Agar Plate Curing
Agar Plate Curing - Related Videos
01:20
Curing of Concrete
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2024
The hydration of cement takes place within the water-filled capillary pores. However, environmental elements can disrupt this process by evaporating water from the concrete surfaces. Sealed concrete with a water-cement ratio below 0.5 experiences self-desiccation, leading to water loss. The water loss in concrete is mitigated by curing. This technique involves keeping the concrete saturated to maintain the necessary temperature and moisture conditions, to optimally fill the spaces in the cement...
01:26
Curing Methods
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2024
Concrete members with a small surface-to-volume ratio are cured by oiling and moistening the forms before casting the concrete member. These forms can be left in place for a prolonged period to prevent moisture loss, and can be wetted if made of a material suitable for wetting. If the forms are removed early, the concrete member is moistened and covered with polythene sheets to maintain moisture. For large horizontal concrete surfaces exposed to dry weather, a temporary covering is suspended...
01:25
Accelerated Curing of Concrete
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2024
Accelerating concrete curing is achieved by applying heat and additional moisture. This process accelerates the hydration of the cement, resulting in an earlier strength gain in the concrete. Steam curing is a method wherein the concrete products are either transported through a chamber on a conveyor belt or encased in plastic, allowing steam at atmospheric pressure to circulate freely around them. This process begins with a phase of moist curing that typically lasts between 3 to 5 hours, after...
05:26
A Venturi Effect Can Help Cure Our Trees
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Cited by 24 •
2013
Compared to the more traditional hole-based methods, most of which require the tree to be drilled, tools with lenticular blades transform the basics of endotherapy easing the closure of the wound and allowing the natural uptake of the solutions.
04:36
Assay for Adhesion and Agar Invasion in S. cerevisiae
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Cited by 17 •
2006
We describe a qualitative assay for yeast adhesion and agar invasion as a measure of invasive and pseudohyphal differentiation. This simple assay can be used to assess the invasive phenotype of various mutants as well as the effects environmental cues and signaling pathways on yeast differentiation.
FAQs
The method targets plasmid maintenance rather than the bacterial chromosome. Growth on solid agar occurs under conditions that interfere with plasmid replication or with the faithful inheritance of plasmid copies during cell division. Cells that fail to retain the element can therefore produce colonies lacking plasmid-associated characteristics, creating material for downstream comparison with the starting strain.
Individual-colony isolation separates potential curing outcomes that arise within the treated bacterial population. Screening each colony for a plasmid-associated trait, such as antibiotic resistance, allows researchers to identify derivatives that no longer display that trait. This separation is important because a population-level result could conceal mixtures of cells that have retained the element and cells that have lost it.
Comparison with the original strain links plasmid loss to observable biological changes. If a derivative lacks a plasmid-associated trait and also differs in growth, virulence, metabolism, or resistance, the paired strains provide a framework for assessing the element’s contribution. The comparison is especially informative when the derivative and starting strain are examined using the same phenotype of interest.
Plasmids and other extrachromosomal genetic elements can carry traits that alter bacterial behavior, while horizontal gene transfer moves genetic information between bacteria. Producing derivatives that lack such elements lets researchers examine which phenotypes depend on acquired genetic material. The approach therefore connects mobile-element biology with genome stability and the persistence of resistance or other traits.
A basic workflow begins by growing bacteria on solid agar under conditions selected to interfere with plasmid replication or inheritance. Researchers then isolate individual colonies and screen them for loss of a plasmid-associated characteristic. Candidate plasmid-free derivatives are compared with the original strain to evaluate changes in the phenotype under investigation. These stages connect selection, verification, and biological interpretation.
Loss of a plasmid-associated trait, particularly antibiotic resistance, is a practical indicator that a colony may no longer carry the relevant element. The result identifies candidates for comparison with the parental strain, but its value depends on the trait being genuinely associated with the plasmid. Screening therefore serves as the bridge between colony isolation and phenotypic analysis.
Researchers can use these derivatives to examine whether extrachromosomal genetic elements influence bacterial growth, virulence, metabolism, or resistance. Comparing a plasmid-containing strain with a corresponding derivative helps assign observed differences to the presence or absence of the mobile element. This makes the method useful for investigating bacterial genetics, genome stability, and the biological consequences of horizontal gene transfer.