carrier

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carrier

1. a mechanism by which something is carried or moved, such as a device for transmitting rotation from the faceplate of a lathe to the workpiece
2. Pathol another name for vector
3. Pathol a person or animal that, without having any symptoms of a disease, is capable of transmitting it to others
4. Physics an electron, ion, or hole that carries the charge in a conductor or semiconductor
5. short for carrier wave
6. Chem
a. the inert solid on which a dyestuff is adsorbed in forming a lake
b. a substance, such as kieselguhr or asbestos, used to support a catalyst
c. an inactive substance containing a radioisotope used in radioactive tracing
d. an inert gas used to transport the sample through a gas-chromatography column
e. a catalyst that effects the transfer of an atom or group from one molecule to another
7. a breed of domestic fancy pigeon having a large walnut-shaped wattle over the beak; a distinct variety of pigeon from the homing or carrier pigeon
8. a US name for roof rack

carrier

[′kar·ē·ər]
(chemistry)
A substance that, when associated with a trace of another substance, will carry the trace with it through a chemical or physical process.
(communications)
The radio wave produced by a transmitter when there is no modulating signal, or any other wave, recurring series of pulses, or direct current capable of being modulated. Also known as carrier wave; signal carrier.
A wave generated locally at a receiver that, when combined with the sidebands of a suppressed-carrier transmission in a suitable detector, produces the modulating wave.
(genetics)
An individual who is heterozygous for a recessive gene.
(immunology)
A protein to which a hapten becomes attached, thereby rendering the hapten immunogenic.
(mechanical engineering)
Any machine for transporting materials or people.
(medicine)
A person who harbors and eliminates an infectious agent and so transmits it to others, but who may not show signs of the disease.
(naval architecture)

Carrier

A periodic waveform upon which an information-bearing signal is impressed. This process is known as modulation and comprises a variety of forms such as amplitude, phase, and frequency modulation. The most common type of carrier is the sinusoidal carrier, but any periodic waveform followed by a band-pass filter can serve as a carrier.

carrier

1. A mobile prime mover for transporting construction machines; also may serve as the working base or undercarriage of the machine.
2. A container attached to or hung from a trolley for moving a load from one point to another on a construction site.
3. A carrier angle or carrier bar which supports treads formed from metal grating.

carrier

(1) An organization that provides communications and networking services. See common carrier, private carrier and MVNO.

(2) A waveform that has a fixed center frequency. It is used to contain data and establish a unique channel that can be identified independently of other channels. Carriers are the primary method used to send wireless signals over the air in order to differentiate between transmitting stations. For example, AM and FM radio, TV, satellite and Wi-Fi all use carriers. In fact, AM and FM radio actually use the carrier frequency as their station's channel number.

Multiple Carriers - Multiple Data Streams
Carriers are also used to transmit multiple channels simultaneously within a wire or fiber. For example, several voice, data and video signals can travel over the same line, each residing in its own carrier vibrating at a different frequency. See definition #2 in broadband.

Multiple Carriers - One Data Stream
Instead of sending a separate stream of data in each carrier, multiple carriers can be used for only one channel of data. For example, the widely used orthogonal frequency division multiplexing (OFDM) method uses numerous subcarriers for only one transmitting channel and one stream of data (see OFDM). See modulation and subcarrier.


Carrier Signal
The radio station transmits audio in a carrier, which is altered (modulated) with the analog signal. The receiving tuner latches onto the carrier's center frequency and isolates the audio, which is sent to the amplifier. The amplifier boosts the signal and sends it to the speakers. Carriers are also used to transmit digital data (see modulation).
References in periodicals archive ?
Carrier detection and prenatal diagnosis in Duchenne and Becker muscular dystrophy families, using dinucleotide repeat polymorphisms.
Osmetech has launched eSensor(R), an FDA-cleared electrochemistry-based array system, for Cystic fibrosis carrier detection, and will launch a number of pharmacogenomic assays utilizing its proprietary technology in the near future.
Osmetech has rights to a strong portfolio of over 200 issued and pending patents and has launched its first generation eSensor 4800 platform, an electrochemistry-based array system, together with an FDA cleared in vitro diagnostic test for Cystic Fibrosis carrier detection.
Therefore carrier detection for other family members and prenatal diagnosis for subsequent pregnancies is not possible for these families using previous cystic fibrosis testing.
Prenatal diagnosis and carrier detection of Duchenne muscular dystrophy by restriction fragment length polymorphism analysis with pERT 87 deoxyribonucleic acid probes.
Osmetech has launched eSensor[R], an FDA cleared electrochemistry-based array system, for Cystic fibrosis carrier detection and will launch a number of pharmacogenomic assays utilizing our proprietary technology in the near future.
Five different catagories of clinical molecular genetic testing are defined (differential diagnosis, carrier detection within families and within populations, prenatal diagnosis, and presymptomatic screening) along with frank discussions of other important issues such as laboratory staffing, training, quality assurance, accreditation, and even audits.