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For the study of ship under large angle and high flow velocity and the collision response of large span cable-stayed bridge, Domestic and foreign relevant specifications for maximum impact force calculation method in ship bridge collision and impact was combined, in the process of inland waterway transport possible collision angle and the way was analyzed, and the outer ring of the Chongqing metro, Yangtze river bridge was taken as the project. The models of 7 000-ton bulk carrier and proportional cable-stayed bridge are established by using the additional mass method, and the maximum impact forces of forward collision, side collision and drift collision are calculated at four navigable water levels. The calculated values of each code are compared with the numerical simulation results, and the calculated results of each code under different conditions are compared. The results show that the domestic and foreign codes are more suitable for the ship impacting the bridge tower, and the maximum impact force is much higher than the calculated value of the code when the impact point is located at the bridge cap. In the case of a frontal collision between a ship and a bridge, the calculated values in AASHTO (American Association of State Highway and Transportation Officials) are in high agreement with the simulated values. In side impact, especially when the impact angle is10° ~ 25°, it is suggested to adopt the Specifications for Collision Design of Highway Bridges. The impact force caused by the ship's floating collision with the bridge tower is about 1 / 4 of the forward collision, which can be calculated by the Code for Design of Railway Bridges and Culverts. The research results of multi-angle ship-bridge collision can provide reference for ship-bridge collision safety risk assessment and bridge anti-collision design under high fluctuating water level in the Three Gorges reservoir area. [ABSTRACT FROM AUTHOR]

The dry Maillard reaction method was used to glycosylate rice bran globulin. On this basis, the noncovalent binding of glycosylated rice bran globulin with two polyphenols was studied. The interaction mechanism between them was characterized and analyzed by fluorescence spectroscopy, infrared spectroscopy, differential scanning calorimetry, etc. The results showed that the micromorphology of rice bran globulin was changed after glycosylation, and the anti-digestibility and antioxidant properties were improved. Quercetin and resveratrol could both cause fluorescence quenching of glycosylated proteins, and resveratrol caused a red shift in the emission peak of glycosylated proteins. In this non-covalent binding, hydrogen bonding/van der Waals forces played a major role. Fluorescence fitting data showed that glycosylated proteins could bind both resveratrol and quercetin simultaneously, with binding sites and constants of 0.014 7 and 0.002 23, respectively. The binding ability was lower than that of binding resveratrol or quercetin molecules separately. The particle sizes of glycosylated proteins and glycosylated protein-polyphenol non-covalent complexes were higher than that of rice bran globulin, and the maximum particle size occurred when glycosylated proteins were bound to two polyphenols simultaneously. In addition, the non-covalent binding of glycosylated proteins with two polyphenols could significantly improve the protein’s thermal stability and antioxidant capacity, and this improvement was situated between the glycosylated proteins binding to resveratrol and quercetin molecules alone. [ABSTRACT FROM AUTHOR]

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Copyright of Journal of South-Central Minzu University (Natural Science Edition) is the property of Journal of South-Central Minzu 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.)

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.)

Objective: To analyze the efficacy of radiofrequency ablation combined with modified maze in the treatment of patients with atrial fibrillation caused by valvular disease and its effect on the serum cytokines. Methods: 80 patients with valvular heart disease complicated with atrial fibrillation were divided into control group and observation group according to simple random method, 40 cases in each group, the control group was treated with cardiac valve replacement, while the observation group was treated with valve surgery concomitant radiofrequency ablation modified maze. The sinus rhythm reversion, operation conditions, changes of cardiac function, levels of metalloproteinase-1(TIMP-1), matrix metalloproteinase-1(MMP-1) and matrix metalloproteinase-9(MMP-9) before and after operation, and occurrence of postoperative complications were compared between the two groups. Results: The sinus rhythm conversion rates of observation group on the day after operation, at 1, 3, 6 month after operation were significant higher than those of the control group(P<0.05). The extracorporeal circulation time, aortic occlusion time and postoperative 24 h drainage volume were significantly higher than those in the control group(P<0.05). there was no significant difference between the two groups in the ventilator usage time and intensive care unit time(P>0.05). At six months after operation, the left ventricular end diastolic diameter, left ventricular end systolic diameter, serum levels of MMP-1 and MMP-9 in both groups were significantly lower than those before operation, and the above indexes in the observation group were significantly lower than those in the control group. The levels of LVEF and TIMP-1 in serum of the two groups were significantly higher than those before operation, which were higher in the observation group than that of the control group(P<0.05). No severe complication occurred in both groups. Conclusion: Valve surgery concomitant radiofrequency ablation modified maze is safe and effective in the treatment of atrial fibrillation complicated by valvular heart disease, has high conversion rate of early sinus rhythm, and can improve the serum levels of TIMP-1, MMP-1 and MMP-9. [ABSTRACT FROM AUTHOR]