Squarylium dye and onium salts as highly sensitive photoradical generators for blue light

2017 ◽  
Vol 8 (22) ◽  
pp. 3464-3474 ◽  
Author(s):  
Katarzyna Kostrzewska ◽  
Joanna Ortyl ◽  
Robert Dobosz ◽  
Janina Kabatc
Keyword(s):  
Blue Light ◽  
Onium Salts ◽  
Highly Sensitive ◽  
Squarylium Dye

2-Ethyl-2-(hydroxymethyl)-1,3-propanediol triacrylate was polymerized in the presence of squarylium dye and various onium salts.

Highly sensitive NO2 optical detector with squarylium dye Langmuir-Blodgett film containing J aggregate

1989 ◽  
Vol 180 (1-2) ◽  
pp. 193-198 ◽  
Author(s):  
Makoto Furuki ◽  
Kentaro Ageishi ◽  
Suk Kim ◽  
Itsuro Ando ◽  
Lyong Sun Pu
Keyword(s):  
Blodgett Film ◽  
Langmuir Blodgett ◽  
Optical Detector ◽  
Highly Sensitive ◽  
Squarylium Dye ◽  
Langmuir Blodgett Film

scholarly journals Effect of Blue Light and Photosensitizers on Cutibacterium acnes on Shoulder Periprosthetic Joint Infection Isolates

2020 ◽  
Vol 5 (4) ◽  
pp. 187-197
Author(s):  
Swati Bhargava ◽  
Thomas Listopadzki ◽  
Sara Diletti ◽  
John K. Crane ◽  
Thomas R. Duquin ◽  
...  
Keyword(s):  
Antimicrobial Activity ◽  
Photodynamic Therapy ◽  
Blue Light ◽  
Periprosthetic Joint Infection ◽  
Acne Vulgaris ◽  
Joint Infection ◽  
Prosthetic Joint ◽  
Highly Sensitive ◽  
Cutibacterium Acnes

Abstract. Introduction: Cutibacterium acnes is gaining recognition as a leading pathogen after orthopaedic shoulder procedures. Photodynamic therapy, a combination of light and a photosensitizer, has demonstrated antimicrobial activity against C. acnes in the treatment of acne vulgaris. We sought to evaluate the effect of photodynamic therapy using blue light and photosensitizers on C. acnes isolates from shoulder prosthetic joint infections.Methods: C. acnes strains isolated from 19 patients with shoulder PJI were exposed to blue light alone (415 nm) or in combination with photosensitizers (fluorescein, riboflavin and demeclocycline). C. acnes strains were divided into 4 categories: Highly Sensitive (HS), Sensitive (S), Weakly Sensitive (WS), Resistant to blue light.Results: 13 of 19 C. acnes strains (68%) were S or HS to blue light alone. Of these 19 strains tested, 11 were tested with blue light and fluorescein or blue light plus riboflavin. Fluorescein (1 µg/mL) enhanced the effect of blue light in 6 of 11 strains (55%). Blue light plus riboflavin (10 µg/mL) resulted enhanced killing in 3 of 11 strains (27%), but produced a paradoxical photoprotective effect in 4 of 11 strains (36%), resulting in a net decrease compared to blue light alone. Demeclocycline, however, enhanced the effect of blue light in 16 of 17 strains (94 %).Conclusions: Blue light with the addition of photosensitizers killed C. acnes from periprosthetic shoulder infections in vitro, with demeclocycline having the most pronounced effect.

scholarly journals In search of blue-light effects on cognitive control

2021 ◽  
Vol 11 (1) ◽  
Author(s):  
Hsing-Hao Lee ◽  
Yun-Chen Tu ◽  
Su-Ling Yeh
Keyword(s):  
Cognitive Control ◽  
Retinal Ganglion Cells ◽  
Blue Light ◽  
Stroop Effect ◽  
Ganglion Cells ◽  
Retinal Ganglion ◽  
Highly Sensitive ◽  
Light Effects ◽  
Response Task ◽  
Stimulation Of

AbstractPeople are constantly exposed to blue light while engaging in work. It is thus crucial to understand if vast exposure to blue light influences cognitive control, which is essential for working efficiently. Previous studies proposed that the stimulation of intrinsically photosensitive retinal ganglion cells (ipRGCs), a newly discovered photoreceptor that is highly sensitive to blue light, could modulate non-image forming functions. Despite studies that showed blue light (or ipRGCs) enhances brain activations in regions related to cognitive control, how exposure to blue light changes our cognitive control behaviorally remains elusive. We examined whether blue light influences cognitive control through three behavioral tasks in three studies: the sustained attention to response task (SART), the task-switching paradigm, and the Stroop task. Classic effects of the SART, switch cost, and the Stroop effect were found, but no differences were observed in results of different background lights across the six experiments. Together, we conclude that these domains of cognitive control are not influenced by blue light and ipRGCs, and whether the enhancement of blue light on brain activities extends to the behavioral level should be carefully re-examined.

scholarly journals Cryptochrome 2 from Lilium × formolongi Regulates Photoperiodic Flowering in Transgenic Arabidopsis thaliana

2021 ◽  
Vol 22 (23) ◽  
pp. 12929
Author(s):  
Xiao-Mei Wu ◽  
Zheng-Min Yang ◽  
Lin-Hao Yang ◽  
Ji-Ren Chen ◽  
Hai-Xia Chen ◽  
...  
Keyword(s):  
Arabidopsis Thaliana ◽  
Blue Light ◽  
Floral Induction ◽  
Vital Role ◽  
Helix Loop Helix ◽  
Photoperiodic Flowering ◽  
Photoperiodic Regulation ◽  
Highly Sensitive ◽  
Cryptochrome 2 ◽  
Seed Propagation

The photoperiodic flowering pathway is essential for plant reproduction. As blue and ultraviolet-A light receptors, cryptochromes play an important role in the photoperiodic regulation of flowering. Lilium × formolongi is an important cut flower that flowers within a year after seed propagation. Floral induction is highly sensitive to photoperiod. In this study, we isolated the CRYPTOCHROME2 gene (LfCRY2) from L. × formolongi. The predicted LfCRY2 protein was highly homologous to other CRY2 proteins. The transcription of LfCRY2 was induced by blue light. LfCRY2 exhibits its highest diurnal expression during the floral induction stage under both long-day and short-day photoperiods. Overexpression of LfCRY2 in Arabidopsis thaliana promoted flowering under long days but not short days, and inhibited hypocotyl elongation under blue light. Furthermore, LfCRY2 was located in the nucleus and could interact with L. × formolongi CONSTANS-like 9 (LfCOL9) and A. thaliana CRY-interacting basic-helix-loop-helix 1 (AtCIB1) in both yeast and onion cells, which supports the hypothesis that LfCRY2 hastens the floral transition via the CIB1-CO pathway in a manner similar to AtCRY2. These results provide evidence that LfCRY2 plays a vital role in promoting flowering under long days in L. × formolongi.

Direct Blue Light-Induced Autocatalytic Oxidation of o-Phenylenediamine for Highly Sensitive Visual Detection of Triaminotrinitrobenzene

2019 ◽  
Vol 91 (9) ◽  
pp. 6155-6161 ◽  
Author(s):  
Jinhu Wang ◽  
Hua Li ◽  
Yanhua Cai ◽  
Dunju Wang ◽  
Liang Bian ◽  
...  
Keyword(s):  
Blue Light ◽  
Visual Detection ◽  
Direct Blue ◽  
Highly Sensitive ◽  
Autocatalytic Oxidation

West Nile virus in plasma is highly sensitive to methylene blue-light treatment

Transfusion ◽  
2004 ◽  
Vol 44 (6) ◽  
pp. 886-890 ◽  
Author(s):  
Harald Mohr ◽  
Joseph Knüver-Hopf ◽  
Ute Gravemann ◽  
Anette Redecker-Klein ◽  
Thomas H. Müller
Keyword(s):  
Methylene Blue ◽  
West Nile Virus ◽  
Blue Light ◽  
Light Treatment ◽  
West Nile ◽  
Highly Sensitive

Ovarian Dysfunction in Fetally Irradiated Beagles

1977 ◽  
Vol 35 ◽  
pp. 658-659
Author(s):  
T. M. Seed ◽  
M. H. Sanderson ◽  
D. L. Gutzeit ◽  
T. E. Fritz ◽  
D. V. Tolle ◽  
...  
Keyword(s):  
Gamma Rays ◽  
Low Dose ◽  
Long Term Effects ◽  
Ovarian Dysfunction ◽  
Dose Rates ◽  
Highly Sensitive ◽  
Microscopic Evaluation ◽  
Ovarian Pathology ◽  
Normal Offspring

The developing mammalian fetus is thought to be highly sensitive to ionizing radiation. However, dose, dose-rate relationships are not well established, especially the long term effects of protracted, low-dose exposure. A previous report (1) has indicated that bred beagle bitches exposed to daily doses of 5 to 35 R 60Co gamma rays throughout gestation can produce viable, seemingly normal offspring. Puppies irradiated in utero are distinguishable from controls only by their smaller size, dental abnormalities, and, in adulthood, by their inability to bear young.We report here our preliminary microscopic evaluation of ovarian pathology in young pups continuously irradiated throughout gestation at daily (22 h/day) dose rates of either 0.4, 1.0, 2.5, or 5.0 R/day of gamma rays from an attenuated 60Co source. Pups from non-irradiated bitches served as controls. Experimental animals were evaluated clinically and hematologically (control + 5.0 R/day pups) at regular intervals.

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