In order to estimate vegetation photosynthesis from remote sensing observations; some critical parameters need to be quantified. From all absorbed light; the plant needs to release any excess that is not used for photosynthesis; by non-photochemical quenching; by fluorescence emission and unregulated thermal dissipation. Non-photochemical quenching (NPQ) processes are controlled photoprotective...

Interaction between bovine serum albumin (BSA) and phosphorus heterocycles (PHs) was studied using multi-spectroscopic techniques. The results indicated the high binding affinity of PHs to BSA as it quenches the intrinsic fluorescence of BSA. The experimental data suggested the fluorescence quenching mechanism between PHs and BSA as a dynamic quenching. From the UV-vis studies, the apparent ass...

a sensitive and fast chemiluminescence (cl) method has been described for the direct determination of atropine. the method is based on the quenching effect of atropine on the cl signals of the luminol– h2o2 reaction catalyzed by hemin in an alkaline medium. hemin could strongly enhance the chemiluminescence of the luminol–h2o2 system. the luminophor of the luminol–h2o2–hemin cl system was ident...

bacteria use a chemical language to communicate with each other which enables them to synchronize gene expression as a result of cell density. this special language which is called quorum sensing (qs) is based on producing and sensing the small signals and eventually leads them to perceive when a minimum population unit is reached. on the contrary, quorum sensing blockade (quorum quenching) has...

In this paper, we have investigated characteristics of ultraviolet and visible radiation generated by the 2.7 MeV electrons. It is shown that Cherenkov (ChR) intensity predominates over scintillations including wavelength shifting cathodoluminescence quenching in pure poly(methylmethacrylate) (PMMA) for such electron energy. To separate ChR scintillations, measured emission spectra orientation ...

Jet quenching has been established as one of the main tools to study the properties of the medium produced in heavy ion collisions. Most of the experimental effort has been, up to now, on the measurements of inclusive particle suppression. This observable suffers, however, of limitations due to different trigger-bias effects. The study of jets (or particle correlations) in a medium is the most ...

Abstract A singlet oxygen production was monitored using a sensor green chemical probe; reaction of probe with produces fluorescent endoperoxide. Adding ethanol to the irradiated system resulted in decrease fluorescence signal, which indicates concentration formed under UV-C irradiation. Thus, likely quench study. This quenching did not occur use methanol. When irradiating E. coli cells presenc...

Lichens are often found growing on exposed rocks or trees, where they face high levels of irradiation while in the desiccated state. To grow and survive, lichens must resist photodamage while desiccated and resume photosynthesis soon after hydration. Since PSII is often a target of desiccation-induced damage, lichens must render PSII largely inactive and/or minimize the amount of solar radiatio...