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Copyright of Petroleum Geology & Oilfield Development in Daqing is the property of Editorial Department of Petroleum Geology & Oilfield Development in Daqing 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 Experimental Technology & Management is the property of Experimental Technology & 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 Experimental Technology & Management is the property of Experimental Technology & 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 Progress in Modern Biomedicine is the property of Publishing House of Progress in Modern Biomedicine 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 Experimental Technology & Management is the property of Experimental Technology & 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 Guihaia is the property of Guihaia 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 China Brewing is the property of China Brewing 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 determine the effect and mechanism of ultrasound with different intensity on uterine contraction of pregnant rats and nerve injury of fetal rats. Methods: 32 pregnant rats were randomly divided into A(0) group, B(2) group, C(4) group and D (8) group, with 8 rats in each group. Rats in these groups were respectively received ultrasonic irradiation with different intensities of 0 W cm-2, 2 W cm-2, 4 W cm-2 and 8 W cm-2 for 20 min. The uterine contraction and ATPase activities of uterine smooth muscle were recorded in pregnant rats, and neuronal apoptosis and activities of cholinergic nervous system-related enzymes in cerebral cortex and hippocampus were detected in fetal rats. Results: Ultrasound increased frequency, amplitude, tension and activity of uterine contraction (P<0.05), and decreased the activities of Na+-K+ ATPase, Ca2+ ATPase and Ca2+-Mg2+ ATPase in uterine smooth muscle of pregnant rats (P<0.05). Ultrasound reduced Bcl-2 levels (P<0.05) and increased the levels of Bax and Caspase-3 (P<0.05) in the cerebral cortex and hippocampus of fetal rats. Results: Ultrasound promoted acetylcholinesterase activity, and reduced acetylcholine and acetylcholine transferase levels (P<0.05). Ultrasounds with 4 W cm-2 and 8 W cm-2 were more effective than with 2 W cm-2 ultrasound on the effect of these indicators. Conclusions: W cm-2 and 8 W cm-2 might promote the contraction of uterine smooth muscle in pregnant rats through reducing the activity of ATPases, and resulting in damage to cerebral cortex and hippocampal neurons of fetal rats, the mechanism may be associated with the imbalance of the cholinergic neuron system. 2 W cm-2 Ultrasound has little damage to fetal rat neurons. [ABSTRACT FROM AUTHOR]

Copyright of Journal of Henan University of Technology Natural Science Edition is the property of Henan University of Technology Journal 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 uterine microbiota in women undergoing abortion and non-pregnant women. Methods • Fifty-six women who had experienced spontaneous abortion and 39 women who had experienced artificial abortion were selected to obtain the decidual tissuescurettage vacuum aspiration, and 10 non-pregnant women (without infection) were selected to obtain the endometrial tissues through gynecological surgery Department of Gynecology in Huadong Hospital. Three groups of samples were subjected to high-throughput sequencing based on the V4 variable region of the 16S ribosomal RNA (rRNA) gene, and the bacterial composition of each group of samples was analyzed. The diversity of uterine microbiota was compared among three groups. Results • Low-abundance microbiomes were detected the decidual tissues of abortion women and the endometrial tissues of non-pregnant women. Proteobacteria was the main phylum of the three groups, and Escherichia/Shigella was the main genus. The diversity of uterine microbiota in spontaneous abortion group was higher than that in artificial abortion group. Conclusion • There is a low-abundance uterine microbiota mainly composed of Proteobacteria. The dominant bacteria at the level of phylum, family and genus has no significant difference between the spontaneous abortion group and the artificial abortion group, but there is higher flora diversity in the spontaneous abortion group than in the artificial abortion group. [ABSTRACT FROM AUTHOR]

In recent decades, polycrystalline diamond composite (PDC) bit has been rapidly developed, and becomes the main drill bit in oil drilling. However, the PDC hit is easy to he adhered by the debris in the mud layer, which leads to the failure of the drill and the accident of the well. In this paper, for PDC bit and mud lithic adhesion problems, biological non smooth surface technology is used to drill mud package control, through of natural organisms surface nonsmooth surface morphology analysis. A non-smooth surface model is established; non-smooth surface anti adhesion performance is tested, indoor experiment is carried out under the different forms of non-smooth surface specimen antiadhesion properties. This research provided new ideas and methods for the prevention and treatment of PDC bit balling. [ABSTRACT FROM AUTHOR]

In the process of reverse circulation drilling, compressed air goes through a reverse circulation experiment device to monitor the flow and pressure parameters. Then it is along the annular gap of the double wall drill pipe into the bottom of the well, through rotary injection hole of the reverse circulation bit, to form the rotating upwelling that has pumping action. Finally, cuttings are carried back to the surface along the center channel. According to the principle of reverse circulation drilling and structure of drilling tools, reverse circulation experiment device was developed. The experimental device can simulate the movement process of drilling fluid in the downhole, and verify and evaluate the effect of reverse circulation. The development of the reverse circulation experiment teaching device improved the experimental teaching of the air reverse circulation drilling technology and could stimulate the interest of the students to study the structure of the reverse circulation drilling tools. [ABSTRACT FROM AUTHOR]