Biological Activity
Biological Activity - Related Videos
00:03
Measurement of Chitinase Activity in Biological Samples
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Cited by 6 •
2019
Presented here is a simple method to measure chitinase activity in biological fluids such as bronchoalveolar lavage or serum.
10:31
Assessment of Waste-Derived Biochars on the Health and Biological Activity of Soil
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2025
Here we evaluate the effects of waste-derived biochars from coffee grounds, spent hops, spruce wood, and cigarette butts on soil health, assessing microbial activity, plant growth, and potential invertebrate ecotoxicity.
02:59
Biological Effects of Radiation
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2020
All radioactive nuclides emit high-energy particles or electromagnetic waves. When this radiation encounters living cells, it can cause heating, break chemical bonds, or ionize molecules. The most serious biological damage results when these radioactive emissions fragment or ionize molecules. For example, α and β particles emitted from nuclear decay reactions possess much higher energies than ordinary chemical bond energies. When these particles strike and penetrate matter, they produce ions...
07:28
Synthetic Biology
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2023
This video presents synthetic biology and its role in bioengineering. Synthetic biology refers to the methods used to genetically modify organisms in order to make them capable of producing large quantities of a product. This product could be a protein that the cell already makes or a new protein that has been encoded in a newly-inserted DNA sequence. Here, we discuss how an organism's genetic material is modified using transformation or transfection. Then, the process is shown in the...
01:57
What is Conservation Biology?
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2019
Conservation biology is a scientific field that focuses on the preservation of biodiversity in order to protect ecosystems while meeting the needs of the human population. Humans require properly functioning ecosystems to maintain our supply of natural resources, including food, medicines, and building materials. Ecosystems also perform critical services, such as purifying our air and water. A large body of evidence indicates that such ecosystem services depend on biodiversity. Furthermore,...
FAQs
These processes change molecular or physiological states through different routes. Enzymes alter biochemical reactions, receptors transmit signals after binding specific substances, and gene expression changes the production of cellular components. Metabolism also modifies the cell’s chemical state. Because each mechanism produces characteristic changes, researchers can select measurements that reflect the biological process under investigation.
Biological activity occurs under specific conditions, so the observed effect depends on the cellular or molecular context in which it is measured. A change in cell growth, viability, a biochemical reaction, or gene expression may reflect activity only within that defined system. Controlling and reporting those conditions helps researchers interpret measurements and compare biological effects.
Researchers compare how each substance changes a selected biological response, such as cell viability, growth, biochemical activity, or gene expression. The resulting pattern provides functional information that complements the substance’s chemical identity. This approach can reveal whether a material produces a desired response, disrupts normal cellular behavior, or has effects relevant to therapeutic efficacy or safety.
A typical workflow selects a biological system and a measurable response, exposes the system to the substance or material being studied, and records the resulting change. Common readouts include cell growth, cell viability, biochemical reactions, and gene expression. Researchers then use the measured response to characterize the substance or compare its effects under defined conditions.
The choice depends on the biological response that needs to be characterized. Cell-based measurements can monitor outcomes such as growth, viability, or gene expression, whereas biochemical assays can follow a reaction more directly. Both approaches measure biological effects, but they provide different views of how a hormone, drug, toxin, protein, microorganism, or natural product acts.
Measurements of activity help determine whether a drug produces a relevant biological response and whether that response supports further investigation. Assays can monitor cellular or biochemical changes associated with efficacy, while related measurements can identify effects relevant to safety. This information guides drug discovery and contributes to evaluating therapeutic performance in biological systems.
In environmental testing, activity measurements help evaluate the effects of toxins and other biologically derived substances on living systems. In biotechnology, the same general strategy supports characterization of proteins, microorganisms, and natural products. By tracking changes in cellular, biochemical, or gene-expression readouts, researchers obtain functional information useful for development and assessment.