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首页> 外文期刊>Journal of bacteriology >Formation and Ultrastructure of Extra Membranes in Escherichia coli
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Formation and Ultrastructure of Extra Membranes in Escherichia coli

机译:大肠杆菌中多余膜的形成和超微结构

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A temperature-sensitive strain of Escherichia coli (strain 0111a1) was shown to accumulate membranous structures at 40 C. These “extra membranes” appeared as vesicles or whorls (or both), depending on the time of growth at 40 C. After 2 hr of growth at 40 C, only vesicles were observed in E. coli 0111a1 cells; both vesicles and whorls were apparent after 6 hr. The number of cells which contained both types of extra membrane reached a maximum value (75%) after 10 hr of growth at 40 C. Extra membrane production was also studied by using temperature shifts. In shift-up experiments, cells grown at 30 C into early stationary phase accumulated extra membrane after a shift to 40 C. The percentage of E. coli 0111a1 cells containing extra membrane decreased significantly after a shift from 40 to 30 C. Phase- and electron-microscopic observations indicated that E. coli 0111a1 cells grown at 40 C were larger than E. coli 0111: B4 cells grown at either temperature. The ratio of optical density per cell and cell measurements obtained from quantitative electron microscopy confirmed that E. coli 0111a1 cells grown at 40 C were about twice as large. Microdensitometer traces indicated that the dimension of a single membrane of either whorls or vesicles was 5.4 nm in peak-to-peak distance (8.8 nm total thickness).
机译:表现出温度敏感性的大肠杆菌(em> Escherichia coli)(菌株0111a 1 )在40°C时会积累膜结构。这些“额外的膜”表现为囊泡或螺旋状(或两者都有) ),具体取决于在40°C下的生长时间。在40°C下生长2小时后,在 E中仅观察到囊泡。大肠杆菌 0111a 1 细胞; 6小时后囊泡和螺纹均明显。在40°C下生长10小时后,包含两种类型的额外膜的细胞数量达到最大值(75%)。还通过使用温度变化研究了额外的膜生产。在上移实验中,在30 C成长为早期固定相的细胞在移至40 C后会积聚额外的膜。 E的百分比。从40°C转变为30°C后,含有额外膜的大肠杆菌0111a 1 细胞显着减少。相和电子显微镜观察表明, E。在40 C下生长的大肠埃希氏菌0111a 1 细胞比 E大。 coli 0111:B 4 细胞在任一温度下均生长。从定量电子显微镜获得的每个细胞的光密度与细胞测量值之比证实了 E。在40°C下生长的大肠杆菌0111a 1 细胞大约是原来的两倍。微量密度计痕迹表明,在峰到峰之间的距离中,涡旋或囊泡的单个膜的尺寸为5.4 nm(总厚度为8.8 nm)。

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