The Magnetic Field of Ganymede: Fossil or Vital Sign? (original) (raw)

The strong magnetic field detected around Ganymede by the Galileo probe has caused many to conclude that Ganymede possesses a working dynamo, despite the inherent difficulties in keeping the core of Ganymede partly molten over >4 Ga and other problems. This paper explores the possibility of remanent magnetism of the outer solid portion of Ganymede as a major component of the observed field by examining and correcting the mathematical treatments of magnetization of exterior shells by past interior dynamos by Runcorn (1975) and Crary and Bagenal (1998). Although errors and hidden assumptions were present in both derivations, the conclusion of Crary and Bagenal that an exterior remanent field would remain after shutdown of an interior dynamo given an adequately high magnetizability of the shell remains valid.

[Gamna-Gandy bodies in cirrhosis: a meaningless finding?]

Journal de radiologie, 2011

To determine the presence of Gamna-Gandy bodies (GGB) on MRI in patients with liver cirrhosis. A total of 117 consecutive patients with cirrhosis followed-up by MRI were retrospectively reviewed. Two groups were defined: the first group included patients with GGB on MRI (n=15), the other group included patients without GGB (n=102). Both characteristics of groups were reviewed using standard cirrhosis criteria evaluation: sex, age, etiology of cirrhosis, Child-Pugh score, presence of esophageal varices, splenomegaly, ascitis, recanalization of the periumbilical veins, and presence of hepatic encephalopathy. Fisher's exact test and student t-test were used to compare both groups. GGB were more frequently observed in patients with splenomegaly (P=0.035). Hemochromatosis was the only etiology for cirrhosis statistically correlated to the presence of GGB (P=0.006) in our series. No other statistically significant association was noted between GGB and other characteristics of our cirr...

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La pierre magnétique de l'amour

n Liber aureus. Mélanges d'antiquité et de contemporéanité offerts à Nicole Fick, textes rassemblés et édités par Sylvie Laigneau-Fontaine et Fabrice Poli, Nancy, ADRA, Études anciennes 46, p. 209-218., 2012