#azot

• Prickly moses — A species of small thorny shrub endemic to southwestern Western Australia, remarkable for its ecological value and delicate beauty. The plant features true, finely divided, deep green bipinnate leaves, protected by sharp stipular spines located at the stem nodes. Popularly known as the 'prickly moses', this species is famous not only for its brilliant golden-yellow globular inflorescences, but also for its unique capacity to fix nitrogen in the soil and to display a natural resistance against the destructive attacks of the dieback fungus Phytophthora cinnamomi.
• Etching — An artistic method of engraving metal plates (especially copper or zinc) through the corrosive action of nitric acid, followed by printing the resulting design onto paper; also, the traditional name given to the diluted nitric acid used for this purpose. This structural term describes a fundamental technique in graphic arts, famous for line precision and texture depth.
• Etcher — A visual artist, graphic designer, or engraver specializing in the etching technique (aqua fortis), an artistic process of printing from metal plates corroded with nitric acid. This specialist combines drawing mastery with the precision of industrial chemical reactions, controlling the matrix exposure time in the acid bath to achieve fine gradations of shadow, expressive lines, and textures of remarkable aesthetic depth.
• Adenine — A fundamental purine nitrogenous base, with a heterocyclic structure composed of two condensed rings, an essential component of nucleic acids (DNA and RNA). It plays a crucial structural role in storing and transmitting genetic information through specific hydrogen bonds with thymine or uracil, being also a key element in molecules vital for cellular energy metabolism, such as ATP.
• Air — The invisible, odorless, and tasteless gaseous mixture that makes up the Earth's atmosphere, structurally composed mainly of nitrogen (about 78%) and oxygen (about 21%), along with small amounts of argon, carbon dioxide, and other gases. Figuratively, the term describes an appearance, demeanor, a specific atmosphere of a place, or a gentle breeze of wind.
• Elaeagnus — An unofficial, erroneous, or regional orthographic variant for the deciduous or semi-evergreen plant genus 'Elaeagnus' belonging to the Elaeagnaceae family, native to Asia and Europe (such as the silverberry or wild olive); it is structurally distinguished by silvery foliage covered with scaly stellate hairs and the production of reddish or yellow, often edible berries. These robust shrubs possess an exceptional biological capacity to fix nitrogen in the soil through root bacterial nodules, being heavily used in ecological landscape design for stabilizing eroded soils and creating drought-resistant hedges.
• Alkaloid — A nitrogenous organic substance, typically possessing a basic (alkaline) character and a complex heterocyclic structure, primarily biosynthesized by plants, but also by certain fungi or animals. Alkaloids exhibit intense pharmacodynamic action on the central nervous system and the human body, functioning, depending on the dosage, as essential medicines, stimulants, or highly violent poisons (for example: morphine, caffeine, nicotine, atropine, quinine).
• Alkaloidal — Pertaining to alkaloids, containing alkaloids, or possessing properties similar to these nitrogenous organic compounds. The term describes extracts, solutions, or chemical structures derived from medicinal or toxic plants, characterized by an intense pharmacodynamic action on the central nervous system.
• Aldimines — A class of nitrogenous organic compounds formally derived from an aldehyde, by replacing the carbonyl oxygen atom with an imino group (=N-R or =N-H). These represent secondary imines or Schiff bases with the general structure R-CH=N-R', serving as highly valuable intermediates in fine organic synthesis, drug manufacturing, and enzymatic biochemistry.
• Green alder — Specific epithet and taxonomic designation used in botany to identify the green alder (Alnus alnobetula), a highly resilient mountain and subalpine shrub with flexible, branched stems. This biological entity serves as an ecological indicator for cold regions, gravelly riverbeds, and steep slopes exposed to avalanches, possessing a unique capacity for nitrogen fixation through bacterial symbiosis.
• Alder — Taxonomic genus of deciduous trees and shrubs in the Betulaceae family, commonly known as alders. Characterized by roots with symbiotic nodules capable of fixing atmospheric nitrogen and by woody fruits resembling small cones, the genus includes numerous species widespread across temperate and subarctic zones.
• Alnus glutinosa — The scientific name of the black alder, a deciduous tree species in the family Betulaceae, native to most of Europe, Western Asia, and northern Africa. This structural tree thrives in excessively wet soils, swamps, and along watercourses, possessing the ecological ability to fix atmospheric nitrogen into the soil through root bacterial symbiosis and features dark green leaves that are sticky when young.
• Alnus viridis — The scientific name of the green alder, a species of perennial shrub in the Betulaceae family, adapted to cold climates, mountainous, or subarctic zones; it plays a crucial structural ecological role in stabilizing steep soils, preventing erosion, and fixing atmospheric nitrogen through root symbioses.
• Amarine — A toxic organic substance, alkaloid, or complex heterocyclic compound historically extracted from bitter fruit kernels or synthesized from hydrobenzamide, characterized by an extremely bitter taste and crystalline structure.
• Amatol — A military explosive material composed of a homogeneous mixture of trinitrotoluene (TNT) and ammonium nitrate, widely used during World War I and World War II for filling artillery shells, aerial bombs, and naval mines.
• Ambrosioides — A specific epithet used in plant taxonomy to designate a species that strongly resembles the appearance, inflorescence shape, or scent of plants in the genus Ambrosia. The term combines the root 'Ambrosia' with the Greek suffix '-oides' (resembling, having the form of), serving as a frequent visual or olfactory indicator in scientific species identification (e.g., Dysphania ambrosioides, commonly known as epazote).
• Amidase — An enzyme belonging to the hydrolase class that catalyzes the hydrolytic cleavage of a linear amide bond, converting an amide compound into a carboxylic acid and ammonia or a corresponding amine. This biocatalyst plays an essential structural role in nitrogen metabolism, cellular detoxification processes, and industrial biocatalysis used for the enantioselective synthesis of high-purity pharmaceutical compounds.
• Amyl — An acyclic saturated pentavalent alkyl radical, with the general structural formula -C5H11, formally derived from pentane by removing one hydrogen atom; an alternative systematic name for the pentyl group. This compound plays an essential structural role in industrial organic synthesis and pharmacology, serving as the core component in volatile chemicals such as amyl nitrite, used clinically as a potent vasodilator.
• Amino- — A scientific combining form (prefixoid) used in international chemical nomenclature to indicate the presence of the monovalent functional group (-NH2), derived from ammonia, within the structure of an organic compound. As an invariable adjective, it is used in biochemistry to designate fundamental compounds, such as amino acids, which form the basis of protein synthesis in all living organisms.
• Aminous — Containing or exhibiting the characteristics of an amino group or an nitrogen-modified carbohydrate structure; relating to compounds that possess a high content of aminic radicals. It can also function contextually as a simplified structural or linguistic variant for amino sugars found in the composition of complex polysaccharides within cell walls.