OBJECTIVE To investigate the regulative effect of aqueous extract of Eichhornia crassipes on the oxygen uptake capacity and motion responses of mice under wet/cool stress. METHODS KM mice were randomly divided into no...OBJECTIVE To investigate the regulative effect of aqueous extract of Eichhornia crassipes on the oxygen uptake capacity and motion responses of mice under wet/cool stress. METHODS KM mice were randomly divided into normal control group,model control group,Eichhornia crassipes lowdose group(0.5g·kg-1)and high dose group(1.5g·kg-1),then performed intragastric administration for a period of 7d.Wet/cold stressed mice model was established using repeated intermittent(3h·d-1,consecutive 7d)exposure method by placing mice into the exposure box which was covered by ice at the bottom(T<0℃;RH>85%).Oxygen consumption was observed during exposure.Inclined plane method(muscle coordination capacity test)was performed immediately after exposure.60-second video of exhaustive swimming(to calculate swimming speed)was taken 1hafter the last exposure,the exhaustive swimming time was recorded.RESULTS(1)Compared with normal control group,model control group showed significant improvement in oxygen consumption(P<0.01),with an increase up to 77.33%,while inclined plate time,swimming speed and exhaustive swimming time showed significant reduction(P<0.01),at the rates 46.3%,8.54% and 19.68%respectively.(2)Compared with normal control group,Eichhornia crassipes low dose group and high dose group both improved oxygen consumption significantly(P<0.01),at rates of 10.93% and 90.38%respectively.This indicated high-dose aqueous extract of Eichhornia crassipes could fulfil actual oxygen demand of wet/cold stressed mice effectively.Inclined plate and exhaustive swimming experiments indicated that low-dose aqueous extract of Eichhornia crassipes boosted physical power significantly,as its exhaustive swimming time was increased up to 56.61%.Meanwhile,high-dose aqueous extract of Eichhornia crassipes has significant regulative effect on muscle coordination capability and motion speed,which were increased by 17.38% and 11.17%,respectively.CONCLUSION Aqueous extract of Eichhornia crassipes has definite regulative effect on the oxygen uptake capacity and motion responses of wet/cold stressed mice.Aqueous extract of Eichhornia crassipes can achieve stress protective effect by improving oxygen uptake capacity,muscle coordination capacity and motion abilities.展开更多
Effect of trace O element on the high-temperature wettability between Ni3Al scrap melt and Y2O3 ceramic at 1873 K is investigated. With the increase in O content in Ni3Al scrap melt from 6 to 21 ppm, the equilibrium c...Effect of trace O element on the high-temperature wettability between Ni3Al scrap melt and Y2O3 ceramic at 1873 K is investigated. With the increase in O content in Ni3Al scrap melt from 6 to 21 ppm, the equilibrium contact angle decreases from 93.3° to 88.9°. The initial surface tension and adhesive work of molten Ni3Al scrap drop from 3153.5 to 807.4 mN m^-1 and from 2974.6 to 882.2 mN m^-1, respectively. The average spreading rate increases from 0.03° s^-1 to 0.17° s^-1. The whole wetting processes are divided into four periods. The main driving force for spreading in period（1） is the adsorption and diffusion of active atoms around the interface. Trace O content in Ni3Al scrap has a significant impact on interfacial reactions which mostly take place in the second stage, and can accelerate the spreading process on Y2O3 substrate. The reaction products during wetting process are Y3Al5O12, YAlO3 and Al2O3.展开更多
The accurate measurements of the surface tension for molten silicon are not easy to be carried out.The major problem comes from the fact that it is very difficult to avoid the contamination of silicon surface by oxyge...The accurate measurements of the surface tension for molten silicon are not easy to be carried out.The major problem comes from the fact that it is very difficult to avoid the contamination of silicon surface by oxygen arising from experimental atmosphere or from the starting materials.Indirect determination of this physical property for liquid silicon is thus of interests.In the present work,wetting experiments have per- formed for molten silicon on very pure and dense glassy carbon substratc at oxygen partial pressures well below and above the saturation limit of oxygen in the liquid metal.Analyses of the wetting results,together with the experimental results reported in the literature for the surface tension values of molten silicon,ena- ble the surface tension of pure and clean liquid silicon to bc deduced.展开更多
It has been generally recognised that the metal catalysts supported on oxide ceramic and non-oxide ceramic supports exhibit completely different characteristics as compared with the homogeneous ones. The na-ture of bo...It has been generally recognised that the metal catalysts supported on oxide ceramic and non-oxide ceramic supports exhibit completely different characteristics as compared with the homogeneous ones. The na-ture of bonding and interactions occurring at the metal / ceramic interfaces are believed to be of importancefor the characteristics of such catalysts. The recently developed microscopic theory of adhesion and wettingin metal/ ceramic systems is briefly presented here with the emphasis on the ionocovalent oxide ceramics.and its consequence on the understanding of the physical and chemical behaviours of supported metal cata-lysts is exploited.展开更多
基金The project supported by National Natural Science Foundation of China(41275159)Key original item of Shenyang Normal University(201201)
文摘OBJECTIVE To investigate the regulative effect of aqueous extract of Eichhornia crassipes on the oxygen uptake capacity and motion responses of mice under wet/cool stress. METHODS KM mice were randomly divided into normal control group,model control group,Eichhornia crassipes lowdose group(0.5g·kg-1)and high dose group(1.5g·kg-1),then performed intragastric administration for a period of 7d.Wet/cold stressed mice model was established using repeated intermittent(3h·d-1,consecutive 7d)exposure method by placing mice into the exposure box which was covered by ice at the bottom(T<0℃;RH>85%).Oxygen consumption was observed during exposure.Inclined plane method(muscle coordination capacity test)was performed immediately after exposure.60-second video of exhaustive swimming(to calculate swimming speed)was taken 1hafter the last exposure,the exhaustive swimming time was recorded.RESULTS(1)Compared with normal control group,model control group showed significant improvement in oxygen consumption(P<0.01),with an increase up to 77.33%,while inclined plate time,swimming speed and exhaustive swimming time showed significant reduction(P<0.01),at the rates 46.3%,8.54% and 19.68%respectively.(2)Compared with normal control group,Eichhornia crassipes low dose group and high dose group both improved oxygen consumption significantly(P<0.01),at rates of 10.93% and 90.38%respectively.This indicated high-dose aqueous extract of Eichhornia crassipes could fulfil actual oxygen demand of wet/cold stressed mice effectively.Inclined plate and exhaustive swimming experiments indicated that low-dose aqueous extract of Eichhornia crassipes boosted physical power significantly,as its exhaustive swimming time was increased up to 56.61%.Meanwhile,high-dose aqueous extract of Eichhornia crassipes has significant regulative effect on muscle coordination capability and motion speed,which were increased by 17.38% and 11.17%,respectively.CONCLUSION Aqueous extract of Eichhornia crassipes has definite regulative effect on the oxygen uptake capacity and motion responses of wet/cold stressed mice.Aqueous extract of Eichhornia crassipes can achieve stress protective effect by improving oxygen uptake capacity,muscle coordination capacity and motion abilities.
基金supported financially by the National Science & Technology Pillar Program of China (No. 2013BAB11B04)the National Natural Science Foundation of China (No. 51404017)
文摘Effect of trace O element on the high-temperature wettability between Ni3Al scrap melt and Y2O3 ceramic at 1873 K is investigated. With the increase in O content in Ni3Al scrap melt from 6 to 21 ppm, the equilibrium contact angle decreases from 93.3° to 88.9°. The initial surface tension and adhesive work of molten Ni3Al scrap drop from 3153.5 to 807.4 mN m^-1 and from 2974.6 to 882.2 mN m^-1, respectively. The average spreading rate increases from 0.03° s^-1 to 0.17° s^-1. The whole wetting processes are divided into four periods. The main driving force for spreading in period（1） is the adsorption and diffusion of active atoms around the interface. Trace O content in Ni3Al scrap has a significant impact on interfacial reactions which mostly take place in the second stage, and can accelerate the spreading process on Y2O3 substrate. The reaction products during wetting process are Y3Al5O12, YAlO3 and Al2O3.
文摘The accurate measurements of the surface tension for molten silicon are not easy to be carried out.The major problem comes from the fact that it is very difficult to avoid the contamination of silicon surface by oxygen arising from experimental atmosphere or from the starting materials.Indirect determination of this physical property for liquid silicon is thus of interests.In the present work,wetting experiments have per- formed for molten silicon on very pure and dense glassy carbon substratc at oxygen partial pressures well below and above the saturation limit of oxygen in the liquid metal.Analyses of the wetting results,together with the experimental results reported in the literature for the surface tension values of molten silicon,ena- ble the surface tension of pure and clean liquid silicon to bc deduced.
文摘It has been generally recognised that the metal catalysts supported on oxide ceramic and non-oxide ceramic supports exhibit completely different characteristics as compared with the homogeneous ones. The na-ture of bonding and interactions occurring at the metal / ceramic interfaces are believed to be of importancefor the characteristics of such catalysts. The recently developed microscopic theory of adhesion and wettingin metal/ ceramic systems is briefly presented here with the emphasis on the ionocovalent oxide ceramics.and its consequence on the understanding of the physical and chemical behaviours of supported metal cata-lysts is exploited.
