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2-花生四烯酸单甘酯（2-AG）是一种内源性大麻素，在神经、心血管和免疫等系统中具有一系列的生理活性。为实现2-AG的绿色高效制备，探究了脂肪酶催化醇解富含花生四烯酸的微生物油制备2-AG的方法。以2-单甘酯（2-MAG）含量为指标，通过单因素实验对酶法催化醇解反应条件进行了优化，并采用溶剂萃取法对产物进行纯化。结果表明：最佳反应条件为以Lipozyme 435脂肪酶为醇解脂肪酶、酶添加量4%（以油质量计）、油与无水乙醇物质的量比1∶ 40、叔丁醇为溶剂、油溶比2∶ 3、反应温度35 ℃、反应时间8 h，在最佳条件下粗产物中2-MAG含量为3363%；经溶剂萃取纯化后2-MAG的纯度达到了94.79%，其中2-AG含量为40.70%。 综上，酶法醇解富含花生四烯酸的微生物油可以获得高2-AG含量的2-MAG。2-Arachidonoylglycerol (2-AG) is an endogenous cannabinoid and exhibits a variety of biological activities in the central nervous, cardiovascular, and immune systems. To prepare 2-AG in a greener and efficient way, a lipase-catalyzed alcoholysis of microbial oil rich in arachidonic acid was used to synthesize 2-AG. With the 2-monoacylglycerol (2-MAG) content as an index, the reaction conditions of lipase-catalyzed alcoholysis were optimized by single factor experiment, and a solvent extraction method was employed to purify the product. The results showed that the optimal reaction conditions of lipase-catalyzed alcoholysis were as follows: Lipozyme 435 as alcoholysis enzyme, lipase dosage 4% (relative to oil mass), molar ratio of oil to anhydrous ethanol 1∶ 40, tert-butanol as solvent, ratio of oil to solvent 2∶ 3, reaction temperature 35 ℃ and reaction time 8 h. Under the optimal conditions, 2-MAG content in the crude product was up to 33.63%. The purity of 2-MAG after purification was up to 9479%, and the content of 2-AG was 40.70%. In conclusion, enzymatic alcoholysis of microbial oil rich in arachidonic acid can obtain 2-MAG with high 2-AG content.

Copyright of Chinese Journal of Tissue Engineering Research / Zhongguo Zuzhi Gongcheng Yanjiu is the property of Chinese Journal of Tissue Engineering Research 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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Copyright of Journal of Food Safety & Quality is the property of Journal of Food Safety & Quality 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 Journal of Donghua University (Natural Science Edition) is the property of Journal of Donghua University (Natural Science) 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 Plateau Meteorology is the property of Plateau Meteorology 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 Modern Laboratory Medicine is the property of Journal of Modern Laboratory Medicine 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.)

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Copyright of Journal of Northwest A & F University - Natural Science Edition is the property of Editorial Department of Journal of Northwest A&F University (Natural Science Edition) 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.)

Hainan Province has vigorously pushed forward with the development of free trade ports, resulting in a variety of investigative approaches towards successfully transferring rural land contract management rights. These efforts are rooted in objectives such as enhancing the utilisation of available land, augmenting farmers' earnings, and fostering a thorough redevelopment of the agricultural industry in Hainan. This piece delves into the analysis of the current landscape of land transfers in Hainan Province. The study found that there are problems in the transfer of rural land contract management rights in Hainan Province, such as unclear property rights, low land transfer rate, single transfer methods, and non-standard transfer procedures. The challenges being faced are somewhat stunting the growth of Hainan's rural economy, and even the execution of strategies aimed at rural revitalization. Finally, corresponding solutions are proposed from four aspects: government services, supervision, measures, and publicity. [ABSTRACT FROM AUTHOR]

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Copyright of Acta Scientiarum Naturalium Universitatis Pekinensis is the property of Editorial Office of Acta Scientiarum Naturalium Universitatis Pekinensis 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: There is a lack of effective treatment for traumatic brain injury(TBI）, and it is needed to find new intervention targets. The asparaginyl endopeptidase(AEP) plays an important role in immune and neurological diseases, and this study observed the activation and changes of AEP in a mouse TBI model to explore the significance of AEP on brain injury and repair. Methods: Controlled cortical impact was used to create TBI damage in the right cerebral hemisphere of mice, and the lactate content and AEP activity changes in the damaged brain tissue were measured at different time points after modeling, and the activation of glial cells and the expression of AEP in TBI were observed by immunofluorescence chemical staining 3 days after TBI. Results: TBI causes lactate to accumulate in damaged brain tissue, resulting in reactive activation and proliferation of microglia and astrocytes. The upregulation and activation of AEP occur in the secondary brain injury stage of TBI, and AEP is upregulated in both microglia and astrocytes. Conclusions: AEP has the potential to play an important role in nerve injury and repair by participating in the regulation of glial cell activation triggered by TBI [ABSTRACT FROM AUTHOR]

Copyright of Industrial Water Treatment is the property of CNOOC Tianjin Chemical Research & Design Institute 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 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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Copyright of Journal of Donghua University (Natural Science Edition) is the property of Journal of Donghua University (Natural Science) 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 Materials Engineering / Cailiao Gongcheng is the property of Journal of Materials Engineering 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 Oil Drilling & Production Technology / Shiyou Zuancai Gongyi is the property of Shiyou Zuancai Gongyi Bianjibu 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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In recent years, the deep supervised hash retrieval method have been successfully applied to many image retrieval systems. However, the existing methods still have some shortcomings: First, most of the deep hash learning methods use symmetric strategies to train the network, but the training of this strategy is usually time-consuming and difficult to be used in the large-scale hash learning process; Second, there is a discrete optimization problem in the hash learning process. Existing methods relax this problem and it is difficult to guarantee the optimal solution. In order to solve the above problems, this paper proposes a greedy-asymmetric deep supervised hashing method for image retrieval, which fully combines the advantages of the greedy algorithm and asymmetric strategy to further improve the hash retrieval performance. This article compares 17 state-of-the-art methods on two commonly used datasets. Compared with the state-of-the-art methods, the propoed method increases the mAP in 48-bits setting by 1.3% on CIFAR-10 dataset. And on NUS-WIDE dataset, increases the mAP in all-bits setting by increased 2.3% on average. The experimental results show that the propoed method can further improve the performance of hash retrieval. R [ABSTRACT FROM AUTHOR]

Antarctic krill has large resources,high nutritional value,and a variety of active substances. It is a type of offshore fishery resource with great development value. Krill meal is one of the most important processed products of Antarctic krill. During the processing,due to the influence of heating and other factors,it will cause the loss of nutrients and the destruction of active substances,especially in the heat treatment links such as cooking and drying. Tends to destroy or degrade heat-sensitive components such as unsaturated fatty acids and astaxanthin. The characteristics of the main nutritional active substances of Antarctic krill such as protein, lipid,and astaxanthin and their changes in the process of krill meal processing were introduced,the influence of processing procedures and process parameters on the quality of krill meal was analyzed,the main evaluation indicators and basis of krill meal quality were summarized,The main problems in the processing of krill meal, such as unclear process,poor equipment performance and unstable product quality,were discussed,and the future research directions such as the flow path of nutrient active substances,structural change mechanism, process optimization,equipment innovation,technology,and equipment integration,etc. It is expected to provide a theoretical basis and technical reference for the optimization of the process and technology of krill meal processing. [ABSTRACT FROM AUTHOR]

Copyright of Journal of Capital Normal University (Natural Science Edition) is the property of Journal of Capital Normal University (Natural Science Edition) 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.)

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Copyright of Journal of Donghua University (Natural Science Edition) is the property of Journal of Donghua University (Natural Science) 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.)

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Copyright of Journal of Materials Engineering / Cailiao Gongcheng is the property of Journal of Materials Engineering 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 Modern Food Science & Technology is the property of Editorial Office of Modern Food Science & Technology 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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Copyright of Chinese Journal of Inorganic Analytical Chemistry / Zhongguo Wuji Fenxi Huaxue is the property of Beijing Research Institute of Mining & Metallurgy Technology Group 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 Shipin Kexue/ Food Science is the property of Food Science 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.)

Reduced graphene oxide composite fibers are supposed to be ideal electrodes for supercapacitors with high flexibility and conductivity. In this study, Hummers-method was used to prepare graphene oxide(GO). Based on a wet-spinning method, GO fibers were prepared, drawn out and then preliminary reduced by an infrared heater to form preliminary reduced graphene oxide fibers (PRGO). For the further reduction, PRGO fibers were reduced by hydrazine vapor at 90 ℃, and the structure and electrochemical properties of the prepared fibers were investigated during the different reduction time. The results indicated that the more complete morphology and better electrochemical properties were obtained during the reduction time for 2h. Moreover, further deposition of polyaniline (PANI) by in-situ growth on RGO fibers could further improve specific capacitance to 46.11F/cm³. [ABSTRACT FROM AUTHOR]

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