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Half-life (t?)
| Toxic Substances Glossary |
The time it takes for half the original amount of a substance to disappear. in the environment, the half-life is the time it takes for half the original amount of a substance to disappear when it is changed to another chemical by bacteria, fungi, sunlight, or other chemical processes. in the human body, the half-life is the time it takes for half the original amount of the substance to disappear, either by being changed to another substance or by leaving the body. in the case of radioactive material, the half life is the amount of time necessary for one half the initial number of radioactive atoms to change or transform into another atom (that is normally not radioactive). after two half lives, 25% of the original number of radioactive atoms remain.
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Half-life, английский
- Half-life is closely related to the property of radioactive decay and represents the time taken for half the atoms in a radioactive substances to undergo decay and change into another nuclear form (either a radioactive daughter product or a stable form).
- 1. a measurement of the period of time taken before the concentration of a drug has reached half of what it was when it was administered 2. the time taken for half the atoms in a radioactive isotope to decay
- The point in the life of a mortgage-backed security guaranteed or issued by the government national mortgage association, the federal national mortgage association or the federal home loan mortgage corporation when half the principal has been repaid.
Half-life (biological), английский
- The biological half-life is the time taken for half of a radioactive material, (present in a body as a result of inhalation , ingestion , injection or absorption ), to be eliminated by the biological processes in that body.
- The time required for a biological system, such as a man or an animal, to eliminate, by natural processes, half the amount of a substance that has entered it.
Half-life (rt), английский
The time in which half the atoms in a radioactive substance disintegrate. half-lives vary from millionths of a second to billions of years.
Half-life period, английский
Environment, английский
- Surrounding in which operates, including air, water, land, natural resources, flora, fauna, humans and their interaction.
- Окружающая среда. совокупность всех материальных тел, сил и явлений природы, ее вещество и пространство, любая деятельность человека, находящегося в непосредственном контакте с живыми организмами; совокупность абиотической, биотической и социальной сред,
- Окружающие условия [среда]; внешние факторы или воздействия; условия эксплуатации ` (лл)
- The conditions and influences under which an organism lives
- N 1 лнгв. окружение; 2 псхл. окружающая обстановка5 consonantal ~ консонантное окружение epanalepsis n эпаналепсис, удвоение6 epenthesis n 1 эпентеза, вставка звуков1; 2 добавление гласного звука для того, чтобы 3 английский как язык международного общения. 4 несовпадение стиховых и фразовых границ. 5 внешний контекст, в котором происходит наше поведение. 6 фигура речи, состоящая в повторе слова, словосочетания или пред- ложения. epenthetic 41 evaluation разбить труднопроизносимую группу (кла- стер) согласных
- Окружающая среда
- Окружающая среда; при- родно-ландшафтная среда
- The place in which an organism lives, and the circumstances under which it lives. environment includes measures like moisture and temperature, as much as it refers to the actual physical place where an organism is found.
- The combination of all the external conditions and the potential effect of the inner environment (heteromosaic of abiotic conditions). e. change: survival depends on the life span of the organisms involved, and has to adapt to a new situation via genetic change, evolution, etc. • cyclic change: rhythmically repetitive, like cycles of a season, day / night, movement of tides etc. • directional change: change is maintained over a long period in relation to the life span of organisms - erosion, siltation, cycles of glaciation, etc. • erratic change: these have no rhythm and no consistent direction e.g., hurricanes, cyclones, flash storms, fires, vulcanos, earthquake, etc.
- Окружающая среда. существующая в данный момент совокупность всех внешних условий и воздействий, которым подвержена данная система (или организм) (мос, 14). `36
- (1) the system of surrounding things, conditions or influences, especially affecting the existence or development of someone, something or another system (->habitat), (2) the art of environing, (3) the state of being environed.
- A global context in which to access data.
- A set of roles that are required to run a specific application and the machines to be used for each role.
- One of two deployment destinations within a microsoft azure cloud service: staging or production.
- The totality of surrounding conditions and circumstances affecting growth or development. often the term is applied to the natural features of a geographic area: water, air, and land — including ecological relationships.
- The sum of the physical, chemical, and biological factors that surround an organism.
Radioactive, английский
- Radioactive can generally describe the property of a substance (or more accurately atomic nuclei) which are unstable and spontaneously decay (disintegrate) with the release of energy, the energy being either electromagnetic radiation , particulate or both
- Радиоактивный
- Generally, the property possessed by certain elements, such as uranium minerals, of spontaneously emitting alpha, teta, and/or gamma rays by the disintegration of the nuclei of their atoms.
- Atoms that are energetically unstable and decay to a stable condition by emitting radiation are said to be radioactive.
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Body burden, английский
- The total amount of a substance in the body. some substances build up in the body because they are stored in fat or bone or because they leave the body very slowly.
- The amount of radioactive material present in the body of man or animals.
Toxicology, английский
- The study of the harmful effects of substances on humans or animals.
- The scientific study of poisons and their effects on the human body
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