Based on a low-temperature route, monodispersed CoFe2O4 microspheres (MSs) were fabricated through aggregation of primary nanoparticles. The microstructural and magnetic characteristics of the as-prepared MSs were characterized by X-ray diffraction/photoelectron spectroscopy, scanning/transmitting electron microscopy, and vibrating sample magnetometer. The results indicate that the diameters of CoFe2O4 MSs with narrow size distribution can be tuned from over 200 to ~330 nm. Magnetic measurements reveal these MSs exhibit superparamagnetic behavior at room temperature with high saturation magnetization. Furthermore, the mechanism of formation of the monodispersed CoFe2O4 MSs was discussed on the basis of time-dependent experiments, in which hydrophilic PVP plays a crucial role.
The abscisic acid (ABA) content of the root tips of four crops grown in lanthanide chloride solution and their root lengths had been determined. At lanthanide concentrations of 5 and 10 ppm, these crops all grew well and the ABA decreased. At higher lanthanide concentrations (100-500 ppm), the ABA is increased again. At these concentrations of lanthanum chloride, the photosystems I and II (PSI and PSII) and whole electron chain transport activities were inhibited. PSII was more sensitive than PSI, and it is concluded that La3+ acts on the diphenylcarbazide (DPC) action place of PSII oxidizing site.
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