Abstract: A fishing rod holder for a boat includes a support base and a fishing rod holder. One end of the support base in a longitudinal direction is provided with a first installation position, and one end of the support base in a transverse direction is provided with a second installation position. The first installation position and the second installation position are different positions. The fishing rod holder is detachably installed on the first installation position and the second installation position. The support base is capable of being installed on a support platform. By providing two installation positions on the support base, a height of the fishing rod holder can be adjusted, and the support base can also be detachably installed on the support platform. The support platform can be a circular tube, a square tube, a flat surface, and some irregular objects.

Abstract: The present disclosure provides compounds and the preparation methods, lipid nanoparticles, and pharmaceutical compositions thereof. The compound includes at least one structural formula (I-1) and may be provided as a pharmaceutically acceptable salt, prodrug, or isomer. The compounds of the present disclosure increase structural diversity among lipid molecules. The structure of the compounds directly provides biodegradablity. The L1a, L1b, and L1c groups in the compounds can be interchanged with the L2 group, enabling the integration of other molecules such as steroids and peptides for direct and fast screening. This interchangeability expands the functionality of the cationic lipid compounds, allowing for the direct coupling of functional molecules to the lipid compound to expand its functions. The replaceable L groups offer greater flexibility in selecting L1a, L1b, L1c, and L2.