mechanical transmission

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

mechanical transmission

The passive transfer of causative agents of disease, esp. by arthropods. This may be indirect, as when flies pick up organisms from excreta of humans or animals and deposit them on food, or direct, as when they pick up organisms from the body of a diseased individual and directly inoculate them into the body of another individual by bites or through open sores.
See: vector
See also: transmission


1. transfer, as of an infection from one patient to another.
2. of nervous impulses. See neuromuscular transmission.
3. heredity.

airborne transmission
spread of infection by droplet nuclei or dust through the air. Without the intervention of winds or drafts the distance over which airborne infection takes place is short, say 10 to 20 feet.
arthropod transmission
by insect, either mechanically via a contaminated proboscis or feet, or biologically when there is growth or replication of the organism in the arthropod. See also trans-stadial.
biological transmission
involving a biological process, e.g. passing a stage of development of the infecting agent in an intermediate host. Opposite to mechanical transmission.
colostral transmission
a form of vertical transmission via successive generations.
contact transmission
the disease agent is transferred directly by biting, sucking, chewing or indirectly by inhalation of droplets, drinking of contaminated water, traveling in contaminated vehicles.
cyclopropagative transmission
the agent undergoes both development and multiplication in the transmitting vehicle.
developmental transmission
the agent undergoes some development in the transmission vehicle.
fecal-oral transmission
the infectious agent is shed by the infected host in feces and acquired by the susceptible host through ingestion of contamined material.
horizontal transmission
lateral spread to others in the same group and at the same time; spread to contemporaries.
mechanical transmission
the transmitter is not infected in that tissues are not invaded and the agent does not multiply.
propagative transmission
the agent multiplies in the transmission vehicle.
vector transmission
see vector.
vertical transmission
from one generation to the next, perhaps transovarially or by intrauterine infection of the fetus. Some retroviruses are transmitted in the germ line, i.e. their genetic material is integrated into the DNA of either the ovum or sperm.
References in periodicals archive ?
The IEK predicts exports for mechanical transmission devices, mainly ball screws, gears and bearings, will reach NT$43.
Mechanisms, mechanical transmissions and robotics; proceedings.
7 Conveyors, Automation Equipment 11,202 9,089 11 Mechanical Transmission Devices 8,026 7,993 19.
The biology and ecology of synanthropic flies indicate that their potential for mechanical transmission of C.
The driving torque M is realized through a mechanical transmission from the engine.
Education researchers and front-line teachers in a number of disciplines explain how the constructivist theory about knowledge and learning can suggest and inform an approach to instruction that is radically different from the models based on mechanical transmission of knowledge and hierarchy that are used in most schools now.
Gear, transmission and drive parts refer to mechanical transmission device like basic parts and articulated chain used to transmit power, achieve mechanical conveying and hoist heavy objects.
Eaton asserted that the FreedomLine heavy duty automated mechanical transmission infringed eleven different Eaton patents.
The experimental determination of power losses specific to the mechanical transmission of an actuator has shown its dependence according to the degree of loading and functioning regime.
It powers the rotor, not by mechanical transmission from the engine, but by means of small tipjets on each blade that are typically shutdown in forward flight when the aircraft operates as a gyroplane in autorotation.
A traditional mechanical transmission is not needed, because the variable speed electric motors serve the function of a continuously variable transmission.
I-SAM works together with, an automatic, converted mechanical transmission, which was developed within the Volvo Group, an electronic control unit as well as conventional diesel engine and batteries that are charged by braking energy.