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Wong KY, Fernandez FX. Circadian Responses to Light-Flash Exposure: Conceptualization and New Data Guiding Future Directions. Front Neurol 2021; 12:627550. [PMID: 33643205 PMCID: PMC7905211 DOI: 10.3389/fneur.2021.627550] [Citation(s) in RCA: 6] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/09/2020] [Accepted: 01/21/2021] [Indexed: 01/03/2023] Open
Abstract
A growing number of studies document circadian phase-shifting after exposure to millisecond light flashes. When strung together by intervening periods of darkness, these stimuli evoke pacemaker responses rivaling or outmatching those created by steady luminance, suggesting that the circadian system's relationship to light can be contextualized outside the principle of simple dose-dependence. In the current review, we present a brief chronology of this work. We then develop a conceptual model around it that attempts to relate the circadian effects of flashes to a natural integrative process the pacemaker uses to intermittently sample the photic information available at dawn and dusk. Presumably, these snapshots are employed as building blocks in the construction of a coherent representation of twilight the pacemaker consults to orient the next day's physiology (in that way, flash-resetting of pacemaker rhythms might be less an example of a circadian visual illusion and more an example of the kinds of gestalt inferences that the image-forming system routinely makes when identifying objects within the visual field; i.e., closure). We conclude our review with a discussion on the role of cones in the pacemaker's twilight predictions, providing new electrophysiological data suggesting that classical photoreceptors—but not melanopsin—are necessary for millisecond, intermediate-intensity flash responses in ipRGCs (intrinsically photosensitive retinal ganglion cells). Future investigations are necessary to confirm this “Cone Sentinel Model” of circadian flash-integration and twilight-prediction, and to further define the contribution of cones vs. rods in transducing pacemaker flash signals.
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Affiliation(s)
- Kwoon Y Wong
- Department of Molecular, Cellular, & Developmental Biology, University of Michigan, Ann Arbor, MI, United States.,Department of Ophthalmology & Visual Sciences, University of Michigan, Ann Arbor, MI, United States
| | - Fabian-Xosé Fernandez
- Department of Psychology, BIO5 Research Institute, University of Arizona, Tucson, AZ, United States.,Department of Neurology, McKnight Brain Research Institute, University of Arizona, Tucson, AZ, United States
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Cao S, Han T, Li Q, Peng L, Zhao C, Tang Y, Xu J. Tunable spectrum resemblance of LED lights for improving the photosynthetic action of Chinese Cabbages. LIFE SCIENCES IN SPACE RESEARCH 2020; 26:28-33. [PMID: 32718684 DOI: 10.1016/j.lssr.2020.03.009] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/12/2019] [Revised: 03/24/2020] [Accepted: 03/25/2020] [Indexed: 06/11/2023]
Abstract
To increase efficiency, and reduce energy loss and waste, we propose to improve the photosynthetic action spectrum resemblance (SRPAS) of LED light with the absorption spectra of the fresh leaf, for accelerating the growth of Chinese Cabbages. Eight spectral LED lights were adopted to irradiate Chinese Cabbages under 150 μmol•m-2 s-1 for a 16 hd-1 photoperiod. Of these, under the irradiation of blue + broad red + more yellow (BRY2) light with high spectrum resemblance of 75%, the fresh weight and dry weight are 5.1times and 3.0 times, respectively, and the leaf area and leaf number are 1.7 times, as high as under the blue light. The results demonstrate that the optimized LED light can be presumed to have the highest spectrum resemblance (SRPAS) with the absorption spectra of Chinese Cabbages, and the highest energy-conversion efficiency. These conclusions may be of great benefit to further assess and find either an ideal light applied for plant growth or design of better light sources for growing different plants.
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Affiliation(s)
- Shixiu Cao
- Research Institute for New Materials Technology, Chongqing University of Arts and Sciences, Chongqing 402160, People's Republic of China
| | - Tao Han
- Research Institute for New Materials Technology, Chongqing University of Arts and Sciences, Chongqing 402160, People's Republic of China.
| | - Qiang Li
- Research Institute for New Materials Technology, Chongqing University of Arts and Sciences, Chongqing 402160, People's Republic of China
| | - Lingling Peng
- Research Institute for New Materials Technology, Chongqing University of Arts and Sciences, Chongqing 402160, People's Republic of China
| | - Cong Zhao
- Research Institute for New Materials Technology, Chongqing University of Arts and Sciences, Chongqing 402160, People's Republic of China
| | - Yinyin Tang
- Research Institute for New Materials Technology, Chongqing University of Arts and Sciences, Chongqing 402160, People's Republic of China
| | - Jing Xu
- Research Institute for New Materials Technology, Chongqing University of Arts and Sciences, Chongqing 402160, People's Republic of China
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Xia M, Zhang Y, Li M, Zhong Y, Gu S, Zhou N, Zhou Z. High thermal stability and blue-violet emitting phosphor CaYAlO4:Ti4+ with enhanced emission by Ca2+ vacancies. J RARE EARTH 2020. [DOI: 10.1016/j.jre.2019.04.015] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/26/2022]
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Mukherjee S, Thilagar P. Renaissance of Organic Triboluminescent Materials. Angew Chem Int Ed Engl 2019; 58:7922-7932. [DOI: 10.1002/anie.201811542] [Citation(s) in RCA: 57] [Impact Index Per Article: 11.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/08/2018] [Indexed: 02/05/2023]
Affiliation(s)
- Sanjoy Mukherjee
- Mitsubishi Chemicals Center for Advanced Materials University of California Santa Barbara CA 93106 USA
| | - Pakkirisamy Thilagar
- Department of Inorganic and Physical Chemistry Indian Institute of Science Bangalore 560012 India
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Affiliation(s)
- Sanjoy Mukherjee
- Mitsubishi Chemicals Center for Advanced Materials University of California Santa Barbara CA 93106 USA
| | - Pakkirisamy Thilagar
- Department of Inorganic and Physical Chemistry Indian Institute of Science Bangalore 560012 India
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Wu T, Lin Y, Zheng L, Guo Z, Xu J, Liang S, Liu Z, Lu Y, Shih TM, Chen Z. Analyses of multi-color plant-growth light sources in achieving maximum photosynthesis efficiencies with enhanced color qualities. OPTICS EXPRESS 2018; 26:4135-4147. [PMID: 29475266 DOI: 10.1364/oe.26.004135] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/14/2017] [Accepted: 02/05/2018] [Indexed: 06/08/2023]
Abstract
An optimal design of light-emitting diode (LED) lighting that benefits both the photosynthesis performance for plants and the visional health for human eyes has drawn considerable attention. In the present study, we have developed a multi-color driving algorithm that serves as a liaison between desired spectral power distributions and pulse-width-modulation duty cycles. With the aid of this algorithm, our multi-color plant-growth light sources can optimize correlated-color temperature (CCT) and color rendering index (CRI) such that photosynthetic luminous efficacy of radiation (PLER) is maximized regardless of the number of LEDs and the type of photosynthetic action spectrum (PAS). In order to illustrate the accuracies of the proposed algorithm and the practicalities of our plant-growth light sources, we choose six color LEDs and German PAS for experiments. Finally, our study can help provide a useful guide to improve light qualities in plant factories, in which long-term co-inhabitance of plants and human beings is required.
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Han T, Vaganov V, Cao S, Li Q, Ling L, Cheng X, Peng L, Zhang C, Yakovlev AN, Zhong Y, Tu M. Improving "color rendering" of LED lighting for the growth of lettuce. Sci Rep 2017; 7:45944. [PMID: 28368019 PMCID: PMC5377472 DOI: 10.1038/srep45944] [Citation(s) in RCA: 52] [Impact Index Per Article: 7.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/24/2017] [Accepted: 03/07/2017] [Indexed: 11/25/2022] Open
Abstract
Light plays a vital role on the growth and development of plant. On the base of white light with high color rendering to the benefit of human survival and life, we proposed to improve "color rendering" of LED lighting for accelerating the growth of lettuce. Seven spectral LED lights were adopted to irradiate the lettuces under 150 μmol·m-2·s-1 for a 16 hd-1 photoperiod. The leaf area and number profiles, plant biomass, and photosynthetic rate under the as-prepared LED light treatments were investigated. We let the absorption spectrum of fresh leaf be the emission spectrum of ideal light and then evaluate the "color rendering" of as-prepared LED lights by the Pearson product-moment correlation coefficient and CIE chromaticity coordinates. Under the irradiation of red-yellow-blue light with high correlation coefficient of 0.587, the dry weights and leaf growth rate are 2-3 times as high as the sharp red-blue light. The optimized LED light for lettuce growth can be presumed to be limited to the angle (about 75°) between the vectors passed through the ideal light in the CIE chromaticity coordinates. These findings open up a new idea to assess and find the optimized LED light for plant growth.
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Affiliation(s)
- Tao Han
- Chongqing Engineering Research Center for Optoelectronic Materials and Devices, Research Institute for New Materials Technology, Chongqing University of Arts and Sciences, Chongqing 402160, People’s Republic of China
| | - Vitaliy Vaganov
- Institute of High Technology Physics, Tomsk Polytechnic University, Tomsk 634050, Russia
| | - Shixiu Cao
- Chongqing Engineering Research Center for Optoelectronic Materials and Devices, Research Institute for New Materials Technology, Chongqing University of Arts and Sciences, Chongqing 402160, People’s Republic of China
| | - Qiang Li
- Chongqing Engineering Research Center for Optoelectronic Materials and Devices, Research Institute for New Materials Technology, Chongqing University of Arts and Sciences, Chongqing 402160, People’s Republic of China
| | - Lili Ling
- Citrus Research Institute, Southwest University, Chongqing 400712, People’s Republic of China
| | - Xiaoyao Cheng
- Chongqing Engineering Research Center for Optoelectronic Materials and Devices, Research Institute for New Materials Technology, Chongqing University of Arts and Sciences, Chongqing 402160, People’s Republic of China
| | - Lingling Peng
- Chongqing Engineering Research Center for Optoelectronic Materials and Devices, Research Institute for New Materials Technology, Chongqing University of Arts and Sciences, Chongqing 402160, People’s Republic of China
| | - Congzhi Zhang
- Chongqing Engineering Research Center for Optoelectronic Materials and Devices, Research Institute for New Materials Technology, Chongqing University of Arts and Sciences, Chongqing 402160, People’s Republic of China
| | - Alexey N. Yakovlev
- Institute of High Technology Physics, Tomsk Polytechnic University, Tomsk 634050, Russia
| | - Yang Zhong
- Institute of High Technology Physics, Tomsk Polytechnic University, Tomsk 634050, Russia
| | - Mingjing Tu
- Chongqing Engineering Research Center for Optoelectronic Materials and Devices, Research Institute for New Materials Technology, Chongqing University of Arts and Sciences, Chongqing 402160, People’s Republic of China
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