Emmett Chappelle facts for kids
Quick facts for kids
Emmett W. Chappelle
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Chappelle at the National Inventors Hall of Fame induction ceremony in 2007
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| Born | October 24, 1925 |
| Died | October 14, 2019 (aged 93) |
| Education | Phoenix College, University of California, Berkeley (B.S.), University of Washington (M.S.) |
| Known for | Bioluminescence |
| Scientific career | |
| Fields | Biochemistry, food science, astrochemistry |
| Institutions | Meharry Medical College (Nashville, Tennessee), Stanford University, Martin Marietta Corporation, National Aeronautics and Space Administration (NASA) |
Emmett W. Chappelle (born October 24, 1925 – died October 14, 2019) was an amazing American scientist. He made many important contributions in areas like medicine, food science, and even the study of space chemistry. His incredible work on how living things create light, called bioluminescence, led to him being honored in the National Inventors Hall of Fame in 2007. He was also recognized as one of the top 100 most distinguished African American scientists of the 20th Century.
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Early Life and Education
Emmett Chappelle was born in Phoenix, Arizona, in 1925. His parents, Viola White Chappelle and Isom Chappelle, were farmers who grew cotton and raised cattle. Growing up, Emmett faced a time when schools were separated by race. He attended the segregated Phoenix Union Colored High School, where he was the best student in his graduating class of 25.
After finishing high school in 1942, Emmett joined the army. He took some engineering courses before being sent to Italy with the 92nd Infantry Division. During his time serving his country, he was injured twice, but thankfully not fatally. After returning from Italy in 1946, he went to Phoenix College. There, he studied electrical engineering and earned an A.A. degree. Soon after, he decided to change his focus and pursue a career in the sciences.
A Journey into Science
In 1950, Chappelle earned a Bachelor of Science degree in biology from the University of California, Berkeley. He then became a biochemistry instructor at Meharry Medical College in Nashville, Tennessee, from 1950 to 1953. Even without advanced degrees at that time, he was teaching! He later continued his education at the University of Washington, where he earned his master's degree in biology. From 1955 to 1958, he worked as a research associate at Stanford University. He also served as a scientist and biochemist for the Research Institute of Advanced Studies until 1963.
In 1958, Emmett Chappelle joined the Research Institute in Baltimore, which was part of a company called Martin Marietta that designed airplanes and spacecraft. Here, he made a super important discovery! He found out that even tiny, single-celled organisms, like algae (those green things you sometimes see in water), can perform photosynthesis. Photosynthesis is the process where plants and some other organisms use sunlight to turn carbon dioxide (the air we breathe out) and water into sugar (their food) and oxygen (the air we breathe in). This discovery helped us understand how these tiny organisms contribute to life on Earth.
Working with NASA
In 1963, Chappelle worked as a biochemist at Hazelton Laboratories. But then, in 1966, he joined the National Aeronautics and Space Administration, or NASA! He became an exobiologist and astrochemist. An exobiologist is like a detective who looks for signs of life beyond Earth, and an astrochemist studies the chemicals found in stars, planets, and space. At NASA, he helped design instruments for the Viking Spacecraft, which traveled all the way to Mars to collect and study soil samples.
The Magic of Bioluminescence
While working on the Mars mission, Emmett Chappelle became fascinated by bioluminescence. This is the amazing way some living things, like fireflies, glow in the dark! He developed a clever method using two special chemicals, luciferase and luciferin, which come from fireflies. When these chemicals are mixed with ATP (adenosine triphosphate), which is like the energy currency found in all living cells, they give off light!
This discovery was huge! It meant scientists could use this light to detect the presence of ATP, and therefore, detect if there was life, even tiny amounts, on other planets! It also helped doctors and scientists in many ways here on Earth. For example, Chappelle proved that by measuring the amount of light given off, you could tell how many bacteria were in a sample of water. This was super helpful for doctors to quickly find out if someone had a bacterial infection, like in their urine, so they could get the right medicine faster.
Checking on Plants from Space
In 1977, Emmett Chappelle moved to the Goddard Space Flight Center in Maryland, where he became a remote sensing scientist. This means he studied natural systems from a distance, often using special tools and even satellites, to help manage our environment better. He developed a method to check on the health of plants by using laser-induced fluorescence. This technique measures how much photosynthesis is happening in crops. By doing this, scientists could tell if plants were stressed, how fast they were growing, if they had enough water, and even the best time to harvest them. This was a huge help for farmers and for understanding our planet's ecosystems!
Amazing Inventions and Patents
Emmett Chappelle was not just a discoverer; he was also an inventor! He held several patents for his brilliant ideas. A patent is like a special certificate that says you invented something new and no one else can make or sell it without your permission.
- Method of Detecting and Counting Bacteria (Patented July 27, 1976): This invention provided a better way to find and count tiny bacteria, especially in liquids from our bodies. It worked by finding the bacteria's energy (ATP) and making it glow with the firefly chemicals. This was super helpful for finding even small amounts of bacteria.
- Application of Luciferase Assay for ATP to Antimicrobial Drug Susceptibility (Patented March 29, 1977): This patent described a way to quickly see how well medicines (called antimicrobial agents) work against bacteria. By measuring the bacteria's energy before and after giving them medicine, doctors could tell if the medicine was doing its job.
- Determination of Antimicrobial Susceptibilities on Infected Urines Without Isolation (Patented January 2, 1979): This invention made it even faster to figure out if someone had a bacterial infection, like in their urine, and which medicine would be best to treat it. It meant doctors didn't have to wait a long time to grow the bacteria in a lab first.
- Rapid, Quantitative Determination of Bacteria in Water (Patented May 24, 1983): This was a super-fast way to find bacteria in water using light. It helped make sure our drinking water and other water sources were clean and safe for everyone.
- Method for Determining Surface Coverage by Materials Exhibiting Different Fluorescent Properties (Patented May 2, 1995): This clever method used special light (ultraviolet radiation) to tell the difference between living plants, dead plant bits (like leftover crops on a field), and bare soil from far away. This helped farmers and scientists understand what was growing on the land and how healthy it was.
Later Life and Legacy
Emmett Chappelle retired from NASA in 2001, at the age of 76. He passed away in Baltimore, Maryland, on October 14, 2019, at the age of 93. His groundbreaking work in bioluminescence and his contributions to space science continue to inspire new generations of scientists.
