Reversible Fluorescence Intensity Change of a Diarylethene

1998 ◽  
Vol 27 (11) ◽  
pp. 1123-1124 ◽  
Author(s):  
Michinori Takeshita ◽  
Masahiro Irie
Keyword(s):  
Fluorescence Intensity ◽  
Intensity Change ◽  
Fluorescence Intensity Change

Sex difference in cardiomyocyte function in normal and metallothionein transgenic mice: the effect of diabetes mellitus

2006 ◽  
Vol 100 (5) ◽  
pp. 1638-1646 ◽  
Author(s):  
Asli F. Ceylan-Isik ◽  
Karissa H. LaCour ◽  
Jun Ren
Keyword(s):  
Transgenic Mice ◽  
Sex Difference ◽  
Fluorescence Intensity ◽  
Contractile Function ◽  
Intensity Change ◽  
Maximal Velocity ◽  
Akt Phosphorylation ◽  
Fura 2 ◽  
Factor C ◽  
Fluorescence Intensity Change

Evidence suggests a sex difference in intrinsic physiological and diabetic myocardial contractile function related to antioxidant properties of female ovarian hormones. This study was designed to examine the effect of cardiac overexpression of antioxidant metallothionein on intrinsic and diabetic cardiomyocyte function. Weight-matched wild-type (FVB) and metallothionein transgenic mice of both sexes were made diabetic with streptozotocin (220 mg/kg). Contractile and intracellular Ca2+ properties were evaluated including peak shortening (PS), time to PS, time to 90% relengthening (TR90), maximal velocity of shortening or relengthening (±d L/d t), fura-2 fluorescence intensity change, and Ca2+ decay rate. Akt and transcription factor c-Jun levels were evaluated by Western blot. Myocytes from female FVB mice exhibited lower PS, ±d L/d t, and fura-2 fluorescence intensity change, prolonged time to PS, TR90, and Ca2+ decay compared with male FVB mice. Interestingly, this sex difference was not present in metallothionein mice. Diabetes depressed PS, ±d L/d t and caffeine-induced Ca2+ release, as well as prolonged TR90 and Ca2+ decay in male FVB mice, whereas it only reduced PS in female FVB mice. These diabetic dysfunctions were nullified by metallothionein in both sexes. Females displayed elevated Akt phosphorylation and reduced c-Jun phosphorylation. Diabetes dampened Akt phosphorylation in male FVB mice and enhanced c-Jun in both sexes. Diabetes-induced alterations in Akt phosphorylation and c-Jun were abolished by metallothionein. The sex difference in Akt phosphorylation but not c-Jun levels was reversed by metallothionein. These data indicate that antioxidant capacity plays an important role in sex differences in both intrinsic and diabetic cardiomyocyte contractile properties possibly related to phosphorylation of Akt and c-Jun.

Aggregation induced emission controlled by a temperature-sensitive organic–inorganic hybrid polymer with a particular LCST

RSC Advances ◽  
2016 ◽  
Vol 6 (89) ◽  
pp. 86012-86018 ◽  
Author(s):  
Mengmeng Li ◽  
Xiaoyan Song ◽  
Tingbin Zhang ◽  
Lintao Zeng ◽  
Jinfeng Xing
Keyword(s):  
Temperature Change ◽  
Fluorescence Intensity ◽  
Intensity Change ◽  
Temperature Sensitive ◽  
Hybrid Polymer ◽  
Inorganic Hybrid ◽  
Aggregation Induced Emission ◽  
Fluorescence Intensity Change

The fluorescence intensity change of TPE encapsulated in POSS–PNIPAM with a particular LCST (37.5 °C) with the temperature change.

scholarly journals Topical Gadobutrol Application Causes Fluorescence Intensity Change in RFP-expressing Tumor-Bearing Mice

2021 ◽  
Vol 7 (2) ◽  
pp. 020301
Author(s):  
Natalia Kazachkina ◽  
Victoria Zherdeva ◽  
Asiya Saydasheva ◽  
Irina Meerovich ◽  
Valery Tuchin ◽  
...  
Keyword(s):  
Aqueous Solution ◽  
Fluorescence Intensity ◽  
Fluorescent Protein ◽  
Intensity Change ◽  
Planar Imaging ◽  
Optical Clearing ◽  
Tissue Fluorescence ◽  
Penetration Depths ◽  
Fluorescence Intensity Change

Optical clearing (OC) allows one to observe tissue structures and metabolic processes occurring in opaque tissues at the depths significantly exceeding the depths that can be reached without OC. Recently, we have shown that gadobutrol is a promising agent for OC of tissues in vivo. The aim of this study was to investigate the effect of time-dependence optical clearing caused by gadobutrol on intensity of fluorescent protein constitutively expressed in subcutaneous tumors in vivo. The measurements were performed in nu/nu mice bearing HEp-2 tumors expressing the red fluorescent protein TagRFP. Gadobutrol was used directly at concentrations 1.0 M aqueous solution or as a 0.7 M aqueous solution containing 5% dimethyl sulfoxide (DMSO). Gadobutrol was applied topically onto the skin above the tumors for 15 min. Tissue fluorescence was measured by using in vivo planar imaging technique. It was shown that the fluorescence intensity of tumors increased by 1.1–1.5 times in different animals under the influence of gadobutrol. The increase in intensity was more pronounced in the case of 0.7 M gadobutrol supplemented with DMSO. Apparently, the observed difference of penetration depths was due to the presence of DMSO in 0.7 M gadobutrol mixture.

An Efficient Ag+-Selective Fluorescent Chemosensor Derived from Tribenzotriquinacene

Synthesis ◽  
2018 ◽  
Vol 50 (07) ◽  
pp. 1457-1461 ◽  
Author(s):  
Xiao-Ping Cao ◽  
Hak-Fun Chow ◽  
Dietmar Kuck ◽  
Zhi-Min Li ◽  
Da Hu ◽  
...  
Keyword(s):  
Fluorescence Intensity ◽  
Single Step ◽  
Fluorescent Chemosensor ◽  
Intensity Change ◽  
Naked Eye ◽  
Silver Salts ◽  
Fluorescent Quenching ◽  
Molecular Framework ◽  
Fluorescence Intensity Change

A new C 3v -symmetrical tribenzotriquinacene (TBTQ) derivative bearing six 8-quinolinyloxymethyl units at the rim of the bowl-shaped molecular framework is synthesized in a single-step by six-fold etherification of the corresponding hexakis(chloromethyl)-TBTQ precursor with 8-hydroxyquinoline. The resulting compound acts as a fluorescence chemosensor, producing a ‘turn-off’ fluorescent quenching response in the presence of Ag+ ions, and is highly selective toward Ag+ over other cations, such as Al3+, Ca2+, Cd2+, Co2+, Cr3+, Cu2+, Fe3+, Ga3+, Hg2+, In3+, K+, Mg2+, Mn2+, Na+, Ni2+, Pb2+, Pd2+, and Zn2+. The fluorescence intensity change of the chemosensor solution can be clearly observed by the naked eye upon addition of silver salts.

scholarly journals Thermo-mechanical and photo-luminescence properties of micro-actuators made of liquid crystal elastomers with cyano-oligo(p-phenylene vinylene) crosslinking bridges

2019 ◽  
Vol 3 (11) ◽  
pp. 2499-2506 ◽  
Author(s):  
Bin Ni ◽  
Hui Chen ◽  
Mengxue Zhang ◽  
Patrick Keller ◽  
Michael Tatoulian ◽  
...  
Keyword(s):  
Phase Transition ◽  
Liquid Crystal ◽  
Fluorescence Intensity ◽  
Photo Luminescence ◽  
Intensity Change ◽  
Phenylene Vinylene ◽  
Liquid Crystal Elastomer ◽  
Micro Actuators ◽  
Liquid Crystal Elastomers ◽  
Fluorescence Intensity Change

Liquid crystal elastomer micropillars containing β-cyano-OPV crosslinkers contract reversibly at nematic–isotropic (N–I) phase transition and undergo fluorescence intensity change. This luminescent variation is mainly caused by N–I phase change.

scholarly journals Effects of Carbonyl-cyanide m-chlorophenylhydrazone on Mitochondrial Function of H9C2 Cells

2017 ◽  
Author(s):  
Ngo Thi Hai Yen ◽  
Bui Thi Van Khanh ◽  
Vu Thao Hien ◽  
To Thanh Thuy ◽  
Pham Thi Bich ◽  
...  
Keyword(s):  
Mitochondrial Function ◽  
Mitochondrial Membrane ◽  
Membrane Lipids ◽  
Structure And Function ◽  
Intensity Change ◽  
H9c2 Cells ◽  
Mitochondrial Structure ◽  
Carbonyl Cyanide ◽  
And Function ◽  
Fluorescence Intensity Change

We examined the effects of carbonyl-cyanide m-chlorophenylhydrazone (CCCP) on mitochondrial function of H9C2 cells. Composition of mitochondrial membrane lipids (cardiolipin) and mitochondrial membrane potential was analyzed by fluorescence intensity change of tetramethl rhodamine ethyl ester (TMRE) and 10-nonyl acridine orange (NAO) using the LSM800 confocal microscope. Our results showed that CCCP strongly and simultaneously affected mitochondrial structure and function of H9C2 cells.

scholarly journals Plasmonic-Ceria Nanoparticles as Fluorescence Intensity and Lifetime Quenching Optical Sensor

Sensors ◽  
2018 ◽  
Vol 18 (9) ◽  
pp. 2818
Author(s):  
Nader Shehata ◽  
Effat Samir ◽  
Ishac Kandas
Keyword(s):  
Gold Nanoparticles ◽  
Fluorescence Intensity ◽  
Aqueous Media ◽  
Fluorescence Emission ◽  
Intensity Change ◽  
Ceria Nanoparticles ◽  
Trivalent Cerium ◽  
Sensing Material ◽  
Volmer Constant

Ceria nanoparticles have been recently used as an optical fluorescent material with visible emission under ultraviolet excitation, due to the formation of trivalent cerium ions with corresponding oxygen vacancies. This paper introduces the enhancement of both fluorescence emission and lifetime through adding gold nanoparticles. The reason is due to possible coupling between the plasmonic resonance of gold nanoparticles and the fluorescence emission of ceria that has been achieved, along with enhanced formation of trivalent cerium ions. Both factors lead to higher fluorescence intensity peaks and shorter fluorescence lifetimes. As an application, gold-ceria nanoparticles have been used as an optical sensing material for lead particles in aqueous media based on fluorescence quenching. Stern-Volmer constant of in-situ gold-ceria nanoparticles is found to be 2.424 M−1, with a relative intensity change of up to 40% at 0.2 g/L.

A Perceptual Bias for Accelerated Intensity Change: An Evolved Mechanism?

2002 ◽  
Author(s):  
John G. Neuhoff ◽  
Kimberly Fukai ◽  
John Preston ◽  
Kate Willaman
Keyword(s):  
Perceptual Bias ◽  
Intensity Change
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