Abstract:
:Thymidine and leucine incorporation into macromolecules of soil bacteria extracted by homogenization-centrifugation were measured after size-fractionation of the bacterial suspension through different sized filters (1.0, 0.8, 0.6, 0.4 μm). The specific thymidine incorporation rate was highest for the unfiltered and 1.0 μm filtered suspensions (approximately 10 × 10(-21) mol thymidine bacteria(-1) h(-1)), but decreased to 1.39 × 10(-21) mol bacteria(-1) h(-1) for bacteria passing the 0.4 μm filter. The proportion of culturable bacteria (percent colony forming units/acridine orange direct counts) also decreased with bacterial cell size from 5.0% for the unfiltered bacterial suspension to 0.8% in the 0.4 µm filtrate. A strong linear correlation (r (2) = 0.995) was found between the specific thymidine incorporation rate and the proportion of culturable bacteria. Leucine incorporation gave similar results to the thymidine incorporation. No effects of cell size on the degree of isotope dilution or unspecific labeling of other macromolecules were found either for the thymidine or the leucine incorporation technique. These data indicate that small bacteria, although more numerous than larger ones, not only constitute a smaller proportion of the soil bacterial biomass than larger bacteria, but also contribute to a lesser degree to carbon transformations in soil.
journal_name
Microb Ecoljournal_title
Microbial ecologyauthors
Bååth Edoi
10.1007/BF00182410subject
Has Abstractpub_date
1994-05-01 00:00:00pages
267-78issue
3eissn
0095-3628issn
1432-184Xjournal_volume
27pub_type
杂志文章abstract::Simulation modeling has been an integral, albeit ad hoc, component of the field of aquatic microbial ecology for the past two decades. One of the most critical steps in simulation modeling is the initial formulation of a clear set of questions and goals. It is doubtful that a single generic model could be constructed ...
journal_title:Microbial ecology
pub_type: 杂志文章
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更新日期:1994-09-01 00:00:00
abstract::While oyster mushroom (Pleurotus spp.) is one of the most popular cultivated edible mushrooms, there is scanty information about the microbial community taking part in mushroom substrate production. In this study, an improved sequence-aided terminal restriction fragment length polymorphism (T-RFLP) was used to identif...
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journal_title:Microbial ecology
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journal_title:Microbial ecology
pub_type: 杂志文章
doi:10.1007/s00248-006-9144-7
更新日期:2007-01-01 00:00:00
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journal_title:Microbial ecology
pub_type: 杂志文章
doi:10.1007/BF02010599
更新日期:1985-09-01 00:00:00
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journal_title:Microbial ecology
pub_type: 杂志文章
doi:10.1007/s00248-019-01471-y
更新日期:2020-07-01 00:00:00
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journal_title:Microbial ecology
pub_type: 杂志文章
doi:10.1007/s00248-020-01527-4
更新日期:2020-10-01 00:00:00
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journal_title:Microbial ecology
pub_type: 杂志文章
doi:10.1007/BF02020340
更新日期:1980-12-01 00:00:00
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journal_title:Microbial ecology
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doi:10.1007/s00248-002-2023-y
更新日期:2003-01-01 00:00:00
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更新日期:2004-10-01 00:00:00
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journal_title:Microbial ecology
pub_type: 杂志文章
doi:10.1007/s00248-014-0419-0
更新日期:2014-10-01 00:00:00
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pub_type: 杂志文章,meta分析
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更新日期:2018-02-01 00:00:00
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更新日期:2012-02-01 00:00:00
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journal_title:Microbial ecology
pub_type: 杂志文章
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更新日期:1981-12-01 00:00:00
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pub_type: 杂志文章,评审
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更新日期:2013-07-01 00:00:00
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journal_title:Microbial ecology
pub_type: 杂志文章
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更新日期:2008-05-01 00:00:00
abstract::Saltmarshes are typically dominated by perennial grasses with large underground rhizome systems that can change local sediment conditions and be important in shaping the sediment microbial community. Factors such as salinity that control plant zonation in saltmarshes are also likely to influence the microbial communit...
journal_title:Microbial ecology
pub_type: 杂志文章
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更新日期:2016-02-01 00:00:00
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journal_title:Microbial ecology
pub_type: 杂志文章
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更新日期:2009-05-01 00:00:00
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journal_title:Microbial ecology
pub_type: 杂志文章
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更新日期:2019-11-01 00:00:00
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journal_title:Microbial ecology
pub_type: 杂志文章
doi:10.1007/s00248-019-01434-3
更新日期:2020-04-01 00:00:00
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journal_title:Microbial ecology
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更新日期:2012-04-01 00:00:00
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journal_title:Microbial ecology
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更新日期:2012-10-01 00:00:00
abstract::The ecological importance of microbial symbioses in terrestrial soils is widely recognized, but their role in soils that accumulate in forest canopies is almost entirely unknown. To address this gap, this study investigated the Frankia-Alnus rubra symbiosis in canopy and forest floor roots at Olympic National Park, WA...
journal_title:Microbial ecology
pub_type: 杂志文章
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更新日期:2010-02-01 00:00:00