Frontiers in Plant Science
·
2019
·
IF 4.106
Zhang Qiang,Liu Xiaofei,Zhang Zhifei,Liu Ningfang,Li Danzhu,Hu Longxing
Melatonin (MT), polyamines (PAs), and ethylene have been suggested to play key roles in plant growth and development in response to environmental abiotic stresses. However, the effect of melatonin on polyamine and ethylene metabolism under waterlogging stress has rarely been elucidated. The main purpose of this study was to investigate the effect of melatonin pretreatment on waterlogging stress in alfalfa. The experiment was arranged into four treatment groups control with water pretreatment (CK-MT), control with melatonin pretreatment (CK+MT), waterlogging pretreated with water (WL-MT) and waterlogging pretreated with melatonin (WL+MT), with three replications. Six-week-old alfalfa seedlings were pretreated with 100 μM melatonin and exposed to waterlogging stress for 10 days. Plant growth rate, different physiological characteristics, and gene expression level were measured. Results showed that waterlogging induced melatonin accumulation, and melatonin pretreatment increased endogenous MT levels for the control and water-logged plants. Waterlogging stress caused a significant reduction in plant growth, chlorophyll content, photochemical efficiency (Fv/Fm) and net photosynthetic rate (Pn), while also causing increased leaf electrolyte leakage (EL) and malondialdehyde (MDA) content. Pretreatment with melatonin alleviated the waterlogging-induced damage and reduction in plant growth, chlorophyll content, Fv/Fm and Pn. Waterlogging stress significantly increased leaf polyamines (Put, Spd, Spm) and ethylene levels, and the increased PAs and ethylene levels are coupled with higher metabolic enzymes and gene expressions. While pretreatment with melatonin further increased Put, Spd and Spm levels, it also decreased ethylene levels under waterlogging, and those increased PAs levels or decreased ethylene levels are regulated by the metabolic enzymes and gene expressions. The results in this study provide more comprehensive insight into the physiological and molecular mechanisms of melatonin-improved waterlogging tolerance in alfalfa. Furthermore, they suggested that melatonin improved waterlogging tolerance in alfalfa at least partially by reprogramming ethylene and PA biosynthesis, attributable to the increased PAs and decreased ethylene levels, which leads to more enhanced membrane stability and photosynthesis as well as less leaf senescence caused by ethylene.
研究领域:
植物生理学
·
分子生物学
✓ 已验证
DOI
PubMed
高影响因子
JOURNAL OF ANIMAL ECOLOGY
·
2024
·Vol. 94
·期 1
·112-124
·
IF 3.5
Gaoying Gu,Ziqi Wang,Tao Lin,Sainan Wang,Jianjun Li,Shihao Dong,James C. Nieh,Ken Tan
en This link goes to a English section zh This link goes to a Chinese section Predatory threats, even when they do not involve direct consumption (non-consumptive effects, NCEs), can profoundly influence the physiology and behaviour of prey. For example, honeybees that encounter hornet predators show responses similar to fear. However, the physiological mechanisms that are connected with this fear-like response and their effects on bee cognition and olfaction remain largely unknown. We show that bees decreased time spent near the hornet, demonstrated fearful behaviour and moved with greater velocity to escape. After a prolonged 24-h exposure, bees adopted defensive clustering, displayed greater predator avoidance, and experienced a decline in brain dopamine levels. Prolonged predator exposure also diminished bee olfactory sensitivity to odours and their mechanical sensitivity to air currents, contributing to impaired olfactory learning. However, boosting brain dopamine reversed one fear-like behaviour (average bee velocity in the presence of a hornet) and rescued olfactory sensitivity and learning. We therefore provide evidence linking dopamine to sensory and cognitive declines associated with fear in an insect. 摘要 en This link goes to a English section zh This link goes to a Chinese section 即便对猎物不构成直接捕杀(非消耗性捕食效应)，捕食者也可以对猎物的生理和行为造成严重的影响。例如，遭遇胡蜂捕食者时，蜜蜂会产生类似恐惧的反应。 然而，该类似恐惧反应相关的生理机制还没有详细研究，该类似恐惧反应对蜜蜂的认知嗅觉的影响也没有报道。 我们的实验结果表明，蜜蜂在遭遇胡蜂时表现出惧怕行为，表现为减少了在胡蜂附近的停留时间，并以更快的速度逃离。但在24小时的胡蜂胁迫后，蜜蜂表现出防御性集群行为，大脑多巴胺水平下降。长时间的捕食者暴露还降低了蜜蜂对气味的嗅觉敏感度以及气流的机械敏感性，导致嗅觉联想学习能力受损。 然而，人为提高蜜蜂大脑多巴胺水平缓解了它们对胡蜂的恐惧，并在一定程度上恢复了蜜蜂的嗅觉敏感度和学习能力。 因此，我们的研究表明多巴胺参与昆虫恐惧行为的调控，与嗅觉和认知下降密切相关。
研究领域:
昆虫学
·
神经生物学
·
行为生态学
✓ 已验证
DOI
高影响因子
RESEARCH ON CHEMICAL INTERMEDIATES
·
2024
·Vol. 50
·期 6
·2897-2915
·
IF 2.8
Liu Zengcheng,Wang Zhongchao,Wang Yanfei
The phosphinimide materials described in this paper were synthesized by polymerization precipitation. The properties of complexes coordinated with metal ions can be used as adsorbents for the adsorption of radioactive elements by using ligands such as imide and phosphorus groups. Then, the synthetic phosphinimide was characterized in detail by FT-IR, SEM, EDS and XPS, and its morphology and structural changes were studied. In addition, the effects of the material on the removal of uranium(VI) from aqueous solutions at different pH, sorbent doses, contact times, initial concentrations, and temperatures were studied. The experimental data shows that the adsorption process can fit the pseudo-second-order kinetic model well, which is in line with the Langmuir isotherm model. The thermodynamic study of adsorption shows that the adsorption process is a spontaneous endothermic process. In addition, at a temperature of 303.15 K and pH = 6, the maximum adsorption of uranium(VI) by phosphinimide in 25 min can reach 234.6 mg g −1 , and a removal rate of 97.75%.
研究领域:
化学
·
环境科学
✓ 已验证
DOI
高影响因子
Desalination and Water Treatment
·
2024
·
IF 1
Fei Chai,Runkai Wang,Pinhua Rao,Wenqi Zhang,Lili Yan,Niannian Yang,Yiyun Cai,Chunyan Xi
Aiming to increase the industrial application potential of kapok fibers (KF) derived from Ceiba pentandra to deal with the anionic dyes from water, a novel biosorbent with abundant ammonium groups was synthesized via layer-by-layer self-assembly of the surface polymerization of dopa-mine (DOPA) with cross-linked polyethyleneimine (PEI) and glutaraldehyde (GA). During the self- assembly process of the biosorbent (KF-DOPA-PEI/GA), the response surface methodology based on three-level three-factorial Box–Behnken design was applied to establish the optimum modification conditions. The morphological and surface characterization was carried out with scanning electron microscope, Fourier transform infrared spectroscopy and contact angle measurement demonstrating the successful assembly on the surface of kapok fibers. The batch tests investigated a high adsorption efficiency towards methyl orange (MO) with the maximum adsorption capacity of 85.02 mg/g and the biosorbent showed excellent reusability after five cycles with the hydrochloric acid solution, indicating a potential adsorbent for anionic dyes containing wastewater treatment.
研究领域:
环境科学
·
材料科学
·
化学工程
·
纳米技术
·
水处理
✓ 已验证
DOI
高影响因子
JOURNAL OF POLYMERS AND THE ENVIRONMENT
·
2024
·Vol. 32
·期 7
·3195-3207
·
IF 4.7
Xie Shuang,Yu Dawei,Yao Jiahong,Wei Zhimei,Wang Xiaojun,Yang Jie
Furan semi-aromatic polyamides have become a biobased substitute for existing petrochemical semi-aromatic polyamides and received more and more attention. In this study, a series of high-performance biobased furan polyamides with different diamine chain lengths (Poly(butylene furanamide) (PA4F), Poly(pentylene furanamide) (PA5F), Poly(hexamethylene furanamide) (PA6F), Poly(octamethylene furanamide) (PA8F) and Poly(dodecamethylene furanamide) (PA12F)) were successfully prepared; Except for PA4F, other resins could be synthesized by one step bulk polymerization. Meanwhile, the effect of diamine chain length was studied. Except for PA4F they were amorphous which was confirmed by IR, XRD and DSC analysis. PA12F to PA5F had high weight-average molecular weights ( M w ) ranging from 34,000 to 65,500 g/mol, number-average molecular weight ( M n ) ranging from 6100 to 26,300 g/mol, glass transition temperature ( T g ) ranging from 89 to 138 ℃ and temperature of decomposition at 5% mass loss ( T d-5% ) from 357 to 408 ℃. The T g of PA4F reached as high as 142 ℃. The tensile strength of PA12F, PA8F and PA5F was obtained for the first time, and reached up to 45, 62 and 84 MPa, respectively. The tensile strength of PA6F was also high at 74 MPa. The α relaxation temperatures of PA12F to PA5F were also high, up to 107, 136, 146 and 158 ℃, respectively.
研究领域:
高分子化学
·
材料科学
·
生物基材料
·
大分子化学
✓ 已验证
DOI
高影响因子
POLYMERS FOR ADVANCED TECHNOLOGIES
·
2011
·Vol. 22
·期 12
·2237-2243
·
IF 1.776
Chenhao Ke,Juan Li,Keyi Fang,Qiliang Zhu,Jin Zhu,Qing Yan
A hyperbranched polyamine was prepared using an A 2 + B 3 approach. It acted as a hyperbranched charring and foaming agent (HCFA) in combination with ammonium polyphosphate (APP) to form a new intumescent flame retardant (IFR) system for polyamide 6 (PA6). Effect of HCFA on flame retardant and thermal degradation properties of IFR-PA6 was investigated by limiting oxygen index (LOI), UL-94 vertical burning, cone calorimeter, and thermogravimetric analysis (TGA) tests. The IFR system presented the most effective flame retardancy in PA6 when the weight ratio of APP to HCFA was 2:1. The LOI value of IFR-PA6 could reach 36.5 with V-0 rating when the IFR loading was 30 wt%. Even if the loading decreased to 25 wt%, IFR-PA6 could still maintain V-0 rating with an LOI value of 31. TGA curves indicated that APP would interact with both PA6 and HCFA in PA6/APP/HCFA composite under heating. The interaction between APP and HCFA improved the char formation ability of IFR system and then much more char was formed for PA6/APP/HCFA composite than for PA6/APP. Therefore, better flame retardancy was achieved. Moreover, the structure and morphology of char residue were studied by Fourier transform infrared (FTIR), X-ray photoelectron spectroscopy (XPS), and scanning electron microscopy (SEM). The results indicated that compact and foaming char layer containing P-O-C structure was formed for PA6/APP/HCFA system during combustion. Copyright © 2010 John Wiley & Sons, Ltd.
研究领域:
高分子化学
·
材料科学
·
阻燃材料
·
热稳定性
·
聚合物复合材料
✓ 已验证
DOI
高影响因子
RSC Advances
·
2013
·Vol. 3
·期 41
·18803-18810
·
IF 2.562
Yue Liu,Jie Liu,Weiyuan Yao,Wanglai Cen,Haiqiang Wang,Xiaole Weng,Zhongbiao Wu
In this paper, an infrared study has been performed on CO2 adsorption over polyethylenimine (PEI) functionalized protonated titanate nanotubes (PTNTs) prepared by a simple wet impregnation method. It was found that PTNTs had a large amount of acidity sites, which had strong interaction with the amino groups of the loaded PEI. This interaction could lead to good dispersion of PEI molecules, resulting in good performance in adsorption capacity, amine efficiency and adsorption kinetics. Both weakly and strongly adsorbed CO2 species formed under CO2 exposure, which were attributed to hydrogen-bonded species and carbamate groups, respectively. The existence of strong surface acidity increased the proportion of weakly adsorbed CO2 on the protonated amine species, which was beneficial to the adsorption–desorption cyclic performance. Furthermore, it was confirmed that the interaction between the support surface and amine also resulted in the superior thermal stability of amine-modified sorbents. Overall, our results suggested that suitably tuning surface acidity of the support could effectively facilitate CO2 adsorption.
研究领域:
材料化学
·
环境科学
·
纳米材料
·
气体吸附
·
能源材料
·
催化化学
✓ 已验证
DOI
高影响因子
CHEMICAL ENGINEERING RESEARCH & DESIGN
·
2021
·
IF 3.739
Dan-Dan Shao,Long Wang,Xiang-Yu Yan,Xue-Li Cao,Ting Shi,Shi-Peng Sun
Nanofiltration membranes show great potential in water treatment and resource recovery for their special separation mechanisms that can separate the small molecules effectively. However, their wide application needs to address the low separation efficiency caused by the similar solute sizes and charges while using the charged NF membranes with nanopores. This work reports a low-cost amine–carbon quantum dots (CQDs–NH 2 ) modified thin-film composite (CTFC) membrane via the facile interfacial polymerization process. The electrostatic force and competing reaction between the positively charged CQDs–NH 2 and the reactive monomers reformulated the interfacial polymerization process. The resultant CTFC membrane exhibits improved surface morphology and hydrophilicity. Besides, the incorporation of CQDs–NH 2 changed the original polyamide network structures to construct more transport space. The CTFC membrane permeance was boosted significantly (from 6.2 to 38.44 L m −2 h −1 bar −1 ) compared with the unmodified TFC membrane, showing precise dyes separation property. This work may offer valuable guidance for the low-cost loose nanofiltration membrane preparation towards molecular separation.
研究领域:
材料科学
·
环境工程
·
水处理
·
膜技术
✓ 已验证
DOI
高影响因子
PROCESS SAFETY AND ENVIRONMENTAL PROTECTION
·
2022
·
IF 7.926
Jun Ma,Yuanyuan Wang,Hang Xu,Mingmei Ding,Li Gao
Per- and polyfluoroalkyl substances (PFAS) are a class of ‘forever chemicals’ that have become a global concern owing to their innate chemical stability on humans and water resources. The separation of PFAS from water resources via membrane technologies are facing huge challenge. High permeance and rejection membrane are required for PFAS. To achieve this goal, herein, we propose an MXene-reinforced interfacial polymerization of negatively charged polyamide (PA) membranes for high rejection of short-chain PFAS. The morphologies and chemical properties were systematically investigated for the fabricated membrane. Attributed to the hydrophilic of MXene , the permeance of MXene-PA membranes increased without sacrificing rejection. Density functional theory (DFT) calculations and various experiments elucidated in detail the underlying mechanism of the interactions between the membrane and PFAS. The enhanced electrostatic interaction and hydrogen bonding leaded to increased PFAS rejection and permeance. Therefore, the MXene-regulated PA membrane effectively solved the trade-off between the selectivity and permeability. This work shows that MXene-regulated interfacial polymerization techniques can be used to tailor the effectiveness of PA nanofiltration membranes to overcome the trade-off phenomenon and pave the way for solving the crisis of short-chain PFAS.
研究领域:
环境科学
·
材料科学
✓ 已验证
DOI
高影响因子
JOURNAL OF FOOD SCIENCE
·
2019
·Vol. 84
·期 5
·1138-1144
·
IF 2.081
Jingbo Zhang,Jing Hu,Shuai Wang,Xinping Lin,Huipeng Liang,Shengjie Li,Chenxu Yu,Xiuping Dong,Chaofan Ji
To effectively extract biogenic amines (BAs) from complex food matrices is an important issue. In this study, a stop-and-go-extraction tip (StageTip)-based method for simultaneous enrichment of six BAs including histamine, tyramine, putrescine, cadaverine, tryptamine, and β-phenylethylamine in fish samples was developed and optimized. This StageTip-based BAs extraction method required short extraction time, small sample size, and minimal consumption of organic solvents. In addition, an ultrahigh-performance liquid chromatography coupled with triple quadrupole mass spectrometer was used to identify and quantify BAs without derivatization. Target recovery efficiencies of BAs from spiked fish samples ranged from 84% to 110%. Linear regression models were established to determine BAs in the range of 0.4 to 3.0 mg/L ( R 2 > 0.995). Good repeatability was obtained with relative standard deviation of peak areas (1.17 to 5.61%) and retention time (0.09 to 0.20%). High sensitivity was achieved for the detection of six BAs (0.064 to 1.00 ng/L for the limit of detection, 0.10 to 5 ng/L for the limit of quantification). The proposed method had an obvious advantage in the analysis of BAs in complex food matrices such as fish tissues since it could reflect the subtle distribution of BAs from one fish fillet. Practical Application A StageTip-based BAs enrichment combined with UPLC-MS analysis method was developed and optimized, which was low - cost , environmentally friendly, and with good analytical performances. As such, it has the potential to become a powerful tool for the analysis of BAs in different complex food matrices.
研究领域:
食品科学
·
分析化学
✓ 已验证
DOI
高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2018
·
IF 6.735
Xueying Guo,Zhiwei Peng,Danlian Huang,Piao Xu,Guangming Zeng,Shuang Zhou,Xiaomin Gong,Min Cheng,Rui Deng,Huan Yi,Hao Luo,Xuelei Yan,Tao Li
Microorganism biotransformation of sulfamethazine (SMT) in aqueous environments is a major concern, especially considering their exposure to coexisting SMT and heavy metals. Phanerochaete chrysosporium ( P. chrysosporium ) is a more concerned Cadmium (Cd) and SMT hyper accumulation specie. This study, referring to metabolic mechanisms and application, was performed to investigate the single and combined effects of Cd-SMT, including toxicity, resistance, as well as the accumulation and biotransformation by P. chrysosporium . The results revealed that Cd-SMT co-contamination caused increasing active oxygen accumulation, and the number of antioxidant enzyme and non-enzymatic antioxidants were higher than that under the stress of their individual pollution. It was found that P. chrysosporium accumulated high levels of Cd with the increment of 6.98–23.96% induced by Cd-SMT co-contamination compared to under the stress of Cd individual pollution. What's more, the addition of Cd reduced the toxicity of SMT to P. chrysosporium . The decrease of malonaldehyde and the increase of protein also proved that P. chrysosporium held enormous potential to fit in the co-contaminated environment, and to remediate the co-contaminated water especially in the long-term treatment. These results undoubtedly contribute to the development of fungi-based technologies and the applications of P. chrysosporium in realistic environment rather than laboratory simulation environment.
研究领域:
环境科学
·
微生物学
✓ 已验证
DOI
高影响因子
ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH
·
2019
·Vol. 26
·期 27
·27712-27725
·
IF 2.914
Zhuan Run,Wang Jianlong
Antibiotics are becoming ubiquitous emerging contaminants in the aquatic environments due to their large amount of production and extensive application, which have received increasing public concern. In this paper, the degradation and mineralization of sulfamethoxazole (SMX) by ionizing radiation in the presence of Fe 3 O 4 as Fenton-like catalyst were evaluated, the influencing factors, such as the initial SMX concentration, initial pH, water matrix, and radical scavenger, etc. were examined. The results demonstrated that SMX could be efficiently degraded. The addition of Fe 3 O 4 could improve the degradation efficiency of SMX and increased the dose constant at various SMX initial concentrations. More than 98% of SMX was degraded in Fe 3 O 4 /gamma radiation system at a wide range of pH (about 3.0–11.0). The mineralization of SMX in the presence of Fe 3 O 4 was increased by 200%. Adding free radical scavenger (tert-butyl alcohol) inhibited the degradation of SMX. The addition of Fe 3 O 4 enhanced the dose constant of ·OH, indicating that Fe 3 O 4 promoted the formation of hydroxyl radicals (·OH) and then improved SMX degradation and mineralization. The degradation efficiency of SMX in secondary effluent of WWTP decreased from 100 to 84% in secondary effluent compared with that in deionized water. The intermediate products during the degradation of SMX by ionizing radiation were identified by high-performance liquid chromatography, and a possible pathway of SMX degradation in such a system was tentatively proposed.
Schema illustration of SMX degradation by irradiation in the presence of Fe 3 O 4
研究领域:
环境科学
·
放射化学
✓ 已验证
DOI
高影响因子
危险品化学品经营许可证（带存储）