Growth Controls
Growth Controls - Related Videos
01:29
Methods for Controlling Microbial Growth
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2025
Microbial growth control refers to various methods employed to inhibit, reduce, or eliminate microorganisms to ensure safety and hygiene across different settings. These methods are categorized based on the target environment and the level of microbial control required.Biocides are versatile agents designed to control microorganisms by either inhibiting their growth or outright killing them. These agents work through various physical, chemical, mechanical, or biological mechanisms. The...
01:23
Physical Methods for Controlling Microbial Growth: Temperature
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2025
Heat is a widely used method to control microbial growth by targeting and denaturing cellular proteins, thereby killing or inactivating microbes. This method's effectiveness is quantified using parameters such as the thermal death point (TDP), thermal death time (TDT), and decimal reduction time (D value). TDP represents the lowest temperature at which all microorganisms in a liquid suspension are eliminated within 10 minutes, whereas TDT is the time necessary to achieve sterilization at a...
01:26
Physical Methods for Controlling Microbial Growth: Radiation and Filtration
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2025
Radiation and filtration are essential tools for microbial control, targeting microorganisms through distinct mechanisms. Radiation eliminates microbes by damaging their DNA, either killing them or inhibiting their growth. Based on wavelength, radiation is classified into two types: nonionizing and ionizing radiation.Non-ionizing radiation, such as UV radiation (200–400 nm), is absorbed by DNA, causing defects that effectively disinfect surfaces, air, and water, including safety cabinets.
06:44
Tuning Oxide Properties by Oxygen Vacancy Control During Growth and Annealing
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Cited by 1 •
2023
Oxide materials show many exotic properties that can be controlled by tuning the oxygen content. Here, we demonstrate the tuning of oxygen content in oxides by varying the pulsed laser deposition parameters and by performing postannealing. As an example, electronic properties of SrTiO3-based heterostructures are tuned by growth modifications and annealing.
07:40
A Gusseted Thermogradient Table to Control Soil Temperatures for Evaluating Plant Growth and Monitoring Soil Processes
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Cited by 5 •
2016
Traditional thermogradient tables create a range of temperatures across the surface. Welding gussets perpendicular to the surface of a thermogradient table will control temperature in depth increasing possible research applications.
FAQs
A positive control shows that the experimental environment can support proliferation, not merely that nutrients are present. Viable organisms exposed to suitable nutrients, temperature, and other required culture conditions provide the reference response against which treated or immune-exposed samples can be judged. If this reference fails, apparent growth inhibition cannot be confidently attributed to the intervention.
Negative controls address a different interpretive problem: signal that appears without the intended organism or growth response. They help reveal contamination or background signal, allowing investigators to separate experimental microbial growth from unwanted contributions. Including them alongside positive controls strengthens confidence that a measured change reflects the tested condition rather than an artifact of the assay.
Growth controls help distinguish two explanations for a low microbial signal: true suppression and an assay that could not support growth. Comparison with the positive reference establishes whether the culture system performed as expected, while the negative reference indicates whether contamination or background affected the readout. This distinction is essential when interpreting inhibition in infection experiments.
An experiment using Growth Controls should include reference samples under the defined culture conditions, with viable organisms and the nutrients, temperature, and other requirements needed for proliferation. Negative-control samples should also be included to assess contamination or background signal. The resulting reference responses are then compared with experimental samples before drawing conclusions about growth or inhibition.
In antimicrobial susceptibility testing, the controls provide the baseline needed to decide whether reduced growth is associated with the antimicrobial condition rather than failed culture. The same logic applies when testing immune-mediated pathogen control: investigators can compare pathogen growth in experimental conditions with the expected growth response. This makes control performance central to interpreting susceptibility and immune effects.
When infection studies measure changes in microbial burden, controls help anchor the meaning of those changes. A decrease relative to the appropriate growth reference can be evaluated as evidence of altered proliferation, provided the culture system remained functional and background was assessed. This improves reliability when comparing conditions and supports clearer conclusions about pathogen control.