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Two variable flavor number schemes are used to describe bottom quarkproduction in deep inelastic electron-proton scattering. In these schemes thecoefficient functions are derived from mass factorization of the heavy quarkcoefficient functions presented in a fixed flavor number scheme. Also one hasto construct a parton density set with five light flavors (u,d,s,c,b) out of aset which only contains four light flavors (u,d,s,c). In order $\alpha_s^2$ thetwo sets are discontinuous at $\mu=m_b$ which follows from mass factorizationof the heavy quark coefficient functions when it is carried out in the ${\bar{\rm MS}}$-scheme. Both variable flavor number schemes give almost identicalpredictions for the bottom structure functions $F_{2,b}$ and $F_{L,b}$. Alsothey both agree well with the corresponding results based on fixed orderfour-flavor perturbation theory over a wide range in $x$ and $Q^2$.Comment: Latex with seventeen PostScript figure

Bottom quark electroproduction in variable flavor number schemes