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During the twentieth century in the United States, Alfred Day Hershey studied phages, or viruses that infect bacteria, and experimentally verified…
Hershey, A. D. (Alfred Day), 1908-Bacteriophage lambdaPhage lambdaBacteriophages--GeneticsBacteriophagesDavid Hunter Hubel studied the development of the visual system and how the brain processes visual information in the US during the twentieth century…
Hubel, David H.Kuffler, Stephen W.Wiesel, Torsten N.Johns Hopkins Medical SchoolHarvard Medical SchoolDuring 1964, David Hubel and Torsten Wiesel studied the short and long term effects of depriving kittens of vision in one eye. In their experiments,…
Harvard Medical SchoolNobel Prize winnersKittensCatsVision disordersTorsten Nils Wiesel studied visual information processing and development in the US during the twentieth century. He performed multiple experiments…
VisionVisual pathwaysNobel Prize winnersNeural networks (Neurobiology)Neural ReceptorsHarald zur Hausen studied viruses and discovered that certain strains of the human papilloma virus (HPV), a sexually transmitted disease, can cause…
Cervix uteri--CancerHuman Papilloma VirusPapillomavirusesGenital WartsCondylomata AcuminataEdgar Allen identified and outlined the role of female sex hormones and discovered estrogen in the early 1900s in the US. In 1923, Allen, through his…
EstrogenHormones, SexOogenesisEstrusMenstrual CycleNuclear magnetic resonance imaging (MRI) is a technique to create a three-dimensional image of a fetus. Doctors often use MRIs to image a fetuses…
TechnologyMagnetic resonance imagingNuclear Magnetic ResonanceFetusDiagnostic ultrasonic imagingIn the nineteenth century, reticular theory aimed to describe the properties of neurons, the specialized cells which make up the nervous system, but…
Nerve TissueNervous SystemNobel Prize winnersBrainNeuronsApoptosis, or programmed cell death, is a mechanism in embryonic development that occurs naturally in organisms. Apoptosis is a different process…
ApoptosisGenetic regulationCaenorhabditis elegansCellsGerm CellsIn 1873 Italy, Camillo Golgi created the black reaction technique, which enabled scientists to stain and view the structure of neurons, the…
TechnologyNeuronsAxonsDendritesSilver Nitrate