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 company whose securities are traded on a stock exchange and can be bought and sold by anyone. Public companies are strictly regulated, and are required by law to publish their complete and true financial position so that investors can determine the true worth of its stock (shares).Also called publicly held company.Public limited company and its abbreviation Plc are commonly used in the UK in the way that corporation and Inc. is used in the United States.lso called publicly held company. Public limited company and its abbreviation Plc are commonly used in the UK in the way that corporation and Inc. is used in the United States.