Abstract:
:Numbers of viable bacteria as indicated by colony-forming units (CFU), microbial adenosine triphosphate levels, dissolved organic carbon (DOC), particulate organic carbon and nitrogen (POC and PON), glucose concentration, heterotrophic potential (Vmax), and in situ heterotrophic activity (Vn) of near-surface microlayer samples (70-80 mum depth), the neuston, and bulk column water samples (0.2-1.5 m depth), the plankton, of several natural waters were compared. DOC and glucose concentration values of near-surface and bulk water were similar, whereas POC and PON values of the near-surface were normally one order of magnitude greater than those of bulk water. Viable counts were generally greater in the neuston, but ATP levels were greater in the plankton. Comparative values of total heterotrophic potentials and heterotrophic activities fluctuated greatly. Heterotrophic potential per CFU of the neuston was 33% of that of the plankton; neuston heterotrophic activity per CFU was 10% of that of the plankton. These data suggest that neustonic heterotrophic bacteria are not as metabolically active as their planktonic counterparts and that they are under greater stress at the near-surface than in the column water.
journal_name
Can J Microbioljournal_title
Canadian journal of microbiologyauthors
Dietz AS,Albright LJ,Tuominen Tdoi
10.1139/m76-251subject
Has Abstractpub_date
1976-12-01 00:00:00pages
1699-709issue
12eissn
0008-4166issn
1480-3275journal_volume
22pub_type
杂志文章abstract::The origin of the eukaryotic nucleus is difficult to reconstruct. While eukaryotic organelles (chloroplast, mitochondrion) are eubacterial endosymbionts, the source of nuclear genes has been obscured by multiple nucleotide substitutions. Using evolutionary parsimony, a newly developed rate-invariant treeing algorithm,...
journal_title:Canadian journal of microbiology
pub_type: 杂志文章
doi:10.1139/m89-017
更新日期:1989-01-01 00:00:00
abstract::The rapid onset of resistance reduces the efficacy of most conventional antimicrobial drugs and is a general cause of concern for human well-being. Thus, there is great demand for a continuous supply of novel antibiotics to combat this problem. Bacteria-derived antimicrobial peptides (AMPs) have long been used as food...
journal_title:Canadian journal of microbiology
pub_type: 杂志文章,评审
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abstract::No clear data are available on how flavonoids from different chemical groups affect root colonization by arbuscular mycorrhizal fungi (AMF) and whether flavonoids affecting the presymbiotic growth of AMF also affect root colonization by AMF. In the present work, we compared the effect of flavones (chrysin and luteolin...
journal_title:Canadian journal of microbiology
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更新日期:2007-06-01 00:00:00
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journal_title:Canadian journal of microbiology
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abstract::An endo-beta-1,4-xylanase gene was cloned from Neocallimastix patriciarum 27 in the bacteriophage vector lambda gtWES lambda B and was subcloned into the plasmid vectors pUC18 and pUC19 in which xylanase activity was expressed in both orientations. The xylanase was located in the periplasmic space of the host, Escheri...
journal_title:Canadian journal of microbiology
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更新日期:1993-01-01 00:00:00
abstract::Habitat fragmentation affects the biodiversity and function of aboveground organisms in natural ecosystems but has not been studied for effects on belowground species. In this paper, we consider the diversity of the rhizobia associated with the indigenous legume Dalea purpurea in 3 residual prairie areas in Minnesota ...
journal_title:Canadian journal of microbiology
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更新日期:2005-01-01 00:00:00
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journal_title:Canadian journal of microbiology
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更新日期:1996-03-01 00:00:00
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journal_title:Canadian journal of microbiology
pub_type: 杂志文章
doi:10.1139/cjm-2015-0811
更新日期:2016-06-01 00:00:00
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journal_title:Canadian journal of microbiology
pub_type: 杂志文章
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更新日期:1988-03-01 00:00:00
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journal_title:Canadian journal of microbiology
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更新日期:1980-02-01 00:00:00
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journal_title:Canadian journal of microbiology
pub_type: 杂志文章
doi:10.1139/m84-234
更新日期:1984-12-01 00:00:00
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journal_title:Canadian journal of microbiology
pub_type: 杂志文章
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更新日期:2007-08-01 00:00:00
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journal_title:Canadian journal of microbiology
pub_type: 杂志文章
doi:10.1139/m79-046
更新日期:1979-03-01 00:00:00
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journal_title:Canadian journal of microbiology
pub_type: 杂志文章
doi:10.1139/m80-219
更新日期:1980-11-01 00:00:00
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journal_title:Canadian journal of microbiology
pub_type: 杂志文章
doi:10.1139/m91-112
更新日期:1991-09-01 00:00:00
abstract::Most prokaryotic chromosomes contain a number of toxin-antitoxin (TA) modules consisting of a pair of genes that encode 2 components, a stable toxin and its cognate labile antitoxin. TA systems are also known as addiction modules, since the cells become "addicted" to the short-lived antitoxin product (the unstable ant...
journal_title:Canadian journal of microbiology
pub_type: 杂志文章,评审
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更新日期:2012-05-01 00:00:00
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journal_title:Canadian journal of microbiology
pub_type: 杂志文章
doi:10.1139/m96-111
更新日期:1996-08-01 00:00:00
abstract::The antibacterial mechanism of a Cinnamomum cassia essential oil from Vietnam and of its main component (trans-cinnamaldehyde, 90% (m/m) of C. cassia essential oil) against a Listeria innocua strain was investigated to estimate their potential for food preservation. In the presence of C. cassia essential oil or trans-...
journal_title:Canadian journal of microbiology
pub_type: 杂志文章
doi:10.1139/cjm-2014-0481
更新日期:2015-04-01 00:00:00
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journal_title:Canadian journal of microbiology
pub_type: 杂志文章
doi:10.1139/m92-008
更新日期:1992-01-01 00:00:00
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journal_title:Canadian journal of microbiology
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更新日期:2004-05-01 00:00:00
abstract::Ten bacterial strains were isolated by enrichment culture, using as carbon sources either aliphatics or an aromatic-polar mixture. Oxygen uptake rate was used as a criterion to determine culture transfer timing at each enrichment stage. Biodegradation of aliphatics (10,000 mg L(-1)) and an aromatic-polar mixture (5000...
journal_title:Canadian journal of microbiology
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journal_title:Canadian journal of microbiology
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journal_title:Canadian journal of microbiology
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journal_title:Canadian journal of microbiology
pub_type: 杂志文章
doi:10.1139/m94-016
更新日期:1994-02-01 00:00:00
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journal_title:Canadian journal of microbiology
pub_type: 杂志文章
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abstract::Guanidine-resistant (gr) mutants of poliovirus were previously categorized into four groups by electrophoretic properties and peptide maps of nonstructural virus protein 2C. Growth of mutants in the presence of guanidine depends upon temperature of incubation. The four groups of gr variants respond differently to temp...
journal_title:Canadian journal of microbiology
pub_type: 杂志文章
doi:10.1139/m85-220
更新日期:1985-12-01 00:00:00
abstract::Penicillium chrysogenum F1 is very efficient in bioleaching heavy metals from the soil and is used for that purpose. We found that F1 can extract 19.8 mg Cd, Cu, Pb, and Zn from 2.5 g soil; the total heavy metals' bioleaching ratio was 60.4%. In this study, the bioleaching mechanism was investigated by means of metabo...
journal_title:Canadian journal of microbiology
pub_type: 杂志文章
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journal_title:Canadian journal of microbiology
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更新日期:1993-04-01 00:00:00
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journal_title:Canadian journal of microbiology
pub_type: 杂志文章
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