part of these changes are due to antigenic drift, alterations caused by spontaneous mutation, producing minor changes in the antigenic structure of hemagglutinin.

antigenic drift of h_9n_2 subtype avian influenza viruses in henan province during 1998-2002

1998～2002年间河南省H9N2亚型AIV的抗原性漂变研究

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objective: understand influenza b viruses circulating and antigenic drift and distributing since 2003 in ningbo city.

目的：了解近年来宁波市乙型流行性感冒病毒流行和抗原性的变异情况及种系分布。

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objective to study pandemic type of influenza viruses in the human population and early discover new antigenic drift strain.

目的了解人群中流感流行的流感病毒型别，及时发现新的变异株。

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owing to error-prone polymerase and segmented genome of influenza virus, there is common phenomenon of mutations ( antigenic drift) and reassortment ( antigenic shift) for influenza virus and emergence of new variants or strains.

由于其易于出错的聚合酶和片断化基因，流感病毒基因突变（抗原漂移）、重配（抗原转移）而产生新病毒株的现象非常普遍。

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under the programme, the hkmc notes will be sold from time to time by tender to a group of market makers and recognized dealers appointed by the hkma.

根据是项计划，按揭证券公司票据将以不定期招标方式售予金管局指定的市场庄家及认可交易商。

provided by jukuu

" he was a pillar of what you hope for in a player-loyal, committed, honest and a man of integrity," the manchester united manager wrote in his programme notes for yesterday's match.

“他拥有你想要的球员的一切品质&忠诚、正直，”弗格森在昨天的比赛简报中这样写道。

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insufficiency of the heart qi, deficiency and decline in the kidney essence, lack of nourishment in the brain and mental derangement are the internal factors in ad.

心气不足，肾精虚衰.脑失所养，神不归舍是AD发病的内在原因；

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objective: to investigate and analyze the mental derangement of patients with leukemia so as to find effective psycho-nursing methods.

目的调查分析白血病患者的心理障碍，寻求有效的心理护理方法。

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derivations of beckmann's allometric growth equation from beckmann ′ s class-size model of city hierarchies

Beckmann城市体系异速生长模型的理论基础与实证分析

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Object: Common acne is a chronic inflammatory disease of the hair follicle and the sebaceous glands, mostly seen in teenagers with comedones, papulae, pustules, nodules and cysts formed on the face, chest and back.

目的：寻常痤疮是一种毛囊及皮脂腺的慢性炎症，多见于青春期男女，在面部、胸部和背部形成粉刺、丘疹、脓疱、结节及囊肿。

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the comedo subtype ( 7/ 9) and the high grade nuclei of dcis ( 6/ 9), correlating with poor prognosis, were more likely to be accompanied by linear and branching calcification.

线样分支状钙化易出现在粉刺型（7/9）高核级（6/9）DCIS中；

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acne is a chronic inflammatory disease of pilosebaceous follicles, characterized by comedones, papules, pustules, nodules, cysts, and often scars.

痤疮是一种毛囊皮脂腺的慢性炎症性皮肤病，主要发生于面、胸背等处，形成粉刺、丘疹、脓疱、结节、囊肿、瘢痕等皮损。

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from 42 cases of acne vulgaris, 128 samples were collected among which 72 were from comedones, while 56 from pustules.

我们对42名寻常性痤疮病人、共采集标本128份，其中粉刺72份，脓液56份，进行需氧和厌氧培养。

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the evaluation of eic and comedo necrosis is useful in clinical work.

EIC与粉刺状坏死的检测有临床应用价值。

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determination of the contents of three ingredients in comedo gel

面刺凝胶中3种成分的含量测定

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a case of zonary comedo nevus encircling neck

围颈部带状黑头粉刺痣1例

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it was only after the army, through the action of innumerable infinitesimally small forces, had been brought to tarutino, that people began to protest to themselves that that was the course they had desired, and had long foreseen as the right one.

只有当军队由于无数的千差万别的力量相互作用的结果抵达塔鲁丁诺之后，人们才自信地说，他们本来就是这样想的，早就预见到这一点了。

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when dealing with large masses or time periods that are infinitesimally small, like the core of a black hole or the first moments after the big bang, neither quite works.

但是在研究大质量物质或无限小的时间段时，比如，对黑洞的核或者是宇宙大爆炸后的最初时刻，二者都不能完美地加以解释。

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it is no more difficult to attract, on a scientific level, something that we consider huge, to something that we consider infinitesimally small.

从更科学的角度（层面？）来说，吸引一个我们认为“很大”的事物，并不比吸引一个我们认为非常小的东西更难。

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the work has been accomplished without adding an infinitesimally small "extra" magnetic moment [ 1] and an interaction item [ 2].

本文在未引入额外磁矩项和相互作用项的条件下，完成了这一工作。

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