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Reconstruction of a Roman peristyle surrounding a courtyard in Pompeii, Italy. In ancient Greek [1] and Roman architecture, [2] a peristyle (/ ˈ p ɛr ɪ ˌ s t aɪ l /; Ancient Greek: περίστυλον, romanized: perístulon) [3] [4] is a continuous porch formed by a row of columns surrounding the perimeter of a building or a courtyard.
A simplified image showing peristalsis. In the esophagus, two types of peristalsis occur: First, there is a primary peristaltic wave, which occurs when the bolus enters the esophagus during swallowing. The primary peristaltic wave forces the bolus down the esophagus and into the stomach in a wave lasting about 8–9 seconds.
Nutcracker esophagus is characterized as a motility disorder of the esophagus, meaning that it is caused by abnormal movement, or peristalsis of the esophagus. [2] People with motility disorders present with two main symptoms: chest pain or difficulty with swallowing. Chest pain is the more common.
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Retroperistalsis is the reverse of the involuntary smooth muscle contractions of peristalsis.It usually occurs as a precursor to vomiting.Local irritation of the stomach, such as bacteria or food poisoning, activates the emetic center of the brain which in turn signals an imminent vomiting reflex.
The best Spanish barilla—prepared by master barrilleros—contained about 30% Na 2 CO 3. In 1877 Kingzett described the importance of the barilla trade to Spain as follows: "So highly was the product valued, and the importance of the trade regarded, that by the laws of Spain the exportation of the seed was an offence punishable by death."