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Jiang S.,Xiamen University | Jiang S.,Trinity College Dublin | Lu H.,Xiamen University | Zhang Q.,Xiamen University | And 3 more authors.
Marine Pollution Bulletin | Year: 2015

As land-ocean interaction zones, mangrove systems receive substantial polycyclic aromatic hydrocarbons (PAHs) from sewage and combustion of fossil fuel. In this study, we investigated the relationship between dissolved inorganic nitrogen (DIN) availability and degradation rate of phenanthrene, a typical PAH compound, in mangrove plant-sediment systems, using Avicennia marina as a model plant. After 50. day incubation, phenanthrene removal ratios in sediments ranged from 53.8% to 97.2%. In non-rhizosphere sediment, increasing DIN accessibility increased microbial biomass and total microbial activity, while enhancements in population size of phenanthrene degradation bacteria (PDB) and phenanthrene degradation rates were insignificant. In contrast, the presence of excessive DIN in rhizosphere sediment resulted in a significantly large number of PDB, leading to a rapid dissipation rate of phenanthrene. The differences in degradation rates and abundances of degrader in sediment may be explained by the enhanced root activity due to the elevation in DIN accessibility. © 2015 Elsevier Ltd.

Xiaowei L.,Minnan Normal University | Jianjun L.,Jiangxi Normal University
BioTechnology: An Indian Journal | Year: 2014

In order to solve some bottleneck problems such as slow countersign flow, inconvenient contract storage, high management costs in traditional contract, this paper defined the concept of digital contract from the two perspectives of technology and user experience. Analyzed the innovative features of digital contract which are different from the paper contract and the electronic contract. And then put forward the business architecture and system architecture of the digital contract countersign service platform oriented to supply chain market. Finally, discussed the key technologies for implementing the digital contract countersign service platform. © Trade Science Inc.

Li S.,Minnan Normal University | Li S.,Fujian Normal University | Chen D.,Minnan Normal University | Zheng F.,Minnan Normal University | And 4 more authors.
Advanced Functional Materials | Year: 2014

Here, a new class of quantum dots, that is, sulphur quantum dots (SQDs), which are synthesized by the phase interfacial reaction, is reported. The prepared SQDs are monodisperse with a narrow size distribution (average 1.6 nm in size), excellent aqueous dispersibility, ultrahigh photostability, and lowly toxicity. Because of abundant oxidized sulphur species on the surface of SQDs, the incorporation of TiO2 with SQDs results in a synergistic effect for the TiO2-based photocatalysts offering more effective environmental applications. It is demonstrated that SQDs-TiO2 nanocomposite can enhance the photocatalytic activity of producing hydrogen (enhancement factor for 191) in methanol-water system. The SQDs also can used as fluorescent probe for highly selective quantitative detection Fe3+ in an aqueous solution contained various metal ions. © 2014 Wiley-VCH Verlag GmbH & Co. KGaA.

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