threshold exposure 中文意思是什麼

threshold exposure 解釋
臨界曝光
  • threshold : n. 1. 門檻；入口，門口。2. 【心理學】閾限。3. 界限，限度。4. 【物理學】臨界值，閾。5. 入門，開始，開端。
  • exposure : n. 1. 曝露；曝曬；揭發。2. 【攝影】曝光；膠卷[軟片]張數；曝光時間。3. （房屋的）朝向，方位。4. 商品的陳列。5. 【歷史】（嬰兒的）曝棄。
  1. 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。
  2. The severity of stochastic effects is independent of the absorbed dose. under certain exposure conditions, the effects may or may not occur. there is no threshold and the probability of having the effects is proportional to the dose absorbed

    隨機性效應隨機性效應的嚴重程度是不受吸收劑量的大小影響。在一定的照射條件下，效應可能出現，也可能不出現，而發生的機率則與劑量大小有關，並且不存在劑量閾值。
  3. Each wavelength of optical radiation has an associated threshold retinal exposure level that must be exceeded in order for retinal damage to be observed - shorter wavelengths are more effective in that less energy is needed

    對應每種波長的光都有一個極限值，超過這個極限值才能使視網膜受到損害.對于較短波長的光幅射，這個極限值的能量強度較低
  4. The amount of nickel released from the euro coins was up to 30 times above a level regarded by scientists as the concentration threshold for reactivity to a single exposure

    實驗結果表明，當人們手拿這種硬幣時接觸到的鎳竟然比科學家實驗得出的能夠引起過敏反應的最低鎳濃度高出30倍。
  5. Under certain exposure conditions, the effects may or may not occur. there is no threshold and the probability of having the effects is proportional to the dose absorbed

    在一定的照射條件下，效應可能出現，也可能不出現，而發生的機率則與劑量大小有關，並且不存在劑量閾值。
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