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Probabilistic approaches to rough sets are still an important issue in rough set theory. Although many studies have been written on this topic, they focus on approximating a crisp concept in the universe of discourse, with less effort on approximating a fuzzy concept in the universe of discourse. This article investigates the rough approximation of a fuzzy concept on a probabilistic approximation space over two universes. We first present the definition of a lower and upper approximation of a fuzzy set with respect to a probabilistic approximation space over two universes by defining the conditional probability of a fuzzy event. That is, we define the rough fuzzy set on a probabilistic approximation space over two universes. We then define the fuzzy probabilistic approximation over two universes by introducing a probability measure to the approximation space over two universes. Then, we establish the fuzzy rough set model on the probabilistic approximation space over two universes. Meanwhile, we study some properties of both rough fuzzy sets and fuzzy rough sets on the probabilistic approximation space over two universes. Also, we compare the proposed model with the existing models to show the superiority of the model given in this paper. Furthermore, we apply the fuzzy rough set on the probabilistic approximation over two universes to emergency decision-making in unconventional emergency management. We establish an approach to online emergency decision-making by using the fuzzy rough set model on the probabilistic approximation over two universes. Finally, we apply our approach to a numerical example of emergency decision-making in order to illustrate the validity of the proposed method. [ABSTRACT FROM AUTHOR]

The first complete mitochondrial genome of the wolf-eel (Anarrhichthys ocellatus) was determined and analyzed in this work. It had a circular mapping molecular with the length of 16,506 bp and contained 12S and 16S rRNAs, 22 tRNAs, 13 protein-coding genes, and a 851 bp D-loop in the typical arrangement of the vertebrate consensus. Phylogenetic analysis of the mitochondrial genome sequences of 47 representative species within the order Perciformes suggests that A. ocellatus is closely related to the species in the family Anarhichadidae. Anarrhichthys ocellatus mitogenome can contribute to our understanding of the phylogeny and evolution of this species. [ABSTRACT FROM AUTHOR]