Along with the development of modern biological technology, the adversity of the transgenic products has aroused increasing attention. The origin of biosafety issues, the safety of genetically modified organisms and its impact on the ecological environment and human health were introduced in this paper. Here, the safety issues of the leakage of laboratory recombinant gene fragments were discussed also, finally, the focuses on biosafety and preventive measures were reviewed.

AIM To investigate the pathways of Ca 2+ entry into ECV304 endothelial cell and the effect of angiotensin Ⅱ(AⅡ) on calcium activated non setective cation channel(CAN). METHODS The cell attachment and whole cell configurations of patch clamp technique were used to record channel activity. RESULTS (1) The single channel conductance is ? o=(12 90?2 11) pS( n =4) for Ca 2+ passing through CAN of ECV304 cell in condition of pipette solution without K + and Na + but composed 120 mmol?L -1 CaCl 2. The channel current amplitude and open time can be enhanced by 1?10 -7 mol?L -1 AⅡ. The enhanced conductance in CAN is ? 1=(22 18?2 29) pS( n =4). The results of whole cell recording are identified with single channel recording. (2) The whole cell configuration was carried out for recording voltage dependent Ca 2+ channel in ECV304 cell. The peak current amplitude was (29 32?3 56) pA( n =4). This current was inhibited to (6 00?3 94) pA( n =4) by nifedipine and activated by BayK8644. CONCLUSIONS (1)Ca 2+ enters ECV304 cell via Ca 2+ activated non selective cation channel and voltage dependent L type calcium channel. (2) AⅡ can significantly enhance the calcium entry via CAN in ECV304 cell.

OBJECTIVETo investigate the distribution and host plants of Cynomorium songaricum, and provide a scientific basis for the artificial cultivation of C. songaricum and protect the ecological environment in the sandy area.

METHODSpecimens of C. songaricum in growing area was collected and accessed according to relevant literature and identified.

RESULTThe results showed that a new host plant of C. songaricum-Peganum multisectum was found.

CONCLUSIONA new host plant of C. songaricum, Peganum multisectum was reported, and it is provide the necessary nutrition for normal growth of C. songaricum.

China ; Cynomorium ; anatomy & histology ; physiology ; Ecosystem ; Peganum ; anatomy & histology ; physiology