How to use alias for Textmate Rails projects

My ~/.bash_profile looks like this:

PATH="/usr/local/subversion/bin:$PATH"
PATH="/opt/local/bin:$PATH"
PATH="/usr/local/bin:/usr/local/sbin:/usr/local/mysql/bin:$PATH"
export PATH
PS1='\t:\w > '
export EDITOR='mate -w'
export JAVA_HOME=/usr
export MANPATH=$MANPATH:/opt/local/share/man
export INFOPATH=$INFOPATH:/opt/local/share/info

export atom="$HOME/work/atomizer"
export ard="$HOME/work/zepho/remote/trunk"
export astro="$HOME/clients/ge/astroceleb"
export star="$HOME/clients/ge/starstories"

alias matom="mate $atom"
alias mard="mate $ard"
alias mastro="mate $astro"
alias mstar="mate $star"
alias off="sudo shutdown -h now"

Example : matom opens the atomizer project.