They created the first double helix model of DNA in 1953. Photograph: ap.
他们在1953年构建了第一个DNA双螺旋结构。
The double helix-type hollow fiber film device of the utility model has the advantages of high mass transferring efficiency, large feed liquid handling capacity and simple preparation and the like.
本实用新型设计的双螺旋式中空纤维膜器，具有传质效率高，处理料液量大，制备简单等优点。
The utility model comprises a double helix filament body and filament pins integrally arranged on both ends of the filament body, the filament pins are respectively straight line filament pins.
本实用新型包括双螺旋灯丝主体和连体设置在主体两端的丝脚，所述两端的丝脚分别为直线型丝脚。
The utility model comprises a double helix filament body and filament pins integrally arranged on both ends of the filament body, the filament pins are respectively straight line filament pins.
本实用新型包括双螺旋灯丝主体和连体设置在主体两端的丝脚，所述两端的丝脚分别为直线型丝脚。
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