Light Attenuation Estimation
Light Attenuation Estimation - Related Videos
02:42
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Transcriptional attenuation occurs when RNA transcription is prematurely terminated due to the formation of a terminator mRNA hairpin structure. Bacteria use these hairpins to regulate the transcription process and control the synthesis of several amino acids including histidine, lysine, threonine, and phenylalanine. Transcription attenuation takes place in the non-coding regions of mRNA. There are several different mechanisms used to attenuate transcription. In ribosome mediated...
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Signal Attenuation as a Rat Model of Obsessive Compulsive Disorder
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Cited by 3 •
2015
The goal of the protocol described in this paper is to induce compulsive-like behavior in rats for the study of obsessive-compulsive disorder (OCD). This behavior is precipitated by attenuating a signal indicating that a lever-press response was effective in producing food.
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2023
It isn't easy to measure a parameter such as the mean height or the mean weight of a population. So, we draw samples from the population and calculate the mean height or mean weight of the individuals in the sample. This sample data acts as a representative measure of the population parameter. These sample statistics are known as estimates. The estimate for the mean of a sample is denoted by ͞x, whereas the mean of the population is designated as μ. Further, parameters such as the mean,...
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The Precision of Visual Working Memory with Delayed Estimation
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2023
Source: Laboratory of Jonathan Flombaum—Johns Hopkins University Human memory is limited. Throughout most of its history, experimental psychology has focused on investigating the discrete, quantitative limits of memory—how many individual pieces of information a person can remember. Recently, experimental psychologists have also become interested in more qualitative limits—how precisely is information stored? The concept of memory precision can be both intuitive and elusive at once. It is...
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Intradermal Immunization with Live Attenuated Sporozoites in a Mouse Model
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This video demonstrates an assay for immunizing a mouse model with live attenuated sporozoites. The radiation-attenuated Plasmodium sporozoites are injected into the dorsal side of the mouse's ear. After injections at multiple locations on both ears, the mouse is allowed to recover.
FAQs
Light loss in an environmental medium reflects two main processes: absorption removes light energy, while scattering redirects it away from the measurement path. Their combined effect determines how rapidly irradiance declines with distance. Separating these processes may not be possible from a basic attenuation estimate alone, but recognizing both mechanisms helps researchers interpret changes in water clarity, atmospheric visibility, or light availability.
The distance light travels provides the scale for relating incident and transmitted irradiance to an attenuation coefficient. A given intensity change can represent different attenuation behavior over short and long paths, so distance must be considered when comparing measurements. This relationship also supports estimates of how deeply light can penetrate a medium before becoming limited for environmental processes such as photosynthesis.
The surrounding medium determines which environmental conditions the estimate describes and how reduced light should be interpreted. In water, it can indicate clarity and the influence of suspended or dissolved material; in air, it relates to visibility; and in soil or vegetation, it describes light availability within the material. Comparing media therefore requires attention to the specific environmental context.
A basic calculation requires incident irradiance, transmitted irradiance, and the distance traveled through the medium. Comparing the two intensity measurements identifies the amount of light lost, while incorporating path length produces an attenuation coefficient. The resulting value can then be used to describe transmission conditions or compare light availability across environmental samples, locations, or depths.
Researchers apply attenuation estimates when they need to characterize water clarity, suspended particles, dissolved substances, atmospheric visibility, or light penetration through environmental materials. The measurements can support ecological monitoring and assessment of environmental change. In aquatic studies, they also help evaluate the depth range where sufficient light remains available for photosynthesis and related productivity investigations.
In aquatic productivity studies, attenuation information indicates how light availability changes with depth, helping relate underwater conditions to photosynthetic potential. For remote sensing and ecological monitoring, the estimate provides a way to characterize changes in transmission through environmental media. These applications connect measured irradiance loss with broader observations of water conditions, environmental status, and changing ecosystems.