Search

Copyright of Journal of Shanghai Jiao Tong University (1006-2467) is the property of Journal of Shanghai Jiao Tong University 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.)

The protective effects of chitosan-montmorillonite intercalation complex (CS-MMT) on the clinical symptoms, testicular morphology, and sperm quality of heat-stressed male mice were studied. Thirty 6-week-old male ICR mice were randomly divided into control group (CON group), heat stress group (HS group), low-dose CS-MMT group (L group, 50 mg/kg CS-MMT), middle-dose CS-MMT group (M group, 100 mg/kg CS-MMT), and high-dose CS-MMT group (H group, 200 mg/kg CS-MMT). The results showed that compared with CON group, the testicular tissue damage was obvious in HS group, sperm density was significantly decreased (P<0.05), sperm viability and acrosome integrity were extremely decreased (P<0.01), and the sperm malformation and acrosome malformation rates were extremely increased (P<0.01). Compared with HS group, the testicular tissue morphology and structure of mice in CS-MMT groups were significantly improved, the sperm density was increased, the sperm viability and acrosome integrity were extremely increased (P<0.01), and the sperm malformation and acrosome malformation rates were extremely decreased (P<0.01) in a dose-dependent manner. The study indicates that CS-MMT can alleviate the reproductive function damage induced by heat stress in male mice, and and the dosage of 200 mg/kg is better. [ABSTRACT FROM AUTHOR]

Aiming at the cementing problem of long open hole malignant leakage wells, the thermo-sensitive shape memory loss prevention spacer and foam leakage prevention cement slurry were developed, which synergistically reduce the cementing loss risk of long open hole malignant leakage loss wells. The thermo-sensitive shape memory material was developed, which resistance temperature is 150 ℃ and deformation memory temperature is 80～110 ℃, the length of thermo-sensitive shape memory mesh particles after deformation is 10 times that of normal temperature, and the diameter of shape memory expansion ball after expansion is 3 times that of normal temperature. The thermo-sensitive leak-proof spacer was developed, and the bearing-capacity of 3mm crack can reach 8.5MPa. Foaming agent and foam stabilizer were selected, and foam cement slurry were developed, and the density can be adjusted from 1.12 to 1.31 g/cm3, the difference between the upper and lower parts was less than 0.01 g/cm3, and the compressive strength of 1.12 g/cm3 foamed cement stone can reach 6.6 MPa at 30 ℃/72 h, and bubbles in set cement are uniformly dispersed. The spacer duration design method that considering the equivalent plugging time and washing efficiency was established, and the foamed cement slurry section constant gas injection method was formed. Based on thermo-sensitive anti-leakage spacer and foam cement slurry, The leak-proof cementing technology has been applied for 2 Wells, and the one-time sealing section length exceeds 4000 m, and the spacer and cement slurry returned to the surface successfully and got good results. [ABSTRACT FROM AUTHOR]

Copyright of Precious Metals / Guijinshu is the property of Precious Metals 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.)