In general, molecules move from an area of higher concentration to an area of lower concentration. To get molecules into the cell "against" the concentration gradient, work must be done. The work is done in special proteins which act as ports in the cell membrane. The imports must come through the ports: they cannot get through the bilipid layer of the cell membrane.
There are three main types of protein ports in cell membranes:
Andreas Schockenhoff
Andreas Schockenhoff (February 23, 1957 – 13 December 2014) was a German politician of the CDU. From 1990 until his death in 2014, he served as a member of the German Bundestag. In the general election in 2013, he was elected the seventh consecutive year as a direct mandate for the federal electoral district Ravensburg in the German Bundestag. Schockenhoff was born in Ludwigsburg, Germany.
Schockenhoff died in Ravensburg, Germany, aged 57.
Joan Barril
Joan Barril i Cuixart (20 January 1952 – 13 December 2014) was a Spanish journalist and writer. He was born in Barcelona, Spain. He was known for his writing columns on "El País", "La Vanguardia" and in "El Periódico de Catalunya".
Barril died in Barcelona, Spain from pneumonia, aged 62.
David H. Gambrell
David Henry Gambrell (December 20, 1929 – May 6, 2021) was a American politician. Gambrell served in the United States Senate representing Georgia from 1971 through 1972. He was appointed to the Senate by President Jimmy Carter.
Gambrell died on May 6, 2021 in Atlanta, Georgia at the age of 91.
George A. Sinner
George Albert Sinner (May 19, 1928 – March 9, 2018) was an American politician. He served as the 29th Governor of North Dakota from 1985 through 1992. He served two four-year terms as governor.
Sinner died on March 9, 2018 in Fargo of pneumonia at the age of 89.
Caravan
A caravan may refer to:
Caravan (travellers)
A caravan (from ) is a group of people traveling together. Often they are on a trade expedition. Caravans were used mainly in desert areas and throughout the Silk Road. Traveling in groups aided in defense against bandits, in the same way that convoys at sea helped protect against piracy. It also helped improve economies of scale in trade. In the 14th century there were reports of caravans of up to 12,000 camels.
In historical times, caravans traveled across East Asia and Europe. They often carried luxurious and lucrative goods, such as silks or jewelry. They would trade these for salt, gold, copper or slaves. At first donkey carts were used. They were replaced with the single hump camel. The camel could go great distances on very little water.
Caravans could require a large investment in goods and camels. They were a rich target for bandits. The profits from a successful trade journey could be great. Many rulers along important trade routes created caravanserai (way stations). These were places where caravans could refresh their animals and supplies can be replenished. However, the volume a caravan could transport was limited. For example, a caravan of 500 camels could only transport as much as a third or half of the goods carried by a regular Byzantine merchant sailing ship.
Present-day caravans still transport important goods in less-developed areas of the world. Examples are the camel trains traversing the southern edges of the Sahara Desert. Also, modern caravans are often made up of cars, trucks and busses.
Flying University
Flying University (or "Floating University") was a counterculture educational activist group in Warsaw, Poland. They gathered in private apartments to teach history and the Polish language to students. The group operated for 20 years from 1885 to 1905. Warsaw was then under the control of the Russian Empire. Marie Curie became a student here after being banned from Warsaw University because of her sex.
Because I Said So
Because I Said So is a 2007 romantic comedy movie. The movie is about an overbearing mother who is concerned about her three daughters. Diane Keaton plays Daphne. Mandy Moore plays Milly. Piper Perabo plays Mae. Lauren Graham plays Maggie.
"Because I Said So" got negative reviews from critics. But it did very well at the box office. It took in more than $69 million against a $39 million budget.
Piper Perabo
Piper Perabo (born October 31, 1976) is an American actress. She acts in movies, television and on stage. In the movie "Whiteboyz", she played Sara. She played Violet "Jersey" Sanford in "Coyote Ugly".
Perabo was born in Dallas, Texas. She grew up in Toms River, New Jersey.
Lauren Graham
Lauren Graham (born March 16, 1967) is an American actress, producer and novelist. She played Lorelai Gilmore on "The Gilmore Girls". She played Sarah Braverman in the TV series "Parenthood".
Graham was born in Honolulu, Hawaii.
The Blue Meanie
Brian Daniel Heffron (born May 18, 1973) is an American professional wrestler and actor. He is better known by his ring name The Blue Meanie. He is best known for his time with Extreme Championship Wrestling (ECW) from 1995 to 2000 and World Wrestling Entertainment (WWE). Heffron's ring name is a reference to the Blue Meanies, the creatures from the 1968 movie, "Yellow Submarine".
In ECW, Heffron was known for his time in the Blue World Order, which was a parody of World Championship Wrestling (WCW)'s top heel group, the nWo. In the bWo, Meanie played a parody of nWo member Scott Hall and was named Da Blue Guy which was a parody of Scott Hall's nickname "The Bad Guy".
Eastcote
Eastcote is a suburban area in west London. (It was in Middlesex until the county was abolished in 1965). It is part of the London Borough of Hillingdon. In the Middle Ages, Eastcote was one of the three areas that made up the parish of Ruislip, under the name of Ascot. The name came from its position to the east of the parish. From the mid-17th century there were clusters of small hamlets in this area.
Monster Buster Club
Monster Buster Club is a children's comedy action animated television program series. It was created by Vincent Chalvon-Demersay and David Michel and by Marathon Media and Image Entertainment Corporation Inc. The series was first shown on TV in Europe on Jetix, June 2, 2008. In the United States it began on June 9, 2008. In Asia it started on May 3, 2008. The show was first shown on Canada's Television channel YTV in 2008. The series ended in 2009.
This show is about three twelve-year-olds, helped by an alien girl named Cathy, who are all charged with saving their town from alien invasions. With her grandfather, they reform a secret organization that was founded centuries ago called the Monster Buster Club, often abbreviated to MBC. The goal of the MBC is to locate alien criminals seeking refuge in Single Town, capture them, and send them to galactic authorities.
Mieszko II Lambert
Mieszko II Lambert (ca. 990 - May 10, 1034) was a king of Poland from 1025 to 1031, and a duke of Poland from 1032 to 1034 from the Piast dynasty. He was the second son of Boleslaw I the Brave. He is the third known Polish ruler. He was father of Casimir I.
He was probably named after Mieszko I of Poland, who was his grandfather.
In 1028 and in 1030 he attacked Saxony. Later, Poland was attacked by Germany, Bohemia, and Kiev. When Poland was attacked by Yaroslav the Wise in 1031, Mieszko lost control over Poland.
Self storage
Self storage is a place where rooms or spaces are rented to individuals and companies. These can very large rooms or outside spaces, or as small as a simple locker. These spaces are usually rented on a short term lease, or on a month by month basis.
A business may use self storage as a way to free up expensive office space to store company files, inventory, equipment, furniture and other items.
The person or business leasing the space is responsible for placing items inside. The storage company does not usually have access to the spaces.
The money spent on self storage in the USA was estimated to be $24 billion in 2013.
Walking stick