Research development of endocrine disrupting chemicals (EDCs) in water in China.
More and more importance has been attached to the problem of endocrine disrupting chemicals (EDCs) since 1960s. This article elaborates the recent research progress of EDCs in water and the trends in the near future in China.
Advances of endocrine disrupting chemicals research
It has been suggested that endocrine disrupting chemicals capable of modulating the endocrine system may contribute to adverse health, reproduction, and developmental effects in human and wildlife. This article reviews the evidence, mechanism, testing strategies and several major analysis methods. The screening and testing methods of endocrine disrupting chemicals and the challenge to analysis technology are discussed.
Photoinduced spin-state transition of Co3+ in the layered perovskite manganite thin film
The photoinduced effect, at different temperatures, on layered perovskite manganite La1.2Sr1.8Mn1.8Co0.2O7 thin film deposited on a SrTiO3(100) substrate has been studied using a He–Ne laser (632.8 nm) with the power of output 25 mW at low temperatures. The electrical transport and magnetic properties of the film are investigated systematically in the temperature region from 20 to 300 K. The resistance shows a significant decrease at low temperatures (T<90 K) under laser irradiation, which can be interpreted in terms of the spin-state transition of Co3+ ions. The magnetic field combined with the laser is also used to detect the photoinduced effect of the spin-glass state. The time dependence of the metastable system under several applied fields was also discussed. The system has the ability to keep a persistent memory of the magnetic history imprinted in its zero-field resistance.