low dose of exposure 中文意思是什麼
low dose of exposure
解釋
小劑量照射-
Adaptive response of murine thymocytes induced by low dose - rays before mmc exposure
損傷小鼠胸腺細胞的適應性反應 -
In the field of the phytoremediation of copper pollution, submerged macrophytes are focused less than the terrestrial plants. in this study, ceratophyllum demersum l. and cahomba caroliniana a. gray were used as the test plant. the following two aspects were investigated in vivo methods : 1 ) the toxicity effects of cu2 + on the three main antioxidant enzymes ( including cat, pod and sod ) of two submerged macrophytes were detected at different low doses and on the chronic exposure, in order to establish the dose - effect relationship and the time - effect relationship, and thereby acquire the toxicity threshold ; and 2 ) with two submerge macrophytes throng cultured individual or combined on the chronic exposure, it was found on the bcf of copper and the influence of interspecific relationships to the submerge macrophytes resistance or bioconcentration
本論文以兩種大型沉水植物金魚藻（ c . demersuml . ）和水盾草（ c . carolinianaa . ）為受試植物，從它們對水體中cu ~ （ 2 + ）的生物富集作用和動態，以及cu ~ （ 2 + ）對它們體內抗氧化酶的急性毒性效應和亞急性毒性效應兩方面進行了研究： 1 ）通過體內暴露不同劑量的cu ~ （ 2 + ） ，探討cu ~ （ 2 + ）對植物體內三種主要的抗氧化物酶（ sod ， pod ， cat ）的毒理效應，建立劑量?效應關系和時間?效應關系，以揭示沉水植物對cu ~ （ 2 + ）的抗性機制； 2 ）通過對金魚藻，水盾草單獨培養和共同培養的方式，分別研究了兩種沉水植物對cu ~ （ 2 + ）的生物富集系數及其動態以及兩種植物的種間關系對富集銅和植物耐性的影響，綜合評價了兩種植物在銅污染水體的植物修復中的應用前景。 -
For the acute exposure duration, there expressed the dose - thresholds and time - thresholds in the effects of cu2 + on the activities of cat, pod and sod in two macrophytes. when the test species were exposed at low dose and for a short period, cu2 + can stimulate activities of antioxidant enzymes. once exceeding the thresholds, cu2 + may inhibit enzymes activities
Cu ~ （ 2 + ）低濃度和短時間內對抗氧化酶有誘導作用，超過一定的閾限會產生抑制作用；金魚藻cat 、 pod 、 sod活性在7天內的最大抑制率與暴露cu ~ （ 2 + ）濃度呈顯著正相關。 -
It should be note that experimental data for dose - effect relationship are still scanty, especially for low doses and low dose rates. the risk factors are deduced from a single exposure of more than 1 gy and are subject to certain uncertainties. the figures are therefore neither precise nor final
因此危險度分析是推測性的，所根據的數據和資料主要來源於一戈以上單次照射的結果，而且有一定的不確定性，所以在應用時要留意其局限性，不能視其為精確的或不變的數據。 -
Based on the model of linear quadratic relationship of dose - response, dosimetric method for assessment of deterministic hazard of low let radiation accident exposure in accordance with different time distribution of dose were developed in the paper by means of given thresholds of deterministic effects
輻射事故照射，除大劑量急性照射情況外，更多的還有受照延續時間不等、照射水平不一的多次受照情況，甚至尚有數天內連續受照的。
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