CHEMOSPHERE
·
2016
·
IF 3.698
Xuexia Zhu,Yunfei Sun,Xingxing Zhang,Hailu Heng,Haihong Nan,Lu Zhang,Yuan Huang,Zhou Yang
The extensive application of herbicides has led to a serious threat of herbicide contamination to aquatic ecosystem . Herbicide exposure affects aquatic communities not only by exerting toxicity on single species but also by changing interspecific interactions . This study investigated the antigrazer defenses of the common green alga Scenedesmus obliquus against different herbicides [glyphosate, 2,4-dichlorophenoxyacetic acid (2,4-D), and atrazine] at various concentrations (0–2.0 mg L −1 ). In the presence of grazer ( Daphnia )-derived cues, S. obliquus populations without herbicides formed high proportions of multicelled (e.g., four- and eight-celled) colonies. This result confirms that S. obliquus exhibits a morphological defense against grazing risk. At the low concentration range of 0.002–0.02 mg L −1 , the three herbicides exerted no influence on the growth and photosynthetic efficiency of S. obliquus , and multicelled colonies showed constant proportions. At the high concentration range of 0.20–2.0 mg L −1 , atrazine significantly inhibited the algal growth and photosynthesis whereas glyphosate or 2,4-D did not. Nonetheless, these levels of glyphosate or 2,4-D remarkably decreased the proportion of multicelled colonies, with reduced numbers of cells per particle in Daphnia filtrate-treated population. No eight-celled colony was formed after treatment with atrazine at 0.20–2.0 mg L −1 despite the addition of Daphnia filtrate. These results suggest that herbicide exposure impairs antigrazer colonial morphs in phytoplankton although it is not sufficient to hamper algal growth. This phenomenon can increase the risk of predation by herbivores, thereby disrupting the inducible phytoplankton community. Furthermore, the predator-prey interactions between herbivores and phytoplankton can be potentially changed more seriously than previously considered.
研究领域:
生态学
·
水生生物学
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DOI
PubMed
高影响因子
ENVIRONMENTAL RESEARCH
·
2023
·
IF 8.3
Yue Wang,Weihao Ning,Shengnan Li,Changfei Gao,Rong Cui,Wanqian Guo,Jo-Shu Chang,Shih-Hsin Ho
The wide use of antibiotics in aquaculture has triggered global ecological security issue. Microalgal bioremediation is a promising strategy for antibiotics elimination due to carbon recovery, detoxification and various ecological advantages. However, a lack of understanding with respect to the corresponding regulation mechanism towards antibiotic stress may limit its practical applicability. The microalga Scenedesmus obliquus was shown to be capable of effectively eliminating ciprofloxacin (CIP), which is a common antibiotic used in aquaculture. However, the corresponding transcriptional alterations require further investigation and verification at the metabolomic level. Thus, this study uncovered the metabolomic profiles and detailed toxic and defense mechanisms towards CIP in S. obliquus using untargeted metabolomics. The enhanced oligosaccharide/polyol/lipid transport, up-regulation of carbohydrate and arachidonic acid metabolic pathways and increased energy production via EMP metabolism were observed as defense mechanisms of microalgal cells to xenobiotic CIP. The toxic metabolic responses included: (1) down-regulation of parts of mineral and organic transporters; (2) electrons competition between antibiotic and NAD during intracellular CIP degradation; and (3) suppressed expression of the hem gene in chlorophyll biosynthesis. This study describes the metabolic profile of microalgae during CIP elimination and reveals the key pathways from the perspective of metabolism, thereby providing information on the precise regulation of antibiotic bioremediation via microalgae.
研究领域:
环境科学
·
分子生物学
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产品关联
DOI
PubMed
高影响因子
ACS Omega
·
2020
·
IF 2.87
Zheng Shen,Yishan Gao,Ling Kong,Minyan Gu,Meng Xia,Wenjie Dong,Wei Zhang,Xuefei Zhou,Yalei Zhang
Amine-modified Sn-β was synthesized to improve the yield of lactic acid produced from Scenedesmus. After studying the growth of Scenedesmus, we selected Scenedesmus with the highest sugar content of 46.7% after 8 days of culture as the reaction substrate. The results showed that the yield of lactic acid from Scenedesmus was greatly increased after being catalyzed by 3-aminopropyltrimethoxysilane (APTMS)-modified Sn-β. After the pretreatment of Scenedesmus in an ice bath ultrasound, under the optimal reaction conditions (190 °C and 5 h), the yield of lactic acid reached the highest (37%). The acid–base characterization results of the catalyst confirmed that there are both Lewis acidic sites and medium-strength basic sites in the catalyst. Both of these sites can promote the hydrolysis of Scenedesmus, while the Lewis acidic sites can promote the production of lactic acid and the basic sites can effectively inhibit the production of the byproduct 5-hydroxymethylfurfural (HMF). This study proved that this amination catalyst is a useful strategy to increase the yield of lactic acid.
研究领域:
生物化学
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催化化学
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环境科学
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产品关联
DOI
PubMed
高影响因子
GREEN CHEMISTRY
·
2019
·Vol. 21
·期 12
·3413-3423
·
IF 9.405
Shun Tang,Ze Shi,Xiaohan Tang,Xiaoyi Yang
Biocrudes derived from hydrothermal liquefaction (HTL) and lipid extraction (EXT) of the high-lipid Scenedesmus were hydrotreated to investigate the influences of the feedstock on the profiles of the hydrotreating biofuels. For HTL and EXT biocrudes, similar yields were obtained (52.87% and 49.06%, wt%) but with different fatty acid (60.53% and 66.92%), C (60.28% and 74.40%), H (9.55% and 10.96%), O (26.99% and 13.81%) and N (3.19% and 0.85%) contents (wt%), HHVs (29.19 and 38.33 MJ kg−1) and chemical constituents (fatty acids and triglycerides), respectively. After hydrotreatment, 0.45 g HTL and 0.42 g EXT biofuels were obtained from 1 g Scenedesmus, with different heteroatoms (9.14% and 1.01%) and HHVs (42.77 and 48.85 MJ kg−1), respectively. However, a certain number of heavy products, such as C30+ hydrocarbons and C31+ esters, were found in both biofuels. By adjusting the reaction conditions, including the temperature and catalyst loading, the content of heavy products decreased from a maximum of 26.24% to a minimum of 1.30% at 350 °C with a 50% catalyst loading. Based on the hydrotreating model fatty acids and esters, the proposed reaction mechanism demonstrated that the formation of heavy products could be inhibited using EXT biocrude instead of HTL biocrude as the feedstock.
研究领域:
能源生物学
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环境科学
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产品关联
DOI
高影响因子
JOURNAL OF CHEMICAL TECHNOLOGY AND BIOTECHNOLOGY
·
2023
·Vol. 98
·期 4
·1014-1024
·
IF 3.4
Diantong Li,Jiayu Li,Balijiang Yeerhazi,Yongtao Cheng
BACKGROUND With the rapid development of modern industry and agriculture, large amounts of sewage of various types are being discharged into water bodies every year, causing huge environmental pressure and posing a threat to organisms. Amongst different solutions to this problem, microalgae can remove pollutants including pesticides and antibiotics from water . In this work, an algal strain designated as Scenedesmus sp. TXH. was isolated from the Tangxun Lake Sewage Treatment Plant (Wuhan, China) and used to remove imidacloprid (IMI) from sewage. The removal efficiency, degradation products, removal of conventional contaminants [total dissolved nitrogen (TDN) ammonia nitrogen (NH 4 + -N), total dissolved phosphorus (TDP)], the biochemical response of the microalgae, and the effects of environmental factors such as light intensity and temperature were investigated. RESULTS The results showed that: (i) the highest IMI removal efficiency of ≈60% was achieved under 80 μmol m −2 s −1 at 25 °C; (ii) the removal of NH 4 + -N, TDP and TDN in the sewage reached 90%, 90% and 65%, respectively; (iii) there was a significant linear relationship between the concentration of total chlorophyll and the removal of IMI in the sewage; and (iv) finally, based on the analysis of degradation products by mass spectrometer, three potential IMI degradation pathways were proposed. CONCLUSION In summary, our results showed that Scenedesmus sp. TXH can remove IMI and conventional nutrients efficiently from sewage, implying a potential application in sewage treatment in the near future. © 2023 Society of Chemical Industry (SCI).
研究领域:
环境科学
·
微生物学
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DOI
高影响因子
SCIENCE OF THE TOTAL ENVIRONMENT
·
2022
·
IF 10.753
Zhiheng Li,Jiazheng Chen,Jie Chen,Jiaojun Jin,Hanmei Chen,Huijun Liu
Due to the persistence of ionic liquids (ILs) in aquatic environments, it is necessary to reveal their ecological risk to aquatic organisms. Herein, the biotoxicity of two alkyl-methylimidazolium nitrate ILs ([C 10 mim]NO 3 and [C 12 mim]NO 3 ) against Scenedesmus obliquus were studied. Results showed that the growth inhibition of S. obliquus increased with increasing concentrations of ILs, maximum values of 94.61% at 4 mg/L of [C 10 mim]NO 3 and 97.34% at 0.8 mg/L of [C 12 min]NO 3 were observed. The fluorescence parameters of photosystem II, such as light quantum yield and electron transfer rate, showed a negative relationship with the exposure dose. [C 12 mim]NO 3 had a more significant effect than [C 10 mim]NO 3 . Moreover, the redox homeostasis of algae was disrupted; the accumulation of reactive oxygen species , leading to obvious inhibition of superoxide dismutase and catalase activities was observed. A metabolomic analysis indicated that the contents of most metabolites were reduced significantly, and fructose and galactose decreased significantly by 42.3% and 88.6%, respectively, in the [C 10 mim]NO 3 treatment compared to those in the control. The inhibition of amino acid biosynthesis and glyoxylate and dicarboxylate metabolism explained the more serious biotoxicity of [C 12 mim]NO 3 than that of [C 10 mim]NO 3 . This study facilitates a better understanding of the environmental safety and ecological risks of ILs.
研究领域:
环境科学
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植物生理学
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产品关联
DOI
PubMed
高影响因子
SCIENCE OF THE TOTAL ENVIRONMENT
·
2022
·
IF 10.753
Xuanhe Jia,Yueqiang Pan,Xuexia Zhu
Driven by anthropogenic activities, freshwater salinization has become an emerging global environmental issue . Recent studies indicate that salinization increases the mobility of heavy metals in soil and causes higher flux into surface waterbodies. The present study assessed the combined effects of salinization (0, 3, 6 PSU) and the heavy metal Cd 2+ (0, 0.2, 0.4 mg L −1 ) on the anti-grazing colony formation and population growth of Scenedesmus obliquus , a common freshwater alga. The results showed that the increase in salinity promoted colony formation of S. obliquus with or without the presence of grazing cues and, in contrast, Cd 2+ contamination depressed the defensive colony formation of S. obliquus to Daphnia filtrate. The increase in both salinity and Cd 2+ concentration depressed the population growth of S. obliquus , including impaired photosynthesis and a decreased population growth rate. Salinization moderated the negative effects of Cd 2+ on defensive colony formation of S. obliquus , suggesting increased absorption of Cd 2+ ions by a thicker outer layer of the algal cell wall under saltier conditions. As a result, larger defensive colonies of S. obliquus under freshwater salinization may cause higher bioaccumulation of heavy metals by algal cells and heavier influence on zooplankton. This study provides evidence that freshwater salinization could interfere with plankton interactions by affecting algal defense and growth, which may lead to bottom-up cascading effects on freshwater food webs.
研究领域:
生态学
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环境科学
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产品关联
DOI
PubMed
高影响因子
Journal of Environmental Chemical Engineering
·
2024
·
IF 7.4
Yuxin Zhou,Di Zhu,Yan Peng,Yiming Zhu,Yongni Shao
This study introduces a novel approach for the rapid detection of exchangeable heavy metal pollution in soil, utilizing Scenedesmus obliquus as a bioadsorbent. Terahertz spectroscopy was used to analyze the cell wall proteins and functional groups of S. obliquus following physical adsorption. This analysis enabled the deduction of the types and concentrations of exchangeable heavy metal ions in soil. We established a prediction model for heavy metal concentrations using partial least squares (PLS) regression, achieving optimal detection times: 10 min for Pb 2+ , 20 min for Ni 2+ , and 30 min for Co 2+ . Validation with real surface soil samples demonstrated excellent accuracy rates: 97.8 % for Pb 2+ , 91.8 % for Ni 2+ , and 90 % for Co 2+ . Notably, our method reduces the detection time to 0.5 hours, requires only 5 ml of sample volume, and enhances detection accuracy to 0.1 μg/L.
研究领域:
环境科学
·
生物学
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产品关联
DOI
高影响因子
JOURNAL OF HAZARDOUS MATERIALS
·
2023
·
IF 13.6
Jie-Ru Jiang,Zhi-Feng Chen,Xiao-Liang Liao,Qian-Yi Liu,Jia-Ming Zhou,Shi-Ping Ou,Zongwei Cai
Tire wear particles (TWPs) are increasingly being found in the aquatic environment. However, there is limited information available on the environmental consequences of TWP constituents that may be release into water. In this study, TWP leachate samples were obtained by immersing TWPs in ultrapure water. Using high-resolution mass spectrometry and toxicity identification, we identified potentially toxic organic substances in the TWP leachates. Additionally, we investigated their toxicity and underlying mechanisms. Through our established workflow, we structurally identified 13 substances using reference standards. The median effective concentration (EC 50 ) of TWP leachates on Scenedesmus obliquus growth was comparable to that of simulated TWP leachates prepared with consistent concentrations of the 13 identified substances, indicating their dominance in the toxicity of TWP leachates. Among these substances, cyclic amines (EC 50 : 1.04–3.65 mg/L) were found to be toxic to S. obliquus . We observed significant differential metabolites in TWP leachate-exposed S. obliquus , primarily associated with linoleic acid metabolism and purine metabolism. Oxidative stress was identified as a crucial factor in algal growth inhibition. Our findings shed light on the risk posed by TWP leachable substances to aquatic organisms.
研究领域:
环境科学
·
毒理学
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产品关联
DOI
PubMed
高影响因子
Scientific Reports
·
2017
·Vol. 7
·期 1
·1-12
·
IF 4.259
He Meilin,Yan Yongquan,Pei Feng,Wu Mingzhu,Gebreluel Temesgen,Zou Shanmei,Wang Changhai
Carbon nanotubes (CNTs), α-Fe 2 O 3 nanoparticles (nano Fe 2 O 3 ) and MgO nanoparticles (nano MgO) were evaluated for the effects on algae growth and lipid production. Nano Fe 2 O 3 promoted cell growth in the range of 0–20 mg·L −1 . CNTs, nano Fe 2 O 3 and nano MgO inhibited cell growth of Scenedesmus obliquus at 10, 40 and 0.8 mg·L −1 respectively. Neutral lipid and total lipid content increased with the increasing concentration of all tested nanoparticles. The maximum lipid productivity of cultures exposed to CNTs, nano Fe 2 O 3 and nano MgO was observed at 5 mg·L −1 , 5 mg·L −1 and 40 mg·L −1 , with the improvement by 8.9%, 39.6% and 18.5%. High dose exposure to nanoparticles limited increase in lipid productivity, possibly due to the repression on cell growth caused by nanoparticles-catalyzed reactive oxygen species (ROS) generation, finally leading to reduction in biomass and lipid production. Reduced accumulation of fatty acids of C18:3n3, C18:3n6 and C20:2 was observed in cells exposed to nanoparticles.
研究领域:
微生物学
·
生物技术
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产品关联
DOI
PubMed
高影响因子
BULLETIN OF ENVIRONMENTAL CONTAMINATION AND TOXICOLOGY
·
2025
·Vol. 114
·期 2
·1-9
·
IF 2.2
Lin Shutao,Shi Chunhai,Wang Haimei,Ma Xiaoli,Li Jian,Chen Siqin,Guo Niuniu,Zhang Zhi
Ciprofloxacin (CIP) and oxytetracycline (OTC) are commonly detected antibiotic species in breeding wastewater, and microalgae-based antibiotic treatment technology is an environmentally friendly and cost-effective method for its removal. This study evaluated the effects of CIP and OTC on Scenedesmus sp . in the breeding wastewater tailwater and the removal mechanisms of antibiotics. The results showed that Scenedesmus sp could increase antibiotic tolerance by enhancing antioxidant system activity. Compared to CIP, Scenedesmus sp showed better performance for OTC removal, the removal efficiencies were 100%, 96.87%, 95.75%, 90.18% and 83.91% at 0.1, 0.5, 1, 5, and 10 mg L − 1 OTC, respectively. The removal routes indicated that CIP was mainly removed by biodegradation (38.88%) and photolysis (14.30%) whereas OTC was mainly removed by hydrolysis (43.47%) and biodegradation (33.45%). Product toxicity predictions showed that most of the degradation products of CIP and OTC were less toxic than their parent compounds, confirming the feasibility of microalgae biotreatment for antibiotic removal.
研究领域:
环境科学
·
微生物学
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DOI
PubMed
高影响因子
APPLIED MICROBIOLOGY AND BIOTECHNOLOGY
·
2019
·Vol. 103
·期 14
·5907-5916
·
IF 3.67
Qiu Yongting,Wang Zhihong,Liu Feng,Liu Junxia,Tan Kaiting,Ji Ruibo
Allelopathy by hydrophytes can be utilized to control algal blooms. This study was conducted to investigate the allelopathic effect (inhibition) of Scenedesmus quadricauda on Microcystis flos-aquae . When M. flos-aquae was co-cultured with S. quadricauda , the secretion of high-MW biopolymer by M. flos-aquae was inhibited by S. quadricauda . We further identified the allelochemicals and found that 4-tert-butylpyrocatechol (TBC) was the main active ingredient that could inhibit the growth of M. flos-aquae . When the dose of TBC was larger than 0.2 mg/L, almost all of the M. flos-aquae died. Additionally, TBC was found to suppress the growth of M. flos-aquae by disturbing the synthesis and secretion of proteins and polysaccharides and harming the chlorophyll to affect the light harvesting of algal cells. Therefore, TBC has the potential for use as a potential and promising algaecide to restrain the biomass of M. flos-aquae .
研究领域:
水生生物学
·
环境微生物学
·
化学生态学
·
藻类生理学
·
生物防治
✓ 已验证
DOI
高影响因子
危险品化学品经营许可证（带存储）