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#OTD in 1968, Apollo 6 was launched. It was an uncrewed test of the Saturn V launch vehicle and the final uncrewed Apollo test mission. 📷 NASA
#OTD in 1647, Maria Sibylla Merian was born in Frankfurt. She was one of the first naturalists to observe the life cycle of insects. Merian is also known for her beautiful scientific illustrations.
#OTD in 1965, Gemini 3 with Gus Grissom and John Young was launched, the first manned mission in NASA's Gemini program. They flew three low Earth orbits. 📷 NASA
79. Ehrlichia chaffeensis is transmitted by certain ticks & causes monocytotropic ehrlichiosis. The bacteria are not killed in monocytes.
77. The protozoan Leishmania is able to survive within the fused phagolysosome. They multiply within the macrophage until the cell dies. 📷 Public Domain, CDC/ Dr. Francis W. Chandler
#OTD in 2008, the Swift satellite detected the gamma-ray burst GRB 080319B. It's the farthest object (7.5 billion light-years) that was observable with the naked eye. 📷 NASA/Swift/Stefan Immler, et al.
75. Mycobacterium tuberculosis, the causative agent of tuberculosis, prevents the fusion of the phagosome and lysosome in macrophages. 📷 Public Domain, CDC/ Ray Butler, MS
57. A full-blown monocyte/macrophage inflammasome activation needs two signals: PAMP + DAMP.