Author:Eduardo Ortiz

Reverse transcription quantitative PCR (RT-qPCR) is one of the most widely used molecular biology techniques for RNA analysis. It is foundational in gene expression studies, viral RNA detection, transcript quantification, and RNA-based pathway analysis across academic, industrial, and public research laboratories. However, RT-qPCR is also inherently sensitive to variability—particularly during the reverse transcription (RT) step, …
Continue reading RT SuperMix for qPCR: Ensuring Consistency, Sensitivity, and Reproducibility in Reverse Transcription–qPCR Workflows

In modern molecular biology and molecular diagnostics laboratories, PCR-based methods (including conventional PCR, RT-PCR, and real-time qPCR) are trusted because they are sensitive, specific, and scalable. But that power comes with a reality every experienced scientist knows: PCR results are only as reliable as the quality system behind them. When targets are low-copy, inhibitors are …
Continue reading Critical Infectious Disease PCR Quality Control: Ensuring Reliability in High-Impact Molecular Testing

In infectious-disease molecular workflows, PCR is valued because it is sensitive, fast, and adaptable—from single-target assays to high-plex panels. But sensitivity cuts both ways: the same chemistry that amplifies rare target copies can also amplify contaminants, tolerate subtle extraction variability, or drift when reagents and instruments change over time. That’s why PCR quality control (QC) …
Continue reading Infection Disease PCR Quality Control: Building Trustworthy RT-PCR/qPCR Results in the Laboratory

Why GI RT-qPCR needs stronger QC than “easy” matrices Stool is inhibitor-rich Stool can contain substances that interfere with polymerases or nucleic acid binding/cleanup, reducing amplification efficiency or blocking it entirely. Inhibition controls are therefore a core GI PCR concept. A peer-reviewed review on inhibition controls emphasizes that inhibitors occur across specimen matrices and can …
Continue reading Gastrointestinal (GI) Disease PCR Quality Control: Practical Run Controls for Reliable Multiplex RT-qPCR Workflows

What “Respiratory Disease PCR Quality Control” means in the lab In RT-qPCR workflows, quality control is the set of planned checks that verify each stage of the process: Pre-analytical integrity (collection medium, transport conditions, inhibitors, sample handling) Extraction performance (nucleic acid recovery and reagent integrity) Amplification performance (enzyme activity, cycling conditions, contamination control) Detection and …
Continue reading Respiratory Disease PCR Quality Control: Practical Run Controls for Reliable RT-qPCR Workflows

Indexing fundamentals  What an “index” is An index is a short DNA tag incorporated into each library so reads can be assigned back to the correct sample after sequencing (demultiplexing). If you want a plain-language refresher, NIH’s NHGRI pages are excellent: DNA sequencing basics (genome.gov) and the Next-generation sequencing glossary entry (genome.gov).  i7 vs i5 …
Continue reading TruePrep Index Kit V2 for Illumina: Dual-Index Barcoding for High-Confidence Multiplexed NGS

The Viral DNA/RNA Mini Kit Pro is a specialized nucleic acid extraction system designed for the isolation of viral DNA and viral RNA from serum, plasma, swabs, transport media, cell-free body fluids, and low-titer viral samples. The kit uses column-based silica membrane purification, optimized lysis chemistry, chaotropic salts, and high-affinity capture matrices to recover viral …
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PCR-Free DNA Adapters Set 1 for MGI are specialized double-stranded oligonucleotide adapters optimized for PCR-free whole-genome sequencing (WGS) on MGI/BGI sequencing platforms. These adapters support high-fidelity ligation, reduce amplification bias, preserve allelic balance, and improve variant calling accuracy, making them essential for population genomics, clinical sequencing, and structural variant analysis. This article provides an in-depth …
Continue reading PCR-Free DNA Adapters Set 1 for MGI: Technical Review, Molecular Workflow, and Sequencing Performance

A DNA PCR Quantitative Positive Control is an essential reference material used in quantitative polymerase chain reaction (qPCR) and digital PCR (dPCR) workflows to validate assay performance, verify amplification efficiency, calibrate standard curves, and confirm target-specific detection. In molecular biology laboratories, clinical diagnostic units, and pathogen surveillance programs, positive controls ensure that DNA amplification, fluorescence …
Continue reading DNA PCR Quantitative Positive Control: Technical Overview, Calibration Role, and Molecular Diagnostic Applications

Introduction Hot Start DNA Polymerase (with Buffer, with MgCl₂, without dNTP) is a specialized PCR formulation designed to improve amplification specificity, reduce nonspecific background, and enable robust amplification from complex templates. This reagent configuration is widely used in qPCR, endpoint PCR, high-fidelity amplification, genotyping, sequencing library preparation, and low-copy detection assays. The formulation consists of: …
Continue reading Hot Start DNA Polymerase (With Buffer, With MgCl₂, Without dNTP): Technical Overview, Molecular Mechanisms, Performance Characteristics, and Research Applications