barrier

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barrier

 [bar´e-er]
1. an obstruction.
2. a partition between two fluid compartments in the body.
3. a covering used to prevent contact with body fluids.
alveolar-capillary barrier (alveolocapillary barrier) see under membrane.
blood-air barrier alveolocapillary membrane.
blood-aqueous barrier the physiologic mechanism that prevents exchange of materials between the chambers of the eye and the blood.
blood-brain barrier see blood-brain barrier.
blood-gas barrier alveolocapillary membrane.
blood-testis barrier a barrier separating the blood from the seminiferous tubules, consisting of special junctional complexes between adjacent Sertoli cells near the base of the seminiferous epithelium.
barrier methods contraceptive methods such as condoms and diaphragms in which a plastic or rubber barrier blocks passage of spermatozoa through the vagina or cervix. See discussion under contraception.
placental barrier the tissue layers of the placenta which regulate the exchange of substances between the fetal and maternal circulation.

bar·ri·er

(bar'ē-er),
1. An obstacle or impediment.
2. In psychiatry, a conflictual agent that blocks behavior that could help resolve a personal struggle.
3. In psychotherapy, anything that acts as an impediment to the insight, constructive change, healing, and growth of a patient (for example, an unhealthy or primitive defense mechanism; secondary gain; conflicted ambivalence; unconscious motivation derived from residual conflict from an earlier developmental stage; stubbornness; lack of ability to detach, observe, or analyze).
[M.E., fr. O.Fr. barriere, fr. L.L. barraria]

barrier

(băr′ē-ər)
n.
1. Physiology A membrane, tissue, or mechanism that blocks the passage of certain substances.
2. Ecology A physical or biological factor that limits the migration, interbreeding, or free movement of individuals or populations.

barrier

Physiology
A physical or functional hurdle which a substance or cell must surmount or circumvent to have free access to a tissue or site in the body.

Social medicine
An impediment in access to a service or activity, defined in the context of the Americans with Disabilities Act (ADA), which may be architectural (e.g., requiring widened doors, wheelchair ramps and others) or communication-related (e.g., linguistic barrier, vision defects).

According to the ADA, the existance of barriers may require an employer to make reasonable accomodations in the form of obtaining an interpreter or braille forms (e.g., for paperwork), or by altering the physical layout of an office or work space.

barrier

Physiology A physical or functional hurdle which a substance or cell must surmount or circumvent to have free access to a tissue or site in the body. See Blood-brain barrier, Bone marrow barrier Social medicine An impediment in access to a service or activity, defined in the context of the Americans with Disabilities Act–ADA, which may be architectural–eg requiring widened doors, wheelchair ramps, and others or communication-related–eg linguistic barrier, vision defects. See Americans with Disabilities Act, Architectural barrier, Cultural barrier, Disability, Inequitable barrier, Reasonable accommodations.

bar·ri·er

(bar'ē-ĕr)
1. An obstacle or impediment.
2. psychiatry A conflictual agent that blocks behavior that could help resolve a personal struggle.
[M.E., fr. O. Fr. barriere, fr. L.L. barraria]

bar·ri·er

(bar'ē-ĕr)
An obstacle or impediment.
[M.E., fr. O. Fr. barriere, fr. L.L. barraria]
References in periodicals archive ?
exports resulting from removing any foreign trade barrier identified in the comment, as well as a description of the methodology the commenter used to derive the estimate, USTR said.
[USPRwire, Thu Aug 15 2019] The automatic barriers market is expected to remain under the influence of growing urbanization, increasing demand for security and reliance on the automation technologies in the parking systems.
[ClickPress, Fri Aug 16 2019] With the growing emphasis on the safety and security in the private and public infrastructures, the Automatic Barriers and Bollards Market is expected to witness a steady growth during the forecast period.
Crossing barriers also generally require a deeper solids channel in order to achieve output equal to that of a parallel barrier because of the previously mentioned pumping limitation.
The Floodblock barriers, which are lightweight and reusable, are made with one layer of weave-patterned polypropylene for strength and one layer of polyethylene for water tightness.
Police removed barriers from at least eight places inside Peshawar cantonment area to ensure smooth flow of traffic.
As the leading supplier of new and used concrete barriers in Kansas City, 48 Barriers[TM] are able to deploy concrete barriers in a matter of hours, to ensure the site remains safe and protected.
Compared to house wraps and mechanically-fastened weather barriers, Wall Guardian FW-100A can be quickly applied to building material surfaces with a heavy-duty sprayer, roller or brush.
Coatings and coextrusions are entering the market to increase chemical resistance, and oxygen and moisture barriers for medical device packaging.
Barriers to insulin therapy are a major challenge to optimal practice of primary care diabetes.
This paper explores the evolution of export barriers along the firm's internationalization process.
According to actual condition, the model of nine plug-in sound barriers and one expansion joint is simulated using the finite element method.