lower esophageal contraction ring - significado y definición. Qué es lower esophageal contraction ring
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Qué (quién) es lower esophageal contraction ring - definición

CHEMICAL PHENOMENON WITHIN RING SYSTEMS
Ring contraction reaction; Ring expansion reaction; Ring contraction; Ring expansion; Ring expansion and ring contraction
  • The bond migration steps in the Baeyer-Villiger oxidation (A) and the Beckmann rearrangement (B).
  • A generalized mechanism of the Buchner ring expansion.
  • A generalized mechanism of the Favorskii rearrangement to give a ring contracted product. Note that anion formation has been omitted.
  • alt=
  • The bond migration step of the pinacol type rearrangement.
  • A general pinacol type rearrangement to an unequal 5,7 ring system.
  • Ring contraction through anionic (A), cationic (B), and carbenoid (C) reactive intermediates.
  • A scheme showing ring expansion by exocyclic bond migration (A) and ring opening of a bicyclic molecule (B).

Schatzki ring         
  • Schatzki B ring at barium swallow.
CONGENITAL DISORDER OF DIGESTIVE SYSTEM
Schatzki's ring; Schatzki's Ring; Schatzki rings; Schatzki-Gary ring; Schatzki–Gary ring; Shatzki ring
A Schatzki ring or Schatzki–Gary ring is a narrowing of the lower esophagus that can cause difficulty swallowing (dysphagia). The narrowing is caused by a ring of mucosal tissue (which lines the esophagus) or muscular tissue.
Esophageal stricture         
STRICTURE OF THE ESOPHAGUS
Oesophageal stricture; Esophageal stenosis; Esophageal narrowing; Esophagal stenosis; Peptic stricture
A benign esophageal stricture, or peptic stricture, is a narrowing or tightening of the esophagus that causes swallowing difficulties.
Length contraction         
  • Minkowski diagram of Einstein's 1911 [[thought experiment]] on length contraction. Two rods of rest length <math>A' B' = A'' B'' = L_0</math> are moving with 0.6c in opposite directions, resulting in <math>A^\ast B^\ast <L_0</math>.
  • Formula on a wall in Leiden, Netherlands. Lorentz was chair of theoretical physics at the [[University of Leiden]] 1877-1910
  • ''Length contraction'': Three blue rods are at rest in S, and three red rods in S'. At the instant when the left ends of A and D attain the same position on the axis of x, the lengths of the rods shall be compared. In S the simultaneous positions of the left side of A and the right side of C are more distant than those of D and F. While in S' the simultaneous positions of the left side of D and the right side of F are more distant than those of A and C.
  • In special relativity, the observer measures events against an infinite latticework of synchronized clocks.
  • Wheels which travel at 9/10 the speed of light.  The speed of the top of a wheel is 0.994 c while the speed of the bottom is always zero. This is why the top is contracted relative to the bottom.
  • Cuboids in Euclidean and Minkowski spacetime
THE CONTRACTION OF LENGTH IN THE DIRECTION OF PROPAGATION
Lorentz–FitzGerald contraction hypothesis; Lorentz contraction; Fitzgerald–Lorentz contraction; FitzGerald–Lorentz Contraction; FitzGerald Lorentz Contraction; Lorentz-Fitzgerald Contraction; Lorentz Contraction; Lorentz-Fitzgerald contraction hypothesis; Lorentz-Fitzgerald contraction; Fitzgerald contraction; FitzGerald-Lorentz contraction; Lorentz-FitzGerald Contraction; Space contraction; Relativistic length contraction; Lorentz-FitzGerald contraction hypothesis; Fitzgerald-Lorentz contraction; FitzGerald-Lorentz Contraction; Lorenz contraction; Lorentz-FitzGerald contraction; FitzGerald contraction; Lorentz-FitzGeral contraction; Lorentz-FirtGerald contraction; Lorentz–Fitzgerald contraction; Lorentz–FitzGerald contraction; FitzGerald–Lorentz contraction; Fitz-Gerald contraction; Lorentz-Fitzgerald; Lorentz contraction hypothesis; Relativistic foreshortening
Length contraction is the phenomenon that a moving object's length is measured to be shorter than its proper length, which is the length as measured in the object's own rest frame. Extract of page 106 It is also known as Lorentz contraction or Lorentz–FitzGerald contraction (after Hendrik Lorentz and George Francis FitzGerald) and is usually only noticeable at a substantial fraction of the speed of light.

Wikipedia

Ring expansion and contraction

Ring expansion and ring contraction reactions expand or contract rings, usually in organic chemistry. The term usually refers to reactions involve making and breaking C-C bonds, Diverse mechanisms llead to these kinds of reactions.