air cell

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air cell

An air-filled sinus cavity in a bone.
See also: cell


the gaseous mixture that makes up the atmosphere. See also air sacs.

air capillaries
the minuscule vessels that connect the parabronchi in avian lungs, in which there are no blind-ended tubules.
air cell
the air-filled space between the internal and external shell membranes of a bird's egg.
air changes per hour
the standard measurements used to indicate the level of ventilation in a building especially with respect to removal of humidity, noxious gases and carbon dioxide.
air dried
said of feed that is dried in the open with only natural movement of air, e.g. conventional hay. Contains about 10% water.
air filtration
used as a means of reducing contamination inside a building, the efficiency depending on the pore size of the filter. A technique of some value when combined with temperature control in reducing the prevalence of pneumonia in calves in intensive veal producing units.
air flow rates
are important in assessing the suitability of a ventilating system in animal accommodation. Standards for suitable flow rates for different species and age groups for heating and cooling are available.
air gap technique
in radiography, a technique to reduce scatter of radiation by increasing the distance between the patient and the surface of the cassette.
air hunger
a distressing dyspnea affecting both inspiration and expiration which occurs in paroxysms; characteristic of diabetic acidosis and coma. Called also Kussmaul's respiration.
air movement
includes air changes voiding humidity and gases to the exterior plus movements within the space which facilitate cooling.
air passages
the combined air delivery system of the upper and lower respiratory tracts including nasal cavities, pharynx, laryngeal cavity, trachea, bronchi and bronchioles.
air pollution
contamination of the air with deleterious or esthetically unattractive chemical, physical or biological material. Usually reserved for pollutants generated by humans.
air pump
a small electrically driven appliance used to provide a constant stream of air bubbles to aquaria. The bubbles themselves add little oxygen to the water but the constant disturbance of the surface of the water does.
air quality
the determination of air flow rate, temperature, humidity, freedom from bacteria, solid particles, obnoxious effluvia and poisonous gases—especially hydrogen sulfide and methane from sullage pits under the animal accommodation.
air trapping
dilatation of alveoli without destruction of their walls.
air vesicles
extend radially from parabronchi in the lungs of birds and connect with air capillaries, in which gaseous exchange occurs with vascular capillaries.
References in periodicals archive ?
Zygomatic air cell defect (ZACD): Prevalence and characteristics in a dental clinic outpatient population.
a) In the diseased ear: 24 cases out of 50 (48%) had well pneumatized mastoid air cell system in the diseased ear as opposed to 26 cases (52%) that had poor pneumatization.
Elastic/VE foam had the largest stiffnesses and viscous fluid, air cell, and honeycomb were similar (p > 0.
The air cell is formed when the outer shell membrane separates from the inner shell membrane.
They maintained that creation of an aerated mastoid increases success in patients with poor tubal function and small mastoid air cell system.
According to the active-invasion theory, postnatally the antrum is the focal area for expansion of the air cell system into the mastoid process and adjacent areas.
In a study by Sethi et al, in the normal ear, 84% had well pneumatized mastoid air cell system and 16% had poor pneumatization on x-ray.
Tenders are invited for Procurement of air cell for 240mva gt at 2x600 sstpp, mppgcl, dongalia
The varying degree of pneumatisation of sphenoid air cell was also studied.
With respect to pneumatization, the findings of our study indicate that surgeons should be prepared to drill through an air cell in order to locate the SSC in roughly one-quarter of patients.
The body of the middle turbinate is integrated into the ethmoid air cell system.
When this plate becomes pneumatized by extension of the anterior (55%) or posterior (45%) ethmoidal air cells, the air cell created is referred to as concha bullosa (11) (Figures 1 and 2).