Abstract:
:Ammonia-induced injury was investigated in pure cultures of Escherichia coli and Enterobacter aerogenes, and in natural coliform populations obtained from the oligotrophic Luxapallila and the eutrophic Sunflower Rivers in northern Mississippi. Pure cultures were affected by ammonia exposure as indicated by changes in the injury ratio (IR) of CFU on m-T7 agar/CFU on m-Endo agar. Ammonia concentrations between 0 and 20 (mg NH3-N/1) had little or no effect and concentrations between 40 and 80 caused the greatest injury. Natural coliform populations from the oligotrophic river were more prone to ammonia-induced injury than those from the eutrophic river. The results stress the need for the routine use of m-T7 media and the enumeration of injured cells when using the membrane filter procedure to ascertain domestic water quality.
journal_name
FEMS Microbiol Lettjournal_title
FEMS microbiology lettersauthors
Naundorf G,Aumen NGdoi
10.1016/0378-1097(89)90367-4subject
Has Abstractpub_date
1989-11-01 00:00:00pages
65-9issue
1-2eissn
0378-1097issn
1574-6968journal_volume
53pub_type
杂志文章abstract::Digital game-based learning (DGBL) is being used increasingly as an alternative learning tool to teach science in further and higher education. A variety of digital game formats currently exist for science learning, alongside diverse methods for their implementation and evaluation. This paper aims to provide a broad s...
journal_title:FEMS microbiology letters
pub_type: 杂志文章,评审
doi:10.1093/femsle/fny237
更新日期:2018-11-01 00:00:00
abstract::Bacteriophages infecting Salmonella spp. were isolated from sewage using soft agar overlays containing three Salmonella serovars and assessed with regard to their potential to control food-borne salmonellae. Two distinct phages, as defined by plaque morphology, structure and host range, were obtained from a single sam...
journal_title:FEMS microbiology letters
pub_type: 杂志文章
doi:10.1111/j.1574-6968.2006.00217.x
更新日期:2006-05-01 00:00:00
abstract::Myxococcus xanthus cells move over surfaces by gliding motility. The frz signal transduction system is used to control the reversal frequency, and thus the overall direction of movement of M. xanthus cells. We analyzed the behavior of wild-type and frz mutant cells in response to prey bacteria (Escherichia coli). Wild...
journal_title:FEMS microbiology letters
pub_type: 杂志文章
doi:10.1111/j.1574-6968.1996.tb08110.x
更新日期:1996-04-01 00:00:00
abstract::Four distinct bands of cysteine proteinase activity were detected when stationary-phase populations of Leishmania mexicana mexicana were subjected to gelatin-SDS-PAGE. The highest mobility band contained at least three isoforms separable by mono Q anion exchange chromatography. These high mobility activities were dist...
journal_title:FEMS microbiology letters
pub_type: 杂志文章
doi:10.1111/j.1574-6968.1992.tb05301.x
更新日期:1992-07-01 00:00:00
abstract::Saccharomyces cerevisiae genes encoding functions necessary for inhibition by the Pseudomonas syringae pv. syringae cyclic lipodepsipeptide, syringomycin-E, were identified by mutant analyses. Syringomycin-E-resistant mutants were isolated, shown to contain single recessive mutations, and divided into eight gene compl...
journal_title:FEMS microbiology letters
pub_type: 杂志文章
doi:10.1111/j.1574-6968.1993.tb06595.x
更新日期:1993-12-15 00:00:00
abstract::Molecular studies of the rumen bacterium Ruminococcus flavefaciens are constrained by the lack of stable gene transfer systems. We report here on the characterization of RflFII, a restriction endonuclease isolated from R. flavefaciens FD-1. The enzyme is an isoschizomer of ScaI, and cleavage of the DNA is blunt-ended,...
journal_title:FEMS microbiology letters
pub_type: 杂志文章
doi:10.1111/j.1574-6968.1994.tb07162.x
更新日期:1994-09-15 00:00:00
abstract::Five independent collections, comprising a total of 34 clones encoding cellulases, hemicellulases and cell surface proteins of Clostridium thermocellum, were searched for overlapping or contiguous DNA fragments. The clones were hybridized to large genomic restriction fragments separated by pulse-field electrophoresis....
journal_title:FEMS microbiology letters
pub_type: 杂志文章
doi:10.1111/j.1574-6968.1998.tb12950.x
更新日期:1998-04-01 00:00:00
abstract::Two conservative gene clusters, the S10 ribosomal protein region and one (of the two) set of rRNA genes, were split in a genome crossover rearrangement event in Mycoplasma gallisepticum. As a result of the rearrangement the major part of the S10 ribosomal protein cluster is located upstream of genes for 23S-5S rRNA (r...
journal_title:FEMS microbiology letters
pub_type: 杂志文章
doi:10.1111/j.1574-6968.2002.tb11095.x
更新日期:2002-03-05 00:00:00
abstract::An enzyme linked immune sorbent assay (ELISA) was developed to measure bacterial surface lipoteichoic acid (LTA). Numerous strains of oral streptococci belonging to the 'viridans' group were examined on three separate occasions. The results show that, under these cultural conditions, oral streptococci do not normally ...
journal_title:FEMS microbiology letters
pub_type: 杂志文章
doi:10.1016/0378-1097(89)90045-1
更新日期:1989-04-01 00:00:00
abstract::A broad distribution of the lactococcal IS elements ISS1 [1] and IS904 [2] in several lactococcal plasmids and chromosomal DNA was observed. Hybridization of the ISS1 and IS904 oligonucleotide gene probes with DNA of lactococcal phages showed that none of these tested bacteriophages contained one of the IS elements. O...
journal_title:FEMS microbiology letters
pub_type: 杂志文章
doi:10.1111/j.1574-6968.1991.tb04681.x
更新日期:1991-05-15 00:00:00
abstract::Three strains of Streptococcus uberis isolated from dairy cows with mastitis were co-cultured with a bovine mammary epithelial cell line (MAC-T) in Dulbecco's modified Eagle's medium without fetal bovine serum. Protein profiles from culture supernatants and bacterial pellets among different treatments were compared by...
journal_title:FEMS microbiology letters
pub_type: 杂志文章
doi:10.1111/j.1574-6968.1998.tb13896.x
更新日期:1998-09-15 00:00:00
abstract::Endophytic fungi from Paeonia lactiflora Pallas, which is mainly distributed in China, were characterized and screened to identify those capable of producing paeoniflorin. A total of 101 isolates obtained from the roots, stems and leaves of P. lactiflora were grouped into 16 fungal taxa based on morphological traits a...
journal_title:FEMS microbiology letters
pub_type: 杂志文章
doi:10.1093/femsle/fny263
更新日期:2018-12-01 00:00:00
abstract::The RS1 element associated with Vibrio cholerae CTX phi prophage was cloned from an E1 Tor biotype Vibrio cholerae strain. We used the recA- vaccine strain Peru-15, that lacks the target for RS-mediated site-specific integration, to show that RS1 promotes autonomous replication of a suicide vector. A linker insertion ...
journal_title:FEMS microbiology letters
pub_type: 杂志文章
doi:10.1111/j.1574-6968.1998.tb13079.x
更新日期:1998-07-01 00:00:00
abstract::Bacteriophages co-exist and co-evolve with their hosts in natural environments. Virulent phages lyse infected cells through lytic cycles, whereas temperate phages often remain dormant and can undergo lysogenic or lytic cycles. In their lysogenic state, prophages are actually part of the host genome and replicate passi...
journal_title:FEMS microbiology letters
pub_type: 杂志文章,评审
doi:10.1093/femsle/fnu022
更新日期:2015-01-01 00:00:00
abstract::The lin genes encode the gamma-hexachlorocyclohexane (gamma-HCH or lindane) catabolic pathway in lindane-degrading strains. The location and stability of these genes have been explored in the lindane-degrading Sphingobium francense strain Sp+, and in two non-lindane-degrading mutants (Sp1- and Sp2-). The lin genes, li...
journal_title:FEMS microbiology letters
pub_type: 杂志文章
doi:10.1111/j.1574-6968.2006.00188.x
更新日期:2006-04-01 00:00:00
abstract::Helicobacter pylori possesses a gene (HP0326/JHP309) homologous to neuA of other bacteria, encoding a cytidyl monophosphate-N-acetylneuraminic acid synthetase-homologous enzyme in its N-terminal portion. We analysed the function of this gene, which is controlled by a flagellar class 2 sigma(54) promoter, in flagellar ...
journal_title:FEMS microbiology letters
pub_type: 杂志文章
doi:10.1111/j.1574-6968.2002.tb11176.x
更新日期:2002-05-07 00:00:00
abstract::The filamentous fungi Monascus spp., which have been used in traditional fermented food in Asia for centuries, are well-known producers of a group of bioactive metabolites that are widely used as food additives and nutraceutical supplements worldwide. However, its potential to produce the mycotoxin citrinin poses a th...
journal_title:FEMS microbiology letters
pub_type: 杂志文章
doi:10.1111/j.1574-6968.2010.01992.x
更新日期:2010-07-01 00:00:00
abstract::Conditional gene expression systems are useful tools for studying the role of essential or toxic gene products in bacterial systems. There is a paucity of such systems available for use in the mycobacteria. The utility of the Escherichia coli arabinose-inducible system was looked into, since it is tightly controlled i...
journal_title:FEMS microbiology letters
pub_type: 杂志文章
doi:10.1111/j.1574-6968.2007.00842.x
更新日期:2007-09-01 00:00:00
abstract::A family of 2,3-di-O-acyl trehaloses (DAT), previously identified in Mycobacterium fortuitum, was studied by fast-atom bombardment mass spectrometry to establish the combinations of fatty acyl substituents and, hence, to delineate the molecular species there comprised. The mass spectra indicated the possible existence...
journal_title:FEMS microbiology letters
pub_type: 杂志文章
doi:10.1111/j.1574-6968.1994.tb06901.x
更新日期:1994-06-15 00:00:00
abstract::Lyme disease is a multisystemic disorder caused by Borrelia burgdorferi, an invasive spirochete. B. burgdorferi has a predilection for collagenous tissue and one major clinical manifestation of the disease is arthritis. We have identified a collagenolytic activity in B. burgdorferi detergent lysates using iodinated ge...
journal_title:FEMS microbiology letters
pub_type: 杂志文章
doi:10.1111/j.1574-6968.1996.tb08506.x
更新日期:1996-10-15 00:00:00
abstract::Microbial competition for carbon sources is a primary determinant of rhizosphere ecology. We employed the PCR to examine the population fluctuations of a symbiotic nitrogen-fixing bacterium (Rhizobium etli) during the first 11 days following inoculation of Phaseolus vulgaris seedlings grown in the presence or absence ...
journal_title:FEMS microbiology letters
pub_type: 杂志文章
doi:10.1111/j.1574-6968.1996.tb08442.x
更新日期:1996-09-01 00:00:00
abstract::In the present study, strains of 17 reference Acinetobacter genospecies were investigated by using the polymerase chain reaction (PCR). We used primers to amplify spacer regions between the 16S and 23S genes in the prokaryotic rRNA genetic loci. When the spacer amplification products were resolved by electrophoresis, ...
journal_title:FEMS microbiology letters
pub_type: 杂志文章
doi:10.1111/j.1574-6968.1995.tb07414.x
更新日期:1995-02-15 00:00:00
abstract::Acinetobacter baumannii strain A148, a clinical isolate resistant to imipenem (MIC = 32 mg l-1), synthesized two beta-lactamases with pIs 6.3 and > 9.2. The pI 6.3 enzyme hydrolyzed the penicillins, including isoxazoylpenicillins, first-, second- and, to a lesser extent, third-generation cephalosporins. It was inhibit...
journal_title:FEMS microbiology letters
pub_type: 杂志文章
doi:10.1111/j.1574-6968.1997.tb12593.x
更新日期:1997-08-15 00:00:00
abstract::Marine viruses are the most abundant biological entity in the oceans, the majority of which infect bacteria and are known as bacteriophages. Yet, the bulk of bacteriophages form part of the vast uncultured dark matter of the microbial biosphere. In spite of the paucity of cultured marine bacteriophages, it is known th...
journal_title:FEMS microbiology letters
pub_type: 杂志文章,评审
doi:10.1093/femsle/fnw158
更新日期:2016-08-01 00:00:00
abstract::A previous study [DeVault et al. (1991) Mol. Microbiol. 5, 2503-2509] suggested that growth of Pseudomonas aeruginosa in glucose-containing medium represses algD gene transcription. In this study, growth of P. aeruginosa in rich medium containing glucose or gluconate increased alginate production and algD transcriptio...
journal_title:FEMS microbiology letters
pub_type: 杂志文章
doi:10.1111/j.1574-6968.1997.tb10291.x
更新日期:1997-03-15 00:00:00
abstract::OMIZ-W68, a chemically defined medium that contains no long-chain fatty acids and yet supports in vitro proliferation of a wide range of fastidious oral anaerobes, is described. The type strains of Treponema denticola, Treponema lecithinolyticum, Treponema maltophilum, Treponema pectinovorum, Treponema socranskii, and...
journal_title:FEMS microbiology letters
pub_type: 杂志文章
doi:10.1111/j.1574-6968.2006.00609.x
更新日期:2007-04-01 00:00:00
abstract::Changes in gene expression play a critical role in enhancing the ability of cyanobacteria to survive under cold conditions. In the present study, Spirulina platensis cultures were grown at the optimal growth temperature, in the light, before being transferred to dark conditions at 22 degrees C. Two dimensional-differe...
journal_title:FEMS microbiology letters
pub_type: 杂志文章
doi:10.1111/j.1574-6968.2008.01100.x
更新日期:2008-04-01 00:00:00
abstract::Bananas contain large quantities of neurochemicals. Extracts from the peel and pulp of bananas in increasing stages of ripening were prepared and evaluated for their ability to modulate the growth of non-pathogenic and pathogenic bacteria. Extracts from the peel, and to a much lesser degree the pulp, increased the gro...
journal_title:FEMS microbiology letters
pub_type: 杂志文章
doi:10.1111/j.1574-6968.1997.tb12651.x
更新日期:1997-09-15 00:00:00
abstract::FlgM inhibits the flagella-specific sigma factor FliA and is involved in the mouse-virulence of Salmonella typhimurium. In recent experiments, we observed that: (i) a flgM gene that could function to negatively regulate flagella synthesis was present in a variety of salmonellae; and (ii) the flgM gene derived from Sal...
journal_title:FEMS microbiology letters
pub_type: 杂志文章
doi:10.1111/j.1574-6968.1996.tb08002.x
更新日期:1996-01-15 00:00:00
abstract::A novel Toxoplasma gondii interspersed repeat element (TgIRE), present in most of the tachyzoite chromosomes, was characterised. Two regions on the TgIRE sequence showed high identity to two different T. gondii expressed sequence tag cDNAs of unknown function, which seems to be TgIRE pseudogenes. Two set of primers we...
journal_title:FEMS microbiology letters
pub_type: 杂志文章
doi:10.1111/j.1574-6968.2000.tb08984.x
更新日期:2000-03-01 00:00:00