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| 1 | Long-term effects of environmentally relevant concentrations of silver nanoparticles on microbial biomass, enzyme activity,and functional genes involved in the nitrogen cycle of loamy soil显示文摘The increasing production and use of engineered silver nanoparticles(AgNP) in industry and private households are leading to increased concentrations of AgNP in the environment. An ecological risk assessment of AgNP is needed, but it requires understanding the long term effects of environmentally relevant concentrations of AgNP on the soil microbiome. Hence, the aim of this study was to reveal the long-term effects of AgNP on soil microorganisms. The study was conducted as a laboratory incubation experiment over a period of one year using a loamy soil and AgNP concentrations ranging from 0.01 to 1 mg AgNP/kg soil. The short term effects of AgNP were, in general, limited.However, after one year of exposure to 0.01 mg AgNP/kg, there were significant negative effects on soil microbial biomass(quantified by extractable DNA; p = 0.000) and bacterial ammonia oxidizers(quantified by amo A gene copy numbers; p = 0.009). Furthermore, the tested AgNP concentrations significantly decreased the soil microbial biomass, the leucine aminopeptidase activity(quantified by substrate turnover; p = 0.014), and the abundance of nitrogen fixing microorganisms(quantified by nif H gene copy numbers; p = 0.001). The results of the positive control with Ag NO3 revealed predominantly stronger effects due to Ag+ion release. Thus, the increasing toxicity of AgNP during the test period may reflect the long-term release of Ag+ions. Nevertheless, even very low concentrations of AgNP caused disadvantages for the microbial soil community, especially for nitrogen cycling, and our results confirmed the risks of releasing AgNP into the environment. | Anna-Lena Grün Susanne Straskraba Stefanie Schulz Michael Schloter Christoph Emmerling | 2018 | Journal of Environmental Sciences2018，30，7： | 7 |
| 2 | Retrospective analysis of transurethral resrction,srcond-look resection,and long-term chemo-metaphlaxis for surperficial bladder cancer:indications and efficacy of a differentiated approach显示文摘 | Schulze M Stotz N Rassweiler J | 2007 | J Endourol2007，21，12： | 1 |
| 3 | Ecological footprint time series of Austria, the Philippines, and South Korea for 1961 - 1999: Comparing the conventional approach to an 'actual land area' approach 显示文摘 | WACKERNAGEL M MONFREDA C ERB KARL- HEINZ HABERL H SCHULZ N B | 2004 | Land Use Policy2004，，21： | 1 |
| 4 | Structure of 2,6-dihydroxy- pyridine 3-hydroxylase from a nicotine-degrading pathway 显示文摘 | Treiber N Schulz G E | 2008 | J Mol Biol2008，379，1： | 1 |
| 5 | Dynamic models of turbine generators derived from solid rotor equivalent circuits显示文摘 | Schulz R P Jones W D Ewart D N | 1973 | IEEE Transactions on Power Apparatus and Systems1973，92，3： | 1 |
| 6 | Synthesis and fluid properties of associating polymer systems 显示文摘 | Schulz D N Boek J J | 1991 | Macromol Sci Chem1991，28，： | 1 |
| 7 | Carbon,water and nutrient relations of two mistletoes and their hosts,a hypothesis显示文摘 | Schulze E D Turner N C Glatzel G | 1984 | Plant Cell Environ1984，143，： | 1 |
| 8 | Aminoguanidine inhibits inducible NOS and reverses cardiac dysfunction late after ischemia and reperfusion-implications for iNOS-mediated myocardial stunning显示文摘 | Schulze C Conrad N | 1999 | Thorac Cardiovasc Surg1999，47，： | 1 |
| 9 | Reducing publication bias of prospective clinical trials through trial registration 显示文摘 | Abaid L N Grimes D A Schulz K F | 2007 | Contraception2007，76，5： | 1 |
| 10 | A multi-agent solution to distribution systems restoration显示文摘 | SOLANKI J M KHUSHALANI S SCHULZ N N | 2007 | IEEETrans on Power Delivery2007，22，3： | 1 |
| 11 | Surface expression of collagen receptor Fc receptor-γ/glycoprotein VI is enhanced on platelets in type 2 diabetes and mediates release of CD40 ligand and activation of endothelial cells显示文摘 | Cabeza N Li Z Schulz C | 2004 | Diabetes2004，53，8： | 1 |
| 12 | Major element geochemistry and geomorphic relationships in Brazilian Cerrado soils显示文摘 | Marques J J Schulze D G Curi N | 2004 | Geoderma2004，119，： | 1 |
| 13 | Trackingthe ecological overshoot of the human economy显示文摘 | WACKERNAGEL M SCHULZ N B DEUMING D | 2002 | Proc Natl Acad Sci2002，99，： | 1 |
| 14 | Surface expression of collagen receptor Fc receptor/Glycoprotein VI is enhanced on platelets in type 2 diabetes and mediates release of CD 40 ligand and activation of endothelial cells 显示文摘 | Cabeza N Zhi L Schulz C | 2004 | Diabetes2004，53，8： | 1 |
| 15 | Calculating national and global ecological footprint time series: Resolving conceptual challenges显示文摘 | WACKERNAGEL M MONFREDA C SCHULZ N B | 2004 | Land Use Policy2004，21，： | 1 |
| 16 | Association of fetuin-A level and diabetes risk 显示文摘 | Stefan N Haring H U Schulze M B | 2008 | JAMA2008，300，19： | 1 |
| 17 | Differential IL-23 requirement for IL-22 and IL-17a production during innate immunity against salmonella enterica serovar enteritidis显示文摘 | Siegemund S Schatze N Schulz S | 2009 | Int Immunol2009，21，5： | 1 |
| 18 | Use ofgraphitised carbon negative ion LC-MS to analyse enzymati-cally digested glycosaminoglycans显示文摘 | Karlsson N G Schulz B L Packer N H | 2005 | J Chromatogr BAnalyt TechnoL Biomed Life Sci2005，824，12： | 1 |
| 19 | Determnation of Young's modulus and yield stress of porous low-k materials by nanoindentation显示文摘 | HERRMANN M SCHWARZER N RICHTER F FRUHAUF S SCHULZ S E | | 0，，07： | 1 |
| 20 | Toward a theory of agency and altruism in family firms显示文摘 | Schulze W S Lubatkin M H Dino R N | 2003 | Journal of Business Venturing2003，18，4： | 1 |
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