Stem cells toward sperm cells and back again
... naturally in the flies, and whether spermatogonia retrace the path taken by stem cells -- a true reversal -- or whether they use different signals, proteins and processes to revert to stem cells....NCAR aircraft, ground instruments to track carbon dioxide uptake
...full of specialized instruments. The aircraft will retrace the pattern again between 2:00 and 4:00 p.m. the same day, flying as low as 1,000 feet above the ground in some places and rising to 16,500 feet in others. The pilots expect to fly four or five days in May and the same number in July. They will also ...Media advisory: Sea of Cortez expedition to launch March 26
...ogist William Gilly, the two-month expedition will retrace a 1940 voyage by author John Steinbeck and scientist Edward Ricketts to Mexico's Gulf of California. That epic, 4,000-mile journey was immortalized in the book, Sea of Cortez, co-authored by Steinbeck and Ricketts. Professor Gilly will be accompanied...Expedition will retrace legendary Steinbeck-Ricketts voyage to the Sea of Cortez
..., a team of scientists and scholars is planning to retrace that legendary voyage. The Sea of Cortez Expedition and Education Project, led by researchers from Stanford University's Hopkins Marine Station, will embark from Monterey on March 11, 2004, in the Gus D, a 73-foot wooden commercial fishing boat that ......y II, a multi-agency traveling classroom that will retrace the route of the Lewis and Clark expedition. At many stops along the route, USGS scientists will talk about ongoing USGS investigations, explaining changes in river systems and pointing out advances in scientific instruments and understanding that ha......Aug. 20, a Smith College-sponsored expedition will retrace the original route of the Harriman Expedition, in ...cognized scientists, artists and naturalists, will retrace the 9,000-mile route of Harrimans steamship, following the Inside Passage along the Alaska Peninsula...