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Prior to donating granulocytes, potential donors must undergo screening and testing procedures. They are required to meet the general criteria for blood donation. [2] Because the granulocyte concentrate also contains red blood cells, the donor's ABO blood type is usually matched to the recipient's.
The Shapley–Sawyer Concentration Class is a classification system on a scale of one to twelve using Roman numerals for globular clusters according to their concentration. The most highly concentrated clusters such as M75 are classified as Class I, with successively diminishing concentrations ranging to Class XII, such as Palomar 12. (The ...
The first known globular cluster, now called M 22, was discovered in 1665 by Abraham Ihle, a German amateur astronomer. [4] [5] [6] The cluster Omega Centauri, easily visible in the southern sky with the naked eye, was known to ancient astronomers like Ptolemy as a star, but was reclassified as a nebula by Edmond Halley in 1677, [7] then finally as a globular cluster in the early 19th century ...
The theme of the 2012 World Blood Donor Day campaign, "Every blood donor is a hero" focuses on the idea that everyone can become a hero by giving blood. Based on data reported by 180 countries between 2011 and 2013, the WHO estimated that approximately 112.5 million units of blood were being collected annually.
CD93 was originally identified in mice as an early B cell marker through the use of AA4.1 monoclonal antibody. [10] [11] Then this molecule was shown to be expressed on an early population of hematopoietic stem cells, which give rise to the entire spectrum of mature cells in the blood.
NGC 6752 (also known as Caldwell 93 and nicknamed the Great Peacock Globular [7]) is a globular cluster in the constellation Pavo. [8] It is the fourth-brightest globular cluster in the sky, after Omega Centauri , 47 Tucanae and Messier 22 , respectively.
Erythrocyte aggregation is the reversible clumping of red blood cells (RBCs) under low shear forces or at stasis. Stacked red blood cells flow across drying slide. Erythrocytes aggregate in a special way, forming rouleaux. Rouleaux are stacks of erythrocytes which form because of the unique discoid shape of the cells in vertebrate body. The ...
NGC 6401 is a very old cluster with an estimated age of 13.2 ± 1.2 Gyr, [4] but has not undergone core collapse. [8] It has a cluster radius of 2.4′. [7] 23 class ab and 11 class c RR Lyrae variables have been identified within a cluster radius of the core. From this, it is deduced that this is an Oosterhoff type I (Oo I) cluster. [7]