|The hematic system is composed of blood and the vessels that carry the blood throughout the body The solid portion of blood is composed of three different types of cells: Erythrocytes - also called red blood cells (RBCs),they have the important function of transport Oxygen and Carbondioxide throughout the body. The vehicle for this transportation is a protein-iron pigment called hemoglobin. Leukocytes - also called white blood cells (ABCs) ,they protect the body against microorganism, further sub classification is of two main types of WBCs: granulocytes(Eosinophils, Neutrophils, Basophils) and agranulocytes (Monocytes and lymphocytes) Thrombocytes - also called clotting cells, cell fragments, or platelets.
The impact factor of journal provides quantitative assessment tool for grading, evaluating, sorting and comparing journals of similar kind. It reflects the average number of citations to recent articles published in science and social science journals in a particular year or period, and is frequently used as a proxy for the relative importance of a journal within its field. It is first devised by Eugene Garfield, the founder of the Institute for Scientific Information. The impact factor of a journal is evaluated by dividing the number of current year citations to the source items published in that journal during the previous two years.