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Why does semen glow under UV light? 


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Semen glows under UV light due to the presence of certain compounds like proteins and enzymes that fluoresce when exposed to specific wavelengths of light. Research has shown that UV light sources emitting wavelengths between 415-490 nm are effective in detecting semen stains on various surfaces . The fluorescence of semen under UV light can aid in forensic investigations, particularly in cases of sexual assault, by helping in the identification and collection of evidence . Additionally, exposure to UV light, specifically UVC irradiation, can impact human sperm motility and induce lipid peroxidation in sperm membranes, affecting their viability . This phenomenon underscores the utility of UV light in forensic practices for detecting and analyzing semen stains.

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Semen glows under UV light due to components like fructose, proteins, and other substances in the ejaculate that fluoresce, aiding in its detection on fabrics in forensic investigations.
Semen glows under UV light due to longer wavelength frequencies (350 nm) causing luminescence in the visible blue light range, making it visible for detection in forensic investigations.
Semen glows under UV light due to its fluorescence properties, making it visible under certain wavelengths. However, the specific wavelengths for optimal detection and differentiation remain unclear in clinical practice.
Not addressed in the paper.

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