A quantitative (multistep) excitation-deactivation model of rose bengal (RB) has been developed which includes energy and electron transfer to oxygen and the possibility of photoproduct formation via higher excited triplet-singlet states. The model is based on previous measurements of non-linear absorption (NLA) and emission of RB with picosecond pulses at 532 nm and on NLA measurements with na...

Economic Considerations in Designing Emergency Management Institutions and Policies for Transboundary Disasters Adam Rose a & Tyler Kustra b a Center for Risk and Economic Analysis of Terrorism Events , Price School of Public Policy University of Southern California , Los Angeles , CA , USA b Wilf Family Department of Politics , New York University , New York , NY , USA Published online: 27 Mar...

Results differ as to whether Brucella infection during pregnancy increases a woman's risk of miscarriage. We determined the seroprevalence of BrucelIa spp. among a sample of women with miscarriage and women with no history of miscarriage in Jordan during January-July 2003. Serum samples were collected from 445 women with miscarriage and a similar number of women with no history of miscarriage, ...

Photogalvanic effect was studied in photogalvanic cells containing Rose Bengal as dyes and Mannitol as reductants. The photogalvanic cells were determined by the photo potential, photocurrent, conversion efficiency, power of cell and performance of cell. The effects of various parameters like pH, light intensity, diffusion length, reductant concentration and dye concentration on the electrical ...

A number of N-phenyl-1,4-naphthoquinone monoimines 6-10 were prepared by on-water oxidative phenylamination of 1,5-dihydroxynaphthalene (1) and 5-acetylamino-1-hydroxynaphthalene (5) with oxygen-substituted phenylamines under aerobic conditions and either solar or green LED radiation, in the presence of rose bengal as singlet oxygen sensitizer. As compared to the conventional oxidative phenylam...

A burst of free oxygen radical production has been demonstrated during the early moments of reperfusion, coincident with the onset of reperfusion arrhythmias, which can be attenuated by antioxidants. We have investigated whether a sudden burst of oxidant stress, superimposed on that occurring during reperfusion, can exacerbate reperfusion arrhythmias. Rat hearts (n = 12/group) were subjected to...

The objective of this study was to evaluate the effect of photodynamic therapy with erythrosine and rose bengal using a light-emitting diode (LED) on planktonic cultures of S. mutans. Ten S. mutans strains, including nine clinical strains and one reference strain (ATCC 35688), were used. Suspensions containing 10⁶ cells/mL were prepared for each strain and were tested under different experiment...

Electronic excitation of a probe chromophore can lead to a change in dipole moment that influences its activity or solubility in solution and changes its relative affinity for partitioning between two phases. Photoexcitation of a probe molecule can, therefore, perturb a sorption equilibrium, and the relaxation kinetics of the probe to the new equilibrium conditions can be monitored in a time-re...

The rose bengal agar developed by Smith and Dawson (Soil Sci., 58, 467-471, 1944) to count soil fungi has a number of advantages over the normal. acidified medium. In addition to having a neutral pH, the dye in the medium will confine the growth of the fungi, particularly those showingaerial and spreading growth. These authors note, however, that a few bacteria are tolerant of the rose bengal u...

The dynamics of the Hindmarsh-Rose (HR) model of bursting thalamic neurons is reduced to a system of two linear differential equations that retains the subthreshold resonance properties of the HR model. Introducing a reset mechanism after a threshold crossing, we turn this system into a resonant integrate-and-fire (RIF) model. Using Monte-Carlo simulations and mathematical analysis, we examine ...