ABSTRACT
Objective To establish a loop-mediated isothermal amplification method for detection of Campylobacter jejuni.Methods Six sets of primers were designed to recognize Campylobacter jejuni specific gene hipO.One was selected as the optimal primer and its specificity and sensitivity to Campylobacter jejuni were evaluated by LAMP reaction in 60 minutes at 62℃.Results The results recorded by the turbidity meter showed that the sensitivity of LAMP with a detection limit of 6.97×102 copies/μl was ten times that of PCR.Conclusion LAMP is a potential and valuable method of detection of Campylobacter jejuni due to its rapidity,simplicity,low cost and accuracy.It is especially suitable for grass-roots medical units.
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Objective To find simple and effective methods of preservation for Achromobacter xylosoxidans bacteriophages.Methods The plaque forming unit( PFU) of surviving phages under different preservation conditions and temperatures at different time points was determined.Results and Conclusion The titers of phiAxp-1 and phiAxp-2 main-tained at the initial 1010 PFU/ml, and that of phiAxp-3 decreased slightly from 1011 PFU/ml to 1010 PFU/ml 16 months after the three Achromobacter xylosoxidans bacteriophages were stored in glycerol and dimethyl sulfoxide at -80℃, -20℃and 4℃.When stored in chloroform at 4℃for 16 months, the titers of all the three phages decreased slightly but were higher than at other temperatures (-80℃, -20℃, room temperature, and 37℃) .Thus these methods can effectively preserve Achromobacter xylosoxidans bacteriophages.
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<p><b>OBJECTIVE</b>To establish a HPLC-ELSD fingerprint of Marsdenia tenacissima from different habitats, in order to provide a reliable method for scientific assessment and effective quality control.</p><p><b>METHOD</b>HPLC-ELSD was adopted to determine 25 baches of M. tenacissima herbs from different habitats. Traditional Chinese medicine chromatographic fingerprint similarity software assessment system 2004 developed by China Pharmacopoeia Committee was adopted to establish a common mode chart and assess chromatographic similarity based on the degree of correlation.</p><p><b>RESULT</b>The common mode for M. tenacissima herb C21 steroidal fingerprint was established, including 11 common characteristic peaks. Among them, 10 were identified. According to the assessment on the similarity of 25 batches of samples, 80% of them showed a similarity of over 0.80 in steroidal HPLC-ELSD fingerprint.</p><p><b>CONCLUSION</b>The method can be used to assess the quality of M. tenacissima.</p>