Blood Vessels In Presence Research Articles

A Study on Testicular Development in Apteronotus albifrons

Apteronotus albifrons has its cloacal aperture located in the front of the body and on the back of the lower jaw. A. albifrons possess a pair of testes attached on the mesentery below its liver on the back of the abdominal cavity. In the early days of development, the testes are in translucent elongated thin strips in nude colour. As they develop, the testes will grow thicker and become white or creamy white in color. The rear end of the testes will split whereas the front end will merge to form the vas deferens which is connected to the external environment through the cloacal aperture. Testes of A. albifrons are lobular. There are six stages in its development. At 6 months of age, the testis structure shows clear medium with primary spermatocytes and abundant spermatogonia, suggesting that development is into the stageⅡ. At 8 months of age, testes in male A. albifrons are in the shape of a thin rod in white with blood vessels in presence. Germ cells consist of spermatogonia, primary spermatocytes and spermatocytes, indicating stageⅢ development. At 11 months of age, testes in male A. albifrons grow fuller and are in creamy white with apparent blood vessels present. Primary spermatocytes, secondary spermatocytes, spermatids and a small amount of sperms are president, indicating stageⅣ of development. At 15 months of age, testes in male A. albifrons swells and consist of a large amount of sperms, reaching full maturity. This is the stageⅥof development, after which is the stage featured by testes after spermiation.

A Mathematical Model of Blood Flow in Narrow Blood Vessels in Presence of Magnetic Field

This paper discuss the biomagnetic fluid aspect of blood flow through narrow tubes with mild stenosis. The blood flow in narrow arteries is treated as two-fluid model with non-Newtonian Jeffrey fluid in the core region and in peripheral region as Newtonian fluid. An analytical solution is obtained for the velocity, volume flow rate, and wall shear stress. The effect of Hartmann number, Jeffrey fluid parameter, shape and size of the stenosis on the velocity, volume flow rate and wall shear stress is discussed.