There is provided a cart for transporting dies, molds, and similar objects. The collar may include an opening that communicates with the interior of said bag and at least one panel that is movable to selectively obscure the opening. When specially prepared for competence, these strains are highly useful for both cloning and protein expression. On the other hand, if there are not enough processing resources to perform the job, and there are yet some remaining processing resources that are guaranteed to the certain entity, then one or more other jobs that are associated with other entities are at least partially preempted until there are enough processing resources to perform the processing job. As such, the coiling door is operable even under high wind load conditions for movement to and between closed positions because of the roller arrangement coupling the lateral side edges of the door to guides mounted along the sides of the door opening.