Title
: Nostoc
Magnification : 100x
Image : nostocx100.jpg
Keywords : Nostoc, bacteria, monera, cyanobacteria,
heterocyst
Text : Nostoc is a photosynthetic cyanobacteria. The cells are joined end-to-end to form a colony that looks like a string of beads. Some cells form specialized heterocysts that fix nitrogen gas as nitrate.
Click here to see higher magnification. (400x)
Title: Gloeocapsa Magnification : 400x Image : gloeocapsa400.jpg
Keywords : bacteria, cyanobacteria
Text: Gloeocapsa is classified as cyanobacteria, so it is photosynthetic and has chlorophyll a. It has one or more cells surrounded by a capsule. In this image the cells are in groups of four. The higher magnification shows some capsules with only one cell.
Click here to see higher magnification. (450x)
Title: Merismopedia Magnification : 100x Image : merismox100.jpg
Keywords : bacteria, cyanobacteria, merismopedia, colony
Text: This shows a colony of Merismopedia. The cells divide in two dimensions to produce this characteristic flat sheet of cells. Groups of four cells are common, as seen in the high magnification view.
Click here to see higher magnification. (400x)
Title: Spirillum Magnification : 50x Image : spirillum.jpg
Keywords : bacteria, spiral, spirillum
Text: Here you can see the spiral, or corkscrew, shape of the cells of Spirillum. At higher magnification you can see the flagella at each end of the cell, that lets the bacteria swim around.
Click here to see higher magnification. (450x)
Title : Oscillatoria
Magnification : 400x
Image : oscill400.jpg
Keywords : bacteria, colony, prokaryotic
Text : Oscillatoria
is a bacteria that forms long colonies. The cells join together to produce this
thin filament, seen here in black and white. Live Oscillatoria is green
and photosynthetic. Notice that each individual cell is very tiny. These are
prokaryotic cells, that lack a nucleus and lack organelles.
Click here for higher magnification (1000x)
Title: Anabaena Magnification : 100x Image : anabaena.jpg
Keywords : bacteria, cyanobacteria,
anabaena
Text: Anabaena is a photosynthetic cyanobacterium that grows as multicellular filaments. Roughly 10% on the cells are specialized heterocysts that fix nitrogen (the white cell near the center of the high magnification image).
Click here to see higher magnification. (1000x)
Title: Bacillus anthracis
Magnification : 400x
Image
: bacill400.jpg
Keywords : bacteria, bacillus, anthrax
Text: This rod-shaped bacteria grows in long
colonies with the cells joined end-to-end. The shape of the cells is more
apparent under high magnification. This was the first bacterium that was shown
(by Robert Koch in 1877) to be the cause of a disease : anthrax. Anthrax mainly
affects herbivores but occasionally is transmitted to humans. It causes death
fairly rapidly, and could theoretically be used in biological warfare. The
Defense Dept vaccinated troops against anthrax during the Gulf War. The British
government tested an anthrax bomb in 1941 on Gruinard island in Scotland. The
island was finally declared “safe” almost 50 years later in 1990 after the
soil was soaked to a depth of at least 6 inches with formaldehyde to try to kill
any spores that remained.
Click here to see higher magnification. (1000x)
