Fiber propagation

An action potential in the presynaptic fiber propagates into the synaptic terminal and activates voltage-sensitive calcium... 

An action potential in the presynaptic fiber propagates into the synaptic terminal and activates voltage-sensitive calcium channels in the membrane of the terminal (Figure 6-3). The calcium channels responsible for the release of transmitter are generally resistant to the calcium channelblocking agents discussed in Chapter 12 Vasodilators the Treatment of Angina Pectoris (verapamil, etc) but are sensitive to blockade by certain marine toxins and metal ions (Tables 12-4 and 21-1). Calcium flows into the terminal, and the increase in intraterminal calcium concentration promotes the fusion of synaptic vesicles with the presynaptic membrane. The transmitter contained in the vesicles is released into the synaptic cleft and diffuses to the receptors on the postsynaptic... 

Denoting by a(, 1), the fiber propagation loss at a fixed value of a measurand, light intensity at the fiber output can be written as ... 

Figure 6. a Photograph of the air column surrounding an optical fiber propagating toward the end of a conical die. b Photograph of the air column penetrating through the end of the die. At this point no liquid is applied to the fiber. 

A.3 How Can a Natural Protein in a P-sheet-containing Amyloid Fiber Function as a Seed Crystal to Induce Fiber Propagation That Is Ultimately Injurious to the Host Site ... 

Propensity of Prion Protein for Fiber Propagation Correlation with the Consilient Mechanism... 

Specialized fibers propagate electrical impulses throughout the heart s cells, causing the heart to contract. This illustration shows the elements of the cardiac conduction system. 

Agrawal G P 1989 Ultrashort pulse propagation in nonlinear dispersive fibers The Supercontinuum... 

Mollenauer L F, Gordon J P and Islam M N 1986 Soliton propagation in long fibers with periodically compensated loss IEEE J. Quantum. Electron. 22 157-73... 

Coating Theory. This theory includes fire retardants which form an impervious skin on the fiber surface. This coating may be formed during normal chemical finishing, or subsequently when the fire retardant and substrate are heated. It excludes the air necessary for flame propagation and traps any tarry volatiles produced during pyrolysis of the substrate. Examples of this type of agent include the easily fusible salts such as carbonates or borates. 

Thermoplastic Fibers. The thermoplastic fibers, eg, polyester and nylon, are considered less flammable than natural fibers. They possess a relatively low melting point furthermore, the melt drips rather than remaining to propagate the flame when the source of ignition is removed. Most common synthetic fibers have low melting points. Reported values for polyester and nylon are 255—290°C and 210—260°C, respectively. 

Under some citcumstances the crack tip stress intensity is different than far-field stresses would indicate because of microstmctural effects behind the crack tip, such as fibers, whiskers, and bridging grains. Often far-field values indicate the crack is propagating at a stress intensity value higher than Kj and this apparent value usually increases as crack length increases. In spite of indications to the contrary, bonds continue to break at the same value of the stress intensity however, the crack tip is being shielded from some of the appHed stress intensity. To minimize confusion about Kj it has been suggested that the farfield value of the stress intensity be called When there are no microstmctural features that effectively reduce the crack tip stress intensity,... 

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