Praxilabs

The DNA Extraction Virtual Lab provides an interactive environment where students learn how to isolate DNA using the phenol/chloroform method without the risks and limitations of a physical laboratory. Through guided simulations, learners gain hands-on experience with cell lysis, DNA precipitation, and purification while understanding the role of essential reagents and laboratory equipment. The virtual experiment reinforces core molecular biology concepts, strengthens laboratory skills, and demonstrates how purified DNA supports downstream applications such as genetic research, disease diagnosis, vaccine development, forensic investigations, and biotechnology. It is an effective solution for building practical knowledge through safe, repeatable, and engaging virtual experimentation. 

Warder Titration is a classical acid-base titration technique used to determine the individual concentrations of sodium hydroxide (NaOH) and sodium carbonate (Na₂CO₃) in a mixed solution. The method employs two indicators—phenolphthalein and methyl orange—to identify two distinct endpoints during titration with hydrochloric acid. These endpoints correspond to the sequential neutralization of hydroxide and carbonate ions, allowing accurate calculation of each component's concentration. Warder Titration also helps students understand neutralization reactions, acid-base titration principles, and the role of double-indicator methods in quantitative chemical analysis, making it an essential experiment in analytical chemistry laboratories.

The Urease Test is a widely used biochemical test in microbiology that determines whether microorganisms produce the enzyme urease, which hydrolyzes urea into ammonia and carbon dioxide. This reaction increases the pH of the medium, causing the phenol red indicator to change from its original color to deep pink, indicating a positive result. The test is especially valuable for distinguishing rapid urease-producing organisms such as Proteus species from other lactose non-fermenting enteric bacteria. Commonly used in microbiology laboratories and education, the Urease Test helps students understand bacterial metabolism, enzyme activity, and the identification of clinically important microorganisms. 

The Determination of Acetic Acid in Vinegar by Titration experiment demonstrates how acid-base titration is used to accurately measure the concentration of acetic acid in commercial vinegar. By reacting vinegar with a standardized sodium hydroxide (NaOH) solution and using phenolphthalein as an indicator, students observe the neutralization process and identify the titration endpoint. This laboratory exercise introduces essential concepts of volumetric analysis, standard solutions, quantitative reactions, and analytical chemistry techniques. It also strengthens practical laboratory skills, including precise titration procedures, data analysis, and calculation of acid concentration, making it an essential experiment for chemistry education and analytical laboratory training.

Monoclonal Antibody Production is a comprehensive laboratory process that demonstrates how highly specific antibodies are generated using hybridoma technology. Students learn essential techniques, including sterile cell culture, mouse immunization, spleen cell isolation, myeloma cell fusion with polyethylene glycol (PEG), HAT selection, hybridoma cloning, FACS preparation, and ELISA-based antibody screening. The workflow also covers evaluating cell confluency, serial serum dilution, and hybridoma cryopreservation. By following each stage of monoclonal antibody production, learners gain a deeper understanding of antibody development, laboratory best practices, and the experimental methods widely used in biomedical research, diagnostics, and therapeutic antibody manufacturing.

Non Ohmic Resistance is a key concept in electricity that demonstrates how certain materials exhibit a nonlinear relationship between current and voltage. Unlike Ohmic conductors, non-Ohmic resistors experience changes in resistance as temperature rises with increasing applied voltage. Through this experiment, students investigate the I-V characteristics of a non-Ohmic resistor, compare its behavior with Ohmic resistance, and understand why it does not follow Ohm's law. By collecting and analyzing experimental data, learners gain practical insights into electrical conductivity, resistance variation, and the principles governing non-Ohmic materials in real-world electrical and electronic applications.

Determination of Citric Acid is a fundamental analytical chemistry experiment that demonstrates how acid-base titration is used to measure citric acid concentration in lemon-flavored soda beverages. Using a standard sodium hydroxide solution and phenolphthalein indicator, students identify the endpoint of neutralization and calculate the concentration of citric acid through volumetric analysis. The experiment reinforces essential laboratory concepts, including standard solutions, quantitative analysis, neutralization reactions, titration calculations, and data interpretation. By applying theoretical knowledge to a practical beverage analysis, learners gain valuable experience in analytical techniques widely used in food quality control, research laboratories, and chemistry education.

The Chloride Test in Water is a fundamental analytical chemistry experiment that measures chloride ion concentration using the indirect Volhard titration method. Students learn how excess silver nitrate reacts with chloride ions before the remaining silver ions are back-titrated with thiocyanate in an acidic medium, using ferric alum as an indicator. The experiment introduces key concepts such as precipitimetry, solubility product (Ksp), endpoint detection, and precipitation reactions. By completing this laboratory exercise, learners gain practical experience in chloride analysis, understand the theory behind chloride determination, and develop essential quantitative analysis skills for environmental, industrial, and water quality testing.