Hydrolytic dynamics of pesticide N''-(2,4-dimethylphenyl) -N-methylformamidine in aquatic solution

ＨｙｄｒｏｌｙｔｉｃｄｙｎａｍｉｃｓｏｆｐｅｓｔｉｃｉｄｅＮ＇－（２，４－ｄｉｍｅｔｈｙｌｐｈｅｎｙｌ）－Ｎ－ｍｅｔｈｙｌｆｏｒｍａｍｉｄｉｎｅｉｎａｑｕａｔｉｃｓｏｌｕｔｉｏｎ￥ＭｏＨａｎｈｏｎｇ；ＹａｎｇＫｅｗｕ；ＡｎＦｅｎｇｃｈｕｎ；ＬｉｕＹｅ...     

Effects of fluoride on growth and reproduction of the army worm, Mythimna separata (Walker)

This paper deals with effects of airborne fluorine on the army worm, Mythimna separata (Walker), by rearing the larvae on the wheat foliage exposed to HF or fumigating the larvae on the artificial diet with the pollutant. Larval relative growth rate (GR) and index of population trend of the insect reduced by 5% and 11%, respectively, when the larvae were reared on the foliage taken from the wheat plants exposed to 0.87 g·dm-2·day-1 of fluorine compared with those of the control. An extra instar appeared in a majority of the larvae treated. Survival rate and GR of the larvae on the wheat plant being exposure to the same concentration of fluorine in field open-top fumigation device were 40% and 15% lower than that of the control, respectively. Similar experiment with the insect on the artificial diet also showed that direct impact of the pollutant on the army worm was greater than its indirect effect via their host plant.     

A novel technology for quick acclimation of an anaerobic microbial consortia used for biodegrading teraphthalic acid (TA)

ＩｎｔｒｏｄｕｃｔｉｏｎＴｅｒａｐｈｔｈａｌｉｃａｃｉｄ (ＴＡ)ｉｓｏｎｅｏｆｔｈｅｐｅｔｒｏｃｈｅｍｉｃａｌｓｗｉｄｅｌｙｕｓｅｄｉｎｔｈｅｓｙｎｔｈｅｓｉｓｏｆｐｏｌｙｅｓｔｅｒｆｉｂｅｒ,ｖｉｄｅｏｆｉｌｍｓａｎｄｏｔｈｅｒａｐｐｌｉｃａｔｉｏｎｓ .Ｓｉｎｃｅｂｉｓ (2 ｅｔｈｙｌｈｅｘｙｌ)ｐｈｔｈａｌａｔｅ ,ｄｉｅｔｈｙｌｐｈｔｈａｌａｔｅａｎｄｄｉｍｅｔｈｙｌｐｈｔｈａｌａｔｅｈａｖｅｂｅｅｎｃｌａｓｓｉｆｉｅｄａｓｐｒｉｏｒｉｔｙｈａｚａｒｄｏｕｓｃｏｍｐｏｕｎｄｓｂｙＥＰＡｏｆｔｈｅ…     

有机气溶胶的来源与形成研究现状

介绍了有机气溶胶来源与形成的研究现状,从有机气溶胶的化学组成特征、一次有机气溶胶的来源和二次有机气溶胶的形成机制论述其研究进展.一次有机气溶胶主要来源于烹调油烟、机动车排放、生物质燃烧、工业或民用燃油锅炉释放出的有机物,还有道路扬尘、沥青、刹车尘、轮胎屑、室外香烟烟雾、以及高等植物蜡、细菌活动和草本植物等.大气中的半挥发性有机物可通过物理和化学吸附形成二次有机气溶胶,一些挥发性有机物可通过气相化学反应转化为低挥发性的物质并形成二次有机气溶胶,其主要前体物是芳香族化合物,如苯、甲苯、二甲苯,以及烯烃、烷烃、环烷烃、萜烯和生物排放的非饱和氧化物.     

Effect of free-air CO2 enrichment on nematode communities in a Chinese farmland ecosystem

At a rice-wheat rotational free-air CO2 enrichment(FACE) platform, the effect of elevated atmospheric CO2 on soil nematode communities in a farmland ecosystem was studied. Wheat plots were exposed to elevated atmospheric CO2 (ambient 370 μl/L 200 μl/L).32 families and 40 genera of nematode were observed in soil suspensions during the study period. Under FACE treatment, the numbers of total nematodes, bacterivores and fungivores exhibited an increasing trend. Because of the seasonal variation of soil temperature and moisture, the effect of elevated atmospheric CO2 on soil nematodes was only observed under favorable conditions. The response of nematode communities to elevated atmospheric CO2 may indicate the change of soil food web.     

UV-B辐射对小麦叶抗氧化系统的影响

研究了温室种植的小麦在０（ＣＫ）、８．８２ｋＪ／ｍ＾２（Ｔ１）和１２．６ｋＪ／ｍ＾２（Ｔ２）三种剂量的紫外线Ｂ（ＵＶ－Ｂ）辐射下抗氧化系统的变化及其原因。ＵＶ－Ｂ辐射诱导了Ｈ２Ｏ２的合成，还原型抗坏血酸和还原型谷胱甘肽含量的增加、过氧化氢酶、愈创木酚过氧化物酶、抗坏血酸过氧化物酶和谷胱甘肽还原酶活性升高，而类胡萝卜素稍有所降低、超氧歧化酶（ＳＯＤ）活几乎不受ＵＶ－Ｂ辐射影响，分析表明，ＵＶ－Ｂ辐射     

Cobalt in alluvial Egyptian soils as affected by industrial activities

ＩｎｔｒｏｄｕｃｔｉｏｎＩｎｎａｔｕｒｅＣｏｏｃｃｕｒｓｉｎｔｗｏｏｘｉｄａｔｉｏｎｓｔａｔｅｓ ,Ｃｏ2 + ａｎｄＣｏ3+ ,ａｎｄｆｏｒｍａｔｉｏｎｏｆｔｈｅｃｏｍｐｌｅｘａｎｉｏｎＣｏ(ＯＨ) - 3 ｉｓａｌｓｏｐｏｓｓｉｂｌｅ .ＤｕｒｉｎｇｗｅａｔｈｅｒｉｎｇＣｏｉｓｒｅｌａｔｉｖｅｌｙｍｏｂｉｌｅｉｎｏｘｉｄｉｚｉｎｇａｃｉｄｅｎｖｉｒｏｎｍｅｎｔ,ｂｕｔｄｕｅｔｏａｈｉｇｈｓｏｒｐｔｉｏｎｂｙＦｅａｎｄＭｎｏｘｉｄｅｓ,ａｓｗｅｌｌａｓｂｙｃｌａｙｍｉｎｅｒａｌｓ,ｔｈｉｓｍｅｔａｌｄｏｅｓｎｏｔｍ…     

利用干酪根固体~(13)C核磁共振法研究下古生界碳酸盐岩的热演化程度

应用固体~(13)C－NMR技术对下古生界,海相碳酸盐岩干酪根的化学组成和结构特征进行研究，提出应用该技术所测算的干酪根结构参数“芳核平均结构尺寸”能较准确地反映碳酸盐岩的热成熟度。首次提出芳核平均结构尺寸与镜质体反射率之间的关系在干酪根的热演化过程中具有“三段式”特征。利用这一成果对华北地区下古生界成熟度进行了测定，与地质背景甚为吻合。     

温度对氨法脱硫率影响的实验研究

对使用氨（NH3）脱除烟气中气态污染物的技术进行了分析和总结，认为氨洗涤法洗涤净化烟气是一种很有前景的方法，并就温度对SO2脱除率的影响进行了实验研究。实验研究结果显示，当温度超过54℃时，NH3对SO2仍有很高的脱除率。并根据实验结果建议，在实际氨法脱硫工程中，脱硫过程温度宜控制在60℃以下或在80℃以上。     

Characteristics and source apportionment of PM2.5 under the dual influence of the Spring Festival and the COVID-19 pandemic in Yuncheng city

Based on the online and membrane sampling data of Yuncheng from January 1st to February 12th, 2020, the formation mechanism of haze under the dual influence of Spring Festival and COVID-19 (Corona Virus Disease) was analyzed. Atmospheric capacity, chemical composition, secondary transformation, source apportionment, backward trajectory, pollution space and enterprise distribution were studied. Low wind speed, high humidity and small atmospheric capacity inhibited the diffusion of air pollutants. Four severe pollution processes occurred during the period, and the pollution degree was the highest around the Spring Festival. In light, medium and heavy pollution periods, the proportion of SNA (SO₄²⁻, NO₃⁻ and NH₄⁺) was 59.6%, 56.0% and 54.9%, respectively, which was the largest components of PM_2.5; the [NO₃⁻]/[SO₄²⁻] ratio was 2.1, 1.5 and 1.7, respectively, indicating that coal source had a great influence; the changes of NOR (nitrogen oxidation ratio, 0.44, 0.45, 0.61) and SOR (sulphur oxidation ratio, 0.40, 0.49, 0.65) indicated the accumulation of secondary aerosols with increasing pollution. The coal combustion, motor vehicle, secondary inorganic sources and industrial sources contributed 36.8%, 26.59%, 11.84% and 8.02% to PM_2.5 masses, respectively. Backward trajectory showed that the influence from the east was greater during the Spring Festival, and the pollutants from the eastern air mass were higher, which would aggravate the pollution. Meteorological and Spring Festival had a great impact on heavy pollution weather. Although some work could not operate due to the impact of the COVID-19 epidemic, the emission of pollutants did not reduce much.