All-angle unidirectional flat-band acoustic metasurfaces.

Flat bands have empowered novel phenomena such as robust canalization with strong localization, high-collimation and low-loss propagation. However, the spatial symmetry protection in photonic or acoustic lattices naturally forces flat bands to manifest in pairs aligned at an inherently specific angle, resulting in a fixed bidirectional canalization. Here, we report an acoustic flat-band metasurface, allowing not only unidirectional canalization at all in-plane angles but also robust tunability in band alignment.

Time-varying 3D optical torque via a single beam.

The spin angular momentum (SAM) plays a significant role in light-matter interactions. It is well known that light carrying SAM can exert optical torques on micro-objects and drive rotations, but 3D rotation around an arbitrary axis remains challenging. Here, we demonstrate full control of the 3D optical torque acting on a trapped microparticle by tailoring the vectorial SAM transfer.

Extensive homologous recombination safeguards oocyte genome integrity in mammals.

Meiosis in mammalian oocytes is interrupted by a prolonged arrest at the germinal vesicle stage, during which oocytes have to repair DNA lesions to ensure genome integrity or otherwise undergo apoptosis. The FIRRM/FLIP-FIGNL1 complex dissociates RAD51 from the joint DNA molecules in both homologous recombination (HR) and DNA replication. However, as a type of non-meiotic, non-replicative cells, whether this RAD51-dismantling mechanism regulates genome integrity in oocytes remains elusive.

The Identification and Characterization of the Gene Family in Oliv. Heteromorphic Leaves Provide a Theoretical Basis for the Functional Study of .

Oliv. typically has four kinds of heteromorphic leaves: linear (Li), lanceolate (La), ovate (Ov) and broad ovate (Bo). Heteromorphic leaves help adapt to extreme desert environments and further contribute to protection against land desertification in Northwest China.