Scientific Reports
·
2021
·Vol. 11
·期 1
·1-9
·
IF 4.38
Li Danqing,Chen Shuai,Zhang Ke,Gao Nan,Zhang Miao,Albasher Gadah,Shi Jiangfan,Wang Chuanyi
Silver-based antibacterial agents have obtained wide attention due to the fact that bacteria in the environment is ubiquitous, which has become one of the most difficult problems for human health. However, the antibacterial mechanism and process are still inconclusive. Here, Ag 2 O nanoparticles (NPs) with uniform spherical morphology and small size (around 30 nm) were prepared. The as-prepared Ag 2 O NPs induced high antibacterial activity (100% inhibition ratio) against E. coli . A two-step antibacterial process was proposed and confirmed, which divided into inhibition and sterilization steps. The optical density measurement, malondialdehyde concentration detection, morphologic imaging with electronic microscopy and Fourier transform infrared spectroscopic analysis unveiled the interaction of Ag 2 O NPs with E. coli , which verified the inhibition–sterilization process we proposed.
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高影响因子
ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH
·
2021
·Vol. 28
·期 20
·25503-25513
·
IF 4.223
Cong Zi-Xiang,Shao Xue-Ting,Liu Si-Yu,Pei Wei,Wang De-Gao
Illicit drug use in rural and suburban areas of China has not been studied extensively, as most studies have focused on illicit drug use in urban areas. To compare the differences between urban, suburban, and rural drug use, we collected influent samples from 19 urban, 9 suburban, and 18 rural wastewater treatment plants in Dalian, respectively. A method using solid-phase extraction combined with derivatization for gas chromatography -mass spectrometry analysis was applied to detect biomarker concentrations. The concentrations of methamphetamine and morphine ranged from 3.12 to 605 ng/L and < 2.35 to 198 ng/L, respectively. Norketamine was found in only four samples (5.56 to 14.5 ng/L), while 3,4-methylenedioxymethamphetamine and benzoylecgonine were not detected in any samples. Methamphetamine use in rural areas (16.3 mg/day/1000 inhabitant (inh), prevalence: 0.06%) was significantly lower than those in urban (77.1 mg/day/1000 inh, prevalence: 0.23%) and suburban (234 mg/day/1000 inh, prevalence: 0.70%) areas. Heroin use in suburban areas (57.6 mg/day/1000 inh, prevalence: 0.10%) was significantly higher than that in urban (13.9 mg/day/1000 inh, prevalence: 0.02%) and rural (8.68 mg/day/1000 inh, prevalence: 0.02%) areas. The results indicate relatively low levels of illicit drug use in rural areas of Dalian, related to low incomes and outflow of the working-age population. Illicit drug use was most prevalent in suburban areas of Dalian, which may be influenced by large floating populations and few anti-drug efforts in suburban areas.
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Scientific Reports
·
2021
·Vol. 11
·期 1
·1-9
·
IF 4.38
Dong Wenjing,Song Erqun,Song Yang
The acute liver injury (ALI) and hepatic fibrosis caused by the co-treatment of lipopolysaccharide (LPS)/ d -galactosamine (D-GalN) have been extensively studied. However, whether LPS/D-GalN are genotoxic has been left unknown. In this study, male mice were divided into eight groups with eight animals in each group. For acute challenge of LPS/D-GalN, the mice in each group received a combination of LPS/D-GalN via intraperitoneal injection at the dose of 25 μg/kg/250 mg/kg, 25 μg/kg/500 mg/kg, or 50 μg/kg/500 mg/kg body weight. An additional group for chronic administration of test compounds was conducted by i.p. injection of LPS/D-GalN (10 μg/kg/100 mg/kg) every other day for 8 weeks. Saline solution (0.9%) and cyclophosphamide (CTX) (50 mg/kg body weight) given by i.p. injection was used as the negative and positive control, respectively. The results of single cell gel electrophoresis (SCGE) assay indicated that acute exposure of the mice to LPS/D-GalN caused severe DNA damage in hepatic cells, but not in the brain, sperm or bone marrow cells, which evidenced the genotoxicity of LPS/D-GalN administrated in combination. Interestingly, the chronic administration of LPS/D-GalN triggered significant genotoxic effects not only in hepatic but also in brain cells, with negative results in sperm and bone marrow cells. Histopathological examination in the liver and brain tissues revealed changes consistent with the SCGE results. The present study indicates genotoxic potential of LPS/D-GalN co-administered in mice, which may serve as an in vivo experimental model for relevant genotoxic study.
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FIBERS AND POLYMERS
·
2021
·Vol. 22
·期 2
·396-404
·
IF 2.153
Zhang Lu,Zhou Qingquan,Zhang Qipeng,Wu Minghua
To further improve the color yield and color fastness of disperse dyes (DDs) in washing-free printing, fluorosilicone-modified polyacrylate (FSMPA) was prepared as a new washing-free printing binder. The structure, thermal behaviors, surface characteristics, and washing-free printing properties of FSMPA were intensively investigated. The migration-diffusion-fixation mechanisms of DDs from a polymer binder film to PET were tentatively explored. The results showed that when the molar ratio of 1,3,5-tris(3,3,3-trifluoropropyl) methylcyclotrisiloxane (D 3 F ) to octamethylcyclotetrasiloxane (D 4 ) was 1:10 in the preparation of the modifier double-terminated vinyl polyfluoroalkyl siloxane (DVFS) and the dose of DVFS in the preparation of FSMPA was 9%, the printed polyester fabric exhibited excellent washing-free printing properties. Compared with polyacrylate (PA) and silicon-modified polyacrylate (SMPA), FSMPA has better color yield and color fastness. The glass transition temperature of FSMPA was decreased, the enrichment of fluorosilicone chains on the surface of FSMPA film was facilitated, and the hydrophobicity of FSMPA was improved. Thus, the difference in solubility parameters between the DDs and polymer binder film was increased, and the migration of the DDs from the FSMPA film to the PET substrate was promoted.
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IN VITRO CELLULAR & DEVELOPMENTAL BIOLOGY-PLANT
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2021
·Vol. 57
·期 3
·372-379
·
IF 2.252
Li Xiuyu,Zhang Zijie,Ren Yunhui,Feng Yue,Guo Qi,Dong Li,Sun Yuhan,Li Yun
Tetraploid black locust ( Robinia pseudoacacia L.) has advantages over diploid varieties in growth and stress resistance. Previous studies had shown that tetraploid black locust can be induced only by treating shoot tips of the germinating seeds with colchicine. In order to establish a simpler and more efficient tetraploid induction method in black locust, we induced tetraploid plants by treating the hypocotyls from in vitro –grown seedlings with different concentrations of colchicine, and then provided a method for tetraploid identification based on stomatal size and density in this study. The highest induction efficiency was 53.33% by treating hypocotyl explants with 70 mg·L −1 colchicine for 2 d. Tetraploid black locust was significantly different from diploid in morphological characteristics. Leaf area, leaf thickness, chlorophyll content, stomatal length, and stomatal width were greater in tetraploid plants than in diploid plants, whereas the opposite was true for leaf aspect ratio, stomatal index, and stomatal density. The differences in stomatal size and density between diploid and tetraploid were nearly two times; therefore, size and density of stomata can be used as a stable and distinct marker to rapidly screen tetraploids. The results of this study suggested that the hypocotyl was an ideal material to induce tetraploid black locust in vitro and confirmed that stomatal size and density could be an effective and reliable marker to identify ploidy level in black locust.
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JOURNAL OF MATERIALS SCIENCE
·
2021
·Vol. 56
·期 11
·6814-6829
·
IF 4.22
Zeng Guangyong,Lin Qingquan,Wei Ke,Liu Yongcong,Zheng Size,Zhan Yingqing,He Shuangjiang,Patra Tanmoy,Chiao Yu-Hsuan
With unique structural and physicochemical properties, the upcoming two-dimensional (2D) materials have become promising candidates for the design and fabrication of high-performance membranes. In this work, for the first time, the dopamine-functionalized graphene oxide (DGO) nanosheets were intercalated into the MXene (Ti 3 C 2 T x ) nanosheets, and subsequently, a series of novel DGO/MXene composite membranes were prepared via vacuum filtration on hydrophilic polyvinylidene fluoride (PVDF) membranes as the support layer. The effect of mass ratios between DGO and MXene on the resulting membrane structure and overall performances were systematically investigated in detail. Incorporation of DGO increased the mechanical stability of composite membrane, but reduced its interlayer spacing. The most suitable composite membrane, M4 (MXene: DGO = 1:2) with nearly 2 µm thickness of functional layer, exhibited an excellent dye rejection ratio 98.1% (for Direct Red 28) and 96.1%( for Direct Black 38) as along with a high value of water flux (63.5 Lm −2 h −1 ) at a pressure of 0.1 MPa, compared with the pure MXene and DGO membranes. Furthermore, molecular dynamics (MD) simulation indicated that the permeation rate of water molecules across the active layer was directly determined by the interlayer spacing of nanosheets. Additionally, composite membrane M4 displayed a relatively low rejection ratio of differently charged salts (9.7% for Na + ) and (4.3% Mg 2+ ).
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Horticulture Research
·
2021
·
IF 6.793
Zhou Wei,Shi Min,Deng Changping,Lu Sunjie,Huang Fenfen,Wang Yao,Kai Guoyin
Water-soluble phenolic acids are major bioactive compounds in the medicinal plant species Salvia miltiorrhiza. Phenolic acid biosynthesis is induced by methyl jasmonate (MeJA) in this important Chinese herb. Here, we investigated the mechanism underlying this induction by analyzing a transcriptome library of S. miltiorrhiza in response to MeJA. Global transcriptome analysis identified the MeJA-responsive R2R3-MYB transcription factor-encoding gene SmMYB1. Overexpressing SmMYB1 significantly promoted phenolic acid accumulation and upregulated the expression of genes encoding key enzymes in the phenolic acid biosynthesis pathway, including cytochrome P450-dependent monooxygenase (CYP98A14). Dual-luciferase (dual-LUC) assays and/or an electrophoretic mobility shift assays (EMSAs) indicated that SmMYB1 activated the expression of CYP98A14, as well as the expression of genes encoding anthocyanin biosynthesis pathway enzymes, including chalcone isomerase (CHI) and anthocyanidin synthase (ANS). In addition, SmMYB1 was shown to interact with SmMYC2 to additively promote CYP98A14 expression compared to the action of SmMYB1 alone. Taken together, these results demonstrate that SmMYB1 is an activator that improves the accumulation of phenolic acids and anthocyanins in S. miltiorrhiza. These findings lay the foundation for in-depth studies of the molecular mechanism underlying MeJA-mediated phenolic acid biosynthesis and for the metabolic engineering of bioactive ingredients in S. miltiorrhiza.
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JOURNAL OF MATERIALS SCIENCE
·
2020
·Vol. 56
·期 3
·2763-2776
·
IF 3.553
Yu Yucong,Shi Xiaolong,Liu Lin,Yao Juming
Nowadays high porosity aerogels are widely applied in wastewater purification, while the fragility and unversatility of nascent cellulose aerogels limited the application in oil/water filtering separation. Here, highly compressible, elastic, superhydrophobic cellulose/poly(vinyl alcohol) (PVA) composite aerogels were fabricated via combination of chemical cross-linking, freeze drying and silanization. The obtained cellulose/PVA aerogels exhibited durable superhydrophobicity with WCA of 156.6 °, even maintaining 155.0 ° after 30 days. Synergistic effects of physical entanglement, chemical cross-linking and H-bond network between cellulose and PVA molecular chains endowed the aerogels with excellent compressibility and recoverability. The aerogels exhibited maximum compressive stress of 490.7 kPa at 90% strain, even without reduction in mechanical strength under 70% compressive strain for 10 cycles. More importantly, the strengthened aerogels exhibited remarkable separation performances for both immiscible oil/water mixtures and surfactant-stabilized water-in-oil emulsions. Fascinating permeation flux of up to 7176.3 L m −2 h −1 and total separation amount as high as 4550.6 L m −2 with separation efficiency of 98.5% for water-in-cyclohexane emulsion were harvested. Thus, this work provides a green, sustainable and mass-producible cellulose-based aerogel for high-efficiency oily wastewater remediation.
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RARE METALS
·
2020
·Vol. 40
·期 7
·1785-1800
·
IF 2.161
Pan Cheng,Huang Ben-Hua,Fan Chao,Li Xiao-Yong,Su Pei-Gen,Zheng A-Qun,Sun Yang
Abstract Cerium dioxide has a comparatively lower Ce 4+ /Ce 3+ redox pair, which leaves abundant oxygen vacancies on oxide lattice, also making incorporation of foreign ion and subsequent applications feasible and convenient. In this work, a series of cerium–yttrium mixed oxides were prepared by using polyvinylpyrrolidone as major template through sol–gel, which were further employed as catalyst for dehydration of aniline with formic acid into N-phenylformamide. Characterizations reveal that synthetic samples have a variety of morphologies including nanoparticle, microflower, and uniform microrods. The monitoring of particle size, zeta potential, and ultraviolet-visible (UV–Vis) of preparative solution indicate that self-assembly of polyvinylpyrrolidone and its subsequent reaction with metal ion determines sample morphology. In catalytic dehydration, all samples show high dehydration efficiencies that are comparable to those from anhydrous Na 2 SO 4 and combination of dicyclohexylcarbodiimide with 4-dimethylaminopyridine and dichloromethane shows better outputs than water. In association with structural analysis, cerium looks more active than yttrium, while yttrium mainly plays as a structure-directing and pore-forming agent. This study may contribute to micro-/nanofabrication of rare earth composites and their catalytic applications. Graphic abstract
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JOURNAL OF THERMAL ANALYSIS AND CALORIMETRY
·
2020
·Vol. 146
·期 3
·1063-1076
·
IF 2.731
Jiao Enxiang,Wu Kun,Qu Zhencai,Liu Yingchun,Lu Maoping,Nan Bingfei,Chen Weilong,Liang Liyan
In this work, phosphomolybdic acid (PMoA) was used as a kind of eco-friendly flame retardant precursor. Then, a green intrinsic flame retardant was successfully prepared by chemically modifying PMoA with imidazolium (IM), which can be well dispersed in epoxy matrix without using any solvent. DSC results demonstrated that IM-PMoA can chemically react with epoxy monomer under heating with a moderate heat release, which greatly reduced the migration resistance of PMoA in water (1.2871% vs. 0.0439%). Meanwhile, curing kinetics indicates EP/IM-PMoA composites have higher activation energy (98.06 kJ mol −1 ) than pure EP (75.48 kJ mol −1 ). Besides, epoxy composite can pass V-0 rating with 8 mass% IM-PMoA addition. Compared to pure epoxy, the obvious decrease in the values of peak heat release rate and total smoke release were 37.78% and 31.03%, respectively. In addition, Raman spectrum indicated that the residual carbon is highly graphitized, which may be attributed to the superb catalytic carbonation ability of PMoA. The high-quality char layer can be used as physical barrier for inhibiting the heat diffusion and degradant transfer. As a result, excellent flame retardant and smoke suppression properties were achieved. This work provides a new idea to prepare a green intrinsic flame retardant for epoxy based on imidazolium.
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CATALYSIS LETTERS
·
2020
·Vol. 151
·期 2
·538-547
·
IF 2.482
Chen Han,Xu Qiong,Li Hui,Liu Jian,Liu Xianxiang,Huang Geng,Yin Dulin
Nickel supported on equilibrium fluid-catalytic-cracking catalysts (Ni/E-cats) were prepared by a simple grinding-pyrolysis method and employed for the transfer hydrogenation of ethyl levulinate (EL) to γ-valerolactone (GVL). 96.2% selectivity of GVL and 90.3% conversion of EL were obtained at 180 °C for 6 h over 30-Ni/E-cat. Through XRD, N 2 adsorption–desorption, NH 3 -TPD and SEM analysis, the high activity of the 30-Ni/E-cat catalyst was attributed to its dispersed Ni metal active centers and available acidic sites. Catalytic probe test revealed that metal and acid sites of Ni/E-cat played a synergistic catalytic role in the synthesis of GVL in 2-propanol, where Ni metal sites contribute to the hydrogenation of ketone group in EL, and acid sites of E-cat promoted the lactonization of intermediate ethyl- or isopropyl 4-hydroxyvalerate. Two reaction pathways and synergistic mechanism were proposed in this catalytic system. Moreover, Ni/E-cat catalyst exhibited good stability up to four cycles without obvious loss of catalytic activity. Graphic Abstract
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JOURNAL OF MATERIALS SCIENCE
·
2020
·Vol. 55
·期 31
·15252-15262
·
IF 3.553
Jiang Xiaoli,He Miao,Tang Mengyi,Zheng Qiaoji,Xu Chenggang,Lin Dunmin
Electrocatalytic nitrogen reduction reaction (NRR) under ambient conditions has been considered as a promising approach for green ammonia synthesis; however, non-precious metal-based catalysts with excellent NRR electrocatalytic performance have been scarce. Herein, self-supported bimetallic electrocatalysts of Ni 12 P 5 /FeP 4 nanoplates grown on carbon cloth were synthesized by a combined process of hydrothermal technology and low-temperature phosphidation. The catalyst exhibits excellent electrocatalytic N 2 fixation performance with a high NH 3 yield rate of 3.08 × 10 −10 mol s −1 cm −2 (16.40 μg h −1 mg −1 cat
), Faradaic efficiency (39.9%) as well good durability at − 0.1 V in 0.1 M Na 2 SO 4 at ambient conditions, which are attributed to the distinctive nanostructure and rational composition. Our study paves the way for expanding the scope of NRR research and designing more efficient electrochemical ammonia synthesis in the future.
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