The rate of passive transport depends on the permeability of the cell membrane, which, in turn, depends on the organization and characteristics of the membrane lipids and proteins. The four main kinds of passive transport are diffusion, facilitated diffusion, filtration and osmosis.
DEFINITION of 'Privately Owned'. A company that is not publicly traded on a securities exchange. The majority of companies are privately owned, usually by either one individual or by a small group of individuals. Although offering securities for sale to the public can be a good way to obtain large amounts of financing, public ownership requires considerable effort to ensure compliance with securities regulations.
A Limited Liability Company is a form of business that combines elements of both corporate structure and partnerships. It owns property like a company in the name of the LLC. Generally, an LLC owns real property that generates profits such as apartments, shopping malls or businesses. The owners are called members and each owns a share in the profits. Purchasers of property owned by an LLC will require a Certificate that confirms the legal existence of the LLC and a Certificate that identifies the member who is authorized to sign deeds. LLCs are treated differently under various state laws.