- 行业: Library & information science
- Number of terms: 152252
- Number of blossaries: 0
- Company Profile:
The National Library of Medicine (NLM), on the campus of the National Institutes of Health in Bethesda, Maryland, is the world's largest medical library. The Library collects materials and provides information and research services in all areas of biomedicine and health care.
Proportion of a defined group that die within the specified time period (e.g., month, year).
Note: It may refer to all deaths or to deaths from a specific cause or specific causes.
Industry:Biology; Chemistry
Military operations using any organism (bacteria, virus or other disease-causing organism) or toxin found in nature, to kill, injure or incapacitate human beings, animals, or plants.
Industry:Biology; Chemistry
Physiological interface between the blood supply and the spermatozoa of the seminiferous tubules.
Note: This interface consists of specific junctional complexes between Sertoli cells.
Industry:Biology; Chemistry
Substance which attracts animals. Some attractants fulfill natural biological functions such as mating or predation: others may be used to attract animals for monitoring or for control.
Industry:Biology; Chemistry
1. Single dose of a substance, originally a large pill.
2. Dose of a substance administered by a single rapid intravenous injection.
3. Concentrated mass of food ready to be swallowed.
Industry:Biology; Chemistry
Skin reaction resulting from a single or multiple exposure to a physical or chemical entity at the same site, characterized by the presence of inflammation; it may result in cell death.
Industry:Biology; Chemistry
Quantity referring to the differences between the mean of a set of results or an individual result and the value which is accepted as the true or correct value for the quantity measured.
Industry:Biology; Chemistry
LD<sub>100</sub>. Lowest amount of a substance which kills 100 % of test animals under defined conditions. Note: This value is dependent on the number of organisms used in its assessment.
Industry:Biology; Chemistry
1. Total amount of biotic material, usually expressed per unit surface area or volume, in a medium such as water.
2. Material produced by the growth of micro-organisms, plants or animals.
Industry:Biology; Chemistry
Continued exposure or exposures occurring over an extended period of time, or a significant fraction of the test species' or of the group of individuals', or of the population's life-time.
Industry:Biology; Chemistry
