scholarly journals Methyl-restricted rotor rotation on the stator produces high-efficiency fluorescence emission: a new strategy to achieve aggregation-induced emission

RSC Advances ◽  
2019 ◽  
Vol 9 (21) ◽  
pp. 12078-12084 ◽  
Author(s):  
Haicheng Yang ◽  
Xinyue Zhou ◽  
Tianqi Hui ◽  
Yingying Han ◽  
Xiaonan Jiang ◽  
...  
Keyword(s):  
Energy Loss ◽  
Fluorescence Enhancement ◽  
High Efficiency ◽  
Fluorescence Emission ◽  
Aggregation Induced Emission ◽  
Rotor Rotation ◽  
New Strategy

At present, we have realized that the aggregation-induced emission (AIE) achieves the purpose of fluorescence enhancement by restricting rotations to reduce intermolecular or intramolecular energy loss.

scholarly journals Emission Enhancement of Fluorescent Molecules by Antireflective Arrays

Research ◽  
2019 ◽  
Vol 2019 ◽  
pp. 1-8 ◽  
Author(s):  
Hongbo Xu ◽  
Lingxiao Liu ◽  
Fei Teng ◽  
Nan Lu
Keyword(s):  
Energy Dissipation ◽  
Fluorescence Enhancement ◽  
Fluorescence Emission ◽  
Effective Strategy ◽  
Emission Enhancement ◽  
New Strategy ◽  
Fluorescent Molecules

Traditional fluorescence enhancement based on a match of the maximum excitation or emission of fluorescence molecule with the spectra of the nanostructure can hardly enhance blue and red fluorescent molecules. Here, an enhanced method which is a new strategy based on the antireflective array has been developed to enhance the emission of blue and red fluorescent molecules. The fluorescence emission is enhanced by increasing the absorption at excitation wavelengths of the fluorescent molecules and reducing the fluorescent energy dissipation with an antireflective array. By introducing the antireflective arrays, the emission enhancement of blue and red fluorescent molecules is, respectively, up to 14 and 18 fold. It is a universal and effective strategy for enhancing fluorescence emission, which could be applied to enhance the intensity of organic LED and imaging.

The Difference in Sensing Properties Towards Anions between Two Pyridinium Amide-Based Receptors with a Subtle Change of H-Bond Position

2020 ◽  
Vol 17 (6) ◽  
pp. 472-478
Author(s):  
Wei-tao Gong ◽  
Wei-dong Qu ◽  
Guiling Ning
Keyword(s):  
Fluorescence Enhancement ◽  
Small Difference ◽  
Fluorescence Emission ◽  
Subtle Change ◽  
Sensing Properties ◽  
Naked Eye ◽  
Recognition Ability ◽  
The Difference ◽  
L1 And L2

Two pyridinium amide-based receptors L1 and L2 with a small difference of H-bond position of the amide have been synthesized and characterized. Interestingly, they exhibited a huge difference in sensing towards AcO- and H2PO4 -, respectively. Receptor L1 was found to be ‘naked-eye’ selective for AcO- anions, while receptor L2 showed clear fluorescence enhancement selective to H2PO4 - anion. The recognition ability has been established by fluorescence emission, UV-vis spectra, and 1HNMR titration.

Sensitive and specific detection of peroxynitrite and in-vivo imaging of inflammation by a "simple" AIE bioprobe

2021 ◽  
Author(s):  
Huilin Xie ◽  
Jingtian Zhang ◽  
Chao Chen ◽  
Feiyi Sun ◽  
Haixiang Liu ◽  
...  
Keyword(s):  
In Vivo Imaging ◽  
Fluorescence Enhancement ◽  
Specific Detection ◽  
Aggregation Induced Emission

A luminogenic bioprobe TPE-DMAB for simple and specific detection of peroxynitrite (ONOO−) has been developed. TPE-DMAB exhibits aggregation-induced emission (AIE) characteristic and shows fluorescence enhancement (up to 100-fold) upon cleavage...

Pillar[5]arene-based supramolecular assemblies with two-step sequential fluorescence enhancement for mitochondria-targeted cell imaging

2020 ◽  
Vol 8 (44) ◽  
pp. 15622-15625
Author(s):  
Hao Guo ◽  
Xin Yan ◽  
Bing Lu ◽  
Jin Wang ◽  
Xiaolei Yuan ◽  
...  
Keyword(s):  
Live Cell Imaging ◽  
Cell Imaging ◽  
Fluorescence Enhancement ◽  
Fluorescence Emission ◽  
Supramolecular Assemblies ◽  
Live Cell ◽  
Supramolecular Nanoparticles

Two-step sequential fluorescence emission enhanced supramolecular nanoparticles are constructed from pillar[5]arene based host–guest interaction and a linear amphiphile. These supramolecular nanoparticles can be applied in mitochondria-targeted live cell imaging.

Nanomaterials combine multiple therapeutic approaches for cancer cell multidrug resistance, ferroptotic cell death is promising in various cancers

2021 ◽  
Author(s):  
Moataz Dowaidar
Keyword(s):  
Cell Death ◽  
Multidrug Resistance ◽  
Cancer Cell ◽  
High Efficiency ◽  
New Technologies ◽  
Multidrug Resistant ◽  
Therapeutic Approaches ◽  
Combination Strategies ◽  
New Strategy ◽  
Chemotherapy Patients

Cancer cell multidrug resistance (MDR) is one of the most significant barriers to chemotherapy patients' ability to treat malignant tumors.This review first discusses the basic processes of MDR and then details the newest usage of nanomaterials combining multiple therapeutic approaches (e.g. PDT, PTT, gas therapy, gene therapy, and CDT) with MDR chemotherapy. We also analyze the advantages and rationales of these combination systems and why they can reduce MDR cancer cells. Currently, together with various new treatment approaches, MDR-related chemotherapeutic research is gaining momentum in search of better therapeutic results. PDT, for example, has the ability to eliminate high-efficiency multidrug-resistant malignancies but has limited relevance to tumor treatment. In this perspective, SDT is a highly promising approach as it increases ROS production utilizing ultrasonic vibrations, allowing magnitude orders to reach deeper than light. PTT is also often criticized for NIR light's restricted penetration depth; thermomagnetic therapy, using magnetic fields to produce local tissue hyperthermia, can considerably alleviate this problem. However, current research on the possibilities of using these new technologies to fight MDR remains rather rare, and more combination strategies should be carefully investigated in the future. Moreover, ongoing discoveries of cell death pathways, highlighted by recent ferroptosis findings, present a new strategy for our battle against MDR and may revolutionize our knowledge of MDR formation. Ferroptotic cell death promises to treat MDR in various cancers. While most of this cutting-edge research is still in its infancy, we anticipate gaining a deeper understanding of the effectiveness of these revolutionary anti-MDR medicines in the near future.

Fluorescence Enhancement of Europium(III) Perchlorate by 2,2′-Dipyridyl on Bis(benzylsulfinyl)methane Complex

2013 ◽  
Vol 634-638 ◽  
pp. 2462-2465
Author(s):  
Wen Xian Li ◽  
Bo Yang Ao ◽  
Jing Zhang
Keyword(s):  
Rare Earth ◽  
Ternary Complex ◽  
Fluorescence Enhancement ◽  
Fluorescence Emission ◽  
Europium Complex ◽  
New Method ◽  
Rare Earth Complexes ◽  
Fluorescence Properties ◽  
Binary Complex ◽  
Fluorescence Lifetimes

A novel ligand with double sulfinyl groups, bis(benzylsulfinyl)methane L, was synthesized by a new method. Its novel ternary complex, has been synthesized [using L as the first ligand, and dipyridyl L' as the second ligand]. In order to study the effect of the second ligand on the fluorescence properties of rare-earth sulfoxide complex, a novel binary europium complex has been synthesized. Photoluminescent measurement showed that the first ligand L could efficiently transfer the energy to Eu (III) ions in the complex. Furthermore, the detailed luminescence analyses on the rare earth complexes indicated that the ternary Eu (III) complex manifested stronger fluorescence intensities, longer lifetimes, and higher fluorescence quantum efficiencies than the binary Eu (III) materials. The fluorescence emission intensities and fluorescence lifetimes of the ternary complex enhanced more obviously than the binary complex.

scholarly journals Overexpression of Thermophilic α-amylase in Bacillus Licheniformis using a High Efficiency Chromosomal Integration and Amplification Strategy

2021 ◽  
Author(s):  
Peili Shen ◽  
Dandan Niu ◽  
Xuelian Liu ◽  
Kangming Tian ◽  
Permaul Kugenthiren ◽  
...  
Keyword(s):  
Bacillus Licheniformis ◽  
High Efficiency ◽  
High Yield ◽  
Chromosomal Integration ◽  
Bacillus Sp ◽  
Strain Development ◽  
Microbial Cell Factories ◽  
Cell Factories ◽  
New Strategy ◽  
Amplification Strategy

Abstract Highly efficient preparation of industrially important enzymes depends on development of the genetically stable and high-yield microbial cell factories, which is often a challengeable laboratory hard work. In aims to simplify strain development with high efficiency for enzyme overproduction, a new strategy based on chromosomal integration and amplification in Bacillus sp . was developed. A pair of plasmids, an integrated expression plasmid pUB'-Ex1 and a thermosensitive replicable plasmid pUB-MazF, were constructed. pUB'-Ex1 conditionally self-replicated in Bacillus sp . when the RepF in pUB-MazF expressed. pUB-MazF thermosensitively self-replicated in Bacillus sp . , which was easily cured from the host by inducing MazF expression with IPTG. Bacillus licheniformis BL-UBM that integrated with pUB-MazF was then transformed with pUB'-amyS derived from pUB'-Ex1 by in-frame cloning of amyS encoding a thermophilic α-amylase from Geobacillus stearothermophilus ATCC 31195. The transformant of B. licheniformis BL-UBM with pUB'-amyS was cultivated at 42 o C with the existence of 1 mmol/l IPTG and 500 μg/ml kanamycin and the recombinants with high α-amylase activities were selected. All tested recombinants were extremely high genetic stability. One of which, recombinant BLiS-002, carried five copies of amyS and produced the highest yield of α-amylase. It could yield 50,753 U/ml of α-amylase in a 50-l bioreactor. The strategy developed in this study is of application potential for convenient and quick strain development for industrially important enzyme overexpression.

scholarly journals Aromaticity Driven Electrocatalytic Water Oxidation by a Phosphorus-Nitrogen PN3-Pincer Cobalt Complex

2019 ◽  
Author(s):  
Pradip K. Das ◽  
Sarmistha Bhunia ◽  
Priyanka Chakraborty ◽  
Atanu Rana ◽  
Abhishek Dey ◽  
...  
Keyword(s):  
Water Oxidation ◽  
High Efficiency ◽  
Cobalt Complex ◽  
Potential Jump ◽  
Onset Potential ◽  
New Strategy ◽  
Earth Abundant ◽  
High Valent ◽  
Lower Overpotential ◽  
Cobalt Species

Water oxidation is the primary step in both natural and artificial photosynthesis to convert solar energy in into chemical fuels. Herein, we report the first cobalt-based pincer catalyst for electrolytic water oxidation at neutral pH with high efficiency under electrochemical conditions. Most importantly, ligand (pseudo)aromaticity is identified to play an important role in the electrocatalysis. A significant potential jump (~300 mV) was achieved towards a lower positive value when the aromatized cobalt complex was transformed to a (pseudo)dearomatized cobalt species. This complex catalyzes the water oxidation in its high valent oxidation state at a much lower overpotential (~ 340 mV vs. NHE) based on the onset potential (0.5 mA/cm<sup>2</sup>) of catalysis at pH 10.5, outperforming all the other literature systems. These observations may provide a new strategy for the design of earth-abundant transition metal-based water oxidation catalysts.

Fluorescence enhancement novel green analytical method for paraquat herbicide quantification based on immobilization on clay

The Analyst ◽  
2019 ◽  
Vol 144 (10) ◽  
pp. 3357-3363 ◽  
Author(s):  
Marina A. Dominguez ◽  
Matías Insausti ◽  
Romina Ilari ◽  
Graciela P. Zanini
Keyword(s):  
Analytical Method ◽  
Fluorescence Enhancement ◽  
Fluorescence Emission ◽  
Promising Tool ◽  
Emission Enhancement

Fluorescence emission enhancement by adsorption as a promising tool for the development of future green sensors.

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