Schlumberger Technology Corporation

Shanghai Academy of Agricultural Sciences

Jianjie Gao

Jing Xu

Yu Ying Wang

Bo Wang

Edward Richards

Wenhui Zhang

Lijuan Wang

Xiaoyan Fu

Zhenjun Li

Hongjuan Han

Quanhong Yao

Fujian Zhang

Rihe Peng

Yongdong Deng

Yongsheng Tian

Autotrophic nitrogen fixation genes and an autotrophic nitrogenase expression cassette for plants and uses thereof are disclosed. Nitrogenase related genes of nitrogen fixation gene cluster fromsp. are specifically optimized by plant expression patterns through synthetic biology, to obtain autotrophic nitrogen fixation genes, which are then constructed into plant constitutive expression units. The expression units are assembled in a plant expression vector by isocaudarner cloning method and transformed into plants, thereby realizing autotrophic nitrogen fixation of the plants.

Autotrophic nitrogen fixation genes and an autotrophic nitrogenase expression cassette for plants and uses thereof

A technique facilitates communication of signals in a downhole environment. According to an embodiment, the system comprises an antenna which may be combined with a well component for communicating signals along a wellbore. The antenna comprises wire which is coated with a suitable material, such as amorphous polyetheretherketone (PEEK), and wet wound into a coil. A plurality of protective elements may be combined with the wire, e.g. sleeves may be placed over portions of the wire to protect the wire. Layers of tape also may be wrapped around coil to enhance durability of the antenna.

Antenna system for downhole tool

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Shanghai, China

Jianjie Gao