Background and Aims Although many hypotheses have been proposed to explain variation in leaf size, the mechanism underlying the variation remains not fully understood. To help understand leaf size variation, the cost/benefit of twig size was analysed, since, according to Corner’s rule, twig size is positively correlated with the size of appendages the twig bears. Methods An extensive survey…
Abstract. Ni-doped ZnO rod arrays were successfully prepared on glass substrate from the aqueous solution at a temperature of 80 ◦C. The densities, diameters, and lengths of the rods can easily be well controlled through the concentrations of dopants, and the dopant Ni ions were incorporated into the wurtzitestructure of ZnO crystal. Room temperature photoluminescence spectrum of rod arra…