Image
from article Anostraca
Branchinecta paludosa, male, small specimen, lateral aspect.
Search Results
Search Results
Refine this search
Search result paging links
4,268 results
Image
from article Bone disorders
A colored x-ray of the hand of a patient with severe rheumatoid arthritis in all of the fingers. (Credit: Science Photo Library/Alamy Stock Photo)
Image
from article Bone disorders
A colored X-ray of a linear displacement fracture of an ulna (forearm bone) of a man. (Credit: Puwadol Jaturawutthichai/Shutterstock)
Image
from article Bone disorders
Comparison of a healthy normal bone (left) and a bone with osteoporosis (right). Osteoporosis leads to a decrease in bone mass and density, causing bones to become weak and brittle. (Credit: Stocktrek Images/Alamy Stock Photo)
Image
from article Salmon farming
Adult Atlantic salmon (Salmo salar). (Credit: William Hartley/U.S. Fish and Wildlife Service)
Image
from article Salmon farming
Atlantic salmon (Salmo salar) at a pre-smolt stage. (Credit: Edward Peter Steenstra/U.S. Fish and Wildlife Service)
Image
from article Salmon farming
A congregation of coho salmon (Oncorhynchus kisutch) released from a hatchery. Investigators continue to study the effects of farmed fish on neighboring populations of wild salmonids. (Credit: Salmon Ecology Team/Southwest Fisheries Science Center,…
Image
from article Suctoria
Endogenous budding in the suctorian Podophrya, a species which measures 10–28 μm.
Image
from article Jawless vertebrate
Interrelationships of jawless and jawed vertebrates, showing the distribution of some major evolutionary steps. (Copyright © McGraw Hill)
Image
from article Organoid
Generation of an organoid and some of its therapeutic potential. To date, organoids can be derived from patient-derived induced pluripotent stem cells (iPSCs). Like organogenesis in vivo, organoids self-organize through cell differentiation, cell…
Image
from article Organoid
A flowchart outlining the basic steps to create a cerebral organoid. The process takes a span of months, and the size of the organoid is limited by the availability of nutrients.
Image
from article Schuler pendulum
Basic principles illustrated by (a) simple pendulum; (b) Earth-radius pendulum; (c) solid pendulous rod.
Image
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.
Image
from article Schuler pendulum
Gyropendulum; thrust bearing provides extra freedom, necessary for gyroscopic action.
Image
from article Schuler pendulum
Principle of Schuler-tuned stable platform.
Image
from article Psocoptera
Valenzuela flavidus, male (family Caeciliusidae): habitus (general appearance). Body length: 2.02 mm (0.08 in.).
Image
from article Psocoptera
Metylophorus novaescotiae, female (family Psocidae): habitus. Body length: 5.24 mm (0.2 in.).
Image
from article Psocoptera
(a–e) Mouthparts of a typical psocid, Echmepteryx hageni (family Lepidopsocidae): a = labrum, b = maxilla (l = lacinia), c = hypopharynx (li = lingual sclerite), d = mandible, e = labium. Scale: 0.1 mm (0.004 in.). (f) Wing venation of a typical…
Image
from article Psocoptera
Liposcelis brunnea, female (family Liposcelididae): habitus of a cleared specimen. Body length: 1.1 mm (0.043 in.).
Image
from article Urine
Overview of the human urinary system. Urine production takes place in the kidneys. Ureters transport urine to the urinary bladder, where the urine is stored. Urine passes to the outside via the urethra. (Copyright © McGraw Hill)
Image
from article Psittaciformes
Sulphur-crested cockatoo (Cacatua galerita). (Photo by Lloyd Glenn Ingles; copyright © California Academy of Sciences)
Image
from article Strigiformes
Northern spotted owl. (Photo by John and Karen Hollingsworth/U.S. Fish and Wildlife Service)
Image
from article Sloth
Pale-throated three-toed tree sloth (Bradypus tridactylus). (Credit: Lloyd Glenn Ingles; copyright © California Academy of Sciences)
Image
from article Chameleon
A short-horned chameleon (Calumma brevicorne, family Chamaeleonidae), which is a representative species found in Madagascar. (Credit: Gerald and Buff Corsi; copyright © California Academy of Sciences)
Image
from article Bioterrorism
Civilians are the prime targets in bioterrorist attacks. During World War II, gas masks with filters were distributed to British civilians because of fears of a chemical agent attack. (Credit: Ingram Publishing/SuperStock)
Image
from article Bioterrorism
A color-enhanced scanning electron micrograph (SEM) showing splenic tissue from a monkey with inhalation anthrax. Rod-shaped bacilli of Bacillus anthracis (yellow) and an erythrocyte (red) are shown. (Credit: Arthur Friedlander/National Institute of…
Image
from article Infarction
Magnified gross photograph of a wedge-shaped infarct of kidney (I). Renal cortex (C), medullary pyramid (M), and renal pelvis (P) can be seen.
Image
from article Infarction
Gross photograph of a brain section, showing a wedge-shaped infarct (I) that resulted from a thrombus. Secondary hemorrhage has occurred.
Image
from article Stichosomida
Anterior end of Trichinella spiralis showing stichosome. (Adapted from B. G. Chitwood, 1930)
Image
from article Stichosomida
Portion of the stichosome of the whipworm, Trichuris trichiura. (Photomicrograph by Sung-Jong Hong, The Korean Society for Parasitology)
Image
from article Centrohelida
Centrohelida. (a) Raphidiophrys ambigua. (b) Acanthocystis erinaceoides.
Image
from article Hemiptera
Phylogenetic relationships among the extant Hemiptera groups.
Image
from article Hemiptera
Image
from article Hemiptera
Image
from article Hemiptera
Mouthparts and method of feeding of a plant bug.
Image
from article Hemiptera
Plant pests. (a) A colony of aphids on a rose shoot. (b) The citrus mealybug. (Ohio Agricultural Experiment Station)
Image
from article Hemiptera
An aphid (dorsal aspect).
Image
from article Hemiptera
Anterior dorsum of various Auchenorrhyncha: (a) cicada; (b) fulgoroid (apical part of antenna omitted); (c) another species of fulgoroid; (d) cercopid; (e) membracid, anterior view of face and pronotum.
Image
from article Hemiptera
Membracids on stems: (a) adult; (b) nymphs. (Courtesy of C. H. Hanson)
Image
from article Hemiptera
Peloridora kuscheli China (Peloridiidae).
Image
from article Hemiptera
Triatoma pallidipennis (Reduviidae). (Photo by E. S. Ross)
Image
from article Hemiptera
External anatomy of a typical bug.
Image
from article Hemiptera
Squash bug. (Photo by Scott Bauer, Agricultural Research Service, U.S. Department of Agriculture)
Image
from article Hemiptera
Brown marmorated stink bug (Halyomorpha halys): adult (top) and fifth-instar nymph (bottom). (Photo by Stephen Ausmus, Agricultural Research Service, U.S. Department of Agriculture)
Image
from article Hemiptera
Oblique-dorsal view of a bedbug, Cimex lectularius. (Photo by Piotr Naskrecki, Public Health Image Library)
Image
from article Hemiptera
Nymph of the tarnished plant bug (Lygus lineolaris). (Photo by Scott Bauer, Agricultural Research Service, U.S. Department of Agriculture)
Image
from article Amphetamine
Molecular structures of amphetamine and methamphetamine (a chemical derivative of amphetamine). (Copyright © McGraw-Hill Education)
Image
from article Obolellida
Obolella. (a) Shell exterior (after J. Hall and J. M. Clarke, An introduction to the study of the Brachiopoda intended as a handbook for the use of students, Report of the N.Y. State Geologist for 1891, 1894). (b) Dorsal valve interior, and (c)…
Image
from article Caraway
Caraway (Carum carvi) fruits (often called “seeds”). Scale bar = 1 mm. (Photo by Steve Hurst; USDA–NRCS PLANTS Database)
Image
from article Air navigation
Typical wind triangle, drawn to scale. 1 knot = 1 nmi/h = 0.514 m/s.
Image
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)
Image
from article Air navigation
Loran C chain GRI 7980 in the southeastern United States, comprising primary station M and secondary 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.
Image
from article Albuliformes
Albula vulpes. (Courtesy of C. Q. Jessen)
Image
from article Mollusca
Higgins eye pearly mussels (Lampsilis higginsii). (Credit: U.S. Fish and Wildlife Service)
Image
from article Mollusca
Snails are assigned to the class Gastropoda in the phylum Mollusca. (Credit: Zuzha/Shutterstock)
Image
from article Mollusca
Generalized model of a stem mollusk (or archetype) in side view. There are three distinct regions in the molluscan body: head-foot, visceral mass, and mantle-shell. Water circulation through the mantle cavity, gills (ctenidia), and pallial complex…
Image
from article Mollusca
Arrangement of the mantle and shell layers in mollusks. The fleshy mantle margin is divided into three lobes, and the outer pallial lobe is largely responsible for secretion of the three layers of the shell. (Credit: W. D. Russell-Hunter)
Image
from article Mollusca
Aspidobranch ctenidium (feather or plume gill) as found in primitive gastropods and other molluscan groups. (a) Stereogram showing the water current from the ventral inhalant to the dorsal exhalant between adjacent gill plates; this current is…
Image
from article Mollusca
Common octopus (Octopus vulgaris). (Credit: Aerial-motion/Shutterstock)
Image
from article Lethal dose 50
Cumulative population response to increasing doses of a toxic material is indicated. The LD50 indicates the dose that is lethal to half (50%) of the population. (Copyright © McGraw Hill)
Image
from article Heterotrichida
Climacostomum, an example of a heterotrich.
Image
from article Paleoecology
Zonation of Silurian (425 million year old) marine communities in the Welsh Basin, United Kingdom. Marine animal communities were typically arranged in belts parallel to the shoreline and related to water depth. A classic study using fossil…
Image
from article Paleoecology
Classification of shales in terms of percentages of three benthic habitat groups: epifaunal suspension-feeding bivalves (those living at the sediment-water interface and filtering seawater), infaunal (living within and feeding on the sediment), and…
Image
from article Paleoecology
Comparison of four developmental stages in four ancient reef masses. (After K. R. Walker and L. P. Alberstadt, Ecological succession as an aspect of structure in fossil communities, Paleobiology, 3:238–257, 1975)
Image
from article Paleoecology
Formation and burial sequence of Bobcaygeon hardground. (a) Soft-bottom community of strophomenid brachiopods and infaunal burrowers inhabiting carbonate mud. (b) Hardground community consisting of boring and encrusting organisms. (c)…
Image
from article Paleoecology
Tiering or vertical depth stratification in marine communities through time. Note the rapid rise of the highest-tier (level) organisms (crinoids or sea lilies, bryozoans) from a few centimeters to over a meter above the sea floor during the…
Image
from article Paleoecology
The three great marine evolutionary faunas of the Phanerozoic. The Cambrian fauna, composed of trilobites, primitive groups of brachiopods, and mollusks, arose early during that period to a diversity of about 50 families, and then dwindled during…
Image
from article Coral reef structural complexity
A fire coral before and after bleaching, which can occur when coral are environmentally stressed. The fire coral on the left is healthy, whereas the one on the right is completely bleached. (Credit: XL Catlin Seaview Survey)
Image
from article Coral reef structural complexity
Underwater photographs of Cane Bay (St. Croix, U.S. Virgin Islands) in 1980 (left) and 2007 (right). Note the common overgrowth of fleshy macroalgae between the sparsely distributed corals in 2007 compared to the more open substrate in 1980 between…
Image
from article Coral reef structural complexity
Historical changes related to coral reef decline since the 1600s. The emergence of temperature-related responses (bleaching and disease) is coincident with the loss of urchins (Diadema) and the increase of nutrient loading.
Image
from article Coral reef structural complexity
Three dominant shallow-water communities in the waters surrounding Easter Island. (Left) Since the 1950s, fleshy algae, such as Sargassum, were the dominant cover, and coral was rare in shallow waters. (Middle) In the 1980s, global climate change…
Image
from article Velatida
Abactinal surface of Pteraster tesselatus. (In radially symmetrical animals, the abactinal surface pertains to the surface opposite the side where the mouth is located.)
Image
from article Velatida
Cross section through an arm of Pteraster tesselatus, showing the supradorsal membrane (SD) and tube feet (TF).
Image
from article Velatida
Abactinal surface of Solaster endeca.
Image
from article Volvocida
Carteria, showing equal plural flagella.
Image
from article Volvocida
Morphological features of Volvox. (a) Volvox globator, sectional view; (b) surface view of a single zooid. (c) Volvox aureus, sectional view; (d) sperm, enlarged about eight times by comparison with c.
Image
from article Respiratory pigments (invertebrate)
Electron micrograph of hemocyanin molecules from the snail Helix pomatia, showing “pillbox” subunit structure. Circular forms show subunits in a tenfold symmetrical array. There are six parallel rows of subunits in the rectangular forms.
Image
from article Cerebral palsy
The spastic forms of cerebral palsy include diplegia, hemiplegia, and quadriplegia. Diplegia refers to greater involvement of the legs and lesser involvement of the arms, hands, and trunk. Hemiplegia refers to involvement of one side of the body…
Image
from article Nutraceutical
Various nutraceuticals are derived from fresh foods with healthy fats and omega-3 fatty acids. (Credit: Julija Dmitrijeva/123RF)
Image
from article Nutraceutical
Chemical structure of inulin, which is a polysaccharide found in a wide range of fruits and vegetables. (Copyright © McGraw Hill)
Image
from article Wavelets
Members of a wavelet family: an original and two shifted and dilated copies. (a) Original wavelet ψ with width w. (b) Large-scale wavelet ψa,b, with width aw that is larger than the original width w. (c) Fine-scale wavelet ψa,b with narrow width.
Image
from article Wavelets
Two examples of wavelets which generate an orthonormal basis, and which are associated with fast algorithms.
Image
from article Logic
Image
from article Logic
Image
from article Gasterosteiformes
Alligator pipefish (Syngnathoides biaculeatus). (Photograph copyright © J. E. Randall)
Image
from article Chronic obstructive pulmonary disease (COPD)
Types of lung damage in COPD: (left) a normal lung versus a lung with obstructive chronic bronchitis; (right) a normal lung versus a lung with emphysema. (Credit: J. Bourbeau, D. Nault, M. Sedeno, and D. Melanson/Living Well with COPD)
Image
from article Chronic obstructive pulmonary disease (COPD)
Spirometry test results for a normal individual and a COPD patient. During the test, patients are instructed to inhale a full breath and blow out the air as fast as they can. The volume of air that they can forcefully exhale in 1 second (1 s) is…
Image
from article Corn
Corn (Zea mays) growing in a field. (Credit: Bob Nichols, Agricultural Research Service/U.S. Department of Agriculture)
Image
from article Corn
Ear of field corn on a stalk. The husk has been peeled back to display the kernels (seeds). (Credit: Howard F. Schwartz, Colorado State University)
Image
from article Corn
The corn leaf at the top is more resistant against leaf blight than the severely damaged leaf on the bottom. (Credit: Keith Weller, Agricultural Research Service/U.S. Department of Agriculture)
Image
from article Corn
Gall of corn smut, caused by Ustilago maydis, on a stalk of corn. (Credit: H. J. Larsen)
Image
from article Corn
White ear rot and seedling blight on a corn ear. The pathogen responsible for the afflicted corn is Stenocarpella maydis. (Credit: U.S. Department of Agriculture Cooperative Extension Slide Series/Clemson University)
Image
from article Sugars (sweeteners)
Monosaccharides and disaccharides.
Image
from article Sugars (sweeteners)
Harvested sugarcane, Tamasopo, San Luis Potosi, Mexico. (Credit: Glow Images)
Image
from article Gonorrhea
Electron micrograph of Neisseria gonorrhoeae bacteria, which cause gonorrhea. (Credit: Centers for Disease Control and Prevention)
Image
from article Reptilia
Desert tortoise (Gopherus agassizii). (Credit: Robb Hannawacker/National Park Service)
Image
from article Reptilia
Western or variable ground snake (Sonora semiannulata). (Credit: Peter Paplanus)
Image
from article Reptilia
Greater short-horned lizard (Phrynosoma hernandesi). (Credit: Lake Mead National Recreation Area, Arizona–Nevada/National Park Service)
Image
from article Pegasidae
Short (little) dragonfish (Eurypegasus draconis) found in the waters off the Tayandu Islands, Indonesia. (Photo by Teddy Triandiza)
Image
from article Rotifera
Common species from the three rotifer groups. (a) The seisonid Seison nebaliae. (b) The bdelloid Philodina roseola. (c) The monogonont Brachionus plicatilis.
