The nitrophenol derivatives have multiple biological effects and their behaviour in environment is of interest. The fluorescence quenching property can be taken into consideration to understand dinitrophenyl ether toxicity. This study employs fluorescence spectroscopy to characterize the interaction of a model compound for dinitrophenyl ethers, namely 1-allyoxy-2,4-dinitrobenzene with two fluor...

We consider reaction-diffusion equations with combustion-type non-linearities in two dimensions and study speed-up of their pulsating fronts by general periodic incompressible flows with a cellular structure. We show that the occurence of front speed-up in the sense limA→∞ c∗(A) = ∞, with A the amplitude of the flow and c∗(A) the (minimal) front speed, only depends on the geometry of the flow a...

It has long been known that quinones quench chlorophyll fluorescence. This study reports the parameters of the fluorescence quenching of chlorophyll a by 1,4-benzoquinone, in ethanol, using the nonlinear analysis. The fluorescence intensity was measured at 670 nm for the blue and red excitation wavelengths: 430 nm and 650 nm, respectively. The quinone concentration in the samples ranged from 3....

Fluorescence quenching of 22 polycyclic aromatic hydrocarbons by nitromethane in toluene and acetonitrile solutions has been studied. Contrary to Sawicki's observations that the fluorescence of hydrocarbons with the fluoranthene skeleton is not quenched that of 11J2and 3.4-benzofluoranthene and fluoranthene itself is quenched. These compounds have a high energy of the fluorescence transition. T...

Luminescence quenching of [Ru(diphenyl-bpr)3]Cl2 and of [Ru(diphenyl-phen)3]Cl2 by 19 transition metal complexes is reported. These complexes have properties which permit them to supplement the widely used [Ru9bpy)3] 2+ and [Ru(phen)3] 2+ sensitizers. The excited state of these complexes can also be tuned significantly by solvent variation. Quenching is predominantly by diffusion. Decay times, ...

the interaction between propranolol (prop) and human serum albumin (hsa) was studied in the presence of dimethyl methylphosphonate (dmmp). dmmp is usually considered as a simulant for chemical warfare agents (cwas). for this purpose fluorescence quenching, resonance light scattering (rls), synchronous, three-dimensional fluorescence spectroscopy and molecular dynamics (md) simulation were emplo...

ABSTRACT The time-scales for galaxy quenching offer clues to its underlying physical drivers. We investigate central in the IllustrisTNG 100-1 simulation, their evolution over time, and pre-quenching properties of galaxies that predict time-scales. Defining duration ?q as time between crossing specific star formation rate (sSFR) thresholds, we find ${\sim} 40{{\ \rm per\ cent}}$ quench rapidly ...

WTe2 and MoTe2 single crystals were grown, some of them quenched, the following properties studied: electroresistivity in temperature range from 1.8 to 300 K, magnetoresistivity at temperatures K magnetic fields up 9 T. On one hand, quenching leads dramatic changes behaviour value MoTe2; type “semiconductor” “metallic”, values before after differ by 8 orders magnitude (!) low temperatures. othe...