mrow /><mml:mrow><mml:mn>2</mml:mn><mml:mo>−</mml:mo><mml:mi>x</mml:mi></mml:mrow></mml:msub></mml:mrow></mml:math>Pd<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mrow><mml:msub><mml:mrow /><mml:mrow><mml:mn>2</mml:mn><mml:mo>+</mml:mo><mml:mi>y</mml:mi></mml:mrow></mml:msub></mml:mrow></mml:math>In<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mrow><mml:msub><mml:mrow /><mml:mrow><mml:mn>1</mml:mn><mml:mo>−</mml:mo><mml:mi>z</mml:mi></mml:mrow></mml:msub></mml:mrow></mml:math>solid solutions
No full textCompetition between ferromagnetism and frustrated antiferromagnetism in quasi 2D Ce2.15(Pd1-xAgx)1.95In0.9 alloys
No full textLow temperature thermal and magnetic measurements performed on ferro-magneticl (FM) alloys of composition Ce2.15(Pd1-xAgx)1.95In0.9 are presented. Pd substitution by Ag depresses from 4.1 K down to 1.1 K for x = 0.5, which is related to the increase of band electrons, with a critical concentration extrapolated to . The decrease is accompanied by a weakening of the magnetization of the FM phase. At high temperature (T > 30 K) the inverse magnetic susceptibility reveals the presence of robust magnetic moments ( ), whereas the low value of the Curie-Weiss temperature K excludes any relevant effect from Kondo screening. The specific heat jump at decreases accordingly, while an anomaly emerges at a fixed temperature K. This unexpected anomaly does not show any associated sign of magnetism checked by AC-susceptibility measurements. Since the total magnetic entropy (evaluated around ) practically does not change with Ag concentration, the transference of degrees of freedom from the FM component to the non-magnetic T ∗ anomaly is deduced. The origin of this anomaly is attributed to an arising magnetic frustration of the ground state and the consequent entropy bottleneck produced by the divergent increasing of density of excitations at low temperature
«Scribi fecit in civitate Ianue». Leggere, copiare, interpretare Dante in Liguria fra Trecento e Quattrocento
No full textEmerging frustration effects in ferromagnetic Ce_2[Pd_1-xAg_x]_2In alloys
No full textMagnetic and thermal properties of Ferromagnetic (FM)
Ce_2.15(Pd_1-xAg_x)_1.95In_0.9 alloys were studied in order to
determine the Quantum Critical Point (QCP) at T_C => 0. The increase of band
electrons produced by Pd/Ag substitution depresses T_C(x) from 4.1K down to
T_C(x=0.5)=1.1K, with a QCP extrapolated to x_QCP~ 0.6. Magnetic
susceptibility from T>30K indicates an effective moment slightly decreasing
from \mu_eff=2.56\mu_B to 2.4\mu_B at x=0.5. These values and the
paramagnetic temperature \theta_P~ -10K exclude significant Kondo screening
effects. The T_C(x) reduction is accompanied by a weakening of the FM
magnetization and the emergence of a specific heat C_m(T) anomaly at T*~ 1K,
without signs of magnetism detected from AC-susceptibility. The magnetic
entropy collected around 4K (i.e. the T_C of the x=0 sample) practically does
not change with Ag concentration: S_m(4K)~ 0.8 Rln2, suggesting a progressive
transfer of FM degrees of freedom to the non-magnetic (NM) component. No
antecedent was found concerning any NM anomaly emerging from a FM system at
such temperature. The origin of this anomaly is attributed to an 'entropy
bottleneck' originated in the nearly divergent power law dependence for T>T*
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