Heat Plate Assay
Heat Plate Assay - Related Videos
02:38
Local Heat Probe Assay: A Method to Assess Nociception of High Temperatures in Drosophila Larvae
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2023
Drosophila larvae have dedicated sensory neurons–nociceptors–whose response to potentially harmful thermal stimuli triggers aversive–or so-called "nocifensive"–behaviors in the animal. This video describes a method to assess thermal nociception by recording larval behavior in response to local application of a heat probe onto the cuticle. This method is, therefore, called the local heat probe assay.
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A Peg Plate Biofilm Assay for Screening Antibacterial Agents
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02:46
Quantifying Heat
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2025
Thermal Energy Microscopically, thermal energy is the kinetic energy associated with the random motion of atoms and molecules. Temperature is a quantitative measure of “hot” or “cold”, which depends on the amount of thermal energy. When the atoms and molecules in an object are moving or vibrating quickly, they have a higher average kinetic energy (KE) (or higher thermal energy), and the object is perceived as “hot”, or it is described as being at a higher temperature. When the atoms and...
01:12
Heat Flow and Specific Heat
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2023
Heat is a type of energy transfer that is caused by a temperature difference, and it can change the temperature of an object. Since heat is a form of energy, its SI unit is the joule (J). Another common unit of energy often used for heat is the calorie (cal), which is defined as the energy needed to change the temperature of 1 g of water by 1 °C, specifically between 14.5 °C and 15.5 °C, since the energy needed shows a slight temperature dependence. Another commonly used unit is the kilocalorie...
01:16
Specific Heat
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2019
The specific heat capacity of a substance refers to the energy required to increase the temperature of one gram of that substance by one degree Celcius. Specific heat capacity is often represented in calories (cal), grams (g), and degrees Celsius (oC), but can also be expressed in joules (J), kilograms (kg), and Kelvin (K), among other units. For example, increasing the temperature of one gram of water by 1°C requires one calorie of heat energy and can be written as 1 cal/g-°C, or 4186 J/kg/K.
FAQs
The assay uses response latency as its primary quantitative variable. Paw withdrawal, licking, or jumping indicates that the animal has reacted to noxious heat, while the elapsed time before that response reflects integrated thermal nociception. Comparing latencies across conditions allows researchers to identify treatment-related changes without relying solely on subjective behavioral judgments.
A preset cutoff limits how long the animal remains exposed to the heated surface if no response occurs. This safeguard helps prevent tissue injury while preserving a measurable behavioral endpoint. Because the cutoff constrains maximum latency, researchers must interpret unusually long responses within that limit rather than treating them as unlimited evidence of reduced pain sensitivity.
Analgesic effects are evaluated by comparing post-treatment response latencies with baseline measurements and appropriate control groups. A treatment-associated increase in latency suggests reduced responsiveness to the thermal stimulus, provided the comparison is made under the same assay conditions. This approach supports quantitative evaluation of candidate pain-relieving effects rather than relying on a single animal or time point.
Interpretation depends on separating responses to heat from general movement capacity. The assay records recognizable escape-related behaviors, but a change in latency may reflect altered thermal sensitivity or broader motor impairment. Researchers therefore use the pattern of behavioral outcomes and comparisons with controls to determine whether an apparent analgesic effect is specific to nociception or associated with reduced ability to respond.
Researchers first place the animal on a temperature-controlled heated plate, observe its responses to the thermal stimulus, and record the latency to paw withdrawal, licking, or jumping. Exposure ends when the defined response occurs or the preset cutoff is reached. Baseline and control measurements provide the reference needed to interpret later changes after treatment.
The assay is useful when investigators need a quantitative behavioral measure of responses to noxious heat. In pharmacology, it supports evaluation of analgesic candidates and comparison of treatment effects with controls. In neuroscience, it helps investigate pain pathways and thermal sensitivity, while the behavioral design also allows researchers to consider whether observed changes reflect motor impairment.