Waltz of erythrocytes. Free Technical Library News

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RBC Waltz

09.01.2006

Indian scientist Deepak Masur from the Institute for Basic Research in Bombay discovered that human red blood cells, if a circularly polarized laser beam is directed at them, begin to rotate around their own axis.

The rotation speed reaches one hundred revolutions per minute. The erythrocyte is not damaged. It is assumed that the accidentally discovered phenomenon is explained by the interaction of ions unevenly distributed inside the cell with the electromagnetic field of the laser beam. Curiously, unlike healthy red blood cells, erythrocytes infected with a malaria parasite rotate even under the influence of a laser beam with conventional linear polarization.

This phenomenon can be used for early diagnosis of malaria. Scientists hope, moreover, that erythrocytes rotating under the influence of a laser beam can be used as motors in nanotechnological devices in the near future.

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sound bait 18.10.2011

Plants often lure bees and other pollinators with the scent and color of their flowers. But many tropical plants are not pollinated by insects, but by bats. These bats fly at night and scan their surroundings with pulses of ultrasound.

As an expedition of botanists from England and Germany discovered, the Cuban liana Marcgravia evenia attracts sound to its inflorescences. The leaf located above the inflorescence has a concave shape close to a parabolic reflector. In a dark tropical forest, a bat "sees" the characteristic reflection of ultrasound from this leaf and flies straight to the inflorescence, where it feasts on sweet nectar and stains its muzzle in pollen. Having found the next vine, the mouse transfers pollen to its inflorescence.

Experiments have shown that if the sound-reflecting sheet is cut off, the search for nectar is halved.

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