A green photosynthetic pigment found in plants, algae, and cyanobacteria (blue-green algae) that help convert carbon dioxide to carbohydrates and oxygen.
Of or made from or using substances produced by or used in reactions involving atomic or molecular changes; "chemical fertilizer"
The accumulation of a substance, such as a toxic chemical, in various tissues of a living organism (e.g. the bioaccumulation of mercury in fish).
What is Biological Soil Crust?
Communities of microorganisms, predominantly blue green algae, green algae, filamentous fungi, lichens, and non-vascular plants (mosses), which inhabit the surface soil layer in arid and semiarid landscapes throughout the world.
The tendency of a chemical to remain in the environment without transformation or breakdown into another chemical form. It refers to the length of time a chemical is expected to reside in the environment and be available for exposure.
Auxins are growth hormones found in plants.
Testing guidelines prepared by the Organization of Economic and Cooperative Development of the United Nations. They assist in preparation of protocols for studies of toxicology, environmental fate, etc.
The fertilizing element of flowering plants; background air pollutant.
The study of the way that drugs move through the body after they are swallowed or injected.
Discharge of effluent from waste water treatment plants which receive waste water from households, commercial establishments, and industries in the coastal drainage basin. Combined sewer/separate storm overflows are included in this category.
Liquid particles measuring 40 to 500 micrometers (pm), are formed by condensation of vapor. By comparison, fog particles are smaller than 40 micrometers (pm).
Pesticide application in and around houses, office buildings, apartment buildings, motels, and other living or working areas.
What is a Medium-size Water System?
A water system that serves 3,300 to 50,000 customers.
The addition of hydrogen, removal of oxygen, or addition of electrons to an element or compound.
Planting crops without prior seedbed preparation, into an existing cover crop, sod, or crop residues, and eliminating subsequent tillage operations.
Larger publicly owned treatment works (POTWs) with flows equal to at least one million gallons per day (mgd) or servicing a population equivalent to 10,000 persons; certain other POTWs having significant water quality impacts. (See: minors.)
For Recyclable paper from books, third-class mail, commercial printing, paper towels, plates and cups; and other nonpackaging paper such as posters, photographic papers, cards and games, milk cartons, folding boxes, bags, wrapping paper, and paperboard. Does not include wrapping paper or shipping cartons.
(In indoor air program) Refers to air exhausted from a building that is immediately brought back into the system through the air intake and other openings.
In flowing air, the sum of the static and velocity pressures.
What is a Public Health Approach?
Regulatory and voluntary focus on effective and feasible risk management actions at the national and community level to reduce human exposures and risks, with priority given to reducing exposures with the biggest impacts in terms of the number affected and severity of effect.
