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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 Fig

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Panachée fig (Ficus carica). (Photo courtesy of David Karp, Agricultural Research Service, United States Department of Agriculture)

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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 Quinoa

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Quinoa (Chenopodium quinoa). (Photo courtesy of Lisa Cyr)

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from article Quinoa

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Structure of the major sapogenols of quinoa: oleanolic acid, hederagenin, and phytolaccagenic acid.

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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 Alder

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Red alder (Alnus rubra), Mount Adams, Washington. (Photograph by Susan McDougall, USDA–NRCS PLANTS Database)

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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 Cubeb

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Cubebs (Piper cubeba). (Photo courtesy of M. I. Ansari)

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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 Ballistic missile

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A Minuteman ballistic missile housed at the Delta-09 silo in South Dakota, which is now a museum. The silo is 12 feet in diameter and 80 feet deep. The missile, equipped with a 1.2-megaton nuclear warhead, was kept in fully operational status from…

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from article Ballistic missile

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Typical intercontinental ballistic missile (ICBM) trajectory superimposed on Earth's circumference.

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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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from article Hymenoptera

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Adult morphology of the honeybee (Apis mellifera): (a) adult female worker; (b) posterior view of mouthparts (labiomaxillary complex); (c) apex of leg depicting components of the pretarsus; (d) sting complex. (Credit: Sara L. Taliaferro)

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from article Hymenoptera

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Larval hymenopterans: (a) diagrammatic tenthredinid sawfly larva; (b) diagrammatic mature nomadine bee larva. (Credit: Sara L. Taliaferro)

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from article Hymenoptera

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Pavement ant (Tetramorium caespitum). (Credit: Joseph Berger/Bugwood)

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from article Oregano

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European oregano (Origanum vulgare). (Photo courtesy of Leo Michels)

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from article Grape

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Clusters of (left) common black grapes and (right) common red grapes (Vitis vinifera; subgenera Euvitis). (Photo by Patrick Tregenza, Agricultural Research Service, U.S. Department of Agriculture)

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from article Grape

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Muscadine grapes (Vitis rotundifolia; subgenera Muscadinia). (Photo by David Nance, Agricultural Research Service, U.S. Department of Agriculture)

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from article Grape

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The three main training–pruning systems used in California. (a) Head-trained–spur-pruned. (b) Cordon-trained–spur-pruned. (c) Head-trained–cane-pruned. (After R. J. Weaver, Grape Growing, John Wiley and Sons, New York, 1976)

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from article Grape

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Slapper-type mechanical harvester. (After R. J. Weaver, Grape Growing, John Wiley and Sons, New York, 1976)

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from article Grape

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Grape anthracnose (caused by Elsinoë ampelina), which is commonly called bird's-eye rot. (Photo courtesy of Clemson University, U.S. Department of Agriculture Cooperative Extension Slide Series; Bugwood.org)

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from article Grape

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Downy mildew (caused by Plasmopara viticola) on a grape leaf. (Photo courtesy of the University of Georgia Plant Pathology Archive; Bugwood.org)

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from article Broccoli

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Flower buds of broccoli (Brassica oleracea var. italica). (Photo courtesy of Forest and Kim Starr)

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from article Clove

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Dried cloves, the unopened flower buds of Syzygium aromaticum. (Photo courtesy of Jorge Barrios)

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from article Beekeeping

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A typical honeybee (Apis mellifera). (Credit: Stephen Ausmus/Agricultural Research Service, U.S. Department of Agriculture)

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from article Beekeeping

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A pine tree cavity, which is a natural home for honeybees. (Credit: Georgia Forestry Commission, Dry Branch, Georgia)

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from article Beekeeping

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Part of a colony of honeybees. Note the larger queen in the center of the photo. (Credit: Scott Bauer/U.S. Department of Agriculture Forest Service)

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from article Beekeeping

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A typical wooden beehive. (Credit: Stephen Kirkpatrick/Natural Resources Conservation Service, U.S. Department of Agriculture)

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from article Beekeeping

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A modern-day commercial apiary. Beekeepers often select apiary sites surrounded by woods so as to protect bees from damage by wind. In addition, secluded apiaries are less likely to be vandalized. (Credit: Carl Dennis/Auburn University, Alabama)

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from article Badger

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American badger (Taxidea taxus). (Photo by Gerald and Buff Corsi; © California Academy of Sciences)

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from article Platycopida

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Cytherella abyssorum, an ostracod of the order Platycopida. (a) Female with left valve removed; eggs lie in posterior brood chamber outside body. (b) Posterior end of male body with paired furcae and long hemipenes. (c, d) Male first and second…

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from article Eutriconodonta (Triconodonta)

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Eutriconodontan molars had three main cusps. (a) External view of a lower molar of Amphilestes, an amphilestid eutriconodontan. (b) Internal view and (c) occlusal view of a lower molar of Priacodon, a triconodontid eutriconodontan.

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from article Eutriconodonta (Triconodonta)

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Partial restoration of the skeleton of Gobiconodon, a gobiconodontid eutriconodontan. The length of the tail of Gobiconodon is unknown. In other gobiconodontids, the tail contributed approximately 50% of the total length of the body. (After F. A.…

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from article Chinchilla

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The chinchilla, with more hair per square inch than any other animal, is valued for its fur. (Photo courtesy of Kurt Benirschke/Comparative Placentation, University of California, San Diego)

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from article Odonata

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An aeshnid dragonfly (note the distinctive wing venation) and a lestid damselfly.

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from article Odonata

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Larvae of (a) a dragonfly and (b) a damselfly.

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from article Odonata

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Libellulid dragonflies mating.

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from article Salmonelloses

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A colorized scanning electron micrograph of Salmonella enterica serovar Enteritidis. Small cells with filaments and a few large, rod-shaped cells without filaments are observed. The Salmonella enterica foodborne pathogen can cause enteric…

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from article Salmonelloses

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Phases of typhoid fever. Salmonella enterica serovar Typhi bacilli invade the intestinal villi and their associated blood vessels, causing ulcers and perforations in the intestinal wall. The bacilli are also carried to the liver and spleen.…

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from article Enteropneusta

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Saccoglossus, the tongue worm or acorn worm. (a) Dorsal view. (b) Median section of anterior portion. (After T. I. Storer et al., General Zoology, 6th ed., McGraw-Hill, New York, 1979)

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from article Enteropneusta

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Tornaria larva. (After T. I. Storer et al., General Zoology, 6th ed., McGraw-Hill, New York, 1979)

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