石油化工企业灭火中的环境保护

针对近几年来连续发生的石化企业重大火灾后污染水源的恶性事故,在此从消防部队的角度对消防污水的产生与特点进行了探讨,阐述了灭火战斗中注意的问题以及消防污水紧急处置的措施,对石化企业的防火设计及消防监管提出了一些建议,希望消防工作者在致力于消防事业时,同时树立强烈的环保意识,将保护环境作为消防工作的又一目标,力求避免因火灾引发的突发环境事件造成政治、经济和社会方面的重大影响.     

地气溶胶测量──一种寻找隐伏矿床、研究深部构造地质的新方法、新技术

介绍了地气溶胶测量的概念及其测量方法，从地气溶胶组分及元素的赋存状态、来源及其可能的迁移特性，讨论了地气溶胶测量的原理。根据最近几年在矿区外围及未知地区所测量的一些实例，论述了利用该方法寻找隐伏矿床的效果，认为地气溶胶测量在寻找隐伏矿床、研究深部构造地质方面具有广阔的应用和发展前景。     

A Simulation of Temporal and Spatial Variations in Carbon at Landscape Level: A Case Study for Lake Abitibi Model Forest in Ontario,Canada

Using a case study of the Lake Abitibi Model Forest (LAMF), this study aims to assess the temporal and spatial variability in carbon storage during 1990–2000, and to present a comprehensive estimation of the carbon budget for LAMF's ecosystems. As well, it provided the information needed by local forest managers to develop ecological and carbon-based indicators and monitor the sustainability of forest ecosystems. Temporal and spatial carbon dynamics were simulated at the landscape level using ecosystem model TRIPLEX1.0 and Geographical Information System (GIS). The simulated net primary productivity (NPP) and carbon storage in forest biomass and soil were compared with field data and results from other studies for Canada's boreal forests. The results show that simulated NPP ranged from 3.26 to 3.34 tC ha⁻¹ yr⁻¹ in the 1990s and was consistent with the range measured during the Boreal Ecosystem-Atmosphere Studies (BOREAS) in central Canada. Modeled NPP was also compared with the estimation from remote sensing data. The density of total above-and belowground biomass was 125.3, 111.8, and 106.5 tC ha⁻¹ for black spruce, trembling aspen, and jack pine in the LAMF ecosystem, respectively. The total carbon density of forested land was estimated at 154.4 tC ha⁻¹ with the proportion of 4:6 for total biomass and soil. The analysis of net carbon balance of ecosystem suggested that the LAMF forest ecosystem was acting as a carbon sink with an allowable harvest in the 1990s.     

绿色贸易壁垒若干问题的探讨

分析了国际贸易中绿色贸易壁垒的成因，即环境问题的全球化、社会化以及西方国家第三次贸易保护主义浪潮的兴起；介绍了这种新兴的技术性壁垒的基本形式，包括环境标准和法规、环境标志制度及其门槛提高、成本内在化与绿色补贴、包装的环保要求等；最后对绿色贸易壁垒的一些特点作了客观性的评价。     

Cells of the connective tissue differentiate and migrate into pollen sacs

In angiosperms, archesporial cells in the anther primordium undergo meiosis to form haploid pollen, the sole occupants of anther sacs. Anther sacs are held together by a matrix of parenchyma cells, the connective tissue. Cells of the connective tissue are not known to differentiate. We report the differentiation of parenchyma cells in the connective tissue of two Gordonia species into pollen-like structures (described as pseudopollen), which migrate into the anther sacs before dehiscence. Pollen and pseudopollen were distinguishable by morphology and staining. Pollen were tricolpate to spherical while pseudopollen were less rigid and transparent with a ribbed surface. Both types were different in size, shape, staining and surface architecture. The ratio of the number of pseudopollen to pollen was 1:3. During ontogeny in the connective tissue, neither cell division nor tetrad formation was observed and hence pseudopollen were presumed to be diploid. Only normal pollen germinated on a germination medium. Fixed preparations in time seemed to indicate that pseudopollen migrate from the connective tissue into the anther sac.     

菊酯类农药酶联免疫吸附测定研究进展

介绍了菊酯类农药残留的酶联免疫分析(ELISA)的技术原理、关键技术环节,综述了国内外的酶联免疫测定菊酯类农药残留的研究动态,并展望了此技术的发展及应用前景。     

非程序升温色谱法分析CO/CO2加氢反应混合物

在非程序升温单桩色谱仪上，采用双柱温法对ＣＯ／ＣＯ２加氢反应混合物进行在线分析，设置条件为３ｍ长的色谱柱ＧＤＸ－４０３，柱前压和检测温度固定不变，氢气为载气，ＴＣＤ为检测器，结果表明：在柱温３１３Ｋ，可以分析ＣＯ、ＣＨ４、ＣＯ２。在柱温３６８Ｋ，可以分析Ｈ２Ｏ和甲醇。通过计算反应前后２组物质浓度的变化，可以快速、准确评价催化剂的活性和选择性。     

淮河流域多闸坝河流COD综合衰减系数测算

提出在多闸坝河流上，利用枯水期断面化学需氧量同步监测数据测算COD综合衰减系数的方法，用该方法测算河南省辖河流域部分河流COD综合减系数在0．08－0．341/d。并用实际监测结果进行检验。     

Sex-dependent obesogenic effect of tetracycline on Drosophila melanogaster deteriorated by dysrhythmia

Antibiotics have been identified as obesogens contributing to the prevalence of obesity. Moreover, their environmental toxicity shows sex dependence, which might also explain the sex-dependent obesity observed. Yet, the direct evidence for such a connection and the underlying mechanisms remain to be explored. In this study, the effects of tetracycline, which is a representative antibiotic found in both environmental and food samples, on Drosophila melanogaster were studied with consideration of both sex and circadian rhythms (represented by the eclosion rhythm). Results showed that in morning-eclosed adults, tetracycline significantly stimulated the body weight of females (AM females) at 0.1, 1.0, 10.0 and 100.0 µg/L, while tetracycline only stimulated the body weight of males (AM males) at 1.0 µg/L. In the afternoon-eclosed adults, tetracycline significantly stimulated the body weight of females (PM females) at 0.1, 1.0 and 100.0 µg/L, while it showed more significant stimulation in males (PM males) at all concentrations. Notably, the stimulation levels were the greatest in PM males among all the adults. The results showed the clear sex dependence of the obesogenic effects, which was diminished by dysrhythmia. Further biochemical assays and clustering analysis suggested that the sex- and rhythm-dependent obesogenic effects resulted from the bias toward lipogenesis against lipolysis. Moreover, they were closely related to the preference for the energy storage forms of lactate and glucose and also to the presence of excessive insulin, with the involvement of glucolipid metabolism. Such relationships indicated potential bridges between the obesogenic effects of pollutants and other diseases, e.g., cancer and diabetes.