نتایج جستجو برای: international wetland

تعداد نتایج: 318770  

2013
R. Wania J. R. Melton E. L. Hodson B. Poulter B. Ringeval R. Spahni T. Bohn C. A. Avis G. Chen A. V. Eliseev P. O. Hopcroft W. J. Riley Z. M. Subin H. Tian P. M. van Bodegom T. Kleinen Z. C. Yu J. S. Singarayer S. Zürcher D. P. Lettenmaier D. J. Beerling S. N. Denisov C. Prigent F. Papa

The Wetland and Wetland CH4 Intercomparison of Models Project (WETCHIMP) was created to evaluate our present ability to simulate large-scale wetland characteristics and corresponding methane (CH4) emissions. A multi-model comparison is essential to evaluate the key uncertainties in the mechanisms and parameters leading to methane emissions. Ten modelling groups joined WETCHIMP to run eight glob...

Journal: :Advances in space research : the official journal of the Committee on Space Research 2001
M Nelson H T Odum M T Brown A Alling

Bioregenerative life support technologies for space application are advantageous if they can be constructed using locally available materials, and rely on renewable energy resources, lessening the need for launch and resupply of materials. These same characteristics are desirable in the global Earth environment because such technologies are more affordable by developing countries, and are more ...

2015
Ronny Merken Evelien Deboelpaep Joachim Teunen Santiago Saura Nico Koedam Roberto Ambrosini

To complete their life cycle waterbirds rely on patchily distributed and often ephemeral wetlands along their migration route in a vast unsuitable matrix. However, further loss and degradation of remaining wetland habitats might lead to a configuration and size of stopovers that is no longer sufficient to ensure long-term survival of waterbird populations. By identifying optimal conservation ta...

Journal: :iranian journal of toxicology 0
محمدرضا وصالی ناصح mohammad reza vesali naseh , university of tehran, tehran, iran. عبدالرضا کرباسی abdolreza karbassi , university of tehran, tehran, iran. فریدون غضبان fereydoon ghazaban , university of tehran, tehran, iran. اکبر باغوند akbar baghvand , university of tehran, tehran, iran.

background: evaluation of heavy metals as toxic pollutants in environment has a significant importance in environmental pollution studies. surficial sediments of water resources have a high potential in releasing heavy metals to the upper water environment, hence sediment analysis presents guidelines to the authorities for monitoring the environmental systems. methods: in this study, total and ...

Journal: :تحقیقات نظام سلامت 0
حمیدرضا تشیعی رئیس مرکز تحقیقات و خودکفایی صنعتی، شرکت مهندسی آب و فاضلاب کشور مختار مهدوی فوق لیسانس مهندسی بهداشت محیط، کارشناس مرکز تحقیقات و خودکفایی صنعتی، شرکت مهندسی آب و فاضلاب کشور فرهام کرکانی فوق لیسانس مهندسی بهداشت محیط، مدیر پدافند غیرعامل شرکت مهندسی آب و فاضلاب کشور سید وحید غلمانی کارشناس عمران ، مسئول تصفیه خانه فاضلاب شهر یزد حسین عطائی فر سرپرست دفتر تحقیقات و خودکفایی صنعتی شرکت مهندسی آب و فاضلاب کشور

background: selection of different wastewater treatment methods depends on the kind of wastewater, geographical position of the community, quantity and quality of wastewater and effluent, technology and finance. natural wastewater treatment methods are simple, cheap and acceptable for developing countries specially small and remote countries and wetland is one of these methods. wetlands include...

2002
Valerie J. Brady Bradley J. Cardinale Joseph P. Gathman Thomas M. Burton

We used wetland mesocosms (1) to experimentally assess whether inoculating a restored wetland site with vegetation/sediment plugs from a natural wetland would alter the development of invertebrate communities relative to unaided controls and (2) to determine if stocking of a poor invertebrate colonizer could further modify community development beyond that due to simple inoculation. After filli...

Journal: :Environmental science & technology 2006
Jeff D Jeremiason Daniel R Engstrom Edward B Swain Edward A Nater Brian M Johnson James E Almendinger Bruce A Monson Randy K Kolka

Atmospheric mercury is the dominant Hg source to fish in northern Minnesota and elsewhere. However, atmospherically derived Hg must be methylated prior to accumulating in fish. Sulfate-reducing bacteria are thought to be the primary methylators of Hg in the environment. Previous laboratory and field mesocosm studies have demonstrated an increase in methylmercury (MeHg) levels in sediment and pe...

Journal: :international journal of environmental research 2014
h. sereshti s. bakhtiari r. toghyani s. samadi t. besharati-seidani

the ultrasound assisted emulsification microextraction (usaeme) method followed byinductively coupled plasma-atomic emission spectrometry (icp-aes) was used for preconcentration anddetermination of bismuth (bi), indium (in) and lead (pb) in the plant azolla filiculoides lam. calix [4] pyrrole was used as a chelating agent and tetrachloroethylene was selected as extraction solvent. the main para...

Journal: :international journal of environmental research 0
h. sereshti department of chemistry, faculty of science, university of tehran, tehran, iran s. bakhtiari department of chemistry, faculty of science, university of tehran, tehran, iran r. toghyani department of chemistry, faculty of science, university of tehran, tehran, iran s. samadi department of chemistry, faculty of science, university of tehran, tehran, iran t. besharati-seidani department of chemistry, faculty of science, university of guilan, 41335-1914, rasht, iran n.o. mahmoodi department of chemistry, faculty of science, university of guilan, 41335-1914, rasht, iran

the ultrasound assisted emulsification microextraction (usaeme) method followed byinductively coupled plasma-atomic emission spectrometry (icp-aes) was used for preconcentration anddetermination of bismuth (bi), indium (in) and lead (pb) in the plant azolla filiculoides lam. calix [4] pyrrole was used as a chelating agent and tetrachloroethylene was selected as extraction solvent. the main para...

Journal: :iranian journal of toxicology 0
محبوبه نوذری mahboubeh nozari marine science, tarbiat modares university, noor, iran. عباس اسماعیلی ساری abbas esmaili-sari marine science, tarbiat modares university, noor, iran. علیرضا ریاحی بختیاری alireza riyahi-bakhtiyari marine science, tarbiat modares university, noor, iran. جابر اعظمی jaber aazami marine science, tarbiat modares university, noor, iran.

background: mercury (hg) is a major environmental contaminant due to its global ubiquity, tendency to bioaccumulate, and toxicity in wildlife. mercury accumulation in wetlands threatens critical breeding and foraging habitats of many fish and wildlife species. in this study, mercury concentrations were detected in different tissues of pike. methods: to achieve these purposes, 58 pikes (esox luc...

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