近40年来福建省水稻土有效磷富集效应及潜在生态风险评估

水稻土磷素流失引起的水体富营养化等生态风险已受到普遍关注,而明确其动态变化和富集效应是制定合理防控措施的基础.以福建省1.8×10⁶ hm²水稻土为研究对象,以1982年全国第二次土壤普查1 471个、 2008年农业农村部测土配方施肥项目215 534个和2018年农业农村部耕地质量监测项目2 895个表层水稻土样点建立的1∶5万三期大比例尺土壤数据库为基础,分析全省水稻土有效磷含量近40年来的富集效应及潜在生态风险.结果表明,1982～2018年间福建省水稻土有效磷含量增加了47 mg·kg^-1,富集面积达到1.65×10⁶ hm²,占全省水稻土总面积的91%;其中,1982～2008年福建省水稻土有效磷含量增加了28 mg·kg^-1,富集面积为1.47×10⁶ hm²,占全省水稻土总面积的82%; 2008～2018年福建省水稻土有效磷含量增加了19 mg·kg^-1,富集面积为1.22...     

臭氧及联用技术在水处理中的应用

介绍国内外臭氧氧化法及其联用技术的最新进展及应用前景。     

厌氧消化数学模型ADM1的研究及应用进展

自2002年国际水协厌氧消化工艺数学模型课题组推出厌氧消化模型ADM1以来,随着研究与应用的深入,该模型不断发展完善,已经被证明是指导厌氧消化工艺设计与模拟、预测厌氧消化过程及结果的可靠工具。总结了近年ADM1在生化反应动力学、不同反应器类型、不同发酵底物、厌氧消化微生物种群等方面的拓展与改进研究,简单介绍了该模型在厌氧消化实际工程中的应用及模型存在的缺陷和不足。     

城市自然灾害应急管理中社会参与的评价研究 ——以太原市为例*

随着我国经济建设与社会建设的较快发展,城市自然灾害应急管理研究得到了越来越多的关注。目前城市自然灾害应急管理的研究多着眼于政府层面,尚未对社会力量在城市自然灾害应急管理中的作用进行详细论证。为研究社会力量在城市自然灾害应急活动中的现状,在坚持政府主导的原则下分析了社会参与在城市自然灾害应急管理中的重要作用,提出了社会力量参与城市自然灾害应急管理的评价指标体系,并进一步构建了基于G1方法的城市应急管理中社会参与的评价模型,对社会参与进行定量化分析。在此基础上,以太原市为例进行了实证研究,根据评价结果了解到太原市社会参与的状况,并找到社会参与做的比较好和存在不足的地方,并提出一些改善意见以提高城市自然灾害应急管理中的社会参与水平。     

China's endemic vertebrates sheltering under the protective umbrella of the giant panda

The giant panda attracts disproportionate conservation resources. How well does this emphasis protect other endemic species? Detailed data on geographical ranges are not available for plants or invertebrates, so we restrict our analyses to 3 vertebrate taxa: birds, mammals, and amphibians. There are gaps in their protection, and we recommend practical actions to fill them. We identified patterns of species richness, then identified which species are endemic to China, and then which, like the panda, live in forests. After refining each species' range by its known elevational range and remaining forest habitats as determined from remote sensing, we identified the top 5% richest areas as the centers of endemism. Southern mountains, especially the eastern Hengduan Mountains, were centers for all 3 taxa. Over 96% of the panda habitat overlapped the endemic centers. Thus, investing in almost any panda habitat will benefit many other endemics. Existing panda national nature reserves cover all but one of the endemic species that overlap with the panda's distribution. Of particular interest are 14 mammal, 20 bird, and 82 amphibian species that are inadequately protected. Most of these species the International Union for Conservation of Nature currently deems threatened. But 7 mammal, 3 bird, and 20 amphibian species are currently nonthreatened, yet their geographical ranges are <20,000 km² after accounting for elevational restriction and remaining habitats. These species concentrate mainly in Sichuan, Yunnan, Nan Mountains, and Hainan. There is a high concentration in the east Daxiang and Xiaoxiang Mountains of Sichuan, where pandas are absent and where there are no national nature reserves. The others concentrate in Yunnan, Nan Mountains, and Hainan. Here, 10 prefectures might establish new protected areas or upgrade local nature reserves to national status.     

Definition of Planarian Mortality in an Acute Toxicity Test: A Case Study on Dugesia japonica Exposed to 1-Octyl-3-methylimidazolium Bromide

In order to define the mortality criteria of planarian objectively,a case study of Dugesia japonica exposed to 1-octyl-3-methylimidazolium bromide([C8mim]Br)was performed followed by a recovery culture.The results showed that defining planarian mortality in light of its body disintegration was appropriate.If the disintegrated tissue of a planarian was more than 1/4 of its body length,it would completely degenerate.However,a planarian would regenerate the lost tissue and return to normal after a few days’recovery culture if the disintegrated part was less than 1/4 of body length.Therefore,we propose to use body disintegration as the endpoint of planarian mortality,i.e.,1/4 body length degenerated is the critical threshold of mortality and survival of planarians when exposed to toxicants.This criterion could be adapted in the standardization of testing protocols and comparability of acute toxicity test or other toxicological research using planarian as the test animal.     

基于模糊综合评估理论的磁铁类玩具风险评估方法研究

磁铁类玩具存在缺陷将威胁到儿童的人身安全,甚至会造成窒息等严重伤害。在磁铁类玩具伤害案例分析的基础上,采用故障树及德尔菲法建立了窒息伤害和磁铁伤害两种伤害模式的风险评估指标体系,并利用G1法进行了指标权重计算。通过对磁铁类玩具伤害风险分析,构造了基于模糊综合评估方法的磁铁类玩具风险评估矩阵,最后通过实证分析,证明该模糊综合评估方法可应用于磁铁类玩具的风险评估。     

醋酸铅对大鼠胰岛瘤细胞INS-1自噬与凋亡的影响

为了研究环境中常见重金属污染物铅对大鼠胰岛瘤细胞INS-1自噬与凋亡的影响及其可能的分子机制,使用不同浓度醋酸铅暴露大鼠胰岛瘤细胞INS-1,利用磺酰罗丹明B(sulforhodamine B,SRB)法检测细胞存活率;Western blot法检测不同浓度醋酸铅对细胞中自噬与凋亡标志蛋白及哺乳动物雷帕霉素靶蛋白(mammalian target of rapamycin,mTOR)信号通路标志分子表达的影响;利用活性氧(reactive oxygen species,ROS)试剂盒检测细胞内ROS水平;用ROS清除剂N-乙酰-L-半胱氨酸(N-acetylcysteine,NAC)预处理细胞,检测醋酸铅引起的细胞自噬与凋亡是否受到影响。使用统计学软件SPSS 17.0对数据进行统计学分析后,与对照组相比,醋酸铅导致INS-1细胞的存活率下降(p0.05),且呈时间-剂量依赖性;随醋酸铅浓度增大,自噬和凋亡标志蛋白表达增加,mTOR信号途径标志分子没有明显变化;NAC预处理后醋酸铅引起的细胞自噬和凋亡减少。实验结果表明,醋酸铅可通过mTOR-非依赖途径诱导INS-1细胞的自噬与凋亡,其可能机制为刺激细胞内ROS的产生。     

An unforgettable event: a qualitative study of the 1997–98 El Niño in northern Peru

During the 1997–98 El Niño, Tumbes, Peru received 16 times the annual average rainfall. This study explores how Tumbes residents perceived the impact of the El Niño event on basic necessities, transport, health care, jobs and migration. Forty‐five individuals from five rural communities, some of which were isolated from the rest of Tumbes during the event, participated in five focus groups; six of these individuals constructed nutrition diaries. When asked about events in the past 20 years, participants identified the 1997–98 El Niño as a major negative event. The El Niño disaster situation induced a decrease in access to transport and health care and the rise in infectious diseases was swiftly contained. Residents needed more time to rebuild housing; recover agriculture, livestock and income stability; and return to eating sufficient animal protein. Although large‐scale assistance minimized effects of the disaster, residents needed more support. Residents' perspectives on their risk of flooding should be considered in generating effective assistance policies and programmes.     

Multistep conversion of cresols by phenol hydroxylase and 2,3-dihydroxy-biphenyl 1,2-dioxygenase

A mulfistep conversion system composed of phenol hydroxylase （PHrND） and 2,3-dihydroxy-biphenyl 1,2-dioxygenase （BphCLA_4） was used to synthesize methylcatechols and semialdehydes from o- and m-cresol for the first time. Docking studies displayed by PyMOL predicted that cresols and methylcatechols could be theoretically transformed by this multistep conversion system~ High performance liquid chromatography mass spectrometry （HPLC-MS） analysis also indicated that the products formed from multistep conversion were the corresponding 3-methylcatechol, 4-methylcatechol, 2- hydroxy-3-methyl-6-oxohexa-2,4-dienoic acid （2- hydroxy-3-methyl-ODA） and 2-hydroxy-5-methyl-6-oxo- hexa-2,4-dienoic acid （2-hydroxy-5-methyl-ODA）. The optimal cell concentrations of the recombinant E. coli strain BL21 （DE3） expressing phenol hydroxylase （PHrND） and 2,3-dihydroxy-biphenyl 1,2-dioxygenase （BphCLA_4） and pH for the multistep conversion of o- and m-cresol were 4.0 （g-L-1 cell dry weight） and pH 8.0, respectively. For the first step conversion, the formation rate of 3- methylcatechol （0.29μmol·L-1·min-1·mg-1cell dry weight） from o-cresol was similarly with that ofmethylca- techols （0.28 μmol·L-1·min-1·mg-1 cell dry weight） from m-cresol by strain PHrND. For the second step conversion, strain BphCLA_4 showed higher formation rate （0.83 μmol·L-1·min-1·mg-1 cell dry weight） for 2-hydroxy-3-methyl- ODA and 2-hydroxy-5-methyl-ODA from m-cresol, which was 1.1-fold higher than that for 2-hydroxy-3-methyl- ODA （0.77 μmol·L-1·min-1·mg-1. mglcell dry weight） from ocresol. The present study suggested the potential application of the multistep conversion system for the production of chemical synthons and high-value products.