Abstract:
:The recalcitrance of xenobiotics may be caused by an absence of transforming enzymes or by their inability to enter microbial cells. A nondestructive method for differentiating between these two possibilities is described. The solid n-alkanes octadecane (C(18)) and hexatriacontane (C(36)) were encapsulated into phosphatidylcholine bilayers (liposomes). The uptake and metabolism rates of encapsulated and unencapsulated substrates were then compared. During 1 h at 25 degrees C, a Pseudomonas isolate took up 1.3% of radiolabeled and unencapsulated C(18) (solid state) versus 23.5% of labeled and encapsulated C(18). Growth at 25 degrees C occurred with an apparent k(s) of 2453 +/- 148 mg/liter. Liposome encapsulation decreased this K(s) to 60 +/- 12 mg/liter. At 34 degrees C, growth on C(18) (liquid state) occurred with an apparent K(s) of 819 +/- 83 mg/liter and on the readily available carbon source succinate, K(s) values were 80 +/- 10 and 13 +/- 7 mg/liter at 25 and 34 degrees C, respectively. At 25 degrees C, the isolate grew on C(36) with an apparent K(s) of 2,698 +/- 831 mg/liter. Liposome encapsulation decreased the K(s) more than 60-fold to 41 +/- 7 mg/liter, resulting in the complete utilization of 400 mg of C(36) per liter in 16 h. Since controls excluded the metabolic utilization of phosphatidylcholine, the results clearly identify transport limitation as the cause for C(36) recalcitrance.
journal_name
Appl Environ Microbioljournal_title
Applied and environmental microbiologyauthors
Miller RM,Bartha Rdoi
10.1128/AEM.55.2.269-274.1989keywords:
subject
Has Abstractpub_date
1989-02-01 00:00:00pages
269-74issue
2eissn
0099-2240issn
1098-5336journal_volume
55pub_type
杂志文章abstract::The Tinto River (Huelva, southwestern Spain) is an extreme environment with a rather constant acidic pH along the entire river and a high concentration of heavy metals. The extreme conditions of the Tinto ecosystem are generated by the metabolic activity of chemolithotrophic microorganisms thriving in the rich complex...
journal_title:Applied and environmental microbiology
pub_type: 杂志文章
doi:10.1128/aem.69.8.4853-4865.2003
更新日期:2003-08-01 00:00:00
abstract::A number of Micromonospora strains isolated from the water column, sediment, and cellulose baits placed in freshwater lakes were shown to be able to degrade cellulose in lake water without any addition of nutrients. A selective isolation method was also developed to demonstrate that CFU arose from both spores and hyph...
journal_title:Applied and environmental microbiology
pub_type: 杂志文章
doi:10.1128/AEM.01092-08
更新日期:2008-11-01 00:00:00
abstract::The aim of this study was to compare the antagonistic properties of Lactobacillus casei GG exerted in vitro against Salmonella typhimurium C5 in a cellular model, cultured enterocyte-like Caco-2 cells, to those exerted in vivo in an animal model, C3H/He/Oujco mice. Our results show that a 1-h contact between the invad...
journal_title:Applied and environmental microbiology
pub_type: 杂志文章
doi:10.1128/AEM.63.2.513-518.1997
更新日期:1997-02-01 00:00:00
abstract::Three common food pathogenic microorganisms were exposed to treatments simulating those used in food processing. Treated cell suspensions were then analyzed for reduction in growth by plate counting. Flow cytometry (FCM) and fluorescence-activated cell sorting (FACS) were carried out on treated cells stained for membr...
journal_title:Applied and environmental microbiology
pub_type: 杂志文章
doi:10.1128/AEM.00323-11
更新日期:2011-07-01 00:00:00
abstract::Taxonomic and phylogenetic fingerprinting based on sequence analysis of gene fragments from the large-subunit rRNA (LSU) gene or the internal transcribed spacer (ITS) region is becoming an integral part of fungal classification. The lack of an accurate and robust classification tool trained by a validated sequence dat...
journal_title:Applied and environmental microbiology
pub_type: 杂志文章
doi:10.1128/AEM.06826-11
更新日期:2012-03-01 00:00:00
abstract::ADP-glucose pyrophosphorylase (AGPase) and glycogen synthase (GS) catalyze the first two reactions of glycogen synthesis in cyanobacteria. Mutants defective in each of these enzymes in Synechococcus elongatus PCC 7942 were constructed and characterized. Activities of the corresponding enzymes in the selected mutants w...
journal_title:Applied and environmental microbiology
pub_type: 杂志文章
doi:10.1128/AEM.00397-08
更新日期:2010-05-01 00:00:00
abstract::The phosphotransferase system regulation domain (PRD)-containing activator, ManR, is required for glucose-controlled transcription of the mannose permease two (mpt) operon in Listeria innocua. His-871 in ManR PRD-II is needed for mpt repression in glucose-free media. His-506 in PRD-I is needed for mpt induction by glu...
journal_title:Applied and environmental microbiology
pub_type: 杂志文章
doi:10.1128/AEM.00052-07
更新日期:2007-09-01 00:00:00
abstract::A soil-inhabiting Fusarium proliferatum strain was capable of transforming or degrading nonlabeled and (sup14)C-labeled industrial, natural, and synthetic lignin. The mineralization rate per day (expressed as the percentage of added radioactivity recovered as to (sup14)CO(inf2)) was maximal during primary metabolism. ...
journal_title:Applied and environmental microbiology
pub_type: 杂志文章
doi:10.1128/AEM.63.9.3716-3718.1997
更新日期:1997-09-01 00:00:00
abstract::The beta-xylosidase-encoding xlnD gene of Aspergillus niger 90196 was amplified by the PCR technique from first-strand cDNA synthesized on mRNA isolated from the fungus. The nucleotide sequence of the cDNA fragment was verified to contain a 2,412-bp open reading frame that encodes a 804-amino-acid propeptide. The 778-...
journal_title:Applied and environmental microbiology
pub_type: 杂志文章
doi:10.1128/AEM.67.12.5512-5519.2001
更新日期:2001-12-01 00:00:00
abstract::Malonyl coenzyme A (malonyl-CoA) and methylmalonyl-CoA are the most common extender units for the biosynthesis of fatty acids and polyketides in Streptomyces, an industrially important producer of polyketides. Carboxylation of acetyl- and propionyl-CoAs is an essential source of malonyl- and methylmalonyl-CoAs; theref...
journal_title:Applied and environmental microbiology
pub_type: 杂志文章
doi:10.1128/AEM.00508-20
更新日期:2020-06-02 00:00:00
abstract::Microbial reductive dechlorination of [1,2-14C]trichloroethene to [14C]cis-dichloroethene and [14C]vinyl chloride was observed at 4 degrees C in anoxic microcosms prepared with cold temperature-adapted aquifer and river sediments from Alaska. Microbial anaerobic oxidation of [1,2-14C]cis-dichloroethene and [1,2-14C]vi...
journal_title:Applied and environmental microbiology
pub_type: 杂志文章
doi:10.1128/AEM.71.10.6414-6417.2005
更新日期:2005-10-01 00:00:00
abstract::Juvenile oyster disease (JOD) causes significant annual mortalities of hatchery-produced Eastern oysters, Crassostrea virginica, cultured in the Northeast. We have reported that a novel species of the alpha-proteobacteria Roseobacter group (designated CVSP) was numerically dominant in JOD-affected animals sampled duri...
journal_title:Applied and environmental microbiology
pub_type: 杂志文章
doi:10.1128/aem.66.9.3924-3930.2000
更新日期:2000-09-01 00:00:00
abstract::Smectite clay minerals are abundant in soils and sediments worldwide and are typically rich in Fe. While recent investigations have shown that the structural Fe(III) bound in clay minerals is reduced by microorganisms, previous studies have not tested growth with clay minerals as the sole electron acceptor. Here we ha...
journal_title:Applied and environmental microbiology
pub_type: 杂志文章
doi:10.1128/aem.68.12.6256-6262.2002
更新日期:2002-12-01 00:00:00
abstract::Butane-oxidizing Arthrobacter (ATCC 27778) bacteria were shown to degrade low concentrations of methyl t-butyl ether (MTBE; range, 100 to 800 microg/liter) with an apparent half-saturation concentration (K(s)) of 2.14 mg/liter and a maximum substrate utilization rate (k(c)) of 0.43 mg/mg of total suspended solids per ...
journal_title:Applied and environmental microbiology
pub_type: 杂志文章
doi:10.1128/AEM.67.5.2197-2201.2001
更新日期:2001-05-01 00:00:00
abstract::Noroviruses from mussels collected near sewage effluents were compared with local patient outbreak strains. Sequence analyses of RNA polymerase-capsid-poly(A)-3' (3.1-kilobase) regions confirmed the 99.9% similarity between genotype I.1 strains from mussels and patient strains from recreational-bathing outbreaks, indi...
journal_title:Applied and environmental microbiology
pub_type: 杂志文章
doi:10.1128/AEM.02477-07
更新日期:2008-04-01 00:00:00
abstract::The accurate description of a microbial community is an important first step in understanding the roles of its components in ecosystem function. A method for surveying microbial communities termed serial analysis of rRNA genes (SARD) is described here. Through a series of molecular cloning steps, short DNA sequence ta...
journal_title:Applied and environmental microbiology
pub_type: 杂志文章
doi:10.1128/AEM.02956-06
更新日期:2007-07-01 00:00:00
abstract::Unspecific peroxygenases (UPOs) constitute a new family of fungal heme-thiolate enzymes in which there is high biotechnological interest. Although several thousand genes encoding hypothetical UPO-type proteins have been identified in sequenced fungal genomes and other databases, only a few UPO enzymes have been experi...
journal_title:Applied and environmental microbiology
pub_type: 杂志文章
doi:10.1128/AEM.02899-19
更新日期:2020-03-18 00:00:00
abstract::Recombinant strains of Pseudomonas putida KT2440 carrying genetic expression cassettes with xylene oxygenase- and styrene monooxygenase-encoding genes on their chromosomes could be induced in shaking-flask experiments to specific activities that rivaled those of multicopy-plasmid-based Escherichia coli recombinants. S...
journal_title:Applied and environmental microbiology
pub_type: 杂志文章
doi:10.1128/AEM.65.12.5619-5623.1999
更新日期:1999-12-01 00:00:00
abstract::Recently, the lignin-degrading basidiomycete Pleurotus ostreatus has become a widely used model organism for fungal genomic and transcriptomic analyses. The increasing interest in this species has led to an increasing number of studies analyzing the transcriptional regulation of multigene families that encode extracel...
journal_title:Applied and environmental microbiology
pub_type: 杂志文章
doi:10.1128/AEM.00402-15
更新日期:2015-06-15 00:00:00
abstract::Allozyme electrophoresis and restriction fragment length polymorphism (RFLP) analyses were used to examine the genetic diversity of a collection of 18 Rhizobium leguminosarum bv. trifolii, 1 R. leguminosarum bv. viciae, and 2 R. meliloti strains. Allozyme analysis at 28 loci revealed 16 electrophoretic types. The mean...
journal_title:Applied and environmental microbiology
pub_type: 杂志文章
doi:10.1128/AEM.57.12.3489-3495.1991
更新日期:1991-12-01 00:00:00
abstract::It has previously been shown that the tomato pathogen Clavibacter michiganensis subsp. michiganensis secretes a 14-kDa protein, C. michiganensis subsp. michiganensis AMP-I (CmmAMP-I), that inhibits growth of Clavibacter michiganensis subsp. sepedonicus, the causal agent of bacterial ring rot of potato. Using sequences...
journal_title:Applied and environmental microbiology
pub_type: 杂志文章
doi:10.1128/AEM.01065-13
更新日期:2013-09-01 00:00:00
abstract::A thorough understanding of the microorganisms and pathogens associated with the larval stage of the tropical ornate rock lobster, Panulirus ornatus, is required to overcome disease outbreaks that currently block aquaculture attempts. This study used microscopy in addition to culture and molecularly based microbiologi...
journal_title:Applied and environmental microbiology
pub_type: 杂志文章
doi:10.1128/AEM.02520-06
更新日期:2007-03-01 00:00:00
abstract::A total of 286 isolates of Pseudomonas maltophilia was collected from sheep exhibiting brown or yellowish fleece rot and from fly-strike lesions. Enzyme activities for 10 of the isolates were examined by plate tests and with the API ZYM system and compared with the enzymatic profile of a human type strain of P. maltop...
journal_title:Applied and environmental microbiology
pub_type: 杂志文章
doi:10.1128/AEM.51.2.346-348.1986
更新日期:1986-02-01 00:00:00
abstract::The metabolic conversion of 5-methylfurfural and 2-methylfurfural to furfural by a methanogenic bacterium, Methanococcus sp. strain B, was studied. This bacterium was found to use methylfurfural compounds as a growth substrate and to convert them stoichiometrically to furfural. For every mole of methylfurfurals metabo...
journal_title:Applied and environmental microbiology
pub_type: 杂志文章
doi:10.1128/AEM.62.9.3483-3485.1996
更新日期:1996-09-01 00:00:00
abstract::Acute gastroenteritis caused by human norovirus is a significant public health issue. Fresh produce and seafood are examples of high-risk foods associated with norovirus outbreaks. Food contact surfaces also have the potential to harbor noroviruses if exposed to fecal contamination, aerosolized vomitus, or infected fo...
journal_title:Applied and environmental microbiology
pub_type: 杂志文章
doi:10.1128/AEM.02489-15
更新日期:2015-10-16 00:00:00
abstract::Aeromonas sp. will methylate trimethyl lead acetate (Me3PbOAc) to volatile tetramethyl lead (Me4Pb). Examination of cultures grown in the presence of Me3PbOAc revealed no major irregularities between cells of the treated and untreated cultures. Some cells, however, showed evidence that intracytoplasmic materials had b...
journal_title:Applied and environmental microbiology
pub_type: 杂志文章
doi:10.1128/AEM.32.5.723-725.1976
更新日期:1976-11-01 00:00:00
abstract::Infectious hematopoietic necrosis virus (IHNV) is a pathogen of young salmon and trout. Viral epizootics among these fish in private and public rearing facilities have been a problem in the northwestern United States from California to Alaska, and an IHNV vaccine has been sought by the aquaculture experts. Since an IH...
journal_title:Applied and environmental microbiology
pub_type: 杂志文章
doi:10.1128/AEM.57.5.1372-1378.1991
更新日期:1991-05-01 00:00:00
abstract::Norwalk virus and other human caliciviruses (noroviruses) are major agents of gastroenteritis, and water is a major route of their transmission. In an effort to control Norwalk virus in drinking water, Norwalk virus reduction by bench-scale ozone disinfection was determined using quantitative reverse transcription (RT...
journal_title:Applied and environmental microbiology
pub_type: 杂志文章
doi:10.1128/aem.69.7.3975-3978.2003
更新日期:2003-07-01 00:00:00
abstract::Rsan-ver, a strain of Pseudomonas aeruginosa isolated at this department, was used for the development of a continuous process for biosurfactant production. The active compounds were identified as rhamnolipids. A final medium for production was designed in continuous culture by means of medium shifts, since the format...
journal_title:Applied and environmental microbiology
pub_type: 杂志文章
doi:10.1128/AEM.48.2.301-305.1984
更新日期:1984-08-01 00:00:00
abstract::Salmonella enterica contamination in foods is a significant concern for public health. When DNA detection methods are used for analysis of foods, one of the major concerns is false-positive results from the detection of dead cells. To circumvent this crucial issue, a TaqMan quantitative real-time RT-PCR (qRT-PCR) assa...
journal_title:Applied and environmental microbiology
pub_type: 杂志文章
doi:10.1128/AEM.02686-08
更新日期:2009-06-01 00:00:00