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水平接触
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  level exposure
     Results In the low level exposure group,PbB was a more sensitive indicator and changed earlier,and δ ALA,δ ALAD and FEP changed later.
     结果 低水平接触组以PbB变化较早和灵敏 ,其次为δ ALAD ,δ ALA和FEP的增高出现较晚 ;
短句来源
     In the high level group,all indicators changed significantly,with an increase in δ ALA to a greater extent than that in FEP,PbB and PbU,but δ ALAD increased as that in the medium level exposure.
     高水平接触组各项指标均出现明显的改变 ,以δ ALA变化幅度较大 ,其次为FEP、PbU、PbB ,而δ ALAD的变化与中等水平组相似 ,Hb仅在 2 4周出现降低。
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  “水平接触”译为未确定词的双语例句
     On the other hand, compared with the controls(~7.75±10.16 ), a significant decrease of the ratio of T/LH in both the high(3.72±2.06) and the low (3.41±2.55) DMF exposure groups were decreased.
     高、低水平接触组T/LH比值(3.72±2.06、3.41±2.55)明显低于对照组(7.75±10.16)。
短句来源
     Cadmium (Cd) has been considered as a harmful pollutant of world wide concern. Cadmium exposure with long term and low level has become the focus of toxicological research.
     镉(cadmium,Cd)引起的健康危害已受到全球的高度关注,特别是长期低水平接触镉引起的毒性已成为当今研究的重点。
短句来源
     In the case of vertical contact plane in homogeneous half space, xy mode is betterthan yx mode while in the case of horizontal contact plane the thing is quite theopposite.
     对地下半空间中的垂直接触模型来说,xy模式比yx模式效果好,而对水平接触模型则相反;
短句来源
     The results suggested that the spectrum of erythrocyte membrane proteins,especially spectrin might become a dose-effect molecular biomarker in workers exposed to carbon disulfide.
     结论 长期接触CS2 作业工人红细胞膜蛋白电泳图谱出现异常 ,提示该指标有希望成为CS2 接触工人的分子水平接触 -效应生物标志物。
短句来源
     No significant difference in urine level of 5 HIAA was found between children with exposed parents and controls.
     尿中 5 HIAA水平 ,接触组与对照组儿童间差异未见有显著性。
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  相似匹配句对
     C were measured by the method of radioimmunology.
     C的水平
短句来源
     Analysis of Contact Melting around an Elliptical Cylinder Heat Source
     围绕水平椭圆柱热源接触熔化的分析
短句来源
     The Contact Problem of the Free-rolling Tire on Level Road
     轮胎在水平路面上的自由滚动接触分析
短句来源
     the level of carbohydrates;
     碳水化合物水平;
短句来源
     Touching Strangers
     接触陌生人
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  level exposure
In this study the effects of low-level exposure to lead on blood pressure were examined among 244 adults using atomic absorption spectrometer.
      
The median exposure to CS2(8 h time weighted) in the low-level exposure group was 4.
      
Zebrafish were maintained for 6 mo in ultrapure water containing >amp;lt;0.2 μmol B/L to determine the effect of low-level exposure.
      
High-level exposure was assessed by exposing zygotes, derived from parents maintained at 46 μmol B/L, to graded concentrations of boric acid up to a concentration of 75 mmol B/L from fertilization until they were free feeding (96 h).
      
Some mechanisms are described by which selenium, vitamin E, and other factors might facilitate MeHg breakdown to inorganic Hg during long term low level exposure to MeHg.
      
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Objective To observe the influence of carbon disulfide(CS 2) exposure on worker's spectrum of erythrocyte membrane proteins. Methods CS 2 concentration in air of workplace was detected.The erythrocyte membrane of 16 workers(8 in exposed group,others in control group) were separated by sodium dodecyl sulfate-polyacrylamide gel electrophoresis(SDS-PAGE). Results The range of CS 2 concentration(TWA) in air of workplace was 0~8.98 mg/m 3.The relative percentage of erythrocyte membrane spectrin in exposed...

Objective To observe the influence of carbon disulfide(CS 2) exposure on worker's spectrum of erythrocyte membrane proteins. Methods CS 2 concentration in air of workplace was detected.The erythrocyte membrane of 16 workers(8 in exposed group,others in control group) were separated by sodium dodecyl sulfate-polyacrylamide gel electrophoresis(SDS-PAGE). Results The range of CS 2 concentration(TWA) in air of workplace was 0~8.98 mg/m 3.The relative percentage of erythrocyte membrane spectrin in exposed workers (34.48%) was higher than that in control workers(26.18%)( t =5.920, P <0.001).The percentage of spectrin was correlated with CS 2 concentration(TWA)( r =0.859, R 2 =0.738, P <0.001),as well as exposure index(EI, r =0.713, R 2 =0.508, P =0.002).A doubted new band in high molecular zone of erythrocyte membrane protein was found in two workers who had a long-term exposure history. Conclusion Long-term exposure to high levels of carbon disulfide may cause the spectrum abnormality of erythrocyte membrane proteins in workers.The results suggested that the spectrum of erythrocyte membrane proteins,especially spectrin might become a dose-effect molecular biomarker in workers exposed to carbon disulfide.

目的 观察作业工人长期接触二硫化碳 (CS2 )对其红细胞膜收缩蛋白的影响。方法 气相色谱法测定作业场所CS2 浓度 ;分离 16名工人红细胞膜 (接触、对照各 8人 ) ,采用十二烷基硫酸钠 -聚丙烯酰胺凝胶电泳 (SDS PAGE)法分析红细胞膜蛋白谱。结果 车间空气CS2 浓度 (TWA)为 0~ 8.98mg/m3。CS2 接触工人红细胞膜收缩蛋白百分含量 (34.48% )高于对照工人 (2 6 .18% ) (t =5 .92 0 ,P <0 .0 0 1) ,CS2 浓度 (TWA)与收缩蛋白含量呈正相关 (r=0 .85 9,R2 =0 .738,P <0 .0 0 1) ,接触指数 (EI)与收缩蛋白含量也呈正相关 (r=0 .713,R2 =0 .5 0 8,P =0 .0 0 2 )。其中 2名长工龄高浓度CS2接触工人红细胞膜图谱在高相对分子质量区有可疑异常区带形成。结论 长期接触CS2 作业工人红细胞膜蛋白电泳图谱出现异常 ,提示该指标有希望成为CS2 接触工人的分子水平接触 -效应生物标志物。

Objective To explore the dynamic changes in some markers in biological monitoring and porphyrin metabolism.Methods Blood lead(PbB),urine lead(PbU),urine δ aminolevulinic acid(δ ALA),activity of δ aminolevulinic acid dehydrase(δ ALAD),free erythrocyte protoprophyrin(FEP)and hemoglobin(Hb)were measured for 110 workers in the smelters re exposed to lead after chelating treatment,as well as the air level of lead fume in the workplaces was monitored.Results...

Objective To explore the dynamic changes in some markers in biological monitoring and porphyrin metabolism.Methods Blood lead(PbB),urine lead(PbU),urine δ aminolevulinic acid(δ ALA),activity of δ aminolevulinic acid dehydrase(δ ALAD),free erythrocyte protoprophyrin(FEP)and hemoglobin(Hb)were measured for 110 workers in the smelters re exposed to lead after chelating treatment,as well as the air level of lead fume in the workplaces was monitored.Results In the low level exposure group,PbB was a more sensitive indicator and changed earlier,and δ ALA,δ ALAD and FEP changed later.In the medium level exposure group,PbB,PbU and δ ALAD were more sensitive and the earliest indicator to increase,but δ ALA and FEP increased later and kept in a higher level.In the high level group,all indicators changed significantly,with an increase in δ ALA to a greater extent than that in FEP,PbB and PbU,but δ ALAD increased as that in the medium level exposure.Correlation and cluster analysis showed that PbB,PbU and δ ALAD appeared similarly regular changes,but FEP and δ ALA appeared similar time series changes.Conclusions Toxic effects could be revealed in a shorter time period in the workers re exposed to lead after chelating agent treatment.All indicators appeared two different types of change trends after re exposure to lead.It is emphasized that primary prevention should be strengthened.

目的 探讨排铅工人再接铅后 ,某些生物监测指标和卟啉代谢指标的动态变化。方法  110名冶炼厂工人经排铅治疗后 ,回生产岗位 2周、 7周、 2 4周 ,分别采样进行血铅 (PbB)、尿铅 (PbU)、尿氨基酮戊酸 (δ ALA)、血氨基酮戊酸脱水酶 (δ ALAD)、红细胞游离原卟啉 (FEP)、血红蛋白 (Hb)的监测 ,同时进行作业场所空气铅烟的监测。结果 低水平接触组以PbB变化较早和灵敏 ,其次为δ ALAD ,δ ALA和FEP的增高出现较晚 ;中等水平接触组以PbB ,PbU和δ ALAD变化出现最早和敏感 ,其后变化趋势变缓 ,但δ ALA、FEP持续增高 ;高水平接触组各项指标均出现明显的改变 ,以δ ALA变化幅度较大 ,其次为FEP、PbU、PbB ,而δ ALAD的变化与中等水平组相似 ,Hb仅在 2 4周出现降低。经相关和聚类分析 ,PbB、PbU、δ ALAD活性具有相似变化规律 ,而FEP与δ ALA具有相似的时间序列变化规律。结论 工人排铅后再接铅 ,在较短时间内出现铅的毒性效应 ,应加强一级预防 ,接铅后各项指标呈现两种不同类型的变化态势

Using the basic solutions of a single crack and a single inclusion, and making use of the principle of linear superposition of elastic mechanics, the interaction problem between a planar crack and a flat inclusion in an elastic solid is studied. The problem is reduced to solve a set of standard Cauchy_type singular equations. And the stress intensity factors at points of crack and inclusion were obtained. Besides, the singularity for the horizontal contact of crack and inclusion was analyzed. The calculating...

Using the basic solutions of a single crack and a single inclusion, and making use of the principle of linear superposition of elastic mechanics, the interaction problem between a planar crack and a flat inclusion in an elastic solid is studied. The problem is reduced to solve a set of standard Cauchy_type singular equations. And the stress intensity factors at points of crack and inclusion were obtained. Besides, the singularity for the horizontal contact of crack and inclusion was analyzed. The calculating model put forward can be regarded as a new technique for studying the crack and its expanding caused by inclusion tip. Then several numerical examples are given.

利用单根裂纹和单根夹杂的基本解 ,通过弹性力学的线性叠加原理 ,将平面裂纹和夹杂相互作用的问题归结为解一组带有柯西型奇异积分的积分方程组 ,计算了裂纹和夹杂端点的应力强度因子· 给出了一些数值例子· 并对夹杂和裂纹水平接触时的情形作了奇性分析· 结果可作为研究夹杂尖端引起的裂纹及其扩展的工程分析的计算模型

 
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