Also found in: Dictionary, Thesaurus, Legal, Encyclopedia, Wikipedia.

hearing loss of aging

Presbycusis Audiology The progressive loss of high pitch auditory discrimination seen in advanced age, affecting ±50% of those > age 75. See Hearing loss.
Hearing loss types
Conductive HL caused by damage to any mechanical components of the ear, eg accumulation of cerumen, disruption of tympanic membrane, fusion of one or more middle ear ossicles; conductive HLs may be amenable to surgery
Sensorineural HL due to a defect in the neural pathways, which may be at the level of the cochlea, auditory nerve, or in the cerebral cortex Etiology Infections–especially intrauterine, eg rubella, drug toxicity, eg aminoglycosides, and tumors, eg acoustic neuroma
Mixed HL due to a combination of mechanical and neural defects Etiology Down syndrome, cystic fibrosis, cerebral palsy


having the quality of readily conducting electric current.

conductive flooring
flooring or floor covering made specially conductive to electrical current, usually by the inclusion of copper wiring that is earthed externally.

conduction, conductive

conveyance of energy, as of heat, sound or electricity.

accessory tract atrioventricular conduction
permits a sinus impulse from the atria to ventricles to precede that carried by the normal atrioventricular conduction system. Arrhythmia results, the particular electrocardiographic characteristics depending on the pathway(s) involved. See also wolff-parkinson-white syndrome.
aerial conduction, air conduction
conduction of sound waves to the organ of hearing through the air.
conduction anesthesia
local anesthesia produced by the injection of an anesthetic agent close to a nerve in order to prevent transmission of nerve impulses along it.
bone conduction
conduction of sound waves to the inner ear through the bones of the skull.
conduction disorder
abnormalities in the conduction pathways of the heart.
James accessory conduction
conduction system
the system comprises the sinoatrial and atrioventricular nodes, atrioventricular bundle and Purkinje fibers.
Enlarge picture
Conduction system of the heart. By permission from Cunningham JG, Textbook of Veterinary Physiology, Saunders, 2002
conduction time
an indicator of a peripheral nerve's ability to carry an impulse; measured during electromyography. A nerve that has undergone Wallerian degeneration is unable to carry an impulse. Severe loss of myelin results in a prolonged conduction time.
References in periodicals archive ?
In the field of transparent conductive films various technology options, such as carbon nanotubes (CNTs), PEDT (Polyethylenedioxythiophene) and even metal mesh have been shown to be thermoformable.
Encapsulants & potting compounds is the second-largest application of conductive silicones.
Thermally conductive plastics are used in various end-use industries such as electrical & electronics, automotive, industrial, heathcare, aerospace, and others.
Some believed conductive inks provided a redundant connection which would act as security for defective vias, and that the presence of conductive particles in the ink added another layer of reliability and continuity in the event the copper plating in the via cracked or was otherwise compromised.
This report covers trends driving each segment and respective sub-segments and offers analysis and insights on the potential of the conductive carbon black market in specific regions.
Nanoclay was added in concentrations of 2-8 wt% to polyurethane coatings with 35 wt% NCF or nickel-coated graphite (the percolation threshold of these two fillers in conductive coating was 30 wt%).
According to Susan Eustis, the principal author of the study, The advantage of transparent conductive film is that a very thin layer of material as a coating on a surface can provide touch screen capability.
This is an exciting development for the field of Conductive Education (CE).
To obtain conductive compounds (101 - 10612/sq) there are two possibilities:
Second, the specific kinds of conductive coatings favored by several of the underlying electronics markets are shifting.
Am I better off using copper or conductive epoxy for my plane layers?
Eftekhari (chemistry, Ohio Institute of Technology) assembles 19 chapters that introduce the connected fields of nanotechnology and conductive polymers, beginning with chapters on conductive polymers and nanostructured conductive polymers and surface studies.