The Experts below are selected from a list of 210 Experts worldwide ranked by ideXlab platform
Meizhen Yin - One of the best experts on this subject based on the ideXlab platform.
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Dual fluorescence switching of a Rhodamine 6G-naphthalimide conjugate with high contrast in the solid state
Journal of Materials Chemistry C, 2018Co-Authors: Lina Tan, Bing Fang, Wenyu Cheng, Meizhen YinAbstract:Solid-state fluorescence switches have attracted tremendous attention in recent years owing to their applications in Fluorescent sensors, security inks and data storage. Herein, we report a novel molecule (2NR) composed of two naphthalimide moieties and a Rhodamine 6G (R6G) unit linked by a branched amidoamine spacer. 2NR exhibits excellent acid and force dual-stimuli-responsive behaviour in the solid state: (i) exposing 2NR powder to HCl vapour results in fluorescence off–on switching, because protonation of the tertiary amine by acid impedes the photoinduced electron transfer process; (ii) further treatment with grinding, the force-induced open-ring reaction of R6G and subsequent efficient fluorescence resonance energy transfer from naphthalimide to the open-ring form of R6G realizes a high-contrast Fluorescent Colour change. Moreover, the branched amidoamine spacer induces a twisted conformation of naphthalene moieties, which provides considerable free volume and significantly facilitates the isomerization process of R6G from spirolactam to open-ring amide. Both fluorescence switches have good reversibility. Consequently, the excellent solid-state Fluorescent switching of 2NR is highly applicable for anti-counterfeiting materials.
Suban K Sahoo - One of the best experts on this subject based on the ideXlab platform.
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three in one type Fluorescent sensor based on a pyrene pyridoxal cascade for the selective detection of zn ii hydrogen phosphate and cysteine
Dalton Transactions, 2018Co-Authors: Yachana Upadhyay, Thangaraj Anand, Lavanya Thilak Babu, Priyankar Paira, Guido Crisponi, Rajender Kumar, Suban K SahooAbstract:A novel Fluorescent receptor L was synthesized by Schiff base condensation of 1-pyrenemethylamine with the vitamin B6 cofactor pyridoxal. The receptor L is highly selective and sensitive towards Zn2+ ions among other tested metal ions. Upon interaction with Zn2+, the receptor L showed a distinct fluorescence enhancement at 485 nm due to the excimer formation leading to the Fluorescent Colour change from blue to bluish-green. Subsequently, when the in situ generated ZnL2 complex interacted with various anions and amino acids, the addition of H2PO4− and cysteine reinstated the fluorescence of the receptor L due to the demetalation of Zn2+ from the ZnL2 complex. Accordingly, the receptor L was developed for the highly selective, specific and sensitive detection of three important bioactive analytes, i.e., Zn2+, H2PO4− and cysteine with a detection limit down to 2.3 × 10−6 M, 2.18 × 10−7 M and 1.59 × 10−7 M, respectively. Additionally, the receptor L was applied to the detection of intracellular Zn2+ ions in live HeLa cells.
Guodong Qian - One of the best experts on this subject based on the ideXlab platform.
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Encapsulation of coumarin dye within lanthanide MOFs as highly efficient white-light-emitting phosphors for white LEDs
CrystEngComm, 2016Co-Authors: Tao Song, Zhang Gege, Yuanjing Cui, Yu Yang, Guodong QianAbstract:In this work, lanthanide metal–organic frameworks with high quantum yields are used to generate phosphors for white-light-emitting diodes (WLEDs). The Fluorescent Colour of these phosphors can be tuned by the different combinations of the ratio of Eu3+/Tb3+ and the content of encapsulated coumarin 460 dye in these complexes. Further, prototype WLEDs were fabricated by coating these phosphors on commercial ultraviolet LED chips.
Colin Moffatt - One of the best experts on this subject based on the ideXlab platform.
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Using Visible Implant Elastomer to tag insects across life stages: a preliminary investigation with blow flies (Diptera: Calliphoridae)
Canadian Entomologist, 2013Co-Authors: Colin MoffattAbstract:Visible Implant Elastomer (VIE) has previously been used successfully to tag individuals in a variety of marine and amphibious animals, earthworms, and scorpions. Visible Implant Elastomer tags were injected into third instars of the blow fly Calliphora vicina Robineau-Desvoidy (Diptera: Calliphoridae) to test its compatibility and retention across life stages. Injecting into the dorsal midline of the 11th segment (7th abdominal segment) produced survival rates of 80%, with no significant difference in the subsequent rate of development (z = 0.21, P = 0.83) as compared to untagged insects. Tags remained visible and allowed identification of individuals within a feeding, intermingling aggregation (maggot mass), especially when a high-contrast Fluorescent Colour was used. Tags were retained across life-stage changes and were easily found in dissected adults.
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Using Visible Implant Elastomer to tag insects across life stages: a preliminary investigation with blow flies (Diptera: Calliphoridae)
The Canadian Entomologist, 2013Co-Authors: Colin MoffattAbstract:AbstractVisible Implant Elastomer (VIE) has previously been used successfully to tag individuals in a variety of marine and amphibious animals, earthworms, and scorpions. Visible Implant Elastomer tags were injected into third instars of the blow fly Calliphora vicina Robineau-Desvoidy (Diptera: Calliphoridae) to test its compatibility and retention across life stages. Injecting into the dorsal midline of the 11th segment (seventh abdominal segment) produced survival rates of 80%, with no significant difference in the subsequent rate of development (z = 0.21, P = 0.83) as compared with untagged insects. Tags remained visible and allowed identification of individuals within a feeding, intermingling aggregation (maggot mass), especially when a high-contrast Fluorescent Colour was used. Tags were retained across life-stage changes and were easily found in dissected adults.
N. D. Pradeep Singh - One of the best experts on this subject based on the ideXlab platform.
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Tetraphenylethylene conjugated p-hydroxyphenacyl: Fluorescent organic nanoparticles for the release of hydrogen sulfide under visible light with real-time cellular imaging
Organic & biomolecular chemistry, 2018Co-Authors: C. Parthiban, M Pavithra, L. Vinod Kumar Reddy, Dwaipayan Sen, S Melvin Samuel, N. D. Pradeep SinghAbstract:Hydrogen sulfide (H2S) behaves like a two-edged sword, at low concentrations it has beneficial and cytoprotective effects, while at higher concentrations it exhibits toxicity. Hence there is a keen interest in developing light responsive H2S donors with a spatio-temporal controlled release. Herein, we report visible light activatable tetraphenylethylene conjugated p-hydroxyphenacyl (TPE-pHP-H2S) nanoparticles for the release of hydrogen sulfide (H2S) with a real time monitoring ability. Our newly designed photoresponsive single component organic nanoparticle based H2S donor is built by integrating the tetraphenylethylene (TPE) moiety and p-hydroxyphenacyl (pHP) group so that it can display both aggregation-induced emission (AIE) and excited state intramolecular proton transfer (ESIPT) properties. Aggregation-induced emission enhancement was exhibited by our TPE-pHP-H2S NP donor, which was then explored for the cellular imaging application. The ESIPT by the pHP moiety provided unique advantages to our TPE-pHP-H2S NP donor which include (i) the excitation wavelength extended to >410 nm (ii) a large Stokes shift (iii) a low inner filter effect and (iv) real-time monitoring of H2S release by a simple Fluorescent Colour change. In vitro studies showed that the TPE-pHP-H2S NP donor presents excellent properties like real-time monitoring, photoregulated H2S release and biocompatibility.
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Nano-pesticide formulation based on Fluorescent organic photoresponsive nanoparticles: for controlled release of 2,4-D and real time monitoring of morphological changes induced by 2,4-D in plant systems
RSC Advances, 2015Co-Authors: Sanghamitra Atta, Manoranjan Bera, Tirthartha Chattopadhyay, Amrita Paul, Mohammed Ikbal, Mrinal K. Maiti, N. D. Pradeep SinghAbstract:In recent times, nano-pesticide formulations have gained great popularity since they enable effective usage of smaller quantities of the pesticides without creating much damage to the environment. The benefits of a nano-pesticide formulation can be further expanded by adding to its arsenal both tracking ability and precise control over the pesticide release. Recently, Fluorescent photoresponsive nanocarriers have gained considerable momentum in the field of drug delivery since they can act as both a “fluorophore” for cell luminescence imaging and a “phototrigger” for regulated drug release by external light stimuli. Hence, we report for the first time a nano-pesticide formulation based on Fluorescent photoresponsive organic nanoparticles of perylene-3-ylmethanol for regulated release of pesticide 2,4-dichlorophenoxyacetic acid (2,4-D). Further, the Fluorescent nature of the photoresponsive organic nanoparticles was used to study the morphological changes induced by 2,4-D inside the plant system using confocal imaging studies. Additionally, the Fluorescent Colour change by photoresponsive organic nanoparticles before and after photorelease was exploited for real time monitoring of 2,4-D release inside the plants. Bioassay experiments revealed that nano-pesticide, Pe-2,4-D efficiently delivered 2,4-D inside the plant tissues improving its herbicidal activity. Such photoresponsive multifunctional nanocarriers with good fluorescence, cellular uptake property and efficient photoregulated release ability will be of great benefit in the construction of nano-pesticide formulations.