1. 尿素：(1) 尿素(urea)的生成 Urea Biosynthesis1932,德国学者Hans Krebs 提出尿素循环(urea cycle)或鸟氨酸循环(ornithine调节:N-乙酰谷氨酸(AGA)为变构激活剂 意义:其活性可作为肝细胞分化程度的指标鸟氨酸循环的小结有A 位(acceptor site)和P位(donor site).活性的成熟蛋白质过程 新生肽链的折叠:折叠酶(foldase)或分子伴侣.

2. urea

2. 脲：中文: 利用荧光光谱和紫外光谱研究了脲(Urea)对牛血清白蛋白(BSA)结构的影响以及氧氟沙星(Oflx)与脲诱导的BSA结合的情况.

3. urea什么意思

3. 尿酸：对昆虫调节氮代谢作用的机制,则很少了解,尤其昆虫对蛋白质的摄取和消化作用,氨基酸吸收,最后尿酸(Urea)排泄. 其他尿囊素(Allanotin)、尿素(Urea)及氨,这些都与马氏管的生理特性有关,而马氏管主要的功能在於调节体内水分、盐类和氮等平衡状态.

4. 素：并 明此S型6) 抑制剂 (inhibitor) 与 负效应物 (negative effector) 可影响酵素活性,其差别在於后者16) 蛋白质激脢 (protein kinase) 的催化反应本身 是可逆的,因此蛋白质的磷酸化可以其27) 素 (urea) 可导致酵素变性的原

1. /u0039/u0031/u0031/u67E5/u8BE2/u00B7/u82F1/u8BED/u5355/u8BCD

1. The optimum external retting conditions were as follows: pond water abundant in pectinolytic bacteria, water temperature 30℃-35℃, ratio of flax stem to water 1:20-25 and pH 7.0-7.5, Urea added into retting water by 2% of flax stemmass. The different part, diameter and ripeness of flax had a different effect on flax retting.
    果胶分解菌含量丰富的塘水有利于亚麻脱胶，浴比1：20～25、pH 7.0～7.5、温度30～35℃有利于果胶分解菌的生长繁殖；加入适量(1.5～2.0％)的含氮物质作为脱胶助剂，能够改善亚麻的沤麻环境，提高果胶酶的活性，加快亚麻的沤麻速度。

2. A non-noble metal oxygen reduction reaction catalyst labeled as Co-C-N(800) was synthesized by heat-treating a mixture of urea, cobalt chloride and acetylene black for 2 hours at 800℃ in an inert nitrogen atmosphere.
    机械研磨尿素、氯化钴、乙炔黑混合物并经800℃高温热处理后，制备出了非贵金属Co-C-N（800）催化剂。

3. When adding excess of urea in the medium, the content of melamine in the yeast feed which produced with the optimum parameters is lower than the national standard, so there is no melamine generated in the fermentation and dry process.
    并且在培养基中添加过量的尿素，按上述工艺生产的酵母饲料中的三聚氰胺含量值低于国家标准，说明在发酵干燥过程中没有衍生出三聚氰胺。

4. Five isomers containing oxygen bridge have been prepared from different β-dicarbonyl compounds and urea/thiourea and also been characterized by 〓H NMR spectroscope, 〓C NMR spectroscope, IR spectroscope, EI/MS and elemental analyses. From this, we can see that it is a general method for preparing such tri-cyclic compounds.
    采用不同的β-二羰基化合物、脲和硫脲合成了五个含氧桥的异构体，利用〓HNMR、〓CNMR、IR、EI/MS和元素分析对上述化合物进行了结构表征，证明该异构体的合成具有一定的普遍性。

5. The reactions that isocyanate reacted to cellulose, semicellulose, lignin, and water in timber to form the urethane and urea are basic knowledge for the adhesion of isocyanate-terminated polyurethane resins to wood. It has significant meaning to understand that different quantity of urethane and urea affect the strength of adhesive bond.
    异氰酸酯基与木材中的纤维素、木素、半纤维素和水在一定条件下生成氨基甲酸酯和取代脲的反应是聚氨酯胶粘剂与木材胶接的基础反应，研究氨基甲酸酯和取代脲的生成量对胶接强度的影响具有积极的理论意义和实践指导价值。

6. urea

6. The quadratics rotary orthogonal combination design was used to conduct field experiment of integrated balanced of yard manure, urea, calcium superphosphate, potassium chloride and potassium dihydrogen phosphate fertilizer in order to increase the yield of Chinese chestnut.
    为提高板栗的产量，对圈肥、尿素、过磷酸钙、氯化钾、磷酸二氢钾等肥料，运用二次旋转正交组合设计，开展综合配套的施肥田间试验。

7. urea是什么意思

7. Five quadratic regression mathematical models were established. Some conclusions were drawn from the model: Optimization fertilization program for increase the field of Chinese chestnut are applied yard manure 12.64~13.75 kg after harvest in fruit at previous year. Potassium dihydrogen phosphate 1.56%~1.77% on bearing base shoots of per tree was sprayed in April. Urea 0.27~0.29 kg, calcium superphosphate 0.35~0.40 kg, potassium chloride 0.21~0.23 kg to per tree were applied in July
    从而建立相应的五元二次回归数学模型，获得板栗丰产的最优化施肥方案是在上一年果实采收后施圈肥12.64~13.75kg；在4月份对每株树木的结果母株喷施1.56%~1.77%浓度的磷酸二氢钾；在7月份对每株树木施尿素0.27~0.29kg、过磷酸钙0.35~0.40kg、氯化钾0.21~0.23kg

8. It was found that the retention of the three molecular conformations of Lys behaved as predicted by the SDT-R theory provided that the urea concentration remained constant in the mobile phase.
    发现在流动相中含有脲时，蛋白的保留仍服从SDT理论，可以准确测定在特定脲浓度条件下Lys的Z及logI值。

9. It was found that the retention of the three molecular conformations of Lys behave d as predicted by the SDT-R theory provided that the urea concentration remained constant in the mobile phase.
    发现在流动相中含有脲时，蛋白的保留仍服从SDT理论，可以准确测定在特定脲浓度条件下Lys的Z及logI值。

10. urea的反义词

10. Different molecular conformations, i. e., native, urea-unfolded, guanidine hydrochloride -unfolded, urea-reduced-unfolded, GuHCl-reducedunfolded of lysozyme was systematically studied by UV spectra, fluorescence spectra, RPLC, and weak-cation-exchange chromatography, and the stoichiometric parameter Z in SDT.
    以溶菌酶为目标蛋白，用紫外，荧光，RPLC，弱阳离子交换色谱及SDT中的Z值系统地研究了四种不同变性状态（胍变还原与非还原，脲变还原与非还原）的Lys的分子构象变化，并与其天然态进行了比较。

11. Antilipidic effect of unsaturated fatty acids separated from the seed kernel oil of Pinus armandi; 2. Polyunsaturated fatty acid separation from the seed kernel oil of Pinus armandi via urea clathration; 3. but little study on the seed kernel oil of pinus armandi was carried over the time.
      我国华山松分布广泛，松籽产量大，目前，关于华山松籽油的研究开发报道很少，本文对华山松籽油作了较为系统的研究，并对华山松籽油中的不饱和脂肪酸进行了提取、分离和功能评价研究，为华山松籽油的开发利用提供理论基础。

12. 好好学单词·英语单词大全

12. Two representative compounds have been determined by X-ray crystallography. The best ratio of reactants, the adequate reaction temperature and solvent have been found by contrast experiments.4. The better photoreaction conditions and irridation times have been confirmed through the different photoreaction results. It is the first time that fifty quinazoline derivatives with biological activity and four photooxidation products with urea functional groups have been obtained by photochemistry method. Two representative compounds, quinazoline derivatives and photooxidation products, have been determined by X-ray crystallography, respectively.
      通过实验对比我们找到了较佳的反应物的投料比、反应温度和反应所用的溶剂。4、根据不同条件下的光反应结果，确定了硫脲衍生物的相对较好的光反应条件和光照时间，首次利用光化学手段成功得到50个具有生物活性的喹唑啉衍生物和4个具有脲基官能团的光氧化的产物，测定了两个具有代表性的喹唑啉和光氧化的产物的晶体结构。

13. Paraffin wax was prepared from diesel by urea adduct method at 20 ℃, 40 ℃ or 60 ℃ for 2~6 hous.
      使用尿素络合法由柴油制备石蜡，在20℃、40℃、60℃下分别进行2～6h的反应，用气相色谱和差示扫描量热仪分析产品的正构烷烃组成和热性能。

14. Fatty acid methyl esters with different carbon chain length were separated by urea adduct method for providing preservation film materials for agricultural products.
      采用尿素包合法分离棕榈油甲酯化物中不同碳链长度的脂肪酸甲酯，为农产品涂膜保鲜材料的开发提供原料。

15. urea的翻译

15. The amount of linoleic acids were increased from 71% to 94% under the optimum reaction condition, which was used as a base for industrial designs and provided material for the following reaction. Experiment2:The enriched fatty acid by urea adduct method in safflower oil reacted by alkali isomerization.
      并在该工艺条件下进行验证实验，使亚油酸含量从71％增加到94％，为工艺上进行红花油亚油酸富集提供了依据，为下一步进行碱催化异构化反应生成共轭亚油酸提供高含量的混合脂肪酸原料。

16. urea

16. The orthogonal experimental design method is used to study the technological conditions of enrichment of linoleic acid methyl ester from cotton seed oil methyl ester by urea adduct method.
      采用正交实验设计，对尿素包合法富集高纯度棉籽油亚油酸甲酯的工艺条件进行研究，考察了包合温度、包合时间、尿素用量、溶剂配比等因素对产品中亚油酸甲酯含量及收率的影响，找出了最佳工艺条件：以甲醇作溶剂，脂肪酸甲酯∶尿素∶甲醇=1∶3∶8 ，包合温度为 2 0℃，一次富集产品使亚油酸甲酯的含量从 5 7。

17.

17. The fire and stone laboratory can stimulate the main and collateral channels of the human bodies and promote metabolism and teduce weight. it can also remove the CO2accumulated and urea in the body so sa to release the burden of liver and kidney.
      火玉体验室可以刺激人体经络和经穴，促进新陈代谢，排除体内不良物质；可以分解脂肪质，并排泄到体外，改善肥胖体态，减轻体重；可以排除体内淤积的二氧化碳及尿素，减轻肝脏、肾脏负担；可以改善微循环，特别对女性皮肤具有润滑、祛皱、保温、光亮富有弹性之效；可以安神镇精，能迅速解除疲劳；可以增加血管内的供氧量，分解血管内的血栓，促进血液循环，抑制病毒繁殖，增强人体抵抗能力。

18. A simple one-step procedure was described for the synthesis of mesoporous monolith and composite sphere, in which hydrolyzation of tetraethyl orthosilicate and polymerization of urea with formaldehyde occurred at the same time.
      利用酸性条件下正硅酸乙酯的水解和脲醛树脂的聚合反应同时一步原位进行的方法合成了二氧化硅复合粉体(包括核壳微球结构和网状结构)和块体凝胶材料。

19. Results During intraperitoneal injection, three rats in 8 mg/kg dosage group showed toxic reactions such as listlessness, slow reaction, dull activity, ecphysesis, unsteadily walking. Blood urea nitrogen level in 8 mg/kg dosage group was much higher than that in the normal group. Some animals had pathological injury such as degeneration, cellular necrosis and protein cast in cellular epithelislis of renal distal convoluted tubule in both 4 mg/kg dosage group and 8 mg/kg dosage group, they were more serious in 8 mg/kg dosage group.
      结果 8mg/kg剂量组有3只动物给药期间出现精神萎糜、反应迟钝、活动呆板、呼吸急促、行走不稳等毒性反应。8mg/kg剂量组大鼠血清的BUN明显升高，4，8mg/kg剂量组部分动物出现肾脏的远曲小管上皮细胞变性、坏死及蛋白管型等病理改变，以8mg/kg剂量组较为严重。

20. 911查询·英语单词

20. In the production process of urea, different proportional inorganic mineral modified additives were added to produce three kinds of modified urea.
      毛小云 ，廖宗文，吴平霄在普遍尿素的生产工艺中分别加入一定比例的无机矿物改性剂，研制出3种改性尿素。

1. the chief solid component of mammalian urine
    synthesized from ammonia and carbon dioxide and used as fertilizer and in animal feed and in plastics

    Synonym: carbamide