41. The oxalates are converted to oxides by annealing . 42. A simple algorithm simulated annealing yields good results with relatively good performance. 43. The temperature is gradually lowered according to the " annealing schedule ". 44. The earliest steps of a touchdown polymerase chain reaction cycle have high annealing temperatures. 45. Pyroxferroite can also be produced by annealing synthetic clinopyroxene at high pressures and temperatures. 46. Carbon also causes annealing the steel in a decarburizing atmosphere, such as hydrogen. 47. The annealing temperature during a polymerase chain reaction determines the specificity of primer annealing. 48. The annealing temperature during a polymerase chain reaction determines the specificity of primer annealing . 49. This activity is needed during a single-strand annealing subpathway of homologous recombination. 50. Simulated annealing is closely related to graduated optimization.