Mold
Overview
Mold is a multicellular microorganism belonging to the kingdom Fungi (균계), a eukaryote that primarily lives by forming a mycelium (균사체) composed of thread-like hyphae (균사). In nature, it acts as a decomposer of dead organic matter, essential for material cycling in ecosystems, and has both beneficial aspects for humans, such as food fermentation and pharmaceutical production, and harmful aspects, including food spoilage and disease causation. Approximately 120,000 species are known worldwide, but the actual number is estimated to exceed 1.5 million.
Main Content
Structure and Physiology of Mold
The basic unit of mold is the hypha, with cell walls primarily composed of chitin (키틴). Hyphae can be divided into those with septa (격벽) and those without; hyphae without septa are called coenocytic hyphae (격벽이 없는 균사). The mycelium extends over substrates to absorb nutrients, and when environmental conditions become unfavorable, it reproduces by forming spores (포자). Spores are classified into asexual spores (conidia, sporangiospores) and sexual spores (ascospores, basidiospores), and are dispersed through air, water, animals, etc.
Major Taxonomic Groups
Mold has traditionally been classified based on morphology, but currently, it is divided into four major phyla based on molecular phylogenetics.
- Zygomycota (접합균문): Representative examples include bread mold (Rhizopus stolonifer). They lack septa and form zygospores during sexual reproduction.
- Ascomycota (자낭균문): The largest phylum, including yeasts, blue mold (Penicillium), and koji mold (Aspergillus). They produce sexual spores inside an ascus (자낭).
- Basidiomycota (담자균문): Includes mushrooms and wood-decay fungi. They form sexual spores on a basidium (담자기).
- Incertae sedis (분류 불확실 군): Fungi formerly classified under Zygomycota but now treated separately.
Ecological Role
Mold acts as a decomposer in ecosystems, converting organic matter into inorganic substances that plants can utilize. It also forms mycorrhizae (균근) in symbiosis with plants, aiding nutrient absorption, and some constitute lichens (지의류), enabling survival in extreme environments. Pathogenic molds can cause diseases in plants, animals, and humans.
Relationship with Humans
Beneficial Aspects:
- Food Fermentation: Cheese (Penicillium roqueforti in blue cheese), soy sauce, doenjang (Aspergillus oryzae), bread yeast (Saccharomyces cerevisiae), etc.
- Pharmaceuticals: Penicillin (Penicillium chrysogenum), statins (Aspergillus terreus), cyclosporine (Tolypocladium inflatum), etc.
- Biotechnology: Production of organic acids, enzymes, pigments, wastewater treatment, biological control.
Harmful Aspects:
- Food Spoilage: Mold causes spoilage of bread, fruits, vegetables, leading to economic losses.
- Toxin Production: Aflatoxin (Aspergillus flavus), ochratoxin, etc., are carcinogenic substances.
- Diseases: Dermatophytes (ringworm, athlete's foot), pulmonary aspergillosis, allergic rhinitis, asthma induction.
- Building Damage: Wood decay, deterioration of indoor air quality due to mold.
Mold Control and Management
At home, humidity control (below 50%), ventilation, and surface sterilization using bleach or vinegar are effective. For food storage, sealing, refrigeration, and drying are basic; if mold has already appeared, it is safer to discard the food as spores may have spread. Medical treatment involves antifungal agents (terbinafine, fluconazole, etc.).
Recent Trends
As of 2024-2025, mold research and applications are developing in the following directions.
- Increasing Antifungal Resistance: Multidrug-resistant molds like Candida auris (칸디다 아우리스) are spreading globally, making the development of new antifungal agents an urgent task. WHO published the first fungal pathogen priority list in 2022.
- Mold-Based Materials: Eco-friendly packaging materials and leather alternatives (e.g., Mycoworks, Bolt Threads) using mycelium have entered commercialization. In 2024, mold bricks and insulation materials gained attention in the construction field.
- Climate Change and Mold: Global warming is expanding the habitat range of molds, raising the possibility of new pathogenic molds emerging. In 2025, a study reported the reactivation of ancient molds from Arctic permafrost.
- Precision Fermentation Technology: Genetic editing (CRISPR) is actively used to improve mold strains, significantly enhancing the production efficiency of alternative proteins, flavors, and pharmaceutical intermediates.
- Mold Microbiome: Research on the relationship between the human gut fungal flora (mycobiome) and health has surged, revealing correlations with inflammatory bowel disease, obesity, and allergies.
Related Topics
- [[Fungi]]
- [[Penicillin]]
- [[Aflatoxin]]
- [[Fermentation]]
- [[Antifungal]]
- [[Lichen]]
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