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NOAA Coral Reef Conservation Program, National Oceanic and Atmospheric Administration, U.S. Department of Commerce
The primary tissue of higher plants composed of thin-walled cells that remain capable of cell division, even when mature. Parenchyma constitutes the greater part of leaves, roots, the pulp of fruits, and the pith of stems. They are fundamental plant tissues as opposed to more highly differentiated tissues. In animals, the parenchyma constitutes the essential functional part of an organ, as contrasted with the organ's connective tissue, nerves, and blood vessels.
Industry:Natural environment
The unicellular external surface of a sponge (ectosome composed of pinacocytes).
Industry:Natural environment
The principle that the relative precedence of two or more names or nomenclatural acts published on the same date, or of different original spellings of the same name, is determined by the first reviser.
Industry:Natural environment
A chemical substance produced by one organism that is toxic or inhibitory to the growth or well being of another.
Industry:Natural environment
A form of hermaphroditism where individuals can change sex, but the sexes are separate.
Industry:Natural environment
A measure of the relationship between variables.
Industry:Natural environment
A public register showing the details of ownership and value of land; also spelled "cadastre".
Industry:Natural environment
A structure consisting of up to 35% iron compounds (iron oxides, iron carbonates, and iron hydroxides) that forms under water when wrought iron rusts. In appearance, it resembles an icicle or stalactite. The remainder of the structure is a complex community of symbiotic or mutualistic microorganisms, including bacteria and fungi, that use the rusting metal as a source of energy, collectively producing the mineral compounds as waste products and hence forming the rusticle. Structurally, the rusticle contains channels to allow water to flow through.They are very delicate, and easily disintegrate into a fine powder if disturbed. The outer surface of a rusticle is red in appearance while the core is bright orange.
Industry:Natural environment
An invagination at the base of an arm of a brittle star. Each bursa is a pouch lined with ciliated epidermis and is the primary respiratory surface for the organs of the perivisceral coelom. The epidermal cilia generate a ventilating current. The bursae have the gonads on the coelomic side of their wall.
Industry:Natural environment
