Pure Water
Pure Water - Related Videos
02:08
Generating Pure Bacterial Cultures in a Liquid Medium
0 Views •
2025
Source: Brumfield, K. D. et. al., Laboratory Techniques Used to Maintain and Differentiate Biotypes of Vibrio cholerae Clinical and Environmental Isolates. J. Vis. Exp. (2017)This video demonstrates the growth of bacterial cultures in a liquid medium. Shaking promotes aeration and distributes nutrients evenly, supporting exponential growth and resulting in a uniform, metabolically active suspension suitable for downstream applications.
01:29
Need for Obtaining Pure Cultures
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2025
Pure cultures, defined as the growth of a single microorganism species isolated from mixed populations, are fundamental tools in microbiological research and practical applications. These cultures ensure genetic and physiological uniformity, allowing researchers to study microbial traits under controlled conditions.Isolation and Maintenance of Pure CulturesObtaining a pure culture involves isolating a single microbial type from a mixed sample through techniques such as serial dilutions, streak...
08:25
OnePot PURE Cell-Free System
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Cited by 22 •
2021
We present a fast and cost-effective method to produce the recombinant PURE cell-free TX-TL system using standard laboratory equipment.
08:00
Screening for Endocrine Activity in Water Using Commercially-available In Vitro Transactivation Bioassays
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Cited by 12 •
2016
A protocol to screen for endocrine activity in organic extracts of water samples, including treated wastewater effluent and surface (receiving) water, was adapted using commercially available division-arrested ("freeze and thaw") in vitro transactivation bioassays.
01:24
Techniques for Isolation of Pure Cultures
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2025
Microorganisms are routinely cultured in the laboratory using various techniques to isolate, grow, and quantify them for further study. These methods rely on inoculating microorganisms into a suitable growth medium under aseptic conditions to prevent contamination. Depending on the objective, inoculation can involve direct transfer or the use of diluted bacterial suspensions as the inoculum.Streak-Plate Method for IsolationThe streak-plate method is a common technique for obtaining pure...
FAQs
Autoionization occurs when water molecules form hydronium and hydroxide ions. In pure water, these ions are produced in equal concentrations, so neither acidic nor basic behavior dominates. At 25 °C, this balance corresponds to a neutral pH near 7. The equilibrium explains why purified water is not chemically ion-free, even when dissolved contaminants are minimized.
These substances can introduce contamination into solutions prepared with purified water and may interfere with the intended chemical composition. Because analytical measurements depend on controlled conditions, unwanted dissolved material can reduce accuracy. Minimizing ions, gases, and organic compounds therefore helps laboratories use water as a more reliable solvent, reagent, or calibration medium.
Purity controls how consistently water behaves from one preparation or experiment to another. Unwanted dissolved substances or microorganisms can alter the chemical environment and contribute uncontrolled variation. Using water with minimal contaminants reduces these sources of uncertainty, helping chemical and biological experiments produce results that are more comparable and reproducible across repeated trials.
Purified water serves as a solvent and reagent during solution preparation. Its low contaminant content helps ensure that measured substances, rather than unintended ions, gases, organic compounds, or microorganisms, determine the resulting solution composition. This is especially important when laboratories need controlled chemical conditions and measurements that remain accurate across multiple preparations.
A calibration medium must provide a controlled chemical background so measurements can be related to known conditions. Purified water supports this role by minimizing dissolved constituents that could affect the analytical system. Its defined autoionization behavior, including a neutral pH near 7 at 25 °C, also provides relevant chemical context for interpreting measurements.
Purified water is useful for laboratory cleaning because it minimizes the introduction of dissolved contaminants during rinsing or washing. This helps prevent residues from affecting later chemical or biological work. Maintaining low contamination supports measurement accuracy and reproducibility, particularly when cleaned equipment will contact prepared solutions, reagents, or samples in subsequent experiments.