منابع مشابه
Genetic Adaptation: A New Piece for a Very Old Puzzle
Does stress create mutations or only serve as an agent of natural selection? New experiments reveal effects of transcription and temperature on the response to growth limitation and could help resolve a 150-year-old debate.
متن کاملReminiscences of an Old-Time Doctor
Early in June 1889 the writer entered Cooper Medical College, San Francisco, now the Medical Department of Stanford University. Prior to his admission he had, under the tutelage of a friend, Dr. Charles Pemberton Murray, a graduate of Columbia's College of Physicians and Surgeons, been quizzed twice a week for about a year on assigned readings from Gray's Anatomy and Dalton's Physiology, at tha...
متن کاملModeling Madness in Mice: One Piece at a Time
Mouse models that recapitulate the full phenotypic spectrum of a psychiatric disorder, such as schizophrenia, are impossible. However, a more piecemeal recreation of phenotypic components is feasible and promises to harness the power of animal models using approaches that are either off limits or confounded by drug treatment in humans. In that context, animal models will have a central and indi...
متن کاملPruning an Axon Piece by Piece A New Mode of Synapse Elimination
The process by which excess axons are pruned during development has remained unclear. In this issue of Neuron, Bishop et al. use time-lapse imaging and serial electron microscopy of developing neuromuscular junctions to describe a novel cellular mechanism in which retracting axon branches shed fragments rich in normal synaptic organelles. These "axosomes" are engulfed by adjacent Schwann cells ...
متن کاملAn old emperor finds new clothing: rejuvenation in our time.
T o cast this sage historical advice into contemporary terms, the eternal human predisposition to believe in flimsy promises of rejuvenation needs to be well understood, or repeated. As an ingenious species, we have made grand advances in overcoming the physical limits of our biology. Yet while technology has overcome our native ponderous, gravityand land-bound locomotion with air, land and sea...
متن کاملذخیره در منابع من
با ذخیره ی این منبع در منابع من، دسترسی به آن را برای استفاده های بعدی آسان تر کنید
ژورنال
عنوان ژورنال: Scientific American
سال: 1880
ISSN: 0036-8733
DOI: 10.1038/scientificamerican12041880-4098asupp