脲

The studies segmented polyester polyurethaneurea elastomers based on 4,4'-diphenylmethane diisocyanate, ethylene diamine and polybutylene adipate (M. W. 1975 and M. W. 1228) were studied by means of IR spectrascopy.

用红外光谱法对基於4，4'-二苯基甲烷二异氰酸酯、乙二胺和聚己二酸丁二醇酯（分子量分别为1975和1228）的嵌段聚脲氨酯弹性体进行了研究。

Hydrogen bonding in hard segment domains of segmented polyester polyurethaneurea based on 4,4'-diphenylmethane diisocyanate, ethylene diamine and polybutylene adipate(M. W. 1975 and M. W. 1228) was studied by means of IR spectroscopy.

用红外光谱法对基於4，4'-二苯基甲烷二异氰酸酯、乙二胺和聚己二酸丁二醇酯（分子量分别为1975和1228）的两系列嵌段聚酯型聚脲氨酯硬段微区中的氢键化进行了研究。

Urea-formaldehyde resins has many advantages such as abundant raw materials, low cost, good agglutinative performance and so on,are most widely used adhesives.

中文摘要：脲醛树脂胶粘剂具有原料丰富、成本低廉、粘结性能好等优点，是木材工业中使用量最大的胶粘剂。

A primer was designed based on the conserved regions of other MBL plants agglutinin through homology alignment.

盐酸胍较脲可产生更强的变性作用。

Herein, three kinds of reaction type of gelators, methylbenzene–2, 4–bis (N, N'–alkyl) urea derivatives were synthesized by using high reactivity of isocyanate and alkylamine.

利用甲苯二异氰酸酯与烷基胺的高反应活性，制备了三种不同烷基链长的反应型凝胶剂甲苯–2， 4–二脲。

METHODS: Adult male Wistar rats, 9 weeks of age, were injected intraperitoneally with STZ to create diabetes. At 2 week after the models were created, BDNF protein was administered into the vitreous cavities of rats. At 4 week after the models were created, the rats were killed and the retina was removed for Western blotting and Whole-mount immunohistochemistry for TH to observe the changes of TH and dopaminergic amacrine cells in retina.

9周龄Wistar大鼠，链脲佐菌素（streptozotocin，STZ）腹腔注射，制成糖尿病模型，于模型建立2wk后，大鼠眼玻璃体内注射BDNF溶液，于模型建立4wk后，处死大鼠，取出眼球，取视网膜组织进行Western blotting及视网膜铺片免疫组织化学染色检测，观察视网膜中TH水平的变化，从而反映糖尿病大鼠视网膜中多巴胺能无长突细胞水平的变化。

A cultured experiment is conducted in laboratory to study the effect of weathered coal and boron on the ammonification and nitrification of urea and on phosphourus availability.

氮肥中脲酶抑制剂和硝化抑制剂的应用，是提高氮肥利用率比较成功的例子。

Imidocarb ; piroplasmosis ; anaplasmosis ; safety test ; cattle ; buffalo ; goat ; horse

咪唑苯脲；梨形虫病；无定形体病；安全试验；黄牛；水牛；羊；马

The yield of the 3, 4-dihydropyrimidine-2(1H)-one was up to 95.4% under mole ratio of anisaldehyde, methyl acetoactate and urea is 1:2:5, ion-exchange membrane is 3 g, ethyl alcohol as solvent and refluxing for 2 h.

当对羟基苯甲醛、乙酰乙酸甲酯与脲的摩尔比为1：2：5，乙醇作溶剂，3 g离子交换膜，回流2 h，产物收率达95.4%。

Methoxycarbonyl-4-(4-methoxyphenyl )-6-methyl-3, 4-dihydropyrimidine-2(1H)-one was synthesized from anisaldehyde, methyl acetoactate and urea in presence of HF-1O1 strong acidic ion-exchange membrane.

在HF-101强酸性离子交换膜的存在下，由对羟基苯甲醛、乙酰乙酸甲酯与脲一步合成了5－甲氧羰基－4－（4－甲氧苯基）－6－甲基－3，4－二氢嘧啶－2(1H)－酮。

In the negative and interrogative forms, of course, this is identical to the non-emphatic forms.

。但是，在否定句或疑问句里，这种带有"do"的方法表达的效果却没有什么强调的意思。

Go down on one's knees;kneel down

屈膝跪下。。。下跪祈祷