Regulation of Carbohydrate Breakdown of Chlorella Mutant No. 20, Studied by 31P NMR Spectroscopy and Enzymatic Analysis: 1. Regulation under Blue Light Conditions

1988 ◽  
Keyword(s):  
Nmr Spectroscopy ◽  
Blue Light ◽  
Enzymatic Analysis ◽  
Light Conditions

Influence of light on growth, conidiation and the mutual regulation of fumonisin B2 and ochratoxin A biosynthesis by Aspergillus niger

2012 ◽  
Vol 5 (2) ◽  
pp. 169-176 ◽  
Author(s):  
F. Fanelli ◽  
M. Schmidt-Heydt ◽  
M. Haidukowski ◽  
R. Geisen ◽  
A. Logrieco ◽  
...  
Keyword(s):  
Aspergillus Niger ◽  
Ochratoxin A ◽  
Blue Light ◽  
Short Wave ◽  
Light Conditions ◽  
Dark Incubation ◽  
Mutual Regulation ◽  
Blue Wavelength ◽  
Fumonisin B2 ◽  
Dark Production

Aspergillus niger is a fungus able to produce the carcinogenic mycotoxins ochratoxin A (OTA) and fumonisins. We analysed the influence of light of various wavelengths on growth, conidiation, fumonisin B2 (FB2) and OTA biosynthesis by A. niger ITEM 7097. Light from both sides of the spectrum, from long (627 nm) to short wavelengths (470-455 nm), had a stimulating effect on growth, with the highest stimulation under blue (455 nm, 1,700 Lux) and short-wave blue light (390 nm). Conidiation was reduced by 40% under a short blue wavelength (455 nm, 200 Lux), but strongly promoted under light at an even shorter wavelength (390 nm), with an increase of about 200 fold in comparison to the dark. Production of FB2 and OTA was mutually regulated by light. FB2 production was promoted under light conditions: red and blue light in particular increased FB2 biosynthesis by 40%. Conversely, OTA production was greatly inhibited under red and blue light in comparison to dark incubation, with a mean reduction of about 40 fold, indicating a reverse regulation of both biosynthetic pathways. Incubation under a 390 nm wavelength repressed the production of both toxins to non-detectable levels.

scholarly journals Interactive Effects of Light Quality and Temperature on Arabidopsis Growth and Immunity

2020 ◽  
Vol 61 (5) ◽  
pp. 933-941
Author(s):  
Xiaoying Liu ◽  
Chunmei Xue ◽  
Le Kong ◽  
Ruining Li ◽  
Zhigang Xu ◽  
...  
Keyword(s):  
Disease Resistance ◽  
Blue Light ◽  
Light Quality ◽  
Red Light ◽  
Complex Interaction ◽  
Hypocotyl Elongation ◽  
Interactive Effects ◽  
Phytochrome B ◽  
Light Conditions ◽  
Effects Of Temperature

Abstract We report here the interactive effects of three light qualities (white, red and blue) and three growth temperatures (16�C, 22�C and 28�C) on rosette growth, hypocotyl elongation and disease resistance in Arabidopsis thaliana. While an increase in temperature promotes hypocotyl elongation irrespective of light quality, the effects of temperature on rosette growth and disease resistance are dependent on light quality. Maximum rosette growth rate under white, red and blue light are observed at 28�C, 16�C and 22�C, respectively. The highest disease resistance is observed at 16�C under all three light conditions, but the highest susceptibility is observed at 28�C for white light and 22�C for red and blue light. Interestingly, rosette growth is inhibited by phytochrome B (PHYB) under blue light at 28�C and by cryptochromes (CRYs) under red light at 16�C. In addition, disease resistance is inhibited by PHYB under blue light and promoted by CRYs under red light. Therefore, this study reveals a complex interaction between light and temperature in modulating rosette growth and disease resistance as well as the contribution of PHYB and CRY to disease resistance.

scholarly journals Modeling Metropolitan-Area Ambulance Mobility Under Blue Light Conditions

IEEE Access ◽  
2019 ◽  
Vol 7 ◽  
pp. 1390-1403 ◽  
Author(s):  
Marcus Poulton ◽  
Anastasios Noulas ◽  
David Weston ◽  
George Roussos
Keyword(s):  
Blue Light ◽  
Metropolitan Area ◽  
Light Conditions

Signaling States of a Short Blue-Light Photoreceptor Protein PpSB1-LOV Revealed from Crystal Structures and Solution NMR Spectroscopy

2016 ◽  
Vol 428 (19) ◽  
pp. 3721-3736 ◽  
Author(s):  
Katrin Röllen ◽  
Joachim Granzin ◽  
Vineet Panwalkar ◽  
Vladimir Arinkin ◽  
Raj Rani ◽  
...  
Keyword(s):  
Nmr Spectroscopy ◽  
Crystal Structures ◽  
Blue Light ◽  
Solution Nmr ◽  
Blue Light Photoreceptor ◽  
Solution Nmr Spectroscopy

Growth requirements of blue-green algae under blue light conditions

1974 ◽  
Vol 97 (1) ◽  
pp. 303-312 ◽  
Author(s):  
Warren M. Pulich ◽  
Chase Van Baalen
Keyword(s):  
Blue Light ◽  
Green Algae ◽  
Light Conditions ◽  
Blue Green Algae ◽  
Growth Requirements

scholarly journals 0079 Blue Light Exposure Enhances Neural Efficiency of the Task Positive Network During a Cognitive Interference Task

SLEEP ◽  
2020 ◽  
Vol 43 (Supplement_1) ◽  
pp. A32-A32
Author(s):  
W D Killgore ◽  
N S Dailey ◽  
A C Raikes ◽  
J R Vanuk ◽  
E Taylor ◽  
...  
Keyword(s):  
Cognitive Performance ◽  
Blue Light ◽  
Performance Metrics ◽  
Light Exposure ◽  
Brain Activation ◽  
Light Conditions ◽  
Interference Task ◽  
Neural Efficiency ◽  
And Performance ◽  
Task Positive Network

Abstract Introduction Light exposure has powerful effects on the circadian timing of sleep and wake, primarily through the regulation of the secretion of melatonin. However, it is becoming clear that light has additional alerting effects beyond its primary effect on the circadian system. Exposure to light, particularly blue-wavelength light, has been shown to acutely increase brain activation, alertness, and some elementary aspects of cognitive performance such as working memory and emotional anticipation during the day. Whether blue light exposure can have longer-lasting effects on brain activation and performance during more complex cognitive control tasks up to 30-minutes after light cessation is unknown. Methods In a sample of 30 healthy adults, we examined the effects of a single 30-minute exposure to either blue (n=14) or amber placebo (n=16) light on subsequent brain activation and performance during the Multi-Source Interference Task (MSIT) measured a half-hour after light cessation using functional magnetic resonance imaging. Mean activation in all regions showing increased task-related activation (i.e., Task Positive Network; TPN) and regions showing decreased activation (i.e., Default Mode Network; DMN) at p<.001 (FWE corrected) was extracted separately for each network in SPM12 and compared between light conditions. Results Performance metrics for the MSIT, including accuracy, response time, and cognitive throughput, did not differ between the blue and amber conditions, suggesting that performance was sustained equally between light conditions. However, brain activation within the TPN to the interference condition of the MSIT was significantly lower (p=.024) in the blue relative to the amber condition, with no group differences observed for suppression of the DMN. Conclusion Compared to amber, a single exposure to blue light was associated with enhanced neural efficiency a half-hour later as demonstrated by reduced TPN activation to achieve the same level of cognitive performance. Blue light may be an effective method for optimizing neurocognitive performance under some conditions. Support US Army Medical Research and Materiel Command: W81XWH-14-1-0571

Blue light effect on EEG activity – The role of exposure timing and chronotype

2019 ◽  
Vol 52 (4) ◽  
pp. 472-484
Author(s):  
P Siemiginowska ◽  
I Iskra-Golec
Keyword(s):  
Individual Differences ◽  
Blue Light ◽  
White Light ◽  
Spectral Power ◽  
Young Male ◽  
Light Conditions ◽  
Light Effect ◽  
Eeg Activity ◽  
Mixed Analysis

There is growing evidence for monochromatic blue light effects. However, the role of individual differences in it has not yet been explored. The aim of this experiment was to examine whether chronotype could moderate the monochromatic blue light effect on electroencephalographic (EEG) activity with regard to the timing of exposure. The participants were 30 young male volunteers. A within-subjects counterbalanced design was applied. There were two light conditions comparable in luminance: Monochromatic blue light of 460 nm and polychromatic white light of 6.5 lux. EEG measurements were taken after 4 hours of exposure in the morning, afternoon, and evening. EEG spectral power was categorized into five frequency ranges: delta, theta, alpha1, alpha2, and beta. Chronotypes were assessed by the Morningness-Eveningness Questionnaire. A mixed analysis of variance was applied. Significant interactions between chronotype, light conditions, and the time of the day were found in theta and alpha1 bands after exposure to monochromatic blue light. These preliminary results indicated that in morning-oriented types the spectral power of theta and alpha1 EEG bands was higher in monochromatic blue light when compared to polychromatic white light in the afternoon hours than in the morning or the evening hours. These results may indicate a decrease in alertness in monochromatic blue light in the afternoon hours in morning-oriented types. This could point to the moderating role of individual differences in the monochromatic blue light effect.

Are retinal and retinal-binding proteins involved in stomatal response to blue light?

2005 ◽  
Vol 32 (12) ◽  
pp. 1135 ◽  
Author(s):  
Fabio Paolicchi ◽  
Lara Lombardi ◽  
Nello Ceccarelli ◽  
Roberto Lorenzi
Keyword(s):  
Blue Light ◽  
Binding Proteins ◽  
Higher Plants ◽  
Guard Cells ◽  
Stomatal Response ◽  
Light Conditions ◽  
Experimental Conditions ◽  
Light Responses ◽  
Commelina Communis ◽  
Retinal Binding Proteins

Stomata respond to blue light and it is generally believed that the photoreceptor for this response is located inside the guard cells. Only a small number of blue light photoreceptors have been identified so far, namely cryptochromes and phototropins, and they show overlapping functions in regulating many different responses to light. The possibility that plants may possess other receptors regulating blue light responses under different light conditions cannot be excluded. In this paper we show the presence of two retinal-binding proteins in Commelina communis and we report the identification of retinal, a chromophore usually bound to the photoreceptor rhodopsin and previously identified in algae and other higher plants. We show that, under our experimental conditions, stomata open promptly when exposed to blue light and we demonstrated that this response is dependent on retinal. We hypothesise that rhodopsin-like retinal-binding proteins might be involved in stomatal response to blue light.

scholarly journals EFFECT OF COLOUR

2014 ◽  
Vol 2 (3SE) ◽  
pp. 1-5
Author(s):  
Lucky Tonk
Keyword(s):  
Blue Light ◽  
Red Light ◽  
Web Design ◽  
Light Conditions ◽  
Emotional Factor

Colours can stimulate and excite people, increase their appetite, make them feel warm or make them feel tranquil. Red simply makes you excited according to those who study chromo dynamics. Coke’s website is red – it gives you a feel of a lazy, hot summer day – just when you feel the need to drink Coke.There’s more to colours in web design than just the emotional factor. People tend to gamble more under red light conditions than under blue light. Colours have impact on performance. Red lights make people act quicker and feel more powerful, which is not always beneficial, while blue makes people think more before acting. There is a reason STOP signs are red – you need to act right away and stop the vehicle you drive, otherwise you are in danger.

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