Baruj Benacerraf Discovered the Major Histocompatibility Complex
1920 Caracas, Venezuela
Everyone wants to fit in with their friends, to wear the same “look,” to listen to the same types of music, to watch the same movies. Yet, we all know we're individuals as well, each a unique person. That uniqueness also applies to the surface of cells in a human body, which are unique to each individual. A Venezuelan immunologist named Baruj Benacerraf demonstrated in the early 1960s that these cell surfaces are subject to coding by genes. This coding designates which of the major histocompatibility antigens, also known as H antigens for short, are present on the cell surface. H antigens function as kind of a boy-girl dating mechanism. It determines if two cells can join hands and co-exist side by side, or break up. Dr. Benacerraf's studies helped scientists understand how cells make use of H antigens, which help the body’s immune system tell self from non-self. This becomes very important in organ transplantation. Benacerraf received the Nobel Prize for Physiology or Medicine in 1980 based on his work with H antigens.
Nobel Prize cite
Jewish Virtual Library entry
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Elizabeth Blackburn Discovered Telomerase
November 26, 1948 Hobart, Tasmania, Australia
You may have heard of the old practical joke at school, where someone might bring in, say, a worm to give as a “gift” to someone, with the idea of shocking their classmate. Worms do make many people squeamish, but they have performed a valuable role in science. One study of worms indicates that by lengthening the telomere of the worm, the worm lives longer. A telomere is the end part of a chromosome, like the cap of a pen or the tip of a shoelace. Itt was discovered by Elizabeth Blackburn, working with colleagues Carol Greider and Jack Szostak in 1978. The hope of such research is that, by applying an enzyme called telomerase (also discovered by Blackburn, Greider and Szostak) to the cells of humans, the telomeres of those human cells will stop shortening, thus the cells will stop aging, and perhaps people will stop aging as well. So far, only the worms have showed such a positive correlation. On the other hand, cells which can reproduce continuously raises the danger of cancer. Blackburn herself earned a premier spot on President George W. Bush's Council on Bioethics in 2001, but was forced off that body after her disagreement with the policy which prohibited studies on human embryonic stem cells. Blackburn had also been a critic of female discrimination in the sciences, including scientific institutions not making allowances for women who have young children. Along with Greider and Szostak, Blackburn was the recipient of the 2009 Nobel Prize for Physiology or Medicine for her work on telomeres.
New England Journal of Medicine reference
MIT Press entry
Wikipedia - Telomere
Wikipedia entry
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Denis Burkitt Discovered Burkitt's Lymphoma
February 28, 1911 – March 23, 1993 Enniskillen, County Fermanagh, Ireland
Today, we all agree it is good to follow a budget. One scientist who really knew how to stretch a dollar, or, rather, an English pound, was Denis Burkitt. As a boy Burkitt lost an eye, but he still grew up to become a one-eyed surgeon! In 1957, the Irish surgeon spent 25 pounds, equivalent to about $300 US dollars today, to print a survey for hospitals in Africa. That research was undertaken to uncover information about the incidence of a jaw tumor that was seen predominantly in Africans. Using the results of the survey, and his love of Geography, Burkitt mapped out the cases and discovered that the cancer was predominantly in areas where there was a high population of mosquitoes. Another scientist, Tony Epstein, was present at lecture where Burkitt outlined his study. Epstein also saw a correlation between geography, climate, and a virus which was later named Epstein-Barr after Dr. Epstein. Subsequent findings noted that mosquitoes were bearers of malaria, which acted to diminish immune responses in children, and then the virus could take hold and cause the tumor. The disease was named Burkitt’s lymphoma after Denis Burkitt and the kind of cancer the virus caused. This was the first human cancer where a viral cause was found. Burkitt tried chemotherapy after surgical solutions didn’t work. To his delight, he found that the tumors were very responsive to chemotherapy. He was one of the first researchers to discover both a cause and a cure for a disease. Burkitt accomplished a lot in his life and was also the President of the Christian Medical Fellowship.
New York Times reference
Wikipedia entry
Surgeons News source
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Gerty Cori Discovered How the Body Breaks Down Glycogen for Energy
August 15, 1896 – October 26, 1957 Prague, Austrian Empire (now the Czech Republic)
Most of us have ridden a bicycle, or used an exercycle, but what we may not have known is that our bodies were following the Cori Cycle during those workouts. The Cori Cycle is named after Gerty Cori, the first American female recipient of the Nobel Prize for Physiology or Medicine. Gerty made this research breakthrough along with her husband, Carl, and Argentine colleague, Bernardo Houssay, in 1929. The Cori Cycle describes how energy moves within the body, breaking down glycogen in muscle into lactic acid and then resynthesizing it and storing it as a source of energy. Gerty Cori worked intently studying the interaction between sugars and insulin as well. Cori faced discrimination throughout her life. She was born Jewish, and although she converted to Catholicism, the anti-Semitism that existed in central Europe between the World Wars still bothered her. In the United States, she faced sexism. At one point, she was offered a research position that paid her only 1/10th the income her husband received. She was also told that it was “un-American” for a husband and wife to work together. Despite these obstacles, Cori went on to achieve significant honors, including an appointment by President Truman to the board of the National Science Foundation. There's even a crater on the Moon named after her, as well as a postage stamp.
Nobel Prize reference
Jewish Virtual Library cite
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Francis Crick
Discovered the Famous Double Helix!
June 8, 1916 – July 28, 2004 Weston Favell, Northamptonshire, England
Strangeways, Drawbridge, Central dogma, The Golden Helix. Are these scenes and terms from the next Harry Potter movie, perhaps? No, they're actually places and ideas surrounding a real life scientific wizard, Francis Crick. Crick was part of a team of researchers, along with James Watson, who discovered the DNA Double Helix in 1953. The Double Helix is a crucial keystone in unlocking the secrets to the genetic code. Strangeways Research Laboratory in Cambridge, England, is one location where Crick carried out his studies. Drawbridge is the middle name of Crick's grandfather. “Central dogma” relates to a postulate put forward by Crick that proteins are created and directed by information originating in DNA, which then transmit instructions for the proteins via RNA. The Golden Helix is the name for the house Crick lived in, with his family. Crick, along with Watson and another scientist Maurice Wilkins, was awarded the Nobel Prize for Physiology or Medicine in 1962. There are scientists and researchers that think the prize for the breakthrough involving the Double Helix should also have included Rosalind Franklin, whose X-Ray Diffraction was essential in the development of the Francis-Crick DNA model.
Nobel Price entry
Guardian link
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Peter Doherty Discovered the Major Histocompatibility Complex
October 15, 1940 Brisbane, Australia
Television has a program called CSI, where investigators inspect murders to search for clues on the culprit. Scientist Peter Doherty was involved in “pig CSI”: He was a veterinarian who studied what caused the deaths of pigs and cows. Not content to remain in the animal world, Doherty branched off into human studies, and discovered how T-cells were able to target and kill virus-occupied cells. T-cells are one type of white blood cell that helps fight infections. In 1973, Doherty, along with his colleague Rolf Zinkernagel, identified how the infected cell had two markers which the T-Cell needed to recognize before it began its work. One marker was the antigen, in this case the virus, while the other marker was the major histocompatability complex (MHC). The MHC is present on the surface of the infected cell. Doherty's studies focused on the T-cell's surface, which contained a receptor which scanned the damaged cell, looking for the two markers. One important consequence of Doherty's finding was the potential to develop methods using T-cells to search out cancer cells as an “altered self” cell, and destroy the malignancy. Doherty was a recipient of the Albert Lasker Award for Basic Medical Research in 1995. Doherty and Zinkernagel both received the Nobel Prize in Physiology or Medicine in 1996. Doherty excelled in spite of his lack of interest in science in high school .He was kept out of biology class because, only girls could take Biology in Australia at that time! It’s never too late to take up an interest in science!
Nobel Prize entry
Science cite
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Christian Doppler Discovered the Doppler Effect
November 29, 1803 – March 17, 1853 Salzburg, Austria
At the beach, a motorboat speeds by on the water. Notice how the pitch of the engine gets higher as it approaches, then lowers as the vessel speeds off? This phenomenon is called the Doppler Effect, and is named after the Austrian physicist who first discovered it, Christian Doppler. If you’ve ever received a speeding ticket, you might be able to blame Doppler for that too. Police use radar guns, applying Doppler technology, to catch speeders. The Doppler Effect in sound was first tested by Doppler when a railroad car of trumpet players rolled past a train station where another group of trumpet players were trumpeting, all at the same perfect pitch. Amazingly, as the train car moved past, the pitch changed. Doppler also theorized that the Doppler Effect could be ascertained astronomically by a change in the color of light waves as stars approach or recede from each other. Doppler's professional career was hampered by outbreaks of revolution in 1848 in Europe, by conflicts at teaching positions, and by problems with his health, including tuberculosis. Today, there are a myriad of medical applications using the Doppler Effect, including echocardiograms (ultrasound pictures of the heart), obstetrical ultrasonography (ultrasound pictures of unborn babies), and measurement of blood flow which is important for diagnosing heart problems. Doppler radar is also important to help meteorologists (weather people) warn of tornadoes. Medical and weather applications make this a lifesaving discovery.
The British Journal of Radiology entry
Wikipedia entry
Wikipedia reference
Hamburg University resource
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Rosalind Franklin The Important Partner in DNAs Discovery You Never Hear About!
July 25, 1920 – April 16, 1958 Notting Hill, London, England
They say a picture is worth a thousand words. If talking about the discovery of the DNA Double Helix by scientists James Watson and Francis Crick in 1953, a picture is worth a thousand controversies. The dispute indeed deals with a photograph – photograph number. 51 to be exact. This picture was taken by British-scientist Rosalind Franklin in May 1952 using the X-Ray diffraction process. Photograph 51 shows the helix pattern that would form the foundation for the DNA Double Helix model. The problem was that the picture was shown to Watson and Crick by Maurice Wilkins, the assistant director of the lab that Franklin worked for (Wilkins also joined with Watson and Crick as a Nobel recipient for the Double Helix.) Wilkins obtained photograph No. 51 from Franklin's research assistant Raymond Gosling. But, Wilkins never bothered to get the permission of Franklin to show Watson and Crick the photo. That picture was a crucial ingredient in the eventual discovery of the Double Helix, yet Franklin only received a passing mention of her contribution in a footnote in Watson and Crick's publication of their finding. Compounding this lack of attribution is another instance where Franklin's work was borrowed by Watson and Crick with inadequate mention. In 1951, Franklin gave a lecture pointing out the A and B versions of DNA, the location of phosphates on the exterior of the molecule, and the amount of water involved. Watson was in attendance at the Franklin lecture. The key points of her lecture also played a large role in the Double Helix discovery. There was a general environment of sexism at King's College in England where Franklin's research was done, including sex-segregated dining halls (although some male scientists avoided the men-only cafeteria for a mixed sex dining room). Franklin never received the Nobel Prize for her key contribution, presumably because she died young, at age 37, prior to the award, and the Nobel committee stipulates that recipients have to be alive. Nonetheless, there have been many posthumous recognitions of Franklin's work, including the National Portrait Gallery, where her portrait has been placed with those of Watson, Crick, and Maurice Wilkins. Franklin did grow close to Crick and his family after she left King's College and before her death. Moreover, in 1968, Watson did provide much more detail acknowledging Franklin's role in the discovery of DNA in a book, called, not surprisingly, “The Double Helix”. However, Watson’s commentary in the book was not as gracious and was seen as disparaging.
National Institutes of Health cite
UCLA cite
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Carol Greider Discovered Telomeres
April 15, 1961 San Diego, California
How would you like to get a phone call at 5 am in the morning? Probably not, right? Well, what if the call was from the Nobel Committee, telling you that you'd just received the Nobel Prize? And you had to be ready to give a statement within 45 minutes? Well, that's just the situation that happened to scientist Carol Greider in 2009. Greider, along with her colleagues Elizabeth Blackburn and Jack Szostak, was awarded the Nobel Prize for Physiology or Medicine in 2009 for her work on telomeres and telomerase back in the late 1970s and early 1980s. Telomeres are the tips of a chromosome, and shorten each time the cell divides. Picture the cap of a tube of toothpaste or the tip of a shoelace to see the relation of a telomere to the overall cell. After a certain amount of cell divisions, the telomeres act to limit any more splits, and the cell will no longer reproduce, and so becomes dormant. An enzyme, Telomerase, also a finding of Greider, Blackburn, and Szostak, acts to keep the telomeres elongated, so that the cell can divide indefinitely. Limiting telomerase helps to put a brake on cancer cells, which otherwise keep on endlessly dividing. Greider created the first “knockout mouse” for telomerase: No, it's not a pet of rap/alt/electronic musician Danger Mouse; rather, a “knockout mouse” is a genetically engineered rodent with some of its genes switched off. A knockout mouse can be studied to see what the effects are when certain genes are not working. The genetic makeup of such mice can be compared to humans. Greider's telomerase research was one of the biggest Christmas presents ever given by scientists to the world - Greider made her discovery on Christmas Day, 1984.
Johns Hopkins University Gazette reference
Wikipedia entry
Wikipedia cite
Lancet resource
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Luis Leloir Discovered the Cause of Galactosemia - Rare Condition of Newborns
September 6, 1906 -1987 Paris, France
Most every student has experienced the anxiety of not getting a good grade on a test. It might surprise you to learn that one prominent scientist failed the anatomy exam for medical school - four times! Luis Leloir, a French born Argentine researcher, was that scientist. Later though, he became a doctor, and went on to discover the cause of galactosemia, a rare genetic disorder marked by the inability to metabolize galactose, a common sugar. In the body, lactose (commonly found in lots of food such as milk) taken in by diet is normally broken down by an enzyme into glucose and galactose. In infants with this disorder, they either entirely lack or have severely limited amounts of the enzymes that would metabolize the galactose. As a result, toxic levels will build up in the blood, eventually causing liver failure, kidney failure, and brain damage. Leloir discovered that the cause was a missing enzyme and discovered how the body normally metabolizes galactose. Leloir was a very resourceful researcher. His labs had very little funding, so he had to make due with very rudimentary equipment. For example, one time he created a centrifuge out of a spinning tire! Another time, he used a childhood toy Meccano set, which is very much like an erector set, to build a tool for column chromatography! To protect his building's supply of books, he fashioned gutters made out of cardboard that he waterproofed! Leloir also had to take refuge from Argentina in 1943 when he incurred the wrath of Juan Peron, the caudillo (a political-military leader) of the Argentine government. He also was interested in the culinary arts and he invented a new dressing to be applied to shrimp, called salsa golf, which mixed ketchup and mayonnaise. Leloir was a member of the National Academy of Arts and Sciences and the American Academy of Arts and Sciences. Leloir was a recipient of the 1970 Nobel Prize in chemistry, the first ever Spanish language scientist to receive that award.
Chemistry Explained website
Nobel Prize entry
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Rita Levi-Montalcini World's Oldest Scientist
April 22, 1909 Turin, Italy
How old is it when you're “over the hill”? 30, 50, or 75? Today, a Nobel winning scientist goes to work every day at the ripe young age of 101! Rita Levi-Montalcini, the scientist who, in 1952, discovered Nerve Growth Factor (NGF), is just such an active senior. She credits her stamina to diet, the fact she's not married, and to her schedule (she rises at 5 am, and goes to bed at 11pm! She even uses eye drops from her famous discovery, NGF, which may help as well. Nerve Growth Factor is a small protein that is important for the growth, maintenance, and survival of certain nerve cells. It is hoped that it can be used to help treat diseases of the nervous system, such as multiple sclerosis. There is evidence that it may be related to diabetes, as well as some psychiatric disorders. Levi-Montalcini's main focus today is on brain science. She survived WWII in Italy, surviving Mussolini's hostility toward Jews, then dodged Allied bombing raids at her home in Turin, by moving to the countryside, before resuming a more normal scientific career. In 1986, Levi-Montalcini was the recipient of the Nobel Prize for Physiology or Medicine. She's a prominent member of Italy's political establishment as well, having been appointed a Senator for Life in 2001.
Times Online link
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Independent entry
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Ernest McCulloch The First to Identify the Stem Cell
April 21, 1926 Toronto, Canada
Are you a “Transformers” fan? Those TV cartoon robots can develop into all kinds of different objects, machines, and animals. Well, there are biological “transformer” cells in real life, called stem cells, which were discovered by Canadian scientist Ernest McCulloch. McCulloch, along with colleague James Till, published their work about the stem cell in 1963. McCulloch and Till radiated mice in order to wipe out their immune system and then injected bone marrow cells into them. In their research, they found nodules in the spleens of rodents where the transplanted cells had begun to differentiate, that is, to transform themselves into different types of cells. McCulloch and Till also noticed that these cells had the capability to self-renew. This was the sought after “stem cell”. Their breakthrough was the first step for many applications of possible medical treatments. It is currently used experimentally to treat several types of cancer and there are hopes to treat many other diseases such as Diabetes, Parkinson’s disease, Huntington’s disease, and many others. McCulloch was made a member of the Canadian Medical Hall of Fame in 2004. McCulloch and Till both were recipients of the 2005 Albert Lasker Award for Basic Medical Research.
Canadian Institutes of Health Research entry
Lasker Foundation reference
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Cesar Milstein Developed a Technique for Producing Monoclonal Antibodies
October 8, 1927 – March 24, 2002 Bahia Blanca, Argentina
Cancer scientists continue to work towards “smart bombs” against cancer cells. The idea is to steer antibodies with laser precision against tumor cells, destroying the malignancies but leaving healthy cells alone. One researcher who helped advance this cause was Cesar Milstein. Milstein was born in Argentina, and worked in the field of biochemistry. In 1975, Milstein collaborated with Georges Kohler and they were able to develop a procedure fusing an antibody producing cell with a cancer cell and grow it in incubators. These were mouse cells and they produced antibodies that were very specific, that is they only reacted with a single kind of cell. Such unadulterated antibodies are called monoclonal antibodies. Their results led to the ability to identify specific proteins at the cellular level, which has greatly assisted research and treatments for various illnesses, including some cancers. Milstein had an interesting personal life. When he married his wife Celia, their honeymoon consisted of hitchhiking across Europe for almost a year, then spending some time in a Kibbutz in Israel! Milstein was the recipient of a large number of distinguished awards, including the Karl Landsteiner Award, American Association of Blood Banks in 1982, the Albert Lasker Basic Medical Research Award and the Nobel Prize in Physiology or Medicine in 1984.
New York Times link
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