Metal-depleted Medium
Metal-depleted Medium - Related Videos
02:45
Culturing Neisseria gonorrhoeae in Metal-Depleted Conditions
0 Views •
2025
Source: Maurakis, S., and Cornelissen, C. N. Metal-Limited Growth of Neisseria gonorrhoeae for Characterization of Metal-Responsive Genes and Metal Acquisition from Host Ligands. J. Vis. Exp. (2020)This video demonstrates the procedure for growing Neisseria gonorrhoeae under metal-limited conditions using a defined, metal-depleted medium.
06:17
Depletion of Specific Cell Populations by Complement Depletion
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Cited by 15 •
2010
To effectively study the function of immune cell populations their purification is often required. Complement depletion is a fast and inexpensive technique for the isolation of immune cell populations with high purity.
13:34
Generation of Scalable, Metallic High-Aspect Ratio Nanocomposites in a Biological Liquid Medium
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Cited by 13 •
2015
Here we present a protocol to synthesize novel, high-aspect ratio biocomposites under biological conditions and in liquid media. The biocomposites scale from nanometers to micrometers in diameter and length, respectively. Copper nanoparticles (CNPs) and copper sulfate combined with cystine are the key components for the synthesis.
02:24
Metal-Limited Bacterial Growth Assay to Study the Role of Metal-Responsive Genes
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2025
Source: Maurakis, S., et al. Metal-Limited Growth of Neisseria gonorrhoeae for Characterization of Metal-Responsive Genes and Metal Acquisition from Host Ligands. J. Vis. Exp. (2020).This video demonstrates a metal-limited bacterial growth assay to study the role of metal-responsive genes. Wild-type and mutant bacteria grown in metal-depleted medium are incubated with metal-ligand, and their growth is monitored using a plate reader. Under metal-depleted conditions, the wild-type bacteria...
08:50
Depletion and Reconstitution of Macrophages in Mice
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Cited by 118 •
2012
Macrophages play a central role in homeostasis and pathology in many tissues. The protocol presented here describes methods for depleting macrophages in vivo, deriving polarized macrophages from bone marrow aspirates, and adoptively transferring macrophages into mice. These techniques allow determination of the role that polarized macrophages play in health and disease.
FAQs
Chelating agents bind metal ions in the medium, reducing the fraction that remains bioavailable to microorganisms or cultured cells. This distinction matters because a medium can contain residual metals while still imposing functional limitation. Researchers can therefore examine responses to restricted access to metals rather than relying only on the total amount present.
Even small unintended metal inputs can weaken the limitation being studied and make experimental conditions less consistent. Residual ions may come from reagents or vessels, so preparation requires careful control of these sources. Better control helps researchers attribute changes in growth, enzyme function, or stress responses to metal availability rather than uncontrolled contamination.
Metal limitation can expose how cells maintain homeostasis, regulate transport, and adjust enzyme function when essential ions become scarce. It may also trigger measurable stress responses and changes in metabolic activity or gene expression. These observations help connect an organism’s metal requirements with the cellular systems used to acquire and use those nutrients.
The medium can be prepared by omitting metal supplements or by reducing residual ions before the experiment. Chelating agents may be used to bind remaining metals and lower their bioavailable fraction. Researchers must also control contamination from reagents and vessels, because inconsistent preparation can obscure the biological effect of metal limitation.
A metal-replete control provides a reference for interpreting the effects of restricted metal availability. Comparing the two conditions can reveal differences in growth, gene expression, metabolic activity, enzyme function, or stress responses. This paired design helps distinguish changes specifically associated with deficiency from baseline properties of the microorganism or cultured cell.
Biologists use this approach when they need to investigate metal homeostasis, transport, enzyme requirements, stress responses, or nutrient dependence. It is relevant to experiments with microorganisms and cultured cells, especially when researchers want to determine how these systems acquire and use essential metals under limited conditions rather than under routine, metal-replete growth.