[Composition and Distribution of Antibiotics in Soils with Different Land Use Types in a Typical Peri-urban Area of the Yangtze River Delta].

Antibiotics have been widely used for agriculture, aquaculture, and livestock, as well as for human disease treatment, in recent decades. However, antibiotics cannot be completely absorbed, and most of them are excreted through urine and feces. A substantial part of the antibiotics enter soils through fertilization and irrigation.

[DNA topoisomerase and telomerase activity with relation to multi-drug resistance in leukemia--review].

The appearance of multi-drug resistance becomes a key to treat many malignancies, and also is an important factor in the failure of chemotherapy. Presently, the studies on multi-drug resistance mechanism, reversor and associated exterior experiments in vivo and in vitro from different points of view and levels show that multi-drug resistance is the result of common action in many factors. In recent years non-representative mechanism of multi-drug resistance becomes more and more significant.