Red Light
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11:06
Daily Phototherapy with Red Light to Regulate Candida albicans Biofilm Growth
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Cited by 5 •
2019
Here, we present a protocol to assess the outcome of red light application on the growth of Candida albicans biofilm. A non-coherent red light device with the wavelength of 635 nm and energy density of 87.6 J·cm-2 was applied throughout the growth of Candida albicans biofilms for 48 h.
14:13
Atomic Force Microscopy of Red-Light Photoreceptors Using PeakForce Quantitative Nanomechanical Property Mapping
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Cited by 6 •
2014
A method for investigating the structure of a protein photoreceptor using atomic force microscopy (AFM) is described in this paper. PeakForce Quantitative Nanomechanical Property Mapping (PF-QNM) reveals intact protein dimers on a mica surface.
01:23
Red Algae
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2025
Red algae, also known as rhodophytes, are primarily found in marine environments, though some species inhabit freshwater and terrestrial ecosystems. These organisms exist in both unicellular and multicellular forms, with some multicellular varieties reaching macroscopic sizes.As phototrophic organisms, red algae contain chlorophyll a; however, their chloroplasts lack chlorophyll b. Instead, they possess phycobiliproteins, which serve as major light-harvesting pigments, similar to those found in...
01:35
Light as Energy
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2019
The energy required to carry out photosynthesis is light— typically electromagnetic radiation from the sun. The range of all possible wavelengths is known as the electromagnetic spectrum. Photons A photon is a discrete electromagnetic particle or bundle of energy. Photons are characterized by their frequency, wavelength, and amplitude, similar to the properties of a wave. Waves with higher frequencies transmit more energy and have shorter wavelengths than longer wavelengths that transmit less...
08:16
Method for the Assessment of Effects of a Range of Wavelengths and Intensities of Red/near-infrared Light Therapy on Oxidative Stress In Vitro
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Cited by 11 •
2015
Non-coherent Xenon light was passed through narrow-band interference and neutral density filters to deliver light of varying wavelength and intensity to cultured cells. This protocol was used to assess the effects of red/near-infrared light therapy on production of reactive species in vitro: no effects were observed using the tested parameters.
FAQs
In photosynthetic cells, chlorophyll absorbs red-light photons and uses that energy to excite electrons. The resulting excitation initiates energy transfer within the photosynthetic system, linking light absorption to the biochemical processes that support photosynthesis. Studying this interaction helps researchers examine how pigment activity connects incoming radiation with cellular energy processing.
Pigments and photoreceptors serve different biological roles, so their response to red light depends on how each system absorbs photons and converts that interaction into a consequence. In plants, chlorophyll channels absorbed energy toward photosynthesis. In light-sensitive animal systems, photoreceptors can initiate visual or other signaling responses, allowing the same spectral region to support distinct biological outcomes.
Absorption raises the molecule to an excited electronic state, creating an opportunity for energy transfer or biochemical signaling. The downstream result depends on the biological component involved and its cellular context. This sequence matters because it connects a physical light stimulus with changes in cellular activity, gene activity, or broader tissue responses.
Animal visual systems contain light-sensitive components that can respond when red-light photons interact with them. That interaction may initiate visual processing, while other light-sensitive systems can produce additional biological signaling. Consequently, red light can be studied not only as an illumination condition but also as a stimulus for examining how animal cells and organisms detect light.
A study can present red light to photosynthetic biological material and examine the resulting energy-transfer or biochemical response. Because chlorophyll captures this region of the spectrum, the approach focuses attention on the connection between photon absorption and photosynthetic activity. It is therefore useful for investigating how plant cells convert a light input into biological function.
Red-light experiments can address several questions beyond plant energy capture, including circadian regulation, cellular signaling, tissue responses, and animal light sensitivity. Researchers vary the biological context while treating red light as the relevant stimulus, then examine changes in activity or signaling. This broad application makes the topic useful across cellular, organismal, and comparative biology.