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from article Allosteric enzyme

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Model of an allosteric enzyme composed of two subunit monomers. Regulatory effects are obtained by shifting back and forth between the two states—relaxed (R state) and taut (T state). In the R state, the enzyme reacts with substrate and activators;…

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from article Hydroformylation

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Slurry process, in which the catalyst is carried with the liquid reactant.

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from article Heart (invertebrate)

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Invertebrate hearts range from (left) the centralized hearts and open circulatory systems of grasshoppers to (right) the distributed hearts and closed circulatory systems of segmented worms. (Copyright © McGraw-Hill Education)

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from article Heart (invertebrate)

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Circulatory system in a marine snail (Aplysia). Arrows indicate the normal direction of blood flow. (Credit: E. Mayeri, J. Koester, I. Kupfermann, G. Liebeswar, and E. R. Kandel)

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from article Heart (invertebrate)

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Cardiac ganglion of a lobster (Homarus): (a) nerves on the inner dorsal surface of the heart; (b) cell body position of all nine intrinsic neurons. (Credit: D. K. Hartline)

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from article Heart (invertebrate)

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Cross section of a leech (Hirudo), showing its major organs and muscles, including its ventral nerve cord and the four longitudinal coelomic sinuses, which are the main vessels of its circulatory system. The nerve cord is enclosed in the ventral…

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from article Agricultural aircraft

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An agricultural aircraft applying pesticide over a field. (Credit: BrianBrownImages/Getty Images)

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from article Agricultural aircraft

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Application equipment for fixed-wing agricultural aircraft. The spraying equipment is shown on the aircraft, and a ram-air-type spreader for dry materials is shown below the aircraft.

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from article Agricultural aircraft

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Application equipment for rotary-wing agricultural aircraft. (a) Helicopter with spray equipment attached. (b) Dry equipment. (c) Detail of hopper and spinner.

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