In recent years, the mélange model has been increasingly considered as an important way to transfer slab components arc sources in modern subduction zones. This differs from classic fluid/melt metasomatism that it invokes physical mixing of bulk sediment, altered oceanic crust (AOC), serpentinite, and mantle wedge at slab-mantle interface. However, due lack subducted sediment compositions, not ...

Increased knowledge of stock mixing and migration of Atlantic bluefin tuna (Thunnus thynnus) is required to properly manage and conserve declining populations. Here, we predicted the nursery origin of giant bluefin tuna (n = 224) present in samples from Canadian waters using stable d13C and d18O isotopes in otoliths. The isotopic composition of milled otolith cores (corresponding to the first y...

Let T =A∪B ∪C be an alphabet that is partitioned into three subalphabets. Themixing product of a word g over A ∪B and of a word d over A ∪C is the set of words w over T such that its projection onto A ∪ B gives g and its projection onto A ∪ C gives d. Let R be a regular language over T such that xbcy is in R if and only if xcby is in R for any two letters b in B and c in C. In other words, R is...

Research on root community structure is currently limited by the methodologies available. We evaluated a molecular-sequence-based approach to quantify the relative abundance of roots from different plant species in mixed samples. We extracted DNA from mixtures of roots, amplified the trnL intron by polymerase change reaction, and identified up to 60 clones from each mixture. We tested the effec...

Soit P une matrice bistochastique de taille n, et Π permutation n. Dans cet article, nous intéressons au temps mélange la chaîne Markov dont transition est donnée par Q=PΠ. En d’autres termes, alterne entre des sauts aléatoires gouvernés déterministes Π. Nous montrons que si choisie uniformément hasard, alors, sous légères hypothèses sur P, avec grande probabilité, Q présente un cutoff logn h, ...