27.3 MB (1.9 MB compressed)
3552 x 2686 pixels
30.0 x 22.9 cm ⏐ 11.8 x 9.0 in (300dpi)
ROSENFELD IMAGES LTD / SCIENCE PHOTO LIBRARY ROSENFELD IMAGES LTD / SCIENCE PHOTO LIBRARY
Yoghurt manufacture. Technician attending to factory equipment used to make thermally treated yoghurt. Yoghurt is made by adding a bacterial culture of Lactobacillus acidophilus and Streptococcus thermophilus to milk. The bacteria are introduced to a fresh batch of concentrated milk by adding a portion of a previous batch. Thermally treated yoghurt is then pasteurised to kill the culture and improve the product's storage life. Yoghurt is widely consumed as a health food.
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