交替发生

Similarly, the acyl-oxygen cleavage of MG mainly occurs at theleast hindered carbonyl group and alternating D,L-PLGA50 wasobtained.

同样，MG单体的开环主要发生在位阻较小的羰基一侧〓，合成了窄分子量分布的聚乳酸-交替-聚乙醇酸共聚物。

In which the taxa and the formation of elements in the event that there are different degrees of relevance, in the geographical distribution of the performance space for a variety of duplication, or showed a certain alternating sequence.

其中各分类单元在发生和形成因素上有不同程度的相关性，在地理分布上表现为多种空间上的重复，或呈一定顺序的交替出现。

In organisms showing ALTERNATION OF GENERATIONS, the gametes may be produced by mitosis in the haploid generation, or by meiosis in the diploid generation and give rise directly to gametes or gamete-producing cells.

在表现出明显世代交替的生物体中，配子可能是由单倍体世代发生有丝分裂产生，亦可由二倍体世代减数分裂直接产生配子体或配子母细胞。

NBTI effects can also be influenced by ratio of signal and vacancy. The dynamic characteristics in NBTI degradation was revealed under action of negative and positive gate voltage, degradation can be recovered by positive gate voltage stress.

在负-正-负栅压交替作用下PMOSFET器件中会呈现退化-钝化-退化的动态作用过程，正栅压作用下的PMOSFET器件特性退化会有一定程度的恢复，这是由于在正栅压作用下NBTI反应产物逆向向Si／SiO〓界面处运动从而发生钝化作用造成的。

Please Huanyi cabinet put some low-heel shoes, shoes that turn, can help reduce the incidence of thumb bursitis, bone and joint are stretched for space and time.

请在换衣柜里放置一些低鞋跟的鞋，这样交替穿鞋，可以帮助减少拇囊炎的发生，让骨关节有伸展的空间与时间。

Methodssixty four patients were randomly divided into two groups, a and b, with 32 patients in each group. dobell solution was given to those in group a for gargle, six times a day; for those in group b, 50 g/l sodium bicarbonate and dobell were applied for gargle alternatively, six times a day. the infection was observed one and two weeks later.

随机抽取大剂量化疗后成年白血病住院病人64例，随机分成a、b两组，各32例。a组给予多贝尔液漱口，b组给予多贝尔液及50 g/l碳酸氢钠液交替漱口，每天6次。1、2周后观察两组口腔真菌感染发生情况。

Male gametogenesis is one of the key steps in plant sexual reproduction and is essential for the alternation between the diploid sporophytic phase and haploid gametophytic phase in the life cycle of higher plants.

植物雄配子体发生和发育是有性生殖的关键步骤之一，是高等植物通过有性生殖进行世代交替所必需的。

The electron and hydronium in Silver halide minicrystal produce alternate independence repeat move,form develop center.

胶片感光乳剂层中的感光物质卤化银在受到光辐射后，产生光化学反应，卤化银微晶中的电子和离子发生交替独立的重复迁移，而形成显影中心，无数个显影中心，构成潜影。

But being different from the others, drainage of the peripancreatic infection after the occurrence of SPI is very difficult, which needs many times of operation. Especially, the infection can be a vicious cycle, in which the systemic septicemia can be caused by localized infection or vice versa.

实际上，许多疾病的发生、发展和预后均与肠源性感染密切相关，但是SPI的特殊性在于发生感染后难以进行有效的手术引流、常常需要多次手术和多次置管引流，而且全身性败血症和局部感染交替出现，成为恶性循环。

It has also been discovered that, before complete purification, the synthetic HWTX-Ⅰ, after oxidative treatment, showed wider and more asymmetric peaks than the native HWTX-Ⅰ that was denatured and then renatured under the same experimental conditions, which suggests that there is even greater conformational unhomogeneity in the synthetic HWTX-Ⅰ.

推测除了在合成HWTX-Ⅰ复性过程中有少数分子发生二硫键错配外，还有部分分子在固相合成中发生了消旋作用，需要交替采取多种色谱法才能完全分离纯化复性后的合成多肽产物。

Cynanchum Lingtai apricot production in the average weight 65 grams, the brightly-colored fruit, juicy rich, sweet-sour taste, sweet from the nucleolus, when the late Qing Dynasty famous Shaanxi, Gansu provinces, the Qing imperial court Tongzhi tribute for years.

灵台生产的牛心杏平均单果重65克，果实色泽鲜艳，汁多味浓，甜酸适口，离核仁甜，清末时就驰名陕、甘两省，清同治年间曾为朝廷贡品。

Chenopodium album,Solanum nigrum, and Amaranthus retroflexus were very susceptible to the herbicides. Polygonum persicaria and Abutilon theophrasti were relatively less susceptible to the herbicides, and Lycopersicon esculentum was not susceptible to it. The relationship between reduction rates of weed biomass and PPM values of weed leaves 2,4, and 6 days after treatment was established.

供试的6种杂草对该混剂的敏感性存在显著差异：红心藜Chenopodium album、龙葵Solanum nigrum和反枝苋Amaranthus retroflexus对该混剂最敏感，ED90值分别为47.65、71.67和29.17g/hm2；春蓼Polygonum persicaria和苘麻Abutilon theophrasti敏感，ED90值分别为96.91、114.20g/hm2；而番茄不敏感。