Abstract: The technology of this application relates to a user data management method and a related device, to improve user information security. The method in embodiments of this application includes a data request device sends a first request to a blockchain platform, where the first request indicates that the data request device needs to access a data storage device. The data request device receives first permission information sent by the blockchain platform, where the first permission information indicates whether the data request device has permission to access the data storage device. If the first permission information indicates that the data request device has the permission to access the data storage device, the data request device sends a second request to the data storage device, where the second request includes an access address.

Abstract: Embodiments of this application provide a user data management method and a related device, to improve user data security. The method includes: A data request device sends a first request to a blockchain platform, where the first request indicates that the data request device needs to access a data storage device. The data request device receives first permission information sent by the blockchain platform, where the first permission information indicates whether the data request device has permission to access the data storage device, and the permission is related to signature information of the data request device, an access type, and an operator public key; and sends a second request to the data storage device if the first permission information indicates that the data request device has the permission to access the data storage device, where the second request includes an access address and an operator private key signature.

Abstract: A T cell antigen receptor, an immune cell for expressing the T cell antigen receptor (TCR) and a preparation method and use thereof. The TCR disclosed in the present invention can be specifically activated by virus antigen peptide presenting cells, so that the release level of extracellular cytokines IFN? and IL2 and the release amount of lactate dehydrogenase are improved, and target cells are significantly killed.

Abstract: Provided is an antibody or an antigen-binding fragment thereof, a T cell antigen receptor, an immune cell expressing the T cell antigen receptor (TCR), and a preparation method therefor and the use thereof. The TCR can specifically recognize corresponding pMHC complexes, activate TCR T cells, and produce high-level cytokines IFN?, IL2, TNF?, significantly kill target cells and prolong the life of tumor-bearing mice.

Abstract: The TaNAC2 gene can promote uptake and utilization of nitrogen in a plant. A method for improving the uptake, transport and/or assimilation of nitrogen element in the plant includes: introducing a gene encoding a protein represented by SEQ ID NO:4 into a primary plant to obtain a transgenic plant. Compared to the primary plant, the uptake, transport and/or assimilation of the nitrogen element in the transgenic plant are improved. The method provides advantages in that: the TaNAC2 gene, as a nitrate nitrogen responsive regulatory factor, which can regulate the expression of a series of genes in nitrogen element uptake pathways of wheat, greatly promotes the study of the metabolism and utilization of the nitrogen element in a plant; and it is possible to improve the assimilation efficiency of nitrogen element by increasing the expression of TaNAC2, thereby reducing fertilizer application and increasing yield.