Abstract: Disclosed are a method and a system for optimizing data storage of query statistics of a graph database. The method includes: periodically scanning, on storage servers in which partitions are located, all edges in the partitions; determining, according to all the edges in the partitions, partitions to which start points and end points belong, and calculating outgoing-edge correlation and incoming-edge correlation between partitions; calculating relevancies between partitions through a preset correlation matrix weight according to the outgoing-edge correlation and the incoming-edge correlation between partitions; and storing partitions with high relevancies on a same storage server.

Abstract: Provided is a genome editing system and method for gene editing at least one target sequence in a cell genome. The genome editing system comprises: (1) an expression construct comprising a Cas12f nuclease; and (2) an expression DNA sequence comprising a guide RNA corresponding to the Cas12f nuclease, and an expression construct of the targeting sequence of the target sequence. The gene editing system or method can accurately knock out a target gene from within a cell; in addition, in an in vitro cutting experiment, the target gene can be accurately cut.

Abstract: A UUID generation method for a distributed graph database, and a data processing method and apparatus for the distributed graph database. The UUID generation method for the distributed graph database comprises the following steps: receiving a UUID generation request, wherein the UUID generation request comprises an input field and a partition number of the input field; calling a Murmur hash function to generate an initial UUID according to the input field and the partition number of the input field; querying whether a duplicate key value exists between the initial UUID and a historical UUID to obtain a query result; and obtaining a target UUID for storage according to the query result and the initial UUID.

Abstract: Disclosed are a method and a system for optimizing data storage of query statistics of a graph database. The method includes: periodically scanning, on storage servers in which partitions are located, all edges in the partitions; determining, according to all the edges in the partitions, partitions to which start points and end points belong, and calculating outgoing-edge correlation and incoming-edge correlation between partitions; calculating relevancies between partitions through a preset correlation matrix weight according to the outgoing-edge correlation and the incoming-edge correlation between partitions; and storing partitions with high relevancies on a same storage server.

Abstract: A UUID generation method for a distributed graph database, and a data processing method and apparatus for the distributed graph database. The UUID generation method for the distributed graph database comprises the following steps: receiving a UUID generation request, wherein the UUID generation request comprises an input field and a partition number of the input field; calling a Murmur hash function to generate an initial UUID according to the input field and the partition number of the input field; querying whether a duplicate key value exists between the initial UUID and a historical UUID to obtain a query result; and obtaining a target UUID for storage according to the query result and the initial UUID.

Abstract: A method for removing PPCPs in a drinking water treatment process, includes the following operations: introducing, by using a manner of bottom microporous aeration, a mixture gas of O2 and O3 in which a volume percentage of O3 is 5% to 10% to an ozone contact reaction column (1) in which a cathode (3) and an anode (2) are disposed at the bottom, and a direct current is applied to the cathode and the anode; while the mixture gas is being introduced, adding, to the ozone contact reaction column (1), PPCPs containing water to be treated, with a hydraulic retention time of 10 s to 40 min, and discharging the water in real time. Further disclosed is the use of the method for removing PPCPs in a drinking water treatment process in preparation of drinking water.