The complement fixation test is one of the most established serology methods. This relies on the formation of specific antibody-antigen complex that activate the complement system. ...

Antibodies directed against antigens on the surface of red cells cause cross linking so that the cells form a mat instead of a tight button as they fall to the bottom of a microtitre ...

Precipitation Curve (Prozone and Postzone) On either side of the equivalence zone, precipitation is actually prevented because of an excess of either antigen or antibody. In the case ...

Cytomegalovirus (CMV): Renal tubular cells in neonate with congenital CMV infection show prominent nuclear inclusions resembling owls’ eyes.

Giardia lamblia trophozoite has a classic pear shape, with double nuclei givig an “owl’s eye” appearance References: CDC

Gram stain shows multiple gram-negative diplococci within polymorphonuclear leukocytes as well as in the extracellular areas of a smear from urethral discharge   References: http://www.fpnotebook.com http://wwnorton.com  

Mycobacterium tuberculosis organisms are identified by their red color on acid-fast staining (Ziehl–Neelsen stain)   The granulomas of tuberculosis tend to contain necrosis ...

Streptococcus pneumoniae in sputum sample from patient with pneumonia, showing gram positive diplococci

Propionibacterium is facilitative gram positive rods, and named like this because of their ability to synthesize  propionic acid Propionibacterium live in skin, sweat gland and ...

Aeromonas is gram negative rods, facultative anaerobic seen in soil and fresh and brackish water and it causes infections in both Human and Animals mostly fishes The most important ...

For selective isolation of yeasts and direct identification of Candida albicans Candida albicans colonies are coloured blue by the specific hydrolysis of a hexosaminidase chromogenic ...

old E.coli culture stained with DNA dyes Propidium Iodine which is not membrane permeable (stains dead/broken cells) and Syto9 which is membrane permeable and will thus stain all ...