Abstract: A front bumper of a vehicle is provided with a flexible display screen, such as a flexible LED display screen, supported by a screen positioning frame that matches the curvature of the front bumper, ensuring that the flexible display screen aligns perfectly with the curved surface of the front bumper. An electric color-changing protective panel may be provided to protect the display screen from road or environmental hazards, the protective panel having a color that, when powered-off, matches a color of the vehicle so as to conceal the display screen, and that becomes transparent when powered-on to reveal and allow viewing of the display screen.

Abstract: An extendable and retractable drop step positioned below a door of a vehicle to assist a person in climbing into the vehicle includes a power transmission mechanism for moving the drop step to and from an extended position, and a guiding arrangement for guiding the drop step along an inclined linear path from the retracted to the extended position. Loads on the extended step are borne by supports fixed to the vehicle, and not by the power transmission components. The step is extended and retracted along the inclined linear path in response to rotation of a motor shaft in a first direction to extend the step and rotation of the motor shaft in an opposite direction during retraction, ensure smooth and reliable operation. In addition, extension and retraction of the step can be controlled through a mobile app or Infotainment system interface, via an electronic control unit of the vehicle.

Abstract: The present disclosure provides an application method in rice callus differentiation based on an Oryza sativa Leafy Cotyledon 1 (OsLEC1) gene, including the steps of: selecting guide ribonucleic acid (gRNA) target sites; cloning tandem fragments including gRNA; ligating each gRNA fragment; performing polymerase chain reaction (PCR) amplification on a ligation product; performing enzyme digestion on the purified product and a target vector; transforming the ligated vector; performing Agrobacterium-mediated genetic transformation of rice; and screening and identifying transgenetic plants. In the present disclosure, the differentiation of callus directly affects the emergence efficiency of transgenic plants. The knockout of OsLEC1 can promote the differentiation of rice callus, suggesting that OsLEC1 can serve as an important target gene for improving the transformation efficiency of rice and even gramineous crops.

Abstract: An extendable and retractable drop step positioned below a door of a vehicle to assist a person in climbing into the vehicle includes a driving linkage mechanism for moving the drop step to and from an extended position, and a telescoping lateral support arm structure having left and right swing arms respectively connected at both ends to a main support and to sides of the drop step by universal joints that rotate and pivot in multiple directions so that the support arm structure bears loads on the step without interfering with a trajectory of the step determined by the driving linkage mechanism. An extended position of the step is defined by limit stops or positioning limiting mechanisms included in the support arm structure.

Abstract: A customizable, easy-to-install replacement bumper for vehicles includes an integral solar-powered display screen. To simplify replacement of the OEM front bumper, the replacement bumper includes openings, connection structures, and hardware configured to match those of an OEM bumper, so that the installer is not required to cut or drill holes in either the vehicle or the bumper.

Abstract: An extendable and retractable drop step positioned below a door of a vehicle to assist a person in climbing into the vehicle includes a power transmission mechanism for moving the drop step to and from an extended position, and a guiding arrangement for guiding the drop step along an inclined linear path from the retracted to the extended position. Loads on the extended step are borne by supports fixed to the vehicle, and not by the power transmission components. The step is extended and retracted along the inclined linear path in response to rotation of a motor shaft in a first direction to extend the step and rotation of the motor shaft in an opposite direction during retraction, ensure smooth and reliable operation. In addition, extension and retraction of the step can be controlled through a mobile app or Infotainment system interface, via an electronic control unit of the vehicle.