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solar halo
相关语句
  日晕
    The plaque of HPA2 has transparent center with obscure edge . which is bigger than others and similar as solar halo.
    HPA2的噬菌斑较大,中间透明边缘模糊,似日晕状;
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    The plaque of HPA2 has transparent center with obscure edge ,which is bigger than others and similar as solar halo.
    HPA2的噬菌斑较大,中间透明边缘模糊,似日晕状;
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  solar halo
On May 5th 1950 a conspicuous solar halo attracted the interest of many of the inhabitants of the Isle of Cuba.
      


Three strains of streptomyces-phages (HPA1, HPA2, HPA3) were isolated from soil samples collected from Baoding, China. Their morphology and stability were studied. The morphologies of their plaques are different in nutrient agar medium. The plaque's size of HPA1 is medium and transparent. The plaque of HPA2 has transparent center with obscure edge ,which is bigger than others and similar as solar halo. The last type of PHA3 is small and like pin prick. The result of electronic microscope showed that...

Three strains of streptomyces-phages (HPA1, HPA2, HPA3) were isolated from soil samples collected from Baoding, China. Their morphology and stability were studied. The morphologies of their plaques are different in nutrient agar medium. The plaque's size of HPA1 is medium and transparent. The plaque of HPA2 has transparent center with obscure edge ,which is bigger than others and similar as solar halo. The last type of PHA3 is small and like pin prick. The result of electronic microscope showed that external forms of their heads are all circular shape, but the sizes and length of their tails varied. HPA1 has long tail, and HPA3 has short tail, while HPA2 has no tail . Their host range is narrow. They are unable to infect Streptosporangium strains and other actinomycetes, expect some streptomyces species. Among the three streptomyces-phages (HPA1, HPA2, HPA3) , HPA2 is more tolerate to temperature than others. When temperature reached 60℃, 21% of HPA2 were still survived. HPA1 and HPA3 are sensitive to chlorotorm,while HPA2 is resistant to chlorotorm. In addition, they are all sensitive to ultraviolet ray. When they were exposed to ultraviolet ray for 5 minutes, their rates of Plaque-forming were outstandingly decreased. They all have obvious resistance to potassium dichromate and actidione.

从土壤中分离到三株链霉菌噬菌体HPA1、HPA2、HPA3,对它们的形态学和稳定性进行了研究。在营养琼脂培养基平板上,它们所形成的噬菌斑形状各不相同,噬菌体HPA1所形成的噬菌斑大小中等且透明;HPA2的噬菌斑较大,中间透明边缘模糊,似日晕状;而HPA3的噬菌斑较小,针眼状。电镜观察指出,三株噬菌体的头部外形都呈球形,但其大小和尾部长度有所不同。HPA1长尾,HPA3短尾,而HPA2无尾。它们的宿主范围较窄,除链霉菌的某些属外,它们不能侵染链孢囊及其他属的放线菌。其中HPA2对氯仿和温度的耐受力都较强,且在60℃时,仍有21%能够存活。

 
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