Posts tagged bacteria


Science photography: Streptococcus pneumoniae bacteria
Streptococcus pneumoniae, coloured scanning electron micrograph (SEM). S. pneumoniae are oval, Gram-positive bacteria. They are part of the normal human bacterial flora and are carried by many without causing infection. However, in individuals with compromised immune systems, they can infect the upper respiratory tract, causing pneumonia. They may also infect other parts of the body, causing bacterial blood poisoning (bacteraemia) and meningitis. Magnification: x16,000 when printed at 10 centimetres wide.

Science photography: Streptococcus pneumoniae bacteria

Streptococcus pneumoniae, coloured scanning electron micrograph (SEM). S. pneumoniae are oval, Gram-positive bacteria. They are part of the normal human bacterial flora and are carried by many without causing infection. However, in individuals with compromised immune systems, they can infect the upper respiratory tract, causing pneumonia. They may also infect other parts of the body, causing bacterial blood poisoning (bacteraemia) and meningitis. Magnification: x16,000 when printed at 10 centimetres wide.

Science photography: Blood cells
Coloured scanning electron micrograph (SEM) of red blood cells (erythrocytes) and a white blood cell (leucocyte, pink, upper centre). Red blood cells are biconcave, disc-shaped cells that transport oxygen from the lungs to body cells. They circulate around the body in the blood and also remove carbon dioxide to the lungs for exhalation. Their red colour comes from the oxygen-carrying protein haemoglobin. Red blood cells are the most abundant cell in the blood. They have no nucleus and are about 7 micrometres in diameter. White blood cells perform functions ranging from cleaning up cellular debris, to defending the body against bacteria and other pathogens.

Science photography: Blood cells

Coloured scanning electron micrograph (SEM) of red blood cells (erythrocytes) and a white blood cell (leucocyte, pink, upper centre). Red blood cells are biconcave, disc-shaped cells that transport oxygen from the lungs to body cells. They circulate around the body in the blood and also remove carbon dioxide to the lungs for exhalation. Their red colour comes from the oxygen-carrying protein haemoglobin. Red blood cells are the most abundant cell in the blood. They have no nucleus and are about 7 micrometres in diameter. White blood cells perform functions ranging from cleaning up cellular debris, to defending the body against bacteria and other pathogens.

Science: Shigella dysenteriae bacteria. 
Coloured scanning electron micrograph (SEM) of Shigella dysenteriae bacteria, the cause of dysentery in humans. Several of the rod-shaped, non-motile, Gram- negative bacterial cells can be seen. Dysentery affects mainly the large intestine and varies in severity from a mild attack of diarrhoea to an acute infection. Until the introduction of sulphonamide drugs in the 1930s it was a world- wide killer disease. It still affects the young, elderly and malnourished. Infection is spread by flies, direct contact, and water contaminated by faeces containing the bacillus. Magnification: x14,600 at 6x7cm size

Science: Shigella dysenteriae bacteria.

Coloured scanning electron micrograph (SEM) of Shigella dysenteriae bacteria, the cause of dysentery in humans. Several of the rod-shaped, non-motile, Gram- negative bacterial cells can be seen. Dysentery affects mainly the large intestine and varies in severity from a mild attack of diarrhoea to an acute infection. Until the introduction of sulphonamide drugs in the 1930s it was a world- wide killer disease. It still affects the young, elderly and malnourished. Infection is spread by flies, direct contact, and water contaminated by faeces containing the bacillus. Magnification: x14,600 at 6x7cm size