A Gram-stain-negative, non-motile and rod-shaped bacterium, designated as strain W52T, was isolated from deep seawater of the Mariana Trench and characterized phylogenetically and phenotypically. The strain could grow at 10–47 °C (optimum 32 °C), at pH 5.0–8.0 (optimum 6.0) and with 0–9% NaCl (optimum 3 %, w/v). The results of phylogenetic analysis based on 16S rRNA gene sequences indicated that W52T was related to members of the genus Muricauda and shared the highest identity with Muricauda oceani 501str8T (99.0 %), followed by Muricauda aquimarina JCM 11811T, Muricauda ruestringensis DSM 13258T, Muricauda oceanensis 40DY170T, Muricauda beolgyonensis KCTC 23501T and Muricauda zhangzhouensis 12C25T with 97.0–98.8 % sequence similarity. 16S rRNA gene sequence identities between W52T and other members of the genus Muricauda were below 97.0 %. The major respiratory quinone was MK-6. The polar lipids were phosphatidylethanolamine (PE), one unidentified aminolipid and three unidentified lipids. The strain had iso-C15 : 0, iso-C17 : 0 3-OH and iso-C15 : 1G as the major fatty acids. The G+C content of the genomic DNA was 41.7 %. The combined genotypic and phenotypic data indicated that strain W52T represents a novel species of the genus Muricauda , for which the name Muricauda abyssi sp. nov. is proposed, with the type strain W52T (=MCCC 1K05111T= KCTC 82315T).

Active distribution network is an important scheme to make the distribution network safer, more reliable and more economical in the environment of distributed power development. It is an important part of smart grid. Scholars at home and abroad have put forward many key technologies. This paper expounds the key technologies of active distribution network from four aspects of active distribution network planning access, active distribution network control, fault recovery and load control Research status, and then compared its advantages and disadvantages, finally introduced the application prospects.

The independent microgrid with high-permeability distributed generation is greatly constrained by the natural environment and economy, and lacks the support of large grid in operation. At the same time, the large-scale use of power electronic equipment such as converter will cause its stability problem to have new characteristics compared with the traditional grid, and therefore become the key of research. This paper summarizes the characteristics of microgrid stability, points out the problems existing in applying the traditional definition of power system stability to microgrid, and gives the definition and classification of the stability of the independent microgrid with high permeability DGS; reviews the analysis methods of microgrid stability from three aspects of signal stability, transient stability and voltage stability respectively; discusses the guarantee of microgrid stability The control method of signal stability and the technical measures to improve the transient stability of the microgrid are discussed. Finally, the key problems of the stability of the independent microgrid with high permeability distributed generation that need further study are summarized and prospected.

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