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mitochondrial dnais the only inheritant substance except for the nuclear dna in a euˉkaryon cell,which is related to the oxidative phosphorylation of a cell.mitochondrial dna is the important target of carcinogens and is vulnerable because of its structure and function.the mutation of mtdna could reduce the nomal respitation and release large quantities of ros,whichincrease the danger of cancer happening.so,mtdna has been thought to be involved in carcinogenesis and recently more and more studies in this aspect have comeout.in this paˉper,we review the researches for relationship among mtdna mutation and tumors in digestion system,woman system,head and neck,urinary systemand blood system.

线粒体dna（mitochondrial dna，mt dna）是真核细胞中唯一存在的独立于核dna之外的遗传物质，与细胞的氧化磷酸化功能密切相关。mtdna自身的结构和功能特点决定了它是致癌物作用的重要靶点，易受致癌因素的损伤而发生突变。mtdna的突变可削弱正常的呼吸功能，释放高水平的活性氧，进而增加肿瘤发生的危险性，所以mtdna被认为与肿瘤发生有密切关系。近年来，这方面的研究越来越多，本文现就mtdna突变与消化系统肿瘤、妇科肿瘤、头颈部肿瘤、泌尿系统肿瘤等实体瘤以及血液系统恶性肿瘤之间的关系作一简单的综述。

The production value is more than 100 million RMB per year. The technology of suspend double lockpin cylinder, which was new developed for high-security mortise lock series, keeps head of advanced level in the world at present and have win patent.

新研制开发的&悬浮式双锁销锁头&系列高安全插芯锁具产品已获国家专利，该系列产品的安全技术标准领先于国际先进水平，达到防&万能匙&之目的。

Anthers short, appendages appressed to stigma head; pollinia 2 per pollinarium, obliquely oblong-falcate, erect to horizontal.

花药短，附属物贴伏于柱头头状花序；花粉块2 每pollinarium，镰刀形斜长圆形，对水平直立。

Filaments connate into a short tube; anthers erect, apex membranous and inflexed on base of stigma head; pollinia 2 per pollinarium, erect, ovoid, apex with a small translucent beak.

花丝合生成一短管；花药直立，先端膜质和在柱头头状花序的基部上内折；花粉块2 每pollinarium，直立，卵圆形，先端具一个小的半透明的喙。

Stamens short connate, apical membrane of anthers appressed against stigma head; pollinia 2 per pollinarium, oblong, erect, with raised, translucent margin.

合生的雄蕊短，顶端膜的花药反对柱头头状花序；花粉块2 每pollinarium，长方形，直立，带有被举起，半透明的边。

Anthers erect, with apical membrane overlying stigma head; pollinia 2 per pollinarium, margin translucent, caudicles enlarged at apex, erect.

花药直立，具顶端的膜overlying柱头头状花序；花粉块2 每pollinarium，半透明的空白边，花粉块柄放大在先端，直立。

Filaments connate into a tube; anthers somewhat concave at middle, appendages rounded, covering stigma head; pollinia 2 per pollinarium, oblong, pendulous.

花丝合生成筒；花药有点凹的在中部，附属物圆形，包括的柱头头状花序；花粉块2 每pollinarium，长方形，下垂。

Filaments connate into a tube; anthers erect, membranous apical appendages as long as or slightly longer than stigma head; pollinia 2 per pollinarium, ovoid-oblong or oblong, erect.

花丝合生成筒；花药直立，膜质顶端附属物等长或稍长于柱头头状花序；花粉块2 每pollinarium，或长圆形，直立的卵圆形长方形。

Anther appendages membranous, ovate, overlying stigma head; pollinia 2 per pollinarium, oblong, horizontal, caudicles obliquely ascending.

花药附属物膜质，卵形，柱头头状花序；花粉块2 每pollinarium，长方形，水平，斜升的花粉块柄。

Anthers confluent to corolla, uniformly pale and glossy with long margin and dorsal groove, apex retuse, appendages sharply delimited, ovate, scarious except for narrow midrib, covering stigma head; pollinia 2 per pollinarium, oblong, pendulous.

对花冠汇合的花药，均匀浅和和背侧具凹槽的有光泽具长边缘，先端微凹，锐的附属物限定，除了狭窄的中脉卵形，干膜质，花粉块2 每pollinarium，长方形，下垂。

Plunder melds and run with this jewel!

掠夺melds和运行与此宝石！

My dream is to be a crazy growing tree and extend at the edge between the city and the forest.

此刻，也许正是在通往天国的路上，我体验着这白色的晕旋。