The recent work has been made possible by new techniques of molecular biology that allow viral DNA to be detected at low concentrations in the environment.
分子生物学的新技术使最近的工作成为可能，这种新技术能在环境中检测到低浓度的病毒DNA。
Even caffeine, which is generally known only for its stimulatory effects, displays this property, depressing mouse locomotion at very low concentrations and stimulating it at higher ones.
就连人们通常觉得有刺激作用的咖啡因，也表现出了这种特性，它在浓度极低的情况下会抑制老鼠的运动，而在浓度较高的情况下则会刺激老鼠。
These areas have particularly low concentrations of iron, and oceanographers hypothesize that this shortage of iron prevents plankton from thriving.
这些地区的铁含量特别低，海洋学家推测，铁的缺乏阻碍了浮游生物的繁殖。
Even relatively low concentrations of air pollutants have been related to a range of adverse health effects.
即便空气污染物的浓度相对偏低，它也与一系列的健康副效应相关。
Farm animals were long raised outdoors in relatively low concentrations, but that changed dramatically in the 20th century.
农场里的家畜长时间在室外散养，养殖密度低，但是二十世纪以来情况发生了显著的变化。
Ideal for samples containing low concentrations of sulfur or other active compounds.
适用于低浓度的含硫化物与活性物质的采样与进样。
Among them, the lead had toxic effects on plants and human health even at low concentrations.
铅甚至在低浓度下对植物有毒害作用，而且会对人的身体健康造成极大的危害。
The experiments showed that low concentrations of ADO improved the resistance of plant seedlings.
表明低浓度的褐藻胶寡糖有利于提高植物幼苗的抗性。
At low concentrations it can have a positive effect on cells, but a negative effect at high concentrations.
低浓度条件下对细胞有积极作用，反之则有负面影响。
The alternating-doping profile region may include alternating regions of high and low concentrations of a dopant.
交替掺杂形态区域包含高低掺杂浓度的交替区域。
It was observed early that low concentrations of sodium bisulfite treatment increased net photosynthetic rate in leaves.
人们很早就已观察到低浓度亚硫酸氢钠处理能提高叶片净光合速率。
Results: All immunized mice developed high titers of serum antibodies to ZP and low concentrations of serum estradiol(P< 0.01 ).
结果：免疫小鼠外周血抗ZP抗体滴度明显高于对照组（P＜0．01），而雌二醇浓度则明显低于对照组（P＜0．01）；
The left image shows high ozone concentrations over most of the planet, but very low concentrations—the ozone hole—over the Arctic.
作图显示了地球上大部分地区都被高浓度的臭氧所覆盖，但在北极上空却有一片极低值区——也就是臭氧洞。
Inorganic Mass Spectrometry is preferably used each time extremely low concentrations and isotopic abundance are to be determined.
每当测定非常低的浓度和同位素丰度时总是首先使用无机质谱法。
At low concentrations ROS induce expression of defence genes and adaptive response, at high concentrations cell death is initiated.
在低浓度时，ROS能诱导防御基因的表达和引起适应反应；在高浓度时，引起细胞死亡。
The results indicate that collagen I, the main organic component of bone, has been preserved in low concentrations in these tissues.
结果显示骨的主要有机成份I型胶原在这些组织中保存下来的浓度很低。
Florfenicol at low concentrations induces the activities of SOD, CAT and POD, while florfenicol at high concentrations inhibits the activities.
低质量比氟苯尼考对SOD,CAT和POD酶活性具有诱导作用，而在高质量比条件下则表现为抑制作用。
In comparison with small chemical drugs, protein and peptide pharmaceuticals have high specificity and activity at relatively low concentrations.
与小分子的化学药物相比，蛋白质和多肽的特点是在相对较低的浓度下就有较高的特异性和活性。
The search process is simple and the results are exact. It is suitable for spectra search, which have low concentrations and unsharp absorption peaks.
具有过程简单，结果比较准确的特点，很适合低浓度，峰形不明显的谱图检索。
Sugars in low concentrations are detected by mass detector, while those in high concentrations are detected by differential reflective index detector.
以质量检测器测定浓度小的糖份，以示差折射率检测器测定浓度大的糖份。
Where you've got residual levels of low concentrations of disinfectant and the resistant organisms are present, they become dominant in the environment.
在可以发现低浓度的消毒剂残留物的地方，同样有耐药性微生物的存在，而这些(耐药性微生物)将在那些环境中占尽优势。
Purification of waste gases containing toluene in low concentrations with high airflow load was preliminarily investigated by using a biotrickling filter.
采用净化甲苯专用菌种对生物膜填料塔净化处理高流量负荷下低浓度甲苯废气的技术进行了初步实验研究。
Although the causality of the effects of low concentrations of SO2 is still uncertain, reducing SO2 concentrations is likely to decrease exposure to co-pollutants.
尽管二氧化硫低浓度效应的因果关系尚不确定，但是，降低二氧化硫浓度很可能减少对混合污染物的暴露。
In places, the ink from the original text is no more than a faint stain, so the scientists studying it need a technique that is sensitive to very low concentrations of ink.
在有些地方原文的墨迹只剩下些微印痕，这使得研究它的科学家需要用能识别超低浓度的墨迹的技术。
CONCLUSION This method is simple, ingenious and accurate with little interference. It is applicable to the determination of some biological samples in low concentrations.
结论本方法简单、灵敏、准确、干扰小，适用于低浓度生物样本的测定。
The biodegradation of waste gases containing toluene in low concentrations with high airflow load was studied in a biotrickling filter using light ceramic cake as the filter material.
以轻质陶块为填料，探讨了生物膜填料塔净化处理高气体流量负荷下低浓度甲苯废气的生物降解性能。
The biodegradation of waste gases containing toluene in low concentrations with high air-flow load was studied in a biotrickling filter using light ceramic cake as the filter material.
该研究以轻质陶块为填料，探讨了生物膜填料塔净化处理高气体流量负荷下低浓度甲苯废气的生物降解性能。
Whether this has a potential for carry over into food at low concentrations (usually in the range of microgram per kilogram) and could further impact human health may need further evaluation.
关于这种情况能否导致少量成分（通常在微克/公斤范围内）进入食物，继而对人类健康产生影响可能还需要进一步的评估。
R6G was incubated in three kinds of silver colloid with different low concentrations, and its surface-enhanced resonance Raman scattering (SERRS) was studied with a confocal microscopy system.
以共焦显微系统为平台，研究了不同浓度的R6G银溶胶的表面增强共振拉曼散射（SERRS）光谱， 结果表明不同浓度溶液中的R6G分子表现出了不同的光谱特性。
R6G was incubated in three kinds of silver colloid with different low concentrations, and its surface-enhanced resonance Raman scattering (SERRS) was studied with a confocal microscopy system.
以共焦显微系统为平台，研究了不同浓度的R6G银溶胶的表面增强共振拉曼散射（SERRS）光谱， 结果表明不同浓度溶液中的R6G分子表现出了不同的光谱特性。
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