16 results on '"Zhou, Jinhui"'
Search Results
2. Occurrence of Neonicotinoids in Chinese Apiculture and a Corresponding Risk Exposure Assessment
- Author
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Dave Goulson, Li Yi, Shupeng Yang, Chen Lanzhen, Xinran Wang, Jin Yue, Zhao Wen, Zhou Jinhui, and Jinzhen Zhang
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China ,Insecticides ,Beekeeping ,animal structures ,010501 environmental sciences ,Risk Assessment ,01 natural sciences ,Toxicology ,Neonicotinoids ,Animals ,Environmental Chemistry ,Risk exposure ,Risk ranking ,Apis cerana ,0105 earth and related environmental sciences ,biology ,digestive, oral, and skin physiology ,fungi ,Neonicotinoid ,food and beverages ,General Chemistry ,Bees ,Nitro Compounds ,biology.organism_classification ,Acute exposure ,behavior and behavior mechanisms ,Plant species ,Risk assessment - Abstract
Neonicotinoids are the most widely used insecticides worldwide, but there is mounting evidence demonstrating that they have adverse effects on nontarget organisms. However, little is known about the extent of environmental neonicotinoids contamination in China. In this study, a total of 693 honey samples from across China, from both Apis melifera and Apis cerana, were analyzed to examine neonicotinoid concentrations and their geographical distribution, and correlation with the primary plant species from which the honey was obtained. Furthermore, chronic and acute exposure risk and risk ranking for humans eating honey were investigated, and risks to bees were also considered. The results revealed that 40.8% of the samples contained at least one of the five neonicotinoids tested. Honeys from commercial crops were found to be more frequently contaminated with neonicotinoids than those from noncommercial crops. Honey samples from Apis mellifera were more frequently contaminated than those from Apis cerana. The concentrations of neonicotinoids found in honey overlapped with those that have been found to have significant adverse effects on honeybee health. The dietary risk assessments indicated that the levels of neonicotinoids detected in honey were likely to be safe for human consumption.
- Published
- 2020
3. Polyphenol-Rich Extracts from Brown Macroalgae Lessonia trabeculate Attenuate Hyperglycemia and Modulate Gut Microbiota in High-Fat Diet and Streptozotocin-Induced Diabetic Rats
- Author
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Yiqiang Li, Yanfen Zheng, Geng Yuting, Ping Zou, Yuan Yuan, Zhou Jinhui, and Chengsheng Zhang
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0106 biological sciences ,chemistry.chemical_classification ,Antioxidant ,biology ,Chemistry ,medicine.medical_treatment ,Insulin ,010401 analytical chemistry ,food and beverages ,Fatty acid ,Blood sugar ,General Chemistry ,Streptozotocin ,01 natural sciences ,Phlorotannin ,0104 chemical sciences ,Polyphenol ,Alpha-glucosidase ,medicine ,biology.protein ,Food science ,General Agricultural and Biological Sciences ,010606 plant biology & botany ,medicine.drug - Abstract
Brown macroalgae are an important source of polyphenols with multiple health functions. In this work, polyphenol extracts from Lessonia trabeculate were purified and investigated for the antidiabetic activity in vitro and in vivo. The purified polyphenol extracts exhibited good antioxidant activities, α-glucosidase and lipase inhibition activities (IC50 < 0.25 mg/mL). The HPLC-DAD-ESI-MS/MS analysis indicated that the compounds in polyphenol extracts were mainly phlorotannin derivatives, phenolic acid derivatives, and gallocatechin derivatives. In vivo, C57BL/6J rats treated with polyphenol extracts for 4 weeks had lower fasting blood glucose levels, insulin levels, as well as better serum lipid profiles and antioxidant stress parameters, compared with the diabetic control (DC) group. Histopathology revealed that polyphenol extracts preserved the architecture and function of the liver. Short-chain fatty acid contents in rats' fecal samples with polyphenols administration were significantly recovered as compared with the DC group. Furthermore, the gut microflora of rats was investigated with high-throughput 16S rRNA gene sequencing and results indicated that polyphenol extracts had a positive effect on regulating the dysbiosis of the microbial ecology in diabetic rats. All of the results from the study provided a scientific reference of the potentially beneficial effects of L. trabeculate polyphenols on diabetes management.
- Published
- 2019
4. Chemical characterization and bioactivities of polysaccharides from Apocynum venetum leaves extracted by different solvents
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Yuan Yuan, Jing Changliang, Chengsheng Zhang, Zhou Jinhui, Zou Ping, San Zhou, Li Yiqiang, and Zongchang Xu
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food.ingredient ,Pectin ,DPPH ,General Chemical Engineering ,ved/biology.organism_classification_rank.species ,Polysaccharide ,01 natural sciences ,Industrial and Manufacturing Engineering ,chemistry.chemical_compound ,0404 agricultural biotechnology ,food ,Apocynum venetum ,Hemicellulose ,Safety, Risk, Reliability and Quality ,chemistry.chemical_classification ,ABTS ,Chromatography ,ved/biology ,010401 analytical chemistry ,Extraction (chemistry) ,04 agricultural and veterinary sciences ,040401 food science ,0104 chemical sciences ,chemistry ,Polyphenol ,Food Science - Abstract
Apocynum venetum has a long history as a Chinese traditional tea. As one of the major components, polysaccharides from Apocynum venetum leaves were extracted with acid (HCl), distilled water and alkaline (NaOH) to study the effect of the extraction solvents on their chemical composition and biological activities in this work. Monosaccharide composition revealed that polysaccharides from acidic and distilled water extraction were pectic polysaccharides, while those from alkaline extraction consisted of pectin and hemicellulose. Chemical analysis and FT-IR spectra indicated the co-extraction of protein and polyphenol contents in alkaline extracted polysaccharides, which exhibited strongest antioxidant and digestive enzyme inhibition activities. The antioxidant capacities were 185.26–286.30 mg TE/g for DPPH radical scavenging, 409.06–502.00 mg TE/g for ABTS radical scavenging, and 152.12–260.70 mg TE/g sample for reducing power assay, respectively. The lowest IC50 for α-glucosidase and lipase inhibition activities were 16.75 μg/mL and 820 μg/mL, respectively. Further purification of alkaline extracts was carried out and characterized. The results showed that acid hydrolysis could successfully reduce polyphenol and protein contents, and purified polysaccharides showed even higher antioxidant activities and α-glucosidase inhibition activity. These results provide a scientific support for functional application and extraction of polysaccharides from Apocynum venetum leaves.
- Published
- 2019
5. Identification and Validation of Stable Reference Genes for Gene Expression Analysis in Sword-leaf Dogbane Using Quantitative Reverse Transcriptase Polymerase Chain Reaction
- Author
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Chengsheng Zhang, Han Liu, Zongchang Xu, Meng Wang, Zhou Jinhui, and Yiqiang Li
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0106 biological sciences ,0301 basic medicine ,Quantitative reverse transcriptase ,Dogbane ,Horticulture ,Biology ,01 natural sciences ,Molecular biology ,law.invention ,03 medical and health sciences ,030104 developmental biology ,law ,Reference genes ,Gene expression ,Genetics ,Identification (biology) ,Polymerase chain reaction ,010606 plant biology & botany - Abstract
Sword-leaf dogbane (Apocynum venetum) is a traditional Chinese herb with increasingly recognized potential to enhance health, but no study of stable reference genes in this herb has been reported. Based on a homologous cloning strategy, we have successfully cloned five candidate reference genes from sword-leaf dogbane: glyceraldehyde-3-phosphate dehydrogenase (AvGAPDH), beta tubulin (AvbTUB), polyubiquitin (AvUBQ), elongation factor 1-alpha (AvEF1α), and actin (AvACTIN). Three distinct algorithms, geNorm, NormFinder, and BestKeeper, were used to estimate the expression stability of candidate reference primer pairs. We found that AvACTIN-2 and AvACTIN-3 presented the highest stability of expression in different tissue samples, and AvGAPDH-2 was most stable under salinity stress. In addition, we illustrated the application of these new reference genes by assaying the expression levels of two hyperoside biosynthesis terminal enzyme genes, flavonoid 3′-hydroxylase (F3′H) and flavonol synthase (FLS), under salinity stress. Our study is the first to report stable expression of internal reference genes in sword-leaf dogbane in multiple experimental sample sets.
- Published
- 2018
6. Salt stress decreases seedling growth and development but increases quercetin and kaempferol content in Apocynum venetum
- Author
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Han Liu, Z. Xu, Zhou Jinhui, T. Ren, Chao Zhang, Yan Li, and Du Haina
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0106 biological sciences ,ved/biology.organism_classification_rank.species ,Plant Science ,Biology ,Sodium Chloride ,010603 evolutionary biology ,01 natural sciences ,Salt Stress ,chemistry.chemical_compound ,Flavonols ,Gene Expression Regulation, Plant ,Halophyte ,Apocynum venetum ,Kaempferols ,Ecology, Evolution, Behavior and Systematics ,chemistry.chemical_classification ,ved/biology ,fungi ,food and beverages ,General Medicine ,biology.organism_classification ,Horticulture ,Flavonoid biosynthesis ,chemistry ,Germination ,Seedling ,Apocynum ,Seedlings ,Quercetin ,Growth and Development ,Kaempferol ,010606 plant biology & botany - Abstract
Apocynum venetum L. is a traditional Chinese medicinal herb with great potential to treat angiocardiopathy. Its major medicinal constituents are flavonoids. However, the natural habitats of A. venetum are typically affected by salt stress, which can modify both biomass and accumulation of medicinal compounds. In this study, the effects of salt stress on growth and development of A. venetum, accumulation of flavonoids and expression patterns of genes involved in flavonoid biosynthesis were evaluated. In general, the growth and development of seedlings (seedling height, root length, leaf length, leaf width and seed germination) were inhibited by salt stress. Unlike typical halophytes, there was no optimal NaCl concentration range that promoted growth and development, but seedlings had an elevated DW/FW ratio under salt stress (induced by irrigation with 50, 100, 200 or 400 mm NaCl). Furthermore, quercetin and kaempferol were significantly accumulated in A. venetum seedlings under salt stress, resulting in a balanced content and reduced FW. Moreover, the expression of AvCHS, AvCHI and AvF3GT was inhibited by salt stress; however, AvF3'H, AvF3H and AvFLS, which are involved in the flavonol synthesis pathway, were up-regulated under salt stress, consistent with a decrease in total flavonoids and an increase of flavonols (quercetin and kaempferol). In summary, cultivation of A. venetum in saline soils appeared to be feasible and improved the medicinal quality of A. venetum (quercetin and kaempferol accumulation under salt stress), thus this species can effectively utilize saline soil resources.
- Published
- 2020
7. Coordinated dispatch of multi-energy system with district heating network: Modeling and solution strategy
- Author
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Xuesong Zhang, Zhou Jinhui, Chenyu Wu, Wei Gu, and Shuai Lu
- Subjects
Flexibility (engineering) ,Mathematical optimization ,Computer science ,020209 energy ,Mechanical Engineering ,Mass flow ,Linear system ,02 engineering and technology ,Building and Construction ,Pollution ,Industrial and Manufacturing Engineering ,Cogeneration ,General Energy ,020401 chemical engineering ,Convergence (routing) ,0202 electrical engineering, electronic engineering, information engineering ,Effective method ,0204 chemical engineering ,Electrical and Electronic Engineering ,Energy system ,Civil and Structural Engineering ,Network model - Abstract
This paper proposes a dispatch strategy for the multi-energy system (MES) that utilizes the district heating network (DHN) to realize the heat power interaction of multi cogeneration system, so as to improve the operational flexibility. A novel model for the DHN that couples multi heat sources and is under quantity regulation is proposed, based on which an optimal coordinated dispatch model (OCDM) for the MES is presented comprehensively. The DHN model comprises dispatch constraints (DCs) and linear system of temperature correction equations (TCEs). The DCs form part of the OCDM constraints, where the mass flow temperatures are treated as constants and the mass flow rates and heat power are decision variables. The TCEs are employed to update the mass flow temperatures in DCs. Subsequently, an iterative solving strategy for the OCDM is proposed. The convergence of the solving strategy is analyzed and an effective method is introduced to ensure the convergence. A modified system based on an actual MES in Changchun, China is researched in the case study. Three cases are given to verify the effectiveness of the dispatch strategy and the solution method as well as study the influence of wind power penetration and heating level to the results.
- Published
- 2018
8. Three-Phase Imbalance Management and Economic Operation for Distribution Area with Natural Ester Insulating Transformers
- Author
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Zhou Jinhui, Lijun Zhou, Qicheng Zhao, Xianjun Shao, Zhang Chi, and Cheng Xie
- Subjects
Imagination ,Chemical substance ,Computer science ,media_common.quotation_subject ,Distribution transformer ,Automotive engineering ,law.invention ,Three-phase ,law ,Electrical equipment ,Commutation ,Transformer ,Low voltage ,media_common - Abstract
With the expanding application of natural ester insulating transformers in distribution area, the economic operation of distribution network becomes more and more important in order to reduce the overall cost in a distribution transformer’s life cycle. The imbalanced three-phase load increases the loss of transformers, and results in low voltage problem in the heavy load phase or even damages to customer’s electrical equipment. In this paper, a multi-objective optimal commutation mathematical model is established and verified to optimize the performance of the three-phase load imbalance regulation based on commutation switches. Compared with the common devices such as reactive compensation and SVG, the real-time online commutation switch system with an automatic commutation control strategy based on proposed vector genetic algorithm displays a better performance in reducing the power loss of distribution area as well as in solving the low voltage problem of users. We expect it to be a competitive solution for the economic and efficient operation of the distribution power grid.
- Published
- 2019
9. Residential CCHP microgrid with load aggregator: Operation mode, pricing strategy, and optimal dispatch
- Author
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Jun Wang, Xuesong Zhang, Bo Zhao, Zhou Jinhui, Wu Zhi, Wei Gu, and Shuai Lu
- Subjects
020209 energy ,Mechanical Engineering ,Environmental pollution ,02 engineering and technology ,Building and Construction ,Management, Monitoring, Policy and Law ,computer.software_genre ,Automotive engineering ,Power (physics) ,News aggregator ,Demand response ,General Energy ,020401 chemical engineering ,Range (aeronautics) ,0202 electrical engineering, electronic engineering, information engineering ,Economics ,Microgrid ,0204 chemical engineering ,computer ,Intensity (heat transfer) ,Simulation ,Energy (signal processing) - Abstract
As the global energy crisis, environmental pollution, and global warming grow in intensity, increasing attention is being paid to combined cooling, heating, and power (CCHP) systems that realize high-efficiency cascade utilization of energy. This paper proposes a bilateral transaction mechanism between a residential CCHP system and a load aggregator (LA). The variable energy cost of the CCHP system is analyzed, based on which an energy pricing strategy for the CCHP system is proposed. Under this pricing strategy, the electricity price is constant, while the heat/cool price is ladder-shaped and dependent on the relationship between the electrical, heat, and cool loads. For the LA, an integrated demand response program is proposed that combines electricity-load shifting and a flexible heating/cooling supply, in which a thermodynamic model of buildings is used to determine the appropriate range of heating/cooling supply. Subsequently, a two-stage optimal dispatch model is proposed for the energy system that comprises the CCHP system and the LA. Case studies consisting of three scenarios (winter, summer, and excessive seasons) are delivered to demonstrate the effectiveness of the proposed approach, and the performance of the proposed pricing strategy is also evaluated by annual operation simulations.
- Published
- 2017
10. Preparation and Effect of Lighting on Structures and Properties of GSH Capped ZnSe QDs
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Gary J. Cheng, Zeze Peng, Ling Ding, Yuhe Liang, Peijiang Zhou, Zhou Jinhui, Qiong Nian, and Dong Lin
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Aqueous solution ,Sociology and Political Science ,business.industry ,Chemistry ,Clinical Biochemistry ,Photochemistry ,Biochemistry ,Clinical Psychology ,Chemical bond ,Quantum dot ,Dispersion (optics) ,Photocatalysis ,Ultraviolet light ,Optoelectronics ,Irradiation ,Particle size ,business ,Law ,Spectroscopy ,Social Sciences (miscellaneous) - Abstract
L-glutathione (GSH) capped ZnSe quantum dots (QDs) were prepared by microwave-assisted aqueous synthesis. Then, the resulting QDs were illuminated under dark, ultraviolet light and incandescent light, respectively. Thereby effect of lighting on the structures and properties of QDs were studied systematically. It was revealed that particle size and element content of QDs took a sharp change after irradiation, while the crystal structure maintains nearly unaffected. Comparing to the ZnSe QDs under dark condition, counterparts irradiated by UV light possessed outstanding sphericity, size distribution and dispersion. And the content of sulfur (S) in ZnSe QDs irradiated by UV light was much higher relatively. The effect of lighting on vibration peaks of O-H was considerable. However, this effect was observed to be weak on other chemical bonds. The possible explanation ascribes to photo-chemical interactions can occur between S-H and O-H bonds on the surface of GSH ligand. The lighting induced GSH to occur photocatalytic oxidation on the surface of ZnSe QDs, which improved the optical properties of QDs. The effects of lighting rely on irradiation types, the sequence is UV light, incandescent light and dark from high to low.
- Published
- 2015
11. Feasibility Analysis and Protection Measures of Live Working on the multi-circuit Transmission Lines on the Same Tower
- Author
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Wang Ziling, Zhou Jinhui, Wen Binbin, Ge Leijiao, Chen Chao, and Ma Zhenyu
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History ,Electric power transmission ,Operation mode ,Computer science ,Power grid ,Tower ,Reliability (statistics) ,Automotive engineering ,Line (electrical engineering) ,Computer Science Applications ,Education ,Power (physics) - Abstract
Live line operation is the most direct and effective means for the maintenance of multi-circuit transmission lines on the same tower. It is also a special operation mode developed to improve the reliability of power supply and the safety of power grid. Therefore, it is necessary to analyze the feasibility of live line operation of multi-circuit transmission lines on the same tower. In this paper, 110 kV, 220 kV and 500 kV multi-circuit transmission lines on the same tower are taken as object, and the safety analysis of live working is carried out for typical working positions. According to the results of operation impact discharge test, the risk rate and safe working distance of live working are obtained; Finally, the minimum effective insulation length of load-bearing tools and operation tools is calculated.
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- 2020
12. Modified Minimum Approach Distance Formula for Five Working Used for 500kV Insulated Aerial Vehicles with Double Circuits on the Same Tower
- Author
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Zhou Jinhui, Xu Yipin, Ma Zhenyu, Chen Chao, Wen Binbin, and Ge Leijiao
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Physics ,History ,business.industry ,Structural engineering ,business ,Tower ,Computer Science Applications ,Education ,Electronic circuit - Abstract
500kV double circuits on the same tower can effectively improve the natural transmission power and reduce the width of the line corridor, but the electromagnetic environment under the conductor is deteriorated. In order to ensure the safety of the workers in the insulated aerial vehicles and equipment during the live working, this paper firstly calculates the electric field distribution on the operating surface of the 500kV double-circuits truck with the actual line parameters, and then defines the distance coefficient. The existing minimum safe distance formula is modified, and a reference calculation method of the distance coefficient is given in combination with the data in the paper. Finally, the simulation data is used to verify.
- Published
- 2020
13. Characterization of Chinese Unifloral Honeys Based on Proline and Phenolic Content as Markers of Botanical Origin, Using Multivariate Analysis
- Author
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Wen Yaqin, Jin Yue, Zhou Jinhui, Chen Lanzhen, Li Yi, Zhao Wen, and Jinzhen Zhang
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China ,Rapeseed ,animal structures ,Proline ,Pharmaceutical Science ,Flowers ,phenolic compounds ,Biology ,Article ,Analytical Chemistry ,Rutin ,chemistry.chemical_compound ,0404 agricultural biotechnology ,Phenols ,Tandem Mass Spectrometry ,Drug Discovery ,Botany ,Food science ,Physical and Theoretical Chemistry ,Codonopsis ,Chromatography, High Pressure Liquid ,Benzoic acid ,Principal Component Analysis ,botanical origin ,Organic Chemistry ,digestive, oral, and skin physiology ,fungi ,Brassica rapa ,Solid Phase Extraction ,food and beverages ,04 agricultural and veterinary sciences ,proline ,chemometrics ,unifloral honeys ,Honey ,biology.organism_classification ,040401 food science ,Sunflower ,Honey samples ,chemistry ,Chemistry (miscellaneous) ,Multivariate Analysis ,behavior and behavior mechanisms ,Molecular Medicine ,Helianthus ,Kaempferol ,Fagopyrum - Abstract
The phenolic and proline content were determined in honey samples of different floral origins (rapeseed, sunflower, buckwheat and Codonopsis) from five different regions of China. The phenolic and proline profile of these samples were used to construct a statistical model to distinguish honeys from different floral origins. Significant differences were identified among the studied honey samples from multivariate chemometric methods. The proline content varied among the four types of honeys, with the values decreasing in the order: buckwheat > Codonopsis > sunflower > rapeseed. Rapeseed honeys contained a high level of benzoic acid, while rutin, p-coumaric acid, p-hydroxybenzoic acid were present at relatively high levels in buckwheat honeys. Principal component analysis (PCA) revealed that rapeseed honey could be distinguished from the other three unifloral honeys, and benzoic acid, proline and kaempferol could serve as potential floral markers. Using 18 phenolic compounds and proline the honey samples were satisfactorily classified according to floral origin at 94% correct prediction by linear discriminant analysis (LDA). The results indicated that phenolic compounds and proline were useful for the identification of the floral origin of the four type honeys.
- Published
- 2017
14. Mid-Infrared Spectroscopy Analysis Combined with Support Vector Machine for Rapid Discrimination of Botanical Origin of Honey
- Author
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李熠 Li Yi, 陈兰珍 Chen Lanzhen, 徐天扬 Xu Tianyang, 杨娟 Yang Juan, 周金慧 Zhou Jinhui, 刘翠玲 Liu Cuiling, and 孙晓荣 Sun Xiaorong
- Subjects
Support vector machine ,Materials science ,Electrical and Electronic Engineering ,Mid infrared spectroscopy ,Atomic and Molecular Physics, and Optics ,Remote sensing - Published
- 2018
15. Fast determination of 26 amino acids and their content changes in royal jelly during storage using ultra-performance liquid chromatography
- Author
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Zhao Jing, Wu Liming, Li Yi, Zhou Jinhui, and Xue Xiaofeng
- Subjects
chemistry.chemical_classification ,Chromatography ,food.ingredient ,Significant difference ,Food preservation ,Food storage ,Food composition data ,Free amino ,High-performance liquid chromatography ,Amino acid ,food ,chemistry ,Royal jelly ,Food Science - Abstract
A rapid ultra-performance liquid chromatography (UPLC) method was developed for feasible separation and quantification of 26 amino acids in royal jelly. The analysis was performed on Acquity UPLC system with Acquity UPLC AccQ·Tag Ultra Column within 8 min. The correlation coefficient values ( r 2 > 0.9978) indicated good correlations between the investigated compounds’ concentrations and their peak areas within the test ranges. The limits of quantitation and detection of 26 amino acids were 42.7–235.1 ng/mL and 12.9–69.3 ng/mL, respectively. The recoveries ranged from 90.1% to 100.9% and the overall relative standard deviations for intra- and inter-day were lower than 2.8%. The results showed that UPLC was a powerful tool for the analysis of amino acids in royal jelly. The method was also applied to quantitatively determine free amino acid (FAA) and total amino acid (TAA) profiles in RJ samples stored at different temperatures (−18 °C, 4 °C and 25 °C) for different time intervals (1, 3, 6 and 10 months). Results showed that the average contents of FAA and TAA in fresh royal jelly were 9.21 mg/g and 111.27 mg/g, respectively; the major FAAs were Pro, Gln, Lys, Glu, and the most abundant TAAs were Asp, Glu, Lys and Leu. Although the concentration of most FAAs and TAAs showed no significant difference during storage, contents of total Met and free Gln decreased significantly and continuously, and might be a parameter to predict the quality of royal jelly.
- Published
- 2009
16. Review of Software Architecture Analysis and Evaluation Methods
- Author
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Wang Qing, Liu Xia, Li Mingshu, and Zhou Jinhui
- Subjects
Enterprise architecture framework ,Resource-oriented architecture ,Computer Networks and Communications ,business.industry ,Computer science ,Architecture tradeoff analysis method ,Computer architecture ,Hardware and Architecture ,Reference architecture ,Software verification and validation ,Software engineering ,business ,Software architecture ,Software ,Software architecture description - Published
- 2005
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