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A Novel Ex Ovo Banding Technique to Alter Intracardiac Hemodynamics in an Embryonic Chicken System

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COAGULATION IN EMBRYONIC BLOOD.

V E Emmel¹, S A Levinson, M E Fisch

¹Department of Anatomy of the University of California Medical School, Berkeley, and the Department of Anatomy of the University of Illinois College of Medicine, Chicago.

The Journal of Experimental Medicine

|October 30, 2009

Summary

This summary is machine-generated.

Pig embryo blood coagulates significantly slower than adult blood due to bile presence. Adding bile to adult blood mimics this effect, identifying bile as the primary factor in delayed embryonic blood coagulation.

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Area of Science:

Hematology
Embryology
Biochemistry

Background:

Embryonic blood exhibits a significantly prolonged coagulation time compared to adult blood.
Understanding the factors influencing embryonic blood coagulation is crucial for developmental biology and hemostasis research.

Purpose of the Study:

To investigate the causes of the extended coagulation time observed in pig embryonic blood.
To identify specific factors within embryonic blood that contribute to delayed clot formation.

Main Methods:

Comparative analysis of coagulation times between embryonic and adult pig blood.
Experimental manipulation by adding platelet material, calcium chloride, and tissue extract to embryonic blood.
Chemical analysis to determine calcium and fibrinogen content, and presence of bile.

Main Results:

Embryonic pig blood showed a coagulation time 6-8 times longer than adult blood.
Platelet count was similar, but addition of adult platelets shortened coagulation time.
Presence of bile in embryonic blood was confirmed and shown to significantly delay coagulation, mimicking embryonic conditions when added to adult blood.

Conclusions:

Bile in embryonic blood is the primary factor responsible for its prolonged coagulation time.
Calcium in embryonic blood is likely in a bound form, with bile interfering with free calcium ion availability.
Embryonic blood coagulation may involve a slow release of tissue substances that neutralize bile and liberate calcium.