排序方式: 共有66条查询结果,搜索用时 15 毫秒
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Walter Pribil Peter Gehringer Helmut Eschweiler Alexander Cabaj Thomas Haider Regina Sommer 《Water environment research》2007,79(7):720-724
Gamma and electron-beam irradiation of Bacillus subtilis spores suspended in different types of water was studied to evaluate the inactivation of the spores and assess their possible use as a bioindicator for radiation processing. We found that the inactivation proceeded endogenously, being dose-rate-dependent and affected by oxygen. The radiation resistance of the suspended spores was found to be rather high; therefore, B. subtilis spores used as a bioindicator for efficiency of water treatment by radiation under practical conditions might result in the spores being overly conservative surrogates for pathogenic microorganisms. Moreover, the doserate dependency impedes the use of the spores as a bioindicator. Thus, B. subtilis spores cannot be recommended as a bioindicator for evaluation of the microbicidal efficacy of ionizing radiation processing of water. 相似文献
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Cyanobacterial toxins: a growing environmental concern 总被引:34,自引:0,他引:34
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Parekh PP Khwaja HA Khan AR Naqvi RR Malik A Khan K Hussain G 《Environmental monitoring and assessment》2002,74(3):255-262
Pakistan is one of the few countries in Asia thatcontinues to use only leaded-petrol as vehicular fuel. Theconcentration of Pb in its petrol reported in 1991 was thehighest (1.5 – 2.0 g Pb L-1) of all produced by the various Asiancountries and far exceeded the WHOs guideline of 0.15 g Pb L-1. We have undertaken a study to trace and quantify this toxicelement in the environs of Karachi, Pakistans major metropolis,having more than 30% of the nations total number of vehicles.In this article we report the Pb contents of petrol and dieselcurrently manufactured and marketed in the city. Samples of`Regular petrol collected in 1999 was found to contain 0.363 gPb L-1 (range: 0.335 – 0.390 g Pb L-1), a factor of 5 lower than thatmarketed prior to 1991. Its concentration in diesel fuel was muchlower (0.017 g Pb L-1). Based on the available statistical data onthe type and volume of vehicular traffic, we assessed that thecurrent lead emission from vehicular traffic into the atmosphereis 391 metric tons a year, which is a factor of 2.7 lower thanthat estimated for 1989. 相似文献
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Tina Heger Anna T. Pahl Zoltan Botta-Dukát Francesca Gherardi Christina Hoppe Ivan Hoste Kurt Jax Leena Lindström Pieter Boets Sylvia Haider Johannes Kollmann Meike J. Wittmann Jonathan M. Jeschke 《Ambio》2013,42(5):527-540
Invasion ecology has much advanced since its early beginnings. Nevertheless, explanation, prediction, and management of biological invasions remain difficult. We argue that progress in invasion research can be accelerated by, first, pointing out difficulties this field is currently facing and, second, looking for measures to overcome them. We see basic and applied research in invasion ecology confronted with difficulties arising from (A) societal issues, e.g., disparate perceptions of invasive species; (B) the peculiarity of the invasion process, e.g., its complexity and context dependency; and (C) the scientific methodology, e.g., imprecise hypotheses. To overcome these difficulties, we propose three key measures: (1) a checklist for definitions to encourage explicit definitions; (2) implementation of a hierarchy of hypotheses (HoH), where general hypotheses branch into specific and precisely testable hypotheses; and (3) platforms for improved communication. These measures may significantly increase conceptual clarity and enhance communication, thus advancing invasion ecology. 相似文献
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Rej Soumen Bandyopadhyay Arunava Mahmood Haider Murshed Muntasir Mahmud Sakib 《Environmental science and pollution research international》2022,29(24):35862-35883
Environmental Science and Pollution Research - India is predominantly a fossil fuel-intensive South Asian country that has traditionally settled for higher economic gains at the expense of lower... 相似文献
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Hassan Muhammad Shahid Mahmood Haider Javaid Anam 《Environmental science and pollution research international》2022,29(30):45204-45220
Environmental Science and Pollution Research - Energy plays a vital role in promoting sustainable economic development in complex societies. This study has analyzed the impact of electricity... 相似文献
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Husnain Husnain I. G. Putu Wigena Ai Dariah Setiari Marwanto Prihasto Setyanto Fahmuddin Agus 《Mitigation and Adaptation Strategies for Global Change》2014,19(6):845-862
With the increasing use of tropical peatland for agricultural development, documentation of the rate of carbon dioxide (CO2) emissions is becoming important for national greenhouse gas inventories. The objective of this study was to evaluate soil-surface CO2 fluxes from drained peat under different land-use systems in Riau and Jambi Provinces, Sumatra, Indonesia. Increase of CO2 concentration was tracked in measurement chambers using an Infrared Gas Analyzer (IRGA, LI-COR 820 model). The results showed that CO2 flux under oil palm (Elaeis guineensis) plantations ranged from 34?±?16 and 45?±?25 Mg CO2 ha–1 year–1 in two locations in Jambi province to 66?±?25 Mg CO2 ha–1 year–1 for a site in Riau. For adjacent plots within 3.2 km in the Kampar Peninsula, Riau, CO2 fluxes from an oil palm plantation, an Acacia plantation, a secondary forest and a rubber plantation were 66?±?25, 59?±?19, 61?±?25, 52?±?17 Mg ha–1 year–1, respectively, while on bare land sites it was between 56?±?30 and 67?±?24 Mg CO2 ha–1 year–1, indicating no significant differences among the different land-use systems in the same landscape. Unexplained site variation seems to dominate over land use in influencing CO2 flux. CO2 fluxes varied with time of day (p?<?0.001) with the noon flux as the highest, suggesting an overestimate of the mean flux values with the absence of night-time measurements. In general, CO2 flux increased with the depth of water table, suggesting the importance of keeping the peat as wet as possible. 相似文献
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Buledi Jamil Ahmed Amin Sidra Haider Syed Iqleem Bhanger Muhammad Iqbal Solangi Amber R. 《Environmental science and pollution research international》2021,28(42):58994-59002
Environmental Science and Pollution Research - The extensive release of heavy metals into the natural water bodies has become globally prevalent from past few decades. Heavy metal toxicity is... 相似文献