[Effects of potassium on nitrogen translocation and distribution and nitrogen metabolism enzyme activities of sweet potato.].

A pot experiment with N tracing techniques was designed to study the effect of potassium application on nitrogen transfer, photosynthetic characteristics and nitrogen metabolism enzyme activities in two different growth stages of sweet potato. Results indicated that potassium application significantly increased the shoot N distribution rate. Compared with control, the N transfer rate of K treatment increased by 76.

[Protective effects of total epimedium flavonoids against QA-induced toxicity in SH-SY5Y cells].

Objective: To investigate the protective effects and its mechanisms of total epimedium flavonoids (TEF) against Quindinince acid (QA)-induced toxicity in SH-SY5Y cells.

Methods: The MT assay was used to detect the toxicity of QA and the cell viability of pretreatment of TEF and co-incubation with QA in SH-SY5Y cells; Cell apoptosis was observed by Hochest33258 staining; SOD and GSH-Px activities as well as MDA content were measured by colorimetric method; The mitochondrial membrane potential (delta psi m) and intracellular free calcium concentration ([Ca2+]i) were monitored by FCM.

Results: TEF increased the cell viability of SH-SY5Y cells, reduced apoptosis cells significantly, improved SOD and GSH-Px activities, decreased MDA content, increased the mitochondrial membrane potential and reduced intracellular free calcium concentration( [Ca2+]i ).

[Distribution characteristics of phthalic acid esters in soils and peanut kernels in main peanut producing areas of Shandong Province, China].

Surface soil (0-20 cm) and peanut kernel samples were collected in four main peanut producing areas of Shandong Province, and the contents of six PAEs chemicals that classified by the U. S. Environmental Protection Agency as priority pollutants were determined by gas chromatography (GC).

[Phthalic acid esters (PAEs) pollution in farmland soils: a review].

The environmental pollution and food safety problems caused by phthalic acid esters (PAEs) have been attracted 'extensive attention around the world. As a large PAEs producer and consumer, China is facing severe PAEs environmental pollution problems. This paper reviewed the present pollution status of six PAEs classified by the U.