The genus Serratia belongs to the family Enterobacteriaceae of the class Gammaproteobacteria. Some members of the genus Serratia have clinical importance (Grimont & Grimont, 1992;Brenner, 1984) and other members produce pigments identified as prodigiosin (Hearn et al., 1970;Gerber, 1975). A subspecies of Serratia marcescens (S. marcescens subsp. sakuensis) and a urea-dissolving species (Serratia ureilytica) have been described previously by Ajithkumar et al. (2003) and Bhadra et al. (2005), respectively. In this paper, a red-pigmented, non-sporeforming, fluorescent strain, designated DZ0503SBS1 T , was isolated from the intestine of the nematode Heterorhabditidoides chongmingensis (Zhang et al., 2008).The novel strain was associated symbiotically with the entomopathogenic nematode H. chongmingensis (Rhabdi3These authors contributed equally to this work.The GenBank/EMBL/DDBJ accession number for the 16S rRNA gene sequence of strain DZ0503SBS1 T is EU036987.A neighbour-joining phylogenetic tree based on partial rpoB gene sequences, a fluorescence micrograph showing the location of strain DZ0503SBS1 T in the intestine of the nematode Heterorhabditidoides chongmingensis, a transmission electron micrograph of strain DZ0503SBS1 T , cellular fatty acid composition data and similarity coefficient values of strain DZ0503SBS1T and related taxa are available with the online version of this paper.

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Quantum heat transfer is analyzed in nonequilibrium two-qubits systems by applying the nonequilibrium polaron-transformed Redfield equation combined with full counting statistics. Steady state heat currents with weak and strong qubit-bath couplings are clearly unified. Within the two-terminal setup, the negative differential thermal conductance is unraveled with strong qubit-bath coupling and finite qubit splitting energy. The partially strong spin-boson interaction is sufficient to show the negative differential thermal conductance. Based on the three-terminal setup, that two-qubits are asymmetrically coupled to three thermal baths, a giant heat amplification factor is observed with strong qubit-bath coupling. Moreover, the strong interaction of either the left or right spin-boson coupling is able to exhibit the apparent heat amplification effect. * Electronic address:

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Antibiotics are the most powerful weapon against bacterial infectious diseases in aquaculture. However, the indiscriminate usage of antibiotics often culminates in the emerging development of antibiotic‐resistant bacteria, making it imperative to search for novel types of antimicrobial agents. This study investigated the antibacterial and antivirulence effects of vanillic acid (VA) against the fish pathogen, Vibrio alginolyticus. We showed that VA had a good anti‐Vibrio activity with minimal inhibitory concentration (MIC) of 1.0 mg/ml. In addition, VA wielded its antibacterial action in a dose‐/time‐dependent manner by causing cell membrane damage and increasing membrane permeability, which is evidenced by increasing the conductivity and malondialdehyde content in the treated cell cultures and the scanning electron microscopy images. Furthermore, VA significantly reduced the biofilm‐forming capability, mobility and exotoxin production (protease and exopolysaccharide) and downregulation of the expression of biofilm‐ and virulence‐associated genes (sypG, fliS, fliK, lafA, lafK, asp and luxR) was seen in the V. alginolyticus that exposed to VA at subinhibitory concentrations. Overall, our findings suggested that VA may be of interest for treating V. alginolyticus‐associated infections in aquaculture.

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