CANADIAN ENTOMOLOGIST
·
2025
·
IF 1.1
Lina Guo,Yu Zhang,Jue Wang,Diandian Yu,Min Wu,Yuan Guo
Temperature is the most significant abiotic factor that affects the growth and behaviour of insects. However, the mechanism by which the olfactory system senses thermal stimulus and combines temperature and chemical signals to trigger certain behavioural outputs is unclear. This study aimed to clarify the mechanism by which environmental temperature affects olfactory perception in Apis cerana cerana (Hymenoptera: Apidae). We used quantitative reverse-transcriptase polymerase chain reaction and western blotting to analyse the expression of AcerOr1 and AcerOr2. We also used electroantennography (EAG) assays to detect bee antennal responses to odorants at different temperatures. The results revealed that the mRNA expression of AcerOr1 and AcerOr2 was significantly influenced by temperature. These genes exhibited both increases and decreases in expression over time, with the most significant differential observed at 25 °C. Protein expression was similarly affected at 2 hours after different temperature treatments. Electroantennography responses from the antennae revealed that six odorant volatiles – N-(4-ethylphenyl)-2-((4-ethyl-5-(3-pyridinyl)-4H-1,2,4-triazol-3-yl)thio)acetamide (VUAA1), linolenic acid, eugenol, hexyl acetate, 1-nonanol, and lauroleic acid – had the most dramatic effect at 25 °C. The results indicate that environmental factors affecting the expression of AcerOr1 and AcerOr2 modulate olfactory recognition behaviour in A. cerana cerana, suggesting that changes in environmental temperature can affect bees’ olfactory preferences.
研究领域:
昆虫学
·
分子生物学
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DOI
高影响因子
CANADIAN ENTOMOLOGIST
·
2025
·
IF 1.1
Chunfu Zhang,Kaifei Guo,Song Yang,Zhen Chen
In this study, changes in physiological characteristics of Coridius chinensis (Hemiptera: Dinidoridae) during diapause and post-diapause development period were determined. The moisture content of C. chinensis at the beginning of diapause was significantly lower than that at any other stage, and the moisture content during post-diapause development period was significantly higher than that from October to December 2021 and in February and April of the following year. The fat content gradually declined over time. The glycogen content remained at lower levels during diapause but rose sharply during the post-diapause development period, when it became significantly higher than that during diapause. The trehalose content gradually declined in the early stages of diapause but rose greatly in the middle stage, followed by a gradual decline in the late stages and a significant increase during the post-diapause development period. The protein content was at lower levels in the early stages of diapause, significantly lower than that in the middle and late stages of diapause and that during post-diapause development period. The results indicated significant differences in changes in the moisture, fat, carbohydrate, and protein contents between the diapause and post-diapause development periods, with obvious stage characteristics. This study provides a scientific basis for further research on the diapause physiology of C. chinensis.
研究领域:
昆虫生理学
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滞育生物学
·
代谢生理学
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昆虫生物化学
·
发育生物学
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产品关联
DOI
高影响因子
SCIENCE OF THE TOTAL ENVIRONMENT
·
2018
·
IF 4.61
Bo Liu,Hao Zhang,Qi Lu,Guanghe Li,Fang Zhang
To address the challenges of low hydrodechlorination efficiency by non-noble metals, a Cu Ni bimetallic cathode with nanostructured copper array film was fabricated for effective electrochemical dechlorination of trichloroethylene (TCE) in aqueous solution. The Cu Ni bimetallic cathodes were prepared by a simple one-step electrodeposition of copper onto the Ni foam substrate, with various electrodeposition time of 5/10/15/20 min. The optimum electrodeposition time was 10 min when copper was coated as a uniform nanosheet array on the nickel foam substrate surface. This cathode exhibited the highest TCE removal, which was twice higher compared to that of the nickel foam cathode. At the same passed charge of 1080C, TCE removal increased from 33.9 ± 3.3% to 99.7 ± 0.1% with the increasing operation current from 5 to 20 mA cm −2 , while the normalized energy consumption decreased from 15.1 ± 1.0 to 2.6 ± 0.01 kWh log −1 m −3 . The decreased normalized energy consumption at a higher current density was due to the much higher removal efficiency at a higher current. These results suggest that Cu Ni cathodes prepared by simple electrodeposition method represent a promising and cost-effective approach for enhanced electrochemical dechlorination.
研究领域:
环境科学
·
材料科学
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DOI
PubMed
高影响因子
JOURNAL OF HAZARDOUS MATERIALS
·
2025
·
IF 11.3
Yuxiang Shi,Ruofan Li,Wei-xian Zhang
Sulfur doping into the crystalline lattice of zero-valent iron (ZVI) enhances its electronic properties and local structure, improving its efficacy for transforming environmental contaminants. This study demonstrates a novel high-energy ball milling approach to initiate mechanochemical reactions for precise sulfur doping into the Fe 0 lattice, addressing the hazards posed by hexavalent chromium (Cr(VI)) and trichloroethylene (TCE), two priority pollutants known to threaten public health and ecosystems. Mechanochemically sulfidized ZVI (SZVI, 0.182 %–5.698 % sulfur) exhibited Cr(VI) and TCE removal rates up to 20 and 7 times higher, respectively, than SZVI prepared by conventional solution chemistry with aqueous Na 2 S, forming primarily surface-bound iron sulfides. By tuning milling time to control sulfur incorporation, removal capacities of 130.5 mg/g for Cr(VI) (S: 3.802 %) and 70.1 mg/g for TCE (S: 4.557 %) were achieved under environmentally relevant conditions mimicking groundwater matrices. Mechanical energy catalyzes in-situ iron sulfide (FeS x ) ieformation through lattice expansion and atomic-scale Fe-S interpenetration, as confirmed by FeS and FeS 2 crystalline phases, symmetric Fe-S bond vibrations, and rearrangement in the Fe coordination environment. These findings advance ZVI-based remediation strategies, mitigating risks from hazardous contaminants in environmental systems.
研究领域:
环境科学
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材料科学
·
化学工程
·
机械化学
·
水处理技术
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产品关联
DOI
PubMed
高影响因子
JOURNAL OF HAZARDOUS MATERIALS
·
2025
·
IF 11.3
Xin Liu,Qing Wang,Zhuanxia Zhang,Liangchun Jia,Zhenxing Shen,Tengwen Long,George Zheng Chen,Jun He,Xin Song
The co-mingled plumes of chloroethenes and per- and polyfluoroalkyl substances (PFASs) raise a major challenge for groundwater remediation. This study is the first try to apply sulfidated nano zero-valent iron supported on calcined layered double oxides (S-nZVI@LDO) for simultaneous removal of trichloroethylene (TCE) and perfluorooctanoic acid (PFOA). Our findings revealed that 2 g/L S-nZVI@LDO simultaneously removed 73.3 % TCE and 37.8 % PFOA in pure water, with 49.5 % TCE degraded to less chlorinated products and 23.8 % adsorbed or unquantified transformation of C 3 –C 6 hydrocarbons. Comparative experiments using individual and co-occurring TCE and PFOA revealed that co-existing PFOA and TCE minimally affected their respective removal efficiencies, highlighting S-nZVI@LDO’s suitability for co-contaminant remediation. Furthermore, S-nZVI@LDO achieved optimal TCE and PFOA removal under acidic conditions, surpassing non-composite S-nZVI and LDO. Based on the characterization of S-nZVI@LDO, TCE removal involved reductive dechlorination and sorption via hydrophobic interactions, while PFOA removal was primarily driven by electrostatic interactions and hydrogen bonding. In real groundwater, S-nZVI@LDO achieved 58.2 % TCE and 33.7 % PFOA removal. Additionally, S-nZVI@LDO simultaneously removed nine different PFASs from a 12-PFASs mixture and demonstrated greater effectiveness for long-chain PFASs and their alternatives (e.g., GenX) owing to their hydrophobic nature. These findings highlight the potential of S-nZVI@LDO as an effective material for TCE-PFOA co-contaminated groundwater.
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产品关联
DOI
PubMed
高影响因子
WATER RESEARCH
·
2022
·
IF 13.4
Shuangjie Xiao,Zilan Jin,Haoran Dong,Junyang Xiao,Yangju Li,Long Li,Rui Li,Jie Chen,Ran Tian,Qianqian Xie
There are plentiful ways to synthesize sulfidized nanoscale zerovalent iron (S-nZVI), and this study investigated the influence of sulfur reagents (Na 2 S, Na 2 S 2 O 3 , Na 2 S 2 O 4 ) and sulfidation sequence (co-sulfidation and post-sulfidation method) on the physicochemical properties, reactivity, and long-term performance of S-nZVI in simulated groundwater. The results suggested that the co-sulfidized nZVI (S-nZVI co ) has higher reactivity (∼2-fold) than S-nZVI post due to the stronger electron transfer capacity, deriving from the higher content of Fe 0 and reductive sulfur species. However, during aging, the reactivity of S-nZVI co would be lost more rapidly than S-nZVI post , due to the faster corrosion of Fe 0 and more oxidation of reductive sulfur species. S-nZVI post has the superior long-term performance with the degradation rate of trichloroethylene (TCE) remained at 30%∼60% even after 90 d of aging. Sulfur precursors can control the selectivity of S-nZVI by affecting the sulfur speciation on the particle surface. The proportion of reductive sulfur species on S-nZVI post synthesized by Na 2 S was higher than S-nZVI post synthesized by Na 2 S 2 O 3 or Na 2 S 2 O 4 , resulting in a higher selectivity of the former S-nZVI post than the latter S-nZVI post . In addition, sulfidation procedures and sulfur precursors did not affect the degradation pathway of TCE. Nevertheless, the degradation product distribution can be affected by the different physicochemical transformation of various types of S-nZVI with the aging time. These results indicated that sulfur reagents and sulfidation procedures have crucial effects on the reactivity and long-term performance of S-nZVI, which can be designed for the specific application scenarios.
研究领域:
环境科学
·
化学工程
·
材料科学
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产品关联
DOI
PubMed
高影响因子
Molecular & Cellular Toxicology
·
2017
·Vol. 13
·期 1
·59-64
·
IF 1.25
Chen Jiahong,Zhang Hang,Aniagu Stanley,Jiang Yan,Chen Tao
Trichloroethylene (TCE) had been shown to induce aberrant DNA methylation changes in mouse liver, which could be critical in the development of hepatocellular carcinoma. To understand the effect of methionine, a methyl donor, on TCE-induced mouse liver cancer, we exposed B6C3F1 mice to TCE in the presence or absence of methionine. We found that supplementation with methionine attenuated the TCE-induced hypo- and hyper-methylation status of Cdkn1a and Ihh in mouse liver, respectively. The TCE-induced mRNA expression changes of Cdkn1a, Ihh and Jun were also alleviated by methionine. However, methionine supplementation accelerated the TCE-induced mRNA over-expression of Mki67, and enhanced the TCE-induced mRNA down-regulation of Dnmt3a and Tet2. In summary, our results showed that methionine could attenuate at least part of the TCE-induced DNA methylation changes, but the additional gene expression changes induced by supplementary of methionine does not support the assumption that methionine could prevent TCE-induced liver carcinogenesis.
研究领域:
毒理学
·
分子生物学
·
癌症研究
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产品关联
DOI
高影响因子
ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH
·
2017
·Vol. 24
·期 21
·17598-17605
·
IF 2.741
Wang Na,Jia Daqing,Jin Yaoyao,Sun Sheng-Peng,Ke Qiang
The present study investigated the degradation of trichloroethylene (TCE) in sand suspensions by Fenton-like reaction with magnetite (Fe 3 O 4 ) in the presence of various chelators at circumneutral pH. The results showed that ethylenediaminetetraacetic acid (EDTA) and nitrilotriacetic acid (NTA) greatly improved the rate of TCE degradation, while [S,S]-ethylenediaminedisuccinic acid (s,s-EDDS), malonate, citrate, and phytic acid (IP6) have minimal effects on TCE degradation. Quenching tests suggested that TCE was mainly degraded by hydroxyl radical (HO · ) attack, with about 90% inhibition on TCE degradation by the addition of HO · scavenger 2-propanol. The presence of 0.1–0.5% Fe 3 O 4 /sand ( w / w ) contributed to 40% increase in TCE degradation rates. In particular, the use of chelators can avoid high concentrations of H 2 O 2 required for the Fenton-like reaction with Fe 3 O 4 , and moreover improve the stoichiometric efficiencies of TCE degradation to H 2 O 2 consumption. The suitable concentrations of chelators (EDTA and NTA) and H 2 O 2 were suggested to be 0.5 and 20 mM, respectively. Under the given conditions, degradation rate constants of TCE were obtained at 0.360 h −1 with EDTA and 0.526 h −1 with NTA, respectively. Enhanced degradation of TCE and decreased usage of H 2 O 2 in this investigation suggested that Fenton-like reaction of Fe 3 O 4 together with NTA (or EDTA) may be a promising process for remediation of TCE-contaminated groundwater.
研究领域:
环境科学
·
化学工程
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产品关联
DOI
PubMed
高影响因子
International Journal of Environmental Research and Public Health
·
2022
·Vol. 19
·期 10
·6299
·
IF 4.614
Yue Lang,Yanan Yu,Hongtao Zou,Jiexu Ye,Shihan Zhang
Trichloroethylene (TCE) is one of the most widely distributed pollutants in groundwater and poses serious risks to the environment and human health. In this study, sulfidated nanoscale zero-valent iron (S-nZVI) materials with different Fe/S molar ratios were synthesized by one-step methods. These materials degraded TCE in groundwater and followed a pathway that did not involve the production of toxic byproducts such as dichloroethenes (DCEs) and vinyl chloride (VC). The effects of sulfur content on TCE dechlorination by S-nZVI were thoroughly investigated in terms of TCE-removal efficiency, H2evolution, and reaction rate. X-ray diffraction (XRD) and X-ray Photoelectron Spectroscopy (XPS) characterizations confirmed Fe(0) levels in S-nZVI were larger than for zero-valent iron (nZVI). An Fe/S molar ratio of 10 provided the highest TCE-removal efficiencies. Compared with nZVI, the 24-h TCE removal efficiencies of S-nZVI (Fe/S = 10) increased from 30.2% to 92.6%, and the Fe(0) consumed during a side-reaction of H2evolution dropped from 77.0% to 12.8%. This indicated the incorporation of sulfur effectively inhibited H2evolution and allowed more Fe(0) to react with TCE. Moreover, the pseudo-first-order kinetic rate constants of S-nZVI materials increased by up to 485% compared to nZVI. In addition, a TCE degradation was proposed based on the variation of detected degradation products. Noting that acetylene, ethylene, and ethane were detected rather than DCEs and VC confirmed that TCE degradation followed β-elimination with acetylene as the intermediate. These results demonstrated that sulfide modification significantly enhanced nZVI performance for TCE degradation, minimized toxic-byproduct formation, and mitigated health risks. This work provides some insight into the remediation of chlorinated-organic-compound-contaminated groundwater and protection from secondary pollution during remediation by adjusting the degradation pathway.Keywords:S-nZVI;sulfidation;trichloroethylene;pathway;groundwater safety
研究领域:
环境科学
·
化学
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产品关联
DOI
PubMed
高影响因子
JOURNAL OF ENVIRONMENTAL MANAGEMENT
·
2019
·
IF 4.865
Yuyan Liu,Saran P. Sohi,Siyuan Liu,Junjie Guan,Jingyao Zhou,Jiawei Chen
To address inorganic and organic contaminants in the environment, economic new adsorbents are required. Here we test magnetic biochar for efficient capture of the typical pollutants Cr(VI) and trichloroethylene (TCE) from solution. We used a simple synthesis using 2M FeCl 3 solution and peanut hull biomass to prepare magnetic ZVI biochar at alternate pyrolysis temperatures between 650 and 800 °C. The physicochemical character of the biochars were assessed using X-ray diffraction (XRD) and the Brunauer-Emmett-Teller (BET) method for surface area. The magnetic ZVI biochars were highly effective in the removal of Cr(VI) and TCE. The most effective magnetic biochar produced at 800 °C was further examined using scanning electron microscopy (SEM), revealing a high and even loading of ZVI. After sorption the same magnetic biochar was examined by X-ray photoelectron spectroscopy (XPS) to ascertain the underlying mechanisms. The dependence of Cr(VI) capture on solution pH was also examined. Our interpretation suggests that when pH < pH zpc (2.5) electrostatic attraction and redox reactions dominated the adsorption of Cr(VI). When pH > pH zpc the removal process was controlled mainly by redox reaction and substitution of chromate anions for hydroxyl ( OH) groups. Capture of TCE in contrast involved hydrophobic partitioning, pore-filling and reductive degradation. Overall our results suggest that simple synthesis of magnetic ZVI biochar could offer an economic and effective option to address water contamination issues.
研究领域:
环境科学
·
材料科学
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产品关联
DOI
PubMed
高影响因子
ENVIRONMENTAL SCIENCE & TECHNOLOGY
·
2021
·
IF 9.028
Li Gong,Xiaojiang Qiu,Dong Cheng,Yao Hu,Zaizhi Zhang,Qunsen Yuan,Dezhi Yang,Chengshuai Liu,Liyuan Liang,Feng He
Sulfidated zero-valent iron (S-ZVI) enhances the degradation of chlorinated hydrocarbon (CHC) in contaminated groundwater. Despite numerous studies of S-ZVI, a versatile strategy to improve its dechlorination kinetics, electron efficiency (εe), and dechlorination capacity is still needed. Here, we used heteroatom incorporation of N(C) and S by ball-milling of microscale ZVI with melamine and sulfur via nitridation and sulfidation to synthesize S-N(C)-mZVIbm particles that contain reactive Fe-NX(C) and FeS species. Sulfidation and nitridation synergistically increased the trichloroethene (TCE) dechlorination rate, with reaction constants kSA of 2.98 × 10–2 L·h–1·m–2 by S-N(C)-mZVIbm, compared to 1.77 × 10–3 and 8.15 × 10–5 L·h–1·m–2 by S-mZVIbm and N(C)-mZVIbm, respectively. Data show that sulfidation suppressed the reductive dissociation of N(C) from S-N(C)-mZVIbm, which stabilized the reactive Fe-NX(C) and reserved electrons for TCE dechlorination. In addition to lowering H2 production, S-N(C)-mZVIbm dechlorinated TCE to less reduced products (e.g., acetylene), contributing to the material’s higher εe and dechlorination capacity. This synergistic effect on TCE degradation can be extended to other recalcitrant CHCs (e.g., chloroform) in both deionized and groundwater. This multiheteroatom incorporation approach to optimize ZVI for groundwater remediation provides a basis for further advances in reactive material synthesis.
研究领域:
环境科学
·
材料科学
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DOI
PubMed
高影响因子
CHEMOSPHERE
·
2019
·
IF 5.108
Xinmin Yang,Chong Zhang,Fei Liu,Jie Tang,Fuyang Huang,Li Zhang
There have been many studies on TCE degradation by synthesized nanoscale zero-valent iron (nZVI B ) and commercial nanoscale zero-valent iron (nZVI H ), but the effect of anaerobic corrosion on the dechlorination pathways and speciation distribution of chlorine is still unclear. Compared with nZVI H , nZVI B has a faster degradation rate of TCE and formation rate of Cl − (aq) ( k SA, TCE = 3.67 ± 0.85 × 10 −4 & 2.17 ± 0.13 × 10 −4 L·h −1 ·m −2 and k obs, Cl − = 0.344 ± 0.027 & 0.166 ± 0.010 μM·h −1 for nZVI B & nZVI H , respectively). Based on the characterization of XRD , XPS and TEM during the anaerobic corrosion, the corrosion of nZVI B was dramatic under the dissolution-reprecipitation mechanism; but that of nZVI H was moderate and inward by maintaining the core-shell structure and shaping slightly rough and lumpy surface. Due to the different corrosion products (FeOOH for nZVI B and Fe 3 O 4 /γ-Fe 2 O 3 for nZVI H ) and the catalysis of boron on the nZVI B surface, the preferential dechlorination pathway of TCE was not identical by hydrogenolysis (nZVI B ) vs. reductive β-elimination (nZVI H ). Meanwhile, the dechlorination pathway of nZVI H was similar to that of ZVI and the reductive pathway to acetylene bypassed the formation of more toxic VC. This study shows that the high reactivity of nZVI B results in rapid corrosion with the side effect of enhanced adsorption of VC while nZVI H has a stable core-shell structure and less sorbed chlorine, which provides a new sight to access the ecological risk of nZVI due to the overlooked effect of non-identical corrosion.
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DOI
高影响因子
危险品化学品经营许可证（带存储）