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Edwardsiella tarda EIB202, a Gram-negative pathogen with strong virulence, is an opportunistic pathogen capable of causing edwardsiellosis with high mortality to fish. Alternative sigma factor 54 (RpoN) is an important regulator of virulence and stress resistance genes in many bacterial species and mainly responsible for transcription of genes in nitrogen(More)
Edwardsiella tarda the etiological agent for edwardsiellosis, a devastating fish disease prevailing in worldwide aquaculture industries was subjected to a molecular genetic study. To research into the influence when RpoN (σ(54) ) and RpoS (σ(38) ) were deleted simultaneously, the double deletion mutant of RpoN (σ(54) ) and RpoS (σ(38) ), namely rnrs, was(More)
Sigma factors are important regulators that bacteria employ to cope with environmental changes. Studies on the functions of sigma factors have uncovered their roles in many important cellular activities, such as growth, stress tolerance, motility, biofilm formation, and virulence. However, comparative analyses of sigma factors that examine their common and(More)
Polychromatic sets theory is used for box parts CAPP expert system so as to store knowledge rules of selecting machining method in the form of contour matrix. The rules can be adopted to provide a new way to build process knowledge base. Through the logic operation of coloring in the knowledge base, the machining schemes relating to their features can be(More)
Mechanical product design is one of typical fields which strongly depend on past experience, and its domain knowledge constitution is complex. Oriented to industrial application and product design process, driving serial design of mechanical product by domain knowledge can make the designers release from the onerous repeated work. According to(More)
— Map retrieval, the problem of similarity search over a large collection of 2D pointset maps previously built by mobile robots, is crucial for autonomous navigation in indoor and outdoor environments. Bag-of-words (BoW) methods constitute a popular approach to map retrieval; however, these methods have extremely limited descriptive ability because they(More)
The application of CAD and artificial intelligence technology, which adopts reasonable CBR realization mode, meets industry practice and design habit of designer, and can support product design process effectively, and is a very practical realization way of automotive and rapid design of series product. It is a very important research of CAD and artificial(More)
Map retrieval, the problem of similarity search among a large collection of 2D pointset maps previously built by mobile robots, is crucial for autonomous navigation in both indoor and outdoor environments. Unlike previous Bag-of-words scene model which lacks spatial layout information, we exploit a holistic local map descriptor which is view-independent and(More)
An approach to the solution of sequencing machining step on a machining center is proposed. Constraints model is established based on polychromatic sets theory and it is combined with a Genetic Algorithm to a sequence machining step on a machining center. In the model part contour matrix is used to formalize the conditioned restrictions visually and(More)