Under excess illumination, plant photosystem II dissipates excess energy through the quenching of chlorophyll fluorescence, a process known as nonphotochemical quenching. Activation of nonphotochemical quenching has been linked to the conversion of a carotenoid with a conjugation length of nine double bonds (violaxanthin) into an 11-double-bond carotenoid (zeaxanthin). It has been suggested tha...

Inverted membrane vesicles from strain 7, a wild type Escherichia coli K12 strain, actively transport calcium with energy supplied either by respiration or by ATP. These vesicles also have energy-linked quenching of quinacrine fluorescence. Membranes of strain 7, depleted of Mg2+ATPase by EDTA treatment, lack both activities. Membrane vesicles from strain NR70, a mutant lacking the Mg2+ATPase, ...

We have analyzed the decays of the fluorescence of colloidal CdSe quantum dots (QDs) suspensions during dilution and titration by the ligands. A ligand shell made of a combination of trioctylphosphine (TOP), oleylamine (OA) and stearic acid (SA) stabilizes the as-synthesized QDs. The composition of the shell was analyzed and quantified using high resolution liquid state 1H nuclear magnetic reso...

The microstructure and mechanical properties of one-step quenching partitioning (Q&P) steel with different time were analyzed. results shows that the elongation rate rises, tensile strength decreases, yield first declines then increases increasing (PT). An optimal combination ductility is obtained when samples are partitioned at 2000 s, corresponding strength, elongation, product 1022 MPa, ...

• This paper presents a thermal characterization of flame quenching by cold surfaces. The temperature evolution was investigated in constant volume chamber. 1-D filtered Rayleigh scattering at 10 kHz implemented very narrow channels. New parameters that could help predicting events are discussed. Understanding the flames surfaces requires an accurate heat transfer. study time resolved thermomet...

We have calculated differential, total and transport cross sections for muonic hydrogen in the n = 2 state scattering from hydrogen. The metastable fraction of the 2S state that slows down below the 2P threshold without undergoing collisional quenching has been calculated as a function of the initial kinetic energy using a Monte Carlo kinetics program. Contrary to earlier estimates, the metasta...