• 22 czerwca, 2021

Szybkie i zautomatyzowane wykrywanie

Szybkie i zautomatyzowane wykrywanie wspólnych genów karbapenemaz za pomocą multipleksowego PCR w czasie rzeczywistym w systemie BD MAX

Quick detection of carbapenemases in Gram-negative bacilli is important for correct antibiotic therapy, prevention of additional spreading and surveillance functions. We analyzed the present incidence of gene variants and designed two multiplex PCRs with hydrolysis probes. The assay was developed for the BD MAX™ system that mixes DNA extraction and PCR in a totally automated process offering outcomes inside three h and was evaluated for detection of carbapenemases from bacterial isolates and instantly from rectal swabs. The assay has a theoretic protection of 97.1% for carbapenemases detected over the past years by the German Nationwide Reference Laboratory (NRL).

A set of 151 isolates from the NRL was used and all carbapenemase-positive micro organism (58/58) had been recognized accurately. The direct-PCR on rectal swabs revealed further carbapenemase genes in 7 samples that weren’t recognized by the culture-based technique used as reference technique. The assay permits detection of carbapenemases from medical isolates and may additionally assist in speedy detection instantly from rectal samples.


Wykrywanie genu Rlm1 oporności na czarną nóżkę w podwójnie niskich dostępach do rzepaku z prowincji Syczuan za pomocą reakcji PCR specyficznych dla alleli kompetytywnych 

Blackleg is a critical illness in Brassica vegetation, inflicting reasonable to extreme yield losses in rapeseed worldwide. Though China has not suffered from this illness but (extra aggressive Leptosphaeria maculans shouldn’t be current but), it’s essential to take provisions in breeding for illness resistance to have wonderful blackleg-resistant cultivars already within the fields or within the breeding pipeline. Probably the most environment friendly technique for controlling this illness is breeding vegetation with recognized resistance genes. We chosen 135 rapeseed accessions in Sichuan, together with 30 parental supplies and 105 hybrids, and we decided their glucosinolate and erucic acid content material and confirmed 17 double-low supplies.

A just lately developed single-nucleotide polymorphism (SNP) marker, SNP_208, was used to genotype allelic Rlm1/rlm1 on chromosome A07, and 87 AvrLm1-resistant supplies. Mixed with the above-mentioned seed high quality information, we recognized 11 AvrLm1-resistant double-low rapeseed accessions, together with 9 parental supplies and two hybrids. This research lays the muse of particular R gene-oriented breeding, within the case that the aggressive Leptosphaeria maculans invades and establishes in China sooner or later and a strong and fewer labor consuming technique to determine resistance in canola germplasm.

Opracowanie i walidacja testów PCR w czasie rzeczywistym do wykrywania gatunków Ehrlichia i E. chaffeensis w próbkach klinicznych 

Ehrlichiosis, attributable to Gram-negative micro organism of the genus Ehrlichia, is taken into account an rising infectious illness as a result of growing quantity of reported instances. Signs are non-specific and happen inside 1 to 2 weeks following the chew of an contaminated tick. Confirmatory laboratory diagnostic strategies fluctuate in sensitivity and specimen necessities, which may result in delayed analysis. PCR testing serves as an environment friendly method to Ehrlichia affirmation within the acute stage of sickness.

Printed assays have been successfully used to detect human ehrlichiosis at restrict of detections starting from 10 to 50 genomic copies (GC) of Ehrlichia DNA. With the invention of recent species able to human an infection, we wished to develop assays which might be delicate and embody a variety of Ehrlichia. Right here we developed and validated two delicate and particular real-time PCR assays (PanE1 and PanE2) for the detection of Ehrlichia species, in addition to two real-time PCR assays (ECh2 and ECh4) for the detection of Ehrlichia chaffeensis, particularly.

The restrict of detection was decided to be 10 GC per response with 100% confidence, and as little as 1 GC with decrease efficiencies. Accuracy was assessed at 100% correlation. Specificity from exclusivity testing demonstrated that neither the Ehrlichia species assays (n = 60), nor the E. chaffeensis particular assays (n = 64) had cross reactivity with close to neighbors or environmental micro organism. A constructive predictive worth of 100% and a destructive predictive worth of ≥93% was decided by evaluating banked medical specimens from 62 sufferers with the assays. These real-time PCR assays are efficient instruments to detect human Ehrlichia species through the acute stage of sickness. Early detection of Ehrlichia an infection by these real-time PCR assays can facilitate analysis and therapy.

Skuteczność analizy PCR krótkich powtórzeń tandemowych o zmniejszonej wielkości dla zdegradowanych próbek DNA 

Background: Brief tandem repeats (STR) typing is a necessary evaluation technique for human identification in forensic area. When DNAs obtained from the sphere as evidences are severely degraded or in too small quantities, STR evaluation usually exhibits allele drop-out.

Goal: To enhance STR evaluation for degraded DNA or hint DNA, reduced-size STR (rSTR) polymerase chain response (PCR) system was devised by choosing comparatively large-size STR loci.

Strategies: The rSTR PCR system consisted of eight loci (amelogenin, SE33, CSF1PO, D7S820, D13S317, D2S1338, TPOX, and FGA). The scale of PCR product was decreased by designing new primers within the flanking area. The effectivity of this technique was verified in opposition to present kits via concordance research, sensitivity research, effectivity research, and casework pattern research.

Outcomes: The scale of PCR product in the rSTR PCR system was decreased to be lower than 322 bp. The amplicon of every locus was decreased by about 100 bp on common. Outcomes of this rSTR PCR system had been confirmed utilizing 146 Korean samples and different industrial kits. The rSTR PCR system was able to analyzing DNA samples with a minimal quantity of DNA of 16 pg and a degradation index of 4.215.

Conclusion: The rSTR PCR system was simpler than different PCR kits for acquiring genetic profiles from a small quantity of DNA or degraded DNA. The mix of this new system and different industrial kits is simpler than present techniques. This mixture is anticipated to be useful for the identification of unidentified our bodies and skeletal samples.

Przyczyna zgonu na podstawie systematycznych badań sekcyjnych u pacjentów z dodatnim wynikiem testu PCR tkanek SARS-CoV2 podczas pandemii COVID-19 

Significance: Evaluation of the causative affiliation between the COVID-19 and explanation for loss of life has been hampered by restricted availability of systematically carried out autopsies. We aimed to current autopsy-confirmed causes of loss of life in sufferers who died with COVID-19 and to evaluate the affiliation between thrombosis and diffuse alveolar harm per COVID-19 (DAD).

Strategies: Consecutive forensic (n=60) and medical (n=42) autopsies with constructive postmortem SARS-CoV2 PCR in lungs (age 73±14 years, 50% males) had been included. Explanation for loss of life evaluation was based mostly on a overview of medical information and histology experiences. Thrombotic phenomena in lungs had been outlined as pulmonary thromboembolism (PE), thrombosis in pulmonary artery branches or microangiopathy in capillary vessels.

Outcomes: COVID-19 triggered or contributed to loss of life in 71% of medical and 83% of forensic autopsies, in whom important DAD was noticed. Of the sufferers with COVID-19 as the first explanation for loss of life, solely 19% had no thrombotic phenomena within the lungs, versus 38% amongst these with COVID-19 as a contributing explanation for loss of life and 54% amongst sufferers whose loss of life was not associated to COVID-19 (p=0.002). PE was noticed in 5 sufferers. Two sufferers fulfilled the standards for lymphocyte myocarditis.

Conclusions: Overwhelming majority of all PCR-positive fatalities, together with out-of-hospital deaths, throughout SARS-CoV2 pandemic had been associated to DAD attributable to COVID-19. Pulmonary artery thrombosis and microangiopathy in pulmonary tissue had been widespread and related to the presence of DAD, whereas venous PE was hardly ever noticed. Histology-confirmed lymphocyte myocarditis was a uncommon discovering.

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