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000052639 084__ $$2WoS$$aSoil Science
000052639 1001_ $$0P:(DE-Juel1)VDB35187$$aZielezny, Y.$$b0$$uFZJ
000052639 245__ $$aImpact of sulfadiazine and chlorotetracycline on soil bacterial community  structure and respiratory activity
000052639 260__ $$aAmsterdam [u.a.]$$bElsevier Science$$c2006
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000052639 440_0 $$08461$$aSoil Biology and Biochemistry$$v38$$x0038-0717
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000052639 520__ $$aVeterinary medicines enter agricultural soils by the use of animal excrements as fertilizers. To study their impact on soil bacterial communities, microcosms containing orthic luvisol soil were spiked with the antimicrobial agents sulfadiazine (SDZ) and chloro tetracycline (CTC) at three different concentrations (1, 10, 50 mg kg(-1) soil) and incubated for 48 days at 20 degrees C. The impact on the microbial respiratory activity was measured continuously in a respirometer (Sapromat). Changes in bacterial community structure were visualized by means of PCR-denaturing gradient gel electrophoresis (DGGE) of 16S rDNA derived from soil samples after 1, 7, 11 and 48 days. Additionally, growth inhibitory effects of SDZ and CTC on bacteria previously isolated from the same soil were tested in agar diffusion tests. In microcosms with soil and antibiotics only, no effects could be observed, either on respiratory activity or on bacterial population structure. Therefore, further incubations were conducted in the presence of an additional assimilable carbon source (5 g glucose kg(-1) soil). In the presence of glucose, SDZ affected soil respiration as well as the bacterial community structure: Additional bands appeared and some bands already visible at the beginning of incubations increased in intensity. A clear relationship between SDZ concentrations and changes in DGGE patterns became visible. During 48 days of incubation, changes in DGGE patterns were minimal in microcosms with 50 mg SDZ kg(-1) soil indicating an inhibition of strains, which were capable of growing on glucose in the presence of lower SDZ concentrations. Only a few soil bacterial isolates (5 out of 47 strains tested) were weakly inhibited by SDZ in agar diffusion disk tests. Contrastingly, CTC inhibited growth of 12 soil bacterial isolates significantly in disk tests, but no effects on soil respiration and bacterial community structure could be observed. In the presence of the soil matrix the growth inhibitory potential of CTC decreased due to adsorption or complexation. This was confirmed in growth inhibition experiments with soil suspensions and time-dependent sampling. (c) 2006 Elsevier Ltd. All rights reserved.
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000052639 65320 $$2Author$$aantibiotics
000052639 65320 $$2Author$$asulfadiazine
000052639 65320 $$2Author$$achlorotetracycline
000052639 65320 $$2Author$$asoil respiration
000052639 65320 $$2Author$$aDGGE
000052639 65320 $$2Author$$abacterial community structure
000052639 65320 $$2Author$$adiversity
000052639 7001_ $$0P:(DE-Juel1)129462$$aGroeneweg, J.$$b1$$uFZJ
000052639 7001_ $$0P:(DE-Juel1)129549$$aVereecken, H.$$b2$$uFZJ
000052639 7001_ $$0P:(DE-Juel1)129545$$aTappe, W.$$b3$$uFZJ
000052639 773__ $$0PERI:(DE-600)1498740-5$$a10.1016/j.soilbio.2006.01.031$$gVol. 38, p. 2372 - 2380$$p2372 - 2380$$q38<2372 - 2380$$tSoil biology & biochemistry$$v38$$x0038-0717$$y2006
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