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Age changes in conduction velocity, refractory period, number of fibers, connective tissue space and blood vessels in sciatic nerve of rats. Morphometric analysis of the effects of exenteration and enucleation of the development of third and sixth cranial nerves in the rat. Decrease in number of myelinated fibers in human roots with age. A determination of the number of nerve fibers in the eighth thoracic and the largest lumbar ventral roots of the albino rat. Quantitative studies on the maturation of ventral and peripheral parts of individual ventral motoneuron axons. Relation between the number of Myelin lameliae and axon circunference in fibers of vagus and sciatic nerves of mice. Postnatal differentiation of the rat troclear nerve.
There are four conventionally accepted fundamental interactions—gravitational, electromagnetic, strong nuclear, and weak nuclear. Each one is described mathematically as a field.
The gravitational force is modelled as a continuous classical field. The other three, part of the Standard Model of particle physics, are described as discrete quantum fields, and their interactions are each carried by a quantum, an elementary particle.
In his 1. Inferring that all objects bearing mass approach at a constant rate, but collide by impact proportional to their masses, Newton inferred that matter exhibits an attractive force.
His law of universal gravitation mathematically stated it to span the entire universe instantly despite absolute time , or, if not actually a force, to be instant interaction among all objects despite absolute space. As conventionally interpreted, Newtons theory of motion modelled a central force without a communicating medium. Thus Newtons theory violated the first principle of mechanical philosophy, as stated by Descartes, No action at a distance.
Conversely, during the 1. Michael Faraday inferred a field filling space and transmitting that force. Faraday conjectured that ultimately, all forces unified into one.
In the early 1. James Clerk Maxwell unified electricity and magnetism as effects of an electromagnetic field whose third consequence was light, travelling at constant speed in a vacuum. The electromagnetic field theory contradicted predictions of Newtons theory of motion, unless physical states of the luminiferous aether—presumed to fill all space whether within matter or in a vacuum and to manifest the electromagnetic field—aligned all phenomena and thereby held valid the Newtonian principle relativity or invariance.
The exchange of bosons always carries energy and momentum between the fermions, thereby changing their speed and direction. The exchange may also transport a charge between the fermions, changing the charges of the fermions in the process e. Since bosons carry one unit of angular momentum, the fermions spin direction will flip from Plancks constant.
Because an interaction results in fermions attracting and repelling each other, an older term for interaction is force. According to the present understanding, there are four fundamental interactions or forces: gravitation, electromagnetism, the weak interaction, and the strong interaction.
Their magnitude and behaviour vary greatly, as described in the table below. Modern physics attempts to explain every observed physical phenomenon by these fundamental interactions. Moreover, reducing the number of different interaction types is seen as desirable.
Two cases in point are the unification of. Electric and magnetic force into electromagnetism. Share full text access. Please review our Terms and Conditions of Use and check box below to share full-text version of article.
Citing Literature Number of times cited according to CrossRef: Oiki, T. Nishida, N.
Ichihara, H. Nakajima, H. Amasaki and M. Wiley Online Library. Volume , Issue 4 August Pages Related Information. Email or Customer ID. Forgot password?
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