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随着第五次工业革命的到来与发展，生物科技、信息技术与人工智能深度融合，为发展信息化、智能化的农业提供了强有力的支持。由于农业具有社会经济属性，面向具有生物物理特性的种植系统及具有经济社会特性的管理系统，构建农业社会物理信息系统已成为共识。在系统生物学启示下，提出系统农业，即基于平行农业框架，结合农村、农民两个维度构建农业系统，以生物、信息、人工智能等技术为支撑，监测和整合多尺度、多维度、多模态信息，依据系统理论展开涵盖农业、农村、农民的系统农业研究，服务未来乡村发展。对系统农业涉及的智能技术及具体案例进行了总结与分析，并对系统农业的未来发展趋势进行了展望。

Copyright of Engineering Management & Technology Discussion is the property of Omniscient Pte. Ltd. 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 Shandong Medical Journal is the property of Shandong Medical Health Newspapers 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 distribution coefficient ( Kd) of elements in ion exchange resin is the basis of element purification and separation, which is the premise for high-precision isotope analysis. However, systematic comparison of the Kd in different types of acid is lacking, which has hindered the development of efficient separation procedures for emerging isotope system. In this research, the Kd of 60 elements in AG® 50W-X8 cationic resin with different concentrations and types of acid was studied. Our results show that, in acid solutions, the Kd of almost all elements is negatively related to acidity. Compared to nitric acid, a significant decrease in the Kd for Al, Fe, Se, Pd, Cd, and In is observed in hydrochloric acid. The addition of hydrofluoric acid can significantly reduce the Kd of Be, Al, Sc, Fe, Sn, Th, U, Ti, Zr, and Hf in dilute hydrochloric and nitric acid, so that they can be quantitively eluted from the resin. In the mixed hydrofluoric acid solutions, KdREE shows an initial increasing and then decreasing trend as the concentration of HCl increases. The present study provides data support for the development and optimization of element purification processes that are suitable for high-precision metal stable isotope analysis. [ABSTRACT FROM AUTHOR]

Copyright of Mycosystema is the property of Mycosystema Editorial Board 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 Shenyang Agricultural University is the property of Journal of Shenyang Agricultural University 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 Shenyang Agricultural University is the property of Journal of Shenyang Agricultural University 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 Shandong Medical Journal is the property of Shandong Medical Health Newspapers 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 Natural Gas Industry is the property of Natural Gas Industry Journal Agency 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 Natural Gas Industry is the property of Natural Gas Industry Journal Agency 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 Shenyang Agricultural University is the property of Journal of Shenyang Agricultural University 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.)

Objective To explore the relationship between serum serine protease inhibitor B1 (SerpinB1) and the risk of gestational diabetes mellitus (GDM). Methods A total of 328 pregnant women who were checked up in the clinic of Shengjing Hospital of China Medical University from 2016 to 2018 were divided into two groups according to GDM diagnostic criteria: normal (NC) group (n=155) and GDM group (n=173). The correlations between serum SerpinB1 level and glucose and lipid metabolism indexes were analyzed in 5-12 weeks, 13-23 weeks, 24-28 weeks and 29-37 weeks of pregnancy. The pregnant women who did not have GDM at 5-12 weeks of gestation but diagnosed GDM after 24 weeks of pregnancy were selected as GDM‑A group (n=18). The pregnant women who did not have GDM at 13-23 weeks of gestation but diagnosed GDM after 24 weeks of pregnancy were selected as GDM‑B group (n=26). Logistic regression was used to analyze the risk factors of GDM during pregnancy. Receiver operating characteristic (ROC) curve predicted the cut‑off value of serum SerpinB1 levels affecting the occurrence of GDM after 24 weeks of pregnancy. Results In the GDM group, the serum SerpinB1 level at 5-12 weeks gestation, 13-23 weeks gestation, 24-28 weeks gestation of pregnancy was significantly higher than that in the NC group (P<0.05). At 24-28 weeks of gestation, the level of serum SerpinB1 was positively correlated with LDL‑C(r=0.786, P<0.05) and negatively correlated with fasting insulin and HOMA‑IR(r=-0.724 and -0.680 respectively, P<0.05). After correcting the confounding factors such as gestational age, pre‑pregnant BMI, acanthosis nigricans and triglycerides, etc, serum SerpinB1 level at 13-23 weeks gestation was still an independent risk factor for GDM after 24 weeks of pregnancy (OR=1.573, 95%CI was 1.035 to 2.228, P<0.05). The area under the ROC curve of GDM was 0.631 (P<0.05). Conclusions Elevated serum SerpinB1 levels at 13-23 weeks of pregnancy is related to the risk of GDM occurrence after 24 weeks of pregnancy, which may be a serological marker before the occurrence of GDM. [ABSTRACT FROM AUTHOR]

Copyright of Natural Gas Industry is the property of Natural Gas Industry Journal Agency 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 Natural Gas Industry is the property of Natural Gas Industry Journal Agency 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 Natural Gas Industry is the property of Natural Gas Industry Journal Agency 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 Natural Gas Geoscience is the property of Natural Gas Geoscience 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.)

BACKGROUND: Adipose-derived stem cells have the advantages of easy access, easy separation, small trauma, and rapid proliferation. Current treatments for kidney injury are more limited, and adipose-derived stem cells may provide a new treatment route. OBJECTIVE: To investigate the effects of adipose-derived stem cell transplantation on the kidney function of rats with acute kidney injury induced by crush injury in rats. METHODS: Cryopreserved adipose-derived stem cells were recovered in vitro and cultured to prepare cell suspension following labeling with PKH-26. Twenty rats were randomly selected from 66 experimental Sprague-Dawley rats (provided by Beijing Vital River Laboratory Animal Technology Co., Ltd.) as normal control group. In the 40 of the remaining 46 rats, a pathological model of acute kidney injury caused by compression injury was successfully established by the use of forceps to double the proximal hind limbs. The 40 rat models were divided into model group and cell transplantation group, with 20 rats in each group. After 6 hours of modeling, the rats in the model group were given intravenous injection of normal saline (20 μL), and the rats in the cell group were given intravenous injection of PKH-26-labeled adipose-derived stem cells (20 μL, 3×106/L), once a day for 3 continuous days. The levels of serum creatinine and urea nitrogen were measured in each group at 1, 3, 14 and 21 days after transplantation. The left kidney of the rats in each group was observed using hematoxylin-eosin staining, TUNEL staining, RT-PCR and western blot assay at 3 and 21 days after cell transplantation. RESULTS AND CONCLUSION: (1) The levels of creatinine and urea nitrogen in the serum of rats at 1, 3, 14 and 21 days after cell transplantation were significantly higher in the model group than the normal control group (P < 0.05) and cell transplantation group (P < 0.05). (2) At 3 and 21 days after cell transplantation, the scores on the kidney injury and apoptotic rate of kidney cells were ranked as follows: model group > cell transplantation group > normal control group, and there were significant differences between groups (P < 0.05). (3) At 3 and 21 days after cell transplantation, the expressions of bax and Caspase-3 in the kidney tissue at mRNA and protein levels were significantly higher in the model group and cell transplantation than the normal control group (P < 0.01) as well as significantly higher in the cell transplantation group than the model group (P < 0.05). To conclude, adipose-derived stem cell transplantation has obvious repairing effect on acute kidney injury caused by crush injury, and its mechanism may be related to the involvement of adipose-derived stem cells in regulating the expression of bax and Caspase-3. [ABSTRACT FROM AUTHOR]

Copyright of Natural Gas Industry is the property of Natural Gas Industry Journal Agency 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.)

BACKGROUND: In recent years, many studies have shown that bone marrow mesenchymal stem cells, adipose-derived stem cells, and cardiac stem cells can participate in myocardial repair, but little is reported on the use of human urine-derived stem cells in the treatment of myocardial infarction. OBJECTIVE: To investigate the effect of human urine-derived stem cell transplantation on the heart function of myocardial infarction rats. METHODS: The 20 of 64 Sprague-Dawley rats were selected as normal control group, and the remaining 44 rats were subjected to ligation of the left anterior descending coronary artery to make myocardial infarction models. The 40 model rats were successfully made and randomized into myocardial infarction group and cell transplantation group with 20 rats in each group. The rats in the myocardial infarction group were given injection of normal saline by tail vein, while those in the cell transplantation were given injection of human urine-derived stem cells labeled by CM-Dil by tail vein. The treatment was done once a day and lasted for 3 consecutive days. At 6 weeks after cell transplantation, the heart function of rats was examined by echocardiography, and the myocardial tissues of rats in each group were taken for CD34 immunohistochemical staining, hematoxylin-eosin staining, TUNEL staining and RT-PCR detection. RESULTS AND CONCLUSION: Compared with the myocardial infarction group, significantly improved heart function of rats, increased density of neonate blood capillaries, and decreased apoptotic rate were observed in the cell transplantation group (all P < 0.05). The CM-Dil positive cells were not observed in the normal control group and myocardial infarction group, while a great number of positive cells appeared in the cell transplantation group. Compared with the myocardial infarction group, Bcl-2 gene expression level in the cell transplantation group was significantly higher (P < 0.05), while the Caspase-3 gene expression level was lowered (P < 0.05). In conclusion, transplantation of human urine-derived stem cells can significantly improve the heart function of rats with acute myocardial infarction, and reduce cell apoptosis in the rat myocardium. [ABSTRACT FROM AUTHOR]

Copyright of Natural Gas Industry is the property of Natural Gas Industry Journal Agency 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 Natural Gas Industry is the property of Natural Gas Industry Journal Agency 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 Application Research of Computers / Jisuanji Yingyong Yanjiu is the property of Application Research of Computers 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.)

Copyright of Shandong Medical Journal is the property of Shandong Medical Health Newspapers 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 Shandong Medical Journal is the property of Shandong Medical Health Newspapers 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 Shandong Medical Journal is the property of Shandong Medical Health Newspapers 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.)