Crude Virus Suspension
Crude Virus Suspension - Related Videos
03:39
Preparation of Virus-Enriched Suspension Using Stepwise Sucrose Centrifugation
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2026
Source: Vijayraghavan, S. and Kantor, B. A Protocol for the Production of Integrase-deficient Lentiviral Vectors for CRISPR/Cas9-mediated Gene Knockout in Dividing Cells. J. Vis. Exp., (2017)This video demonstrates a two-step ultracentrifugation method using sucrose gradients and cushions to purify and concentrate viral particles from cell culture supernatant. The procedure enables separation based on buoyant density, allowing recovery of intact virus suitable for downstream applications.
08:56
Combining Analysis of DNA in a Crude Virion Extraction with the Analysis of RNA from Infected Leaves to Discover New Virus Genomes
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2018
Here we present a new approach to identify plant viruses with double-strand DNA genomes. We use standard methods to extract DNA and RNA from infected leaves and carry out next-generation sequencing. Bioinformatic tools assemble sequences into contigs, identify contigs representing virus genomes and assign genomes to taxonomic groups.
03:58
Preparation of Crude Cell Extract from Vibrio natriegens
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2025
Source: Wiegand, D. J., et al. Cell-free Protein Expression Using the Rapidly Growing Bacterium Vibrio natriegens. J. Vis. Exp. (2019).This video demonstrates the preparation of a cell extract from Vibrio natriegens, a rapidly growing bacterium known for its high protein synthesis rate. The bacterial pellet is washed and resuspended in lysis buffer before sonication on ice to prevent cellular degradation. The lysate is centrifuged to separate insoluble cell debris, and the cell extract is...
08:37
Measurement of H2S in Crude Oil and Crude Oil Headspace Using Multidimensional Gas Chromatography, Deans Switching and Sulfur-selective Detection
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Cited by 11 •
2015
A multidimensional gas chromatography method for the analysis of dissolved hydrogen sulfide in liquid crude oil samples is presented. A Deans switch is used to heart-cut light sulfur gases for separation on a secondary column and detection on a sulfur chemiluminescence detector.
03:32
Cell-Free Protein Expression Using a Bacterial Crude Cell Extract
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2025
Source: Wiegand, D. J., et al. Cell-free Protein Expression Using the Rapidly Growing Bacterium Vibrio natriegens. J. Vis. Exp. (2019).This video demonstrates the use of a bacterial cell-free protein expression system based on Vibrio natriegens crude lysate to perform coupled in vitro transcription and translation. It highlights the preparation of a master mix with essential components and the step-by-step synthesis of functional proteins from a DNA template.
FAQs
Disruption breaks open infected cells or tissues, releasing virions along with intracellular debris, proteins, and nucleic acids. A subsequent low-speed centrifugation step removes larger particulate material while leaving virus particles and soluble contaminants in the liquid fraction. The effectiveness of this sequence influences how much biological material is recovered and how complex the resulting sample remains.
Its composition depends on the infected cells or tissues used and on how effectively those materials are disrupted and clarified. Different amounts of cellular debris, proteins, nucleic acids, and virus particles can therefore remain in the suspension. This variability affects sample quality and must be considered when comparing infectivity, antigen, or nucleic acid results.
A crude virus suspension retains substantial material originating from infected cells or tissues, whereas downstream purification is intended to separate virus particles from some of those accompanying components. As a result, the crude preparation provides accessible starting material but has greater compositional complexity. Researchers should account for this difference when interpreting measurements or planning later processing.
Biological usefulness depends on sample quality and whether virus activity is preserved during preparation and handling. Disruption must release virus particles, while clarification should remove larger debris without eliminating the particles needed for the intended experiment. Because the suspension also contains cellular contaminants, both biological activity and sample composition require evaluation before interpreting experimental outcomes.
The basic workflow starts with infected cells or tissues, followed by disruption to release virus particles. The disrupted material then undergoes basic clarification, commonly low-speed centrifugation, to remove larger debris. The resulting liquid contains the recovered virus together with soluble cellular components and is retained as starting material for assays, analysis, propagation, or further purification.
Researchers may use this preparation as starting material for virus propagation, infectivity assays, antigen analysis, or nucleic acid analysis. It is especially useful when the immediate goal is to work with recovered virus before applying additional purification. Each application requires attention to the suspension's variable composition, because contaminants can influence how results are interpreted.
Before downstream use, researchers should consider sample quality, biological activity, the amount of cellular material retained, and the purpose of the next experiment. A preparation suitable for an initial infectivity or nucleic acid analysis may still require further purification for later work. Appropriate containment is also necessary when handling material containing biologically active virus.