This paper discusses results of anatomic analogy and transmission line model for designing a sterile pulse duplication system for bioprostheses. By simulating physiological flow and pressure pulses as well as the inpu...This paper discusses results of anatomic analogy and transmission line model for designing a sterile pulse duplication system for bioprostheses. By simulating physiological flow and pressure pulses as well as the input impedance of the human arterial system Pulsatile function testing allows us to study the hydrodynamic performances and the leaflet action of each valve. This inspection enables us to identify and reject those valves exhibiting leaflet prolapse or lazy leaflet or others believed to contribute to Primary tissue failure. Consequently, the risk of valve complications is reduced展开更多
The c-ras and its product P21 have been shown to play an important role in the initiation and development of some malignancies. The activation of c-ras may be associated with two mechanisms: (ⅰ) a point mutation of t...The c-ras and its product P21 have been shown to play an important role in the initiation and development of some malignancies. The activation of c-ras may be associated with two mechanisms: (ⅰ) a point mutation of the codon at position 12 or 61 of the genome leading to a single amino acid alteration in the corresponding product P21; (ⅱ) enhanced expression of ras family encode proteins with展开更多
文摘This paper discusses results of anatomic analogy and transmission line model for designing a sterile pulse duplication system for bioprostheses. By simulating physiological flow and pressure pulses as well as the input impedance of the human arterial system Pulsatile function testing allows us to study the hydrodynamic performances and the leaflet action of each valve. This inspection enables us to identify and reject those valves exhibiting leaflet prolapse or lazy leaflet or others believed to contribute to Primary tissue failure. Consequently, the risk of valve complications is reduced
文摘The c-ras and its product P21 have been shown to play an important role in the initiation and development of some malignancies. The activation of c-ras may be associated with two mechanisms: (ⅰ) a point mutation of the codon at position 12 or 61 of the genome leading to a single amino acid alteration in the corresponding product P21; (ⅱ) enhanced expression of ras family encode proteins with
