ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH
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2021
·Vol. 29
·期 7
·9780-9791
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IF 4.223
Huang Wenqiu,Zhou Yuping,Zhao Ting,Tan Liju,Wang Jiangtao
In this study, the marine microalgae Skeletonema costatum and Nitzschia closterium were exposed to different forms of copper, such as a metal salt (Cu 2+ ), a nano-metal (nano-Cu), and nano-metal oxide (nano-CuO). During a 96-h exposure to nanoparticles (NPs) and salt, the cell number, Cu 2+ concentration in the culture medium, morphology, and intracellular amino acids were measured to assess the toxicity of the copper materials and the toxicity mechanism of the NPs. As results, the toxicity of Cu 2+ , nano-Cu, and nano-CuO to marine phytoplankton decreased in order. The EC 50 values of Cu 2+ and nano-Cu for S. costatum and N. closterium ranged from 0.356 to 0.991 mg/L and 0.663 to 2.455 mg/L, respectively. Nano-Cu inhibits the growth of marine phytoplankton by releasing Cu 2+ ; however, nano-CuO is harmful to microalgae because of the effect of NPs. The secretion of extracellular polymeric substances by microalgae could also affect the toxicity of nano-Cu and nano-CuO to microalgae. S. costatum was more sensitive to copper than N. closterium . Cu 2+ , nano-Cu, and nano-CuO all reduced per-cell amino acids and the total output of algae-derived amino acids by affecting the growth of the phytoplankton. This study helps to understand the risk assessment of nano-Cu and nano-CuO to marine microalgae.
研究领域:
海洋生物学
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环境科学
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生态毒理学
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DOI
PubMed
高影响因子
JOURNAL OF ENVIRONMENTAL MANAGEMENT
·
2023
·
IF 8.7
Dongyang Liu,Hanzhi Wang,Yue Teng,Qirui Wu,Chunming Tang,Xinxin Gao,Chaoqi Chen,Liandong Zhu
With the development of livestock industry , contaminants such as divalent zinc ions (Zn (Ⅱ)) and estrone are often simultaneously detected in livestock wastewater. Nevertheless, the combined toxicity of these two pollutants on microalgae is still unclear. Moreover, microalgae have the potential for biosorption and bioaccumulation of heavy metals and organic compounds. Thus, this study investigated the joint effects of Zn (Ⅱ) and estrone on microalgae Chlorella sorokiniana , in terms of growth, photosynthetic activity and biomolecules , as well as pollutants removal by algae. Interestingly, a low Zn (Ⅱ) concentration promoted C . sorokiniana growth and photosynthetic activity, while the high concentration experienced inhibition. As the increase of estrone concentration, chlorophyll a content increased continuously to resist the environmental stress. Concurrently, the secretion of extracellular polysaccharides and proteins by algae increased with exposure to Zn (Ⅱ) and estrone, reducing toxicity of pollutants to microalgae. Reactive oxygen species and superoxide dismutase activity increased as the increase of pollutant concentration after 96 h cultivation, but high pollutant concentrations resulted in damage of cells, as proved by increased MDA content. Additionally, C. sorokiniana displayed remarkable removal efficiency for Zn (Ⅱ) and estrone, reaching up to 86.14% and 84.96% respectively. The study provides insights into the biochemical responses of microalgae to pollutants and highlights the potential of microalgae in pollutants removal.
研究领域:
环境科学
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生物化学
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DOI
PubMed
高影响因子
APPLIED BIOCHEMISTRY AND BIOTECHNOLOGY
·
2025
·
IF 3.3
Wang Yanyan,Peng Yu,Zhu Huan,Zhou Wenjun,Bi Yonghong,Chen Lin,Liu Tianzhong
High-ammonium wastewater can be simultaneously remediated and valorized through phototrophic cultivation of stress-resilient microalgae. This study evaluated the growth performance of 16 microalgae strains (specific growth rate μ = 0.108–0.217 day −1 ) from different terrestrial habitats, recognizing that there is a high diversity of terrestrial microalgae, which could harbor species with unique metabolites and properties, among which Tribonema arborum HJX, Cephaleuros virescens LST0102, and Cephaleuros virescens 42.85 exhibited high biomass productivity, reaching up to 190.6 mg L −1 day −1 . Tribonema arborum HJX demonstrated the highest production of lipids and carotenoid, with a total of 46.9 and 2.51 mg L −1 day −1 , respectively. The tolerance of these strains to ammonium and low pH, along with their performance in a 10-L panel PBR, was then assessed. The results revealed that filamentous algae isolated from terrestrial habitats have significant potential for the co-production of lipids and carotenoids, as well as robust growth capabilities under high-ammonium and low-pH environmental stress. This study highlights the potential of terrestrial filamentous algae in co-producing high-value chemicals with high-ammonium wastewater.
研究领域:
微生物学
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生物技术
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环境科学
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藻类学
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生物工程
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DOI
PubMed
高影响因子
TRENDS IN MICROBIOLOGY
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2022
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IF 18.23
Noreen Ashraf,Fiaz Ahmad,Yandu Lu
Microalga–microbiome interactions are central to both health and disease of aquatic environments. Despite impressive advances in deciphering how microorganisms participate in and impact aquatic ecosystems, the evolution and ecological involvement of microalgae and the microbiome in polluted waters are typically studied independently. Here, the phycosphere (i.e., the consortia of microalgae and the related microbiome) is regarded as an independent and integrated life form, and we summarize the survival strategies exhibited by this symbiont when exposed to anthropogenic pollution. We highlight the cellular strategies and discuss the modulation at the transcriptional and population levels, which reciprocally alters community structure or genome composition for medium-term acclimation or long-term adaptation. We propose a ‘PollutantBiome’ concept to help the understanding of microalga–microbiome interactions and development of beneficial microbial synthetic communities for pollutant remediation.
研究领域:
环境科学
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微生物学
✓ 已验证
DOI
PubMed
高影响因子
JOURNAL OF AGRICULTURAL AND FOOD CHEMISTRY
·
2024
·
IF 5.7
Junwei Huang,Zilin Zhu,Ruomu Chen,Dandan Pan,Qing X. Li,Xiangwei Wu
Ibuprofen, a widely used nonsteroidal anti-inflammatory drug, contaminates agricultural products and potentially threatens human health due to its frequent detection and poor biodegradability. Microbial metabolism dominates the elimination of residual ibuprofen in the environment. In mineral salt medium at pH 6 with 5 mM glucose, Streptomyces sp. D218 transformed ibuprofen concentrations ranging from 0.05 to 0.40 mM in 24 h. The optimal temperature, pH, and initial OD600 nm for ibuprofen transformation by strain D218 were 25–37 °C, 5.0–6.0, and 1.0–1.5, respectively. Strain D218 could simultaneously transform ibuprofen into the intermediates 2-hydroxyibuprofen and ibuprofen amide (IBUA). The two intermediates were further metabolized to 2-hydroxyibuprofen amide (2HIBUA), thus relieving the growth inhibition of ibuprofen in Scenedesmus obliquus. This is the first complete pathway reported for the detoxification of ibuprofen transformation by a Gram-positive strain. These findings further our understanding of the microbial catabolism of the IBU.
研究领域:
环境微生物学
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药物代谢
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生态毒理学
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产品关联
DOI
PubMed
高影响因子
BIORESOURCE TECHNOLOGY
·
2019
·
IF 6.669
Hong-Yu Ren,Ying-Qi Dai,Fanying Kong,Defeng Xing,Lei Zhao,Nan-Qi Ren,Jun Ma,Bing-Feng Liu
In this study, the growth and lipid accumulation of Scenedesmus sp. using different nanoparticles and light sources were investigated. Xenon lamp can produce a broad illumination spectrum, and exhibited better performance than light-emitting diode. SiC and g-C 3 N 4 nanoparticles improved the biomass and lipid accumulation, whereas TiO 2 and TiC nanoparticles had inhibitory influence on microalgae. Lipid production can be improved by oxidative stress produced by combination of nanoparticles and xenon lamp irradiation. At the optimal SiC nanoparticles concentration of 150 mg L −1 and photoperiod of 6:18 h, the maximum biomass concentration and total lipid content reached 3.18 g L −1 and 40.26%, respectively. The addition of SiC nanoparticles could promote the substrate utilization rate and induce stress condition, thereby enhancing the activity of acetyl-CoA carboxylase and lipid biosynthesis. This research shows that SiC nanoparticles addition combined with xenon lamp illumination is a promising strategy to promote microalgal growth and lipid accumulation.
研究领域:
生物技术
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环境科学
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产品关联
DOI
PubMed
高影响因子
INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
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2018
·
IF 4.229
Long-Fei Xie,Pei-Gao Duan,Jia-Li Jiao,Yu-Ping Xu
A series of Ni catalysts with different zeolites were prepared by wet impregnation method and used to catalyze supercritical water gasification (SCWG) of microalgae for production of hydrogen-rich fuel gas under conditions of 430 °C, 60 min, ρ H₂O = 0.162 g/cm 3 , 2 g/g Ni/zeolites. Compared with noncatalytic SCWG, the presence of Ni/zeolite could increase the hydrogen gasification efficiency and carbon gasification efficiency by promoting water–gas shift and steam reforming reactions which are mainly affected by the amount of strong acid sites and Ni, respectively. The highest carbon gasification efficiency (CGE) and hydrogen gasification efficiency (HGE) of 23.61% and 23.55% were achieved with Ni/HY (Na 2 O, 0.8%). The gaseous produced mainly consisted of H 2 and CO 2 . The H 2 content in the gaseous products varied from 27.15 to 40.51% depending on the Ni/zeolites and increased with increasing the SiO 2 /Al 2 O 3 molar ratio of HZSM-5, which is 2.3–3.6 times higher than that of produced without catalyst. The H 2 yield varied between 2.57 and 3.61 mmol/g depending on the Ni/zeolites and increased from 2.19 to 5.61 mmol/g with increasing the SiO 2 /Al 2 O 3 molar ratio from 50:1 to 170:1, which is 3.6–7.8 times higher than that of produced without catalyst. Coke formation, surface area loss, and sintering of Ni could decrease the activity of the Ni/zeolites.
研究领域:
能源生物学
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催化化学
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产品关联
DOI
高影响因子
SCIENCE OF THE TOTAL ENVIRONMENT
·
2023
·
IF 9.8
Chuxuan Zhang,Xun Gong,Jianhui Zeng,Zhengkang Peng,Xiaomin Li,Luqiu Lin,Yang Peng,Shuang Wang
Liquefaction of microalgae in ethanol offers an eco-friendly bio-oil alternative, but solvent recycling is crucial for sustainability due to extra costs. In this work, Chlorella vulgaris was liquefied in supercritical ethanol at 260 °C, and the solvent phase (SP) separated from bio-oil was recovered and reused. Five liquefaction cycles were performed at identical temperature and pressure conditions to investigate the effects on oil production and nitrogen transformation. The findings demonstrated a gradual increase in water content in recycled SP. Ethanol-water co-solvent as the reaction medium promoted the decomposition and re-polymerization of protein in raw material, thus increasing the bio-oil yield (76.84 %) and higher heating value (33.53 MJ/kg) to some extent. Simultaneously, the relative nitrogen content of bio-oil rose from 8.03 % to 8.52 %, predominantly in the form of nitrogen heterocycles. The potential pathway for nitrogen conversion was revealed, which establishes a theoretical basis for the subsequent denitrification of bio-oil.
研究领域:
生物能源
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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
·
2023
·
IF 7.7
Jingjing Fang,Junjie Qian,Wen Shi,Huaqian Mou,Xiujuan Chen,Gaoxiang Zhang,Zanfang Jin,Feili Li
The bioaccumulation of heavy metals (HMs) at the water-algal interface determines their threat degree to aquatic ecosystem . Amino acids (AAs), as predominant components of dissolved organic matter (DOM), play pivotal roles in shaping the speciation of HMs in water and their subsequent accumulation by algae. However, the diverse nature of amino acid poses a challenge in generalizing the underlying mechanisms. This study explores four amino acids (asparagine, aspartic acid , glycine, lysine), each possessing distinct amino and carboxyl groups , and investigates their impact on zinc (Zn) bioaccumulation through batch experiments. Upon the introduction of AAs, the adsorption process obeyed the pseudo-second-order kinetic adsorption model demonstrating chemisorption (R 2 >0.99), and it affected Zn externalization (up to 3.994 mmol g - 1 ). This phenomenon followed a two-step model, indicating multilayer adsorption. The study proposed that the protonated amino group of AA could serve as a link between Zn-AA complex and microalgae. Amino acids adsorbed onto the surface of microalgae via protonated amino groups did not occupy the Zn-binding sites, instead, they furnished additional functional groups. This differs from the previous results of organic acids containing only carboxyl functional groups as DOM. Multiple linear regression equations and correlation analyses were used to explain the effects of amino and carboxyl morphology on microalgae accumulation of Zn. The equation showed that the leading model terms explain 75.8% of the accumulation amount variance. This study enhances our understanding of the effects of functional group-different DOM on the accumulation of heavy metals in microalgae, offering insights for future research and prediction.
研究领域:
环境科学
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水生生态学
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产品关联
DOI
高影响因子
JOURNAL OF HAZARDOUS MATERIALS
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2021
·
IF 10.588
Quanfeng Wang,Haoxuan Wei,Wenbo Liu,Jun Zhai
Forty strains of Mn-oxidizing microalgae (MnOMs) with different Mn 2+ oxidation mechanisms were identified from two aquatic environments. Among them, three strains of isolates ( Chlamydomonas sp. WH1–1, Chlamydomonas sp. WH1–4 , and Chlorella sp. WH2–5) oxidize Mn 2+ by increasing the ambient pH and by secreting Mn oxidation factors (e.g., superoxide-production enzymes and/or other Mn oxidases) into the extracellular environment at the same time. In carbamazepine (CBZ) removal by MnOMs and/or Bio-MnOx, the combination of MnOMs and Bio-MnOx significantly increased the CBZ (1 mg/L) removal efficiency from 36.05% (by MnOMs alone) and 20.11% (by Bio-MnOx alone) to 80.13% by two synergistic mechanisms. One of the synergistic mechanisms was confirmed as that the Mn 2+ was re-oxidized by MnOMs to Bio-MnOx, which can promote the CBZ removal, and another was the mutual exchange of degradation products of CBZ as shared reactants between MnOMs and Bio-MnOx. The degradation intermediates of CBZ were analyzed using high-performance liquid chromatography-tandem mass spectrometry , based on which the CBZ degradation pathway by MnOMs and Bio-MnOx was proposed. These findings expand existing knowledge on the Mn 2+ oxidation mechanisms of MnOMs, and indicate that MnOMs and their generated Bio-MnOx are promising for the removal of CBZ or other pharmaceutical contaminants from wastewater.
研究领域:
环境科学
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微生物学
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制药工程
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分析化学
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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
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微生物学
✓ 已验证
DOI
PubMed
高影响因子
Algal Research-Biomass Biofuels and Bioproducts
·
2024
·
IF 4.6
Luqiu Lin,Jianhui Zeng,Chuxuan Zhang,Zhengkang Peng,Xun Gong
This study reports the transformation of three typical heavy metals (As(III), Hg(II), and Pb(II)) during the process for magnetic harvesting and subsequent liquefaction in ethanol of microalgae. The magnetic harvesting process of Chlorella Vulgaris (CV) was simulated using a co-precipitation method, achieving the highest magnetic harvesting ratio of 98.95 % at a pH of 8 and an iron-algae ratio of 0.4 g/g. Then the magnetically harvested CV was subjected to liquefaction in ethanol to explore the speciation and migration of As(III), Hg(II), and Pb(II). The environmental risk assessment of above three heavy metals in the bio-oil and biochar was assessed according to the Risk Assessment Code (RAC). Hg(II) and Pb(II) were found to be effectively stabilized and immobilized in the biochar, while As(III) exhibited a propensity to migrate into the bio-oil and existed mostly in the dangerous speciation such as fraction associated with Fe and Mn oxides and fraction bound to organic matter. It reflects a high environmental risk and necessitates a pre-removal treatment.
研究领域:
环境科学
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生物技术
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产品关联
DOI
高影响因子
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