Microrespirometer
Microrespirometer - Related Videos
05:44
Cellular Respiration - Student Protocol
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2019
Quantifying Respiration using Microrespirometers ExpandNOTE: In this experiment, you will measure the rate of cellular respiration for germinating seeds by measuring the rate of exchange for oxygen. As oxygen is consumed to provide energy, germinating seeds release carbon dioxide. This carbon dioxide is absorbed by potassium carbonate and thus the overall gaseous pressure of the respirometer will be reduced. HYPOTHESES: The experimental hypothesis is that germinating seeds will show a greater...
03:06
Cellular Respiration - Instructor Prep
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2019
Quantifying Respiration using Microrespirometers ExpandTo assemble the microrespirometers needed for the lab, first plug in the hot glue gun to preheat it. Push the plunger of a tuberculin syringe all the way in and then cut the end off of the syringe. Next, insert a capillary tube into the empty needle end of the syringe. Push the capillary tube in until it touches the tip of the plunger. Use the hot glue gun to create an airtight seal between the capillary tube and the tuberculin syringe.
FAQs
Carbon dioxide absorption allows a microrespirometer to attribute a measured gas change primarily to oxygen uptake. In a sealed chamber, respiration can produce carbon dioxide, which would otherwise influence the signal. Removing it chemically helps isolate oxygen consumption and makes comparisons among samples or treatments more interpretable.
A microrespirometer can use a capillary, pressure sensor, or another sensitive transducer to detect respiratory changes. These devices translate a change in gas volume or pressure into a measurable signal, so investigators can quantify exchange from very small samples. The selected detector determines how the chamber’s response is recorded, not the biological process itself.
Temperature and experimental treatment are important comparison conditions because measurements can be collected under controlled settings. Holding these conditions consistent helps distinguish differences in metabolic rate between physiological states from differences caused by the environment. This design supports tests of energy demand, stress responses, drug effects, and environmental influences in biological samples.
A small biological sample is placed in a sealed microchamber with the chosen gas-detection system. If oxygen uptake is the target, carbon dioxide absorption can be included before recording the capillary or sensor response. Measurements are then made under a controlled temperature or treatment, allowing respiratory values to be compared across samples or conditions.
The approach is suited to insects, seeds, tissues, microorganisms, and isolated cells, especially when available material is limited. Resulting measurements can be used to compare metabolic rates and energy demands among sample types or physiological states. They also support investigations of how stress, drugs, or environmental conditions alter respiration.
In biology, the measurement connects gas exchange with cellular or organismal metabolism. A higher or lower respiratory signal can therefore serve as a quantitative indicator when comparing physiological states, treatments, or environmental conditions. Because the instrument works with tiny samples, it extends metabolic analysis to isolated cells and other material unsuitable for conventional respirometry.