#azo

• Azotometer — A laboratory apparatus used for the quantitative determination of the volume of nitrogen released from a chemical reaction, or for measuring the concentration of nitrogenous compounds within a complex substance (such as soil or fertilizers); it typically operates on eudiometric or volumetric principles.
• Nitrogen mustard — A toxic chemical compound from the nitrogen mustard class, derived from an aliphatic amine where hydrogen atoms are replaced by chloroethyl groups; an oily, persistent liquid substance with a strong blistering (vesicant) effect, devastating to tissues and the respiratory system, historically used as a chemical warfare agent.
• Nitrite — A salt of nitrous acid containing the stable NO2 functional group; in modern chemical and industrial nomenclature, it is known as a nitrite, widely used in the food industry as a preservative and color stabilizer for meat products, or in metallurgy as a corrosion inhibitor.
• Nitrous acid — A systematic name rarely used to designate nitrous acid (HNO2) in correlation with its salts; also, a term applied in old records to the hydrated forms or unstable aqueous solutions of lower-valence nitrogen oxides.
• Azotobacter — A genus of aerobic, motile, oval or spherical bacteria that live freely in the soil and possess the remarkable capacity to fix molecular atmospheric nitrogen directly into organic compounds assimilable by plants, without establishing a symbiotic relationship with their roots; it is widely used in bio-agriculture as a biofertilizer to stimulate soil fertility.
• Azotobacterial — Pertaining to the bacterium genus Azotobacter, belonging to it, or produced by the metabolic activity of these microorganisms; often used to describe biological preparations, laboratory cultures, or non-symbiotic nitrogen-fixing processes in the soil.
• Azotobacter bacterium — A generic name utilized in technical or regional speech for any bacterium belonging to the Azotobacter genus; an aerobic microorganism capable of non-symbiotic fixation of molecular nitrogen directly from the air within the upper soil layers.
• Azotobacterin — A bacterial preparation or biological fertilizer produced from pure cultures of Azotobacter chroococcum or other bacteria capable of fixing molecular nitrogen from the atmosphere. It is applied to seeds or directly into the soil to improve plant nitrogen nutrition, stimulating rhizosphere biological activity and increasing crop yields without synthetic chemical inputs.
• Azotophilic — Developing optimally in nitrogen-rich environments or showing a pronounced biological affinity for nitrogenous compounds. In botany and microbiology, the term describes organisms (bacteria, fungi, or nitrophilous plants) whose structural metabolic processes and multiplication rates are directly stimulated by a high concentration of available nitrogen in the substrate.
• Azotophilic — The feminine form of the adjective azotophilous; it characterizes a plant species, bacterial strain, or microbial population that displays a pronounced structural affinity for soils or growth media saturated with nitrogen compounds. In an ecological sense, it describes nitrophilous indicator plants that colonize anthropized or heavily fertilized habitats where organic matter decomposition releases large amounts of ammonia and nitrates.
• Azotogenic — Producing, generating, or giving rise to nitrogen or its compounds. In geology and biochemistry, the term describes natural processes or specific substances that, through structural transformations or microbial denitrification reactions, release gaseous molecular nitrogen into the atmosphere or contribute to the structural synthesis of amino acids.
• Azotometer — A laboratory apparatus or precision instrument used for the quantitative determination of the volume of nitrogen released during a chemical reaction or organic decomposition process. This structural device, typically made of borosilicate glass and equipped with a graduated scale, is essential in volumetric elemental analyses for measuring the purity of gaseous compounds.
• Nitrous — Containing nitrogen, possessing properties resembling those of nitrogen, or structurally derived from its compounds where the element has a lower valence. In traditional chemical nomenclature, the term describes acids, salts, or derivative substances (such as nitrous acid, HNO₂) that play an essential transient role in industrial synthesis processes and biogeochemical cycles.
• Azide — A binary chemical compound formed by the combination of nitrogen with a more electropositive element, usually a metal or a specific non-metal. Depending on the bond structure, they can be ionic, covalent, or interstitial, being characterized by high thermal stability for some metals or pronounced explosive properties, such as heavy metal azides used as detonators.
• Azoturia — The quantitative elimination of nitrogen or its nitrogenous compounds (especially urea, uric acid, and creatinine) through urine within a specified timeframe. Clinical evaluation of azoturia is a fundamental indicator in analyzing the body's nitrogen balance, reflecting the protein catabolism rate and renal filtration efficiency.
• Azov — A geographical proper noun designating an inland sea connected to the Black Sea via the Kerch Strait, a historic Russian city located at the mouth of the Don River, as well as various structuresor military units named after this strategic region in Eastern Europe.
• Nitrous — Containing nitrogen, possessing properties resembling those of nitrogen, or structurally derived from its compounds where the element has a lower valence. In traditional chemical nomenclature, the term describes acids, salts, or derivative substances (such as nitrous acid, HNO₂) that play an essential transient role in industrial synthesis processes and biogeochemical cycles.
• Bacteriorhiza — A stable symbiotic association formed between the roots of higher plants and certain soil bacteria, particularly nitrogen-fixing ones (such as Rhizobium species). Physiologically, this ecological structure allows plants (especially legumes) to assimilate atmospheric nitrogen transformed by bacteria into accessible compounds, while the microorganisms receive carbohydrates derived from photosynthesis.
• Bacteroid — A modified, enlarged, and often branched form adopted by nitrogen-fixing bacterial cells (such as Rhizobium) after entering the host cells within the nodules of legume plants. Physiologically, the bacteroid stage represents the active metabolic phase where the microorganism loses its rigid cell wall and begins synthesizing the nitrogenase enzyme complex responsible for nitrogen fixation.