scholarly journals Anion-Capture-Induced Fluorescence Enhancement of Bis(cyanostyryl)pyrrole Based on Restricted Access to a Conical Intersection

2019 ◽  
Vol 92 (11) ◽  
pp. 1807-1815 ◽  
Author(s):  
Soichi Yokoyama ◽  
Akitaka Ito ◽  
Haruyasu Asahara ◽  
Nagatoshi Nishiwaki
Keyword(s):  
Fluorescence Enhancement ◽  
Conical Intersection ◽  
Restricted Access

Restricted access to a conical intersection to explain aggregation induced emission in dimethyl tetraphenylsilole

2016 ◽  
Vol 4 (14) ◽  
pp. 2802-2810 ◽  
Author(s):  
Xing-Liang Peng ◽  
Sergi Ruiz-Barragan ◽  
Ze-Sheng Li ◽  
Quan-Song Li ◽  
Lluís Blancafort
Keyword(s):  
Conical Intersection ◽  
Restricted Access ◽  
Aggregation Induced Emission ◽  
Radiationless Decay

Aggregation-induced emission of dimethyl tetraphenylsilole is due to restricted access to a conical intersection. The intersection allows for radiationless decay in solution but is not reachable in the aggregate phase.

A Photoactivable Formaldehyde Donor with Fluorescence Monitoring Reveals Threshold to Arrest Cell Migration

2019 ◽  
Author(s):  
Lukas P Smaga ◽  
Nicholas W Pino ◽  
Gabriela E Ibarra ◽  
Vishnu Krishnamurthy ◽  
Jefferson Chan
Keyword(s):  
Wound Healing ◽  
Cell Migration ◽  
Fluorescence Enhancement ◽  
Biological Effects ◽  
Cellular Systems ◽  
Live Cells ◽  
First Report ◽  
Cell Lysate ◽  
Intracellular Release ◽  
Biological Analytes

Controlled light-mediated delivery of biological analytes enables the investigation of highly reactivity molecules within cellular systems. As many biological effects are concentration dependent, it is critical to determine the location, time, and quantity of analyte donation. In this work, we have developed the first photoactivatable donor for formaldehyde (FA). Our optimized photoactivatable donor, photoFAD-3, is equipped with a fluorescence readout that enables monitoring of FA release with a concomitant 139-fold fluorescence enhancement. Tuning of photostability and cellular retention enabled quantification of intracellular FA release through cell lysate calibration. Application of photoFAD-3 uncovered the concentration range necessary for arresting wound healing in live cells. This marks the first report where a photoactivatable donor for any analyte has been used to quantify intracellular release.

Preparation and application of internal surface reversed-phase restricted-access material

2013 ◽  
Vol 30 (8) ◽  
pp. 810-815 ◽  
Author(s):  
Xiaoyu WU ◽  
Rong WANG ◽  
Hua XIE ◽  
Jianfeng WANG ◽  
Pei YANG ◽  
...  
Keyword(s):  
Internal Surface ◽  
Reversed Phase ◽  
Restricted Access ◽  
Restricted Access Material

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.

Magnetic restricted-access carbon nanotubes for the extraction/pre-concentration of organophosphates from food samples followed by spectrophotometric determination

2020 ◽  
Vol 241 ◽  
pp. 118632
Author(s):  
Pedro Marcos Frugeri ◽  
Marcello Henrique da Silva Cavalcanti ◽  
Ayla Campos do Lago ◽  
Eduardo Costa Figueiredo ◽  
Cesar Ricardo Teixeira Tarley ◽  
...  
Keyword(s):  
Carbon Nanotubes ◽  
Spectrophotometric Determination ◽  
Food Samples ◽  
Restricted Access

Semiautomated microfluorometric instrument and reagent system for monitoring disease-related immunosuppression.

1982 ◽  
Vol 28 (9) ◽  
pp. 1887-1893 ◽  
Author(s):  
D F Ranney ◽  
A J Quattrone
Keyword(s):  
Immune Response ◽  
Dna Content ◽  
Peripheral Blood ◽  
Fluorescence Enhancement ◽  
Photon Counting ◽  
Peripheral Blood Lymphocytes ◽  
Response Modulation ◽  
Blood Lymphocytes ◽  
Complex Test ◽  
Immune Response Modulation

Abstract Several common metabolites and drugs in the serum in of patients with inflammatory, infectious, autoimmune, immunodeficient, neoplastic, and toxicant-induced diseases can produce artifactual suppression of the [methyl-3H]-thymidine assay, which is widely used to evaluate lymphocyte responsiveness. We have developed a sensitive, semiautomated, fluorescence-enhancement assay in which true immunosuppressors are measured in the presence of absence of such interfering substances. Peripheral blood lymphocytes are activated with mitogens in standard microtiter culture trays. Changes in lymphocyte DNA content are quantified with a reagent formulation containing mithramycin, the fluorescence of which is enhanced on binding to DNA in the presence of MgCl2. We solubilize cells within the intact microtiter tray by using an automated, inverted "Array Sonicator," and measure fluorescence with an automated, photon-counting fluorometer. With this system, immune response modulation can be accurately assessed in the presence of patients' sera and other complex test substances (e.g., supernates from hybridomas, fermentation vats, viral preparations, and macrophage cultures.

scholarly journals Enhancement of strong-field multiple ionization in the vicinity of the conical intersection in 1,3-cyclohexadiene ring opening

2013 ◽  
Vol 139 (18) ◽  
pp. 184309 ◽  
Author(s):  
Vladimir S. Petrovic ◽  
Sebastian Schorb ◽  
Jaehee Kim ◽  
James White ◽  
James P. Cryan ◽  
...  
Keyword(s):  
Ring Opening ◽  
Strong Field ◽  
Conical Intersection ◽  
Multiple Ionization
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