Abstract: Embodiments of this application disclose a cell measurement method and a related apparatus. The method includes: A first access network device sends first measurement control information to a terminal device through a first serving cell. The first measurement control information indicates the terminal device to measure quality of a downlink reference signal of a virtual cell. A center frequency of a downlink reference signal of the first serving cell is the same as a center frequency of the downlink reference signal of the virtual cell, a frequency range of the virtual cell is included in a frequency range of a second serving cell, and the frequency range of the second serving cell overlaps with a frequency range of the first serving cell. The first access network device receives a first measurement report from the terminal device, where the first measurement report indicates the quality of the downlink reference signal of the virtual cell.

Abstract: Provided in the present invention is an asparaginic acid kinase, and the 340th amino acid residue in the position of the amino acid sequence of the asparaginic acid kinase corresponding to the amino acid sequence shown in SEQ ID NO: 2 is a non-aspartic acid. The asparaginic acid of the present invention can efficiently relieve the feedback inhibition of L-lysine, and can be effectively used for the production of L-lysine. Also provided in the present invention are host cells comprising genes coding the asparaginic acid kinase and a method for producing L-lysine using the host cells or the asparaginic acid kinase. The asparaginic acid kinase of the present invention or the host cells comprising the asparaginic acid kinase of the present invention is also used to produce L-threonine, L-methionine, L-isoleucine or L-valine. Also provided in the present invention is a method of producing L-aspartyl-4-yl phosphoric acid using the asparaginic acid kinase or the host cells.

Abstract: Provided in the present invention is an asparaginic acid kinase, and the 340th amino acid residue in the position of the amino acid sequence of the asparaginic acid kinase corresponding to the amino acid sequence shown in SEQ ID NO: 2 is a non-aspartic acid. The asparaginic acid of the present invention can efficiently relieve the feedback inhibition of L-lysine, and can be effectively used for the production of L-lysine. Also provided in the present invention are host cells comprising genes coding the asparaginic acid kinase and a method for producing L-lysine using the host cells or the asparaginic acid kinase. The asparaginic acid kinase of the present invention or the host cells comprising the asparaginic acid kinase of the present invention is also used to produce L-threonine, L-methionine, L-isoleucine or L-valine. Also provided in the present invention is a method of producing L-aspartyl-4-yl phosphoric acid using the asparaginic acid kinase or the host cells.