He attended the University of California in and in received a Bachelor of Science degree. Remarkably, without graduate training, he then worked as an instructor of biochemistry for three years at Meharry Medical College in Nashville, Tennessee.
In he enrolled at the University of Washington where he pursued advanced degrees. Instead he worked for various companies as a biochemist and during that period received the first of the 14 U. S patents. By Chappelle was employed at the National Aeronautics and Space Administration NASA where he was an exobiologist someone who engaged in the search for extraterrestrial life and the effects of extraterrestrial surroundings on living organisms and astrochemist the chemistry of astronomical objects and interstellar space.
In Chappelle went on to work for the Goddard Space Flight Center where he was a scientific analyst responsible for monitoring remote sensing devices. Along with his 14 U. He has co-authored and edited numerous other publications on a variety of subjects. Throughout his career, he has mentored talented minority high school and college students in his laboratories. In , Chappelle was inducted into the National Inventors Hall of Fame for his work on bioluminescence.
He is often included on lists of the most important scientists of the 20th century. Actively scan device characteristics for identification. Use precise geolocation data. Select personalised content. Create a personalised content profile. Measure ad performance. Select basic ads.
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She is known for her independent films and documentaries, including one about Alexander Graham Bell. If the cell is alive, ATP will be present and would glow in this assay. Chappelle tested for living cells in terrestrial soils by adding luciferin and luciferase to samples and measuring how much light was produced.
If there was life, the cells glowed. Chappelle invented a test for microbial life using firefly enzymes that make living cells glow. Chappelle did not discover life on Mars since no Martian soil has ever been brought back to Earth to test, but his assay is still used here on Earth to detect and study microbial life.
In , Chappelle was hired by NASA to work at the Goddard Space Flight Center, where he continued his research into the applications of fluorescence and bioluminescence.
The uses he found for his fluorescent tests were incredibly varied; he developed way to measure crop stress in agricultural fields using lasers, and medicinal tests to detect bacterial infections in blood and urine. Chappelle passed away 4 months ago in October at the age of
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