Inhibition of net photosynthesis (Pn) by moderate heat stress has been attributed to an inability of Rubisco activase to maintain Rubisco in an active form. To examine this proposal, the temperature response of Pn, Rubisco activation, chlorophyll fluorescence, and the activities of Rubisco and Rubisco activase were examined in species from contrasting environments. The temperature optimum of Ru...

Double-layer composite water-lubricated bearing is a new type of which can integrate the good damping performance low elastic under-layer bush and tribological plastic layer bush. This paper analyzes its elastohydrodynamic lubrication by fluid–structure interaction (FSI) method, studies effects eccentricity ratio, rotational speed, modulus distribution thickness on performance. Results show tha...

Larrea tridentata (creosote bush) is a plant that grows abundantly in the desert environment. This desert plant has been found naturally growing in heavy-metal contaminated soils. Previous experiments showed that the inactivated biomass of creosote bush was able to adsorb Cu(II) ions from aqueous solutions. The copper-binding capacity of the bush biomass that grows in heavy-metal uncontaminated...

WASHINGTONPresident Bush pledged Tuesday to sub­ mit detailed revisions to Ronald R eagan’s budget next month and suggested highlevel negotiations between the White House and Congress to produce an early agreem ent. The White House acknowl­ edged that Bush had not kept his prom ise to send his team of budget negotiators to Congress on the first day of his presidency. Likewise, it ap­ peared unl...