LC 50/Lethal Concentration
Median level concentration, a standard measure of toxicity. It tells how much of a substance is needed to kill half of a group of experimental organisms in a given time. (See LD 50.)
Source: Terms of the Environment ...
lethal dose (LD)
Amount of a substance or physical agent (e.g. radiation) that causes death when taken into the body.
lethal synthesis
Metabolic formation of a highly toxic compound often leading to death of affected cells.
Lethal Concentration 50: Also referred to as LC50, a concentration of a pollutant or effluent at which 50 percent of the test organisms die; a common measure of acute toxicity.
lethal concentration 50% (LC50) The concentration of a chemical in air or water which is expected to cause death in 50% of test animals living in that air or water; lethal concentration.
Lethal Dose (LD): amount of a substance required to cause death in an organism.
Loading: amount of a substance entering the environment (soil, water, or air).
Lethal Concentration (LC50): The concentration of a substance needed to kill half of a population at a specific time of observation.
Lethargy: A condition of abnormal drowsiness or torpor; a great lack of energy; apathy.
lethal. Deadly; fatal.
level controls. A float device (or pressure switch) which
senses changes in a measured variable and opens or closes a ...
Lethal dose low; the lowest dose in an animal study at which lethality occurs.
Leachate ...
Ldlo- Lethal dose low; the lowest dose in an animal study at which lethality occurs.
Absolute lethal concentration (LC100)-Lowest concentration of a substance in an environmental medium which kills 100% of test organisms or species under defined conditions. This value is dependent on the number of organisms used in its assessment.
Median Lethal Dose or LD50 In toxicology, median lethal dose or Lethal Dose 50% (LD50) is the amount of radiation or any other toxic substance that can kill half the members of a test population.
Grazer A consumer which attacks large numbers of large prey during its lifetime, but removes only a part of each prey individual, so that the effect, although often harmful, is rarely lethal in the short term, and never predictably lethal.
A chemical compound (to include experimental compounds) that, through its chemical properties produces lethal or other damaging effects on human beings, is intended for use in miIitary operations to kill, seriously injure, ...
"Our consumptive lifestyles are having lethal impacts on other people around the world, especially the poor," Patz said. "There are options now for leading more energy-efficient lives that should enable people to make better personal choices." ...
The ratio of the dose required to produce toxic or lethal effects to the dose required to produce non-adverse or therapeutic response.
Thermal Pollution
Discharge of heated water from industrial processes that can kill or injure aquatic organisms.
Therapeutic Index: The ratio of the dose required to produce toxic or lethal effects to the dose required to produce non-adverse or therapeutic response.
Biochemicals function as pesticides through non-toxic, non-lethal modes of action, such as disrupting the mating pattern of insects, regulating growth, or acting as repellants.
This is called the LD50 (Lethal Dose 50%) test of toxicity. In this experiment the LD50 value for many different household substances have been calculated.
Although each molecule of CO has one carbon atom and one oxygen atom, it has a shape similar to that of an oxygen molecule (two atoms of oxygen), which is important with regard to its lethality. (Source: PHYMAC).
 See also: Toxic, Environment, Water, Organism, Condition
  
|
RSS
