When blood vessels are cut or damaged, the loss of blood from the system must be stopped before shock and possible death occur. This is accomplished by solidification of the blood, a process called coagulation or clotting.
A blood clot consists of
- a plug of platelets enmeshed in a
- network of insoluble fibrin molecules.
Platelet aggregation and fibrin formation both require the proteolytic enzyme
thrombin.
Clotting also requires:
- calcium ions (Ca2+)(which is why blood banks use a chelating agent to bind the calcium in donated blood so the blood will not clot in the bag).
- about a dozen other protein clotting factors. Most of
these circulate in the blood as inactive precursors. They are activated
by proteolytic cleavage becoming, in turn, active proteases for other factors in the system.
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It is a tough question..
In business , it should be business strictly..
An Engineer shud act like an Engineer
A Doctor should act like a doctor
A diplomat is a diplomat
so professional achievement is different from personal achievementou
Some times you can always make mistakes judging people..
In life you value always your blood relatives at any circumstances..and true friends..and well wishers..
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It is a large (10-20 ?m diameter) amoeboid and phagocytic cell found in many tissues, especially in areas of inflammation, derived from blood monocytes and playing an important role in host defense mechanisms.
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It is decrease in the number of blood platelets (thrombocytes).
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Totipotency is the ability of a single cell to divide and produce all the differentiated cells in an organism,
including extraembryonic tissues. Totipotent cells formed during sexual and asexual reproduction include spores and zygotes.the definition of pluripotency has come to refer to a stem cell that has the potential to differentiate into any of the three germ layers: endoderm (interior stomach lining, gastrointestinal tract, the lungs), mesoderm (muscle, bone, blood, urogenital), or ectoderm (epidermal tissues and nervous system). Pluripotent stem cells can give rise to any fetal or adult cell type. However, alone they cannot develop into a fetal or adult animal because they lack the potential to contribute to extraembryonic tissue, such as the placenta.
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Thursday, March 20, 2008
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In RFLP analysis, the DNA of an organism is cut up into fragments using restriction enzymes. A large number of short fragments of DNA will be produced.
Restriction enzymes always cut at the same base sequence.
Because no two individuals have identical DNA, no two individuals will have the same length fragments. For
example, the enzyme EcoRI always cuts DNA at the sequence GAATTC.
Different people have different numbers of this particular sequence and will therefore have different fragment
lengths. some of them will be at different locations on the chromosome.
DNA were placed on the gelatin.
The DNA bands must be stained to make them visible.
Ethidium bromide-stained DNA will fluoresce when illuminated with UV light.
PCR techniques are used to produce sufficient quantities of DNA for this technique.
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