About Johns Hopkins

Recent news from The Johns Hopkins University

This section contains regularly updated highlights of the news from around The Johns Hopkins University. Links to the complete news reports from the nine schools, the Applied Physics Laboratory and other centers and institutes are to the left, as are links to help news media contact the Johns Hopkins communications offices.

 

Chilean Miners/Biological Clocks: Johns Hopkins Expert

Reporters working on stories about the impact of the Chilean miners’ long ordeal underground should consider speaking with Samer Hattar, an assistant professor of biology at The Johns Hopkins University. An expert on how exposure to light – or lack thereof – affects mammals’ biological clocks and health, Hattar can discuss the likely impact that 69 days without natural light had on the miners’ physiology, especially their sleep-wake cycles.

Blind Mice Can “See” Thanks To Special Retinal Cells

It would make the perfect question for the popular television show “Are You Smarter than a 5th Grader:” What parts of the eye allow us to see? The conventional wisdom: rods and cones. The human retina contains about 120 million rods, which detect light and darkness, shape and movement, and about 7 million cones, which in addition detect color. Without them, or so we are taught, our eyesight simply would not exist. But that might not be true, according to a study — published July 15 in the journal Neuron and led by Johns Hopkins biologist Samer Hattar — that provides new hope to people who have severe vision impairments or who are blind.