By Aldo Leopold
"We can position this ebook at the shelf that holds the writings of Thoreau and John Muir." San Francisco Chronicle
These fabulous snap shots of the wildlife discover the breathtaking range of the unspoiled American panorama -- the mountains and the prairies, the deserts and the coastlines. a gorgeous tribute to our land and a daring problem to guard the realm we adore.
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Extra resources for A Sand County Almanac (Outdoor Essays & Reflections)
No irreversible or serious health consequences linked to these effects have been demonstrated. They are sometimes disagreeable, but they do not affect everyone. On the other hand, considerable prudence is necessary for persons fitted with metal-containing implants and for any other indirect effects due to the violent attraction of metal objects by the superconducting magnet. imrser. org/ International Commission on Non-Ionizing Radiation Protection (ICNIRP) (2004) Medical Magnetic Resonance (MR) procedures: protection of patients.
Thus, with calibrated electric pulses, the induced transmembrane potential difference (see ‘‘Sect. 2’’) can mimic the action potential and bring about the controlled contraction of muscles. This is the principle of functional electrical stimulation (see ‘‘Medical applications’’). Reversible Electropermeabilisation The preceding effect is obtained with electric pulses of low amplitude. cm-1), the transmembrane potential difference attains values such that the membrane of the cell can no longer maintain its isolating molecular structure.
A magnetic field at a frequency of 50/60 Hz is imperceptible below 5 mT, a value that is never reached in normal human exposure. Magnetophosphenes*, transitory visual luminous perceptions (which only last during exposure) and without pathological consequences, have been described for exposures from 5 to 10 mT at 20 Hz. At 50/60 Hz, this threshold could be of the order of 15 mT. In both animals and humans, magnetite crystals have been observed by electron microscopy, and by using SQUID magnetometers.
A Sand County Almanac (Outdoor Essays & Reflections) by Aldo Leopold