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from article Yeast

Colorized scanning electron micrograph (SEM) of Schizosaccharomyces pombe yeast. This single-celled fungus is studied widely as a model organism for eukaryotic cell division. It is a rod-shaped yeast that grows by elongation at its ends, and it…

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from article Yeast

Cell shapes of yeasts are extremely varied: (a) rectangular; (b) pear-shaped; (c) apiculate; (d) ogival; (e) spherical; (f) globose; (g) ellipsoidal (oval); (h) elongate; (i) tetrahedral.

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from article Yeast

Colorized scanning electron micrograph (SEM) of cells of brewer's yeast (Saccharomyces cerevisiae). This yeast consists of single vegetative cells. Small daughter cells can be seen budding off from the larger cells. Saccharomyces cerevisiae ferments…

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from article Yeast

Yeast mycelia. (a) A true septate mycelium showing a break to form an arthrospore. (b) A pseudomycelium.

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from article Yeast

Heterothallic (bifactorial) life cycle of a basidiomycetous yeast, Leucosporidium scottii.

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from article Yeast

A fluorescent antibody stain reveals the oval budding yeast cells of Candida albicans. This yeast is the most common human fungal pathogen. (Credit: Maxine Jalbert and Leo Kaufman/Centers for Disease Control and Prevention)

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from article Flax

Flax plants (Linum usitatissimum) in bloom. (Photo by Howard F. Schwartz, Colorado State University)

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from article Flax

Flaxseeds. (Photo by Jose Hernandez, U.S. Department of Agriculture–Natural Resources Conservation Service PLANTS Database)

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from article Flax

Yellow wilted leaves of flax plants infected by Fusarium oxysporum. (Photo by J. A. Hoes, Oilseed Diseases Image Collection, Western Committee on Plant Disease, Winnipeg, Manitoba, Canada)

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from article Flax

Blighted and moldy flaxseeds. (Photo by J. A. Hoes, Oilseed Diseases Image Collection, Western Committee on Plant Disease, Winnipeg, Manitoba, Canada)

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from article Beer

Grains of (a) barley before malting and (b) hop plant. (Credit: U.S. Department of Agriculture)

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from article Beer

Fermentation tanks. (Credit: ClarkandCompany/Getty Images)

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from article Peppermint

Peppermint (Mentha piperita). (Photo by Michael Thompson, Agricultural Research Service, U.S. Department of Agriculture)

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from article Citron

Citron (Citrus medica), including cross sections of the fruit. (Photo courtesy of California Citrus Clonal Protection Program)

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from article Foodborne disease

Trichrome-stained photomicrograph of a Giardia lamblia trophozoite (a growing stage in the life cycle of certain protozoan parasites). This microorganism often causes giardiasis (a diarrheal foodborne illness). (Credit: Melanie Moser/Centers for…

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from article Foodborne disease

A cluster of norovirus particles. (Credit: Charles D. Humphrey/Centers for Disease Control and Prevention)

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from article Foodborne disease

Colored scanning electron micrograph showing Salmonella enterica bacteria (serotype Typhimurium; colorized red) invading an immune cell (colorized yellow). This bacterial species commonly causes food-associated gastroenteritis. (Credit: National…

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from article Foodborne disease

Close-up view of Campylobacter jejuni bacteria. This scanning electron microscope image shows the characteristic spiral (or corkscrew) shape of C. jejuni cells. (Credit: De Wood and Chris Pooley/Agricultural Research Service, U.S. Department of…

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from article Cabbage

Cabbage (Brassica oleracea var. capitata). (Joseph Harris Co., Inc., Rochester, New York)

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from article Hyperbolic navigation system

Typical grid of hyperbolic lines of position formed by a master (M) and two secondary stations (W and X).

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from article Hyperbolic navigation system

Individual lines of position from a master and two secondaries at location P. γ =LOP crossing angle.

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from article Hyperbolic navigation system

Typical curves of constant horizontal dilution of precision (HDOP) for a master (X) and two secondary stations (X and Y). Numbers give HDOP values of contours.

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from article Taste

Taste buds in a circumvallate papilla in a mouse tongue with taste cells visualized in color by cell-type-specific fluorescent antibodies. (Credit: Aki Taruno/Perelman School of Medicine, University of Pennsylvania)

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from article Taste

Illustration of the internal structures of a taste bud, which is composed of basal stem cells and three types of taste cells (dark, light, and intermediate). Taste cells extend from the base of the taste bud to the taste pore, where microvilli…

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from article Taste

Lemons and lemonade taste sour because they are very acidic and have a high concentration of hydrogen (H+) ions. (Credit: Mad Circles/Getty Images)

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from article Taste

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from article Lespedeza

Sericea lespedeza (Lespedeza cuneata). (Photo by Chuck Bargeron, University of Georgia; Bugwood.org)

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from article Milk

Dairy cow milking operation. (Credit: Yadamons/Getty Images)

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from article Milk

Milk and milk products yogurt and mozzarella. (Credit: Lilyana Vynogradova/iStockphoto/Getty Images)

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from article Sisal

Sisal (Agave sisalana). (Photo courtesy of Peter Lapshin)

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from article Wool

Sheep at a research facility near Dubois, Idaho. (Photo courtesy of the Agricultural Research Service, U.S. Department of Agriculture)

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from article Wool

Longitudinal section of a completely developed nonmedullated wool follicle, including sebaceous and sweat glands.

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from article Wool

Cuticle, cortex, and medulla of a wool fiber.

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from article Wool

Scale formation of Delaine Merino wool fibers.

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from article Wool

Fine wool staples showing distinct crimp (wavy) patterns. The length shown is the minimum for each classification.

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from article Brazil nut

Unshelled Brazil nuts (Bertholletia excelsa). (Photo courtesy of C. E. Timothy Paine)

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from article Castor plant

Seeds of the castor plant (Ricinus communis). These seeds, which are also known as castor beans, are processed to make castor oil. (Photo by Brian Prechtel, Agricultural Research Service, United States Department of Agriculture)

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from article Cowpea

Cowpea (Vigna unguiculata): pods and leaves. (Photo by Howard F. Schwartz, Colorado State University)

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from article Cowpea

Cowpea seeds, which are often called black-eyed peas. (Photo by Joseph Berger; Bugwood.org)

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from article Kumquat

Fruits and foliage of the Nagami kumquat (Fortunella margarita). (Photo by Forest and Kim Starr)

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from article Mulberry

White mulberry (Morus alba). (Photo courtesy of Forest and Kim Starr)

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from article Beech

Leaf on top of bark of American beech (Fagus grandifolia). (Photo courtesy of Robert H. Mohlenbrock, USDA–NRCS PLANTS Database)

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from article Beech

Beechnuts of the American beech (Fagusgrandifolia). (Photo courtesy of Steve Hurst, USDA–NRCS PLANTS Database)

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from article Schuler pendulum

Basic principles illustrated by (a) simple pendulum; (b) Earth-radius pendulum; (c) solid pendulous rod.

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from article Schuler pendulum

Behavior of pendulous rod when accelerated about Earth. (a) Short-period pendulous rod. (b) Schuler-period pendulous rod. (c) Nonpendulous rod.

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from article Schuler pendulum

Gyropendulum; thrust bearing provides extra freedom, necessary for gyroscopic action.

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from article Schuler pendulum

Principle of Schuler-tuned stable platform.

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from article Marjoram

Close-up view of marjoram (Majorana hortensis; alternatively Origanum majorana). (Photo courtesy of Forest and Kim Starr)

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from article Chestnut

American chestnut (Castanea dentata). (Photo courtesy of Forest and Kim Starr)

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from article Chestnut

Nuts of the Allegheny chinquapin (Castanea pumila). (Photo courtesy of Steve Hurst, USDA–NRCS PLANTS Database)

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from article Caraway

Caraway (Carum carvi) fruits (often called “seeds”). Scale bar = 1 mm. (Photo by Steve Hurst; USDA–NRCS PLANTS Database)

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from article Air navigation

Typical wind triangle, drawn to scale. 1 knot = 1 nmi/h = 0.514 m/s.

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from article Air navigation

Electronic map display developed by a flight management computer on the pilot's instrument panel of a Boeing 767 airplane. (United Airlines)

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from article Air navigation

Loran C chain GRI 7980 in the southeastern United States, comprising master station M and slave stations W, X, Y, and Z. A position fix is shown at point A, where the lines of position 7980-Y-45000 and 7980-Z-61000 intersect.

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from article Dallis grass

Dallis grass (Paspalum dilatatum). (Photo courtesy of Larry Allain, USGS National Wetlands Research Center)

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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 Sextant

Marine sextant.

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from article Sextant

Periscopic sextant for use in aircraft.

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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 Casein

Flow chart of production of commercial casein products from skim milk.

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from article Casein

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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 Air-traffic control

Terminal radar controller's plan view display. Aircraft positions are shown by radar returns. Display is centered on primary airport with parallel and intersecting runways. Range rings are spaced 5 mi (9 km) apart. Airspace within boundary and above…

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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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