Formation of the molecular complexes between meso-tetraphenylporphyrin (TPP) and the p-acceptors 2,3-dichloro-5,6-dicyanobenzoquinone (DDQ) and tetracyanothylene (TCNE) in chloroform solution was investigated spectrophotometrically. The formation constants of the resulting 1:1 molecular complexes were determined using the Benesi-Hildebrand and Nash methods. The TPP-DDQ pro...

introduction: pulmonary embolism (pe) is a common lethal disease that its clinical symptoms may be seen in many other diseases. computed tomography pulmonary angiography (ctpa) is a valuable diagnostic modality for detection of pe. in addition, it can accurately detect the other diseases with clinical symptoms similar to pe. the aim of this study is to evaluate the frequency of pe and nonemboli...

in present pet/ct scanners, pet attenuation correction is performed by relying on the information given by ct scan. in the ct-based attenuation correction methods, dual-energy technique (dect) is the most accurate approach, which has been limited due to the increasing patient dose. in this feasibility study, we have introduced a new method that can implement dual-energy technique with only a si...

Materials with intense near-infrared (NIR) absorption, especially electron acceptors, play crucial roles in the development of organic solar cells (OSCs) due to their capability harvesting low-energy photons enable high photocurrent. Herein, NIR nonfullerene acceptors (NFAs) are focused by briefly reviewing understand molecular design strategies, structure–property–performance relationships, an...

Background: The COVID-19 pandemic has had an impact on family planning programs. government made a new policy to limit services during the pandemic. As result, there is decrease in participation, causing high risk of increase number pregnancies and explosion birth rate. Utilization health good perception can compliance acceptors. Objective: This study aims determine relationship between utiliza...

Coumarin analogues were synthezised and evaluated as acceptors for the intrinsic fluorescence resonance energy transfer (iFRET) of tryptophan residues in target proteins. The fluorescence properties such as quantum yields, iFRET efficiencies, and Förster distances of the prepared coumarin analogs were determined in a model system, by their conjugation to biotin, utilizing streptavidin (SAV) as ...

In isolated chloroplasts exogenous low potential electron acceptors, such as methyl viologen (MV), have been used to study the chloroplast electron transport involving photosystem I. The reduction of acceptors and their consequent autoxidation [I] can most easily be followed polarographically by the uptake of 0:. The reactions which are believed to occur [2,3] when two electrons are transferred...

Triplet-exciton formation through intersystem crossing of photogenerated singlet excitons in fullerene acceptors can compete with charge generation in organic photovoltaic diodes. This article reports the intersystem crossing timescale (τISC ) of the most commonly used fullerene acceptors, PC60 BM and PC70 BM, in solutions and in spin-coated films. These times are on the nanosecond timescale, a...

The electronic spectra of 2-bromoethylbenzene and its chloro and fluoro analogues have been recorded by resonant two-photon ionisation (R2PI) spectroscopy. Anti and gauche conformers have been assigned by rotational band contour analysis and IR-UV ion depletion spectroscopy in the CH region. Hydrate clusters of the anti conformers have also been observed, allowing the role of halocarbons as hyd...