Hyaluronic Acid with Double Helix Ion Channels for Efficient Electrolyte Retention and Polysulfide Regulation in Lean-Electrolyte Lithium-Sulfur Batteries.

Catalyzing sulfur conversion is an efficient solution to overcome poor ion transfer, severe shuttle effect, and unfavored electrode passivation in lean-electrolyte lithium-sulfur batteries. Herein, a natural moisturizing material, hyaluronic acid (HA), is experimentally and theoretically demonstrated to promote the adsorptions of electrolyte and polysulfides via intramolecular hydrogen bonds, providing sufficient electrolyte contacts for subsequent catalytic reactions. Rely on its radical-scavenging capability, HA facilitates the conversion of polysulfide radicals at N sites, suppressing shuttle effect.

Mimicking the Peptidyl Enzyme Enables Polysulfide Electronic Axial Stretching Catalysis for Lean-Electrolyte Lithium-Sulfur Batteries.

Catalysts are effective in mitigating slow sulfur redox reaction (SRR) kinetics in lithium-sulfur (Li-S) batteries. However, ideal battery performance has yet to be achieved under lean-electrolyte conditions due to the massive accumulation of lithium polysulfides in the electrolyte aggravating low ionic conductivity, increased electrolyte viscosity, and sluggish reaction kinetics. Inspired by the thrombolytic and microcirculation improvement functions of peptidyl nattokinase (NK) enzymes, herein, NK and its peptidyl mimicry enzyme (i.

Ninety percent circular polarization detected in a repeating fast radio burst.

Fast radio bursts (FRBs) are extra-galactic sources with unknown physical mechanisms. They emit millisecond-duration radio pulses with isotropic equivalent energy of [Formula: see text]-[Formula: see text] ergs. This corresponds to a brightness temperature of FRB emission typically reaching the level of [Formula: see text] K, but can be as high as above [Formula: see text] K for sub-microsecond timescale structures, suggesting the presence of underlying coherent relativistic radiation mechanisms.

Fine Particulate Matter () and the Blood-Testis Barrier: An and Mechanistic Study.

Background: Fine particulate matter [particulate matter (PM) with aerodynamic diameter of ()] is considered a major component of ambient PM. Exposure to was shown to be associated with male reproductive system injury. Ferroptosis is regarded as an iron-dependent programmed cell death that is associated with the pathological process.

Adverse effects and potential mechanisms of polystyrene microplastics (PS-MPs) on the blood-testis barrier.

Microplastics (MPs) are defined as plastic particles or fragments with a diameter of less than 5 mm. These particles have been identified as causing male reproductive toxicity, although the precise mechanism behind this association is yet to be fully understood. Recent research has found that exposure to polystyrene microplastics (PS-MPs) can disrupt spermatogenesis by impacting the integrity of the blood-testis barrier (BTB), a formidable barrier within mammalian blood tissues.

A radio pulsar phase from SGR J1935+2154 provides clues to the magnetar FRB mechanism.

The megajansky radio burst, FRB 20200428, and other bright radio bursts detected from the Galactic source SGR J1935+2154 suggest that magnetars can make fast radio bursts (FRBs), but the emission site and mechanism of FRB-like bursts are still unidentified. Here, we report the emergence of a radio pulsar phase of the magnetar 5 months after FRB 20200428. Pulses were detected in 16.

Frequency-dependent polarization of repeating fast radio bursts-implications for their origin.

The polarization of fast radio bursts (FRBs), which are bright astronomical transient phenomena, contains information about their environments. Using wide-band observations with two telescopes, we report polarization measurements of five repeating FRBs and find a trend of lower polarization at lower frequencies. This behavior is modeled as multipath scattering, characterized by a single parameter, σ, the rotation measure (RM) scatter.