PORTAL

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Related to portal circulation: hepatic portal circulation

PORTAL

A trading platform operated by NASDAQ of closely-held companies and other companies for investment by extremely high net-worth individuals. This market is largely exempt from the requirements of the Sarbanes-Oxley Act. In 2007, the Portal Market required an individual to have a minimum net worth of $100 million to qualify to trade on it.

PORTAL

A NASD trading system for unregistered foreign and domestic securities.
References in periodicals archive ?
Pioneering studies by Garret Fitzgerald at the University of Pennsylvania and other scientists in the 80's have shown that a controlled release formulation of Aspirin at the correct release rate will result in sustained specific irreversible acetylation of platelets as they pass through the portal circulation.
Also, the absence of known active metabolite in the systemic circulation in humans explains both its higher efficacy in portal circulation and lower systemic toxicity.
Egg ingestion leads to release of the embryo into the duodenum of the intermediate host with penetration of the intestinal wall leading to spread via the portal circulation.