scholarly journals A water-soluble boronic acid sensor for caffeic acid based on double sites recognition

RSC Advances ◽  
2020 ◽  
Vol 10 (47) ◽  
pp. 28148-28156
Author(s):  
Zhancun Bian ◽  
Guiqian Fang ◽  
Ran Wang ◽  
Dongxue Zhan ◽  
Qingqiang Yao ◽  
...  
Keyword(s):  
Synergistic Effect ◽  
Caffeic Acid ◽  
Binding Affinity ◽  
Boronic Acid ◽  
Water Soluble ◽  
Specific Recognition ◽  
Recognition Sites

Herein, the specific recognition of caffeic acid by the double sites boronic acid sensor 5c is reported. The synergistic effect of the two recognition sites greatly improves the binding affinity and selectivity of the sensor.

Boronic acid sensors with double recognition sites: a review

The Analyst ◽  
2020 ◽  
Vol 145 (3) ◽  
pp. 719-744 ◽  
Author(s):  
Zhancun Bian ◽  
Aiqin Liu ◽  
Ying Li ◽  
Guiqian Fang ◽  
Qingqiang Yao ◽  
...  
Keyword(s):  
Binding Affinity ◽  
Boronic Acid ◽  
Recognition Sites ◽  
Acid Sensors

Herein, boronic acid-based sensors containing two recognition sites were summarized systematically. By two recognition sites working synergistically, the binding affinity and selectivity of sensors improve significantly.

scholarly journals Allelopathy of Small Everlasting (Antennaria microphylla): Identification of Constituents Phytotoxic to Leafy Spurge (Euphorbia esula)

Weed Science ◽  
1986 ◽  
Vol 34 (1) ◽  
pp. 8-12 ◽  
Author(s):  
Gary D. Manners ◽  
Donald S. Galitz
Keyword(s):  
Root Growth ◽  
Caffeic Acid ◽  
Leafy Spurge ◽  
Water Soluble ◽  
Euphorbia Esula ◽  
Natural Occurrence ◽  
Lettuce Seed ◽  
Ether Extract ◽  
Small Everlasting ◽  
Antennaria Microphylla

The ether extract of small everlasting (Antennaria microphyllaRydb.) was phytotoxic to lettuce seed root growth and leafy spurge (Euphorbia esulaL. # EPHES) root elongation and cell culture growth. Three phenolic compounds (hydroquinone, arbutin, and caffeic acid) were chromatographically isolated and characterized from the ether extract. Arbutin and caffeic acid were moderately phytotoxic to leafy spurge root growth at 300 ppm (w/v), and hydroquinone was strongly phytotoxic to leafy spurge root growth at 50 ppm (w/v). The observed phytotoxicity of hydroquinone and the high-yield natural occurrence of arbutin, a water soluble, easily hydrolyzed monoglucoside of hydroquinone, in small everlasting is consistent with the participation of these two compounds in the observed allelopathy of small everlasting against leafy spurge.

Ontogeny of Specific Recognition Sites on Lymphocytes

2015 ◽  
pp. 231-239
Author(s):  
I. R�ha ◽  
L. Jaro�kov� ◽  
I. Trebichavsk� ◽  
J. Tr�vn�cek
Keyword(s):  
Specific Recognition ◽  
Recognition Sites

scholarly journals Synergistic effect of water-soluble species and relative humidity on morphological changes in aerosol particles in the Beijing megacity during severe pollution episodes

2019 ◽  
Vol 19 (1) ◽  
pp. 219-232 ◽  
Author(s):  
Xiaole Pan ◽  
Baozhu Ge ◽  
Zhe Wang ◽  
Yu Tian ◽  
Hang Liu ◽  
...  
Keyword(s):  
Relative Humidity ◽  
Synergistic Effect ◽  
Mineral Dust ◽  
Water Soluble ◽  
Dust Particles ◽  
Urban Site ◽  
Chemical Compositions ◽  
Aerodynamic Diameter ◽  
Soluble Species ◽  
Pollution Episodes

Abstract. Depolarization ratio (δ) of backscattered light is an applicable parameter for distinguishing the sphericity of particles in real time, which has been widely adopted by ground-based lidar observation systems. In this study, δ values of particles and chemical compositions in both PM2.5 (aerodynamic diameter less than 2.5 µm) and PM10 (aerodynamic diameter less than 10 µm) were concurrently measured on the basis of a bench-top optical particle counter with a polarization detection module (POPC) and a continuous dichotomous aerosol chemical speciation analyzer (ACSA-14) from November 2016 to February 2017 at an urban site in Beijing megacity. In general, measured δ values depended on both size and sphericity of the particles. During the observation period, mass concentrations of NO3- in PM2.5 (fNO3) were about an order of magnitude higher than that in PM2.5−10 (cNO3) with a mean fNO3∕cNO3 ratio of 14±10. A relatively low fNO3∕cNO3 ratio (∼5) was also observed under higher relative humidity conditions, mostly due to heterogeneous processes and particles in the coarse mode. We found that δ values of ambient particles in both PM2.5 and PM2.5−10 obviously decreased as mass concentration of water-soluble species increased at unfavorable meteorological conditions. This indicated that the morphology of particles was changed as a result of water-absorbing processes. The particles with optical size (Dp) of Dp = 5 µm were used to represent mineral dust particles, and its δ values (δDp=5) decreased by 50 % as the mass fraction of cNO3 increased from 2 % to 8 % and ambient relative humidity increased up to 80 %, suggesting that mineral dust particles were likely to be spherical during humid pollution episodes. During the observation, relative humidity inside the POPC measuring chamber was stable at 34±2 %, lower than the ambient condition. Its influence on the morphology was estimated to be limited and did not change our major conclusion. This study highlights the evident alteration of non-sphericity of mineral dust particles during their transport owing to a synergistic effect of both pollutant coatings and hygroscopic processes, which plays an important role in the evaluation of its environmental effect.

scholarly journals Synergistic effect of water-soluble species and relative humidity on morphological changes of aerosol particles in Beijing mega-city during severe pollution episodes

2018 ◽  
Author(s):  
Xiaole Pan ◽  
Baozhu Ge ◽  
Zhe Wang ◽  
Yu Tian ◽  
Hang Liu ◽  
...  
Keyword(s):  
Relative Humidity ◽  
Synergistic Effect ◽  
Mass Fraction ◽  
Mass Concentration ◽  
Morphological Changes ◽  
Aerosol Particles ◽  
Water Soluble ◽  
Coarse Mode ◽  
Heavy Pollution ◽  
Soluble Species

Abstract. Depolarization ratio (δ) of backscattered light from aerosol particle is an applicable parameter for real-time distinguishing spherical and non-spherical particles, which has been widely adopted by ground-based Lidar observation and satellite remote sensing. From November 2016 to February of 2017, it consecutively suffered from numbers of severe air pollution at Beijing with daily averaged mass concentration of PM2.5 (aerodynamic diameter less than 2.5 μm) larger than 150 μg/m3. We preformed concurrent measurements of water-soluble chemical species and depolarization properties of aerosol particles on the basis of a continuous dichotomous Aerosol Chemical Speciation Analyzer (ACSA-14) and a bench-top optical particle counter with a polarization detection module (POPC). We found that δ value of ambient particles generally decrease as mass concentration of PM2.5 increased at unfavorable meteorological condition. Ratio of mass concentration of nitrate (NO3−) to that of sulfate (SO42−) in PM2.5 was 1.5 ± 0.6, indicating of great importance of NOx in the formation of heavy pollution. Mass concentration of NO3− in PM2.5 (fNO3) was generally an order of magnitude higher than that in coarse mode (cNO3) with a mean fNO3 / cNO3 ratio of 14 ± 10. Relatively high allocation (fNO3/cNO3 = 5) of NO3− in coarse mode could be partially attributed to hygroscopic growth/coagulation of nitrate-rich fine mode particles under higher relative humidity condition. As a result, δ values of particles with Dp = 2 μm (δDp = 2) and 5 μm (δDp = 5) decreased evidently as the mass fraction of water-soluble species (NO3− and SO42−) increase in both PM2.5 and PM2.5–10, respectively. In particular, due to synergistic effect of RH, δDp = 5 value could decrease by 50 % as mass fraction of NO3− in PM2.5–10 increased from 8 % to 23 %. It suggested that alteration of non-sphericity of mineral dust particles was evident owing to coating with pollutants and heterogeneous reactions on the surface of the particle during heavy pollution period. This study brings the attention to great variability of morphological changes of aerosol particles along the transport, which have great complex effects in evaluating their climate and health effect.

PAA/PEDOT:PSS as a multifunctional, water-soluble binder to improve the capacity and stability of lithium–sulfur batteries

RSC Advances ◽  
2016 ◽  
Vol 6 (47) ◽  
pp. 40650-40655 ◽  
Author(s):  
Jin Pan ◽  
Guiyin Xu ◽  
Bing Ding ◽  
Zhi Chang ◽  
Aixiu Wang ◽  
...  
Keyword(s):  
Synergistic Effect ◽  
Cycling Performance ◽  
Water Soluble ◽  
Lithium Sulfur Batteries ◽  
Sulfur Cathodes ◽  
Lithium Sulfur

An improved cycling performance of sulfur cathodes is attributed to the synergistic effect of PAA and PEDOT:PSS.

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