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The components of a scanning electron microscope (SEM).

The components of a transmission electron microscope (TEM).

Diagram depicting the process of atoll formation. Atolls are formed from the remnant parts of sinking volcanic islands.

The process of cell division by mitosis.

General patterns of atmospheric circulation over an idealized Earth with a uniform surface and the actual Earth.

The diffusion of water across a semipermeable membrane.

The diffusion of potassium cations across a semipermeable membrane.

Changes in ion permeance underlying the action potential.

Differentiation of the external genitalia in the human embryo and fetus.

The endoplasmic reticulum plays an important role in the biosynthesis, processing, and transport of proteins and lipids.

Thermonuclear warhead

Transverse section of an artery.

Human arterial supply and venous drainage of the organs.

Diagram of a wave system depicting typical divergence and convergence distributions for non-tilting and tilting systems.

The onset and retreat of the West African monsoon with respect to the timing of the direct rays of the sun.

Diagram of a mammalian muscle spindle.

Automotive-type lead-acid battery, a storage battery that holds its charge for a long time and can be recharged.

Fission bomb designs

The mechanical components of a compound microscope.

Average exchange of energy between the surface, atmosphere, and space, as percentages of incident solar radiation.

The Michelson interferometer measures the effect on the speed of light of the motion of the ether through which light travels.

Three types of natural selection, showing the effects of each on the distribution of phenotypes within a population.

Stages in the process of meiosis, cell division among sexually reproducing organisms.

Receptor-mediated endocytosis enables cells to ingest molecules such as protein that are necessary for normal cell functioning.

The stages in the evolution of a wave (frontal) cyclone.

Horizontal divergence and convergence patterns associated with the polar-front jet.

Theoretical depiction of the movement of tectonic plates across Earth's surface.

Diagram of a human uterus during the fourth month of pregnancy.

Two types of pressure gauge: the U-tube manometer and the Bourdon-tube gauge.

Phylogeny based on differences in the protein sequence of cytochrome c in organisms ranging from Neurospora mold to humans.

Evolutionary history of the globin genes. The dots indicate the duplication of ancestral genes, giving rise to new gene lineage.

The steps involved in the engineering of a recombinant DNA molecule.

Basic components of an electrochemical cell.

Image formation in a microscope, according to the Abbe theory.

Cross section of a typical bomb calorimeter.

Diagram showing a healthy heart valve compared with a diseased heart valve and an artificial heart valve.

Theoretical diagram showing the effects of an advancing tectonic plate on other adjacent, but stationary, tectonic plates.

Light waves matching the orientation of the molecules of a polarizing filter are absorbed, reducing the intensity of the light.

Uniformly accelerated motion; s = speed, a = acceleration, t = time, and v = velocity.

In Ptolemy's geocentric model of the universe, the Sun, Moon, and each planet orbit a stationary Earth.

The artery wall and the ultrastructure of the smooth muscle cells within it.

Approaching the speed of light, an object appears shorter, with a longer time interval, relative to its intervals when at rest.

The 4-D space-time continuum is distorted in the vicinity of any mass, depending on the mass and the distance from the mass.

Diagram of an artificial pacemaker

Electron shell

Four main types of estuaries: A) salt wedge estuary, B) partially mixed estuary, C) vertically homogeneous estuary, D) fjord.

Cross section of a V-type engine.

Cross section of a crystal microphone.

Pluto and the Kuiper belt

Diagram demonstrating the difference between a normal heart and a heart with an atrial septal defect

The surface reflectance differences between a pre-agricultural (forest) and a modern agricultural (patchwork heating) landscape.

The weather model of meteorologist Edward Lorenz.

U.S. space station Skylab (occupied 1973-74), shown with docked Apollo Command and Service modules.

Moon interior

Speedometer

Spring balance

Rising air in an unstable atmosphere

Schematic drawing of the structure of a typical bacterial cell of the bacillus type.

Annual circulation patterns in a dimictic lake: stratification in the summer and complete overturn in the autumn and spring.

Vegetation profile of a temperate deciduous forest.

Elements of the traveling-wave tube (TWT), used to amplify microwave signals over broad bandwidths.

Blower-scavenged, two-stroke-cycle engine with uniflow scavenging, displaying both upstroke and downstroke.

Diesel engine equipped with a precombustion chamber.

Modern version of the Leclanche cell. This heavy-duty zinc-carbon primary battery is a dry cell with an immobilized electrolyte.

Seismic ray types in Earth's interior from earthquake at F.

Georges Leclanche's dry cell and its later variations, zinc chloride and alkaline cells, are batteries commonly used worldwide.

Space station Mir, after its completion in 1996, with the launch dates of each modular component shown.

A heart-lung machine diverts blood from the body to an oxygenator, which removes CO2, adds O2, and returns the blood to the body

Electromagnetic spectrum. The visible range (shaded portion) is shown enlarged on the right.

Electrical conduction in the heart in healthy individuals is controlled by pacemaker cells in the sinoatrial node.

Annual temperature and precipitation patterns for several locations with different climatic conditions.

Four types of gasoline engines: opposed-piston engine, rotary engine, in-line engine, and V-type engine.

Blood alcohol concentration

Blood alcohol concentration

Relationships of endocrine glands, from the pituitary-hypothalamus system to the vertebrate endocrine glands and their hormones.

A cross section of Earth's outer layers, from the crust through the lower mantle.

Asteroid distribution

Venus's middle and lower atmosphere

Pluto-Charon mutual eclipses

Near-Earth objects

Uranus's orbit

Nuclear blast and radiation effects

Vegetation profile of a desert.

Vegetation profile of tropical mountain lands.

The analysis of sound frequencies by the basilar membrane.

Cross section comparing the left ventricular wall of normal heart to a left ventricular wall that has experienced hypertrophy.

Bohr atomic model

Diagram of a two-cavity klystron, used as an amplifier and RF signal source at microwave frequencies, and also as an oscillator.

Elements of a magnetron, used to generate power for radar systems, microwave ovens, plasma screens, and linear accelerators.

A tokamak is a toroidal magnetic confinement system used as a method of achieving fusion energy.

The Hardy-Weinberg Law applied to two alleles.

The journey of the Galileo spacecraft to Jupiter, highlighting major observations along the trajectory, as well as their dates.

Basic characteristics of orbits in which a satellite can be placed around Earth, categorized by inclination, shape and altitude.

Eye anatomy,artwork

Narrowed blood vessel, artwork

Narrowed blood vessel, artwork

Narrowed blood vessel, artwork

Zonation of the ocean. Note that in the littoral zone the water is at the high-tide mark.

Vegetation profile of a grassland.

Cutaway view of a typical construction of a miniature power cell, as in a zinc-silver oxide or zinc-mercuric oxide system.

Types of faulting in tectonic earthquakes.

Internal structure of Mercury, illustration

Internal structure of Mercury, illustration

Internal structure of Earth, illustration

Earth's prebiotic and modern atmosphere

Pay-off matrix showing bourgeois, or mixed attack/retreat behaviour, as the most stable strategy for a population.

A fuel cell (actually a group of cells) has essentially the same kinds of components as a battery.

Muscle structure, artwork

Jupiter's atmosphere

Female reproductive system, artwork

Vegetation profile of a boreal forest. The tree layer consists mainly of conifers, and mosses are the predominant ground cover.

The Apollo program: the Saturn V launch vehicle and configurations of the spacecraft modules at launch and during the journey.

Apollo mission profile for a lunar landing and return, outlining the various stages along the mission.

Viral transfer of bacterial DNA, artwork

U.S. space shuttle, composed of a winged orbiter, an external liquid-propellant tank, and two solid-fuel rocket boosters.

The two sensory organs of balance: the cristae of the semicircular ducts and the maculae of the utricle and saccule.

Laser eye surgery, artwork

Laser eye surgery, artwork

Female urinary system, artwork

Asthma pathology, artwork

Breast anatomy, artwork

A cutaway view shows how light passes through the lenses and prisms of binoculars.

Comparison of a normal heart to one with a ventricular septal defect

Gyrotron, electrons from the cathode acquire cyclotron rotation in the cavity.

Nickel (hydroxide)-cadmium cell of “jelly roll” construction. This rechargable battery is commonly used in portable devices.

Cutaway view of an alkaline-manganese dioxide power cell.

An internal-combustion engine goes through four strokes: intake, compression, combustion (power), and exhaust.

Typical gasoline engine cooling system.

Generated by an undersea earthquake, a tsunami may propagate over open ocean waters before cresting and inundating a coastline.

The age of Earth's oceanic crust, as measured in millions of years.

Healthy female figure, artwork

Healthy female figure, artwork

Female reproductive system, artwork

Male Down's syndrome karyotype, artwork

Human stomach, artwork

Human olfactory system, artwork

Liver and pancreas, artwork

Dupuytren's contracture,artwork

Kidney stone, artwork

Tear production, artwork

Situs inversus, artwork

Brain and spinal cord, artwork

Shoulder muscles, artwork

Anatomical terms, artwork

Anatomical planes of the body, artwork

Male anatomy, artwork

Male anatomy, artwork

Animal cell structure

Cardiovascular system, artwork

Collateral circulation, artwork

Narrowed coronary artery, artwork

Shoulder bones, artwork

Coriolis force

Compton effect

The gasoline carburetor is a device that introduces fuel into the airstream as it flows into the engine.

A grid-connected solar cell system.

The sequence of events in a four-stroke diesel engine involves a single intake valve, fuel-injection nozzle, and exhaust valve.

Valley and mountain breezes

An electron (e) in a solar cell interacting with light and dissipating excess energy is analogous to a child playing on a slide.

Osteoarthritis of the knee, artwork

Correct computer use position, artwork

Gender characteristics, artwork

Protein synthesis, artwork

Gate control theory of pain, artwork

Polar covalent bond

Cardiac stress test, artwork

Height of space from Earth, illustration

The relationship between hot springs and epithermal veins.

Artist's impression of the Oort Cloud

Heart conduction system, artwork

Displacements in the Earth in four types of free vibrations.

Acne, artwork

Ascites, artwork

Asthma inhaler use, artwork

Draining ascites, artwork

足つぼ名称図解

足つぼ名称図解

足つぼ図解

足つぼ図解

足つぼ名称図解

足つぼ名称図解

足つぼ名称図解

足つぼ図解

足つぼ図解

足つぼ名称図解

The four strokes of a four-stroke cycle engine - intake, compression, power, and exhaust. Only the intake stroke delivers power.

Solar cells, whether used in a central power station, a satellite, or a calculator, have the same basic structure.

Typical gasoline engine lubrication system.

Proton exchange membrane (PEM) fuel cell.

Male urinary system, artwork

Heart, artwork

Heart, artwork

Mechanism of enzyme action, illustration

Human olfactory region, artwork

Cervical conization, artwork

Kidney anatomy, artwork

Cross-section showing component parts of arteries and veins

Seasons change because more direct sunlight falls on some parts of Earth than others at different times of the year.

Weathering frees heavy minerals from their matrix, washing them down slope where flowing water forms them into placer deposits.

Height of space from Earth, illustration