Circadian rhythm and fast responses to blue light of photosynthesis in Ectocarpus (Phaeophyta, Ectocarpales)

Planta ◽  
1992 ◽  
Vol 187 (1) ◽  
pp. 53-59 ◽  
Author(s):  
Rainer Schmid ◽  
Matthew J. Dring
Keyword(s):  
Circadian Rhythm ◽  
Blue Light ◽  
Fast Responses

Circadian rhythm and fast responses to blue light of photosynthesis in Ectocarpus (Phaeophyta, Ectocarpales)

Planta ◽  
1992 ◽  
Vol 187 (1) ◽  
pp. 60-66 ◽  
Author(s):  
Rainer Schmid ◽  
Rodney Forster ◽  
Matthew J. Dring
Keyword(s):  
Circadian Rhythm ◽  
Blue Light ◽  
Fast Responses

Blue light disrupts the circadian rhythm and create damage in skin cells

2019 ◽  
Vol 41 (6) ◽  
pp. 558-562 ◽  
Author(s):  
K. Dong ◽  
E. C. Goyarts ◽  
E. Pelle ◽  
J. Trivero ◽  
N. Pernodet
Keyword(s):  
Circadian Rhythm ◽  
Blue Light ◽  
Skin Cells

Blue-light Filtering Intraocular Lenses

2012 ◽  
Vol 06 (02) ◽  
pp. 104 ◽  
Author(s):  
Sally Blackmore-Wright ◽  
Frank Eperjesi ◽  
◽  
Keyword(s):  
Circadian Rhythm ◽  
Blue Light ◽  
Colour Vision ◽  
Intraocular Lenses ◽  
Scotopic Vision ◽  
Eye Health

Blue-light filtering intraocular lenses are purported to reduce the incidence of potentially damaging UV and blue light on the retina. This article reviews their background, the proposed benefits on long-term eye health and the possible disadvantages on circadian rhythm, scotopic vision and colour vision.

scholarly journals Blue Light Therapy and the Circadian Rhythm: Effect on Southern California High School Students

2020 ◽  
Vol 9 (1) ◽  
Author(s):  
Aaron Hoy
Keyword(s):  
High School ◽  
Circadian Rhythm ◽  
High School Students ◽  
Sleep Quality ◽  
Blue Light ◽  
Seasonal Affective Disorder ◽  
Light Therapy ◽  
Patient Experiences ◽  
School Students ◽  
Positive Results

Blue-light therapy is well known for curing patients with Seasonal Affective Disorder (SAD), where the patient experiences depressive factors. In this study I used blue-light therapy in the form of blue-light lightboxes from the comapny Circadian Optics, as seen on shark tank. Instead of using the lightboxes to cure SAD, they were instead used to see if they provoked the participants sleep quality. The participants from Polytechnic highschool were selected from the Badminton Team, where the athletes woke up at five a.m. on school days. This ensured that the crowd was overall tired and fatigued. Over the four week testing course, participants proved positive results.

scholarly journals 1399 Blue light disrupts circadian rhythm at night causing direct effects on skin cells

2018 ◽  
Vol 138 (5) ◽  
pp. S237
Author(s):  
K. Dong ◽  
E. Goyarts ◽  
E. Pelle ◽  
N. Pernodet
Keyword(s):  
Circadian Rhythm ◽  
Blue Light ◽  
Direct Effects ◽  
Skin Cells

scholarly journals Preliminary Results: The Impact of Smartphone Use and Short-Wavelength Light during the Evening on Circadian Rhythm, Sleep and Alertness

2021 ◽  
Vol 3 (1) ◽  
pp. 66-86
Author(s):  
Christopher Höhn ◽  
Sarah R. Schmid ◽  
Christina P. Plamberger ◽  
Kathrin Bothe ◽  
Monika Angerer ◽  
...  
Keyword(s):  
Circadian Rhythm ◽  
Blue Light ◽  
Short Wavelength ◽  
Light Filter ◽  
Negative Effects ◽  
Sleep Physiology ◽  
Short Wavelength Light ◽  
Blue Light Filter ◽  
The Impact ◽  
Wavelength Light

Smartphone usage strongly increased in the last decade, especially before bedtime. There is growing evidence that short-wavelength light affects hormonal secretion, thermoregulation, sleep and alertness. Whether blue light filters can attenuate these negative effects is still not clear. Therefore, here, we present preliminary data of 14 male participants (21.93 ± 2.17 years), who spent three nights in the sleep laboratory, reading 90 min either on a smartphone (1) with or (2) without a blue light filter, or (3) on printed material before bedtime. Subjective sleepiness was decreased during reading on a smartphone, but no effects were present on evening objective alertness in a GO/NOGO task. Cortisol was elevated in the morning after reading on the smartphone without a filter, which resulted in a reduced cortisol awakening response. Evening melatonin and nightly vasodilation (i.e., distal-proximal skin temperature gradient) were increased after reading on printed material. Early slow wave sleep/activity and objective alertness in the morning were only reduced after reading without a filter. These results indicate that short-wavelength light affects not only circadian rhythm and evening sleepiness but causes further effects on sleep physiology and alertness in the morning. Using a blue light filter in the evening partially reduces these negative effects.

BLR-1 and BLR-2, key regulatory elements of photoconidiation and mycelial growth in Trichoderma atroviride

Microbiology ◽  
2004 ◽  
Vol 150 (11) ◽  
pp. 3561-3569 ◽  
Author(s):  
Sergio Casas-Flores ◽  
Mauricio Rios-Momberg ◽  
Martha Bibbins ◽  
Patricia Ponce-Noyola ◽  
Alfredo Herrera-Estrella
Keyword(s):  
Biological Control ◽  
Circadian Rhythm ◽  
Blue Light ◽  
Mycelial Growth ◽  
White Collar ◽  
Regulatory Elements ◽  
Trichoderma Atroviride ◽  
Reproductive Structures ◽  
Light Receptor ◽  
Encoding Gene

In fungi, phototropism, the induction of carotenogenesis and reproductive structures, and resetting of the circadian rhythm are controlled by blue light. Trichoderma atroviride, a fungus used in biological control, sporulates in a synchronized manner following a brief pulse of blue light. Due to its apparent simplicity, this response was chosen for pursuing photoreceptor isolation. Two genes were cloned, blue-light regulators 1 and 2 (blr-1 and blr-2), similar to the Neurospora crassa white-collar 1 and 2, respectively. The BLR-1 protein has all the characteristics of a blue-light photoreceptor, whereas the structure of the deduced BLR-2 protein suggests that it interacts with BLR-1 through PAS domains to form a complex. Disruption of the corresponding genes demonstrated that they are essential for blue-light-induced conidiation. blr-1 and blr-2 were also shown to be essential for the light-induced expression of the photolyase-encoding gene (phr-1). Mechanical injury of mycelia was found to trigger conidiation of T. atroviride, a response not described previously. This response was not altered in the mutants. A novel effect of both red and blue light on mycelial growth was found involving another light receptor, which is compensated by the BLR proteins.

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