A new cassane diterpenoid from the seed of .

In this study, a previously undescribed cassane diterpenoid, named caesalpinin JF (), along with two known cassane diterpenoids caesanine C () and tomocinol B (), was isolated from 95% EtOH extract of the seeds of Linn. Additionally, three known compounds including pulcherrin R (), syringaresinol-4'---D-glucopyranoside () and kaempferol () were also identified. The structures of the isolated compounds were elucidated by comprehensive 1D and 2D NMR spectroscopic analyses.

Two new cassane diterpenoids from the seed kernels of .

Two new cassane diterpenoids, sucupiranin MN () and sucupiranin ML (), together with two known compounds sucutinirane C () and deacetylsucutinirane C () were isolated from the seed kernels of . Their structures were elucidated by means of analysis of comprehensive spectroscopic data, especially HRESIMS and 1D/2D NMR spectroscopy. Compounds are typical furan-type cassane derivatives with an aromatized C ring.

Single-Atom Mn Catalysts via Integration with Mn Sub Nano-Clusters Synergistically Enhance Oxygen Reduction Reaction.

Integrating single atoms and clusters into one system represents a novel strategy for achieving the desired catalytic performance. In comparison to single-atom catalysts, catalysts combining single atoms and clusters harness the advantages of both, thus displaying greater potential. Nevertheless, constructing single-atom-cluster systems remains challenging, and the fundamental mechanism for enhancing catalytic activity remains elusive.

"Polyoxometalate electron sponge" induces the accurate regulation of electron states at Ni sites to enhance oxidation of water.

Because of their special features, NiFe-LDHs (nickel iron layered double hydroxides) are prospective OER (oxygen evolution reaction) catalysts that might be utilized to catalyse the electrolysis of water and produce hydrogen to address the energy crisis. In this work, the electronic structure and electrocatalytic performance of the NiFe-LDH were accurately regulated by optimizing the Ni sites, which was enabled by adjacent metal sites coordinated with the "polyoxometalate electron sponge". With extension of the modification time, the Ni 2p binding energy, the Ni/Ni ratio and the OER properties were gradually tuned, which indicated accurate regulation of active Ni sites by the "polyoxometalate electron sponge" on a temporal scale.

ECG Utilization Patterns of Patients With Arrhythmias During COVID-19 Epidemic and Post-SARS-CoV-2 Eras in Shanghai, China.

Background: The COVID-19 pandemic has led to concerns around its subsequent impact on global health.

Objective: To investigate the health-seeking behavior, reflected by ECG utilization patterns, of patients with non-COVID-19 diseases during and after COVID-19 epidemic.

Methods: Taking advantage of the remote ECG system covering 278 medical institutions throughout Shanghai, the numbers of medical visits with ECG examinations during the lockdown (between January 23 and April 7, 2020), post-lockdown (between April 8 and December 31, 2020) and post-SARS-CoV-2 (between January 23 and April 7, 2021) periods were analyzed and compared against those during the same periods of the preceding years (2018 and 2019).

Epidemiology of Atrial Fibrillation and Related Myocardial Ischemia or Arrhythmia Events in Chinese Community Population in 2019.

Background: Atrial fibrillation (AF) is the most common arrhythmia, and the incidence increases rapidly all over the world. The global prevalence of AF (age-adjusted) is 0.60% for men and 0.

Optimization of ultrasonic-microwave assisted alkali extraction of arabinoxylan from the corn bran using response surface methodology.

In this study, Ultrasonic-Microwave assisted alkali (UMAA) was applied to extract water-unextractable arabinoxylan (WUAX) from the corn bran. The various factors including ultrasonic power, concentration of sodium hydroxide, solvent-to-material ratio and ultrasonic-microwave synergetic time were optimized by response surface methodology coupled with Box-Behnken design (BBD) on basis of the results of single factor experiments. The results showed that the maximum WUAX yield of 27.