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Ross Operation : In this technically demanding operation, the aortic valve is replaced by patient's own pulmonary valve (autograft) and a pulmonary or aortic allograft (homograft) is used for replacing the pulmonary valve. The advantage of this operation is that the autograft in the high-pressure aortic position will last indefinitely. The homograft in the low-pressure pulmonary position, where even if it fails after long time, regurgitation is better tolerated.
The operation is done under cardio pulmonary bypass, using two venous cannulae and a single ascending aortic cannula.
Skeleton - Animal Kingdom You all know that the skeleton forms the framework of the body of different organisms in the animal kingdom. Besides giving shape to the animal, it a
Q. Can you explain Deoxynivalenol Mycotoxicosis? During 1987, an outbreak estimated to have affected over 50,000 people in the State of Jammu and Kashmir, was traced to the c
What are examples of nematodes? Ascaris, hookworm and filaria, all parasites of humans, are instance of nematodes (also called as roundworms).
Pollen Tube Structure The pollen tube in the stigma is filled with cytoplasm containing numerous mitochondria and dictyosomes. The number of dictyosome cisternae is reduced i
What is deplasmolysis of plant cells? The plant cell when placed under hypertonic medium loses a huge amount of water and its cell membrane detaches from the cell wall. In that
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Fine Structure of Pollen Tubes Grown in Vitro The growth in pollen tubes is exclusively restricted to the tip. Cytochemical analysis reveals the pollen tip zone to be rich in
Ecological adaptation in animals to aquatic environment In the aquatic environment animals are confronted with the problem of excess water. Freshwater and marine animals try to
what is a seed?
Q. Function of Adenosine in consciousness? The adenosine plays a major role in inducing sleep. Injections of adenosine promote sleep and decrease wakefulness. Conversely, adeno
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