We isolated and characterized a green fluorescent protein (GFP) from the sea cactus Cavernularia obesa. This GFP exists as a dimer and has absorption maxima at 388 and 498 nm. Excitation at 388 nm leads to blue fluorescence (456 nm maximum) at pH 5 and below, and green fluorescence (507 nm maximum) at pH 7 and above, and the GFP is remarkably stable at pH 4. Excitation at 498 nm leads to green ...

The neurotransmitter molecule phenethylamine (PEA) is studied by fluorescence excitation, mass-resolved excitation, hole burning, and dispersed emission spectroscopies. The excitation spectrum of PEA exhibits a group of five transition bands in the S1 r S0 00 0 region. This group of transitions appears repetitively with the same spectral separations and intensity pattern in the higher energy re...

The emission properties of Eu doped GaN thin films prepared by interrupted growth epitaxy (IGE) were investigated through excitation-wavelength dependent and time-resolved photoluminescence (PL) studies. Under above-gap excitation (333-363 nm) large differences were observed in the Eu PL intensity and spectral features as a function of Ga shutter cycling time. The overall strongest red Eu PL in...

We present an in-depth analysis of molecular excitation in 11 H2-bright planetary and protoplanetary nebulae (PN and PPN). From newly acquired K-band observations, we extract a number of spectra at positions across each source. H2 line intensities are plotted on ‘column density ratio’ diagrams so that we may examine the excitation in and across each region. To achieve this, we combine the shock...