Abstract: A toilet plunger is used to unclog a drain of a toilet by removing impurities. The toilet plunger includes a gas container, with an opening thereof closed by a closing plate. A body has defined therein a passage extending in the lengthwise direction to allow gas to pass through and a gas container-receiving portion. A puncture pin is disposed in the central portion of the gas container-receiving portion. A cover has an inner space for receiving a portion of the gas container opposite the opening. The cover is screw-coupled to the upper portion of the body, such that the container is moved toward the puncture pin according to a screw motion. An insert is connected to the lower end of the body to guide the discharged gas along the passage toward the drain. A portion of the insert, which is intermediate in length, is bent in one direction.

Abstract: Methods and compositions are provided for producing nucleic acid-based compositions. Methods include enzyme catalyzed or nucleic acid polymer conjugation. Compositions include nucleic acid-containing hydrogels which can be elongated via rolling circle amplification. The hydrogels can encapsulate bioactive agents for drug delivery.

Abstract: Compositions and methods are provided for constructing multi-functional nucleic acid nano-structures. Nano-structures are provided incorporating a built-in modularity, including nucleic acid modules. Modules contain moieties including detectible labels, nanoparticles, reactive moieties and other functional groups. Nano-structures can be used for delivery of target compounds, as well as identification of target nucleic acid molecules.

Abstract: A printed circuit board (PCB) assembly is disclosed, which includes a first PCB on which a plurality of first electrode terminals are arranged at intervals from one another; a second PCB on which a plurality of second electrode terminals respectively connected with the first electrode terminals are arranged at intervals from one another; and separation preventing member which prevents the first and the second electrode terminals from deviating from their correct positions when the first and the second electrode terminals are ultrasonically-welded to each other. Accordingly, lateral movement of the first and the second PCBs relative to each other is restricted owing to the separation preventing member, the plurality of first electrode terminals and second electrode terminals can be bonded to each other without deviating from their correct positions.

Abstract: A mounting structure of a steering column for a vehicle is provided with a column mounting bracket coupling the steering column to a cowl cross-member. A pedal bracket is coupled to a dash panel of the vehicle and a contact prevention part is provided at the column mounting bracket so that contact between an inner end of the pedal bracket and the column mounting bracket is minimized. Therefore, injuries to a driver and noise from vibration are minimized along with an increase in workability in manufacturing and assembly of the pedal structure.

Abstract: This invention relates to a copolymer for the manufacture of chemical amplified photoresist and a chemical amplified positive photoresist composition comprising a copolymer for the manufacture of chemical amplified photoresist as a base resin, as represented by the following formula 1, an acid generator and additive, Wherein, R1, R2, R3 and R4 are independently a hydrogen atom or a lower alkyl group; R5, R6, R7 and R8 are a hydrogen atom, an alkyl group of C1-8, an alkoxy group, an alkoxycarbonyl group or a halogen atom; h and i are independently an integer of 0-8; k, l, m and n represent an integer of element units provided that 0.3<k/(k+l+m+n)<0.9, 0≦l/(k+l+m+n)<0.6, 0≦m/(k+l+m+n)<0.6, and 0.01<n/(k+l+m+n)<0.