Calphad: Computer Coupling of Phase Diagrams and Thermochemistry,2001年25(2):305-317 ISSN：0364-5916
[Zhang, YL; Jin, ZP] State Key Laboratory for Powder Metallurgy, Central South University of Technology410083, P.R. China;[Liu, HS] P.D. Center, Materials Science and Engineering, Central South University of Technology, Changsha, Hunan, 410083, China
[Zhang, YL] Cent S Univ, State Key Lab Powder Met, Changsha 410083, Hunan, Peoples R China.
Annual Meeting of the Minerals-Metals-and-Materials-Society (TMS)
FEB 12-15, 2001
NEW ORLEANS, LA
Cent S Univ, State Key Lab Powder Met, Changsha 410083, Hunan, Peoples R China.^Cent S Univ, PD Ctr Mat Sci & Engn, Changsha 410083, Peoples R China.
Metastable chemical spinodal curve - Regular solution model - Thermodynamic assessment
The thermodynamic properties of the Nb-Ti system have been evaluated by using a regular solution model to describe the Gibbs energies of various phases including both equilibrium and metastable phases. A set of thermodynamic parameters more consistent with most of the selected experimental data than previous assessments has been obtained. Stable and metastable phase equilibria, T<inf>0</inf> loci, metastable chemical spinodal curve of βphase and thermodynamic properties are calculated with the optimized parameters. With the thermodynamic parameters obtained in this work, authors discuss the possible occurrence range of ωphase.
Background: The fleshy root of Panax ginseng C.A. Meyer (ginseng) is one of the most well-known and valued herbs in traditional Chinese medicine. Ginsenosides are considered mainly responsible for the pharmacological activities of ginseng. The purpose of this study was to investigate the effects of ginsenoside-Rb 1 (G-Rb 1 ) on swimming exercise-induced oxidative stress in male mice. Materials and Methods: A total of 48 animals were randomly divided into four groups, with twelve mice in each group. The first, second and third groups were designed as G-Rb 1 treatment groups, got 25, 50 and 100 mg/kg bodyweight of G-Rb 1 , respectively. The fourth group was designed as the control group, got physiologic saline. The mice were intragastrically administered once daily for 4 weeks. The weight-loaded forced swimming test was conducted on the final day of experimentation. Then the exhaustive swimming time, blood lactate, serum creatine kinase (CK), malondialdehyde (MDA) and antioxidant enzymes in liver of mice were measured. Results: The results showed that G-Rb 1 could prolong the exhaustive swimming time and improve exercise endurance capacity of mice, as well as accelerate the clearance of blood lactate and decrease serum CK activities. Meanwhile, G-Rb 1 could decrease MDA contents and increase superoxide dismutase, catalase, glutathione peroxidase activities in liver of mice. Conclusions: The study suggested that G-Rb 1 possessed protective effects on swimming exercise-induced oxidative stress in mice.
This study aims to assess the effects of Achyranthes bidentata polysaccharides (ABPS) on the expression of bcl-2 and bax in hepatic tissues after exhaustive exercise in order to provide theoretical support for the application of ABPS in the field of sports nutrition. Thirty male Sprague-Dawley rats were randomized into three groups, each consisting of 10 rats: Normal control group (NCG), Exhausting exercises control group (EECG), ABPS treated group (ATG). ABPS were fed orally by gastric intubation to rats of ABPS treated group (ATG) once daily for 7 days. Control animals (EECG and NCG) received the same amount of isotonic sodium chloride solution. Exhaustive exercise was performed on a rodent treadmill. The SP (streptavidin peroxidase) method for immunohistochemical staining was adopted to test the protein expression of bax and bcl-2 in the hepatic tissues of the rats. Exhausting exercises increased bax protein expression of hepatic tissues of rats and bax/bcl-2 ratio dramatically, but a decreased bcl-2 protein expression. In the rats fed ABPS orally by gastric intubation, the bax protein expression and bax/bcl-2 ratio obviously decreased, while bcl-2 protein expression increased. The result indicated that bax and bcl-2 co-regulated the exercise-induced hepatocyte apoptosis. Feeding ABPS orally by gastric intubation to rats can inhibit the hepatocyte apoptosis in exhaustive exercise.
thermodynamic assessment of the Ru-Si system;binary system Ru-Si
A consistent thermodynamic data set for the Ru-Si system is obtained by a computer-aided least-squares method applied to the experimental phase diagram and thermodynamic data. The liquid phase is described by the Redlich-Kister formula. All of the compounds, Ru2Si, Ru4Si3, RuSi, and Ru2Si3, are treated as stoichiometric phases. Comparisons between the calculated and measured phase diagram and thermodynamic quantities show that all of the accurate experimental information is well accounted for by the thermodynamic description.