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Choose from 47 pictures in our Graphics and Patterns collection for your Wall Art or Photo Gift. All professionally made for Quick Shipping.

Electron flow Featured Graphics and Patterns Print

Electron flow

Electron flow. Computer model representing the flow of electrons through a two-dimensional electron gas (2DEG). The gas is composed of many free electrons, which can move around in only one plane. The 2DEG possesses an electric potential. Irregularities in this potential produce a bumpy surface. The model shows the paths taken by electrons released one at a time into the gas. The negatively-charged electrons were deflected by the bumps in the gas, producing a branching pattern, with the greatest density of electrons represented by the darkest areas. The electron flow was modelled by Professor Eric Heller, Harvard University, Cambridge, Massachusetts, USA

© Eric Heller/Science Photo Library

Compound eye of a gnat, SEM Featured Graphics and Patterns Print

Compound eye of a gnat, SEM

Compound eye. Coloured scanning electron micrograph (SEM) of the surface of a compound eye from a fungus gnat (family Sciaridae). The eye consists of many rounded lenses known as ommatidia. Each ommatidium is a simple eye that sends a signal to the gnat's brain. All the signals are combined by the brain to form a mosaic view of the world. The image seen is not very sharp but good at detecting movements. Between the lenses are hair-like structures called interommatidial bristles. Magnification: x850 when printed at 10 centimetres wide


Dry river beds, satellite image Featured Graphics and Patterns Print

Dry river beds, satellite image

Dry river beds, satellite image. North is at top. The bright blue areas are meandering wadis (dry river beds) that have formed in this desert area due to flooding. Desert areas can go for years without rain, and then be flooded by large storms. The floodwaters briefly carve patterns in the landscape and then evaporate or sink into the soil. The bright blue areas have higher moisture content than the surrounding areas. This area is in eastern Jordan, near the Syrian border. The area shown in this image is around 60 kilometres wide. The image data includes infrared wavelengths, and was obtained on 17 May 2001, using the ASTER sensor on the Terra satellite