À quelles conditions la Loi fonctionne-t-elle come Bonne Nouvelle selon l'Évangile de Marc?

Malgrat que és l’únic evangelista que mai fa servir la paraula «llei» (nomos), Marc tanmateix té la seva pròpia perspectiva d’aquest tema tan important en el Judaisme, la religió en la qual el moviment de Jesús va néixer. L’article està consagrat a estudiar la discussió referent a la impuresa en Mc 7,1-23, una perícopa que constitueix una clau de gran significació per entendre el tema de la llei. Pres com un tot, sembla que Marc no és antinòmic. En el seu punt de vista, la llei roman com a bona notícia, però sota certes condicions: ha de estar sotmesa a l ‘Evangeli del Regne de Déu i a les seves claus interpretatives de vida

Existence and Stability of Propagating Fronts for an Autocatalytic Reaction-Diffusion System

We study a one-dimensional reaction-diffusion system which describes an isothermal autocatalytic chemical reaction involving both a quadratic (A + B -> 2B) and a cubic (A + 2B -> 3B) autocatalysis. The parameters of this system are the ratio D = D_B/D_A of the diffusion constants of the reactant A and the autocatalyst B, and the relative activity k of the cubic reaction. First, for all values of D > 0 and k >= 0, we prove the existence of a family of propagating fronts (or travelling waves) describing the advance of the reaction. In particular, in the quadratic case k=0, we recover the results of Billingham and Needham [BN]. Then, if D is close to 1 and k is sufficiently small, we prove using energy functionals that these propagating fronts are stable against small perturbations in exponentially weighted Sobolev spaces. This extends to our system part of the stability results which are known for the scalar Fisher equation.Comment: 32 pages, 1 Postscript figur

Expression of myofibrillar proteins and parvalbumin isoforms in white muscle of the developing turbot <i>Scophthalmus maximus</i> (Pisces, Pleuronectiformes)

Expression of polymorphic myofibrillar and sarcoplasmic proteins was investigated in the fish Scophthalmus maximus (L.) undergoing metamorphosis. A range of electrophoretic techniques was used to monitor sequential synthesis of isoforms from hatching to the adult stage. Two isoforms (larval and adult) of myosin light chain LC2 and troponin-I were successively detected during turbot growth, in addition to variations in the peptide composition of myosin heavy chains. Two isoforms of troponin-T also appeared sequentially, but the first to make its appearance was not detected until the juvenile stage. The composition of alkali light chains, actin, tropomyosin, and troponin-C did not seem to change as the fish progressed through the different stages. Parvalbumin isoforms were isolated and their physico-chemical parameters defined. As in the other fish examined so far, there appeared a succession of larval (PA IIa and PA IIb) and adult (PA V) parvalbumin isoforms through the life of the fish. All these biochemical changes occurred gradually in the course of turbot development, and did not appear particularly related to metamorphosis but rather to physiological needs of the different growth stages