Red Blood Cells under microscope.
This video shows the features of the red blood cells. Since it contains strong cytoskeleton, it can resist pressure. However, when these blood cell are put into high salt environment, they begin losing water so its structure collapses.
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red blood
Added: March 16, 2007, 9:12 pm
Runtime: 55.50 | Views: 23844 |
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Visualization of tRNA Movements on 70S Ribosome
ribosome ratchet
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ribosome ratchet
Added: March 14, 2007, 12:07 am
Runtime: 56.50 | Views: 13018 |
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Lac operon mechanism
The lac operon is an operon required for the transport and metabolism of lactose in Escherichia coli and some other enteric bacteria. It consists of three adjacent structural genes, a promoter, a terminator, and an operator. The lac operon is regulated by several factors including the availability of glucose and of lactose. Gene regulation of the lac operon was the first genetic regulatory mechanism to be elucidated and is often used as the canonical example of prokaryotic gene regulation.
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DEAS
Added: March 17, 2007, 2:28 am
Runtime: 151.48 | Views: 53361 |
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Keratocyte Dance - Cool video
This is cool video showing the keratocyte cells. Keratocyte are fibroblastic stromal cell of the cornea. Keratocytes produce keratan-sulfate proteoglycans (KSPG), lumican and keratocan to form and sustain proper collagen interfibrillar spacing and fibril diameter of the cornea.
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keratocyte
Added: March 17, 2007, 2:42 am
Runtime: 125.70 | Views: 8943 |
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Development of egg cells
This video show the development of egg cells.
In animals, one can usually distinguish 4 stages of embryonic development.
1.Cleavage
2.Patterning
3.Differentiation
4.Grow
ClEAVAGE
Mitosis and cytokinesis of the zygote, an unusually large cell, produces an increasing number of smaller cells, each with an exact copy of the genome present in the zygote. However, the genes of the zygote are not expressed at first. The activities of cleavage are controlled by the mother\'s genome; that is, by mRNAs and proteins she deposited in the unfertilized egg. Cleavage ends with the formation of a blastula.
PATTERNING
During this phase, the cells produced by cleavage organize themselves in layers and masses, a process called gastrulation. The pattern of the future animal appears:
front and rear (the anterior-posterior axis)
back side and belly side (its dorsal-ventral axis)left and right sides.
There is little visible differentiation of the cells in the various layers, but probes for cell-specific proteins reveal that different groups of cells have already started on specific paths of future development.
Ref: http://users.rcn.com/jkimball.ma.ultranet/BiologyPages/E/EmbryonicDevelopment.html
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development egg cell cleavage
Added: March 17, 2007, 11:23 pm
Runtime: 87.30 | Views: 27552 |
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