The onset and retreat of the West African monsoon with respect to the timing of the direct rays of the sun.
Horizontal divergence and convergence patterns associated with the polar-front jet.
General patterns of atmospheric circulation over an idealized Earth with a uniform surface and the actual Earth.
Diagram of a wave system depicting typical divergence and convergence distributions for non-tilting and tilting systems.
The stages in the evolution of a wave (frontal) cyclone.
Changes in ion permeance underlying the action potential.
The process of cell division by mitosis.
Human arterial supply and venous drainage of the organs.
The diffusion of water across a semipermeable membrane.
The endoplasmic reticulum plays an important role in the biosynthesis, processing, and transport of proteins and lipids.
Evolutionary history of the globin genes. The dots indicate the duplication of ancestral genes, giving rise to new gene lineage.
Differentiation of the external genitalia in the human embryo and fetus.
The components of a scanning electron microscope (SEM).
The diffusion of potassium cations across a semipermeable membrane.
Diagram depicting the process of atoll formation. Atolls are formed from the remnant parts of sinking volcanic islands.
Stages in the process of meiosis, cell division among sexually reproducing organisms.
The surface reflectance differences between a pre-agricultural (forest) and a modern agricultural (patchwork heating) landscape.
Annual temperature and precipitation patterns for several locations with different climatic conditions.
Receptor-mediated endocytosis enables cells to ingest molecules such as protein that are necessary for normal cell functioning.
Transverse section of an artery.
Two types of pressure gauge: the U-tube manometer and the Bourdon-tube gauge.
Theoretical depiction of the movement of tectonic plates across Earth's surface.
Diagram of a human uterus during the fourth month of pregnancy.
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.
Average exchange of energy between the surface, atmosphere, and space, as percentages of incident solar radiation.
Phylogeny based on differences in the protein sequence of cytochrome c in organisms ranging from Neurospora mold to humans.
In Ptolemy's geocentric model of the universe, the Sun, Moon, and each planet orbit a stationary Earth.
Approaching the speed of light, an object appears shorter, with a longer time interval, relative to its intervals when at rest.
The weather model of meteorologist Edward Lorenz.
Diagram of a mammalian muscle spindle.
Light waves matching the orientation of the molecules of a polarizing filter are absorbed, reducing the intensity of the light.
The artery wall and the ultrastructure of the smooth muscle cells within it.
The components of a transmission electron microscope (TEM).
The steps involved in the engineering of a recombinant DNA molecule.
Theoretical diagram showing the effects of an advancing tectonic plate on other adjacent, but stationary, tectonic plates.
Uniformly accelerated motion; s = speed, a = acceleration, t = time, and v = velocity.
Diagram of an artificial pacemaker
Annual circulation patterns in a dimictic lake: stratification in the summer and complete overturn in the autumn and spring.
Seasons change because more direct sunlight falls on some parts of Earth than others at different times of the year.
Thermonuclear warhead
Automotive-type lead-acid battery, a storage battery that holds its charge for a long time and can be recharged.
The 4-D space-time continuum is distorted in the vicinity of any mass, depending on the mass and the distance from the mass.
Earth's prebiotic and modern atmosphere
Blood alcohol concentration
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.
Diagram showing a healthy heart valve compared with a diseased heart valve and an artificial heart valve.
Diagram demonstrating the difference between a normal heart and a heart with an atrial septal defect
Pay-off matrix showing bourgeois, or mixed attack/retreat behaviour, as the most stable strategy for a population.
Fission bomb designs
Electron shell
Basic components of an electrochemical cell.
Cross section of a V-type engine.
Coriolis force
Compton effect
The analysis of sound frequencies by the basilar membrane.
The journey of the Galileo spacecraft to Jupiter, highlighting major observations along the trajectory, as well as their dates.
Schematic drawing of the structure of a typical bacterial cell of the bacillus type.
The Hardy-Weinberg Law applied to two alleles.
Elements of the traveling-wave tube (TWT), used to amplify microwave signals over broad bandwidths.
Modern version of the Leclanche cell. This heavy-duty zinc-carbon primary battery is a dry cell with an immobilized electrolyte.
Space station Mir, after its completion in 1996, with the launch dates of each modular component shown.
Pluto and the Kuiper belt
U.S. space station Skylab (occupied 1973-74), shown with docked Apollo Command and Service modules.
Four main types of estuaries: A) salt wedge estuary, B) partially mixed estuary, C) vertically homogeneous estuary, D) fjord.
Rising air in an unstable atmosphere
Vegetation profile of a temperate deciduous forest.
Vegetation profile of a desert.
Vegetation profile of tropical mountain lands.
Cross section of a typical bomb calorimeter.
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.
Blower-scavenged, two-stroke-cycle engine with uniflow scavenging, displaying both upstroke and downstroke.
A tokamak is a toroidal magnetic confinement system used as a method of achieving fusion energy.
Diesel engine equipped with a precombustion chamber.
Georges Leclanche's dry cell and its later variations, zinc chloride and alkaline cells, are batteries commonly used worldwide.
Seismic ray types in Earth's interior from earthquake at F.
Basic characteristics of orbits in which a satellite can be placed around Earth, categorized by inclination, shape and altitude.
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.
Vegetation profile of a boreal forest. The tree layer consists mainly of conifers, and mosses are the predominant ground cover.
An internal-combustion engine goes through four strokes: intake, compression, combustion (power), and exhaust.
Cross section comparing the left ventricular wall of normal heart to a left ventricular wall that has experienced hypertrophy.
Cross section of a crystal microphone.
Relationships of endocrine glands, from the pituitary-hypothalamus system to the vertebrate endocrine glands and their hormones.
The two sensory organs of balance: the cristae of the semicircular ducts and the maculae of the utricle and saccule.
Zonation of the ocean. Note that in the littoral zone the water is at the high-tide mark.
The gasoline carburetor is a device that introduces fuel into the airstream as it flows into the engine.
A fuel cell (actually a group of cells) has essentially the same kinds of components as a battery.
The sequence of events in a four-stroke diesel engine involves a single intake valve, fuel-injection nozzle, and exhaust valve.
Electrical conduction in the heart in healthy individuals is controlled by pacemaker cells in the sinoatrial node.
Four types of gasoline engines: opposed-piston engine, rotary engine, in-line engine, and V-type engine.
Bohr atomic model
Polar covalent bond
Ionic bond
The mechanical components of a compound microscope.
A cross section of Earth's outer layers, from the crust through the lower mantle.
Image formation in a microscope, according to the Abbe theory.
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.
A grid-connected solar cell system.
Types of faulting in tectonic earthquakes.
Displacements in the Earth in four types of free vibrations.
Gyrotron, electrons from the cathode acquire cyclotron rotation in the cavity.
The four strokes of a four-stroke cycle engine - intake, compression, power, and exhaust. Only the intake stroke delivers power.
A cutaway view shows how light passes through the lenses and prisms of binoculars.
Solar cells, whether used in a central power station, a satellite, or a calculator, have the same basic structure.
Moon interior
Asteroid distribution
Venus's middle and lower atmosphere
Pluto-Charon mutual eclipses
Near-Earth objects
Uranus's orbit
Speedometer
Spring balance
Nuclear blast and radiation effects
Anatomical planes of the body, artwork
Female reproductive system, artwork
Gender characteristics, artwork
Muscle structure, artwork
Protein synthesis, artwork
Gate control theory of pain, artwork
Height of space from Earth, illustration
Cardiac stress test, artwork
Osteoarthritis of the knee, artwork
The age of Earth's oceanic crust, as measured in millions of years.
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 relationship between hot springs and epithermal veins.
Comparison of a normal heart to one with a ventricular septal defect
An electron (e) in a solar cell interacting with light and dissipating excess energy is analogous to a child playing on a slide.
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.
Typical gasoline engine cooling system.
Typical gasoline engine lubrication system.
Proton exchange membrane (PEM) fuel cell.
Generated by an undersea earthquake, a tsunami may propagate over open ocean waters before cresting and inundating a coastline.
Glycolysis, the dissolution of sugar, is carried out in the cytoplasm of cells.
Jupiter's atmosphere
Valley and mountain breezes
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
Eye anatomy,artwork
Narrowed blood vessel, artwork
Anatomical terms, artwork
Male anatomy, artwork
Animal cell structure
Healthy female figure, artwork
Cardiovascular system, artwork
Collateral circulation, artwork
Narrowed coronary artery, artwork
Shoulder bones, artwork
Internal structure of Mercury, illustration
Internal structure of Earth, illustration
When monochromatic light passes through two narrow slits to illuminate a screen, it creates a pattern of bright and dark bands.
When monochromatic light passing through a single slit illuminates a screen, a characteristic diffraction pattern is observed.
Genetic differentiation between populations of Drosophila willistoni.
The first reduction for an n-person voting game theory, illustrating the strategies least suitable for each participant.
Pythagorean theorem, illustration
Wormhole through hyperspace, artwork
Operating principle of a parallel-flow heat exchanger.
Acne, artwork
Ascites, artwork
Asthma inhaler use, artwork
Draining ascites, artwork
Obtaining approximate measurements through the use of differentiation and integration.
Part of the elliptic paraboloid z = x2 + y2 which can be generated by rotating the parabola z = x2 (or z = y2) about the z-axis.
Artist's impression of the Oort Cloud
足つぼ名称図解
足つぼ図解
Mechanism of enzyme action, illustration
Laser eye surgery, artwork