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Home > All Images > 2004 > April > 21 Apr 2004

Images Dated 21st April 2004

Choose from 99 pictures in our Images Dated 21st April 2004 collection for your Wall Art or Photo Gift. All professionally made for Quick Shipping.


Stress patterns in geometry instruments Featured 21 Apr 2004 Image

Stress patterns in geometry instruments

Stress patterns in plastic geometry instrumentsrevealed by photopolarimetry. When plastic objectsare manufactured, internal stresses may build up.These stresses are induced both at the time thatthe object is pressed and by differential cooling.Areas under different stresses rotate polarisedlight by different amounts. By placing the objectbetween two crossed polarising filters, the stresspatterns show as various colours. An individualshade of each colour represents a discrete levelof stress. The birefringence patterns, as they arecalled, may be used to predict stresses in largestructures by applying suitable forces to a scalemodel, e.g. of a bridge component

© Sheila Terry/Science Photo Library

Fashion 1980s Model wearing a cotton blouse with white linen jodhpurs Featured 21 Apr 2004 Image

Fashion 1980s Model wearing a cotton blouse with white linen jodhpurs

Fashion 1980s
Model wearing a cotton blouse with white linen jodhpurs and a khaki linen bush-jacket with a wide brimmed hat and black lace-up shoes, holding a cane leaning on the back of a chair
Designed by Ralph Lauren
February 1984

© Mirrorpix

1980s Fashion, Clothing, Fashion, Hats, Model, Style, Women

Robot picking bacteria containing human DNA Featured 21 Apr 2004 Image

Robot picking bacteria containing human DNA

Human genome research. Robot picker (upper centre) as it selects bacterial colonies in petri dishes which contain human DNA for the Human Genome Project. The colonies are seen as white dots in agar nutrient medium here. Human DNA is placed in bacteria so that they clone (replicate) it as they reproduce. This is to increase the amount of DNA to workable amounts. The human genome project aims to find the DNA (deoxyribonucleic acid) base sequence of all human genes. This will allow for improved drug design and a greater understanding of genetic diseases. Photographed at the Sanger Centre in Cambridge, England

© DAVID PARKER/SCIENCE PHOTO LIBRARY