Abstract: The invention provides methods and compositions for removal of undesired or excess oligonucleotides from reaction mixtures using a double hairpin nucleic acid comprising a single nucleic acid strand having: i. a first hairpin at the 5?-end; ii. a second hairpin at the 3?-end; and iii. a single-stranded region between the 5?-end and the 3?-end, wherein the single-stranded region comprises a sequence capable of hybridizing to the oligonucleotide to be removed, e.g, excess primers, subcodes or adaptor molecules.

Abstract: An apparatus, method and system are disclosed operable with any mobile communication device such as mobile phone, tablet, electronic watch or any other portable device and providing a self-defense capability to a user by dispensing a liquid or fluid or gas or powder such as but not limited to pepper spray, tear gas, powder or the like at a potential attacker in response to the user depressing one or more pre-configured virtual or physical controls provided on his/her mobile communication device, having a case or enclosure which partially envelopes a canister of pepperspray or any other similar compound for personal protection. The system enables a citizen to seek police/emergency aid while moving in vehicles etc. The system enables keeping of text/audio/video/images record including location of such emergency events and generates a case summary of the emergency situation with recovery actions performed.