Environmental reservoirs of water related to natural WATER CYCLE by which water is obtained for various purposes. This includes but is not limited to watersheds, aquifers and springs.

Means or process of supplying water (as for a community) usually including reservoirs, tunnels, and pipelines and often the watershed from which the water is ultimately drawn. (Webster, 3d ed)

A clear, odorless, tasteless liquid that is essential for most animal and plant life and is an excellent solvent for many substances. The chemical formula is hydrogen oxide (H2O). (McGraw-Hill Dictionary of Scientific and Technical Terms, 4th ed)

Contamination of bodies of water (such as LAKES; RIVERS; SEAS; and GROUNDWATER.)

Circulation of water among various ecological systems, in various states, on, above, and below the surface of the earth.

Interactional process combining investigation, discussion, and agreement by a number of people in the preparation and carrying out of a program to ameliorate conditions of need or social pathology in the community. It usually involves the action of a formal political, legal, or recognized voluntary body.

The flow of water in enviromental bodies of water such as rivers, oceans, water supplies, aquariums, etc. It includes currents, tides, and waves.

Large natural streams of FRESH WATER formed by converging tributaries and which empty into a body of water (lake or ocean).

Water containing no significant amounts of salts, such as water from RIVERS and LAKES.

The protection, preservation, restoration, and rational use of all resources in the total environment.

The routing of water to open or closed areas where it is used for agricultural purposes.

A rating of a body of water based on measurable physical, chemical, and biological characteristics.

Substances or organisms which pollute the water or bodies of water. Use for water pollutants in general or those for which there is no specific heading.

Chemical compounds which pollute the water of rivers, streams, lakes, the sea, reservoirs, or other bodies of water.

Increase, over a specific period of time, in the number of individuals living in a country or region.

The science, art or practice of cultivating soil, producing crops, and raising livestock.

The monitoring of the level of toxins, chemical pollutants, microbial contaminants, or other harmful substances in the environment (soil, air, and water), workplace, or in the bodies of people and animals present in that environment.

A functional system which includes the organisms of a natural community together with their environment. (McGraw Hill Dictionary of Scientific and Technical Terms, 4th ed)

Any significant change in measures of climate (such as temperature, precipitation, or wind) lasting for an extended period (decades or longer). It may result from natural factors such as changes in the sun's intensity, natural processes within the climate system such as changes in ocean circulation, or human activities.

Water particles that fall from the ATMOSPHERE.

The presence of bacteria, viruses, and fungi in water. This term is not restricted to pathogenic organisms.

Available manpower, facilities, revenue, equipment, and supplies to produce requisite health care and services.

Theoretical representations that simulate the behavior or activity of systems, processes, or phenomena. They include the use of mathematical equations, computers, and other electronic equipment.

Fluids composed mainly of water found within the body.

Any of several processes in which undesirable impurities in water are removed or neutralized; for example, chlorination, filtration, primary treatment, ion exchange, and distillation. It includes treatment of WASTE WATER to provide potable and hygienic water in a controlled or closed environment as well as provision of public drinking water supplies.

Societal or individual decisions about the equitable distribution of available resources.

A loose confederation of computer communication networks around the world. The networks that make up the Internet are connected through several backbone networks. The Internet grew out of the US Government ARPAnet project and was designed to facilitate information exchange.

The withholding of water in a structured experimental situation.

'Water softening' is a water treatment process that reduces the hardness of water by removing calcium, magnesium, and certain other metal cations (such as iron and manganese) through the use of ion-exchange resins or other methods like nanofiltration or reverse osmosis.

The consumption of liquids.

Planning for the equitable allocation, apportionment, or distribution of available health resources.

The portion of an interactive computer program that issues messages to and receives commands from a user.

Databases devoted to knowledge about specific genes and gene products.

A class of porins that allow the passage of WATER and other small molecules across CELL MEMBRANES.

Organized activities related to the storage, location, search, and retrieval of information.

Sequential operating programs and data which instruct the functioning of a digital computer.

The salinated water of OCEANS AND SEAS that provides habitat for marine organisms.

The term "United States" in a medical context often refers to the country where a patient or study participant resides, and is not a medical term per se, but relevant for epidemiological studies, healthcare policies, and understanding differences in disease prevalence, treatment patterns, and health outcomes across various geographic locations.

The systematic study of the complete DNA sequences (GENOME) of organisms.

The balance of fluid in the BODY FLUID COMPARTMENTS; total BODY WATER; BLOOD VOLUME; EXTRACELLULAR SPACE; INTRACELLULAR SPACE, maintained by processes in the body that regulate the intake and excretion of WATER and ELECTROLYTES, particularly SODIUM and POTASSIUM.

Elements of limited time intervals, contributing to particular results or situations.

Constructions built to access underground water.

A field of biology concerned with the development of techniques for the collection and manipulation of biological data, and the use of such data to make biological discoveries or predictions. This field encompasses all computational methods and theories for solving biological problems including manipulation of models and datasets.

The unconsolidated mineral or organic matter on the surface of the earth that serves as a natural medium for the growth of land plants.

The property of objects that determines the direction of heat flow when they are placed in direct thermal contact. The temperature is the energy of microscopic motions (vibrational and translational) of the particles of atoms.

Organized services to provide information on any questions an individual might have using databases and other sources. (From Random House Unabridged Dictionary, 2d ed)

Systems where the input data enter the computer directly from the point of origin (usually a terminal or workstation) and/or in which output data are transmitted directly to that terminal point of origin. (Sippl, Computer Dictionary, 4th ed)