The polytene chromosomes found in the salivary gland cells are among the largest chromosomes known today . 唾液腺细胞中的多线染色体是目前已知的最大染色体之一。
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Super high molecular weight polytene lining plate used in coal bin 超高分子量聚乙烯衬板在煤仓中的应用
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The research was ultimately possible thanks to the unique composition of the fruit flies ' polytene cells - - giant , multistranded chromosomes with hundreds of sets of the genome instead of the usual two sets in conventional cells 这项研究可能最终还要感谢果蝇与众不同的染色体组成? ?巨大、多链状染色体，和一般细胞两套染色体不同，果蝇染色体有数百套之多。
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It is applied to blowing plastic films like lpw density polytene ( ldpe ) 、 high density polytene ( hdpe ) and linear low density polytene ( lldpe ) 、 etc lt is widely applied to packing foodstuff 、 clothing 、 ruddish bags 、 vest ones 、 in the civil and industries sectots 用途：适用于吹制低密度聚乙烯（ ldpe )高密度聚乙烯（ hdpe )线性低密度聚乙烯（ lldpe )等塑料薄膜，广泛应用于食品、服装、垃圾袋、背心袋等民用及工业包装。
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2 , the hsp gene transcription was quantitatively determined by rt - pcr . based on this result , it is concluded that the change of acetylation level at the loci of hsp , mediated by histone deacetylase inhibitors , exerts important functions in hsp gene transcription . 3 , after immunolabeling with anti acelated - lysine monoclonal antibody on the polytene chromosomes of heat shocked flies , fluorescence signals were detected at the hsp loci 2 ，利用rt - pcr技术，对去乙酰化酶抑制剂处理后的果蝇的热休克基因的表达水平进行检测，结果表明经组蛋白去乙酰化酶抑制剂处理后的果蝇幼虫，其热休克基因的表达高于基础水平，也就是说去乙酰化酶抑制剂诱导了热休克基因的表达。
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1 , the histone deacetylase inhibitors were used to feed the larve of the fly , and then the polytene chromosomes were observed under the microscope . the results indicated that the histone deacetylase inhibitors had effects on the morphology of the polytene chromosomes . it is suggested that the acetytion has effects not only on the molecular interaction but also on the structure of the chromosomes 得到的主要结果和结论如下： 1 ，通过用去乙酰化酶抑制剂处理果蝇幼虫，观察果蝇多线染色体在热休克基因处的形态变化，发现去乙酰化酶抑制剂介导的乙酰化水平的升高可引起染色体结构的显著变化，推测乙酰化修饰不仅影响分子间的相互作用而且还可以影响染色体的高级结构。
