5 results about "Natural selection" patented technology

This invention discloses a multi-unit composite stress tiered breeding device and method for juvenile large yellow croaker, belonging to the field of aquaculture breeding technology. The device uses a central control unit as its sole core, forming a fully integrated unidirectional closed-loop drive system. Four independent breeding units are connected through a transparent channel with a centrally located aeration head, forming a physical flow-limiting isolation structure. Each unit independently regulates water temperature, salinity, and dissolved oxygen, creating a multi-factor composite stress gradient. The breeding method employs a three-factor linear equal-gradient synergistic progressive setting, utilizing the juvenile fish's autonomous adaptation and avoidance instincts to achieve cross-unit migration and natural selection. Combined with contour recognition and dynamic tracking algorithms, it monitors the fish population status and mortality rate in real time, and identifies superior offspring with comprehensive stress resistance through secondary verification under extreme stress. This invention offers high screening accuracy and automation, increasing the survival rate of superior individuals by over 40%, reducing labor costs by over 60%, and allowing for flexible adjustment of device parameters. It can be extended to the stress resistance breeding of other marine economic fish species.

This invention discloses a salt-stress-tolerant Bacillus bellis and its applications. It relates to the field of agricultural microbiology. The salt-stress-tolerant Bacillus bellis ZY-2, with accession number CGMCC NO.34345, is described, along with its related applications. The salt-stress-tolerant Bacillus bellis provided by this invention has broad application prospects in resisting saline-alkali environments. Specifically, this strain can be used as the original material to breed strains with better tolerance to saline-alkali environments and more significant effects on promoting wheat growth and development through natural selection, artificial mutation breeding, and genetic engineering breeding, thereby reducing the use of chemical amendments. Furthermore, it exhibits strong tolerance to saline-alkali environments and demonstrates good promotion of wheat growth and development under salt stress.

The invention discloses a communication equipment repair spare part topological layout optimization method based on an SAGA, and the method employs a genetic algorithm to simulate the natural selection and genetic process, carries out the effective search in a large-scale solution space, improves the search breadth and quality of a solution, and deals with the challenge that the solution space is large and complex. The calculation bottleneck of an accurate solution method in a large-scale complex problem can be avoided, the quality of the solution can be continuously optimized through multi-generation iteration, and the solution requirement of the complex problem is met. In order to cope with the challenge that a plurality of locally optimal solutions may exist, a physical annealing process is simulated by using a simulated annealing-genetic algorithm, a poorer solution is allowed to be accepted at the initial stage, and the algorithm is gradually concentrated on a better solution as the temperature is gradually reduced, so that the trouble of the locally optimal solutions is effectively avoided; the bottleneck of a traditional accurate solution method in large-scale complex problems can be overcome, the search flexibility and robustness can be improved, and it is ensured that a solution close to global optimum is obtained.

The application provides a method for measuring the whole genome level nucleotide germline mutation rate of an animal of sexual reproduction. The method comprises the following steps: (1) performing genome sequencing on a to-be-tested species to obtain the sequences of all protein-coding genes of the to-be-tested species; (2) constructing a phylogenetic tree of the to-be-tested species; (3) obtaining the divergence time T between the to-be-tested species and a close relative species divergence ; (4) optimizing the phylogenetic tree of the to-be-tested species; (5) obtaining the annual germline mutation rate mu of the to-be-tested species year . The principle of the method is that neutral regions or neutral sites are widely distributed in the genome, and mutations at these positions are usually not affected by natural selection; by analyzing the variation frequency of these sites over time, the germline mutation rate can be calculated. The method described in the application is not only widely applicable to animal species of sexual reproduction that have obtained genome or transcriptome data, but also accurate and efficient, fills the gap in the prior art, and has important significance for theoretical research and practical application of biomedical engineering.

A five-axis cutter feeding and retracting method based on a genetic algorithm belongs to the technical field of numerical control machining and comprises the following steps: step 1, discretizing a workpiece space; defining a cutter as a cylinder, and segmenting a cutter path by using a linear sampling method; 2, gene coding processing, wherein the chromosome of each individual is coded into a path point sequence; 3, performing population initialization processing, randomly generating Group Size individuals, and calculating and selecting the Group Size individuals with relatively high fitness to form an initial population; 4, performing gene recombination treatment based on individual fitness; 5, performing gene mutation, namely performing mutation on individual genes according to a mutation probability; 6, natural selection is conducted, population individual fitness is ranked, and a population is reformed; and carrying out iterative solution on the step 4, the step 5 and the step 6. According to the scheme, tool retracting can be achieved at any position, the optimal tool retracting track is automatically selected, collision is prevented in the tool retracting process, and the tool retracting efficiency can be improved.