助手标题  
全文文献 工具书 数字 学术定义 翻译助手 学术趋势 更多
查询帮助
意见反馈
   accidental exposure 在 生物学 分类中 的翻译结果: 查询用时:0.069秒
图标索引 在分类学科中查询
所有学科
生物学
环境科学与资源利用
基础医学
更多类别查询

图标索引 历史查询
 

accidental exposure
相关语句
查询“accidental exposure”译词为用户自定义的双语例句

    我想查看译文中含有:的双语例句
例句
为了更好的帮助您理解掌握查询词或其译词在地道英语中的实际用法,我们为您准备了出自英文原文的大量英语例句,供您参考。
  accidental exposure
Thus, the accidental exposure of humans to l-methyl-4-phenyl-l,2,3,6-tetrahydropyridine and to 3-nitropropionic acid has led to primate models of Parkinson's disease and Huntington's disease, respectively.
      
These results suggest that PdZn alloy, even after an accidental exposure to oxygen, can self repair to form the active PdZn alloy phase under methanol steam reforming conditions.
      
Accidental exposure dose assessment by electron spin resonance (ESR) technique from the free radicals generated in a cotton handkerchief has been attempted in this investigation.
      
A liquid scintillation counting method for the simultaneous determination of Pu and Am, with a two-phase cocktail, has been applied to the analysis of a tissue sample from an accidental exposure incident.
      
Accidental exposure of children to polychlorinated biphenyls
      
更多          


In order to use the observed yield of chromosome aberrations in peripheral bloodlymphocytes as a measure of in vivo radiation dose,it is essential to establish dose-response curves by irradiating blood samples in vitro.Following in vitro calibrationof X-ray irradiation,we studied the dose-response curves of chromosome aberrations inhuman lymphocytes induced with ~(60)Co γ-rays and compared the effect of both radiationtypes.The conclusions are as follows.(1)In human lymphocytes,only in vitro dose-response curves...

In order to use the observed yield of chromosome aberrations in peripheral bloodlymphocytes as a measure of in vivo radiation dose,it is essential to establish dose-response curves by irradiating blood samples in vitro.Following in vitro calibrationof X-ray irradiation,we studied the dose-response curves of chromosome aberrations inhuman lymphocytes induced with ~(60)Co γ-rays and compared the effect of both radiationtypes.The conclusions are as follows.(1)In human lymphocytes,only in vitro dose-response curves established understandardized conditions might permit a meaningful biological dosimetry based onchromosome damage,i.e.these data should be obtained under circumstances as close aspossible to those existing during accidental exposure.Our studies showed that forcytogenotic dosimetry it is necessary to irradiate whole blood at 37℃ before PHA-stimulation and for the culture time to be less than 54 hours.Even when the abovecriteria were adhered to,the curves from different laboratories showed obvious variation.Therefore,we suggest that each laboratory should establish its own calibration curvesbefore standardization of cytogenetic techniques is possible.(2)According to WHO criteria,for the analysis of the dose-effect relationship theobserved values are fitted by least-square regression analysis using Poisson varianceand weights to corresponding models.Like those induced by X-rays,the dicentric andcentric ring data induced by ~(60)Co γ-ray gave the best fit to the second degree polynomialmodel with a=0(the regression was constrained to pass through the origin),Y_(γ-ray)=(0.59+0.94)×10~(-4)D+(4.77±0.40)×10~(-6)D~2,while Y_(x-ray)=(0.51±0.21)×10~(-3)D+(5.02±0.77)×10~(-6)D~2.A physical interpretation of this equation could be theproduction of some exchange aberrations by a single track and of others by the interactionof two separate tracks.Comparing the relative b and c coefficients for the two types ofradiation,the main difference lies in the b terms in the production of asymmetricalexchange aberrations.Based on the quadratic function,the linear component in theaberration yield derived from single track lesion is independent of dose-rate,and the value of b/c(i.e.λ)is the dose at which the constributions from single-track andtwo-track events are equal.This value for γ-ray and X-ray is 12 rads and 100 radsrespectively.Hence,it may be assumed that for biological dosimetry in cases ofaccidental over exposure to ~(60)Co γ-rays more account should be taken of the dose-ratethan in cases of over exposure to X-rays.Similarly,the data for dicentrics and centricrings may also be fitted to the potential function with Y_(γ-ray)=1.64×10~(-5)D~(1.79±0.11)andY_(x-ray)=6.50×10~(-5)D~(1.61±0.05).However,it should be noted that the data fit better thequadratic as compared with the power function especially when extrapolated to lowdoses.(3)Because the aberration yields induced by various types of radiation weredifferent from one another,their dose-response curves must be established separately,from the view point of radiation protection.The work reported here showed that ~(60)Coγ-rays are less efficient than X-rays.No single RBE value for ~(60)Co γ-rays versus 180kVX-rays for exchange aberrations could be calculated.The RBE values varied between0.12 and 0.89.From RBE-dose relations,it may be seen that the RBE value rises withincreasing ~(60)Co γ-ray doses within the dose range analysed(24~488 rads),and thentends gradually toward saturation.

为了把外周血淋巴细胞中所观察到的染色体畸变量用来估算活体照射的剂量,需要确定离体照射血样本的剂量-效应曲线。继X-线离体照射的刻度实验后,我们又研究了~(60)钴γ-线诱发染色体畸变的剂量-效应曲线,并且比较了这两种辐射的效应,所得的结论如下:1.根据人淋巴细胞的染色体畸变进行生物剂量测定,只有在标准条件下确定的离体剂量-效应曲线才能得出有意义的结果,也就是说,应尽可能地与事故照射时所出现的条件相同。我们的研究表明,细胞遗传学的剂量测定应在37℃照射未受PHA~**刺激的全血,培养的时间应少于54小时。当比较各实验室符合上述条件的剂量-效应曲线时,显然有差异。因此,我们提议在细胞遗传学技术“标准化”之前,各实验室应建立自己的刻度曲线。2.按照世界卫生组织的标准,在分析剂量-效应关系时,以最小二乘方对实验资料作泊森方差和加权回归分析,拟以恰当的模式。如X-线一样,~(60)钴γ-线诱发的双着丝粒体和着丝粒环资料最适于二次多项式,a=0(回归线通过原点),分别为Y_(γ-线)=(0.59±0.94)×10~(-4)D+(4.77±0.40)×10~(-6)D~2和Y_(x-线)=(0.51±0.21)×10~(-...

为了把外周血淋巴细胞中所观察到的染色体畸变量用来估算活体照射的剂量,需要确定离体照射血样本的剂量-效应曲线。继X-线离体照射的刻度实验后,我们又研究了~(60)钴γ-线诱发染色体畸变的剂量-效应曲线,并且比较了这两种辐射的效应,所得的结论如下:1.根据人淋巴细胞的染色体畸变进行生物剂量测定,只有在标准条件下确定的离体剂量-效应曲线才能得出有意义的结果,也就是说,应尽可能地与事故照射时所出现的条件相同。我们的研究表明,细胞遗传学的剂量测定应在37℃照射未受PHA~**刺激的全血,培养的时间应少于54小时。当比较各实验室符合上述条件的剂量-效应曲线时,显然有差异。因此,我们提议在细胞遗传学技术“标准化”之前,各实验室应建立自己的刻度曲线。2.按照世界卫生组织的标准,在分析剂量-效应关系时,以最小二乘方对实验资料作泊森方差和加权回归分析,拟以恰当的模式。如X-线一样,~(60)钴γ-线诱发的双着丝粒体和着丝粒环资料最适于二次多项式,a=0(回归线通过原点),分别为Y_(γ-线)=(0.59±0.94)×10~(-4)D+(4.77±0.40)×10~(-6)D~2和Y_(x-线)=(0.51±0.21)×10~(-3)D+(5.02±0.77)×10~(-6)D~2。这一方程的物理含义是,一些互换畸变由一次击中所产生,而另一些则是由二个分开的击中相互作用所致。当把两种辐射的系数b 和c 作比较时,主要差别在于导致不对称互换畸变的b 项。根据该指数方程.,畸变量的直线成分(即由一击损伤所致)与剂量率无关,而λ值(b/c)即为一击和二击事件的提供量相等时的剂量,此值分别为λ_(γ-线)=12拉德,而λ_(X-线)=100拉德。由此可以设想,在从事~(60)钴γ-线超暴光例子的生物剂量测定时,与X-线相比较,更应考虑到剂量率的问题。双着丝粒体和着丝粒环资料,同样也可拟以幂函数,此时,Y_(γ-线)=1.64×10~(-5)D~(1.79±0.11),而Y_(X-线)=6.50×10~(-5)D~(1.61±0.05)。然而应当指出,资料拟以二次多项式比幂函数更好些,当从畸变量外推至低剂量时尤其是这样。3.鉴于各种辐射诱发的畸变量彼此不一,所以从辐射防护出发,必须分别地确定剂量-效应曲线。这里的工作表明,~(60)钴γ-线诱发畸变的效能比X-线要低。~(60)钴γ-线相对于180kVX-线诱发互换畸变的RBE 不是一个单一值,其RBE 值变动在0.12和0.89之间。从RBE-剂量关系可以看出,在所用的剂量范围(24~488拉德)内,RBE 值随~(60)钴γ-线剂量的增加而上升,随后即趋向于饱和。

 
图标索引 相关查询

 


 
CNKI小工具
在英文学术搜索中查有关accidental exposure的内容
在知识搜索中查有关accidental exposure的内容
在数字搜索中查有关accidental exposure的内容
在概念知识元中查有关accidental exposure的内容
在学术趋势中查有关accidental exposure的内容
 
 

CNKI主页设CNKI翻译助手为主页 | 收藏CNKI翻译助手 | 广告服务 | 英文学术搜索
版权图标  2008 CNKI-中国知网
京ICP证040431号 互联网出版许可证 新出网证(京)字008号
北京市公安局海淀分局 备案号:110 1081725
版权图标 2008中国知网(cnki) 中国学术期刊(光盘版)电子杂志社