Physical changes in the growth patterns of a plant brought on by sustained absence of light. These changes are characterized by lengthened internodes which produce long weak stems, fewer leaves, and pale yellow color (chlorosis). The physiological basis for etiolation is induction of the phytohormone, AUXIN.
Relatively permanent change in behavior that is the result of past experience or practice. The concept includes the acquisition of knowledge.
A course of study offered by an educational institution.
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 principle that items experienced together enter into a connection, so that one tends to reinstate the other.
Professional society representing the field of dentistry.
The presence of bacteria, viruses, and fungi in the soil. This term is not restricted to pathogenic organisms.
Complete loss of phonation due to organic disease of the larynx or to nonorganic (i.e., psychogenic) causes.
A game whose object is to sink a ball into each of 9 or 18 successive holes on a golf course using as few strokes as possible.
The science of controlling or modifying those conditions, influences, or forces surrounding man which relate to promoting, establishing, and maintaining health.
Nematocide used in livestock; also has fungicidal properties.
A plant genus of the family POACEAE.
Inland bodies of standing FRESHWATER usually smaller than LAKES. They can be man-made or natural but there is no universal agreement as to their exact size. Some consider a pond to be a small body of water that is shallow enough for sunlight to reach the bottom.
A large family of narrow-leaved herbaceous grasses of the order Cyperales, subclass Commelinidae, class Liliopsida (monocotyledons). Food grains (EDIBLE GRAIN) come from members of this family. RHINITIS, ALLERGIC, SEASONAL can be induced by POLLEN of many of the grasses.
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