<i>The Theory of the Photographic Process</i>

James, T. H.; McCarthy, Mary

doi:10.1063/1.3047790

Cited by 163 publications

(155 citation statements)

References 0 publications

Supporting

Mentioning

146

Contrasting

Unclassified

Order By: Relevance

“…Being a large class of fluorescent pigment, cyanine dye has been used extensively in photosensitization, nonlinear optics, biological fluorescent detection, biomedicine and photodynamic therapy of tumor [41][42][43][44][45]. It is reported that cyanine dye MTC, 3,3′-di(3-sulfo-propyl)-4,5,4′,5′-dibenzo-9-methylthiacarbocyanine triethylammonium salt ( as shown in Figure 2(a)), is an excellent G-quadruplex ligand and could present significant spectral changes and strong fluorescent enhancement when binding to specific G-quadruplex [46].…”

mentioning

confidence: 99%

Roles of flanking sequences in the binding between unimolecular parallel-stranded G-quadruplexes and ligands

et al. 2013

View full text Add to dashboard Cite

G-quadruplexes attract more and more attention in recent years. Numerous small molecules which can induce or stabilize the formation of G-quadruplexes have been investigated on the purpose of anticancer drug development. As a motif existed in physiological condition, flanking sequences are an important part of G-quadruplexes but the study on the impact of flanking sequences on (G-quadruplex)-ligand binding is rarely reported. In this paper, the effects of flanking sequences on binding affinity between a series of unimolecular parallel-stranded G-quadruplex sequences derived from c-myc oncogene promoter (termed as c-myc G-quadruplexes) and their ligands are discussed in detail. The results showed that the flanking sequences on c-myc G-quadruplexes play key roles in (G-quadruplex)-ligand interaction. When a c-myc G-quadruplex is bound to its ligands, the flanking sequences might form a binding cavity above the terminal G-quartet, which could provide a suitable site for ligands to dock in. Moreover, the bases on flanking sequences could interact with ligand through - stacking, and finally form a sandwich-stacking mode (terminal G-quartet, ligand and bases on the flanking sequence). This mode could stabilize the (G-quadruplex)-ligand complex effectively and enhance the binding affinity dramatically. However, flanking sequences are also found to exhibit steric hindrance effect which could impede the (G-quadruplex)-ligand binding. G-quadruplex

show abstract

mentioning

confidence: 99%

Roles of flanking sequences in the binding between unimolecular parallel-stranded G-quadruplexes and ligands

et al. 2013

View full text Add to dashboard Cite

show abstract

“…[9] But such extraordinary high rate (10 11 -3 × 10 12 electrons/s) precludes the possibility of a staged development of the process according to conventional schemes. [11] The experiments on electrolytic reduction of emulsion layers as a whole (not of separate grains) in comparison with chemical reduction (ultrafast chemical developing) of the same layers may be of considerable interest for further elucidation of the general picture. There is no direct injection of electrons from the cathode into the emulsion grains in the electrolytic reduction process.…”

Section: Resultsmentioning

confidence: 99%

Optical trigger based on the molecules of bacteriorhodopsin adsorbed on AgBr nanocrystals

Zakharov

Kudryavtsev

Aslanov

2008

Surface & Interface Analysis

View full text Add to dashboard Cite

It is well known that light absorption triggers transformation chain of bacteriorhodopsin (bR).We propose to use the molecules of bR adsorbed on silver halide crystals to overcome the threshold of spontaneous nucleation from small silver specks to colloidal ones in very short-time interval. Earlier we demonstrated the kinetic curves of the chemical development process for ultrafine-grained emulsion. Colloidal silver particles appeared to lead to effective scattering and absorption of actinic light. Such systems can be considered in the framework of integrated chemical systems.

show abstract

“…Recently, low-bandgap cyanine dyes have been investigated for photoconductive 16 and photovoltaic applications up to 800 nm. 15 Their photophysical properties have been extensively investigated in solution [17][18][19] or when anchored to silver halide 20 or TiO 2 surfaces, 21 however, solid organic films and blends have received little attention. 22,23 In this work, we investigate the charge-transfer characteristics of four cyanine dyes in solid-state blends with poly[2-methoxy-5-(2 0 -ethylhexyloxy)-1,4-phenylenevinylene] (MEH-PPV) and with polystyrene (PS) using absorption and fluorescence spectroscopy, and correlate these characteristics with the D-A energy levels at the heterojunction.…”

Section: Introductionmentioning

confidence: 99%

Photoinduced hole-transfer in semiconducting polymer/low-bandgap cyanine dye blends: evidence for unit charge separation quantum yield

Castro

Benmansour

Moser

et al. 2009

Phys. Chem. Chem. Phys.

View full text Add to dashboard Cite

Power-conversion efficiencies of organic heterojunction solar cells can be increased by using semiconducting donor-acceptor materials with complementary absorption spectra extending to the near-infrared region. Here, we used continuous wave fluorescence and absorption, as well as nanosecond transient absorption spectroscopy to study the initial charge transfer step for blends of a donor poly(p-phenylenevinylene) derivative and low-band gap cyanine dyes serving as electron acceptors. Electron transfer is the dominant relaxation process after photoexcitation of the donor. Hole transfer after cyanine photoexcitation occurs with an efficiency close to unity up to dye concentrations of B30 wt%. Cyanines present an efficient self-quenching mechanism of their fluorescence, and for higher dye loadings in the blend, or pure cyanine films, this process effectively reduces the hole transfer. Comparison between dye emission in an inert polystyrene matrix and the donor matrix allowed us to separate the influence of self-quenching and charge transfer mechanisms. Favorable photovoltaic bilayer performance, including high open-circuit voltages of B1 V confirmed the results from optical experiments. The characteristics of solar cells using different dyes also highlighted the need for balanced adjustment of the energy levels and their offsets at the heterojunction when using low-bandgap materials, and accentuated important effects of interface interactions and solid-state packing on charge generation and transport. IntroductionThe potential of cheap photovoltaics is fueling the interest in organic semiconductors. [1][2][3][4] State-of-the-art devices are made from a combination of electron-donor and electron-acceptor (D-A) materials, sandwiched between metallic electrodes. 5 Photoexcitation of either of the two components leads to an exciton that can dissociate into free charge carriers at the D-A interface. 6 After charge separation, electrons and holes are transported via drift and diffusion processes to the electrodes, where they are collected, giving rise to an electric current. 2 Device efficiency is determined by the short-circuit current (J sc ), the open-circuit voltage (V oc ), and the fill factor (FF) via Z = (J sc V oc FF)/P, where P is the incident optical power. The FF is a measure of the ability to transport and extract charges when the applied voltage approaches V oc ; J sc is determined by the fraction of absorbed photons from the incident sunlight as well as by the ability to create charges via exciton dissociation at the D-A interface. Consensus has now been reached that V oc correlates with the energy difference (E D ) between the highest occupied molecular orbital (HOMO) of the donor and the lowest unoccupied molecular orbital (LUMO) of the acceptor. [7][8][9] It follows that both J sc and V oc depend on the donor and acceptor energy levels and their offsets at the heterojunction (for illustration, see Fig. 1c). A high V oc requires a high E D . However, this implies that the HOMO-HOMO (E HH ) and LUMO-LUMO (E...

show abstract

The Theory of the Photographic Process

Cited by 163 publications

References 0 publications

Roles of flanking sequences in the binding between unimolecular parallel-stranded G-quadruplexes and ligands

Roles of flanking sequences in the binding between unimolecular parallel-stranded G-quadruplexes and ligands

Optical trigger based on the molecules of bacteriorhodopsin adsorbed on AgBr nanocrystals

Photoinduced hole-transfer in semiconducting polymer/low-bandgap cyanine dye blends: evidence for unit charge separation quantum yield

Contact Info

Product

Resources

About