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from article Poplar
Quaking aspen (Populus tremuloides). (Photo courtesy of North Dakota State Soil Conservation Committee, USDA–NRCS PLANTS Database)
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from article Poplar
Common poplar species. (a) Quaking aspen (P. tremuloides); leaf scar with an axial bud, leaf, and twig. (b) Bigtooth aspen (P. grandidentata); leaf, terminal bud, and twig. (c) Cottonwood poplar (P. deltoides); leaf, leaf scar, terminal bud, and…
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from article Hyperbolic geometry
Examples of simple hyperbolic knots and links. (a) Figure-8 knot. (b) Whitehead link.
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from article Thirst and sodium appetite
Regulation of cellular water. ADH = antidiuretic hormone.
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from article Thirst and sodium appetite
Hypovolemic thirst and sodium appetite are caused by altered sensory information from an underfilled circulation, reinforced by increases in circulating angiotensin II and mineralocorticoids. Angiotensin peptides generated from components of a…
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from article Osage orange
Fruit and foliage of osage orange (Maclura pomifera). (Photo copyright © Karren Wcisel)
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from article Magnolia
Flowers and leaves of the southern magnolia (Magnolia grandiflora). (Photo courtesy of Forest and Kim Starr)
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from article Hackberry
Hackberry (Celtis occidentalis). (Photo courtesy of North Dakota State Soil Conservation Committee, USDA–NRCS PLANTS Database)
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from article Rosemary
Leaves of rosemary (Rosmarinus officinalis). (Photograph courtesy of Forest and Kim Starr)
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from article Squash
Zucchini (Cucurbita pepo), a type of summer squash, with flowers. (Credit: Howard F. Schwartz, Colorado State University/www.Bugwood.org)
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from article Squash
Crookneck squash (Cucurbita moschata). (Credit: Howard F. Schwartz, Colorado State University/www.Bugwood.org)
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from article Squash
Delicata squash (Cucurbita pepo), a variety of winter squash. (Credit: Shaun Case)
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from article Squash
Leaves of Cucurbita pepo infected by a squash mosaic virus. (Credit: William M. Brown, Jr./www.Bugwood.org)
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from article Speech
Human head and thorax. (Courtesy of G. E. Peterson)
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from article Speech
Action of the glottis during speech. (a) Six successive positions of the vocal folds in one vibration cycle at 120 Hz. (b) Relation between pitch and vocal fold tension. (Courtesy of D. W. Farnsworth)
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from article Speech
Sound spectrograms of the utterance “speech production.” (a) Energy patterns: A, pulse; B, periodic; C, aperiodic; and D, silence. (b) The dotted lines represent the pitch pattern of the utterance.
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from article Speech
Computer-generated three-dimensional spectral display of the spoken syllable “yah.”
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from article Speech
Speech flakes of vowels in the words (a) “far,” (b) “food,” and (c) “fee.” (Courtesy of Charles Wooters)
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from article Speech
Regions of the brain involved in speech. (a) Left hemisphere, usually more involved in speech functions than the right hemisphere. (b) A model for the neural processes involved in speaking a heard word. Arrows indicate the path of the relayed signal…
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from article Llama
The llama (Lama glama) of South America.
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from article Cashew
Cashew (Anacardium occidentale). The cashew nut is contained in a hard shell at the bottom of the fruit (cashew apple). (Photo courtesy of Laura Lartigue, U.S. Agency for International Development, Guinea)
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from article Winged bean
Winged bean (Psophocarpus tetragonolobus). (Photo by Forest and Kim Starr)
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from article Garlic
Bulbs of garlic (Allium sativum). (Photograph by Forest and Kim Starr)
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from article Mental disorders
X-ray of a human brain (side view) against a black background. The image is transparent and detailed with soft blue swaps. (Credit: Brainmaster/Getty Images)
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from article Mental disorders
Colorized CT (computerizd tomography) scan of a healthy brain (view from above). The axial (horizontal) scan has revealed the head and brain in cross section. The front of the head is at the top. The ventricles (dark areas, center), which lie…
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from article Coriander
Coriander seeds (Coriandrum sativum). (Photograph courtesy of Steve Hurst, USDA–NRCS PLANTS Database)
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from article Strawberry
June-bearing strawberries (Fragaria × ananassa), which are produced in early summer. (Photo courtesy of Kimberly Lewers, Agricultural Research Service, United States Department of Agriculture)
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from article Strawberry
Botrytis cinerea fungal sporulation on a ripe strawberry. (Photo courtesy of Scott Bauer, Agricultural Research Service, United States Department of Agriculture)
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from article Oats
Oats (genus Avena). (Photo by Jan Samanek, State Phytosanitary Administration, Czech Republic)
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from article Oats
Oat panicles with many branches and spikelets. (Photo by Jan Samanek, State Phytosanitary Administration, Czech Republic)
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from article Oats
Oat florets. Scale bar = 1 cm (0.4 in.). (Photo by Steve Hurst, USDA–Natural Resources Conservation Service PLANTS Database)
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from article Oats
Crown rust on oat leaves. This devastating disease is caused by Puccinia coronata. (Photo courtesy of the USDA Agricultural Research Service)
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from article Oats
Stem rust infection (caused by Puccinia graminis) on oat stems. (Photo by Howard F. Schwartz, Colorado State University)
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from article Progression (mathematics)
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from article Agronomy
Relationship of agronomy to basic sciences, related fields, and practical farming methods.
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from article Forest ecosystem
Forest in Moran State Park on Orcas Island, Washington. (Credit: Chris Willig)
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from article Forest ecosystem
Forest fire in No Name Creek area of Colorado. (Credit: Andrea Booher/FEMA)
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from article Forest ecosystem
Puma and cub in forest. (Credit: Grant Faint/Stockbyte/Getty Images)
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from article Forest ecosystem
Conceptual model of elemental cycling in a terrestial ecosystem, emphasizing the presence and activities of arthropod consumers. The indirect regulation of elemental movement by arthropods is indicated by the hourglass-shaped valves on these flows.…
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from article Forest ecosystem
The southern pine beetle (Dendroctonus frontalis) is a destructive insect pest of coniferous forests in the southern United States. (Credit: U.S. Forest Service)
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from article Forest ecosystem
Belowground food web. (Credit: Elaine Ingham)
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from article Tangent
Line L tangent to curve C at P.
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from article Beef cattle production
Angus bull with overall carcass merit. (Credit: Jim Koch/Agricultural Research Service, U.S. Department of Agriculture)
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from article Beef cattle production
Brahman (zebu) bull (Bos indicus). (Credit: Scott Bauer/Agricultural Research Service, U.S. Department of Agriculture)
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from article Beef cattle production
An exemplary purebred Hereford bull. (Credit: Michael MacNeil/Agricultural Research Service, U.S. Department of Agriculture)
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from article Beef cattle production
A group of Simmental cows. (Credit: Iowa Beef Industry Council)
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from article Beef cattle production
Three Charolais heifers. (Credit: Darcy Vial/Farm Service Agency, U.S. Department of Agriculture)
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from article Beef cattle production
In order to attain market weight, cattle are fed often in feedlots. (Credit: Dave Hughes/Getty Images)
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from article Beef cattle production
In the United States, beef animals used for food must be inspected extensively pre- and postmortem by federal officials. (Credit: Bob Nichols/U.S. Department of Agriculture)
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from article Fruit, tree
Apple trees growing in an orchard. (Photo by Charles Rondeau)
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from article Fruit, tree
Apple scab on fruit. This disease, caused by the fungus Venturia inaequalis, leads to unsightly blemishes on ripe apples. (Photo courtesy of the University of Georgia Plant Pathology Archive)
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from article Fruit, tree
Brown rot, caused by the fungus Monilinia fructicola, on a peach. (Photo by Jonas Janner Hamann, Universidade Federal de Santa Maria, Brazil)
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from article Fruit, tree
Fire blight, caused by the bacterium Erwinia amylovora, on apple fruits and leaves. (Photo courtesy of the University of Georgia Plant Pathology Archive)
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from article Fruit, tree
Blue mold (Penicillium italicum) on a rotting orange. (Photo by G. L. Barron)
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from article Oriental vegetables
Bok choy, also known as pak choy or Chinese mustard (Brassica rapa or Brassica campestris, chinensis group). (Photo courtesy of the Agricultural Research Service, U.S. Department of Agriculture)
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from article Oriental vegetables
Oriental winter radish or daikon (Raphanus sativus, longipinnatus group). (Photo by Franco Folini)
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from article Oriental vegetables
Mung bean sprouts (Vigna radiata).
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from article Oriental vegetables
Chinese okra (Luffa acutangula). The length of the fruit can reach 30–38 cm (12–15 in.). (Photo by Forest and Kim Starr)
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from article Ebony
Persimmon (Diospyros virginiana). (Photograph by Dot Paul, National Resources Conservation Service, USDA)
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from article Tangerine
Tangerine fruits (Citrus reticulata). (Photo by Forest and Kim Starr)
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from article Forage crops
Bahia grass (Paspalum notatum), a popular warm-season grass used as a forage crop. (Photo by James H. Miller and Ted Bodner, Southern Weed Society)
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from article Forage crops
Alfalfa (Medicago sativa), the most important legume forage crop, cut and drying prior to its final harvest. (Photo by Howard F. Schwartz, Colorado State University)
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from article Nitrogen-fixing trees
A perennial nodule, several years old, formed on the roots of common or black alder (Alnus glutinosa) by symbiosis with the nitrogen-fixing bacterium Frankia.
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from article Wheat
A sheaf of wheat (Triticum) surrounded by some small piles of seed (grain). (Credit: Scott Bauer/Agricultural Research Service, U.S. Department of Agriculture)
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from article Wheat
A combined harvester-thresher is used to harvest wheat. (Credit: Scott Bauer/Agricultural Research Service, U.S. Department of Agriculture)
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from article Wheat
Adaptation regions for wheat in the United States. (Credit: U.S. Department of Agriculture)
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from article Wheat
Wheat (Triticum) growing in a field. The wheat inflorescence is a spike bearing sessile spikelets arranged alternately on a zigzag rachis (main axis). (Credit: Tim McCabe/Natural Resources Conservation Service, U.S. Department of Agriculture)
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from article Wheat
Black stem rust of wheat, which produces urediniospores in reddish-brown pustules. The fungus Puccinia graminis f. sp. tritici is responsible for this plant disease. The inset shows a close-up view of an infected stem. (Credit: Agricultural Research…
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from article Wheat
Loose smut of wheat, caused by Ustilago tritici. (Credit: Erik Stromberg/Virginia Polytechnic Institute and State University)
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from article Conic section
Four conic sections. (a) Circle. (b) Ellipse. (c) Parabola. (d) Hyperbola.
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from article Ginger
A rhizome of ginger (Zingiber officinale). (Photo courtesy of Milan Kořínek)
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from article Reforestation
Forests and people in the world.
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from article Reforestation
Relative amounts of land needed to produce 1000 ft3 of wood per year. (1) Mature, upland, natural hardwood stand. (2) Pine plantation owned by a farmer and managed with minimum inputs. (3) Pine plantation managed by a forest company and managed with…
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from article Guava
Fruit and leaves of the guava (Psidium guajava). (Photo courtesy of Forest and Kim Starr)
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from article Tupelo
Leaves of black tupelo (Nyssa sylvatica). (Photograph courtesy of Larry Allain, USGS National Wetlands Research Center)
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from article Kentucky coffee tree
Seeds of the Kentucky coffee tree (Gymnocladus dioica). (Photo courtesy of Steve Hurst, ARS Systematic Botany and Mycology Laboratory, USDA–NRCS PLANTS Database)
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from article Kentucky coffee tree
Kentucky coffee tree (Gymnocladus dioica). (a) Parts of branch showing leaf scars and winter buds. (b) Branch.
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from article Pistachio
Pistachios (Pistacia vera) from California. (Photo by Scott Bauer, Agricultural Research Service, U.S. Department of Agriculture)
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from article Catenary
Catenary and force triangle which keeps a portion of the string in equilibrium.
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from article Catenary
Relation of catenary to the tractrix which is its involute.
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from article Legendre functions
Legendre polynomials Pn(x), n = 2, 3, 4, 5.
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from article Legendre functions
Legendre functions of the second kind, Qn(x). (After E. Jahnke and F. Emde, Tables of Functions with Formulae and Curves, 4th ed., Dover Publications, 1945)
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from article Circle
A circle, with radius, diameter, and circumference indicated. (Credit: McGraw-Hill Education)
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from article Circle
Nine-point circle and Euler line PMH.
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from article Goat production
Domesticated goats (Capra hircus) raised for meat goat production. (Photo by Susan Boyer, Agricultural Research Service, U.S. Department of Agriculture)
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from article Goat production
Close-up view of a Saanen goat. (Photo by Milan Kořínek)
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from article Goat production
Mechanical (automatic) milking of a purebred Nigerian Dwarf dairy goat on an elevated stand. (Photo courtesy of Lesa Wilke, Bramblestone Farm, Ohio; www.bramblestonefarm.com)
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from article Trihedron
Trihedron and trihedral angles.
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from article Trihedron
Spherical triangle ABC formed by intersection of sphere with a trihedron. The center of the sphere is at the vertex of the trihedron.
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from article Apple
Empire apple (Malus pumila). (Credit: Peggy Greb, Agricultural Research Service, United States Department of Agriculture)
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from article Apple
Apple trees in an orchard in late autumn. (Credit: Sandrine Bouvier/Alamy)
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from article Wood anatomy
Annual tree rings are distinct features of wood anatomy. The combined concentric bands of light and dark areas can help investigators to determine the age of a tree. (Credit: DrimaFilm/Shutterstock)
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from article Wood anatomy
Light micrograph of a section through the stem of a lime tree (genus Tilia). The pith is at the center and is surrounded by a layer of wood (xylem). A thin cambium separates this from the phloem. An outer layer of collenchyma is enclosed by the…
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from article Wood anatomy
Structure of a typical hardwood. (Credit: U.S. Department of Agriculture)
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from article Wood anatomy
Structure of a typical softwood. (Credit: U.S. Department of Agriculture)
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from article Potato, Irish
Irish potato (Solanum tuberosum). (Photo by Peggy Greb, Agricultural Research Service, U.S. Department of Agriculture)
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from article Potato, Irish
Diagram of a potato plant. [Adapted from R. E. Thornton and J. B. Sieczka (eds.), Commercial Potato Production in North America, Potato Association of America, Orono, ME, 1980]
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from article Potato, Irish
Irish potato tubers infected by late blight (Phytophthora infestans). (Photo by G. D. Franc; Bugwood.org)
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from article Gamma function
Depiction of gamma function Γ(z) for real values of z.
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from article Human-factors engineering
Human-factors engineers design modern computer equipment, including ergonomic keyboards and mouse devices, to accommodate the varied physical contours and dimensions of the human hand. (Credit: JG Photography/Alamy)
