活底

词组短语

false bottom

与活底相关的网络例句 [注：此内容来源于网络，仅供参考]

Chemical modification of the xylanase with NBS and WRK revealed that trytophan and glutamate/aspartate were essential for the activity. 3.0 mgmL^(-1) birchwood xylan could completely inhibit the inactivation of xylanase by NBS.

木聚糖对NBS的修饰有抑制作用，3.0mgmL^(-1)的桦木木聚糖底物可完全阻止NBS对耐热木聚糖酶的修饰作用，但木聚糖底物不能阻止WRK对耐热木聚糖酶的失活作用。

In Chapter 2 of this thesis, the kinetic equation of substrate reaction in presence of denaturant has been derived. A re-examination of the effect of high concentrations of guanidine hydrochloride on the inactivation of papain, taking into consideration the effect of high concentrations of guanidine hydrochloride on the Michaelis constant, showed that, for papain, the substrate gives no protection on its inactivation.

我们在第二章中推导了变性剂存在下的底物反应动力学方程，并在考虑了高浓度盐酸胍对酶催化反应米氏常数的影响的前提下，根据推导的动力学方程重新分析了盐酸胍存在下木瓜蛋白酶的失活动力学，结果表明底物对木瓜蛋白酶的失活没有保护作用。

Since the dismutation of superoxide radicals by SOD is a reaction that is rate-limited by diffusion and enhanced by electrostatic guidance, all these structural features may be related to GP-MnSOD's high catalytic activity: first, Lys38 may increase the effective enzyme-substrate association rate by enhancing the electrostatic gradient at its substrate channel; second, an excess of acidic over basic residues makes the negative surface potential of GP-MnSOD more larger than those of other known MnSODs. This may enhance the reaction rate by reducing futile collisions of superoxide radicals with GP-MnSOD's surface.

因此，GP-MnSOD的上述结构特征可能与GP-MnSOD的较高酶活有关：首先，Lys38增加了底物通道口的正静电势梯度，从而可能促进了GP-MnSOD的活性中心与底物的有效结合速率；其次，GP-MnSOD表面覆盖的过量酸性残基使得它比其它MnSOD在底物通道以外的蛋白表面更多地被负静电势所覆盖，这可能有效地减少了超氧阴离子与GP-MnSOD表面的无效碰撞，从而提高了反应速率。

On the basis of the kinetic equation of substrate reaction in the presence of urea or guanidine hydrochloride, all microscopic kinetic constants for the free enzyme and enzyme-substrate binary and ternary complexes have been determined. The results of the present studies indicate that:①In the presence of urea or guanidine hydrochloride, enzyme-substrate complexes lose their activity less rapidly than the free enzyme. Therefore, both substrates, NADPH and 7, 8-dihydrofolate, protect dihydrofolate reductase against inactivation.②The denaturation of dihydrofolate reductase by urea follows single-phase kinetics, and changes in enzyme activity and tertiary structure proceed simultaneously in the unfolding process, so it may be an"all or none"process.③The GdnHCl-induced unfolding of the dihydrofolate shows a biphasic transition, while the change in the enzyme activity is a single exponential process. The rate constant of inactivation is consistent with that of the fast conformational change. Therefore, the kinetic intermediate of protein unfolding should be a partially folded and inactive form.

我们根据在脲或盐酸胍存在下的底物反应动力学方程求得游离酶和酶底物二元、三元复合物的微观动力学常数，结果表明：①酶-底物二元、三元复合物的失活速度明显慢于游离酶，说明两个底物二氢叶酸和NADPH对酶的失活都具有一定程度的保护作用；②在脲作用下，酶的失活和构象变化均为单指数项过程，而且酶的活力丧失和三级结构变化是同时发生的，说明二氢叶酸还原酶的脲变性可能是一个"全或无"的两态过程；③在盐酸胍作用下，酶的构象变化为两相过程，而失活则是单指数项过程，酶分子构象变化的快相速度常数与失活速度常数基本一致，因此我们认为二氢叶酸还原酶的盐酸胍变性过程中存在一个没有活力、但仍具备一定空间结构的变性中间体。

Main contents and conclusions are: 1 The ionization current was measured continuously by a charge-integration method with a computer after the introduction of radon into the chamber.

主要内容及结论：1充氡后利用计算机连续进行电离电流累积测量，得到了精细的电流随时间的变化曲线，可清楚看出氡及其子体的生成衰变造成的电离电流的生长—稳定—衰减过程，与理论计算值进行了比较，由电离电流衰减速度的变化得出氡吸附作用的影响，并测量到电离室冲洗后氡的反扩散现象；2由已知活度的标准源定出相对测量的刻度系数K值，K=24.62 Bq／pA，对同一个监测源以半年为周期进行多次测量后得出稳定性符合要求；3通过测量电离电流和气压的关系曲线以及不同气压下的饱和曲线，确定了常规的工作条件；4测量了盐酸清洗电离室内表面降低本底的效果；5不确定度分析表明相对测氡的扩展不确定度(k=2)小于5％，由本底涨落得出探测下限为0.5 Bq；6理论上对壁损失修正进行了计算，实验上保持电离室工作在饱和区的情况下，测量了不同气压下电离电流的变化，从中得出了壁损失随气压变化的规律，可以看出，电离电流的实测值和计算值随气压变化规律基本一致；当气压大于125 kPa时，端效应等其它因素造成的影响不大于2％，因而在此工作条件下，测量电离电流后通过计算修正壁损失可以实现近似的绝对测氡，提出了进一步提高绝对测量准确度的方法。

In this research, the activities of CWDE were measured by saccharifying according to the theory that red-brown amino compounds were produced when 3, 5-dinitro salicylic acid and aldehyde were heated together. And the testing conditions were made clear. The activity of Cx should be tested with optimal temperature of 50℃, optimal pH of 4.8, incubation time of 30 min, and optimal substrate of 0.6% CMC-Na. Due to the heat-libality, Cx should be sterilized more than 10 min. The testing conditions of the activity ofβ-G were almost the same with Cx except the substrate of 0.5% salicin and the sterilization time of more than 15 min.

主要取得了一下成果：(1)明确了条锈菌细胞壁降解酶活性测定的条件：羧甲基纤维素酶活性的测定条件为50℃，pH4.8，反应时间30min，底物浓度为0.6%羧甲基纤维素钠，以DNS法测定，且失活酶液的灭活时间应大于10min；β-葡萄糖苷酶活性的测定条件为：50℃，pH4.8，反应时间30min，底物浓度为0.5%水杨苷，以DNS法测定，且失活酶液的灭活时间应大于15min；果胶酶活性的测定条件为：50℃，pH4.8，反应时间1h，底物浓度为0.25%果胶，以DNS法测定，且失活酶液的灭活时间应大于10min。

Following studies had been performed:(1)repetitive WLT and real-time ultrasonography had been performed to 18 HS and 40 FD toassess the reproducibility and influencing factors.(2) correlations of WLT with symptomscore and electrogastrography had been analysed.(3) differences ofWLT between HS and FD had been compared.(4) methophenolane andimmunohistochemistry stain of gastric fundus mucosa biopsy from 40 FD patients hadbeen performed to analyse the correlations of symptom score and WLT with count andactivity of mast cells, 5-HT level, and H.Pylori infectious status.(5) the effect of oralsumatriptan to proximal stomach function in 10 HS and 10 FD had been assessed, so as toestablish the possible regulating mechanism of fundic relaxation, explore the therapeuticpotential and feasibility of sumatriptan on FD.Results:I. Evaluation of WLT and its application in FD management.

我们主要进行以下几个方面的研究：(1)对18名健康人及40名FD患者重复进行水负荷试验并结合B超声对近端胃的实时监测，评价水负荷试验结果的可靠性并分析其影响因素；(2)观察水负荷试验结果与症状积分及体表胃电结果的相关性；(3)比较FD患者和健康成人水负荷试验结果的差别；(4)对40名FD患者胃底粘膜活检组织进行免疫组化染色和甲苯胺蓝染色，观察FD患者的症状及水负荷试验结果与胃底粘膜肥大细胞、5-HT表达情况及H.pylori感染情况的相关性：(5)观察口服舒马曲坦对10名健康人及10名FD患者近端胃功能的影响，并由此推测胃底舒张运动调节的生理机制，探讨口服舒马曲坦治疗FD的可行性。

Summarized the experience of U-type reverse gastroscope biopsy so as to enhance the diagnosis level of gastric fundus disease.

总结U型反转胃镜方法活检胃底病变的经验，提高胃底病变的诊断水平。

We also strongly suggest that the recently reported chaperone acitivity of periplasmic PDI-ase and PPIase assayed by traditional substrate should be reexamined using periplasmic proteins as substrate due to the significant difference between those two classes of proteins, the possible chaperone fuctions of PDIase and PPIase in vivo should be reappraised.

同时，由于本实验结果显示膜间质蛋白与常用的分子伴侣测活底物蛋白在聚集行为上存在极显著的区别，我们建议对最近报导的膜间质蛋白二硫键异构酶和脯氨酸顺反异构酶分子伴侣活性以膜间质蛋白为底物再进行验证，对其在膜间质是否发挥分子伴侣功能重新慎重考虑。

The superstructure uses the standard drawing, the substructure has used the gravity T-shape abutment and the rectangular buttress, in the design carries on the size to the abutment and the bridge pier to draw up, simultaneously satisfies the design the principle, the abutment uses 9.3m, in satisfies the structure and under the operation requirements premise, the abutment uses 9.3m to be long, because the geological condition decided, the pillar body uses 12m to be high, the open excavation foundation, the process load computation and the load combination, has carried on the bridge abutment and the pillar bottom section stress separately to the abutment and the bridge pier examines calculated, examines calculated the result conforms to the standard requirement, the bridge span uses the straight line build, and established this bridge construction organization plan, including the engineering project characteristic, the construction plan, the job practice, the bridge building construction technology, the measure has drawn up the top cap and the tray structure and matches the muscle chart, finally has drawn up Shui Xigou the bridge overall and the horizontal plan.

内昆铁路水溪沟大桥，中心里程为DK608+393.00，该桥的设计方案有三个，通过技术、经济比较，采用4×32m预应力混凝土简支梁桥方案，桥梁全长149.5m，I级单线铁路，设计时速为120km/h，设计荷载为中活载。上部结构采用标准图，下部结构采用了重力式T 形桥台和矩形桥墩，设计中对桥台和桥墩进行了尺寸拟定，在满足构造和使用要求的前提下，桥台采用9.3m长，由于地质条件决定，墩身采用12m高，明挖基础，经过荷载计算和荷载组合，对桥台和桥墩分别进行了台底和墩底截面应力的检算，检算结果符合规范要求，桥跨采用直线布设，并且编制了该桥的施工组织设计，其中有工程项目的特征、施工方案、施工方法、桥梁工程施工技术，措施绘制了顶帽及托盘构造及配筋图，最后绘制了水溪沟大桥的总体及平面图。

与活底相关的网络解释 [注：此内容来源于网络，仅供参考]

dipper door：铲斗底门,铲斗活底,汲器可开的底

dipper capacity 铲斗容量,斗容量 | dipper door 铲斗底门,铲斗活底,汲器可开的底 | dipper dredger 单斗挖泥机,铲斗挖泥船

false bottom retort：假底甑

false bottom 假底,活底 | false bottom retort 假底甑 | false branching 假分枝

Car gondola：活底高边货车,无盖货车

Cargo liner 定期运货汽车 | Car gondola 活底高边货车,无盖货车 | Cargo room 货舱

Car gondola：活底高边货车内六角螺钉,无盖货车

Cargo liner 定期运货汽车 | Car gondola 活底高边货车内六角螺钉,无盖货车 | Cargo room 货舱

bottom-dump hauler：底卸拖运车

bottom-dump bucket 活底铲斗 | bottom-dump hauler 底卸拖运车 | bottom-dump truck 底卸车

railroad hopper car：铁路运输活底车

railroad hauling car 轨道牵引车 | railroad hopper car 铁路运输活底车 | railroad intermodal yard 铁路换装站场

Providence College：底特律活 塞吉姆-沃克

1968 NBA 圣地亚哥火箭 埃尔文-海耶斯 University of Houston | 1967 NBA 底特律活 塞吉姆-沃克 Providence College | 1966 NBA 纽约尼克 斯卡则-拉塞尔 University of Michigan

drop bottom：活底

drop ball 落锤 | drop bottom 活底 | drop forging 落锤锻造

drop bottom car：底开门车

drop bottom bin 活底箱(与叉车配合使用). | drop bottom car 底开门车. | drop box [纺]升降梭箱.

drop bottom bin：活底箱(与叉车配合使用)

drop bolt 埋头螺 栓. | drop bottom bin 活底箱(与叉车配合使用). | drop bottom car 底开门车.