منابع مشابه
[Current research status of Vitreoscilla hemoglobin and the prospective application in traditional Chinese medicine].
透明颤菌是一种专性好氧的革兰氏阴性丝状 菌 ,属于贝日阿托氏菌属 ( Beg gia toe ) , 在沼泽、腐 烂植物等贫氧的环境中生长旺盛。V H b 在透明颤 菌中被发现 , 最初被认 为是“细胞 色素 o ( cytochrome o, Cyo)”蛋白 , 具有末端氧化酶的性质 [ 2 ] 。 Cyo 在不同的环境条件下可呈现三种不同的状态 , 即氧化态、还原态、氧合态 ,并可以相互转化 ; 其中还 原态是生理活性态 , 而氧合态则是富氧条件下的表 现形式。它在 577、544 和 420 nm 处有最大吸收峰 , 若向溶液中鼓入 CO 气体 , 则可形成蛋白-CO 复合 物 ,在 566、535 及 419 nm 处呈现特征吸收峰 [ 3 ] 。但 是随着 1983 年真正的 Cyo 的分离和确定 [ 4 ] , 实验 表明该蛋白在光谱学和氧结合动力学性质上与氧合 肌红、血...
متن کامل[Dll4/Notch signaling pathway and tumor angiogenesis.].
Dll4是定位于人染色体15q14、基因编码长度为685 个氨基酸的单链跨膜蛋白。它在进化过程中高度保守, 人和鼠Dll4基因编码的蛋白具有87%的同源序列。Dll4 的胞外段含有与Notch受体结合必需的8个表皮生长因子 (epidermal growth factor, EGF)样重复序列、4个潜在的 糖基化位点和1个由45个氨基酸组成的保守DSL(Delta, Serrate, Lag2)结构域。 Dll4通过与相邻细胞膜上的Notch1或Notch4受体相 互结合,使Notch受体经过一系列蛋白酶裂解。这个过 程主要包含2个蛋白酶,即肿瘤坏死因子α转换酶(tumor necrosis factor α-converzyme, TACE)和早老素(presenilin) 或称为γ-分泌酶(γ-secretase),受体裂解后释放出活化 形式的胞内区域(notch intrace...
متن کاملStudies of casein micelle structure: the past and the present
At the heart of the milk system are the colloidal casein-calcium-transport complexes termed the casein micelles. The application of physical chemical techniques such as light, neutron, and X-ray scattering, and Electron Microscopy (EM) has yielded a wealth of experimental detail concerning the structure of the casein micelle. From these experimental data bases have arisen two conflicting models...
متن کاملStacking Heterogeneous Joint Models of Chinese POS Tagging and Dependency Parsing
Previous joint models of Chinese part-of-speech (POS) tagging and dependency parsing are extended from either graphor transition-based dependency models. Our analysis shows that the two models have different error distributions. In addition, integration of graphand transition-based dependency parsers by stacked learning (stacking) has achieved significant improvements. These motivate us to stud...
متن کاملDegradation and biosynthesis of terpenoids by lactic acid bacteria isolated from cheese: first evidence
The aim of this study was to investigate whether lactic acid bacteria (LAB), isolated from cheese, were able to degrade terpenes. Five strains of LAB were grown on M17 and reconstituted skim milk in the presence of alpha-pinene, beta-myrcene, alphaterpineol, myrtenal, and alpha-campholenal. Cultures were incubated at 37 °C and samples collected at 6, 24, and 48 h for analysis by headspace-solid...
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ژورنال
عنوان ژورنال: Chinese Science Bulletin
سال: 1994
ISSN: 0023-074X
DOI: 10.1360/csb1994-39-21-1971