Hierarchical chirality observed from chiral supramolecular assembling of racemic and enantiopure helicene derivatives on silica nanohelix surfaces.

Cast films of racemic helicene derivatives adsorbed onto the surface of nanometric silica helices with controlled handedness exhibited distinct CD signals, whereas no CD signal was observed in the absence of silica nanohelices. These CD signals originate from the helical supramolecular assemblies formed by the racemic mixture of helicenes, with no evidence of enantiospecific adsorption. Interestingly, when enantiomerically pure forms of these helicenes were drop-cast onto the silica helices, different CD spectra were observed depending on the combination of the helicenes' handedness with that of the silica nanohelices.

Porphyrin J-aggregates as a probe for chiral impurities as demonstrated by their symmetry breaking by confinement in montmorillonite clay.

In this paper, we demonstrate that chiral J-aggregates of porphyrins are able to detect minute chiral impurities, in this case, the presence of right-handed quartz in acid-activated K10 montmorillonite clay. Aggregation and symmetry breaking of 5,10,15,20-(tetra-4-carboxyphenyl) porphyrin (TCPP) and 5,10,15,20-(tetra-4-sulfonatophenyl) porphyrin (TPPS) were observed upon interaction with acid-activated montmorillonite clay (MMT-K10). A panel of characterization techniques, including UV-visible, electronic circular dichroism, IR, and vibrational circular dichroism spectroscopies, as well as X-ray scattering, were employed to investigate the aggregation of the confined TPPS and TCPP.

Impact of Orthopedic Surgical Intervention on Difficult-to-Treat Rheumatoid Arthritis: A Propensity Score Matched Study.

Objective: To elucidate the therapeutic effect of orthopedic surgical intervention (OSI) in difficult-to-treat rheumatoid arthritis (D2T RA) compared with non-D2T RA.

Methods: A total of 534 recent surgeries were analyzed only in patients who had undergone OSI since 2016 and for whom a 12-month post-operative follow-up was available. D2T RA was determined according to the EULAR definition, and patients with D2T RA were matched to patients with non-D2T RA using propensity scores calculated by a logistic regression analysis.

The value of the dynamic changes in cardiac power output in aortic stenosis patients following transcatheter aortic valve implantation: an exercise stress echocardiography study.

Aims: Evidence for risk stratification using exercise stress echocardiography (ESE) in patients undergoing transcatheter aortic valve implantation (TAVI) for severe aortic stenosis (AS) is currently lacking. Cardiac power output (CPO) has demonstrated prognostic value in patients undergoing TAVI for severe AS. This study investigated prognoses in patients undergoing TAVI for severe AS and to explore the additional information that ESE can provide for risk stratification.