JOURNAL OF THE SCIENCE OF FOOD AND AGRICULTURE
·
2013
·Vol. 94
·期 7
·1403-1408
·
IF 1.759
Shixiang Xu,Fujie Yan,Zhendan Ni,Qianru Chen,Hui Zhang,Xiaodong Zheng
BACKGROUND Many essential oils were reported to be used as natural, environmental friendly antimicrobial agents. The antifungal activity in vitro and in vivo of an essential oil extracted from Chinese local Laurus nobilis leaves against Alternaria alternata has been studied . RESULT The main components of the essential oil were investigated by means of gas chromatography–mass spectrometry and 14 components were identified. The main ones were eugenol, caryophyllene and cinnamaldehyde. The antifungal test showed that at 800 µg mL −1 of L. nobilis oil completely inhibited the growth of A. alternata . In addition, the conidial germination of the pathogen was significantly inhibited at 200 µg mL −1 , and the weight of mycelia efficiently decreased at 500 µg mL −1 . The in vivo assay indicated that 500 µg mL −1 L. nobilis oil was effective in protecting cherry tomatoes ( Lycopersicon esculentum ) from infection of A. alternata , with an inhibition ratio of 33.9%. Scanning electron microscopy observations of the pathogen revealed significant morphological alterations in the hyphae . CONCLUSION This work suggested that L. nobilis oil could be used as a potential fungicide to control the post-harvest disease caused by A. alternata . © 2013 Society of Chemical Industry
研究领域:
植物学
·
真菌学
·
食品科学
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DOI
高影响因子
JOURNAL OF APPLIED POLYMER SCIENCE
·
2022
·Vol. 139
·期 44
·e53100
·
IF 3.057
Yong Guo,Hu Rong,Yuan Yu,Tingting Chen,Zhongwei Chen,Yifan Suo,Qingwu Zhang,Changxin Li,Juncheng Jiang
Piperazinyl phenyl phosphate (PPOP) and 4,4-diaminodiphenylmethyl phenyl phosphate (DPOA) containing phosphorus and nitrogen elements as flame retardants applied for epoxy resin (EP) were successfully synthesized, and substantiated by Fourier transform infrared spectra (FTIR), 1 H and 31 P nuclear magnetic resonance (NMR) and elemental analysis (EA). The limiting oxygen index (LOI) of the EP composites with 3 wt% of PPOP and DPOA attained 33.6% and 34.2%, both acquired the UL-94 V-0 rating, respectively. The peak of heat release rate (pHRR), the total heat release (THR) and the total smoke production (TSP) of EP/PPOP-1 decreased by 21.0%, 25.6%, and 18.7%, respectively. For EP/DPOA-1, the pHRR, THR, and TSP were brought down by 23.5%, 21.8%, and 26.4%, respectively. Flame-retardant mechanisms were explicitly evaluated by the scanning electron microscope (SEM), Raman spectroscopy and thermogravimetric analysis-infrared spectrometry (TG-IR). This proposed method not only could produce efficient flame retardant for EP but provide new ideas for replacing existing halogenated flame retardants.
研究领域:
材料科学
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化学工程
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产品关联
DOI
高影响因子
Scientific Reports
·
2018
·Vol. 8
·期 1
·1-9
·
IF 4.122
Li Yongfei,Wang Yanling,Wang Kun,Gomado Foster,Wang Gangxiao,Tang Longhao,Rong Xufeng
The wettability of the formation is critical for the flow back of the fracturing fluid and can further affect the gas production. So it is very necessary to study the wettability of shale reservoir. Here, a novel fluorocarbon surfactant, N-ethyl-N-hydroxyethyl perfluorooctanoamide, was synthesized and characterized by different methods. the contact angles of water and n-decane on the shale increased from 36° and 0° to 121° and 105°, respectively, after treated by N-ethyl-N-hydroxyethyl perfluorooctanoamide (0.5 wt.%). The surface free energy reduced from 72 mN/m to 7.4 mN/m. The results agreed with that of imbibition and capillary tube rise test. Additionally, the analysis of scanning electron microscope (SEM) and energy dispersive spectroscopy (EDS) showed that the roughness of shale surface remarkably increased. These results fully proved that the shale wettability is changed to super gas-wetting. Besides, the thermal analysis revealed that the novel fluorocarbon surfactant has good thermal stability. This indicates that it can be better applied to reservoir modifications at higher temperatures.
研究领域:
石油工程
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材料科学
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产品关联
DOI
PubMed
高影响因子
PETROLEUM SCIENCE AND TECHNOLOGY
·
2017
·
IF 0.655
Ya Lu,Lingyan Jia
The main object of this work was to compare the corrosion powers of acidic species: naphthenic acid, fatty acid and aromatic acid which were found in petroleum fraction. They were blended into base oils to formulate three simulate oils (E, F and G) with the same TAN values of 2.3 mg KOH/g. AISI 316 steel surfaces immersed in oils were measured by Raman spectroscopy, energydispersive spectrum and scanning electron microscopy after 24, 48, 72 h to evaluate their corrosion. From the Raman images, the corrosion products were confirmed. Besides goethite (α-Fe(OOH)) in corrosion product E at 48 hours; magnetite (Fe3O4) in F at 24 hours; and hematite (α-Fe2O3 and α-Fe2O3) in G at 72hours, there were disordered carbons on steel E and ferric benzoate film on steel G. The contents of elements from EDS have markedly different characteristics, indicating that dominant corrosion products on steel samples resulted from three acidic species are different. The morphology in SEM also corroborated above data that corrosion products have difference. Combining the data of three measurements, the rank of corrosion power based on the formations of ferric oxides was determined: fatty acid > naphthenic acid > aromatic acid.
研究领域:
材料科学
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化学工程
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DOI
高影响因子
FOOD CHEMISTRY
·
2025
·
IF 9.8
Yanjia Liu,Tingting Bai,Daohong Wu,Maojun Yao
Metal ions can promote the aging of Baijiu and improve its sensory quality. However, the aging mechanism mediated by metal ions remains unclear. The content of esters, alcohols, and pH decreased while the acids content, viscosity, and conductivity increased after adding metal ions. 20 kinds of aroma components were identified in Baijiu including esters, acids, alcohols, and aldehydes by Gas chromatography-mass spectrometry (GC–MS). Spectroscopy and electrochemical analysis demonstrated that Fe 3+ has a higher affinity than Cu 2+ for the flavor compounds, and both Fe 3+ and Cu 2+ exhibit stronger affinity with acids than corresponding esters. Scanning Electron Microscope (SEM) demonstratesd that Baijiu can form lamellar, spherical, flower-like, and crystal-like morphology during aging. The colloidal particles exhibit different elemental composition according to Energy Dispersive Spectrometer (EDS). These results indicated Baijiu aging is regulated by transition metal ions, thereby providing a theoretical foundation for Baijiu aging by selecting appropriate aging medium and storage conditions.
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产品关联
DOI
PubMed
高影响因子
Urological Science
·
2019
·Vol. 30
·期 5
·206
·
IF 0
Upadhyay Jyoti,Tiwari Nidhi,Rana Mahendra,Bisht Satpal S.
Background: Pesticide exposure has the potential for causing acute or chronic health effects at certain developmental stages of life. It can result in irreversible damage to structure and function of an organ. The exposure of females to pesticides before or after pregnancy is a matter of concern because of the possibility of having a child born with congenital disorders and developmental defects. Prenatal exposure of any toxicants can program the developing foetus to develop diseases that manifest in later life. Very few reports are available related to the pesticide exposure induced morphological changes in kidney which has prompted us to undertake this research study. Aim: The aim of this study is to evaluate the effect of pesticide, chlorpyrifos on the kidney development of rat neonates after being exposed prenatally to pesticides throughout their gestational period. Materials and Methods: Virgin female wistar rats weighing 200-250 gms were mated with adult males. It consisted of twelve, divided into two sub groups six rats per each were treated with selected pesticides, chlorpyrifos (insecticide) readily available commercially for various agricultural and non-agricultural settings. Insecticide chlorpyrifos was given at a dose of 10mg/kg per orally to the female rats throughout their gestation period. After gestation period rat neonates were sacrificed and their kidney section was processed for histopathological analysis. The SEM study of chlorpyrifos exposed kidney section of rat neonates was performed, investigating changes in morphometric and ultra-structural features of kidney in rat neonates. Results: The histopathological analysis shows morphological changes in the kidneys of prenatally pesticides exposed rat neonates markedly different from control group. Chlorpyrifos exposed neonates kidney shows damaged kidney corpuscles and glomeruli. Conclusion: This study concluded that pesticide exposure during gestation period to pregnant rats causes significant renal toxicity in their neonates.
研究领域:
毒理学
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发育生物学
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肾脏病学
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环境健康
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生殖毒理学
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分子病理学
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DOI
Insects
·
2025
·Vol. 16
·期 9
·961
·
IF 2.9
Huiman Zhang,Lele Sun,Peng Wang,Jiaoxin Xie,Yuan Guo
Simple SummaryAs a native species in China; the survival and reproduction ofApis cerana ceranaare heavily dependent on chemical signals. In the process of chemical communication, the antennae of bees serve as the primary sensing organs, and the legs also play an important role in the reception and transmission of chemical signals. In our study, scanning electron microscopy (SEM) was used to observe its legs, revealing two types of sensilla, and the ultrastructure of the tibial spur and the antennal brush was observed. The electrophysiological responses of the legs (ELG), along with Y-tube behavioral assays, were employed to validate the involvement of the bee’s legs in olfactory perception. The legs of bees at different ages showed varying degrees of significant response to nonanal and ocimene. Notably, 10-day-old bees exhibited a clear preference for nonanal and ocimene. These findings contribute to a deeper understanding of the mechanistic role of the honeybee leg in chemical signal detection, elucidating their functional characteristics in chemical communication, and providing experimental evidence for the study of bee behavioral responses and environmental adaptation.Apis cerana ceranais a key social insect, and its ability to recognize chemical signals is crucial for maintaining colony homeostasis and coordinating collective behaviors, such as foraging, nursing, and defense. The legs of insects play a significant role in gustatory perception and proximity olfactory perception. In this study, the leg sensilla ofA. c. ceranawere observed by scanning electron microscopy (SEM). Two types of sensilla were observed, including sensilla trichodea (Str I, Str II, Str III, Str IV, Str V, and Str VI) and sensilla chaetica (Sch I, Sch II, and Sch III). The two unique structures of the tibial spur (Tsp I, Tsp II) and antennal brush (Abr) are carefully observed. The electrophysiological responses of workers at different ages to diverse chemical compounds were measured via electrolegogram (ELG) recordings on their legs. The results showed that 1-day-oldA. c. ceranawas more sensitive to nonanal; 10-day-old and 25-day-oldA. c. ceranawere more sensitive to ocimene. The results of behavioral responses showed that nonanal and ocimene can significantly attract 10-day-old workers ofA. c. cerana. This study establishes a foundation for further exploration of the mechanisms by which the legs ofA. c. ceranafacilitate colony-level communication through chemical signals. It also provides an important theoretical basis for understanding their social organization and information transmission.
研究领域:
昆虫学
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神经行为学
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化学生态学
·
感觉生物学
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产品关联
DOI
PubMed
高影响因子
Horticulturae
·
2023
·Vol. 9
·期 6
·715
·
IF 3.1
Chenyu Niu,Lingling Liu,Amr Farouk,Cunkun Chen,Zhaojun Ban
Citrus fruits are susceptible to microbial infection during storage and transportation, leading to weight loss, quality deterioration and even physiological decay. In this study, a layer-by-layer (LbL) self-assembly edible coating based on chitosan and Sodium carboxymethyl cellulose (CMC) was prepared using electrostatic deposition. Postharvest citrus fruits (Citrus reticulatecv. ‘Chunxiang’) were coated either with the LbL coating, which exhibited an increased transmission rate of water vapor, or with single chitosan coating. The data of some physiological indexes of citrus coated with LbL coating and single coating were compared after being stored at 13 ± 2 °C and at relative humidity (RH) at 80–85% (shelf-life condition) for 10 days. Results demonstrated that the LbL deposited coating was effective at maintaining morphological and microstructural attributes, increasing the surface brightness, firmness and the content of titratable acid and ascorbic acid, as well as reducing the weight loss after storage by about 0.8%. Results in the present study indicated that the LbL edible coating could have the potential to maintain postharvest citrus quality during storage.Keywords:chitosan;CMC;FTIR;SEM;postharvest citrus;quality
研究领域:
食品科学
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植物病理学
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产品关联
DOI
高影响因子
Frontiers in Chemistry
·
2025
·
IF 4.2
Yang Yang,Xuemei Wei,Shuya Zhang,Yun Li,Jiazhen Wu,Suhua Cai,Biren Wang,Zhiming Yang,E. Yang,Junling Cao,Qinhua Chen,Guihong Chen
Background: Aconiti Lateralis Radix Praeparata (Fuzi), a vital yet toxic herbal medicine, faces significant challenges in standardization due to varied processing methods that undermine detoxification efficacy and hinder therapeutic optimization.Methods: An integrative analytical approach combining scanning electron microscopy (SEM), X-ray diffraction (XRD), metabolomics, and pharmacodynamic evaluation was employed to investigate the structural, compositional, and functional transformations during Fuzi processing.Results: SEM imaging and XRD data revealed that the morphological breakdown of starch granules varied according to processing technique. Metabolomics analysis based on mass spectrum identified 57 diterpenoid alkaloids, including 12 bioactive components, whose levels fluctuated across nine processing variants. Pharmacodynamic profiling revealed distinct efficacy-safety trade-offs across these variants, underscoring the pivotal role of processing methods in determining clinical risk profiles and therapeutic indices.Conclusion: This study elucidated the structure-composition-efficacy correlations in Fuzi processing, highlighting the relationship between starch reorganization, alkaloid modification, and therapeutic outcomes. These insights offer a mechanistic basis for refining traditional processing protocols, optimizing detoxification and therapeutic retention, and advancing standardization in herbal medicine.
研究领域:
中药炮制学
·
天然药物化学
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代谢组学
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药效动力学
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晶体学
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植物药标准化
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药物安全性评价
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产品关联
DOI
PubMed
高影响因子
Applied Sciences-Basel
·
2019
·Vol. 9
·期 5
·956
·
IF 2.217
Huifeng Shi,Xianqiang Liu,Rui Wu,Yijing Zheng,Yonghe Li,Xiaopeng Cheng,Wilhelm Pfleging,Yuefei Zhang
In situ scanning electron microscopy (SEM) offers a good way to investigate the structural evolution during lithiation and delithiation processes. In this paper, the dynamical morphological evolution of 3D-line-structured/unstructured Si/C composite electrodes was observed by in situ SEM. The investigation revealed the microstructural origin of large charge capacity for 3D-line-structured anodes. Based on this proposed mechanism, a coarse optimization of 3D-line-structured anodes was proposed. These results shed light on the unique advantages of using an in situ SEM technique when studying realistic bulk batteries and designing 3D electrode structures.
研究领域:
材料科学
·
电化学
·
纳米科技
·
能源存储
·
固体物理
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DOI
高影响因子
INORGANIC CHEMISTRY COMMUNICATIONS
·
2022
·
IF 3.428
Baoqin Mu,Bin Li,Bin Qi
Lanthanide metal–organic framework Ln-MOFs(Ln = Sm, Dy, Dy/Sm) were synthesized by hydrothermal method at 100 °C for 12 h using lanthanide metals (Ln = Sm, Dy, Dy/Sm) as metal ion centers and 1,3,5-benzotrioic acid (H 3 BTC) as ligands. The structural characteristics of Ln(BTC)(H 2 O)·(DMF) were characterized by X-ray Diffraction(XRD), Fourier Transform Infrared Spectroscopy(FT-IR) and Thermogravimetric Analysis(TGA). Scanning electron microscopy showed that the samples showed rod-like morphology, and the fluorescence spectra showed 478 nm and 573 nm corresponding to the characteristic transitions of 4 F 9/2 → 6 H 15/2 (blue light) and 4 F 9/2 → 6 H 13/2 (yellow light) of Dy 3+ , respectively, while orange light at 600 nm and red light at 646 nm corresponded to the characteristic transitions of 4 G 5/2 → 6 H 7/2 and 4 G 5/2 → 6 H 9/2 of Sm 3+ , demonstrating that the double-doped lanthanide metal ions MOF were successfully synthesized. H 7 (P(Mo 2 O 7 ) 6 )/(Dy/Sm-MOF) was used as a sensor for the determination of H 2 PO 4 − , the results of performance evaluation showed that the electrochemical sensor showed a linear relationship between 0.01 and 0.17 mM for H 2 PO 4 − , with a detection limit of 0.005 mM/L, good stability and reproducibility, which opened up a new way for the detection of orthophosphate dihydrogen.
研究领域:
分析化学
·
材料科学
·
电化学
·
无机化学
·
传感器技术
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DOI
高影响因子
Surfaces and Interfaces
·
2025
·
IF 6.3
Xiangfeng Meng,Zhiping Wang,Xiaoting Lv,Lihuan Hou,Hong Jin,Wenjuan Li,Junwei An,Chen Wen
A composite anti-corrosion coating with five different graphene ratios was coated on the surface of 2A12 aluminum alloy, using graphene/TiO 2 mixed powder as the anti-corrosion filler and K 2 SiO 3 water glass as the matrix. Scanning electron microscope (SEM) and X-ray diffractometer (XRD) were used to characterize the microscopic morphology, element composition, and phase composition of coatings. The corrosion resistance of the coating was appraised using electrochemical characteristics such as AC impedance and polarization curves. The surface of the coatings with low graphene content is dense and level. The surface of coatings with graphene content exceeding 0.5 g (2.5 wt.%) exhibit large-sized pits and cracks, and large corrosion products are produced after immersion in 3.5 wt.% NaCl solution. All five coatings maintained a stable phase structure before and after corrosion. Electrochemical analysis shows that the increase in graphene content leads to a first strong and then weak physical barrier effect of the coating against corrosive media. The coating with 0.25 g(1.25 wt.%) graphene exhibits the best corrosion resistance, with its |Z| 0.01H z value maintaining around 10 5 Ω·cm². When the graphene content exceeds this value, the inhibition of the coating on corroding media will be weakened by reason of particle aggregation.
研究领域:
材料科学
·
表面工程
·
腐蚀科学
·
纳米复合材料
·
电化学
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DOI
高影响因子
危险品化学品经营许可证（带存储）