ELECTROCHIMICA ACTA
·
2022
·
IF 7.336
Bo Jiang,Taoying Kong,Zehua Cai,Weichen Zhu,Rengui Xiao
Low conductivity severely limits the application of polymer materials in dual-ion batteries (DIBs), which results in high voltage drop and capacity degradation. In this paper, a strategy of in-situ modification is proposed, which utilize the adsorption of Na + by polyimide (PI) anode to destroy the symmetric conjugation effect, thus the cycle performance is greatly improved. In this dual-ion battery (PI/NaCl-DIB), polyimide material mixed with trace amounts of NaCI (PI/NaCl), natural graphite (NG) and 1-ethyl-3-methylimidazolium bis(trimethylmethane sulfonyl)imide salt (EMImTFSI) pure ionic liquid are used as anode, cathode and electrolyte, respectively. Due to the addition of NaCI in electrochemical process, the storage mechanism of cations on polyimide anode is changed, and capacity performance is also improved. PI/NaCl-DIB has a maximum capacity of 79 mAh g − 1 at 1 C and still discharges 45 mAh g − 1 at a large rate of 5 C after 300 cycles, with a capacity retention of 96%, while the battery with pure polyimide (PI-DIB) only has 25.0 mAh g − 1 at 1 C. The mechanism of NaCI in the polyimide anode materials is investigated by SEM, XRD, XPS, and CV, and the in-situ modification model is constructed for PI/NaCI anode in DIB.
研究领域:
材料科学
·
电化学
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Communications Materials
·
2025
·Vol. 6
·期 1
·233
·
IF 9.6
Wang Ruoming,Yang Guangping,Yang Tianxiang,Lu Yuzheng,Raza Rizwan,Zhu Bin,Lund Peter D.,Yun Sining
High ionic conductivity at reduced temperatures may allow electrochemical cell applications to be efficiently scaled up. Herein, we introduce an approach that exploits electrode-electrode synergy and in situ structural transformation to increase the ionic conductivity of an electrolyte within the electrochemical cell. This transformation is based on the formation of a Li 2 TiO 3 -Li 2 CO 3 heterostructure electrolyte via the combination of a TiO 2 semiconductor precursor, polystyrene spheres as the soft skeleton, and the lithium-based electrode LiNi 0.8 Co 0.15 Al 0.05 O 2 . The unique surface and interface of the heterostructure electrolyte enable the formation of long-range ion transport channels that lower electrode impedance, resulting in a superior ionic conductivity of 0.23 S cm −1 at 550 °C and a high-power density of 1239 mW cm −2 . Our general method to form superionic electrolytes shows potential in fuel cell technologies.
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COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
·
2023
·
IF 5.2
Jiayu Zhao,Yutie Gong,Hairong Li,Aihua Xu,Zhenzhen Li,Jing Huang,Hao Xu,Leping Huang,Ming Jiang
Thermally-triggered electrical switching materials are of urgent demand for developing novel temperature sensors , overheat protection circuits, thermal controllers, battery management systems against overheating, etc. Here, we report a water-in-oil emulsion system with giant electrical switching ratios at room temperature prepared by a simple and efficient method. The temperature-sensitive phase transition process of alkanes as the oil phase causes the formation and collapse of conductive paths in the emulsion, resulting in electrical switching ratios of up to 6 orders of magnitude. The emulsions have good thermal cycle stability, and the switching ratio remains essentially unchanged after 100 cycles. The switching temperature can be easily adjusted by using alkanes of various chain lengths. In addition, the similar electrical switching effect is observed in four emulsions containing different neutral salts, ensuring the tunability and versatility of the system. The electrical switching emulsions offer a promising avenue to developing future high-performance, energy-saving, and low-cost electrical switching systems.
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PEST MANAGEMENT SCIENCE
·
2022
·Vol. 79
·期 2
·833-844
·
IF 4.462
Kaixin Li,Jiantao Liu,Ziqiong Geng,Wei Xu,Zhuang Zhang,Dong Chu,Lei Guo
BACKGROUND Bemisia tabaci (Gennadius) is a serious agricultural pest worldwide. Neonicotinoids are the most important new class of synthetic insecticides used in the management of B. tabaci . However, B. tabaci populations have developed resistance to various active ingredients in neonicotinoids following long-term and widespread application. RESULTS Dinotefuran exhibited high toxicity against most B. tabaci field populations. One population (Din-R) with a high level of resistance to dinotefuran (255.6-fold) was first identified in the field. The Din-R population exhibited medium to high levels of resistance to all the tested neonicotinoid insecticides and a high level of resistance to spinetoram. Genetic inheritance analysis revealed that resistance to dinotefuran was incompletely recessive and polygenic. The synergist piperonyl butoxide significantly increased the toxicity of dinotefuran to Din-R. P450 activity in the Din-R population was 2.19-fold higher than in the susceptible population. RNA-sequencing analysis showed that 12 P450 genes were significantly upregulated in the Din-R population, of which CYP6DW5 , CYP6JM1 and CYP306A1 were found to exhibit more than 3.00-fold higher expression in Din-R when using a reverse transcription quantitative real-time polymerase chain reaction. Expression of eight P450 genes was obviously induced by dinotefuran, and CYP6DW5 showed the highest expression level. After knockdown of CYP6DW5 in Din-R, the toxicity of dinotefuran increased significantly. CONCLUSION P450 had a crucial role in dinotefuran resistance in B. tabaci , and CYP6DW5 was involved in the resistance. These results provide important information for the management of resistance in B. tabaci and improve our understanding of the resistance mechanism of dinotefuran. © 2022 Society of Chemical Industry.
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PubMed
高影响因子
Food Quality and Safety
·
2022
·
IF 3.949
Shen Changxin,Liu Lian,Yin Xiaoyao,Tu Fengqin,Wu Kejia,Wu Qian,Peng Lingfeng,Fang Min,Wu Yongning,Gong Zhiyong
Perchlorate concentrations in 387 unhusked rice samples from 15 main producing provinces/municipality in China were investigated by high-performance liquid chromatography–tanden mass spectrometry. The results indicated that perchlorate displays a mean level of 17.17 μg/kg in unhusked rice samples. Intriguingly, we also found that perchlorate is mainly observed in rice husk among these collected unhusked rice samples, while less observed in rice bran and milled rice. Specifically, the perchlorate levels in rice were found in the husks (73.61%), bran (10.09%), and milled rice (19.52%), respectively. Our results indicated that there is no significantly perchlorate exposure risk in edible milled rice.
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CHINESE JOURNAL OF PHYSIOLOGY
·
2023
·Vol. 66
·期 6
·516
·
IF 1.8
Zhang Zhongyuan,Wang Wei
Acute lung injury (ALI) is classified as a devastating pulmonary disorder contributing to significant incidence and fatality rate. Irbesartan (IRB) is an angiotensin II receptor blocker that has been proposed to protect against oleic acid-induced ALI. To this end, the current study is concentrated on ascertaining the role of IRB in ALI and figuring out the probable action mechanism. First, cell counting kit-8 (CCK-8) appraised the viability of human pulmonary microvascular endothelial cells (HPMVECs) exposed to ascending concentrations of IRB. HPMVEC injury model and a mouse model of ALI induced by lipopolysaccharide (LPS) were pretreated by IRB. In vitro , cell viability was estimated by CCK-8 assay, and lactate dehydrogenase (LDH) release was tested by LDH assay kit. Enzyme-linked immunosorbent assay (ELISA) and Western blotting estimated the expression levels of inflammatory factors. Fluorescein isothiocyanate–dextran was used to assess HPMVEC permeability. Western blotting examined the expression of adherent and tight junction proteins. In vivo , hematoxylin and eosin staining evaluated lung tissue damage and lung wet/dry (W/D) weight was measured. ELISA analyzed the levels of inflammatory factors in the serum and bronchoalveolar lavage fluid (BALF), and Western blotting examined the expression of inflammatory factors. The total cell, neutrophil, and macrophage numbers in BALF were determined using a cell counter. Lung capillary permeability was assayed by Evans blue albumin and total protein concentration in BALF was measured using bicinchoninic acid method. Immunofluorescence assay and Western blotting examined the expression of adherent and tight junction proteins in lung tissues. It was observed that IRB dose-dependently enhanced the viability while reduced LDH release, inflammatory response as well as permeability in LPS-challenged HPMVECs in vitro . In addition, LPS-stimulated lung tissue damage, pulmonary edema, inflammatory response as well as lung capillary permeability in vivo were all reversed following IRB treatment. Collectively, IRB treatment might elicit protective behaviors against LPS-triggered ALI.
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ENVIRONMENTAL POLLUTION
·
2021
·
IF 8.071
Jianfeng Tang,Jing Sun,Wendong Wang,Lei Yang,Yaoyang Xu
Pharmaceuticals are of increasing environmental concern due to their potential threat to aquatic ecosystems . Intensive human activities are a major factor influencing the level of pharmaceutical pollution in aquatic ecosystems. In this study, we investigated the occurrence, ecological risks of 31 pharmaceuticals and the possible influence of human activities on pharmaceutical distribution in two watersheds in the Yangtze River Delta, Eastern China. The target compounds were grouped into six categories: three non-steroidal anti-inflammatory drugs, ten antibiotics, six cardiovascular drugs, five hormones, six psychotropic drugs , and one antiparasitic. All target pharmaceuticals were detected in the surface water samples, with dexamethasone (100% of samples), tetracycline (100% of samples), and cefradine (100% of samples) being the dominant compounds (maximum concentrations of 686, 128, and 2280 ng/L, respectively). The total pharmaceutical concentrations were significantly higher in the urban watershed (711–2790 ng/L, mean = 1150 ng/L) than in the peri-urban watershed (467–1525 ng/L, mean = 863 ng/L) (p < 0.05). Distinct variation in the total pharmaceutical concentration also occurred between the dry season (507–2790 ng/L, mean = 1100 ng/L) and the wet season (467–1525 ng/L, mean = 943 ng/L). Ecological risk assessment showed that in the two watersheds, benzylpenicillin potassium, tetracycline hydrochloride, chlormadinone, ampicillin, cefotaxime acid, atorvastatin, sertraline hydrochloride, and oxazepam posed a medium potential risk (0.1 < risk quotient < 1), while norethisterone posed a high potential risk (risk quotient > 1). Redundancy analysis revealed that the concentrations of pharmaceuticals in various categories were positively correlated with land-use type (urban and agricultural land-use percentages), population density, and distance from town in both watersheds. Urban and agricultural activities were likely the main factors influencing the concentrations and composition of pharmaceuticals in these aquatic environments. Positive correlations were also found between total pharmaceutical concentrations and population density in both watersheds, suggesting a significant contribution of human disturbance to pharmaceutical pollution. The results provide useful information for pharmaceutical pollution control , ecological risk assessment, and sustainable water management at the watershed scale.
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JOURNAL OF FOOD PROTECTION
·
2020
·
IF 1.581
Mengmeng Jiang,Haicheng Gao,Xinxin Liu,Yu Wang,Jiaqi Lan,Yuanxiang Li,Shaowu Lv,Ketong Zhu,Pingsheng Gong
ABSTRACT We evaluated fresh vegetables for residues of 18 pesticides with different chemical structures, including organochlorine pesticides, organophosphorus pesticides, carbamate pesticides, and pyrethroid pesticides and estimated that the potential health risks for consumers. A total of 313 samples were collected from 12 kinds of vegetables in Changchun, the capital of Jilin Province, People's Republic of China. Pesticide residues were analyzed by gas chromatography and mass spectrometry, and the curves were highly linear at 0.01 to 1.00 μg/mL ( R 2 ≥ 0.99). The mean recovery rate of the pesticides was 62 to 110% (relative standard deviation of <5%). The limit of detection was 0.0001 to 0.0167 mg/kg, the limit of quantification was 0.0002 to 0.0556 mg/kg, and the overall detection rate was 28.43%. The prevalence of pesticides and of samples above the standard limit were highest in celery, the prevalence of pesticides was lowest in potatoes, and the prevalence of samples above the standard limit was lowest in cucumber. Three of the 18 pesticides were not detected: omethoate, chlorpyrifos, and fenvalerate. Among the 15 pesticides detected, the maximum risk factor of six (carbofuran, omethoate, phorate, dicofol, dimethoate, and dichlorvos) is >1, indicating possible harm to human health. Residues of a single pesticide may not adversely affect a person's health, but multiple pesticide residues could present a health risk.
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高影响因子
PLANT CELL TISSUE AND ORGAN CULTURE
·
2021
·Vol. 147
·期 2
·389-404
·
IF 2.711
Shi Min,Hua Qiang,Kai Guoyin
Phenolic acids and tanshinones are important bioactive components with multiple pharmacological properties accumulated in traditional Chinese medicinal plant Salvia miltiorrhiza . Abscisic acid (ABA) is effective to enhance the content of the two compounds in S. miltiorrhiza , while the regulation mechanism remains unknown. Deep transcriptome profile of S. miltiorrhiza hairy roots treated with ABA was conducted. Totally, 42,710 unigenes with the average length of 1,157 bp were obtained from de novo assembly from about 2.81 billion produced clean reads, of which 27,641 unigenes (64.72%) were successfully annotated. Unigenes encoding key enzymes such as PAL, TAT, C4H, RAS, CYP98A14, GGPPS expressed significantly higher than that in control. Candidate laccases showing similar expression with RAS and CYP98A14 in phenolic acid biosynthesis and potential P450 unigenes involved in tanshinone biosynthesis genes were screened out. Furthermore, transcription factor (TF) profiles revealed that 1,250 TFs representing 35 families were identified, of which MYB, AP2/ERF, bHLH and bZIP were most abundant. The present study provided a comprehensive transcriptional expression profile affected by ABA, which will help underly the biosynthesis and regulation mechanism.
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Crystals
·
2021
·Vol. 11
·期 9
·1132
·
IF 2.589
Lianxing Liao,Kunhua Quan,Xiangshi Bin,Ruosheng Zeng,Tao Lin
Bandgap tunability through ion substitution is a key feature of lead halide perovskite nanocrystals (LHP-NCs). However, the low stability and low luminescent performance of CsPbCl3hinder their full-color applications. In this work, quantum confinement effect (QCE) was utilized to control the bandgap of CsPbBr3NCs instead of using unstable CsPbCl3, which possess much higher emission efficiency in blue spectra region. Studies of microstructures, optical spectra and carrier dynamics revealed that tuning the reaction temperature was an effective way of controlling the NC sizes as well as QCE. Furthermore, the obtained CsPbBr3NCs were encapsulated in a PDMS matrix while maintaining their size distribution and quantum-confined optoelectronic properties. The encapsulated samples showed long-term air and water stability. These results provide valuable guidance for both applications of LHP-NCs and principal investigation related to the carrier transition in LHP-NCs.Keywords:lead halide perovskites;nanocrystals;quantum confinement effect;carrier lifetimes
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COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
·
2018
·
IF 2.829
Jing Peng,Dongyan Tang,Shuyue Jia,Yue Zhang,Zhaojie Sun,Xu Yang,Hongyun Zou,Haitao Lv
In situ formation of nanocrystals within thermoresponsive microgels has become a significant technology in the fields of catalysis and biomedicine to fabricate multifunctional hybrid nanostructures . Usually, the room temperature or cooler was set to control the formation of nanocrystals using microgels as template in such process. Here, the relatively higher temperature was used to synthesize molybdenum oxide nanocrystals where the poly( N -vinyl caprolactam) microgels were found to work as both the stabilizer and the template. Specifically, ethanol was added in the solution of the microgels to raise their volume phase transition temperature (VPTT). Later, a modified hydrothermal process was performed at 70 °C with precursor molybdic acid concentrated in the microgels matrix through the hydrogen bond between molybdic acid and N -vinyl caprolactam units. 2D nanoflakes , nanorods and nanoplatelets of molybdenum oxide were successfully synthesized. Specially, the microgels with the crosslinked degree of 2% exhibited well hybrid with controlled sizes and ideal confine of the molybdenum oxide nanoplatelets within microgels, along with strong photoluminescence intensity. These results emphasized the feasibility of poly( N -vinyl caprolactam) microgels as template and stabilizer at high temperature and provided a novel synthesis strategies for hybrid microgels applicable in wide areas of nanotechnology from catalysis, sensing to therapy.
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MOLECULAR MICROBIOLOGY
·
2016
·Vol. 103
·期 4
·713-728
·
IF 3.761
Tan-Jun Wang,Yi-Ming Shan,Han Li,Wei-Wang Dou,Xin-Hang Jiang,Xu-Ming Mao,Shui-Ping Liu,Wen-Jun Guan,Yong-Quan Li
Summary Antibiotic-producing microorganisms have evolved several self-resistance mechanisms to prevent auto-toxicity. Overexpression of specific transporters to improve the efflux of toxic antibiotics has been found one of the most important and intrinsic resistance strategies used by many Streptomyces strains. In this work, two ATP-binding cassette (ABC) transporter-encoding genes located in the natamycin biosynthetic gene cluster, scnA and scnB , were identified as the primary exporter genes for natamycin efflux in Streptomyces chattanoogensis L10. Two other transporters located outside the cluster, a major facilitator superfamily transporter Mfs1 and an ABC transporter NepI/II were found to play a complementary role in natamycin efflux. ScnA/ScnB and Mfs1 also participate in exporting the immediate precursor of natamycin, 4,5-de-epoxynatamycin, which is more toxic to S. chattanoogensis L10 than natamycin. As the major complementary exporter for natamycin efflux, Mfs1 is up-regulated in response to intracellular accumulation of natamycin and 4,5-de-epoxynatamycin, suggesting a key role in the stress response for self-resistance. This article discusses a novel antibiotic-related efflux and response system in Streptomyces , as well as a self-resistance mechanism in antibiotic-producing strains.
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危险品化学品经营许可证（带存储）