The Membrane essays

The Membrane essays The membrane has a double lipid layer through which fat- soluble substances will move, by passive transport or diffusion. The molecules will only move through if they are small enough. There are globular protein regions, which are hydrophilic. These regions allow water and water soluble substances through, but only if they are small enough, for example starch grains are too big. These substances move through by passive transport or diffusion. Diffusion is the passive movement of substances from a high concentration to a low concentration ( N.B., you don't need a membrane present, e.g. diffusion occurs in the air). In CONTRAST, diffusion of water across a semi- permeable membrane is called OSMOSIS. Active transport requires energy from ATP, and involves carrier molecules studding the membranes. The carrier combines with the molecule on the outside, which requires ATP. It then moves across, (which also requires ATP), and returns. An example is glucose being transported by active transport by insulin. Why is it called the Fluid Mosaic Model? Fluid- it is called a fluid because proteins are said to wander through the membrane (hence fluid) Mosaic- it is a mosaic because it is a collection (or mosaic) of structures Model- because no matter how real the diagram looks, it is not real. Therefore, it is a model. SO you put all three bits together and you get. FLUID MOSAIC MODEL! YAY!!!!!! ...

Benjamin Tucker Tanner

Benjamin Tucker Tanner Overview Benjamin Tucker Tanner  was a prominent figure in the African Methodist Episcopal (AME)  Church  . As a clergyman and news editor, Tucker played a pivotal role in the lives of African-Americans as the Jim Crow Era became a reality. Throughout his career as a religious leader, Tucker integrated the importance of social and political power with fighting racial inequality.   Early Life and Education Tanner was born on December 25, 1835 in Pittsburgh to Hugh and Isabella Tanner. At the age of 17, Tanner became a student at Avery College. By 1856, Tanner had joined the AME Church and continued to further his education at Western Theological Seminary. While a seminary student, Tanner received his license to preach in the AME Church. While studying at Avery College, Tanner met and married Sarah Elizabeth Miller, a former slave who had escaped on the Underground Railroad. Through their union, the couple had four children, including Halle Tanner Dillon Johnson, one of the first African-American women to become a physician in the United States and Henry Osawa Tanner, the most distinguished African-American artist of the 19th Century. In 1860, Tanner graduated from Western Theological Seminary with a pastoral certificate.   Within two years, he established an AME Church in Washington D.C. Benjamin Tucker Tanner: AME Minister and Bishop While serving as a minister, Tanner established the United States first school for freed African-Americans in the United States Navy Yard in Washington D.C. Several years later, he supervised freedmans schools in Frederick County, Maryland. During this time, he also published his first book, An Apology for African Methodism in 1867. Elected Secretary of the AME General Conference in 1868, Tanner was also named editor of Christian Recorder. The Christian Recorder soon became the largest circulating African-American newspapers in the United States. By 1878, Tanner received his Doctor of Divinity degree from Wilberforce College.   Soon after, Tanner published his book, Outline and Government of the AME Church and was appointed editor of the newly established AME newspaper, AME Church Review. In 1888, Tanner became a bishop of the AME Church. Death Tanner died on January 14, 1923 in Washington D.C.