Glossary
Glossary of 50 Important Mold Terms
1. Aflatoxin: A type of mycotoxin produced by Aspergillus species, particularly A. flavus and A. parasiticus, known for their potent carcinogenic properties.
2. Air Sampling: A method used to collect airborne mold spores to assess indoor air quality and identify the types and concentrations of mold present.
3. Allergen: Any substance that can cause an allergic reaction. Mold spores are common allergens.
4. Allergic Reaction: An immune system response to a substance (allergen) that is not normally harmful, often involving symptoms like sneezing, runny nose, watery eyes, and skin rashes.
5. Amensalism: A biological interaction where one organism is inhibited or harmed, while the other is unaffected. Some molds produce compounds that inhibit the growth of bacteria.
6. Antimicrobial: A substance that kills or inhibits the growth of microorganisms, including mold.
7. Aspergillus: A common genus of mold found indoors and outdoors, some species of which can produce mycotoxins and cause allergic reactions or infections (aspergillosis).
8. Basidiospores: Spores produced by mushrooms and other fungi belonging to the phylum Basidiomycota. Some are allergenic.
9. Bioaerosols: Airborne particles of biological origin, including mold spores, pollen, bacteria, and viruses.
10. Black Mold (Stachybotrys chartarum): A greenish-black mold often associated with water-damaged building materials. It is known for producing potent mycotoxins.
11. Bleach (Sodium Hypochlorite): A common household disinfectant sometimes used to kill mold, though its effectiveness on porous materials and its ability to remove mycotoxins are debated.
12. Building Envelope: The physical barrier between the interior and exterior of a building, including the roof, walls, and foundation, which can be susceptible to moisture intrusion leading to mold growth.
13. Cellulose: A complex carbohydrate that forms the primary structural component of plant cell walls. Many molds thrive on cellulose-rich building materials like drywall and wood.
14. Chaetomium: A genus of mold commonly found on water-damaged materials, particularly cellulose-rich substrates like drywall.
15. Colony-Forming Unit (CFU): A unit used in microbiology to estimate the number of viable mold (or bacterial) cells in a sample capable of multiplying under controlled conditions.
16. Condensation: The process by which water vapor in the air changes into liquid water, often occurring on cool surfaces and providing moisture for mold growth.
17. Conidia/Conidiospores: Asexual, non-motile spores of a fungus, typically produced at the tip of specialized hyphae. Most common type of airborne mold spore.
18. Contamination: The presence of unwanted or harmful substances, such as mold, in an environment.
19. Dehumidifier: An appliance that reduces the level of humidity in the air, thereby limiting the moisture available for mold growth.
20. Dermatophytes: A group of fungi that cause superficial fungal infections of the skin, hair, and nails (e.g., athlete’s foot, ringworm). While not typically indoor molds, they are relevant in the context of human fungal exposure.
21. Efflorescence: Crystalline deposits of salts that can appear on the surface of masonry or concrete, often mistaken for mold but can indicate moisture problems that support mold growth.
22. Encapsulant: A material applied over mold-contaminated surfaces to contain residual mold and prevent its release into the air.
23. EPA (Environmental Protection Agency): A U.S. government agency that sets standards and provides guidance on environmental issues, including mold remediation.
24. Fungicide: A chemical agent that kills fungi, including molds.
25. Fungus/Fungi: A diverse kingdom of organisms that includes molds, yeasts, and mushrooms. They are heterotrophic and reproduce by spores.
26. Germination: The process by which a mold spore begins to grow and develop into a new mold colony when environmental conditions are favorable (e.g., presence of moisture and nutrients).
27. HEPA (High-Efficiency Particulate Air) Filter: A type of air filter that can theoretically remove at least 99.97% of dust, pollen, mold, bacteria, and any airborne particles with a size of 0.3 micrometers (µm).
28. Humidity: The amount of water vapor present in the air. High humidity can lead to condensation and mold growth.
29. Hydrophilic: Having a strong affinity for water. Some building materials are highly hydrophilic, absorbing moisture readily and becoming prone to mold growth.
30. Hyphae: The long, branching filamentous structures that make up the body (mycelium) of most fungi.
31. HVAC (Heating, Ventilation, and Air Conditioning) System: The system responsible for controlling the temperature, humidity, and air quality in a building. Can be a source or pathway for mold dissemination if not properly maintained.
32. Indoor Air Quality (IAQ): The air quality within and around buildings and structures, especially as it relates to the health and comfort of building occupants. Mold significantly impacts IAQ.
33. Lichen: A symbiotic organism consisting of a fungus and an alga or cyanobacterium. While not typically indoor mold, they indicate prolonged moisture exposure outdoors.
34. Microbial Volatile Organic Compounds (MVOCs): Gaseous chemicals produced by molds, often associated with the musty odor of mold.
35. Moisture Meter: A device used to measure the moisture content of materials, helping to identify areas with elevated moisture that could support mold growth.
36. Mold: A type of fungus that grows in multicellular filaments called hyphae. Molds reproduce by spores and are common decomposers in nature.
37. Mycelium: The vegetative part of a fungus, consisting of a network of branching filamentous hyphae. This is the visible growth of mold.
38. Mycology: The scientific study of fungi, including molds.
39. Mycotoxin: A toxic secondary metabolite produced by fungi (molds) that can have adverse effects on humans and animals.
40. N95 Respirator: A type of particulate-filtering facepiece respirator that filters at least 95% of airborne particles, commonly used during mold remediation.
41. Pathogen: A microorganism that can cause disease. Some molds are opportunistic pathogens.
42. Penicillium: A common genus of mold found indoors and outdoors, known for some species producing penicillin (an antibiotic) and others being allergenic or producing mycotoxins.
43. Personal Protective Equipment (PPE): Equipment worn to minimize exposure to hazards, including respirators, gloves, and protective clothing used during mold remediation.
44. Porous Material: Material with pores or spaces that allow liquids or gases to pass through, such as drywall, wood, and insulation, which are highly susceptible to mold growth once wet.
45. Remediation: The process of cleaning up and removing mold growth and contaminated materials from a structure.
46. Relative Humidity (RH): The ratio of the partial pressure of water vapor to the equilibrium vapor pressure of water at a given temperature, expressed as a percentage. Often a key factor in mold growth.
47. Spores: Reproductive cells of fungi (and other organisms) that can be easily dispersed through the air and germinate to form new mold colonies under favorable conditions.
48. Stachybotrys chartarum: See “Black Mold.”
49. Toxigenic Mold: A mold species capable of producing mycotoxins.
50. Water Activity (aw): A measure of the unbound water in a substance that is available for microbial growth. Molds typically require a water activity of 0.70 or higher to grow.
