Development of luminescent and nontoxic Pb-free perovskite quantum dots (PQDs) for quantification toxic/nontoxic heavy metal ions has attracted much attention recently. In this paper, blue emissive bare poly(ethylenimine), oleic acid stabilized methylammonium tin tribromide (MASnBr3QDs PEI-OA-MASnBr3QDs) are developed via modified synthetic routes with fluorescent yields (Φf) 8.7 14.6%, respectively. The particle size, structures, diffraction patterns, surface potential PQDs investigated...

Basic characteristics of variable-rate video coders applied to asynchronous transfer mode (ATM) transmission are described. Burstiness information is evaluated for conference-type scenes using various coding algorithms. Three measures (distribution, autocorrelation, and coefficient variation) introduced evaluate burstiness. Video sources modeled characterized by the autoregressive process variation. quality improvement achieved with variable rate signal-to-noise ratio (SNR) subjective...

We have studied physiological parameters in a living cell using fluorescence lifetime imaging of endogenous chromophores. In this study, pH dependence the flavin adenine dinucleotide (FAD), that is significant cofactor exhibiting autofluorescence, has been investigated buffer solution and cells. The FAD remained unchanged with 5 to 9 solution. However, HeLa cells was found decrease increasing intracellular pH, suggesting single can be estimated from without adding exogenous fluorescent probes.

The development of aggregation-induced emission enhancement (AIEE) active nanoprobes without any synthetic complication for solution-state and organic thin-film transistor (OTFT)-based sensory applications is still a challenging task. In this study, the novel pyrene-incorporated Schiff base (5-phenyl-4-((pyren-1-ylmethylene)amino)-4H-1,2,4-triazole-3-thiol; PT2) with an AIEE property was synthesized via one-pot reaction reported detecting Zn2+ tyrosine in solution state OTFT. studies PT2 (in...

Abstract In this analysis, we examined whether peptides derived from a wild-type murine proto-oncogene, c-erbB-2, function as tumor rejection Ags. Expression of c-erbB-2 by means reverse transcription-PCR was observed in several normal adult tissues, such intestine, kidney, and testis. We then transduced human cDNA into two mutually noncross-reactive fibrosarcoma lines BALB/c origin, CMS7 CMS17. mice immunized with CMS17HE (CMS17 cDNA), the growth subsequently challenged CMS7HE (CMS7 cDNA)...

ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTExcited-state properties of hypericin: electronic spectra and fluorescence decay kineticsTomoko Yamazaki, Nobuhiro Ohta, Iwao Pill Soon SongCite this: J. Phys. Chem. 1993, 97, 30, 7870–7875Publication Date (Print):July 1, 1993Publication History Published online1 May 2002Published inissue 1 July 1993https://pubs.acs.org/doi/10.1021/j100132a013https://doi.org/10.1021/j100132a013research-articleACS PublicationsRequest reuse permissionsArticle...

Fluorescence lifetime images of reduced nicotinamide adenine dinucleotide (NADH) that is a key cofactor in cellular metabolism were obtained cell at various values intracellular pH. The average fluorescence NADH found to become shorter monotonically with increasing pH, indicating pH single can be determined by imaging without adding exogenous fluorescent probes. magnitude the pH-induced change higher cells than buffer solution. not uniform inside cell; nuclear mitochondrial each and larger...

Novel anthracene-based Schiff base derivative (4-(anthracen-9-ylmethylene) amino)-5-phenyl-4H-1,2,4-triazole-3-thiol; AT2) is synthesized and utilized as an aggregation-induced emission-enhancement (AIEE) active probe to detect Zn2+ Tyrosine. Ultraviolet-visible absorption/photoluminescence (UV-vis/PL) spectroscopy studies on the AIEE property of AT2 (in ethanol) with increasing water fractions (fw: 0–97.5%) confirm J-type aggregation. Excellent sensor selectivity its reversibility Tyrosine...

ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTElectronic-state dependence of intramolecular proton transfer o-hydroxybenzaldehydeShinichi Nagaoka, Umpei Nagashima, Nobuhiro Ohta, Masahisa Fujita, and Takeshi TakemuraCite this: J. Phys. Chem. 1988, 92, 1, 166–171Publication Date (Print):January 1988Publication History Published online1 May 2002Published inissue 1 January 1988https://pubs.acs.org/doi/10.1021/j100312a036https://doi.org/10.1021/j100312a036research-articleACS PublicationsRequest...

Background subtraction is a commonly used process in surveillance systems. One difficult problem when using the maintaining correct background image against changing illumination conditions. Most methods for are based on intuitive definitions about change and implemented as somewhat ad hoc algorithms. In contrast, we first define mathematical models representing relation between intensity, reflection index of objects pixel value. We also mathematically an assumption illumination, which...

Abstract Electric field effects on photochemical dynamics have been examined with particular regard to photoinduced electron transfer (PIET) and excimer formation, based the measurements of emission spectra decays. In various pairs donor acceptor in their linked compounds, following processes are shown be significantly influenced by an electric a polymer film: initial step PIET, back-electron which produces fluorescent state, charge recombination, dissociation radical–ion generated PIET....

This paper is a supplementary article on counting metamers to one presented earlier in this journal. Whereas the previous study basic collection of object-color stimuli contained "jagged" spectral reflectance curves, including great many that exhibit extreme variations within small ranges, present makes use collections which contain "smooth" curves generated by frequency-limited functions. The results obtained are similar those previously, particularly when limiting frequency functions set...

Bismuth oxyiodide (BiOI), a two-dimensional material, is well known for its photocatalytic and photovoltaic properties owing to low bandgap, efficient charge separation, suitable work function that facilitates various reactions. However, the performance of BiOI depends on synthetic methods, as they dictate growth directions overall quality nanosheets or crystals produced. Herein, we investigated morphology charge-separated character in photoexcited states nanocrystals/sheets produced from...

ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTPhotochemical kinetics of ultrasmall semiconductor particles in solution: effect size on the quantum yield electron transferYoshio. Nosaka, Nobuhiro. Ohta, and Hajime. MiyamaCite this: J. Phys. Chem. 1990, 94, 9, 3752–3755Publication Date (Print):May 1, 1990Publication History Published online1 May 2002Published inissue 1 1990https://pubs.acs.org/doi/10.1021/j100372a073https://doi.org/10.1021/j100372a073research-articleACS PublicationsRequest reuse...

Abstract— The relation between the lifetimes of triplet states various porphyrins and their photosensitizing effects on photodynamic therapy (PDT) tumor has been examined. Diethylene‐triamine pentaacetic acid ester 4‐[1‐(2‐hydroxy‐ethyloxy)ethyl]‐2‐vinyl deuteroporphyrin‐IX gallium (III) complex (Ga‐DP), zinc (II) (Zn‐DP), manganese (Mn‐DP) Photofrin II (PII) are used as photosensitizer. have measured for samples adsorbed filter paper (FP) found to be 57 ms 26 610 |xs 9 (PII)....

Susceptibility to Plasmodium chabaudi depends on the relative dominance of Th1/Th2 responses in host mice. A Th2-dominant response during early phase infection susceptible A/J mice causes a fatal disease course due severe malaria. Schistosoma mansoni is potent inducer not only parasite antigens, but also other antigens concurrently existing animals. In spite S. infection, these escape death from malaria and showed accompanied enhanced production IFN-γ antigens. Treatment with anti-IFN-γ mAb...

Fluorescence of ethylcarbazole doped in PMMA polymer films is quenched by an external electric field the presence dimethyl terephthalate, indicating that rate intermolecular electron transfer from a photoexcited molecule ethyl carbazole to terephthalate enhanced applied field. The effect on as well at zero increases with decrease donor−acceptor distance. free energy change reaction estimated be about −0.7 eV films, based fluorescence intensity combined lifetime. molecular polarizability...