Nonspherical Uniaxial Azobenzene Polymer Particles and Their Shape Changes under UV- or White-Light Irradiation for Stimuli-Response Applications

2020 ◽  
Vol 2 (6) ◽  
pp. 2485-2494
Author(s):  
Tomomichi Itoh ◽  
Tetsuo Tamamitsu ◽  
Tatsuro Aki ◽  
Kento Tsutsui ◽  
Yuki Mori ◽  
...  
Keyword(s):  
White Light ◽  
Light Irradiation ◽  
Polymer Particles ◽  
Azobenzene Polymer ◽  
Stimuli Response ◽  
Shape Changes

scholarly journals Arene Ruthenium Metalla-Assemblies with Anthracene Moieties for PDT Applications

Inorganics ◽  
2018 ◽  
Vol 6 (3) ◽  
pp. 97 ◽  
Author(s):  
Marie Gaschard ◽  
Farzaneh Nehzat ◽  
Thomas Cheminel ◽  
Bruno Therrien
Keyword(s):  
Molecular Structure ◽  
Single Crystal ◽  
General Formula ◽  
Structure Analysis ◽  
White Light ◽  
Light Irradiation ◽  
Synthesis And Characterization ◽  
X Ray

The synthesis and characterization of three metalla-rectangles of the general formula [Ru4(η6-p-cymene)4(μ4-clip)2(μ2-Lanthr)2][CF3SO3]4 (Lanthr: 9,10-bis(3,3’-ethynylpyridyl) anthracene; clip = oxa: oxalato; dobq: 2,5-dioxido-1,4-benzoquinonato; donq: 5,8-dioxido-1,4-naphthoquinonato) are presented. The molecular structure of the metalla-rectangle [Ru4(η6-p-cymene)4(μ4-oxa)2(μ2-Lanthr)2]4+ has been confirmed by the single-crystal X-ray structure analysis of [Ru4(η6-p-cymene)4(μ4-oxa)2(μ2-Lanthr)2][CF3SO3]4 · 4 acetone (A2 · 4 acetone), thus showing the anthracene moieties to be available for reaction with oxygen. While the formation of the endoperoxide form of Lanthr was observed in solution upon white light irradiation, the same reaction does not occur when Lanthr is part of the metalla-assemblies.

scholarly journals LED and UV Light Utilizing Flavonoids and Limonoids to Investigate the Effect of Post-harvest Light Irradiation

2020 ◽  
Author(s):  
Shengyu Liu
Keyword(s):  
White Light ◽  
Uv Light ◽  
Light Emitting Diode ◽  
Red Light ◽  
Principal Component ◽  
Experimental Period ◽  
Light Irradiation ◽  
Flavonoid Glycosides ◽  
Clear Correlation ◽  
Post Harvest

To investigate the effect of post-harvest light irradiation on the accumulation of flavonoids and limonoids, harvestedNewhall navel oranges were continuously exposed to light-emitting diode (LED) and ultraviolet (UV) light irradiationfor 6 days, and the composition and content of flavonoids and limonoids in the segments were determined usingUPLC-qTOF-MS at 0, 6, and 15 days after harvest. In total, six polymethoxylated flavonoids (PMFs), fiveflavoneO/C-glycosides, seven flavanone-O-glycosides, and three limonoids were identified in the segments. Theaccumulation of these components was altered by light irradiation. Red and blue light resulted in higher levels ofPMFs during exposure periods. The accumulation of PMFs was also significantly induced after white light, UVBand UVC irradiation were removed. Red and UVC irradiation induced the accumulation of flavone and flavanoneglycosides throughout the entire experimental period. Single light induced limonoid accumulation during exposureperiods, but limonoid levels decreased significantly when irradiation was removed. Principal component analysisshowed a clear correlation between PMFs and white light, between flavonoid glycosides and red light and UVC,and between limonoids and UVC. These results suggest that the accumulation of flavonoids and limonoids in citrusis regulated by light irradiation. White light, red light and UVC irradiation might be a good potential method forimproving the nutrition and flavor quality of post-harvest citrus.

Inhibition and disaggregation of amyloid β protein fibrils through conjugated polymer–core thermoresponsive micelles

2020 ◽  
Vol 8 (44) ◽  
pp. 10126-10135
Author(s):  
Hao Geng ◽  
Hongbo Yuan ◽  
Liang Qiu ◽  
Dong Gao ◽  
Yongqiang Cheng ◽  
...  
Keyword(s):  
Reactive Oxygen Species ◽  
White Light ◽  
Conjugated Polymer ◽  
Amyloid Β ◽  
Reactive Oxygen ◽  
Light Irradiation ◽  
Amyloid Β Protein ◽  
Oxygen Species ◽  
Β Protein ◽  
Protein Fibrils

The micelles (CPMs) have a thermoresponsive surface and reactive oxygen species (ROS) generating core. At 37 °C, CPMs captured Aβ aggregates to inhibit and disaggregate aggregates under white-light irradiation, reducing Aβ-induced cytotoxicity.

scholarly journals Effect of Post-Harvest LED and UV Light Irradiation on the Accumulation of Flavonoids and Limonoids in the Segments of Newhall Navel Oranges (Citrus sinensis Osbeck)

Molecules ◽  
2019 ◽  
Vol 24 (9) ◽  
pp. 1755 ◽  
Author(s):  
Shengyu Liu ◽  
Linping Hu ◽  
Dong Jiang ◽  
Wanpeng Xi
Keyword(s):  
White Light ◽  
Uv Light ◽  
Light Emitting Diode ◽  
Red Light ◽  
Principal Component ◽  
Light Irradiation ◽  
Flavonoid Glycosides ◽  
Clear Correlation ◽  
Post Harvest ◽  
Uv Light Irradiation

To investigate the effect of post-harvest light irradiation on the accumulation of flavonoids and limonoids, harvested Newhall navel oranges were continuously exposed to light-emitting diode (LED) and ultraviolet (UV) light irradiation for 6 days, and the composition and content of flavonoids and limonoids in the segments were determined using UPLC-qTOF-MS at 0, 6, and 15 days after harvest. In total, six polymethoxylated flavonoids (PMFs), five flavone-O/C-glycosides, seven flavanone-O-glycosides, and three limonoids were identified in the segments. The accumulation of these components was altered by light irradiation. Red and blue light resulted in higher levels of PMFs during exposure periods. The accumulation of PMFs was also significantly induced after white light, UVB and UVC irradiation were removed. Red and UVC irradiation induced the accumulation of flavone and flavanone glycosides throughout the entire experimental period. Single light induced limonoid accumulation during exposure periods, but limonoid levels decreased significantly when irradiation was removed. Principal component analysis showed a clear correlation between PMFs and white light, between flavonoid glycosides and red light and UVC, and between limonoids and UVC. These results suggest that the accumulation of flavonoids and limonoids in citrus is regulated by light irradiation. White light, red light and UVC irradiation might be a good potential method for improving the nutrition and flavor quality of post-harvest citrus.

Effect of white light irradiation on the systems ITO/poly(4,4′-dipentoxy-2,2′bithiophene)/aluminium and ITO/poly(3-butylthiophene)/aluminium

1998 ◽  
Vol 335 (1-2) ◽  
pp. 168-173 ◽  
Author(s):  
N. Camaioni ◽  
G. Casalbore-Miceli ◽  
G. Beggiato ◽  
A. Geri ◽  
M. Catellani
Keyword(s):  
White Light ◽  
Light Irradiation

scholarly journals Seed germination in Miconia theaezans (Bonpl.) Cogniaux (Melastomataceae)

2007 ◽  
Vol 50 (4) ◽  
pp. 571-578 ◽  
Author(s):  
Simone Godoi ◽  
Massanori Takaki
Keyword(s):  
Seed Germination ◽  
White Light ◽  
Diffusion Processes ◽  
Light Irradiation ◽  
Optimum Temperature ◽  
Strong Light ◽  
Maximum Induction ◽  
Successional Species ◽  
Maximum Temperatures ◽  
Alternating Temperature

The effects of light and temperature were studied on the seeds of Miconia theazeans by isothermic and alternating temperature incubations. The optimum temperature for seed germination was determined by final percentage and germination rates as located in the range of 27.5 to 30 °C and by germination kinetics at the range of 19.5 to 30 °C. The germination was dependent on diffusion processes. The minimum and maximum temperatures were 12.5-15°C and 32.5-35°C, respectively. The seeds showed strong light dependence for germination with the necessity of daily 4-6 h white light irradiation for the maximum induction of germination. However, under 30-20 °C alternating temperatures, daily 2 hours white light was enough to induce germination and attained maximum under 4 h photoperiod. The results indicated that M. theazeans presented characteristics of early successional species.

scholarly journals Effect of exogenous stress factors on the biosynthesis of carotenoids and lipids by Rhodotorula yeast strains in media containing agro-industrial waste

2019 ◽  
Vol 35 (10) ◽  
Author(s):  
Anna M. Kot ◽  
Stanisław Błażejak ◽  
Marek Kieliszek ◽  
Iwona Gientka ◽  
Joanna Bryś ◽  
...  
Keyword(s):  
Oxidative Stress ◽  
Low Temperature ◽  
White Light ◽  
Unsaturated Fatty Acids ◽  
Rhodotorula Glutinis ◽  
Stress Factors ◽  
Light Irradiation ◽  
Carotenoid Content ◽  
Total Carotenoid Content ◽  
Exogenous Stress

Abstract In this study, we aimed to determine the effect of exogenous stress factors (sodium chloride as osmotic stressor, hydrogen peroxide as an inducer of oxidative stress, white light irradiation, and low temperature) on the biosynthesis of carotenoids and lipids by red yeast (Rhodotorula glutinis, R. mucilaginosa, and R. gracilis) during cultivation in media containing potato wastewater and glycerol. According to our results, the yeast were able to grow and biosynthesize lipids and carotenoids in the presence of the applied stress factors. Low temperature caused an increase in the biosynthesis of intracellular lipids and carotenoids. R. gracilis synthesized lipids (21.1 g/100 gd.w.) and carotenoids (360.4 µg/gd.w.) in greater quantities than that of other strains. Under these conditions, there was also an increase in the content of unsaturated fatty acids, especially linoleic and linolenic acids. The highest percentage of polyunsaturated fatty acid (PUFA) (30.4%) was synthesized by the R. gracilis yeast after cultivation at 20°C. Their quantity was 2.5-fold greater than that of the biomass grown in control conditions. The contribution of individual carotenoid fractions depended both on the yeast strain and the culture conditions. Induction of osmotic stress and low temperature intensified the biosynthesis of β-carotene (up to 73.9% of the total carotenoid content). In oxidative stress conditions, yeast synthesized torulene (up to 82.2%) more efficiently than under other conditions, whereas white light irradiation increased the production of torularhodin (up to 20.0%).

Structural origins, tunable photoluminescence governed by impurities and white-light irradiation in transparent Pr3+:BaTiO3 glass-ceramics

CrystEngComm ◽  
2019 ◽  
Vol 21 (23) ◽  
pp. 3613-3618 ◽  
Author(s):  
Wenqing Xie ◽  
Panpan Li ◽  
Qijing Zhu ◽  
Yun Wang ◽  
Yunjie Zhang ◽  
...  
Keyword(s):  
Active Control ◽  
White Light ◽  
Fluorescence Emission ◽  
Glass Ceramics ◽  
Light Irradiation ◽  
Structure Evolution ◽  
Induced Structure

Study for impurity- and irradiation-induced structure evolution in mono Pr3+:BaTiO3 glass ceramics notably promotes the active control of fluorescence emission.

Aluminum phthalocyanine and gold nanorod conjugates: the combination of photodynamic therapy and photothermal therapy to kill cancer cells

2012 ◽  
Vol 16 (07n08) ◽  
pp. 802-808 ◽  
Author(s):  
J. Wang ◽  
H. Yan Tang ◽  
W. Li Yang ◽  
J. Yao Chen
Keyword(s):  
Photodynamic Therapy ◽  
Cell Viability ◽  
Cancer Cells ◽  
White Light ◽  
Photothermal Therapy ◽  
Red Light ◽  
Carcinoma Cells ◽  
Light Irradiation ◽  
Surface Plasmon Coupling ◽  
Electrostatic Binding

The sulfonated aluminum phthalocyanines (AlPcSs), popularly used photosensitizers, were linked on the surfaces of gold nanorods (AuNRs) by the electrostatic binding to form AlPcS–AuNRs conjugates, in order to improve the photo-therapy efficiency of cancer cells by combining the photodynamic therapy (PDT) of AlPcSs and the photothermal therapy (PTT) of AuNRs . The AlPcS's fluorescence is two-fold enhanced when they adhered on the surfaces of AuNRs probably due to the surface Plasmon coupling, which would facilitate the AlPcS detection. The fluorescence images show that AuNRs can carry loaded AlPcSs to penetrate into human nasopharyngeal carcinoma cells with a fast speed, achieving the effective intracellular delivery of AlPcSs . The PTT effect of cellular AuNRs alone under the white light irradiation of 50 minutes decreased the cell viability to 77%, and the PDT effect of cellular AlPcS–AuNRs with filtered red light (670–710 nm) irradiation of 50 min lowered the cell viability to 79%. However, with the same white light irradiation of 50 min, the AlPcS–AuNRs destroyed most cells leaving the cell viability to 28%, reflecting a typical synergistic effect on cell killing. These results suggest that the combination of PTT and PDT with AlPcS–AuNRs is a promising strategy for improving the phototherapy of cancers.

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