AIM To investigate the dose-response effect of humic acid (HA) on the quantitative real time polymerase chain reaction (QRT-PCR) inhibition and the efficiency of Taq polymerase increment in preventing inhibition by HA in DNA extracted from ancient bones. METHODS DNA was isolated from bone samples and DNA quantification was conducted with the real-time 5' exonuclease detection assay (TaqMan), ...

The genetic capacity to fix gaseous nitrogen (N) is distributed among diverse diazotrophs belonging to the Bacteria and Archaea. However, only a subset of the putative diazotrophs present actively fix N at any given time in the environment. We experimentally tested whether the availability of carbon and inhibition by oxygen constrain N fixation by diazotrophs in coastal seawater. The goal was t...

vaccines is considered as a critical point and in-process of quality control (IPQC) test of vaccine production. Rapid tests, like real time PCR, are more appropriated when the production occurs at industrial scale because of the amounts of starting materials and the excess of consumed time required. In the current study, a real-time quantitative reverse transcription-polymerase chain reaction...

The ubiquity of fecal indicator bacteria such as Escherichia coli and Enterococcus spp. in urban environments makes tracking of fecal contamination extremely challenging. A multitiered approach was used to assess sources of fecal pollution in Ballona Creek, an urban watershed that drains to the Santa Monica Bay (SMB) near Los Angeles, Calif. A mass-based design at six main-stem sites and four m...

introduction butyrivibrio fibrisolvens strains are presently recognized as the major butyrate-producing bacteria found in the rumen and digestive track of many animals and also in the human gut. in this study we reported the development of two dna based techniques, quantitative competitive (qc) pcr and absolute based real-time pcr, for enumerating butyrivibrio fibrisolvens strains. despite the ...