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from article Heat convection

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Streamlines in flow past a cylinder normal to flow at increasing values of the flow velocity (expressed in terms of the Reynolds number, NRe ). (a) NRe ≈ 10. (b) NRe ≈ 104. (c) NRe ≤ 1 × 105. (d) NRe ≥ 1.5 × 105.

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from article Energy

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During combustion, the potential energy stored in wood as chemical energy is being converted into kinetic energy in the forms of thermal energy (heat) and light. (Credit: Shutterstock / Sinelev)

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from article Mycorrhizae

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Example of a mycorrhizal association. The composite image shows the symbiotic relationship between a fly agaric mushroom (Amanita muscaria) and a birch tree (genus Betula). The mushroom receives sugar (C6H12O6) and oxygen (O2) from the tree and…

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from article Mycorrhizae

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There are different types of symbiotic mycorrhizae. Ectomycorrhizae involve fungal hyphae that surround the cell walls of plant roots, but do not penetrate them. Endomycorrhizae involve fungal hyphae that penetrate the outer cells of plant roots.…

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from article Mycorrhizae

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Cross section of several types of mycorrhizal fungi. (Credit: Modified from an original drawing by V. Furlan)

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from article Mycorrhizae

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Ectomycorrhizae are characterized by a macroscopically visible fungal sheath that surrounds the plant root. (Credit: Robert L. Anderson/U.S. Department of Agriculture Forest Service)

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from article Pipeline

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Pipelines. (a) Construction of 300-mi, 24-in. (500-km, 60-cm) pipeline in Colombia that runs over the Andes to the Caribbean coast. (b) Construction of 30-in. (75-cm) gas pipeline in Pennsylvania in 1982. (c) Trans-Arabian oil pipeline, built in…

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from article Pipeline

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Velocity of pipe flow as function of internal pipe diameter for various applications. 25 lbf/in.2, gage pressure = 172 kPa above atmospheric pressure.

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from article Pipeline

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Friction factor as function of Reynolds number for clean commercial steel pipes with various inside diameters. For example, pipe with inside diameter of 12 in. (305 mm) and flow having Reynolds number of 300,000 has friction factor of 0.016. Upper…

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from article Cuculiformes

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Greater roadrunner (Geococcyx californianus). (Photo courtesy of Marguerite Gregory, copyright © California Academy of Sciences)

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from article Atomization

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Single-fluid atomizers. Diagrams on right are cross sections. (a) Pressure atomizer. (b) Pressure-swirl atomizer. (c) Impinging-jet atomizer. (d) Rotary atomizer.

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from article Atomization

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Twin-fluid atomizers. Diagrams on right are cross sections. (a) External-mix atomizer. (b) Y-jet internal-mix atomizer. (c) Effervescent internal-mix atomizer.

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from article Atomization

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Secondary atomization mechanisms. (a) Bag mode. (b) Boundary-layer stripping mode. (c) Catastrophic mode.

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from article Atomization

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Entrainment of surrounding air by a spray.

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from article Atomization

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Atomizer sprays. (a) Hollow-cone spray. (b) Solid-cone spray.

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from article Gavial

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Indian gavial (Gavialis gangeticus). (Credit: Kevin A. Boudreaux)

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from article Colony collapse disorder

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A beekeeper examining a managed honeybee population affected by colony collapse disorder. Note the large number of frames of brood that have been completely abandoned by the adult bee population, indicating that, shortly before dying, this colony…

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from article Colony collapse disorder

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Close-up view of managed honeybees covering a honeycomb. (Credit: Aaron Roeth)

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from article Euthanasia

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Euthanasia is an act by a person, typically a physician, actively and intentionally to end another person's life by some medical means at that person's explicit request. (Credit: Michael Jung/Shutterstock)

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from article Septibranchia (Anomalodesmata)

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Septibranch morphology. (a) Cuspidaria [after J. A. Allen and R. E. Morgan, The functional morphology of Atlantic deep water species of the families Cuspidariidae and Poromyidae (Bivalvia): An analysis of the evolution of the septibranch condition,…

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from article Mistletoe

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European mistletoe (Viscum album). (Photo by Jan Samanek, State Phytosanitary Administration, Czech Republic)

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from article Chipmunk

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Eastern chipmunk (Tamias striatus) at Trustom Pond National Wildlife Refuge, Rhode Island. (Photo courtesy of Tom Tetzner, U.S. Fish and Wildlife Service)

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from article Scaphopoda

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Scaphopod marine tusk shells (order Dentaliida): (top) elephant tusk shell (Dentalium elephantinum); (bottom) formosan tusk shell (Pictodentalium formosum). (Photo courtesy of Carl C. Hansen, Smithsonian Institution, Washington, DC)

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from article Hymenoptera

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Paper wasp (genus Polistes). (Credit: Russ Ottens/University of Georgia)

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from article Hymenoptera

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Honeybee (Apis mellifera). (Credit: Joseph Berger/Bugwood)

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