  The recent discovery of a new population of stars exhibiting unusual
elemental abundance patterns characterized by enhanced Ti to Ga elements and
low alpha and n-capture elements suggests the contribution of a new class of
supernovae, probably a kind of Type Ia supernovae associated with close binary
evolution. The role of these supernovae in chemical evolution is negligible in
normal galaxies that undergo moderate star formation such as our own. Thus,
while the frequency of occurrence would be too low to detect in low-redshift
galaxies, it may represent a prominent population in high-redshift objects such
as early epoch massive elliptical galaxies and QSOs. The chemical contributor
of this proposed type of supernovae in combination with recognized supernovae
is shown to be compatible with the recent observational features in the distant
universe, successfully reproducing the Type II supernovae-like abundance
pattern with enhancement of Ga and Ge in the gas of newborn massive galaxies
and high iron abundances in QSOs even at redshifts of around 6.
