Each of these concentrations is dependent upon the bacterial strain being targeted. The second rash typically is due to infection by a different Borrelia strain. This causes further strain in the family. The tetrahedral arrangement results in ring strain and instability. The presence of dislocation results in lattice strain (distortion). Generally cells derived from strain 129 are used. It originated from a mutation in wild ducks combining with a pre-existing human strain. He increasingly resorted to drink to cope with the strain. Immunity appears to be largely strain specific. Outcrossing is a way of bringing fresh blood into the white strain. This depends on the particular strain of the breed. The genome of the H37Rv strain was published in 1998. Refugee settlement was a considerable economic strain. Diamond is notorious for having a relatively large lattice strain. This compares with a maximum strain for conventional steels.