Abstract:
:RNA-based molecular technique (RT-qPCR) is a promising method for microcystin monitoring in lakes and reservoirs, but great lability of RNA in cyanobacterial samples limits its application. To date, no studies have investigated how to effectively preserve RNA in cyanobacterial samples. In this study, four different treatments (-80 °C freezer, -196 °C liquid nitrogen, 4 °C or 25 °C preservation after adding RNA protective fluid) were employed to preserve RNA in pure culture and field Microcystis samples, and RNA degradation in these treatments were systematically evaluated. Results showed liquid nitrogen was the most effective treatment to preserve RNA in pure culture and field Microcystis samples. RNA preservation using RNA protective fluid was temperature dependent. Low temperature (4 °C) could effectively slow down RNA degradation within a short time (1-7 d), since decay rate of mcyH mRNA (k = 0.00094 d-1) was much lower at 4 °C than that at 25 °C (0.0549 d-1) (P < 0.05). However, for field samples, RNA degradation was much faster than pure culture samples with the same treatment. Therefore, to better preserve RNA in field samples, a practical strategy for RNA preservation combining RNA protective fluid and liquid nitrogen, was proposed. Tests of field experiments showed it was more effective than individual treatment for RNA preservation in Microcystis samples during field sampling. Thus, this strategy could be employed to preserve RNA in cyanobacterial samples during field sampling, which will contribute to the application of RT-qPCR technique for microcystin monitoring in lakes and reservoirs.
journal_name
J Microbiol Methodsjournal_title
Journal of microbiological methodsauthors
Li X,Qiu D,Chen S,Li J,Luo C,Hu D,Li J,Zhu J,Chen H,Li S,Yu Xdoi
10.1016/j.mimet.2019.105684subject
Has Abstractpub_date
2019-09-01 00:00:00pages
105684eissn
0167-7012issn
1872-8359pii
S0167-7012(19)30289-1journal_volume
164pub_type
杂志文章abstract::Denaturing gradient gel electrophoresis (DGGE) of PCR-amplified ribosomal RNA gene amplicons was used to study the stool microbiota of hospitalized patients and to examine the effect of antibiotic therapy. For one patient, 16 anaerobic species identified by random cloning and sequencing of PCR-amplified rRNA genes fro...
journal_title:Journal of microbiological methods
pub_type: 杂志文章
doi:10.1016/s0167-7012(03)00059-9
更新日期:2003-08-01 00:00:00
abstract::Loop-mediated isothermal amplification (LAMP) is considered as one of the alternatives to the conventional PCR and it is an inexpensive portable diagnostic system with minimal power consumption. The present work describes the application of LAMP in real-time photon detection and quantitative analysis of nucleic acids ...
journal_title:Journal of microbiological methods
pub_type: 杂志文章
doi:10.1016/j.mimet.2016.12.002
更新日期:2017-02-01 00:00:00
abstract::We performed a comparison of four selected protocols from the literature using microtitre-plate and colorimetric biomass assay for evaluation of enterococci biofilm formation ability and optimized a protocol after the identification and stringent performance of biofilm formation steps. The optimized protocol uses a dy...
journal_title:Journal of microbiological methods
pub_type: 杂志文章
doi:10.1016/j.mimet.2010.11.007
更新日期:2011-02-01 00:00:00
abstract::Here we present the use of three fluorescent proteins in Staphylococcus aureus, Cerulean, PA-GFP, and mRFPmars. All molecules have an improved codon adaptation for expression in the A + T rich organisms and extend the fluorescent protein portfolio in staphylococcal research. ...
journal_title:Journal of microbiological methods
pub_type: 杂志文章
doi:10.1016/j.mimet.2010.07.022
更新日期:2010-10-01 00:00:00
abstract::Characterization of airborne bacterial cells requires efficient collection, concentration, and analysis techniques, particularly to overcome the challenge of their dilute nature in outdoor environments. This study aims to establish a rapid and reliable approach for quantification of bacteria in air samples. To do this...
journal_title:Journal of microbiological methods
pub_type: 杂志文章
doi:10.1016/j.mimet.2018.10.012
更新日期:2018-11-01 00:00:00
abstract::The reproducibility and reliability of quantitative microbiological assessments using the DNA-DNA hybridization "checkerboard method" (CKB) were assessed. The data originated from 180 chronic periodontitis patients, who were enrolled in a clinical trial and sampled at baseline, and 3 and 12m post-therapy. The samples ...
journal_title:Journal of microbiological methods
pub_type: 杂志文章
doi:10.1016/j.mimet.2015.01.010
更新日期:2015-03-01 00:00:00
abstract::One of the known limitations for biosensor assays is the high limit of detection for target cells within complex samples (e.g., Escherichia coli at 10(4) to 10(5) CFU/mL) due to poor capture efficiencies. Currently, researchers can only estimate the cell capture efficiency necessary to produce a positive signal for an...
journal_title:Journal of microbiological methods
pub_type: 杂志文章
doi:10.1016/j.mimet.2007.11.004
更新日期:2008-01-01 00:00:00
abstract::Staphylococcus aureus remains a leading, virulent pathogen capable of expressing complex drug resistance that requires up to 2-4 days for laboratory analysis. In this study, we evaluate the ability of automated microscopy of immobilized live bacterial cells to differentiate susceptible from non-susceptible responses o...
journal_title:Journal of microbiological methods
pub_type: 杂志文章
doi:10.1016/j.mimet.2013.12.021
更新日期:2014-03-01 00:00:00
abstract::Confocal Raman Microspectroscopy (CRM) can be used as a tool for the in situ evaluation of the chemical composition of living, fully submerged, unstained biofilms. In this study the estimation of the local water content in Pseudomonas aeruginosa PA01 biofilms is given as an example. The ratio of the area of the O-H st...
journal_title:Journal of microbiological methods
pub_type: 杂志文章
doi:10.1016/j.mimet.2008.05.012
更新日期:2008-09-01 00:00:00
abstract::The Baranyi and Roberts model is one of the most frequently used microbial growth models. It has been successfully applied to numerous studies of various microorganisms in different food products. Under dynamic conditions, the model is implicitly formulated as a set of two coupled differential equations which could be...
journal_title:Journal of microbiological methods
pub_type: 杂志文章
doi:10.1016/j.mimet.2015.03.003
更新日期:2015-05-01 00:00:00
abstract::Toxoplasmosis is caused by the protozoan parasite Toxoplasma gondii, which belongs to the phylum Apicomplexa. Since this parasite causes severe clinical symptoms in immunocompromised patients, early diagnosis of toxoplasmosis is essential. PCR is currently used for early diagnosis, but there is no consensus regarding ...
journal_title:Journal of microbiological methods
pub_type: 杂志文章
doi:10.1016/j.mimet.2017.08.001
更新日期:2017-10-01 00:00:00
abstract::Aminotransferases (ATs) had previously been detected after native electrophoresis. We show now that aminotransferase(s) of Propionibacterium freudenreichii can be detected after sodium dodecyl sulphate-polyacrylamide gel electrophoresis (SDS-PAGE). Moreover, it retained a high activity (84%) in the presence of 0.23% S...
journal_title:Journal of microbiological methods
pub_type: 杂志文章
doi:10.1016/s0167-7012(02)00060-x
更新日期:2002-09-01 00:00:00
abstract::A real-time PCR (RTm-PCR) assay using fluorescently labeled oligonucleotides (TaqMan probes) was used to detect and quantify the recombinant Rhodococcus sp. strain RHA1(fcb) in soil. One primer and probe set targeted a hypervariable region of the 16S rRNA gene unique to strain RHA1(fcb) and its phylogenetic relatives,...
journal_title:Journal of microbiological methods
pub_type: 杂志文章
doi:10.1016/s0167-7012(02)00067-2
更新日期:2002-10-01 00:00:00
abstract::In this research work, the synthesis of Ag doped hydroxyapatite coatings for dental or orthopedic implants was performed. The main goal was to determine the influence of Ag content on the roughness and antimicrobial performance of the prepared thin films. The films were deposited on Ti6Al4V alloy by means of RF magnet...
journal_title:Journal of microbiological methods
pub_type: 杂志文章
doi:10.1016/j.mimet.2016.03.016
更新日期:2016-06-01 00:00:00
abstract::A common method for visualizing bacterial biofilms is through confocal laser scanning microscopy images. Current software packages separate connected-biofilm bacteria from unconnected bacteria, such as planktonic or dispersed bacteria, but do not save both image sequences, making interpretation of the two bacterial po...
journal_title:Journal of microbiological methods
pub_type: 杂志文章
doi:10.1016/j.mimet.2012.04.008
更新日期:2012-07-01 00:00:00
abstract::Centrifugation is a necessary concentrating step for the detection of Mycobacterium tuberculosis in a liquid culture. However, centrifugation is biologically hazardous and presents an obstacle in the development of an automated culture system. A bead-based bacterial concentration method, TRICORE, was recently develope...
journal_title:Journal of microbiological methods
pub_type: 杂志文章
doi:10.1016/j.mimet.2012.04.018
更新日期:2012-09-01 00:00:00
abstract::We describe a simple method for measuring luciferase activity in the stationary phase of Lactococcus lactis. Due to large fluctuations in the energy and redox pools of stationary phase bacterial cells, measurement of luciferase activities does not yield reliable results. Upon addition of relatively small amounts of gl...
journal_title:Journal of microbiological methods
pub_type: 杂志文章
doi:10.1016/j.mimet.2006.06.013
更新日期:2006-12-01 00:00:00
abstract::Several outbreaks of foodborne yersiniosis have been documented and this disease continues to be source of infections transmitted through foods. The selective agars most commonly used to isolate Yersinia enterocolitica in clinical, food and environmental samples, cefsulodin-irgasan-novobiocin (CIN) and MacConkey (MAC)...
journal_title:Journal of microbiological methods
pub_type: 杂志文章
doi:10.1016/j.mimet.2007.11.019
更新日期:2008-02-01 00:00:00
abstract::A real-time quantitative polymerase chain reaction (Q-PCR) assay was developed for detecting and quantifying Escherichia coli in water samples from agricultural watersheds. The assay included optimization of DNA extraction and purification from water samples, and Q-PCR amplification conditions using newly designed spe...
journal_title:Journal of microbiological methods
pub_type: 杂志文章
doi:10.1016/j.mimet.2007.02.016
更新日期:2007-06-01 00:00:00
abstract::Amplification of high GC content genes by PCR is a major challenge during the creation of recombinant GC-rich DNA constructs. This may be due to the difficulty in DNA denaturation or the possibility of forming secondary structures from DNA templates. Tools have been described to address the technical problems associat...
journal_title:Journal of microbiological methods
pub_type: 杂志文章
doi:10.1016/j.mimet.2020.106121
更新日期:2020-12-13 00:00:00
abstract::MALDI-ToF MS can be used to identify microorganisms directly from blood cultures. This study compared two methods of sample preparation. Similar levels of genus- (91% vs 90%) and species-level identifications (79% vs 74%) were obtained with differential centrifugation and SDS methods. The SDS method is faster and requ...
journal_title:Journal of microbiological methods
pub_type: 杂志文章
doi:10.1016/j.mimet.2016.05.026
更新日期:2016-08-01 00:00:00
abstract::Development of a high-throughput eukaryotic screening procedure is important to increase success in obtaining improved enzymes through directed enzyme evolution. This procedure was developed for the yeast Yarrowia lipolytica which becomes the second eukaryotic host for this purpose. The extracellular lipase Lip2 was u...
journal_title:Journal of microbiological methods
pub_type: 杂志文章
doi:10.1016/j.mimet.2007.06.008
更新日期:2007-09-01 00:00:00
abstract::Phytophthora blight of pepper is a completely destructive plant disease caused by the oomycete pathogen Phytophthora capsici Leonian. Phytophthora disease is responsible for major losses in pepper production and the pathogen can survive in soil in the absence of the host plant for many years. Currently, there are no e...
journal_title:Journal of microbiological methods
pub_type: 杂志文章
doi:10.1016/j.mimet.2009.04.006
更新日期:2009-07-01 00:00:00
abstract::Time of Flight-Secondary Ion Mass Spectrometry (ToF-SIMS) was used to study compositional characteristics of Extracellular Polymeric Substances (EPS) and compared these to characteristics of the EPS-matrix of intact diatom biofilms. Three benthic diatoms species were investigated, Cylindrotheca closterium, Navicula mu...
journal_title:Journal of microbiological methods
pub_type: 杂志文章
doi:10.1016/j.mimet.2005.10.001
更新日期:2006-06-01 00:00:00
abstract::Staphylococcus aureus is a versatile bacterial opportunist responsible for a wide spectrum of infections. Several genomes of this major human pathogen have been publicly available for almost 10 years, but comprehensive links between virulence or epidemicity and genome content of the bacterium are still missing. This p...
journal_title:Journal of microbiological methods
pub_type: 杂志文章
doi:10.1016/j.mimet.2010.12.025
更新日期:2011-02-01 00:00:00
abstract::Paper-based nucleic acid testing techniques are increasingly in demand. Hence, we have developed a simple and cheap paper fluidic device to detect multiple gene targets in Leptospira. Fluidic channels of the penta-clover device are drawn using a correction pen on Whatman filter paper 1. The fluid blocks the pores of t...
journal_title:Journal of microbiological methods
pub_type: 杂志文章
doi:10.1016/j.mimet.2020.105962
更新日期:2020-07-01 00:00:00
abstract::An etiological relationship between periodontitis, a significant oral health problem, and the anaerobe Porphyromonas gingivalis may be related to the expression of a variety of putative virulence factors. The objective of the experiments described here was to develop a quantitative reverse transcription polymerase cha...
journal_title:Journal of microbiological methods
pub_type: 杂志文章
doi:10.1016/s0167-7012(01)00362-1
更新日期:2002-04-01 00:00:00
abstract::Laccase is a key enzyme in the degradation of lignin by fungi. Reports indicate that the activity of this enzyme ranges from 3.5 to 484,000 U L(-1). Our aim was to analyze how laccase activity is calculated in the literature, and to determine statistically whether variations in activity are due to biological propertie...
journal_title:Journal of microbiological methods
pub_type: 杂志文章
doi:10.1016/j.mimet.2015.10.007
更新日期:2015-12-01 00:00:00
abstract::Listeria monocytogenes is an important foodborne pathogen responsible for non-invasive and invasive diseases in the elderly, pregnant women, neonates and immunocompromised populations. This bacterium has many similarities with other non-pathogenic Listeria species which makes its detection from food and environmental ...
journal_title:Journal of microbiological methods
pub_type: 杂志文章,评审
doi:10.1016/j.mimet.2012.01.002
更新日期:2012-03-01 00:00:00
abstract::Targeted mutagenesis is one of the major tools for determining the function of a given gene and its involvement in bacterial pathogenesis. In mycobacteria, gene deletion is often accomplished by using allelic exchange techniques that commonly utilise a suicide delivery vector. We have adapted a widely-used suicide del...
journal_title:Journal of microbiological methods
pub_type: 杂志文章
doi:10.1016/j.mimet.2010.07.014
更新日期:2010-10-01 00:00:00