Abstract: An enzyme-linked immunosorbent assay (ELISA) method and a monoclonal antibody for giant panda relaxin-3 (RLN3) are provided. The method includes: conducting ELISA with an anti-giant panda RLN3 monoclonal antibody as a coating antibody and an anti-RLN3 polyclonal antibody as a labeling antibody, where the anti-giant panda RLN3 monoclonal antibody is secreted by a hybridoma cell line RLN-3; and the hybridoma cell line RLN-3 was deposited in the China Center for Type Culture Collection (CCTCC) of Wuhan University, Wuhan, China on Jan. 7, 2021, with an accession number of CCTCC NO: C202129. In addition, an ELISA method for detecting RLN3 in giant panda urine is developed, in which a prepared anti-giant panda RLN3 monoclonal antibody is used as a coating antibody and an anti-giant panda RLN3 polyclonal antibody is used as a labeling antibody. The method can monitor a change in giant panda RLN3 timely by determining giant panda RLN3.

Abstract: The invention provides a method of operating a fuel cell comprising a solid anion exchange membrane, the method comprising contacting an anode in the fuel cell with urea, ammonia or an ammonium salt and contacting the cathode with an oxidant whereby to generate electricity.

Abstract: A telescopic wrench extensioner includes a tubular member with a closed end portion that has a polygonal axial recess which is adapted to engage a socket wrench, and a shaft member having a first end slidably extending into the tubular member and a second end extending out of the tubular member and being provided with an axial socket operating portion that is polygonal in cross section and that is adapted to engage a wrench socket. The shaft member can be maintained at a selected position relative to the tubular member.