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本课题对模拟废水中RDX在紫外光和氧化剂等作用下的光化学降解情况进行了研究.运用正交设计法来安排实验,获得了废水的酸碱度、过氧化氢与亚铁离子的投加量、紫外光照射的时间等RDX降解的最佳条件.自行设计了光化学降解装置.在最佳条件下对RDX模拟废水进行光化学处理,并利用721分光光度计以及TOC-500测试仪对实验结果进行鉴定,取得了较为满意的结果. 相似文献
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长波紫外线对M13mp2噬菌体的致突变作用 总被引:2,自引:0,他引:2
以野生型大肠菌CSH50及mutM缺陷的大肠菌MF67为宿主,检测了长波紫外线(UVA)对M13mp2噬菌体单链DNAlacZα基因区域的致突变能力。结果显示,UVA照射可引起噬菌体lacZα基因区域的突变,在mutM缺陷的宿主中,UVA照射的致突变作用更明显。进一步研究了抗氧化剂甘露醇对UVA照射致突变作用的影响,结果显示,0.1mol/L的甘露醇可以部分拮抗UVA的致突变作用。说明UVA照射具有致突变作用,这种作用可能与DNA的氧化损伤有关 相似文献
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ABSTRACTTwo microalgal strains (Chlorella sorokiniana, A&B,) grown optimally at pH 9 (A) and 7 (B) were isolated from a municipal wastewater treatment plant. These strains were used to check their efficacy for nutrients and organic carbon removal capacities from the tertiary wastewater. The strains were characterised using 18S rDNA sequencing method and both the strains closely related to Chlorella sorokiniana. Different inoculum doses (IDs) of both the strains were tried to check their efficacy on wastewater treatment. Due to the increase in the IDs, hydraulic retention time decreased from 6 d to 1?d. On an average, 12–100% of total kjeldahl nitrogen, 53–96% NO3–N, and 59–92% PO4–P, were removed. Despite the same growth environment, strain A with the highest ID (700?mg/L) showed the best performance in terms of overall organic carbon removal, nutrient removal, and value-added products recovery. Strain A showed an increase in carbohydrate and protein content by 42% and 13%, respectively. Both the strains showed luxury phosphorus uptake and found suitable for advanced wastewater treatment. 相似文献
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Introduction: Night work requires inversion of the natural, diurnal human activity-rest cycle and is associated with decreased alertness and some measures of performance, reduced safety, adverse health effects, and chronic disruption of the melatonin cycle that has been associated with increased risk for several major diseases. Previous studies show that red light exposures at night can promote alertness and improve performance while not negatively affecting melatonin secretion. Method: This ongoing crossover, mixed (within- and between-subjects) design field study is testing the efficacy and acceptance of red light delivered to day-shift and night-shift workers using personal light glasses while they are at work. Each participant experienced three lighting interventions at the eyes: red light (50 lx, 630 nm, the treatment intervention), blue light (50 lx, 460 nm, the positive control intervention), and dim white light (10 lx, 3,000 K, the placebo control). During the interventions, participants underwent visual performance testing, submitted salivary melatonin and cortisol samples, and provided subjective reports of sleepiness, sleep disturbance, and general health over the 20-week protocol. Due to the ongoing nature of the study, only the performance and subjective reports are presented here. Results: Preliminary results indicate that response times were improved by the red and blue interventions, but not accuracy and hit rates. Blue light was associated with improvements to self-reported sleep disturbances compared to dim light. Conclusions: These field results partially support our laboratory results that showed a positive effect of red light for promoting alertness and certain performance outcomes during the day and at night. Practical Applications: Red light may be used to improve response times in shift workers. Continued research will elucidate the lighting interventions’ effects on melatonin and objective sleep measures (actigraphy). 相似文献
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不同原理分析仪观测大气中氮氧化物对比研究 总被引:4,自引:0,他引:4
氮氧化物(NOx)是大气二次光化学污染臭氧的重要前体物,但目前对其总量和分量的测量仍存在着一些难以解决的问题。选择3种不同原理的市售氮氧化物分析仪在广东和北京进行比对观测实验,从而比较其各自的优缺点及适用性。结果表明,钼转化法(MC)测得的NOx比光转化法(LC)及液相化学发光法(LPC)所测得的值都明显偏高,可近似认为是NOy。LPC检测NO2时受到PAN等含有—NO2生色基团的干扰,结果比LC略高。LC测得的NOx值与实际大气最为接近。MC测定的NOx比实际值高,但能满足空气质量指标监测的需求;LC能够准确测定大气中的NOx,但造价太高,仅适用于大气化学机理研究;而LPC原理的仪器适合于短时间的航测、高塔和系留艇进行垂直梯度观测。 相似文献