Dual Separation of Krypton and Argon from Environmental Samples for Radioisotope Dating.

The noble gas radioisotopes Kr, Kr, and Ar are nearly ideal environmental tracers because of their chemical inertness and simple transport mechanisms. Recent advances in Atom Trap Trace Analysis have enabled measurements of Kr and Kr using 10-20 kg of water or ice, and Ar in only a few kilograms, making these tracers available to be applied in the earth sciences on a large-scale. To meet the resulting increase in demand, we have developed an automated process for the dual separation of krypton and argon from environmental samples based on titanium gettering and gas chromatography.

[The influence of miR-21 on HK-2 EMT cells induced by TGF-beta 1].

Objective: To investigate the effect of the miR-21 and its target mRNA in renal tubular epithelial mesenchymal transformation (EMT) model induced by transformation growth factor-β1(TGF-β1) in human renal tubular epithelial (HK-2) cells.

Methods: HK-2 cells were divided into 6 groups:normal control group, TGF-β1 group, miR-21 mimic negative group, miR-21 mimic group, miR-21 inhibitor negative group and miR-21 inhibitor group. EMT model was established in HK-2 cells induced by 4 ng/ml TGF-β1.