1
|
|||
|
Glossary:A B C D E F G H I J K L M N O P Q R S T U V W X Y Zantibiosis A relationship between two species in which one species is actively harmed (as by the production of toxins by the harming species). antixenosis A resistance mechanism employed (usually by a plant) to deter or prevent pest colonisation. Proposed by Kogan and Ortman (1978) to replace Non-preference; intended to parallel Anti-biosis. bioassay An assay for the activity or potency of a substance that involves testing its activity on living material. carbamate (kärb-mt, kär-bmt) n. A salt or ester of carbamic acid, especially one used as an insecticide. efficacy Power or capacity to produce a desired effect; effectiveness. esterase
An enzyme that breaks ester linkages, especially the ones found in
nucleic acids (phosphodiester bonds) and lipids. or exuviae
The cast-off skins or coverings of various organisms, such as the shells
of crabs or the external coverings of the larvae and nymphs of insects. forceps An instrument resembling a pair of pincers or tongs, used for grasping, manipulating, or extracting, especially such an instrument used by a surgeon. insect growth regulator Chemical substance which disrupts the action of insect hormones that control moulting, development from pupa to adult and other processes (Watson, Moore & Ware, 1976). instar A stage of an insect or other arthropod between molts. Mosquitoes typically have four istars in the larval period. pipette A narrow, usually calibrated glass tube into which small amounts of liquid are suctioned for transfer or measurement. plasmids Any extrachromosomal hereditary determinant. Plasmids are self-replicating circular molecules of DNA that are found in a variety of bacterial, archaeal, fungal, algal, and plant species. pupae The nonfeeding stage between the larva and adult in the metamorphosis of holometabolous insects, during which the larva typically undergoes complete transformation within a protective cocoon or hardened case. pyrethroid any of various synthetic compounds that are related to the pyrethrins and resemble them in insecticidal properties vector An organism, often an insect or rodent, that carries disease. 2. Plasmids, viruses, or bacteria used to transport genes into a host cell. A gene is placed in the vector; the vector then "infects" the bacterium. vector resistance Resistance of a host plant to the vector of a virus. Three basic types of vector resistance are recognised, antibiosis, antixenosis and tolerance.
|
|
Go to Top |
| NCID Home | | CDC Home | Search | Health Topics A-Z | This page last reviewed July 3, 2001 Centers
for Disease Control and Prevention |