[Photosynthetic characteristics of and in artificial grassland].

To explore the effect of monoculture and mixture sowing artificial grassland on the photosynthetic characteristics of and , we determined the diurnal variation of photosynthetic properties of and under different treatments. The results showed that the diurnal changes of net photosynthetic rate, blade temperature and transpiration rate of and showed 'unimodal type' in monoculture, the stomatal conductance of showed 'unimodal type', and the stomatal conductance and water use efficiency of showed 'bimodal type'. Under the mixed sowing treatment, the diurnal changes of net photosynthetic rate, blade temperature and transpiration rate of and showed 'unimodal type', the stomatal conductance and water use efficiency of showed 'unimodal type', and the stomatal conductance of showed 'bimodal type'.

Trade-off relationship and internal mechanism of plant leaf size and number in Hulunbuir grassland, China.

The trade-off between leaf size and number is the basis for plant growth strategies. It is of great significance to study the underlying mechanism of leaf size and number trade-offs for well understanding plant growth strategies. In this study, leaf size was expressed by the dry mass of single leaf, while leafing intensity was expressed by the number of leaves per unit stem volume.

Genistein attenuates brain damage induced by transient cerebral ischemia through up-regulation of Nrf2 expression in ovariectomized rats.

Objective: Postmenopausal women possess higher incidence of stroke and worse prognosis. Although estrogen replacement therapy has obvious neuroprotective effects against stroke, it is always accompanied with several adverse effects and undesired outcomes. Genistein, a natural phytoestrogen, has been indicated to be a potential neuroprotective alternative for postmenopausal women against stroke.

[Salinization-alkalization of Leymus chinensis grassland in Songnen Plain of Northeast China].

Field survey and site study were conducted to approach the process and causes of salinization-alkalization of Leymus chinensis grassland in Songnen Plain, and to examine the hypothesis of soil disturbance-bareness. In the grassland, surface soil (0-30 cm) had a lower salt content, while deeper soil (> 30 cm) was in adverse. Thereby, the grassland was defined as soil-salted grassland.

[The study on the UV and fluorescence properties of PAMAM dendrimers].

From 0.5 to 5.0 generation PAMAM dendrimers were synthesized with ethylenediamine core by Michael addition reaction and aminolysis reaction two repeated steps.