WorldWideScience.org Topics

Many of the entries listed in our index of topical pages are scientific acronyms or terms, for example gene sequences or chemical formulas.
Note that the topical pages presented here are a subset of the pages available by performing a search of WorldWideScience.org.
0-9 A B C D E F G H I J K L M N O P Q R S T U V W X Y Z

         n codes (N编码)
         n shell (N壳层)
         n-1535 baryons (N-1535重子)
         n-d method (N-D方法)
         n-ethyl maleimide (n-乙基马来酰亚胺)
         n-reactor (N-堆)
         naa (中子活化分析)
         nad (辅酶Ⅰ)
         nadh2 (还原型辅酶Ⅰ)
         nadp (辅酶Ⅱ)
         nagasaki (长崎)
         nahcolite (苏打石)
         nai detectors (碘化钠探测器)
         nails (指甲)
         nak (钠钾合金)
         namibia (纳米比亚)
         nanostructures (纳米结构)
         nanotechnology (纳米技术)
         nanotubes (纳米管)
         naphtha (石脑油)
         naphthalene (萘)
         naphthalic acid (萘二甲酸)
         naphthenes (环烷属)
         naphthols (萘酚)
         narcotics (麻醉品)


         nasa (国家宇航局)
         nasopharynx (鼻咽)
         national accelerator laboratory (国家加速器实验室)
         national aeronautics and space administration (国家宇航局)
         national bureau of standards (国家标准局)
         national control (国家控制)
         national defense (国防)
         national enterprises (国营企业)
         national environmental policy act (国家环境政策法规)
         national government (国家政府)
         national ignition facility (国家点火装置)
         national institute for occupational safety and health (国家职业安全和保健研究所)
         national oceanic and atmospheric administration (国家海洋和大气管理局)
         national organizations (国家机构)
         national radiological protection board (国家辐射防护委员会)
         national renewable energy laboratory (国家再生能源实验室)
         national science foundation (国家科学基金会)
         national security (国家安全)
         national synchrotron light source (国家同步辐射光源)
         nationalization (国有化)
         nato (北大西洋公约组织)
         natural activity (天然活度)
         natural analogue (自然模拟)
         natural attenuation (固有衰减)
         natural circulation (自然循环)



         nauru (瑙鲁)
         nausea (恶心)
         naval research laboratory (海军研究实验室)
         navier-stokes equations (纳维-斯托克斯方程)
         navigation (航行)
         navigational instruments (导航仪表)
         ncsr (国家系统可靠性中心)
         ndpp (对-硝基二甲基氨基苯丙酮-盐酸)
         nea (核能机构)
         near infrared radiation (近红外辐射)
         near ultraviolet radiation (近紫外辐射)
         nebraska (内布拉斯加州)
         nebulae (星云)
         neck (颈部)
         necrosis (坏死)
         neel point (尼尔点)
         neel temperature (尼尔温度)
         negative energy states (负能态)
         negative ions (负离子)
         negative mass (负质量)
         negatons (负电子)
         negatrons (负电子)
         negotiation (谈判)
         nem (N-甲基顺丁烯二酰亚胺)
         nemata (线虫门)


         nematodes (线虫纲)
         nembutal (戊巴比妥钠)
         neoclassical transport theory (新经典输运理论)
         neodymium (钕)
         neodymium 147 (钕-147)
         neodymium complexes (钕配合物)
         neodymium compounds (钕化合物)
         neodymium hydroxides (氢氧化钕)
         neodymium ions (钕离子)
         neodymium isotopes (钕同位素)
         neodymium oxides (氧化钕)
         neodymium perchlorates (高氯酸钕)
         neodymium silicides (硅化钕)
         neogene period (新第三纪)
         neomycin (新霉素)
         neon (氖)
         neon ions (氖离子)
         neon isotopes (氖同位素)
         neonates (新生儿)
         neopentane (新戊烷)
         neoplasms (肿瘤)
         neoprene (氯丁橡胶)
         nepa (国家环境政策法规)
         nepal (尼泊尔)
         nephrectomy (肾切除术)


         nephritis (肾炎)
         nephrosclerosis (肾硬变)
         nepotism (裙带关系)
         neptune planet (海王星)
         neptunium (镎)
         neptunium 237 (镎-237)
         nernst effect (能斯脱效应)
         nerve cells (神经细胞)
         nerve tissue (神经组织)
         nerves (神经)
         nervous system (神经系统)
         nervous system diseases (神经系统疾病)
         nests (巢)
         net energy (净能量)
         net trade (纯贸易)
         netherlands (荷兰)
         netherlands antilles (荷属安的列斯群岛)
         network analysis (网络分析)
         networks computer
         neumann series (诺伊曼级数)
         neural networks (神经网)
         neurology (神经病学)
         neuron transmission (神经元传导)
         neurons (神经元)
         neurospora (脉孢菌属)




         neutrons (中子)
         neutrophils (嗜中性白细胞)
         nevada (内华达州)
         new brunswick (新布伦兹维克省)
         new caledonia (新喀里多尼亚)
         new england (新英格兰)
         new guinea (新几内亚岛)
         new hampshire (新罕布什尔州)
         new jersey (新泽西州)
         new mexico (新墨西哥州)
         new south wales (新南威尔士)
         new york (纽约州)
         new york city (纽约市)
         new zealand (新西兰)
         newborns (新生儿)
         newcastle disease (纽卡塞尔病)
         newfoundland (纽芬兰省)
         newton mechanics (牛顿力学)
         newton method (牛顿法)
         newts (水螈)
         next european torus (第二欧洲环)
         ngl (天然气液态产物)
         ni-hard (镍铬冷硬铸铁)
         niacin (尼克酸)
         niagara river (尼亚加拉河)


         nicaragua (尼加拉瓜)
         nichrome (尼赫罗姆合金)
         nickel (镍)
         nickel 48 (镍-48)
         nickel 52 (镍-52)
         nickel 54 (镍-54)
         nickel 63 (镍-63)
         nickel 66 (镍-66)
         nickel alloys (镍合金)
         nickel base alloys (镍基合金)
         nickel borides (硼化镍)
         nickel carbides (碳化镍)
         nickel complexes (镍配合物)
         nickel compounds (镍化合物)
         nickel hydroxides (氢氧化镍)
         nickel ions (镍离子)
         nickel ores (镍矿石)
         nickel oxides (氧化镍)
         nickel phosphates (磷酸镍)
         nickel phosphides (磷化镍)
         nickel silicides (硅化镍)
         nickel silver (镍银)
         nickel sulfides (硫化镍)
         nickel-cadmium batteries (镍-镉电池组)
         nickel-chromium steels (镍-铬钢)



         nina (NINA加速器)
         ninhydrin (水合茚三酮)
         niobates (铌酸盐)
         niobium (铌)
         niobium additions (铌添加物)
         niobium alloys (铌合金)
         niobium carbides (碳化铌)
         niobium compounds (铌化合物)
         niobium ions (铌离子)
         niobium oxides (氧化铌)
         niobium silicides (硅化铌)
         niobium tellurides (碲化铌)
         niosh (国家职业安全和保健研究所)
         niper (国家石油和能源研究所)
         nippostrongylus (毛园线虫)
         nitella (丽藻属)
         nitinol (镍钛诺)
         nitrates (硝酸盐)
         nitration (硝化)
         nitric acid (硝酸)
         nitric acid esters (硝酸酯)
         nitric oxide (一氧化一氮)
         nitridation (氮化)
         nitrides (氮化物)
         nitrification (硝化作用)


         nitriles (腈)
         nitrilotriacetic acid (次氮基三乙酸)
         nitrites (亚硝酸盐)
         nitro compounds (硝基化合物)
         nitrobenzene (硝基苯)
         nitrocellulose (硝化纤维素)
         nitrogen (氮)
         nitrogen 10 (氮-10)
         nitrogen 11 (氮-11)
         nitrogen 12 (氮-12)
         nitrogen 13 (氮-13)
         nitrogen 14 (氮-14)
         nitrogen 15 (氮-15)
         nitrogen 17 (氮-17)
         nitrogen 18 (氮-18)
         nitrogen 19 (氮-19)
         nitrogen 20 (氮-20)
         nitrogen 21 (氮-21)
         nitrogen 23 (氮-23)
         nitrogen 24 (氮-24)
         nitrogen 25 (氮-25)
         nitrogen additions (氮添加物)
         nitrogen compounds (氮化合物)
         nitrogen cycle (氮循环)
         nitrogen dioxide (二氧化氮)


         nitrogen fixation (固氮)
         nitrogen ions (氮离子)
         nitrogen isotopes (氮同位素)
         nitrogen mustard (氮芥)
         nitrogen oxides (氧化氮)
         nitrogenase (固氮酶)
         nitrogenases (固氮酶)
         nitroglycerin (硝化甘油)
         nitromethane (硝基甲烷)
         nitrophenol (硝基苯酚)
         nitroreductases (硝基还原酶)
         nitrosamines (亚硝胺)
         nitroso compounds (亚硝基化合物)
         nitroso-r salt (亚硝基R盐)
         nitrosoureas (亚硝基脲)
         nitrous acid (亚硝酸)
         nitrous oxide (一氧化二氮)
         nitroxyl radicals (硝酰基)
         nk cells (自然杀伤细胞)
         nmr (核磁共振)
         nmr imaging (核磁共振成像)
         nmr logging (核磁共振测井)
         nmr spectra (核磁共振谱)
         nmr spectrometers (核磁共振谱仪)
         no 2 fuel oil




         norepinephrine (降肾上腺素)
         normal-mode analysis (简正模分析)
         north america (北美洲)
         north atlantic region (北大西洋地区)
         north atlantic treaty organization (北大西洋公约组织)
         north carolina (北卡罗来纳州)
         north dakota (北达科他州)
         north korea (朝鲜民主主义人民共和国)
         north sea (北海)
         north yemen (北也门)
         north-south asymmetry (南-北不对称性)
         northern hemisphere (北半球)
         northern ireland (北爱尔兰)
         northern territory (北领地)
         northwest territories (西北领地)
         norway (挪威)
         nose (鼻)
         nose cones (头锥)
         notches (切口)
         notices (通知)
         nova scotia (新斯科舍省)
         novae (新星)
         novain (肉碱)
         novaya zemlya (新地岛)
         novocaine (奴佛卡因)





         nucleation (成核)
         nuclei (核)
         nuclei cells
         nucleic acid hybridization (核酸杂化)
         nucleic acid replication (核酸复制)
         nucleic acids (核酸)
         nucleogenesis (核起源)
         nucleoli (核仁)
         nucleon-nucleon interactions (核子-核子相互作用)
         nucleon-nucleon potential (核子-核子势)
         nucleons (核子)
         nucleoproteins (核蛋白)
         nucleosides (核苷)
         nucleosomes (核小体)
         nucleosynthesis (核合成)
         nucleotides (核苷酸)
         nuclides (核素)
         number codes (数字编码)
         numerical analysis (数值分析)
         numerical data (数值数据)
         numerical solution (数值解)
         nunavut (努纳武特)
         nusselt number (努塞尔特数)
         nutrients (营养物)
         nutrition (营养)


         nutritional deficiency (营养不良)
         nuts (坚果)
         nuts mechanical
         nylon (尼龙)
         nymphs (若虫)