The aim of the present experiment was to determine if there was an adaptation on plasma antioxidant capacities of yak under the malnutrition （fasting treatment）. Three castrated male yaks and equal numbers of indige...The aim of the present experiment was to determine if there was an adaptation on plasma antioxidant capacities of yak under the malnutrition （fasting treatment）. Three castrated male yaks and equal numbers of indigenous male cattle and of castrated male cattleyak with mean body weight of 146 ± 5.0, 116 ±3.0 and 149 ± 5.0 kg, respectively, were used. The fasting period lasted for 6 d. Results showed that： plasma total antoxidative capacity （T-AOC） was no differences between the genotypes on the fasting 1 st, 3rd, and 6th （P 〉 0.05）, but the values were linear greater with fasting days for yak, however, it was inverse for indigenous cattle or cattle-yak; plasma xanthine oxidase （XOD） activities of indigenous cattle were less than yak＇s and cattleyak＇s on the fasting 1st and 3rd day （P 〈 0.05）, but the value of indigenous cattle was greater than yak＇s and cattleyak＇s on the fasting 6th day （P 〈 0.05）. In a conclusion, plasma antioxidant capacities indicated that yaks have evolved an ability to survive in a starvation than indigenous cattle, and their crossbred-cattleyak also has inherited some of the adaptive characteristics.展开更多
To investigate the static compressive properties and mechanical damage evolution of rubber cement-based materials(RCBMs) with dry-and wet-curing conditions, uniaxial compression and cyclic loading-unloading tests were...To investigate the static compressive properties and mechanical damage evolution of rubber cement-based materials(RCBMs) with dry-and wet-curing conditions, uniaxial compression and cyclic loading-unloading tests were carried out on rubber cement mortar(RCM). The mechanical properties of the uniaxial compression specimens cured at 95%(wet-curing) and 50%(dry-curing) relative humidities and cyclic loading-unloading specimens cured at wet-curing were analyzed. Under uniaxial compression, the peak stress loss ratio is higher for dry-curing than for wet-curing. The peak strain decreases with the increase of rubber content, and the peak strain increases with the decrease of curing humidity. Under cyclic loading-unloading, the variation trends of residual strain differences of the normal cement mortar and RCM at each cyclic level with the number of cycles are basically the same, but the failure modes are different. The analysis of the internal mesostructure by a scanning electron microscope(SEM) shows that initial damage is further enhanced by reducing curing humidity and adding rubber aggregate. The damage constitutive model based on strain equivalence principle and statistical theories was used to describe the uniaxial compression characteristics of RCM, and the law of mechanical damage evolution was predicted.展开更多
Objective Exercise is known to enhance circulating brain-derived neurotrophic factor （BDNF） levels in healthy humans. BDNF changes have been measured in endurance but not in strength exercise. The present study aime...Objective Exercise is known to enhance circulating brain-derived neurotrophic factor （BDNF） levels in healthy humans. BDNF changes have been measured in endurance but not in strength exercise. The present study aimed to investigate whether anaerobic activity such as sprinting differentially alters basal plasma BDNF concentration. Methods Brazilian sprinters （100 m） at either the international （Olympics and Outdoor World Championships） （n = 14） or the domestic level （n = 8）, and sedentary subjects （n = 15）, were recruited. Plasma BDNF concentrations were analyzed by enzyme-linked immunosorbent assay. Results The basal plasma BDNF concentrations were significantly higher in the international and the domestic sprinters than in the sedentary subjects. In addition, sprinters at the international level had higher plasma BDNF concentrations than those at the domestic level. Conclusion Our findings suggest that increased basal plasma BDNF level is related to enhanced exercise performance.展开更多
文摘The aim of the present experiment was to determine if there was an adaptation on plasma antioxidant capacities of yak under the malnutrition （fasting treatment）. Three castrated male yaks and equal numbers of indigenous male cattle and of castrated male cattleyak with mean body weight of 146 ± 5.0, 116 ±3.0 and 149 ± 5.0 kg, respectively, were used. The fasting period lasted for 6 d. Results showed that： plasma total antoxidative capacity （T-AOC） was no differences between the genotypes on the fasting 1 st, 3rd, and 6th （P 〉 0.05）, but the values were linear greater with fasting days for yak, however, it was inverse for indigenous cattle or cattle-yak; plasma xanthine oxidase （XOD） activities of indigenous cattle were less than yak＇s and cattleyak＇s on the fasting 1st and 3rd day （P 〈 0.05）, but the value of indigenous cattle was greater than yak＇s and cattleyak＇s on the fasting 6th day （P 〈 0.05）. In a conclusion, plasma antioxidant capacities indicated that yaks have evolved an ability to survive in a starvation than indigenous cattle, and their crossbred-cattleyak also has inherited some of the adaptive characteristics.
基金Projects(52008003,52074009)supported by the National Natural Science Foundation of ChinaProject(201904a07020081)supported by the Key Research and Development Program Project of Anhui Province,ChinaProject(1908085QE213)supported by the Nature Science Foundation of Anhui Province,China。
文摘To investigate the static compressive properties and mechanical damage evolution of rubber cement-based materials(RCBMs) with dry-and wet-curing conditions, uniaxial compression and cyclic loading-unloading tests were carried out on rubber cement mortar(RCM). The mechanical properties of the uniaxial compression specimens cured at 95%(wet-curing) and 50%(dry-curing) relative humidities and cyclic loading-unloading specimens cured at wet-curing were analyzed. Under uniaxial compression, the peak stress loss ratio is higher for dry-curing than for wet-curing. The peak strain decreases with the increase of rubber content, and the peak strain increases with the decrease of curing humidity. Under cyclic loading-unloading, the variation trends of residual strain differences of the normal cement mortar and RCM at each cyclic level with the number of cycles are basically the same, but the failure modes are different. The analysis of the internal mesostructure by a scanning electron microscope(SEM) shows that initial damage is further enhanced by reducing curing humidity and adding rubber aggregate. The damage constitutive model based on strain equivalence principle and statistical theories was used to describe the uniaxial compression characteristics of RCM, and the law of mechanical damage evolution was predicted.
基金supported by Coordenao de Aperfeioamento de Pessoal de Nível Superior(CAPES)Fundao de Amparo à Pesquisa do Estado de So Paulo(FAPESP)+2 种基金Conselho Nacional de Desenvolvimento Científico e Tecnológico(CNPq)Instituto Nacional de Neurociência Translacional(INNT)Cooperao Interinstitucional de Apoio a Pesquisas sobre o Cérebro(CInAPCe),Brazil
文摘Objective Exercise is known to enhance circulating brain-derived neurotrophic factor （BDNF） levels in healthy humans. BDNF changes have been measured in endurance but not in strength exercise. The present study aimed to investigate whether anaerobic activity such as sprinting differentially alters basal plasma BDNF concentration. Methods Brazilian sprinters （100 m） at either the international （Olympics and Outdoor World Championships） （n = 14） or the domestic level （n = 8）, and sedentary subjects （n = 15）, were recruited. Plasma BDNF concentrations were analyzed by enzyme-linked immunosorbent assay. Results The basal plasma BDNF concentrations were significantly higher in the international and the domestic sprinters than in the sedentary subjects. In addition, sprinters at the international level had higher plasma BDNF concentrations than those at the domestic level. Conclusion Our findings suggest that increased basal plasma BDNF level is related to enhanced exercise performance.
