{"query": "Nitrogen (N) — element 7", "count": 20, "results": [{"id": "card_ref_el_007", "title": "Nitrogen (N) — element 7", "shelf": "chemistry", "surface": "secular", "snippet": "Atomic number 7. Symbol N. Standard atomic weight 14.007. The nitrogen atom carries 7 protons in its nucleus; its place in the periodic table is fixed by that count. Verified reference data.", "authority_tier": "reference", "source": "Verified reference — chemistry", "generated": false}, {"id": "card_theory_haber_bosch", "title": "Haber–Bosch nitrogen fixation (bread from air)", "shelf": "theories", "surface": "secular", "snippet": "Haber–Bosch nitrogen fixation (bread from air) — an engine domain that can touch it: chemistry. Calibration: seals — stoichiometry, yield and equilibrium shifts compute. N₂ + 3H₂ ⇌ 2NH₃, run at roughl", "authority_tier": "reference", "source": "The Theory Assay — calibrated, not judged (docs/THEORY_CATALOG.md)", "generated": false}, {"id": "card_theory_biological_nitrogen_fixation", "title": "Crop rotation & biological nitrogen fixation (the low-input path)", "shelf": "theories", "surface": "secular", "snippet": "Crop rotation & biological nitrogen fixation (the low-input path) — an engine domain that can touch it: agriculture. Calibration: map-only — rotation effects are empirical; nutrient budgets compute. L", "authority_tier": "reference", "source": "The Theory Assay — calibrated, not judged (docs/THEORY_CATALOG.md)", "generated": false}, {"id": "card_theory_law_of_the_minimum", "title": "Liebig's law of the minimum (what actually limits growth)", "shelf": "theories", "surface": "secular", "snippet": "Liebig's law of the minimum (what actually limits growth) — an engine domain that can touch it: soil_science. Calibration: seals — nutrient ratios and deficiency thresholds compute. Growth is limited ", "authority_tier": "reference", "source": "The Theory Assay — calibrated, not judged (docs/THEORY_CATALOG.md)", "generated": false}, {"id": "card_theory_stellar_nucleosynthesis_the_hr_diagram", "title": "Stellar nucleosynthesis & the HR diagram", "shelf": "theories", "surface": "secular", "snippet": "Stellar nucleosynthesis & the HR diagram — an engine domain that can touch it: astronomy. Calibration: partial — specific relations verify; the theory as a whole is not a sealable computation. Where t", "authority_tier": "reference", "source": "The Theory Assay — calibrated, not judged (docs/THEORY_CATALOG.md)", "generated": false}, {"id": "card_theory_nutrient_cycling_agronomy", "title": "Nutrient cycling & agronomy (NPK, evapotranspiration)", "shelf": "theories", "surface": "secular", "snippet": "Nutrient cycling & agronomy (NPK, evapotranspiration) — an engine domain that can touch it: soil_science. Calibration: seals — nutrient budgets and ET rates compute. Elements cycle between soil, plant", "authority_tier": "reference", "source": "The Theory Assay — calibrated, not judged (docs/THEORY_CATALOG.md)", "generated": false}, {"id": "card_theory_green_revolution", "title": "The Green Revolution (Borlaug, semi-dwarf breeding)", "shelf": "theories", "surface": "secular", "snippet": "The Green Revolution (Borlaug, semi-dwarf breeding) — an engine domain that can touch it: agriculture. Calibration: map-only — yields are historical measurements, not a sealable computation. Norman Bo", "authority_tier": "reference", "source": "The Theory Assay — calibrated, not judged (docs/THEORY_CATALOG.md)", "generated": false}, {"id": "card_theory_agricultural_science", "title": "Agricultural science (yield, soil-pH suitability)", "shelf": "theories", "surface": "secular", "snippet": "Agricultural science (yield, soil-pH suitability) — an engine domain that can touch it: agriculture. Calibration: seals — yield, spacing, seeding rates and pH suitability compute. Yield is the product", "authority_tier": "reference", "source": "The Theory Assay — calibrated, not judged (docs/THEORY_CATALOG.md)", "generated": false}, {"id": "card_theory_biochemistry_enzymes", "title": "Biochemistry & enzymes (catalysis at body temperature)", "shelf": "theories", "surface": "secular", "snippet": "Biochemistry & enzymes (catalysis at body temperature) — an engine domain that can touch it: biology. Calibration: seals — reaction rates, Michaelis–Menten kinetics and energy budgets compute. An enzy", "authority_tier": "reference", "source": "The Theory Assay — calibrated, not judged (docs/THEORY_CATALOG.md)", "generated": false}, {"id": "card_src_word_nitrogen_cycle", "title": "nitrogen cycle", "shelf": "dictionary", "surface": "secular", "snippet": "nitrogen cycle: (noun) the circulation of nitrogen; nitrates from the soil are absorbed by plants which are eaten by animals that die and decay returning the nitrogen back to the soil", "authority_tier": "reference", "source": "WordNet 3.0, Princeton University (WordNet License)", "generated": false}, {"id": "card_src_word_liquid_nitrogen", "title": "liquid nitrogen", "shelf": "dictionary", "surface": "secular", "snippet": "liquid nitrogen: (noun) nitrogen in a liquid state", "authority_tier": "reference", "source": "WordNet 3.0, Princeton University (WordNet License)", "generated": false}, {"id": "card_src_word_nitrogen_fixing", "title": "nitrogen-fixing", "shelf": "dictionary", "surface": "secular", "snippet": "nitrogen-fixing: (adjective) contributing to the process of nitrogen fixation", "authority_tier": "reference", "source": "WordNet 3.0, Princeton University (WordNet License)", "generated": false}, {"id": "card_src_port_tcp_7725_nitrogen", "title": "Port 7725/tcp — nitrogen", "shelf": "networking", "surface": "secular", "snippet": "Port 7725/tcp is assigned to nitrogen: Nitrogen Service.", "authority_tier": "reference", "source": "IANA Service Name and Port Number Registry (public domain)", "generated": false}, {"id": "card_src_port_udp_7725_nitrogen", "title": "Port 7725/udp — nitrogen", "shelf": "networking", "surface": "secular", "snippet": "Port 7725/udp is assigned to nitrogen: Nitrogen Service.", "authority_tier": "reference", "source": "IANA Service Name and Port Number Registry (public domain)", "generated": false}, {"id": "card_src_word_nitrogen_bearing", "title": "nitrogen-bearing", "shelf": "dictionary", "surface": "secular", "snippet": "nitrogen-bearing: (adjective) of or relating to or containing nitrogen — syn: nitrogenous", "authority_tier": "reference", "source": "WordNet 3.0, Princeton University (WordNet License)", "generated": false}, {"id": "card_src_drug_nitrogen_combination", "title": "Nitrogen Combination", "shelf": "medicine", "surface": "secular", "snippet": "Nitrogen Combination: a HUMAN OTC DRUG, liquid given by the oral route.", "authority_tier": "reference", "source": "openFDA / FDA NDC Directory (public domain)", "generated": false}, {"id": "card_src_book_56472", "title": "Nitrogen Bacteria and Legumes With special reference to red clover, cowpeas, soy beans, alfalfa, and sweet clover, on Illinois soils — Cyril G. (Cyril George) Hopkins", "shelf": "gutenberg", "surface": "secular", "snippet": "Nitrogen Bacteria and Legumes With special reference to red clover, cowpeas, soy beans, alfalfa, and sweet clover, on Illinois soils, by Cyril G. (Cyril George) Hopkins. Subjects: Nitrogen-fixing micr", "authority_tier": "reference", "source": "Project Gutenberg (public domain)", "generated": false}, {"id": "card_src_word_nitrogen_narcosis", "title": "nitrogen narcosis", "shelf": "dictionary", "surface": "secular", "snippet": "nitrogen narcosis: (noun) confused or stuporous state caused by high levels of dissolved nitrogen in the blood", "authority_tier": "reference", "source": "WordNet 3.0, Princeton University (WordNet License)", "generated": false}, {"id": "card_src_word_nitrogen_fixation", "title": "nitrogen fixation", "shelf": "dictionary", "surface": "secular", "snippet": "nitrogen fixation: (noun) the assimilation of atmospheric nitrogen by soil bacteria and its release for plant use on the death of the bacteria", "authority_tier": "reference", "source": "WordNet 3.0, Princeton University (WordNet License)", "generated": false}, {"id": "card_src_word_nitrogen_oxide", "title": "nitrogen oxide", "shelf": "dictionary", "surface": "secular", "snippet": "nitrogen oxide: (noun) any of several oxides of nitrogen formed by the action of nitric acid on oxidizable materials; present in car exhausts", "authority_tier": "reference", "source": "WordNet 3.0, Princeton University (WordNet License)", "generated": false}]}