Growing, living, or occurring in the presence of molecular oxygen; for example, bacteria that require oxygen to survive.

Growing, living, or occurring in the absence of molecular oxygen.

Fat of the white whale, Delphinapterus leucas; the fat is commonly called blubber.

The total amount of a chemical, metal, or radioactive substance present at any time after absorption in the body of a human or animal.

Combined or saturated with bromine or any of its compounds.

An agent capable of initiating development of malignant tumors; may be a chemical, a form of electromagnetic radiation, or an inert solid body.

Any organic chemical that includes chlorine atoms; chlorinated organic compounds, along with other halogenated organics, have been implicated in health risks such as cancer, endocrine system disruption, birth defects, compromised immune systems, and reduced fertility.

One of two or more compounds of the same kind with respect to classification.

Anew; often applied to particular biochemical pathways in which metabolites are newly biosynthesized (e.g., de novo purine biosynthesis).

A quantity to be administered at one time, such as a specified amount of medication.

The study of the distribution and determinants of health-related states and events in populations and the control of health problems; the study of epidemic disease.

The condition of being subjected to the effects of a substance, such as infectious agents, that may have a harmful effect.

A toxin (poisonous substance) that harms the body by damaging DNA molecules, causing mutations that may lead to tumors or neoplasms.

refers to a chemical compound or mixture that contains halogen atoms; halogen refers to those elements in the seventeenth column of the periodic table: fluorine, chlorine, bromine, iodine, and astatine.

Not of uniform composition, quality, or structure.

The splitting of a compound into fragments by the addition of water, the hydroxyl group being incorporated in one fragment and the hydrogen atom in the other.

Pertaining to immunology, a subfield of biology that deals with the study of antigens and the immune process and how humans and higher animals fight off disease.

A technique using radioactive tracers that can be used to determine the amount of a single substance in a mixture.

The period of the secretion of milk.

An element that has an affinity for lipid.

The skin and underlying fat (blubber) layer of a whale.

The skin and underlying fat (blubber) layer of the whale Monodon monoceros. Mattak is commonly used as the dialect representation of muktuk in Baffin Inuktitut language.

Neurological status as assessed by observation of behavior.

Development of the central and peripheral nervous systems starting at conception and going through the life span of an organism.

Chemical substance that persists in the environment, bioaccumulates through the food web, and poses a risk of causing adverse effects to human health and to the environment.

Light induced cleavage of a chemical bond, as in the process of photosynthesis.

Rate of the outcome of interest in a population compared with the rate in the reference population.

Pertaining to time; limited as to time.

The quality of being poisonous, especially the degree of virulence of a toxic microbe or of a poison.

The time course of disposition (absorption, distribution, biotransformation, and excretion) of xenobiotics (foreign chemicals to which organisms are exposed) in the whole organism.

Pertaining to the lower layer of the earth's atmosphere in which the change of temperature with height is relatively large; it is the region where clouds form, convection is active, and mixing is continuous and more or less complete.

Phase when substances transition from a liquid state to gaseous state through the breaking of molecular bonds.

Readily vaporizable at a low temperature.