Barrier

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Barrier

1. See: Trade barrier.

2. See: Barrier Option.
References in periodicals archive ?
Name of Method Type of Method Problems/Disadvantages of Use Male condom Physical barrier Oil-based lubricants Allergies Storage Female condom Physical barrier Bulky Requires practice Sponge Physical and Inserted prior to intercourse chemical barrier Allergies Reduced effectiveness after having a child Diaphragm Physical barrier Not used during menstruation Inserting properly May need to be refitted Implant Hormonal Some medications and supplements reduce effect IUD Hormonal Slip out of uterus Slight risk of infection Patch Hormonal Must be replaced when becomes loose or falls off Higher risk of blood clots Some medications and supplements reduce effectiveness Effectiveness reduced if weigh over 198 lbs.
Chemical barriers are among the most important factors limiting heavy metal migrations (Karol Reuben 2003; Zinkute 2002).
The innate immune system consists of physiological barriers such as the skin and mucosal membranes and associated immune cells, as well as chemical barriers, including body pH (acidity) and chemicals (such as lysozyme in tears).

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