  We discuss two-parameter deformations of an universal enveloping algebra
$U(g[u])$ of a polynomial loop algebra $g[u]$, where $g$ is a
finite-dimensional complex simple Lie algebra (or superalgebra). These
deformations are Hopf algebras. One deformation called Drinfeldian is a
quantization of $U(g[u])$ in the direction of a classical r-matrix which is a
sum of the simplest rational and trigonometric r-matrices. Another deformation
(discussed only for the case $g=sl_{2}$) is a twisting of the usual Yangian
$Y_{\eta}(sl_{2})$.
