Preserving food, less fighting for food, less roaming to hunt and gather. More stable sense of community. More children. Preserving food, less fighting for food, less roaming to hunt and gather. More stable sense of community. More children.
Contrast sensitivity is the ability of an imaging process to produce an image of objects or tissues in the body that have relatively small physical differences or inherent contrast. The contrast that is to be imaged is in the form of some specific physical characteristic.
THE DARK-FIELD MICROSCOPE â¢ produces a bright image of the object against a dark background â¢ used to observe living, unstained preparations 15 16 Figure 2.7b THE PHASE-CONTRAST MICROSCOPE â¢ enhances the contrast between intracellular structures having slight differences in refractive index â¢ excellent way to observe living cells 17 18 Figure 2.9 19 Figure 2.10 THE DIFFERENTIAL INTERFERENCE CONTRAST