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Home > All Images > 2003 > March > 28 Mar 2003

Images Dated 28th March 2003

Choose from 40 pictures in our Images Dated 28th March 2003 collection for your Wall Art or Photo Gift. All professionally made for Quick Shipping.


Beluga whale bull Featured 28 Mar 2003 Image

Beluga whale bull

Beluga whale (or white whale, Delphinapterus leucas) bull. In summer, belugas migrate into river estuaries, where they moult. The whale's yellowish skin colour in this picture is typical of moulting adults. Belugas are normally a creamy white. Their skin is 100 times thicker than a human's, mainly for insulation. To encourage shedding of the old skin, they roll on the river bottom to rub against rocks and mud. Belugas inhabit the Arctic coastal waters of Europe, Asia and North America. They live in pods (groups) of 20-200. They dive to the seabed to feed on bottom- dwelling fish and invertebrates. Photographed in July in Cunningham Inlet, Canadian Arctic

© DOUG ALLAN/SCIENCE PHOTO LIBRARY

False-col SEM of Penicillium chrysogenum Featured 28 Mar 2003 Image

False-col SEM of Penicillium chrysogenum

False-colour scanning electron micrograph (SEM) of Penicillium chrysogenum, the species of penicillin fungus from which the antibiotic is manufactured. The micrograph shows a close-up of the fungal spores, or conidia. The conidia are in fact green in colour, which is why mouldy cheese often looks green. The slightest movement of air causes the conidia to be detached & blown away. Penicillium species are the most widespread moulds, & the air is full of their conidia. It was the chance arrival of a spore of P. notatum on a bacterial plate that led to Alexander Fleming's discovery of penicillin as an antibiotic. Magnification: x2850 at 35mm size

© DR JEREMY BURGESS/SCIENCE PHOTO LIBRARY

Stoma on sepal of primula flower Featured 28 Mar 2003 Image

Stoma on sepal of primula flower

False-colour scanning electron micrograph of a stoma, or pore, on a sepal of the primula flower, Primula malacoides. The stoma appears to be open, but is in fact closed, its inner walls tightly pressed together. Stomata open & close to allow the exchange of gases between plant & atmosphere. Each stoma consists of two "guard cells" which control the movement of the pore. The changing shape of the pore is due to the amount of water present in the guard cells. Stomata are most abundant in leaves, where the intake of carbon dioxide through these pores is essential during photosynthesis. Magnification: x500 at 6x4.5cm size. Yellow & green full colouring. Reference: MICROCOSMOS, figure 4.12, page 73

© DR JEREMY BURGESS/SCIENCE PHOTO LIBRARY