SCIENCE OF THE TOTAL ENVIRONMENT
·
2017
·
IF 4.9
Cui Zhang,Jian Lu,Jun Wu,Yongming Luo
Ulva prolifera ( U. prolifera ) has been frequently involved in terrible algal proliferation in coastal areas. Although it is known to be associated with green tide, its contribution to the natural attenuation of the polycyclic aromatic hydrocarbons (PAHs) in seawater has not been evaluated. In this study, the removal of phenanthrene using U. prolifera collected from coastal water with green tide blooming was investigated. The results showed that phenanthrene could be removed efficiently in the presence of both the live and heat-killed U. prolifera . The phenanthrene concentrations of the live algae treatment decreased smoothly from 10.00 to 0.80 μg L − 1 through the whole process, while those of the heat-killed algae treatment decreased sharply from 10.0 to 2.71 μg L − 1 in one day and kept constantly after that. The in situ monitoring and visualizing using laser confocal scanning microscopy (LCSM) confirmed the accumulation of phenanthrene in U. prolifera . The increase in nutrient and temperature led to the increase of phenanthrene removal rate, while the salinity had less influence on the removal of phenanthrene. The removal efficiency by U. prolifera had a good linear relationship with phenanthrene initial concentration (r 2 = 0.999) even at 100 μg L − 1 which was higher than its environmentally relevant concentrations. High removal efficiency (91.3%) was observed when the initial phenanthrene concentration was set at environmental relevant concentration (5 μg L − 1 ). Results of this study demonstrate a potential new natural attenuation process for typical PAHs in coastal water during the outbreak of green tide. These findings indicate that the outbreak of harmful green tide algae may bring positive environmental benefits in the terms of the removal of harmful organic pollutants from coastal waters.
研究领域:
环境科学
·
海洋生物学
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DOI
PubMed
高影响因子
WATER RESEARCH
·
2025
·
IF 12.4
Xinyu Li,Cui Zeng,Xiurong Han,Liqiang Fan,Jing Zhao,Yingzhe Wang,Xiulin Wang,Keqiang Li
Multitudinous dissolved organic nitrogen (DON) enters seawater from Ulva prolifera green tides impacting phytoplankton community structure in the Yellow Sea. Field investigations and cultural experiments on U. prolifera -derived DON aging revealed its regulatory effects. The green-tide outbreak area of the Southern Yellow Sea exhibits a seasonal cycle where dominance shifts from diatoms to dinoflagellates effected by young to aging U. prolifera -derived DON from summer to spring. Diatom abundance rose significantly following the summer green tide outbreak, fueled by young, protein-rich DON released by U. prolifera . After autumn and winter aging, U. prolifera -derived DON was dominant from protein-like to humic-like components, and dinoflagellates bloomed in the green tide outbreak area. An aging U. prolifera -derived DON adding culture experiment of Chaetoceros curvisetus and Prorocentrum minimum proved that old and young DON promoted dinoflagellate and diatom growth, respectively. Diatoms preferred 0 and 12 days-aged DON (DON 0 and DON 12 ) with tyrosine B and tryptophan T components, whereas dinoflagellate favored 80 days-aged DON (DON 80 ) with humic acid E and UV fulvic acid A components. DON 0 and DON 12 can be absorbed by diatoms with higher uptake ( k up ) and growth ( k G ) constants than by dinoflagellates under low leucine aminopeptidase (LAP) conditions. Dinoflagellates absorb old DON with higher k up and k G values under higher LAP concentrations than diatoms. This was consistent with the loop of U. prolifera -derived DON turning over the seasonal succession of diatom dinoflagellates in the green-tide outbreak area. This study revealed mechanism of seasonal dinoflagellate- U. prolifera -diatom cycle, and provided new insights for impacts of U. prolifera green tides on phytoplankton regime shift, thus, acting as a basis for marine management strategies.
研究领域:
海洋生物学
·
生态学
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DOI
PubMed
高影响因子
POLYMER COMPOSITES
·
2020
·Vol. 42
·期 4
·1712-1726
·
IF 2.265
Zhichao Zhang,Xin Liu,HuiXin Wang,HaiFeng He,Ruiqin Bai
Due to the frequent occurrence of Enteromorpha prolifera “green tide” in recent years, how to solve the ecological disaster brought by the green tide and make maximal use of the Enteromorpha prolifera have become an urgent problem. In order to realize the resource utilization of marine biomass, we extract nanofibrillated cellulose (NFC) with high aspect ratio from Enteromorpha prolifera . Filamentous NFC is successfully extracted at nanometric scale with a diameters range of 20 ~ 40 nm, a length of several microns, and a crystallinity index of 57.2%. Then NFC/polyvinyl alcohol (PVA) composite films were prepared with NFC as fillers. In addition, for comparison, nanocrystals cellulose (NCC) with small aspect ratio was isolated from microcrystalline cellulose (MCC) to prepare NCC/PVA composite films. It is shown that because Enteromorpha prolifera ta NFC has a higher aspect ratio, it is easier to interpenetrate with PVA to form a dense network, and the lower concentration ensures the better dispersion of NFC in the matrix, so its enhancement effect on PVA composite films is better than that of NCC. When the NFC content was 0.1 wt %, the light transmittance of NFC/PVA composite film could reach more than 94%, and the swelling degree was 250%, which is 29% lower than that of the pure PVA film, the water resistance was improved. At the same time, the tensile strength, elastic modulus and toughness were 99.1%, 1547% and 117.9% respectively, which are higher than those of PVA.
研究领域:
材料科学
·
海洋生物学
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DOI
高影响因子
Science China-Earth Sciences
·
2016
·Vol. 60
·期 2
·391-396
·
IF 1.655
Li Jing,Sun Lei,Yu ZhiMing,Song XiuXian
Prevention of annual “green tides” caused by blooms of the green macroalga Ulva prolifera , which have occurred in the Yellow Sea since 2007, has received much attention. Increasing evidence indicates that micro-propagules on the rafts used for Porphyra yezoensis aquaculture along the coastline of Jiangsu Province in China, were the primary source of these green tides. In this study, we investigated the effectiveness of a silicone antifouling coating for preventing the adhesion and germination of U. prolifera micro-propagules on bamboo and nylon ropes, which have been used in rafts for P. yezoensis aquaculture. Our results demonstrated that a coating of silicone (Sylgard 184) containing 1.0 wt.% sodium benzoate (NaB) could reduce the adhesion rate to <5% and completely inhibited the growth of U. prolifera propagules on the coated surfaces. Coating bamboo and nylon ropes with NaB-incorporated silicone thus proved a potentially effective method for controlling the initial biomass accumulation of U. prolifera .
研究领域:
海洋生物学
·
环境科学
·
水产养殖
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DOI
高影响因子
SENSORS AND ACTUATORS B-CHEMICAL
·
2020
·
IF 7.1
Han Ren,Xuan Liu,Lu Yan,Yuanyuan Cai,Chongyang Liu,Lingxing Zeng,Aihua Liu
The hierarchical porous carbon with high specific surface area was facilely synthesized by calcination of Enteromorpha prolifera (EP), a renewable ocean waste biomass. The resultant carbon exhibited bienzyme mimetic properties including oxidase-like and peroxidase-like activities, which can be regulated by varying carbonized temperature. The reaction mechanism of the oxidase-like activity of EP-based hierarchical porous carbon (EPC) contributes to singlet oxygen and superoxide anions generated during the reaction, while the peroxidase-like activity arises from hydroxyl radicals. Finally, a sensitive colorimetric biosensor for acid phosphatase was explored based on the oxidase-like activity, demonstrating a linear range of 0.5–15 U/L and the limit of detection (LOD) of 0.1 U/L (S/N = 3). A fluorescent biosensor for H 2 O 2 was also developed with the linear range of 0.05–80 μM and a LOD of 0.017 μM (S/N = 3), based on OH produced with the peroxidase-like activity, which react with terephthalic acid to form 2-hydroxyterephthalic acid. Further, incorporated with glucose oxidase, fluorometric sensing of glucose was realized with the linear range of 0.05–10 mM and a LOD of 30 μM. The bi-enzyme mimics also exhibited high reproducibility and stability. Thus, this EPC can be promising candidates for broad applications in sensing, nanomedicine, industrial catalysis and environmental engineering.
研究领域:
生物材料学
·
分析化学
·
环境科学
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DOI
高影响因子
危险品化学品经营许可证（带存储）