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神经酸是一种能够疏通、修复受损神经纤维和促进神经细胞再生的单不饱和脂肪酸，可用于预防及治疗脑萎缩、阿尔茨海默病等脑疾病，具有较高的药用价值。旨在为高纯度神经酸产品的生产和发展提供参考，综述了神经酸的功效和来源，详细阐述了植物来源神经酸的分离方法，包括其原理和特点。不同分离方法的耦合可克服单一分离方法的某些缺点，且一定程度上解决对神经酸纯度、产量双重提高的难题，成为重要的研究方向。Nervonic acid is a monounsaturated fatty acid that can unblock and repair damaged nerve fibers and promote nerve cell regeneration, so it can be used to prevent and treat brain diseases such as brain atrophy and Alzheimer′s disease, and has high medicinal value. In order to provide reference for the production and development of high-purity nervonic acid products, the efficacy and sources of nervonic acid were reviewed, and the separation methods of nervonic acid, including their principles and characteristics were described. The coupling of different methods can overcome some disadvantages of single separation method, solve the problem of improving the purity and yield of nervonic acid to a certain extent, which has become an important research direction for the separation of nervonic acid.

Copyright of Acta Agriculturae Zhejiangensis is the property of Acta Agriculturae Zhejiangensis Editorial Office and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)

Copyright of Chinese Journal of Applied Ecology / Yingyong Shengtai Xuebao is the property of Chinese Journal of Applied Ecology and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)

Copyright of Journal of Henan Agricultural Sciences is the property of Editorial Board of Journal of Henan Agricultural Sciences and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)

Copyright of Science & Technology of Cereals, Oils & Foods is the property of Science & Technology of Cereals, Oils & Foods Editorial Office and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)

Copyright of Acta Prataculturae Sinica is the property of Acta Prataculturae Sinica Editorial Office and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)

Copyright of Journal of Nanjing Medical University: Natural Sciences is the property of Journal of Nanjing Medicial University (NMU) Medical Publications Center and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)

Copyright of Journal of Engineering Management / Gongcheng Guanli Xuebao is the property of Journal of Engineering Management Editorial Office and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)

Copyright of Aero Weaponry is the property of Aero Weaponry Editorial Office and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)

Copyright of Xinjiang Agricultural Sciences is the property of Xinjiang Agricultural Sciences Editorial Department and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)

Copyright of Chemistry & Industry of Forest Products is the property of Chemistry & Industry of Forest Products Editorial Department and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)

The optimal allocation of various airport ground resources is the core problem of airport ground operation optimization, and the scheduling of airport ground support tasks is a key part of it. A two-stage airport ground support resource scheduling model was constructed and a two-stage heuristic algorithm was designed for solving the scheduling problem of airport ground support vehicles, considering flight delays and advancement. Based on the actual operation data of a large airport in China, simulation experiments were conducted for the scheduling of clear water vehicles and food vehicles respectively. Results show that: compared with the FCFS strategy, the total driving distance of the clear water vehicle is reduced by 55.31%, and the total driving distance of the food truck is reduced by 47.38%. Compared with the traditional genetic algorithm, the total distance traveled of the clear water vehicle is reduced by 19. 31% and the total distance traveled of the food vehicle is reduced by 22. 93% . After dynamic adjustment, the total driving distance of water trucks increased by 1.2%, and the total driving distance of food trucks increased by 3.2%, both within the acceptable range. It can be seen that the two-stage airport ground support resource scheduling model can improve the field operation efficiency of large airports and provide theoretical basis and decision support for the actual ground support task scheduling of airport flights. [ABSTRACT FROM AUTHOR]

There was a tax policy for lacquer forest at a higher rate (only the taxation of the lacquer forest is 25%) in the Rites of Zhou, which had not been found to be implemented during the pre-Qin and Han dynasties. Scholars have developed two explanations for this extraordinary taxation policy: one is to “restrain the end”, and the other is to "return to the nature", but neither fits well in the text of the Rites of Zhou. Based on the cash crop tax policy in ancient China and the historical background mentioned in the Rites of Zhou and the tea tax in the Tang Dynasty, this paper gives an explanation for the taxation of the lacquer forest. [ABSTRACT FROM AUTHOR]

Copyright of Acta Agriculturae Zhejiangensis is the property of Acta Agriculturae Zhejiangensis Editorial Office and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)

[Objective]To understand the community structure and soil environment status of the mountain top dwarf forest in Yangming Mountain, Hunan. [Method]A field investigation was conducted on the mountaintop dwarf forest in Yangming Mountain, Hunan Province, and the soil of the habitat was measured. [Result]The results showed that a total of 37 families, 51 genera, and 68 species of plants were recorded in the low forest sample plot on the mountaintop of Yangming Mountain. Among them, Rhododendron are the dominant genera in the tree layer and shrub layer. Rhododendron fortunei occupies an absolute dominant position in the number, height and importance value, and showing singledominant community structure. The important values of tree layer, shrub layer and herb layer were significantly correlated with OM and TN(P< 0. 05). [Conclusion]The mountaintop dwarf forest in Yangming Mountain, Hunan Province is a special community variant formed by the longterm development of subtropical evergreen broad-leaved forest in a special mountaintop habitat, with structural characteristics of single superior species communities; Among them, soil factors are of great significance for the development of subtropical mountaintop vegetation. [ABSTRACT FROM AUTHOR]

Copyright of Chinese Journal of Applied Ecology / Yingyong Shengtai Xuebao is the property of Chinese Journal of Applied Ecology and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)

Objective To investigate the characteristics and significance of atrial low voltage areas( LVAs) measured by electroanatomical mapping among patients with atrial fibrillation(AF) in different rhythms, and to analyze the effect of pure pulmonary vein isolation (PVI) on LVAs. Methods Eighty-four AF patients (49 with paroxysmal AF and 35 with persistent AF) who had undergone radiofrequency ablation for the first time were consecutively enrolled and matched using propensity scoring. The areas of LVAs in each region after the atrial quintile were measured and analyzed at a threshold of 0. 5 mV. Results Thirty-one groups of patients are matched by using propensity scoring according to age, sex and BMI. The mean numbers of mapping points before and after the ablation are separately 1 434. 2±393. 6 and 1 281. 3±372. 7 in patients with paroxysmal AF while the numbers are 1 652. 6±728. 2 and 1 314. 6±690. 8 respectively in patients with persistent AF. LVAs could be recorded in all research subjects. There is no significant difference in LVAs preoperatively and postoperatively in patients with paroxysmal AF; the area of LVAs is significantly decreased postoperatively in patients with persistent AF (P<0. 05). Among all the 84 AF patients, the proportions of LVAs presented in the anterior wall, septem, inferior wall, lateral wall, and posterior wall are 69. 0%, 95. 2%, 82. 1%, 60. 7% and 52. 4%, respectively. Conclusion At the same voltage threshold, the area of LVAs in patients with persistent AF is significantly larger in AF rhythm than that in sinus rhythm, and pure PVI has little effect on LVAs. LVAs are prevalent in the anterior wall, septem and inferior wall in AF patients. [ABSTRACT FROM AUTHOR]

Copyright of Journal of Technology Economics is the property of Chinese Society of Technology Economics and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)

Copyright of Acta Agriculturae Zhejiangensis is the property of Acta Agriculturae Zhejiangensis Editorial Office and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)

AIM: To investigate the effect and possible mechanism of sakuranetin(SK)on 2,4,6-trinitroben-zenesulfonic acid (TNBS) -induced Crohn disease (CD) -like colitis in mice. METHODS: A total of 24 C57BL/6J mice were randomly divided into a control, model (TNBS), and SK (20 mg-kg'-d"1) treatment groups(TNBS+SK), with eight mice in each group. Colitis symptoms were evaluated using the disease activity index(DA1) and body weight change. The colon injury was evaluated based on colon length, histological inflammation score, and levels of intestinal mucosal inflammatory mediators(TNF-ot, IL-6, 1L-17A, and IL-1 p). The intestinal barrier function was assessed by measuring the levels of fluorescein isothiocyanate-dextran 4 kD(FD4)and intestinal fatty acid binding protein (1-FABP)in the peripheral blood, colonic transcpitliclial electric resistance (TEER), and intestinal bacterial translocation rate. (tCiic Ontology ((;O)and Kyoto Encyclopedia of Genes and Genomes(KEG(;) cnrichmciit analyses were performed to predict the potential pathways and SK mechanisms, followed by validation through animal experiments. RESULTS: The DAI score and body weight loss in the l -BS+SK group were significantly lower than those in the group hut higher than those in the control group (P<0. 05). The TMJS+SK group showed a significant reduction in colonic shortening, histological iiiflammatory scores, and levels of colonic mucosal inflammatoiy mediators compared to the TABS group, hut higher than those in the control group (P<0. 05). The levels of FD4 and 1-1ABP in the peripheral blood of the TMiS+SK group were significantly lower than those of the TJSBS group, hut higher than those of the control group(P

It is difficult for robots to work in rough terrain, so a quadruped hydraulic robot is designed. The design of the four-legged hydraulic robot is based on the deformation of the four-legged and wheeled robot, enabling the robot to adapt to more complex terrain, including up/down steep slopes, up steps and over gullies. Firstly, the algorithm of robot motion stability determination is investigated, and the SSM stability determination method is more suitable for analyzing the obstacle crossing motion process of quadruped hydraulic robot. Secondly, based on SSM principle, the gaits for obstacle crossing are designed. Finally, the movement simulation was completed under gazebo physics engine based on ROS system. Through the calculation of the SSM margin value and the physical simulation experiment, the robot can safely and stably cross the obstacle, which proves the effectiveness of the motion design during the obstacle crossing process. [ABSTRACT FROM AUTHOR]

Copyright of Inorganic Chemicals Industry is the property of Editorial Office of Inorganic Chemicals Industry and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)

In order to clarify the resistance status and resistance mechanism of the field population of the small brown planthopper (SBPH), Laodelphax striatellus, to commonly used insecticides, we monitored the resistance level of SBPH collected from Yizheng and Yancheng in Jiangsu Province, Changxing in Zhejiang Province and Lujiang in Anhui Province, to eight insecticides during 2021 to 2022 using rice seedling dipping method. The synergistic effects of three detoxification enzyme inhibitors, piperonyl butoxide (PBO), diethylmaleate (DEM), and triphenyl phosphate (TPP), to buprofezin on the control of SBPH were measured. The results showed that four regions populations of SBPH have developed medium to high level resistance to buprofezin (RR = 61.5-148.8), and moderate level resistance to chlorpyrifos (RR = 14.9-28.3). Furthermore, the four regions SBPH populations exhibited sensitive or low-level resistance to nitenpyram (RR = 0.7-9.9), thiamethoxam (RR = 1.6-8.3), dinotefuran (RR = 2.9-10.0) and sulfoxaflor (RR = 2.5-8.7). In addition, all field populations of SBPH were susceptible to pymetrozine (RR = 1.0-5.0) and triflumezopyrim (RR = 0.5-2.3). PBO, TPP, and DEM displayed no synergism effect on the sensitivity of SBPH to buprofezin, which indicated that these three detoxifying enzymes might play little role in the buprofezin resistance. The results of this study provided a scientific basis for the resistance management and field control of SBPH. [ABSTRACT FROM AUTHOR]

Copyright of Acta Agronomica Sinica is the property of Crop Science Society of China and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)

对钱塘江中沉积物粒度的研究，前人多关注横剖面的粒度变化.为了解钱塘江沉积物粒度在流向上的变化特征，在下沙段（下沙大桥至江东大桥）进行粒度采样，对含泥砂悬浮物样品和砂泥样品的粒度进行分析.结果表明，粒度在1.45〜3 500 µm，属粘土至砾组分，以粉砂组分占比最多；粒径均值为3.24〜5.92 µm，位于粉砂至极细砂范围；粒度频率呈多峰分布，分选差至分选非常差，峰度为非常尖峰至宽峰.在该区间的直流河段粒度特征相似，而在下沙大桥河流弯曲的凸岸处粒度特征不同.反映该处水动力条件复杂，可能同时受到层流和紊流的影响.最大水流分量在下沙大桥凸岸处最小，在直流河段随流向逐渐减小.粒度和最大水流分量特征受钱塘江下沙段河流形态控制.

Copyright of Science Technology & Engineering is the property of Chinese Society of Technology Economics and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)

Objective To evaluate structure and function of carotid artery in patients with high-normal blood pressure by quality arterial stiffness (QAS) combined with quality intima media thickness (QIMT). Methods According to blood pressure levels, patients who underwent carotid ultrasound and QAS combined with QIMT were divided into the normal blood pressure group (n=82), the normal high-value blood pressure group (n=90) and the hypertension group (n=68). The elastic parameters of bilateral carotid artery were measured by QAS technique, including dilation coefficient (DC), compliance coefficient (CC), stiffness coefficient (α, β) and pulse wave conduction velocity (PWV). The internal media thickness (IMT) of bilateral carotid arteries was measured by QIMT technique. Body mass index (BMI), total cholesterol (TC), triglyceride (TG), high density lipoprotein cholesterol (HDL-C) and low density lipoprotein cholesterol (LDL-C) were collected. Carotid artery elastic parameters and IMT were compared between different gender groups. The left and right carotid artery elastic parameters in patients with normal high blood pressure and the carotid artery elastic parameters and IMT with different blood pressure levels were also compared in different groups. The correlation between blood lipid and each parameter was analyzed. Results The IMT of carotid artery was higher in men with normal high blood pressure than that in women (P＜0.05). There were no significant differences in IMT, DC, CC, α, β and PWV between left and right carotid arteries. Compared with the normal blood pressure group, the IMT, α, β and PWV were increased in the normal high blood pressure group and the hypertension group, while DC and CC were decreased (P＜0.05). HDL-C was positively correlated with DC and CC, but negatively correlated with α, β and PWV in the normal high-value blood pressure patients (P＜0.01). LDL-C was negatively correlated with DC and CC, but positively correlated with α, β and PWV in the normal high-value blood pressure group (P＜0.01). Conclusion QAS combined with QIMT shows that carotid artery elasticity is decreased and IMT is thickened in patients with high normal blood pressure. [ABSTRACT FROM AUTHOR]

Objective　To investigate the effect of 7‑ketocholesterol (7‑KC) on apoptosis and to elucidate its underlying mechanism in pancreatic β‑cells. Methods　INS‑1 cells were treated with 0, 0.25, 2.5 and 25 μmol/L 7‑KC for 24 h, and the concentration inducing apoptosis of INS‑1 cells was detected by western blotting. Furthermore, the cells were divided into four groups: blank group, 25 μmol/L 7‑KC treatment group, 7‑KC treatment and pretreated with 1 mmol/L endoplasmic reticulum (ER) stress inhibitor 4‑phenylbutyric acid (4‑PBA) group, and 1 mmol/L 4‑PBA group. The expression of ER stress marker proteins [inosital‑requiring enzyme‑1α (IRE‑1α), protein kinase R‑like endoplasmic reticulum kinase (PERK), activating transcription factor 4 (ATF4), phosphorylated α subunit of eukaryotic initiation factor 2 (p‑eIF‑2α), α subunit of eukaryotic initiation factor 2 (eIF‑2α), C/Ebp‑homologous protein (CHOP), phosphorylated inosital‑requiring enzyme‑1 (p‑IRE‑1α), phosphorylated protein kinase R‑like endoplasmic reticulum kinase (p‑PERK), activating transcription factor 6α (ATF‑6α)], apoptosis proteins [B‑cell lymphoma‑2 (Bcl‑2), Bcl2‑associated X (Bax), cleaved cysteinyl aspartate‑specific proteinase‑3 (cleaved‑Caspase 3)], ER morphology and interaction proteins of ER [glucose regulated protein 78 (GRP78)] were elucidated via western blotting, flow cytometry and immunofluorescence, transmission electron microscopy and co‑immunoprecipitation, in order to verify the role of ER stress in β‑cell function impairment by 7‑KC. Two‑tailed Student′s t tests were performed to compare means between two groups. ANOVA followed by Bonferroni′s multiple comparisons was used to compare means from three or more groups. Results　The cleaved‑Caspase3 was increased dose‑dependently and upregulated obviously at 25 μmol/L 7‑KC treatment group (P<0.01). Meanwhile, the dilation and vesiculation of ER, and ER stress‑sensing proteins p‑PERK, p‑IRE‑1α, ATF6, p‑eIF‑1, ATF4, and CHOP were dramatically upregulated at 25 μmol/L 7‑KC treatment group. Compared with 25 μmol/L 7‑KC treatment group, the further study showed that ER stress protein expressions were downregulated, and apoptosis proteins expressions were decreased at 25 μmol/L 7‑KC treatment and pretreated with 1 mmo/L 4‑PBA group (P<0.05). Co‑immunoprecipitation demonstrated that the binding of molecular chaperones GRP78 and PERK was inhibited at 25 μmol/L 7‑KC treatment group, and furthermore increased PERK autophosphorylation and then activated ER stress. Conclusion　7‑KC activates ER stress and promotes apoptosis by inhibiting the GRP78‑PERK interaction in pancreatic β cells. [ABSTRACT FROM AUTHOR]

Copyright of Inorganic Chemicals Industry is the property of Editorial Office of Inorganic Chemicals Industry and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)

Copyright of Acta Agriculturae Zhejiangensis is the property of Acta Agriculturae Zhejiangensis Editorial Office and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)

China is the first country in the world to invent silkworms and silk has a long cultural history not only providing us with excellent clothing but also making an important contribution to the exchange between China and the world in various aspects. Silk is a valuable heritage rich in vitality. Raw silk is the primary product of the silk industry and its quality is related to the stability and development of the silk industry. The cocoons need to be mixed peeled selected reeled and reshuffled in order to be reeled into raw silk. Reeling is a very important part of the silk production process and it is the process of dissociating and gathering the cocoon silk from the surface of the cooked cocoons into raw silk mainly including the process of cocoon brushing picking end end attaching uniting ends and sheath twisting. The twisting sheath is a process of forming a silk sheath by manually twisting the silk strip and its rear silk strip in a spiral twisting state. During silk reeling the two strips of the filament rotate at a high speed under the action of the filament sheath and the moisture on the filament is divergent. At the same time the ends of the silk sheath are subjected to tension and the sides of the silk strip are subjected to the squeezing pressure of the silk strip itself. This squeezing pressure on the sides of the silk strip results in a tighter structure of the silk strip which improves the distribution uniformity of sericin increases the adhesive area and enhances the cohesion of the silk strip. In addition the squeezing of the silk sheaths causes the silk strips to rub against each other reducing the number of flawed strips and improving their clarity. At present most of the processes in the silk reeling factory have been mechanized but the silk sheath is the only operation that needs to be completed manually in the existing automatic silk reeling machine. The proficiency of the operator affects the structural parameters of the silk sheath which makes the uniformity of the silk sheath poor thus affecting the silk agglomeration effect. The manual operation restricts the improvement of silk reeling labor productivity while affecting the automation degree of automatic silk reeling machines. In response to the problems of uneven quality and low efficiency of the traditional manual sheath twisting method we are eager to make a new breakthrough in improving the efficiency and the uniformity of the quality of the silk sheath. Therefore the idea of an automatic bave gathering device is proposed as an alternative to manual sheath twisting. The automatic bave gathering device includes three parts gathering friction mechanism gathering guide mechanism and transmission mechanism which can be directly installed on the silk reeling machine. By designing an orthogonal experimental scheme the effects of different center distances and rotation speeds of the guide ring on the moisture recovery rate of silk sheet surface morphology longitudinal round shape mechanical properties and cohesion properties of the raw silk were analyzed and the optimum process parameters were determined. The performance of the raw silk reeled under the optimum process parameters was compared with that of the raw silk reeled under the conventional process. The results showed that when the reeling speed was 104 m / min the center distance of the guide ring was 7. 0 mm and the rotation speed of the guide ring was 250 r / min the performance indexes of the reeled raw silk were the best. There was no significant difference in the elongation at break and moisture recovery rate of the silk sheet under the optimum process parameters compared with the conventional process and there was an improvement in the surface morphology the longitudinal round shape the breaking strength and the cohesion properties of the raw silk. The use of the automatic bave gathering device to reel raw silk can improve the performance of raw silk to achieve the purpose of replacing the manual silk sheath to gather cocoon silk and improve efficiency and to meet the requirements of raw silk production which provides a technical reference for further automation of automatic silk reeling machines and improve production efficiency. [ABSTRACT FROM AUTHOR]

Copyright of China Medical Education Technology is the property of China Medical Education Technology Editorial Office and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)

Copyright of Acta Agriculturae Zhejiangensis is the property of Acta Agriculturae Zhejiangensis Editorial Office and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)

Due to the instability of generation power of distributed generation in microgrid, when microgrid and large power grid operate in parallel, it will affect the stability of large power grid system. In order to eliminate the influence of power fluctuation in microgrid on large power grid, it is necessary to improve the grid connection interface. A flexible grid connection interface is proposed to stabilize the power fluctuation in microgrid and connect the distribution network and microgrid flexibly. The interface takes the back-to-back converter as the prototype, and applies the hybrid energy storage technology to the grid connection technology to calculate the power fluctuations in the microgrid. Then, the hybrid energy storage link in the grid-connected interface is used to smooth out the power fluctuations, which eliminates the impact of microgrid power fluctuations on the distribution network power and simplifies the control mode of the micro source in the microgrid. Experiments performed on MATLAB/Simulink simulation platform prove that the flexible grid-connected interface can suppress the power fluctuations of the microgrid, and the grid-connected interface can effectively simplify the control mode in the microgrid when the microgrid operating mode is switched. [ABSTRACT FROM AUTHOR]

Copyright of Applied Chemical Industry is the property of Shaanxi Research Design Insitute of Petroleum & Chemical Industry and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)

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Objective To explore the mechanism of hepatitis B virus X protein down-regulating DKK4 and its effect on the proliferation, migration of HCC cell lines. Methods HCC cell lines HepG2 and SMMC7721 cells were infected with adenovirus encoding hepatitis B virus X protein (Ad-HBx), and GFP adenovirus (Ad-GFP) was designed as a control group. We used deacetylase inhibitor (TSA) to treat HCC cell lines and transfected HCC cell lines with small interfering RNA-histone deacetylase 1 (si-HDAC1) and lentivirus overexpressing DKK4. Western blot was used to detect the expression of DKK4, HDAC1 and SIRT1. The proliferation and migration ability of HCC lines were assessed using MTT, crystal violet experiment and Transwell experiment. Results DKK4 expression level was significantly downregulated after Ad- HBx infection (P<0.05), and its expression level was recovered after TSA treatment (P<0.05). After silencing HDAC1 with small interfering RNA, the expression of DKK4 could be restored (P<0.05), the proliferation and migration of HDAC1-silencing or/and DKK4-overexpressing cells decreased (P<0.05). Conclusion Hepatitis B virus X protein inhibits the expression of DKK4 protein by up-regulating HDAC1 and SIRT1. Silencing HDAC1 and over expressing DKK4 protein could inhibit the proliferation and migration of HCC cell lines infected with Ad-HBx. [ABSTRACT FROM AUTHOR]

Scholars have widely discussed the topic of regional spatial structure. However, most of the literatures are produced to understand this filed from a single scale perspective, with little attention to multi-scale perspectives and the relationship between different scale areas. In addition, the current empirical results are mostly concentrated in the eastern coastal areas of China, and few studies examine the underdeveloped southwest regions. This study goes beyond the method of taking prefecture-level cities as measurement units and investigates the relationship between different scales in the field of urban networks. Based on mobile signaling data, this study conducts an empirical examination of the spatial network structure of Guangxi, where urban districts and counties are taken as basic measurement units, and the connection degree and centrality models are employed for quantitative analysis. The following results were derived: In terms of horizontal linkage, the relationship between four sub-regions shows that southern Guangxi has the highest centrality, followed by western Guangxi and northern Guangxi, eastern Guangxi has the lowest centrality. The connection degree of four sub-regions indicates that southern Guangxi has the strongest connection with western Guangxi, as well as strong connections with eastern and northern Guangxi. Northern Guangxi has weak connections with eastern and western Guangxi, while eastern Guangxi has the weakest connection with western Guangxi. The relationship between inter-prefecture-level cities shows that Nanning has the highest centrality, followed by Laibin. The connection among prefecture-level cities is centered on Nanning, and there are two main connection axes: Nanning-Hechi and Nanning-Laibin. The relationship between inter-urban districts shows that Guilin has the highest centrality, followed by Liuzhou and Yulin. Hechi has the lowest centrality, and there are five prominent connections: Fangchenggang-Qinzhou, Guigang-Laibin, Qinzhou-Nanning, Laibin-Liuzhou, and Chongzuo-Nanning. The inter-county relationship shows that the relation intensity is relatively lower; Guiping has the strongest connection with Pingnan, followed by Lingshan-Pubei. Strong connections are mainly located in the Beibu Gulf urban agglomeration, the Xijiang Economic Belt, along National Highway 324, and around the Lijiang River Scenic Area in Guilin. In terms of vertical linkage, the inter-city relationships within four subregions show that the internal connection of northern Guangxi is the strongest, followed by eastern and southern Guangxi, and that of western Guangxi is the weakest among four sub-regions, which can be used as the basis of economic zone division. The relationship between urban districts and counties shows that administrative jurisdiction has an important influence on the connections between these. The relationship intensity conforms to the law of distance attenuation, but some connections are beyond the scope of administrative jurisdiction. The hinterland of each urban district can be divided into three patterns: cross-, weak, and suitable boundaries. Nanning and Liuzhou are cross-boundary patterns, Hechi is a weak boundary pattern, and the rest are suitable boundary patterns. Comparing this with the current administrative regions, there are obvious differences; Nanning and Liuzhou have a wider scope of influence than their administrative regions, and Hechi has a smaller scope, which provides a basis for further adjustment of the administrative divisions. [ABSTRACT FROM AUTHOR]