Results: 12

Evaluación de una reacción en cadena de la polimerasa en tiempo real simple y rápida para la cuantificación del ADN del virus de la hepatitis B
Evaluation of a simple and fast real time polymerase chain reaction assay for quantification of hepatitis B virus DNA

Rev. cuba. med. trop; 72 (2), 2020
Introducción: Los ensayos para cuantificar el ADN del virus de la hepatitis B (VHB) o carga viral son imprescindibles en el diagnóstico y en el seguimiento de los pacientes con hepatitis B crónica; de ahí que estén disponibles estuches diagnósticos para esta función. En el presente estudio se mue...

Molecular and serological characterization of occult hepatitis B among blood donors in Maputo, Mozambique

Mem. Inst. Oswaldo Cruz; 115 (), 2020
BACKGROUND Occult hepatitis B virus (HBV) - characterized by the absence of detectable HBsAg in the presence of HBV DNA - represents a potential threat for blood safety. OBJECTIVES This study was conducted with the aim to investigate the serological and molecular characterization of occult HBV infecti...

Rapid, specific, and sensitive detection of the ureR_1 gene in Klebsiella pneumoniae by loop-mediated isothermal amplification method

Braz. j. med. biol. res; 52 (3), 2019
Klebsiella pneumoniae is one of the main pathogenic bacteria that causes nosocomial infections, such as pneumonia, urinary tract infection, and sepsis. Therefore, the rapid and accurate detection of K. pneumoniae is important for the timely treatment of infectious patients. This study aimed to establish ...

Accuracy of a rapid molecular test for tuberculosis in sputum samples, bronchoalveolar lavage fluid, and tracheal aspirate obtained from patients with suspected pulmonary tuberculosis at a tertiary referral hospital

J. bras. pneumol; 45 (2), 2019
ABSTRACT Tuberculosis continues to be a major public health problem worldwide. The aim of the present study was to evaluate the accuracy of the Xpert MTB/RIF rapid molecular test for tuberculosis, using pulmonary samples obtained from patients treated at the Júlia Kubitschek Hospital, which is operated ...

Speeding up the diagnosis of multidrug-resistant tuberculosis in a high-burden region with the use of a commercial line probe assay

J. bras. pneumol; 45 (2), 2019
ABSTRACT Objective: To evaluate the rapid diagnosis of multidrug-resistant tuberculosis, by using a commercial line probe assay for rifampicin and isoniazid detection (LPA-plus), in the routine workflow of a tuberculosis reference laboratory. Methods: The LPA-plus was prospectively evaluated on 341 iso...

Yersinia pestis detection by loop-mediated isothermal amplification combined with magnetic bead capture of DNA

Braz. j. microbiol; 49 (1), 2018
ABSTRACT We developed a loop-mediated isothermal amplification (LAMP) assay for the detection of Y. pestis by targeting the 3a sequence on chromosome. All 11 species of the genus Yersinia were used to evaluate the specificity of LAMP and PCR, demonstrating that the primers had a high level of specificity...

Optimization of RT-PCR reactions in studies with genes of lignin biosynthetic route in Saccharum spontaneum

An. acad. bras. ciênc; 90 (1), 2018
ABSTRACT Saccharum spontaneum has been used for the development of energy cane a crop aimed to be used for the production of second-generation ethanol, or lignocellulosic ethanol. Lignin is a main challenge in the conversion of cell wall sugars into ethanol. In our studies to isolate the genes the lignin...

Molecular characterization of CHST11 and its potential role in nacre formation in pearl oyster Pinctada fucata martensii

Background: C4ST-1 catalyzes the transfer of sulfate groups in the sulfonation of chondroitin during chondroitin sulfate synthesis. Chondroitin sulfate consists of numerous copies of negatively charged sulfonic acid groups that participate in the nucleation process of biomineralization. In the present st...

Improved assembly procedure of viral RNA genomes amplified with Phi29 polymerase from new generation sequencing data

Biol. Res; 49 (), 2016
BACKGROUND: New sequencing technologies have opened the way to the discovery and the characterization of pathogenic viruses in clinical samples. However, the use of these new methods can require an amplification of viral RNA prior to the sequencing. Among all the available methods, the procedure based on...

Loop-mediated isothermal amplification assays for screening of bacterial integrons

Biol. Res; 47 (), 2014
BACKGROUND: The occurrence and prevalence of integrons in clinical microorganisms and their role played in antimicrobial resistance have been well studied recently. As screening and detection of integrons are concerned, current diagnostic methodologies are restricted by significant drawbacks and novel me...