We study the single-molecule
transport properties of small bandgap
diketopyrrolopyrrole oligomers (DPPn, n = 1–4) with lengths varying from 1 to 5 nm. At a low bias
voltage, the conductance decays exponentially as a function of length
indicative of nonresonant transport. However, at a high bias voltage,
we observe a remarkably high conductance close to 10–2 G0 with currents reaching over 0.1 μA across all
four oligomers. These unique transport properties, together with density
functional theory-based transport calculations, suggest a mechanism
of resonant transport across the highly delocalized DPP backbones
in the high bias regime. This study thus demonstrates the unique properties
of diketopyrrolopyrrole derivatives in achieving highly efficient
long-range charge transport in single-molecule devices.
We report an extended x-ray absorption fine-structure investigation on the Mn K absorption edge in La 1−x Ca x MnO 3 as a function of temperature and magnetic field. The results provide microscopic evidence that the modifications in the local structure around Mn atomic sites, as a function of temperature and applied magnetic field, are directly related to the magneto-transport properties of these materials.
Polyphenols are natural plant compounds and are the most abundant antioxidants in the human diet. As the gastrointestinal tract is the primary organ provided to diet sections, the diet may be regarded as one of the essential factors in the functionality, integrity, and composition of intestinal microbiota. In the gastrointestinal tract, many polyphenols remain unabsorbed and may accumulate in the large intestine, where the intestinal microbiota are most widely metabolized. When assuming primary roles for promoting host well-being, this intestinal health environment is presented to the effect of external influences, including dietary patterns. A few different methodologies have been developed to increase solvency and transport across the gastrointestinal tract and move it to targeted intestinal regions to resolve dietary polyphenols at the low bioavailability. Polyphenols form a fascinating community among the different nutritional substances, as some of them have been found to have critical biological activities that include antioxidant, antimicrobial, or anticarcinogenic activities. Besides, it affects metabolism and immunity of the intestines and has anti-inflammatory properties. The well-being status of subjects can also benefit from the development of bioactive polyphenol-determined metabolites, although the mechanisms have not been identified. Even though the incredible variety of health-advancing activities of dietary polyphenols has been widely studied, their effect on intestinal biology adaptation, and two-way relationship between polyphenols and microbiota is still poorly understood. We focused on results of polyphenols in diet with biological activities, gut ecology, and the influence of their proportional links on human well-being and disease in this study.
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