Grapes are important sources of antioxidants compounds and one of the most used varieties to elaborate juices is ＂Isabel＂, or ＂Isabella＂, as it is called in North-America. This study aimed to evaluate the antioxid...Grapes are important sources of antioxidants compounds and one of the most used varieties to elaborate juices is ＂Isabel＂, or ＂Isabella＂, as it is called in North-America. This study aimed to evaluate the antioxidant activity of Isabella grape juices from the tropical semi-arid climate produced in Brazil on March and September, 2010. Total phenolics and anthocyanins were determined, as well as the antioxidant capacity by DPPH, FRAP and hydrophilic ORAC methods. Test T was used to compare statistical difference at 5% of significance level. As expected, the results showed that the season can play a significant role on phenolics content and antioxidant power. Polyphenols content in juices varied from 82.9 ± 0.92 to 102.2± 1.59 mg GAE 100 mL1- and anthocyanins content ranged from 44.3 ± 2.01 to 129.5 ± 2.82 mg cyanidin-3-glucoside 100 mL-1. Regression analyses showed a high correlation of antioxidant capacity and anthocyanins content. Grapes from Sao Francisco River Valley demonstrated to be a good source of antioxidant for human diet.展开更多
Objective： To create a 3-dimensional finite element model of knee ligaments and to analyse the stress changes of lateral collateral ligament （LCL） with or without displaced movements at different knee flexion condi...Objective： To create a 3-dimensional finite element model of knee ligaments and to analyse the stress changes of lateral collateral ligament （LCL） with or without displaced movements at different knee flexion conditions. Methods： A four-major-ligament contained knee specimen from an adult died of skull injury was prepared for CT scanning with the detectable ligament insertion footprints, locations and orientations precisely marked in advance. The CT scanning images were converted to a 3-dimensional model of the knee with the 3-dimensional reconstruction technique and transformed into finite element model by the software of ANSYS. The model was validated using experimental and numerical results obtained by other scientists. The natural stress changes of LCL at five different knee flexion angles （0°, 30°60°, 90°, 120°） and under various motions of anterior-posterior tibial translation, tibial varus rotation and internal-external tibial rotation were measured. Results： The maximum stress reached to 87%-113% versus natural stress in varus motion at early 30° of knee flexions. The stress values were smaller than the peak value of natural stress at 0° （knee full extension） when knee bending was over 60° of flexion in anterior-posterior tibial translation and internal-external rotation. Conclusion： LCL is vulnerable to varus motion in almost all knee bending positions and susceptible to ante- rior-posterior tibial translation or internal-external rotation at early 30° of knee flexions.展开更多
文摘Grapes are important sources of antioxidants compounds and one of the most used varieties to elaborate juices is ＂Isabel＂, or ＂Isabella＂, as it is called in North-America. This study aimed to evaluate the antioxidant activity of Isabella grape juices from the tropical semi-arid climate produced in Brazil on March and September, 2010. Total phenolics and anthocyanins were determined, as well as the antioxidant capacity by DPPH, FRAP and hydrophilic ORAC methods. Test T was used to compare statistical difference at 5% of significance level. As expected, the results showed that the season can play a significant role on phenolics content and antioxidant power. Polyphenols content in juices varied from 82.9 ± 0.92 to 102.2± 1.59 mg GAE 100 mL1- and anthocyanins content ranged from 44.3 ± 2.01 to 129.5 ± 2.82 mg cyanidin-3-glucoside 100 mL-1. Regression analyses showed a high correlation of antioxidant capacity and anthocyanins content. Grapes from Sao Francisco River Valley demonstrated to be a good source of antioxidant for human diet.
文摘Objective： To create a 3-dimensional finite element model of knee ligaments and to analyse the stress changes of lateral collateral ligament （LCL） with or without displaced movements at different knee flexion conditions. Methods： A four-major-ligament contained knee specimen from an adult died of skull injury was prepared for CT scanning with the detectable ligament insertion footprints, locations and orientations precisely marked in advance. The CT scanning images were converted to a 3-dimensional model of the knee with the 3-dimensional reconstruction technique and transformed into finite element model by the software of ANSYS. The model was validated using experimental and numerical results obtained by other scientists. The natural stress changes of LCL at five different knee flexion angles （0°, 30°60°, 90°, 120°） and under various motions of anterior-posterior tibial translation, tibial varus rotation and internal-external tibial rotation were measured. Results： The maximum stress reached to 87%-113% versus natural stress in varus motion at early 30° of knee flexions. The stress values were smaller than the peak value of natural stress at 0° （knee full extension） when knee bending was over 60° of flexion in anterior-posterior tibial translation and internal-external rotation. Conclusion： LCL is vulnerable to varus motion in almost all knee bending positions and susceptible to ante- rior-posterior tibial translation or internal-external rotation at early 30° of knee flexions.
