查询词典 deaminase

To discuss the polymorphism of cytidine deaminase from patients with acute leukemia and the patients curative effect.

目的 探讨急性白血病病人CDA基因第1号外显子基因多态分布以及追踪随访不同基因型患者的疗效与转归。

Objective To explore the clinical significance of neuron specific enolase level and adenosine deaminase activity change in the cerebrospinal fluid of the patients with intracranial infection.

目的 探讨颇内感染性疾病患者脊液神经元特异性烯醇化酶水平和腺苷脱氨酶活性的变化及其临床意义。

Deamination of threonine by the enzyme threonine deaminase produces α-ketobutyrate.

苏氨酸被苏氨酸脱氨酶脱氨产生α-酮丁酸。

Objective］ To isolate the endophytic bacteria with high ACC deaminase activity in strawberry and enrich the endophyte resources which are benefit for the preservation of fruits and vegetables.

［目的］分离草莓体内具有较高ACC脱氨酶活性的菌种，丰富具有果蔬保鲜价值的植物内生菌资源。

Methods: Adenosine deaminase was purified by immtino-affinity chromatography, the enzyme activity was assayed colorimetrically by the measurement of ammonia produced over a fixed timeResults: The purified ADA was shown to be a homogeneity by polyacrylamide gel electrophoresis.

用免疫亲和层析法分离纯化人肾ADA，测氨法测定 ADA活性，经SDS-PAGE测定其分子量。

The codA gene encodes cytosine deaminase, which can deaminate nontoxic compound 5-fluorocytosine (5-FC) to the highly cytotoxic compound 5-fluorouracil (5-FU). 5-FU can influence the cells survival through interference with the synthesis metabolism of the RNA and DNA.

codA基因在细菌体内编码胞嘧啶脱氨酶，CD能把对细胞无毒的5-氟胞嘧啶(5-FC)脱氨成为有毒的5-氟尿嘧啶(5-FU)。5-FU通过干扰RNA和DNA的合成代谢从而影响细胞的生存。

Glioma is still one of refractory disease in the neurosurgical field; the development of new primary and adjuvant treatment is vital. Recently, the gene therapy of glioma is developed rapidly and there are many methods about the gene therapy that include: suicide gene therapy, immunologic gene therapy, drug resistangce gene therapy, angiostatin gene therapy and so on. The sucide gene therapy is the most potential approach of antitumer, these nonmammalian genes encode enzyme that convert nontoxic prodrugs into highly toxic metablites. Cells transfected with suicide genes are targeted for specific negative selection, witch can be induced by administrtion of the corresponding produg. Among the enzyme/produg combinations, two of the best characterized system are herpes simplex virus thymidine kinase /ganciclovir and Escherichia coli cytosine deaminase /5-flourocytosine (5-FC). The formor can convert the antiviral nucleoside analogs acyclovir , ganciclovir to their nucleoside monophosphate derivatives, the monophosphate forms are subsequently phosphorylated by endogenus cellular kinases to triphosphates, these molecules are potent inhibitors of DNA synthesis.

近年来脑胶质瘤的基因治疗发展迅速，应运而生的方法有自杀基因、免疫基因、多药耐药基因以及抗血管生成基因等，其中自杀基因被认为是最有前景的基因治疗方法，它又称病毒介导的酶／药物前体疗法，是利用转基因技术将哺乳动物细胞中所不含有的自杀基因转入到哺乳动物肿瘤细胞中，该基因表达的产物可将无毒的药物前体转化为毒性药物，从而选择性杀伤该肿瘤细胞，常用的自杀基因有单纯疱疹病毒-胸苷激酶基因和大肠杆菌胞嘧啶脱氨酶基因，前者催化无毒性抗病毒核苷类似物如丙氧鸟苷、无环鸟苷等成为单磷酸核苷衍生物，然后在内源性细胞激酶作用下转化为具有明显毒性的三磷酸核苷，作为DNA合成链的终止剂和DNA合成酶的抑制剂，干扰细胞DNA的合成；后者编码的胞嘧啶脱氨酶可催化5-氟胞嘧啶（5-FC）脱氨成为5-氟尿嘧啶（5-FU），然后代谢为有毒性的5-氟尿嘧啶-5′三磷酸（5-FUTP）和5-氟-2′脱氧尿嘧啶-5′磷酸（5-FdUTP），5-FUTP通过与UTP竞争性结合而抑制mRNA和tRNA的合成，5-FdUTP则作用于胸苷合成酶，导致TMP衰竭而阻止DNA的合成，最终诱导肿瘤细胞凋亡。

Suicide gene therapy is a new experimental form of cancer chemotherapy that is currently being evaluated in human trials. Cytosine deaminase is an enzyme found in a variety of bacteria and fungi where is capable of deaminating cytosine to uracil.

将某些细菌及病毒中特有的药物敏感基因转导入肿瘤细胞，使肿瘤细胞产生某些酶类，将原来无毒的抗病毒药物或化疗前体药物代谢转化成细胞毒性产物而杀伤宿主细胞，这种使肿瘤细胞自杀的基因称为&自杀基因&。

For a big chunk of credit-card losses; the number of filings (and thus charge-off rates) would be rising again, whether

年美国个人破产法的一个改动使得破产登记急速下降，而后引起了信用卡大规模的亏损。

Eph. 4:23 And that you be renewed in the spirit of your mind

弗四23 而在你们心思的灵里得以更新