Showing papers by "Jian Jin published in 2006"

Interaction between phosphorus nutrition and drought on grain yield, and assimilation of phosphorus and nitrogen in two soybean cultivars differing in protein concentration in grains.

Abstract: Drought affects many physiological and biochemical processes and thus reduces plant growth. Phosphorus (P) fertilization improves tolerance to drought stress in many plants. A greenhouse experiment examined the interactive effects of P nutrition and drought stress on P accumulation and translocation, yield, and protein concentration in grains of two cultivars of soybean [Glycine max (L.) Merr.]. Plants of cultivars ‘Heisheng 101’ (high protein in grains) and ‘Dongnong 464’ (low protein) were grown in a P-deficient soil supplied with 0–30 mg P kg−1 soil. Drought stress was imposed at the initial flowering (R1) or the podding (R4) stage. Drought stress limited P accumulation and reduced P translocation to the seed. The addition of P enhanced the concentration and accumulation of nitrogen (N) and P in shoots and seeds of both cultivars. Drought stress decreased shoot biomass, grain yield, and P accumulation; the decrease was greater in ‘Dongnong 46’ than ‘Heisheng 101,’ and even more so if drought s...

Formation of Positively Charged Copper Hydroxide Nanostrands and Their Structural Characterization

Abstract: Extremely narrow copper hydroxide nanostrands with a diameter of 2.5 nm were prepared by controlling the pH of an aqueous copper nitrate solution with weak bases. The nanostrands grew slowly from initially formed small particles of 2−6 nm. The growth was highly sensitive to the amount and types of weak bases. Long nanostrands were obtained in a range of pH 6.0−6.2 at a concentration of approximate 2 mM copper nitrate. The length reached several tens of micrometers after an aging time of a few days, giving an aspect ratio more than tens of thousands. Their structures were characterized by scanning electron microscopy, transmission electron microscopy (TEM), and electron diffraction. This nanostrand is composed of positively charged linear clusters, [Cu8(OH)14(H2O)4]2+, as judged from the results of high-resolution TEM, UV−vis titration experiments, and crystallographic considerations. We widely investigated the nanomorphologies of copper hydroxide and related compounds by changing the synthetic conditions ...