BioScience Dictionary

A | B | C | D | E | F | G | H | I | J | K | L | M | N | O | P | Q | R | S | T | U | V | W | X | Y | Z | Ot.

Found Platelet 23 times.

Displaying results 1 to 10.

1. Bleeding time
This is the time for the bleeding to stop from an artificially made superficial incision on the forearm. The mechanism to stop bleeding involves vascular contraction, platelet function, and the participation of the non-clotting portion of the Factor VIII. Bleeding time may be normal in disorders of the coagulation system. Normal range is 1 to 8 minutes. Bleeding time is elevated in the following conditions: * decreased platelet count * decreased platelet function * increased prothrombin time * uremia * DIC * certain drugs: aspirin and other anti-inflammatory drugs

2. Blood clotting factor
Any of a number of different protein factors which, when acting together, can form a blood clot shortly after platelet s have broken at the site of the wound. The factors have Roman numeral names, like VII, VIII, IX, X, XI, and XIII. Defects in the gene s which code for any of these factors result in genetic diseases like hemophilia , which results from a defect in the gene for factor VIII or IX.

3. Blood count
A numerical representation of the number of formed elements, such as red blood cell s or platelet s, found in a cubic millimeter of blood. The number is obtained by counting the cells in an accurate volume of diluted blood.

4. Blood smear
This is the microscopic examination of anticoagulated blood obtained from vein puncture. The characteristics of red cells, white cells, and platelets are observed for their sizes, shapes, numbers, color, morphologies, and the way their group together. Certain presentation of blood smear may suggest disease conditions.

5. Chemokine
A chemokine is a type of cytokine (a soluble molecule that a cell produces to control reactions between other cells) that specifically alters the behavior of leukocyte s (white blood cells). Examples include interleukin 8, platelet factor 4, melanoma growth stimulatory protein, etc.

6. Concanavalin A (con A)
A protein found in the jack beans plant Canavalin ensiformis which sticks various cell types and glycoprotein s (proteins with sugar s attached) to one another by crosslinking them. It can also function much like platelet s in blood do for animals. Also, it encourages mitosis and cell division in dormant lymphocyte s. It is used in the lab technique of affinity chromatography to purify glycoproteins.

7. Cystoblast
A germ cell found in the ovaries of insects which instead of turning into a reproductive cell, becomes the insect equivalent of a platelet (a blood cell which helps bring about blood clots), called a cystocyte .

8. Cystocyte
The insect equivalent of a platelet (a blood cell which helps bring about blood clots). At a site of injury, these cells will break down into threads around which plasma can gel, stopping the flow of hemolymph (the arthropod equivalent of blood) from the site.

9. Deep vein thrombosis (DVT)
Deep vein thrombosis is the formation of a solid mass of platelets in the deep veins of the leg. This process often occurs in patients confined in bed, with sluggish flow of blood in the veins, and traumatized veins. The risk of developing a deep vein thrombosis rises with increasing age.

10. DIC screening test (disseminated intravascular coagulation test)
This is a batch of tests to confirm the clinical diagnosis of disseminated intravascular coagulation (DIC). There is no agreement on what these tests are. In general, the following tests are done, although in many cases one or more of these abnormalities may not be present. prothrombin time-elevated, fibrinogen -decreased, platelet count-decreased, fibrin-fibrinogen degradation products-present, red cell fragments-present

View web definitions »

Learn more about Platelet »