Bioluminescent marine bacteria possess luciferase, which catalyzes the oxidation of reduced flavin mononucleotide and long-chain aldehyde to produce light. Temperature-sensitive mutants of these bacteria can be obtained which require exogenous aldehyde for light production at higher temperatures. In Beneckea harveyi. two classes of such mutants were found which differed with regard to their res...

This paper presents findings on applying physical models in the literature to describe silicon luminescence spectra at 80 – 300 K. Incorporation of exciton recombination models are shown to disagree with the measured luminescence spectra, whereas a free electron-hole recombination model is shown to match well with the luminescence spectra. However, the lack of consideration for excitons is not ...

Rapid, multiplexed, sensitive and specific identification and quantitative detection of nitric oxide (NO) are in great demand in biomedical science. Herein, a novel multifunctional probe based on the intramolecular LRET (luminescence resonance energy transfer) strategy, TRP-NO, was designed for the highly sensitive and selective ratiometric and luminescence lifetime detection of lysosomal NO. B...

Absorption and luminescence spectra and optical amplification in bismuth-doped germanate silicate glass were investigated. Two kinds of bismuth ion valence states could exist in the glass. One is Bi2+, which has shown red luminescence, another might be Bi+, which is the active center for infrared luminescence. The infrared luminescence excited at 700, 800, and 980 nm should be ascribed to the e...

In this paper, possibilities and limits of the application of REE3+ luminescence (especially the Nd3+4F3/2 → 4I9/2 emission) as structural probe are evaluated. Important factors controlling the Nd3+ luminescence signal are discussed, including effects of the crystal-field, crystal orientation, structural state, and temperature. Particular attention was paid to the study of the accessory mineral...

Si nanocrystals embedded in SiO2 doped with P and Au at concentrations in the range of 1 10–3 10 cm 3 exhibit photoluminescence quenching. Upon increasing the Au concentration, a gradual decrease in nanocrystal photoluminescence intensity is observed. Using a statistical model for luminescence quenching, we derive a typical radius of 3 nm for nanocrystals luminescing around 800 nm. Au doping al...

Rapid, multiplexed, sensitive and specific identification and quantitative detection of nitric oxide (NO) are in great demand in biomedical science. Herein, a novel multifunctional probe based on the intramolecular LRET (luminescence resonance energy transfer) strategy, TRP-NO, was designed for the highly sensitive and selective ratiometric and luminescence lifetime detection of lysosomal NO. B...

Lanthanide-doped metal-organic frameworks (Y/Yb/Er-MOF) were synthesized by a low-cost solvothermal method. The obtained Y/Yb/Er-MOF shows the cooperative upconversion luminescence of Yb3+ and Er3+ (Yb3+-sensitized) irradiated continuous wave 980 nm laser. In order to explore potential application in relative humidity (RH) sensors, RH responsiveness was investigated measuring intensity changes ...

  Photoproteins are excellent reporter systems because they don’t have virtually background signal. Aequorin is the most well-known photoprotein. Three improved engineered photoproteins photina, i-photina and c-photina, were also recently developed and optimized for generation of Ca2+ mobilization assays precisely. The total light emission is greater than aequorin and their reacti...